阅读说明：本技术 用于具有触控显示屏的燃气灶的控制电路及燃气灶 (Control circuit for gas stove with touch display screen and gas stove ) 是由 钱意 万晨 周定冰 于 2020-11-11 设计创作，主要内容包括：本发明提供了一种用于具有触控显示屏的燃气灶的控制电路及燃气灶,燃气灶包括点火机构、火焰检测机构、第一电磁比例阀、第二电磁比例阀、以及截止阀,还包括控制器与触摸显示屏；控制器包括控制中心比例阀控制电路、截止阀控制电路、点火控制电路、火焰检测控制电路和触控显示驱动电路；所述触控显示屏用于获取触控指令,并将所述触控指令发送给所述控制中心；所述控制中心用于根据所述触控指令执行对应控制。本发明能够实现烹饪过程中对燃气火力准确调节,提高菜肴的口感和色泽。(The invention provides a control circuit for a gas stove with a touch display screen and the gas stove, wherein the gas stove comprises an ignition mechanism, a flame detection mechanism, a first electromagnetic proportional valve, a second electromagnetic proportional valve, a stop valve, a controller and the touch display screen; the controller comprises a control center proportional valve control circuit, a stop valve control circuit, an ignition control circuit, a flame detection control circuit and a touch display drive circuit; the touch display screen is used for acquiring a touch instruction and sending the touch instruction to the control center; and the control center is used for executing corresponding control according to the touch instruction. The invention can realize accurate adjustment of gas fire power in the cooking process and improve the taste and color of dishes.)

1. A gas stove comprises a burner, wherein the burner comprises an ignition mechanism, a flame detection mechanism, an inner ring flame path, an outer ring flame path, a first electromagnetic proportional valve communicated with the inner ring flame path, a second electromagnetic proportional valve communicated with the outer ring flame path and a stop valve, and the first electromagnetic proportional valve and the second electromagnetic proportional valve are communicated with a gas supply end through the stop valve; it is characterized in that the preparation method is characterized in that,

the device also comprises a controller and a touch display screen;

the controller comprises a control center, a proportional valve control circuit corresponding to each electromagnetic proportional valve, a stop valve control circuit, an ignition control circuit, a flame detection control circuit and a touch display driving circuit;

the control center is provided with a proportional valve control port, a stop valve control port, an ignition control port, a flame detection port and a touch display port;

each electromagnetic proportional valve is connected with the proportional valve control port through a corresponding proportional valve control circuit, the stop valve is connected with the stop valve control port through a stop valve control circuit, the ignition mechanism is connected with the ignition control port through an ignition control circuit, the flame detection mechanism is connected with the flame detection port through a flame detection control circuit, and the touch display screen is connected with the touch display port through a touch display driving circuit;

the touch display screen is used for acquiring a touch instruction and sending the touch instruction to the control center;

the control center is used for executing corresponding control according to the touch instruction:

if the touch instruction comprises an ignition instruction, the control center controls the stop valve to be opened according to the ignition instruction and controls the ignition mechanism to ignite;

if the touch control instruction comprises a firepower adjusting instruction, the control center determines respective input current values of the first electromagnetic proportional valve and the second electromagnetic proportional valve according to the firepower adjusting instruction, and outputs PWM signals to proportional valve control ports corresponding to the first electromagnetic proportional valve and the second electromagnetic proportional valve based on the respective input current values.

2. The gas stove of claim 1, wherein the proportional valve control circuit comprises an amplifying module, an adjusting module and a feedback module, wherein the adjusting module comprises a triode, a field effect transistor, a voltage stabilizing diode unit and a protective resistance unit;

the two ends of the protection resistance unit are connected with the two ends of the voltage stabilizing diode unit, and are also connected with the source electrode and the grid electrode of the field effect transistor, one end connected with the source electrode is also connected with a first power supply source, and the other end connected with the grid electrode is also connected with the collector electrode of the triode; the drain electrode of the field effect tube is connected with the first end of the electromagnetic proportional valve; the emitter of the triode is connected with the system ground, and the base of the triode is connected with the output end of the amplification module; the amplifying module comprises a comparator, wherein a positive power supply end of the comparator is connected with a second power supply, a negative power supply end of the comparator is connected with the system ground, a positive input end of the comparator is connected with the control port of the electromagnetic proportional valve, and a negative input end of the comparator is connected with the second end of the proportional valve; the feedback module comprises a feedback resistance unit, and two ends of the feedback resistance unit are respectively connected with the second end of the electromagnetic proportional valve and the system ground.

3. The gas range according to claim 2, wherein the zener diode unit comprises a first zener diode and a second zener diode, wherein an anode of the first zener diode is connected to an anode of the second zener diode, and cathodes of the first zener diode and the second zener diode are respectively connected to two ends of the protection resistance unit.

4. The gas range of claim 2, wherein the protection resistance unit comprises a first resistance and a second resistance connected in parallel.

5. The gas range of claim 2, wherein the feedback resistance unit includes a third resistance and a fourth resistance arranged in series.

6. The gas stove of claim 2, wherein the feedback module further comprises a fifth resistor and a sixth resistor connected in series, two ends of the fifth resistor and the sixth resistor connected in series are respectively connected with the second end of the electromagnetic proportional valve and the second power supply, and the inverting input end of the comparator is connected between the fifth resistor and the sixth resistor.

7. The gas stove according to claim 2, wherein the amplifying module further comprises a first filter capacitor, a second filter capacitor, a third filter capacitor, a first current limiting resistor and a pull-up resistor, wherein the first filter capacitor is connected between the positive input end of the comparator and the system ground; the second filter capacitor is connected between the negative input end of the comparator and the system ground, and the third filter capacitor is connected between the second power supply and the positive power supply end of the comparator; the pull-up resistor is connected between the output end of the comparator and a second power supply; the first current limiting resistor is connected between the control end of the proportional valve and the positive input end of the comparator.

8. The gas stove of claim 2, wherein the adjusting module further comprises a second current limiting resistor and a third current limiting resistor, the second current limiting resistor is connected between the output end of the amplifying module and the base of the triode; the third current limiting resistor is connected between the collector of the triode and the grid of the MOS tube.

9. The gas stove of claim 2, wherein the proportional valve control circuit further comprises a freewheeling diode, a negative electrode of the freewheeling diode is connected between the first end of the electromagnetic proportional valve and the drain of the MOS tube, and a positive electrode of the freewheeling diode is connected to a system ground.

10. The gas stove of claim 1, wherein the controller further comprises a wireless module, the control center further comprises a wireless signal acquisition port, the wireless signal acquisition port is connected with the wireless module, and the control center performs corresponding control according to the acquired wireless signal:

if the wireless signal comprises temperature data, the control center controls the touch display screen to display the temperature data;

and if the wireless signal comprises menu data, the control center controls the display screen to display the menu data.

11. The gas stove of claim 1, wherein if the touch instruction includes an ideal temperature value, the control center further determines an input current value of the electromagnetic proportional valve according to the ideal temperature value and the temperature information acquired by the wireless module, and outputs a PWM signal to the proportional valve control circuit based on the input current value to control the operation of the electromagnetic proportional valve.

12. The gas stove according to claims 1 to 11, wherein the gas stove comprises a plurality of burners, and if the touch control command comprises a burner selection command, the control center sends a control command formed by the ignition command and the fire power adjustment command to an ignition mechanism and a proportional valve control circuit of the corresponding burner according to the burner selection command.

13. A control circuit for a gas stove with a touch display screen is characterized by comprising:

the control center is provided with a proportional valve control port, a stop valve control port, an ignition control port, a flame detection port and a touch display port;

the proportional valve control circuit corresponding to each electromagnetic proportional valve is connected with the corresponding proportional valve control port and is used for controlling each electromagnetic proportional valve;

the stop valve control circuit is connected with the stop valve control port to control the on-off of the stop valve;

the flame detection control circuit is connected with the flame detection port so as to transmit the flame detection result to the control center;

the touch display driving circuit is connected with the touch display port to control the touch display screen to work and transmit a touch instruction of the touch display screen to the control center;

the control center is used for executing corresponding control according to the touch instruction:

if the touch instruction comprises an ignition instruction, the control center controls the stop valve to be opened according to the ignition instruction and controls the ignition mechanism to ignite;

if the touch control instruction comprises a firepower adjusting instruction, the control center determines the current value of the proportional valve according to the firepower adjusting instruction, and outputs PWM signals to proportional valve control ports corresponding to the first electromagnetic proportional valve and the second electromagnetic proportional valve based on the current value.

14. The control circuit of claim 13, wherein the proportional valve control circuit comprises:

the adjusting module comprises a triode, an MOS (metal oxide semiconductor) tube, a voltage stabilizing diode unit and a protective resistance unit, wherein two ends of the protective resistance unit are connected with two ends of the voltage stabilizing diode unit and a source electrode and a grid electrode of the MOS tube, one end connected with the source electrode is connected with a first power supply source, and the other end connected with the grid electrode is connected with a collector electrode of the triode; the drain electrode of the MOS tube is connected with the first end of the proportional valve; the emitter of the triode is connected with the system ground, and the base of the triode is connected with the output end of the amplification power supply;

the amplifying module comprises a comparator, wherein a positive power supply end of the comparator is connected with a second power supply, a negative power supply end of the comparator is connected with the system ground, a positive input end of the comparator is connected with the control port of the proportional valve, and a negative input end of the comparator is connected with the second end of the proportional valve;

the feedback module comprises a feedback resistance unit, and two ends of the feedback resistance unit are respectively connected with the second end of the proportional valve and the system ground;

and the negative electrode of the freewheeling diode is connected between the first end of the proportional valve and the drain electrode of the MOS tube, and the positive electrode of the freewheeling diode is connected to the system ground.

Technical Field

The invention relates to the technical field of gas cookers, in particular to a control circuit for a gas cooker with a touch display screen and the gas cooker.

Background

The gas stove is mainly characterized in that gas such as liquefied petroleum gas, artificial gas and natural gas is used for heating, the gas enters the stove from a gas inlet pipe, enters a stove head through the adjustment of a gas valve, mixes a part of air, and the mixed gas is sprayed out through an inner ring flame path and an outer ring flame path respectively and is combusted.

In the existing gas stove, the opening degree of the gas valve is adjusted through a mechanical knob and other structures, the air inflow is adjusted through manual operation and is too rough, along with the continuous improvement of the taste, color and luster and the like of dishes, people often want to cook dishes according to the cooking method of a cook, although different prompts are provided for the firepower in some navigation recipes, the firepower is difficult to reach during manual operation, and the firepower is adjusted too rough, so that the cooking grade taste is difficult.

Disclosure of Invention

Based on the above situation, the main objective of the present invention is to provide a control circuit for a gas cooker with a touch display screen and a gas cooker, so as to accurately adjust the gas fire power during the cooking process and improve the taste and color of the dishes.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the invention provides a gas stove, which comprises a burner, wherein the burner comprises an ignition mechanism, a flame detection mechanism, an inner ring flame path, an outer ring flame path, a first electromagnetic proportional valve communicated with the inner ring flame path, a second electromagnetic proportional valve communicated with the outer ring flame path and a stop valve, wherein the first electromagnetic proportional valve and the second electromagnetic proportional valve are communicated with a gas supply end through the stop valve;

the device also comprises a controller and a touch display screen;

the controller comprises a control center, a proportional valve control circuit corresponding to each electromagnetic proportional valve, a stop valve control circuit, an ignition control circuit, a flame detection control circuit and a touch display driving circuit;

the control center is provided with a proportional valve control port, a stop valve control port, an ignition control port, a flame detection port and a touch display port;

each electromagnetic proportional valve is connected with the proportional valve control port through a corresponding proportional valve control circuit, the stop valve is connected with the stop valve control port through a stop valve control circuit, the ignition mechanism is connected with the ignition control port through an ignition control circuit, the flame detection mechanism is connected with the flame detection port through a flame detection control circuit, and the touch display screen is connected with the touch display port through a touch display driving circuit;

the touch display screen is used for acquiring a touch instruction and sending the touch instruction to the control center;

the control center is used for executing corresponding control according to the touch instruction:

if the touch instruction comprises an ignition instruction, the control center controls the stop valve to be opened according to the ignition instruction and controls the ignition mechanism to ignite;

if the touch control instruction comprises a firepower adjusting instruction, the control center determines respective input current values of the first electromagnetic proportional valve and the second electromagnetic proportional valve according to the firepower adjusting instruction, and outputs PWM signals to proportional valve control ports corresponding to the first electromagnetic proportional valve and the second electromagnetic proportional valve based on the respective input current values.

Preferably, the proportional valve control circuit comprises an amplifying module, an adjusting module and a feedback module, wherein the adjusting module comprises a triode, a field effect transistor, a voltage stabilizing diode unit and a protection resistance unit;

the two ends of the protection resistance unit are connected with the two ends of the voltage stabilizing diode unit, and are also connected with the source electrode and the grid electrode of the field effect transistor, one end connected with the source electrode is also connected with a first power supply source, and the other end connected with the grid electrode is also connected with the collector electrode of the triode; the drain electrode of the field effect tube is connected with the first end of the electromagnetic proportional valve; the emitter of the triode is connected with the system ground, and the base of the triode is connected with the output end of the amplification module; the amplifying module comprises a comparator, wherein a positive power supply end of the comparator is connected with a second power supply, a negative power supply end of the comparator is connected with the system ground, a positive input end of the comparator is connected with the control port of the electromagnetic proportional valve, and a negative input end of the comparator is connected with the second end of the proportional valve; the feedback module comprises a feedback resistance unit, and two ends of the feedback resistance unit are respectively connected with the second end of the electromagnetic proportional valve and the system ground.

Preferably, the zener diode unit includes a first zener diode and a second zener diode, an anode of the first zener diode is connected to an anode of the second zener diode, and cathodes of the first zener diode and the second zener diode are respectively connected to two ends of the protection resistance unit.

Preferably, the protection resistance unit includes a first resistance and a second resistance connected in parallel.

Preferably, the feedback resistance unit includes a third resistance and a fourth resistance arranged in series.

Preferably, the feedback module further includes a fifth resistor and a sixth resistor connected in series, two ends of the fifth resistor and the sixth resistor connected in series are respectively connected to the second end of the electromagnetic proportional valve and the second power supply, and the inverting input end of the comparator is connected between the fifth resistor and the sixth resistor.

Preferably, the amplifying module further includes a first filter capacitor, a second filter capacitor, a third filter capacitor, a first current limiting resistor, and a pull-up resistor, where the first filter capacitor is connected between the positive input end of the comparator and the system ground; the second filter capacitor is connected between the negative input end of the comparator and the system ground, and the third filter capacitor is connected between the second power supply and the positive power supply end of the comparator; the pull-up resistor is connected between the output end of the comparator and a second power supply; the first current limiting resistor is connected between the control end of the proportional valve and the positive input end of the comparator.

Preferably, the adjusting module further includes a second current limiting resistor and a third current limiting resistor, and the second current limiting resistor is connected between the output end of the amplifying module and the base of the triode; the third current limiting resistor is connected between the collector of the triode and the grid of the MOS tube.

Preferably, the proportional valve control circuit further comprises a freewheeling diode, a negative electrode of the freewheeling diode is connected between the first end of the electromagnetic proportional valve and the drain of the MOS transistor, and a positive electrode of the freewheeling diode is connected to the system ground.

Preferably, the controller further includes a wireless module, the control center further includes a wireless signal acquisition port, the wireless signal acquisition port is connected to the wireless module, and the control center executes corresponding control according to the acquired wireless signal:

if the wireless signal comprises temperature data, the control center controls the touch display screen to display the temperature data;

and if the wireless signal comprises menu data, the control center controls the display screen to display the menu data.

Preferably, if the touch instruction includes an ideal temperature value, the control center further determines an input current value of the electromagnetic proportional valve according to the ideal temperature value and the temperature information acquired by the wireless module, and outputs a PWM signal to the proportional valve control circuit based on the input current value to control the electromagnetic proportional valve to operate.

Preferably, the gas stove comprises a plurality of burners, and if the touch instruction comprises a burner selection instruction, the control center sends a control instruction formed by the ignition instruction and the fire power adjustment instruction to an ignition mechanism and a proportional valve control circuit of the corresponding burner according to the burner selection instruction.

A second aspect of the present invention provides a control circuit for a gas range having a touch display screen, comprising:

the control center is provided with a proportional valve control port, a stop valve control port, an ignition control port, a flame detection port and a touch display port;

the proportional valve control circuit corresponding to each electromagnetic proportional valve is connected with the corresponding proportional valve control port and is used for controlling each electromagnetic proportional valve;

the stop valve control circuit is connected with the stop valve control port to control the on-off of the stop valve;

the flame detection control circuit is connected with the flame detection port so as to transmit the flame detection result to the control center;

the touch display driving circuit is connected with the touch display port to control the touch display screen to work and transmit a touch instruction of the touch display screen to the control center;

the control center is used for executing corresponding control according to the touch instruction:

if the touch instruction comprises an ignition instruction, the control center controls the stop valve to be opened according to the ignition instruction and controls the ignition mechanism to ignite;

if the touch control instruction comprises a firepower adjusting instruction, the control center determines the current value of the proportional valve according to the firepower adjusting instruction, and outputs PWM signals to proportional valve control ports corresponding to the first electromagnetic proportional valve and the second electromagnetic proportional valve based on the current value.

Preferably, the proportional valve control circuit includes:

the adjusting module comprises a triode, an MOS (metal oxide semiconductor) tube, a voltage stabilizing diode unit and a protective resistance unit, wherein two ends of the protective resistance unit are connected with two ends of the voltage stabilizing diode unit and a source electrode and a grid electrode of the MOS tube, one end connected with the source electrode is connected with a first power supply source, and the other end connected with the grid electrode is connected with a collector electrode of the triode; the drain electrode of the MOS tube is connected with the first end of the proportional valve; the emitter of the triode is connected with the system ground, and the base of the triode is connected with the output end of the amplification power supply;

the amplifying module comprises a comparator, wherein a positive power supply end of the comparator is connected with a second power supply, a negative power supply end of the comparator is connected with the system ground, a positive input end of the comparator is connected with the control port of the proportional valve, and a negative input end of the comparator is connected with the second end of the proportional valve;

the feedback module comprises a feedback resistance unit, and two ends of the feedback resistance unit are respectively connected with the second end of the proportional valve and the system ground;

and the negative electrode of the freewheeling diode is connected between the first end of the proportional valve and the drain electrode of the MOS tube, and the positive electrode of the freewheeling diode is connected to the system ground.

The gas stove is provided with the touch display screen, the controller also comprises a touch display driving circuit, and the control center is connected with the touch display screen, the ignition mechanism, the flame detection mechanism, each proportional valve and the stop valve through respective control circuits, so that when ignition or fire adjustment is needed, the control center can be controlled through touch operation of the touch display screen, so that fire information prompted by a menu and the like can be accurately adjusted, and even after a navigation menu is selected through touch operation, the control center can be accurately adjusted according to the temperature in the navigation menu or the opening of the proportional valve when the navigation menu is automatically operated.

Other advantages of the present invention will be described in the detailed description, and those skilled in the art will understand the technical features and technical solutions presented in the description.

Drawings

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure:

FIG. 1 is a system diagram of a preferred embodiment of a gas range provided by the present invention;

FIG. 2 is a schematic diagram of a preferred embodiment of a proportional valve control circuit in the control circuit provided by the present invention;

fig. 3 is a schematic diagram of a preferred embodiment of an ignition control circuit in the control circuit provided by the present invention.

In the figure, the position of the upper end of the main shaft,

10. a burner; 11. an ignition mechanism; 12. a flame detection mechanism; 13. a first electromagnetic proportional valve; 14. a second electromagnetic proportional valve; 15. a stop valve;

20. a controller; 21. a control center; 22. a proportional valve control circuit; 221. an amplifying module; 222. an adjustment module; 223. a feedback module; 23. a stop valve control circuit; 24. an ignition control circuit; 25. a flame detection control circuit; 26. a touch display driving circuit;

30. touch-control display screen.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in order to avoid obscuring the nature of the present invention, well-known methods, procedures, and components have not been described in detail.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The invention provides a gas stove, as shown in fig. 1, the gas stove comprises a burner 10, the burner 10 comprises an ignition mechanism 11, a flame detection mechanism 12, an inner ring flame path, an outer ring flame path, a first electromagnetic proportional valve 13 communicated with the inner ring flame path, a second electromagnetic proportional valve 14 communicated with the outer ring flame path, and a stop valve 15, the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 are communicated with a gas supply end through the stop valve 15, specifically, the burner 10 can be provided with only one, or can be provided with a plurality of, such as two, three or more, the gas supply end is connected with the stop valve 15 of each burner 10 through a gas inlet main, two outlets of the stop valve 15 are respectively connected with the first proportional valve 13 and the second proportional valve 14, and thus, gas needs to enter the inner ring flame path and the outer ring flame path through the stop valve 15, the first proportional valve 13 and the second proportional valve 14.

The gas stove further comprises a controller 20 and a touch display screen 30, wherein the controller 20 comprises a control center 21, a proportional valve control circuit 22 corresponding to each electromagnetic proportional valve, a stop valve control circuit 23, an ignition control circuit 24, a flame detection control circuit 25 and a touch display driving circuit 26; the control center 21 has a proportional valve control port, a stop valve control port, an ignition control port, a flame detection port, and a touch display port.

Each electromagnetic proportional valve is connected with the proportional valve control port through a corresponding proportional valve control circuit, that is, a first proportional valve control circuit and a second proportional valve control circuit are respectively connected with the corresponding first electromagnetic proportional valve 13 and the corresponding second electromagnetic proportional valve 14, the control center is provided with a corresponding first proportional valve control port and a corresponding second proportional valve control port, the first electromagnetic proportional valve 13 is connected with the first proportional valve control port through the first proportional valve control circuit, and the second electromagnetic proportional valve 14 is connected with the second proportional valve control port through the second proportional valve control circuit. The stop valve 15 is connected with the stop valve control port through the stop valve control circuit 23, the ignition mechanism 11 is connected with the ignition control port through the ignition control circuit 24, the flame detection mechanism 12 is connected with the flame detection port through the flame detection control circuit 25, and the touch display screen 30 is connected with the touch display port through the touch display drive circuit 26. When a plurality of burners 10 are provided, a set of a first electromagnetic proportional valve 13, a second electromagnetic proportional valve 14, a first proportional valve control circuit, a second proportional valve control circuit, a first proportional valve control port and a second proportional valve control port, a stop valve 15, a stop valve control circuit 23, an ignition mechanism 11, an ignition control circuit 24, a flame detection mechanism 12, and a flame detection control circuit is provided for each burner 10. Even when a plurality of burners 10 are provided, only one set of the touch display panel 30 and the touch display driving circuit 26 may be provided, and different burners 10 can be controlled by the same touch display panel 30.

Specifically, the touch display screen 30 is configured to obtain a touch instruction and send the touch instruction to the control center 21, that is, the touch display screen 30 is an interface between a user and the gas stove, and the user can control the gas stove in a touch manner. When the touch display screen 30 is touched, a touch instruction is generated, and after receiving the touch instruction through the touch display driving circuit 26, the control center 21 executes corresponding control according to the touch instruction:

if the touch instruction comprises an ignition instruction, the control center 21 controls the stop valve 15 to open according to the ignition instruction and controls the ignition mechanism 11 to ignite, that is, the control center 21 outputs a stop valve opening signal to the stop valve control port according to the ignition instruction, the stop valve control circuit 23 receives the stop valve opening signal and then controls the stop valve 15 to open, and at the same time, outputs a control signal (which may be a certain preset PWM signal corresponding to the opening degree of the proportional solenoid valve) to the proportional valve control port, and the proportional valve control circuit 22 controls the proportional solenoid valve to open; the control center 21 outputs an ignition signal to the ignition control port, and the ignition control circuit 24 receives the ignition signal and controls the ignition mechanism 11 to ignite;

if the touch control instruction comprises a fire power adjusting instruction, the control center 21 determines respective input current values of the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 according to the fire power adjusting instruction, and outputs PWM signals to proportional valve control ports corresponding to the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 based on the respective input current values, that is, the control center 21 determines an input current value (marked as a first current value) of the first electromagnetic proportional valve 13 and an input current value (marked as a second current value) of the second electromagnetic proportional valve 14 according to the fire power adjusting instruction, and then outputs a first PWM signal to the first proportional valve control port based on the first current value, and the first electromagnetic proportional valve control circuit operates and controls the opening degree of the first electromagnetic proportional valve 13 after receiving the first PWM signal; and outputting a second PWM signal to a second proportional valve control port based on the second current value, and controlling the opening degree of the second electromagnetic proportional valve 14 after the second electromagnetic proportional valve control circuit receives the second PWM signal.

The ignition instruction and the fire power adjustment instruction may be directly input by the user through the touch display screen 30, and the touch instruction directly includes the ignition instruction and the fire power adjustment instruction, that is, the instructions are the touch instructions formed by the direct touch display screen 30 through the user touch operation. The instructions may also be instructions indirectly included in the touch instructions, specifically, in some cases, the gas stove may operate by itself through the navigation recipe, in this case, the user may select the navigation recipe only through the touch display screen 30, and then the gas stove may automatically operate according to the navigation recipe to cook, in this embodiment, the touch instructions are actually the selection of the navigation recipe, and the navigation recipe may include a plurality of cooking stages, each cooking stage may have an ignition instruction, a fire power adjustment instruction, and the like, after receiving the touch instructions, the control center 21 may sequentially execute each cooking stage of the navigation recipe, and when the cooking stage where the ignition instruction is located is operated, the control center 21 generates a stop valve opening signal according to the ignition instruction of the cooking stage; when the cooking stage in which the fire power adjustment instruction is executed, the control center 21 generates the first current value and the second current value according to the fire power adjustment instruction of the cooking stage.

It is understood that after the ignition is completed, the control center 21 will also generate and output a stop ignition signal to the ignition control port to control the ignition mechanism 11 to stop working through the ignition control circuit 24. Whether the ignition is successful or not can be detected through the flame detection mechanism 12, when the flame detection mechanism 12 detects that flame exists, a flame signal is sent to the flame detection port, and the control center 21 generates an ignition signal or stops the ignition signal according to the flame signal.

The gas stove is provided with a touch display screen 30, the controller 20 further comprises a touch display driving circuit 26, the control center 21 is connected with the touch display screen 30, the ignition mechanism 11, the flame detection mechanism 12, the electromagnetic proportional valves (including the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14) and the stop valve 15 through respective control circuits, and therefore when ignition or fire adjustment is needed, the gas stove can be controlled through touch operation of the touch display screen 30, so that fire information prompted by a menu and the like can be accurately adjusted, and even when a navigation menu is automatically operated after the navigation menu is selected through touch operation, accurate adjustment can be performed according to the temperature in the navigation menu or the opening of the fire proportional valve.

In fact, the control center 21 also generates a stop valve closing signal when receiving the fire shut-off command, and sends it to the stop valve control port to control the stop valve 15 to close through the stop valve control circuit 23. The fire-off instruction may be generated by directly touching the touch display screen 30, or may be an instruction included in a navigation menu generated by touching the touch display screen 30.

Specifically, the first electromagnetic proportional valve 13 is connected to the first proportional valve control circuit in the same manner as the second electromagnetic proportional valve 14 is connected to the second proportional valve control circuit, and therefore, the first electromagnetic proportional valve and the proportional valve control circuit 22 corresponding thereto are described as an example, and for convenience of description, the first electromagnetic proportional valve is simply referred to as an electromagnetic proportional valve, and the first proportional valve control circuit is simply referred to as a proportional valve control circuit.

As shown in fig. 2, the proportional valve control circuit 22 includes an amplifying module 221, an adjusting module 222, and a feedback module 223, where the adjusting module 222 includes a transistor Q1, a field effect transistor Q2, a zener diode unit, and a protection resistor unit; the two ends of the protection resistance unit are connected with the two ends of the voltage stabilizing diode unit, and are also connected with the source electrode and the grid electrode of the field effect transistor Q2, one end connected with the source electrode is also connected with a first power supply VC1, and one end connected with the grid electrode is also connected with the collector electrode of the triode Q1; the drain electrode of the field effect tube Q2 is connected with the first end of the electromagnetic proportional valve; the emitter of the transistor Q1 is connected to system ground, and the base is connected to the output of the amplifying module 221. The amplifying module 221 comprises a comparator U1, wherein a positive power supply of the comparator U17 is connected with the second power supply VC2, a negative power supply is connected with the system ground, a positive input end is connected with a control port of the electromagnetic proportional valve, and a negative input end is connected with a second end of the electromagnetic proportional valve. The feedback module 223 includes a feedback resistance unit, and two ends of the feedback resistance unit are respectively connected with the second end of the electromagnetic proportional valve and the system ground.

When the gas stove is in operation, when the control center 21 extracts a fire power adjustment command, a PWM signal corresponding to the fire power adjustment command is obtained through processing, the PWM signal has a certain duty ratio, the PWM signal is output to the proportional valve control port, the proportional valve control circuit 22 compares the voltage of the feedback module receiving the PWM signal and the input current of the electromagnetic proportional valve through the comparator U1, and controls the output of the comparator U1, specifically, when the opening degree of the electromagnetic proportional valve is too large (i.e., the input current value is too large), the output end of the comparator U1 outputs a signal to control the triode Q1 and the MOS tube Q2 to be closed, so as to reduce the input current flowing through the electromagnetic proportional valve, i.e., reduce the opening degree of the electromagnetic proportional valve. On the contrary, when the opening of the electromagnetic proportional valve is too small, the output end of the comparator U1 outputs a control signal to control the transistor Q1 and the MOS transistor Q2 to open, so as to increase the input current of the electromagnetic proportional valve, i.e., increase the opening of the electromagnetic proportional valve, and finally, maintain the opening of the electromagnetic proportional valve at a small fluctuation from top to bottom corresponding to the fire power value of the fire power command, i.e., to be in a stable state. In the invention, on the first hand, the combination of the triode Q1 and the MOS transistor Q2 is adopted in the adjusting module 222 to control the electromagnetic proportional valve, so that the efficiency is higher and the power is lower; and the whole proportional valve control circuit 22 can isolate external interference, and the working stability of the proportional valve is increased, so that the control precision of the proportional valve is improved. In a second aspect, if the impedance between the gate and the source of the MOS transistor Q2 is too high, the sudden change in the drain-source voltage can be coupled to the gate through the inter-electrode capacitance to generate a relatively high voltage overshoot between the gate and the source, which can cause permanent damage to the gate oxide layer and, if the voltage is transient in the positive direction, can also cause mis-conduction of the device. Therefore, the impedance of the gate driving circuit is properly reduced, and in the present invention, the adjusting module 222 further includes a zener diode unit and a protection resistor unit, which are disposed between the gate and the source of the MOS transistor Q2, and the current flowing through the zener diode unit can be limited by the protection resistor unit, so that the combination of the two can stabilize the voltage, prevent the gate of the MOS transistor Q2 from being opened, protect the MOS transistor Q2, and further improve the reliability of the whole proportional valve control circuit 22. In a third aspect, the adjusting module 222 of the present invention further includes a feedback resistor unit, which is connected between the second end of the electromagnetic proportional valve and the system ground to form a sampling circuit, and a current in the sampling circuit is fed back to the inverting input terminal of the comparator U1 to be compared with the PWM signal at the forward input terminal, so as to achieve accurate control of the whole proportional valve control circuit 22, and improve the accuracy of controlling the electromagnetic proportional valve.

Specifically, the zener diode unit may include only one zener diode, and in a preferred embodiment of the present invention, the zener diode unit includes a first zener diode D1 and a second zener diode D2, an anode of the first zener diode is connected to an anode of the second zener diode, and cathodes of the first zener diode and the second zener diode are respectively disposed at two ends of the protection resistance unit. Considering that the MOS transistor Q2 is connected with an electromagnetic proportional valve, the electromagnetic proportional valve generates a relatively high instantaneous voltage when being suddenly powered on and suddenly powered off, the two reverse series-connected zener diodes can perform a bidirectional voltage stabilizing function on the MOS transistor Q2, and when an overvoltage occurs between the source and the gate of the MOS transistor Q2, the first zener diode D1 and the second zener diode D2 are firstly broken down to generate a short circuit, so as to better protect the MOS transistor Q2.

The protection resistance unit can only comprise one resistor, and in the invention, the protection resistance unit comprises a first resistor R1 and a second resistor R2 which are connected in parallel, and the combination of the two resistors can achieve the effect of voltage division and better protect the MOS transistor.

The feedback resistance unit comprises a third resistor R3 and a fourth resistor R4 which are arranged in series, and the feedback current of the electromagnetic proportional valve can be limited through the series connection of the two resistors, so that the reliability of the whole proportional valve control circuit 22 is protected. Of course, the feedback resistance unit may include only one resistance, three or more resistances.

With continued reference to fig. 2, the feedback module 223 further includes a fifth resistor R5 and a sixth resistor R6 connected in series, both ends of the fifth resistor R5 and the sixth resistor R6 after being connected in series are respectively connected to the second end of the electromagnetic proportional valve and the second power supply VC2, at this time, the inverting input end of the comparator U1 is connected between the fifth resistor R5 and the sixth resistor R6, so as to limit the voltage input to the comparator U1, and ensure the reliability of the operation of the comparator U1.

Further, the adjusting module 222 further includes a second current limiting resistor R8 and a third current limiting resistor R9, wherein the second current limiting resistor R8 is connected between the output terminal of the amplifying module 221 and the base of the transistor Q1; the third current limiting resistor R9 is connected between the collector of the transistor Q1 and the gate of the MOS transistor Q2, and the current of the circuit in which the third current limiting resistor R9 is located is limited by adding the current limiting resistor, so that the reliability of the entire electromagnetic proportional valve control circuit 22 is ensured.

The amplifying module 221 further includes a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, a first current limiting resistor R7, and a pull-up resistor R10, wherein the first filter capacitor C1 is connected between the positive input terminal of the comparator Q1 and the system ground; the second filter capacitor C2 is connected between the negative input terminal of the comparator Q1 and the system ground, and the third filter capacitor C3 is connected between the second power supply VC2 and the positive power supply terminal of the comparator Q1; the pull-up resistor R10 is connected between the output end of the comparator Q1 and the second power supply VC 2; in the invention, a first current-limiting resistor R7 is connected between a proportional valve control port and a positive input end of a comparator Q1, signals entering a positive input end and a negative input end of the comparator Q1 can be reduced and smoother through a first filter capacitor C1 and a second filter capacitor C2, signals entering a comparator Q1 are smoother, and signals entering a power supply end of the comparator Q1 are more stable and smoother through a third filter capacitor C3; the pull-up resistor R10 can ensure that the level of the output of the comparator Q1 is high, and the output drive current can be increased.

Specifically, the first current limiting resistor R7, the second current limiting resistor R8, and the third current limiting resistor R9 may include one, two, or more, respectively, and the resistance values of the current limiting resistors may be equal or unequal.

The proportional valve control circuit 22 further includes a freewheeling diode D3, a negative electrode of the freewheeling diode D3 is connected between the first end of the electromagnetic proportional valve and the drain of the MOS transistor Q2, and a positive electrode is connected to the system ground. When current passes through the electromagnetic proportional valve, induced electromotive force is generated at two ends of the electromagnetic proportional valve, and when the current disappears, the induced electromotive force generates reverse voltage on elements in a circuit. When the reverse voltage is higher than the reverse breakdown voltage of the device, the transistor Q1, the MOS transistor Q2, etc. in the regulation control circuit may be damaged. A fly-wheel diode D3 is added to the proportional valve control circuit 22 of the invention, the fly-wheel diode D3 is connected in parallel at two ends of the electromagnetic proportional valve, when the current flowing through the electromagnetic proportional valve disappears, the induced electromotive force generated by the electromagnetic proportional valve is consumed by the work of a loop formed by the fly-wheel diode D3 and the electromagnetic proportional valve, thereby protecting the safety of a triode Q1 and a MOS tube Q2 in an adjusting module.

For the comparators U1 in the two proportional valve control circuits 22 of the same burner 10, independent comparator elements may be selected respectively, or the same comparator element may be selected, when the same comparator element is selected, two sets of positive input terminal, negative input terminal, positive power supply terminal, and negative power supply terminal are provided, and when the third filter capacitor C3 is connected between the positive power supply terminal and the second power supply source VC2, only one of the positive power supply terminals may be connected to the third filter capacitor C3.

The control center 21 can be a single chip microcomputer, and the specific model can be selected according to the requirement.

As shown in fig. 3, in the ignition control circuit 25, the transistors Q17 and Q20 are connected to the primary coil of the ignition transformer T3, the secondary coil of the ignition transformer T3 is connected to the diodes D22 and D29, and the diodes D22 and D29 are connected to the high voltage pack T4 of the ignition mechanism 11 through the discharge capacitor C27, so that when the transistor Q17 receives a control signal output from the ignition control port, the transistors Q17 and Q20 are turned on, the ignition transformer T3 causes the secondary coil to periodically charge and discharge the discharge capacitor C27 through the diodes D22 and D29, and when the discharge capacitor C27 discharges the high voltage pack T4, the secondary coil of the high voltage pack T4 generates a high voltage and discharges through air, thereby achieving ignition.

The flame detection control circuit 25 comprises a flame analog signal detection circuit and a flame analog digital signal conversion circuit which are connected with each other, wherein the flame analog signal detection circuit is connected with the flame detection control port and converts the fire ion signal of the flame detection mechanism 12 into an electric analog signal; the flame analog-to-digital signal conversion circuit converts the electrical analog signal to a signal required by the control center 21.

The cut-off valve control circuit 23 comprises a transistor Q19, and a signal output by a cut-off valve control port controls the transistor Q19 to be turned on or off, so that the cut-off valve 15 connected with the transistor Q19 is controlled to be turned on or off.

Specific values of the capacitors and the resistors may be set according to circuit requirements, but the present invention is not limited to this. The specific values of the first power supply VC1 and the second power supply VC2 can also be set as required, for example, in an embodiment, the value of the first power supply VC1 is selected to be 30V, and the value of the second power supply VC2 is selected to be 5V.

As described above, the gas stove of the present invention can not only realize manual cooking, that is, in each stage of cooking, the touch display screen 30 is manually touched to adjust and control each parameter in cooking, but also realize automatic cooking through navigation of the menu. When the automatic cooking is realized through the navigation recipe, the navigation recipe may be the navigation recipe directly stored in the controller 20, for example, the controller 20 further includes a storage module, and the navigation recipe is stored in the storage module. Sometimes, the user wants to select a richer menu, and the user can operate the menu through a mobile phone, a cloud and the like, and at the moment, the gas stove can be in wireless communication with the mobile phone and the cloud through the wireless module. In the cooking process, especially in the automatic cooking process, temperature information in the pot is often required to be acquired, for some intelligent pots, a temperature sensor and a wireless transmitting module which are connected with each other are arranged on the intelligent pot, and at the moment, the gas stove can acquire the temperature information of the temperature sensor on the intelligent pot through the wireless module. Specifically, the controller 20 further includes a wireless module, the control center 21 further includes a wireless signal obtaining port, the wireless signal obtaining port is connected to the wireless module, and the control center 21 executes corresponding control according to the obtained wireless signal:

if the wireless signal includes temperature data, the control center 21 controls the touch display screen 30 to display the temperature data;

if the wireless signal comprises menu data, the control center controls the display screen to display the menu data, and the menu data can be the navigation menu.

Specifically, in the automatic cooking process, the cooking stage in the navigation recipe may also include some ideal temperatures, or in the manual cooking, the user may also input some ideal temperatures, specifically, if the touch instruction includes an ideal temperature value (including an ideal temperature value input by the direct manual touch operation and an ideal temperature value of the cooking stage obtained through the navigation recipe), the control center 21 further determines an input current value of the electromagnetic proportional valve according to the ideal temperature value and the temperature information obtained through the wireless module, and outputs a PWM signal to the proportional valve control circuit based on the input current value to control the electromagnetic proportional valve to operate. That is, the control center 21 may also determine the input current value of the electromagnetic proportional valve according to the ideal temperature value and the actual temperature information, and of course, determine the input current values of the first electromagnetic proportional valve and the second electromagnetic proportional valve, respectively. Therefore, the accurate control of the whole gas stove on food in the cooking process is improved, and the taste of cooked dishes is improved.

When the gas stove comprises a plurality of burners 10, a user can determine the burner 10 selected for cooking according to touch operation on the touch display screen 30, specifically, if the touch instruction comprises a burner selection instruction, the control center 21 sends a control instruction formed by an ignition instruction and a fire power adjustment instruction to the ignition mechanism 11 and the proportional valve control circuit 22 of the corresponding burner 10 according to the burner selection instruction, that is, the invention can control the plurality of burners 10 by using the same touch display screen 30, and the touch display screen 30 corresponds to each burner 10, so that the space of the gas stove can be obviously saved and the operation of the user is facilitated.

Of course, the control center 30 can touch the display driving circuit 26 through the touch display port input value for the specific fire value, temperature information and the acquired navigation menu in the fire adjustment command, so as to control the touch display screen 30 to display these information.

The specific working process of the gas stove of the invention is as follows: when a user inputs a start-up instruction through the touch display screen 30, and the control center 21 receives the touch instruction, the flame detection control circuit 25 is controlled to detect whether a flame signal is present or not, and if so, the flame signal is abnormal, and if not, the flame signal is normal. When the ignition control circuit 24 works normally, the high-voltage packet T4 on the ignition control circuit discharges to generate electric arc to air, then the control center 21 controls the control circuits of all valve bodies (including the stop valve 15 and the electromagnetic proportional valve) to work, the stop valve control circuit 23 opens the stop valve 15 to open the total air path, the proportional valve control circuit 22 correspondingly opens the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 in sequence, at the moment, the flame detection control circuit 25 detects a flame signal, if flame exists, the control center 21 controls the ignition control circuit 24 to close ignition according to the flame information, and then the working mode is entered; if no flame signal is detected after a certain time, the control center 21 controls the ignition control circuit 24 to close the ignition and stop valve control circuit 23 to close the stop valve 15, the proportional valve control circuit 22 to close the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14, then the steps are repeated, if flame is still not detected, the control center 21 outputs an abnormal state, and the information can be displayed through the touch display screen.

In addition, the present invention further provides a control circuit for a gas stove with a touch display screen, which may be packaged as the controller, and specifically includes the components of the controller 20, so that the details are not repeated herein.

It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.

It will be understood that the embodiments described above are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions for details described herein may be made by those skilled in the art without departing from the basic principles of the invention.