阅读说明：本技术 一种电磁阀检测电路、电路板及燃气热水器 (Electromagnetic valve detection circuit, circuit board and gas water heater ) 是由 田宁波 张伟 于 2021-08-02 设计创作，主要内容包括：本发明实施例公开了一种电磁阀控制电路、电路板及燃气热水器。该电磁阀控制电路包括：主阀、与主阀电连接的主阀驱动电路、至少一个分段阀、至少一个与分段阀电连接的分段阀驱动电路、检测电路和控制模块；控制模块用于产生电磁阀控制信号,并将电磁阀控制信号输入至与电磁阀控制信号对应的主阀驱动电路或分段阀驱动电路,以控制主阀驱动电路或分段阀驱动电路驱动对应的主阀或分段阀通电,并生成主阀或分段阀的反馈信号；检测电路用于将反馈信号转换成电磁阀检测信号,并将电磁阀检测信号反馈至控制模块,以控制控制模块根据电磁阀检测信号判断主阀或分段阀是否处于正常运行状态。本发明实施例的技术方案,保证燃气热水器的正常使用。(The embodiment of the invention discloses an electromagnetic valve control circuit, a circuit board and a gas water heater. This solenoid valve control circuit includes: the main valve driving circuit is electrically connected with the main valve, the at least one section valve driving circuit is electrically connected with the section valve, the detection circuit and the control module; the control module is used for generating an electromagnetic valve control signal and inputting the electromagnetic valve control signal to a main valve driving circuit or a sectional valve driving circuit corresponding to the electromagnetic valve control signal so as to control the main valve driving circuit or the sectional valve driving circuit to drive the corresponding main valve or the sectional valve to be electrified and generate a feedback signal of the main valve or the sectional valve; the detection circuit is used for converting the feedback signal into an electromagnetic valve detection signal and feeding the electromagnetic valve detection signal back to the control module so as to control the control module to judge whether the main valve or the sectional valve is in a normal operation state or not according to the electromagnetic valve detection signal. The technical scheme of the embodiment of the invention ensures the normal use of the gas water heater.)

1. A solenoid valve detection circuit, comprising:

the device comprises a main valve, a main valve driving circuit electrically connected with the main valve, at least one sectional valve driving circuit electrically connected with the sectional valve, a detection circuit and a control module;

the control module is respectively in communication connection with the main valve driving circuit and the segment valve driving circuit, and is used for generating an electromagnetic valve control signal and inputting the electromagnetic valve control signal to the main valve driving circuit or the segment valve driving circuit corresponding to the electromagnetic valve control signal so as to control the main valve driving circuit or the segment valve driving circuit to drive the corresponding main valve or the segment valve to be electrified and generate a feedback signal of the main valve or the segment valve;

the detection circuit is respectively in communication connection with the main valve and at least one of the segment valves, the detection circuit is electrically connected with the control module, and the detection circuit is used for converting the feedback signal into an electromagnetic valve detection signal and feeding the electromagnetic valve detection signal back to the control module so as to control the control module to judge whether the main valve or the segment valve is in a normal operation state according to the electromagnetic valve detection signal.

2. The solenoid detection circuit of claim 1, wherein the segmented valve drive circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor, and a first diode;

the signal output end of the control module is electrically connected with the first end of the first resistor, the second end of the first resistor is electrically connected with the control end of the first triode and the first end of the second resistor respectively, the first end of the first triode is electrically connected with the first end of the third resistor, the second end of the second resistor and the second end of the first triode are grounded, the second end of the third resistor is electrically connected with the first end of the fourth resistor and the control end of the second triode respectively, the second end of the fourth resistor is electrically connected with the first end of the second triode, the first end of the fifth resistor and the power supply end respectively, the second end of the second triode is electrically connected with the second end of the fifth resistor and the cathode of the first diode respectively, and the anode of the first diode is grounded.

3. The solenoid detection circuit of claim 2, wherein a first terminal of the segment valve is electrically connected to the second terminal of the second transistor, a second terminal of a fifth resistor, and a cathode of the first diode, respectively, and a second terminal of the segment valve is electrically connected to an anode of the first diode.

4. The solenoid detection circuit of claim 1, wherein the main valve drive circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a rectifying capacitor, a second diode, a third triode, and a fourth triode;

the signal output end of the control module is electrically connected with the first end of the sixth resistor and the anode of the rectifying capacitor, the second end of the sixth resistor is grounded, the cathode of the rectifying capacitor is electrically connected with the first end of the seventh resistor, the second end of the seventh resistor is electrically connected with the cathode of the second diode and the control end of the third triode, the anode of the second diode is grounded, the first end of the third triode is electrically connected with the first end of the eighth resistor, the second end of the third triode is grounded, the second end of the eighth resistor is electrically connected with the first end of the ninth resistor and the control end of the fourth triode, the second end of the ninth resistor is electrically connected with the first end of the fourth triode, the first end of the tenth resistor and the power supply end, and the second end of the fourth triode is electrically connected with the second end of the tenth resistor and the cathode of the third diode And the anode of the third diode is grounded.

5. The solenoid detection circuit of claim 4, wherein the first end of the main valve is electrically connected to the second end of the fourth transistor, the second end of the tenth resistor, and the cathode of the third diode, respectively, and the second end of the main valve is electrically connected to the anode of the third diode.

6. The solenoid detection circuit of claim 1, wherein the detection circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fifth triode, a main valve resistor, and at least one segment valve resistor;

the first end of the main valve resistor is electrically connected with the first end of the main valve, the second end of the main valve resistor is respectively electrically connected with the first end of the eleventh resistor and the control end of the fifth triode, the first end of the sectional valve resistor is electrically connected with the first end of the sectional valve, the second end of the sectional valve resistor is respectively electrically connected with the first end of the eleventh resistor and the control end of the fifth triode, the second end of the eleventh resistor is grounded, the first end of the fifth triode is respectively electrically connected with the first end of the twelfth resistor and the first end of the thirteenth resistor, the second end of the twelfth resistor is electrically connected with the power supply end, the second end of the thirteenth resistor is electrically connected with the signal input end of the control module, and the second end of the fifth triode is grounded.

7. The electromagnetic valve detection circuit according to claim 6, wherein the electromagnetic valve control signal is a high level signal, the main valve driving circuit or the segment valve driving circuit receives the high level signal and outputs the feedback signal as a high level signal, the fifth transistor is turned on, and the detection circuit outputs the electromagnetic valve detection signal as a low level signal.

8. The electromagnetic valve detection circuit according to claim 6, wherein the electromagnetic valve control signal is a low level signal, the main valve driving circuit or the segment valve driving circuit receives the low level signal and outputs the feedback signal as a low level signal, the fifth transistor is turned off, and the detection circuit outputs the electromagnetic valve detection signal as a high level signal.

9. A circuit board comprising a solenoid valve detection circuit according to any one of claims 1 to 8.

10. A gas water heater comprising the circuit board of claim 9.

Technical Field

The embodiment of the invention relates to the technical field of electromagnetic valve control, in particular to an electromagnetic valve control circuit, a circuit board and a gas water heater.

Background

The electromagnetic valve of the gas water heater is a core component of the gas water heater, the temperature is automatically controlled by controlling the on-off combustion of natural gas or coal gas, the electromagnetic valve belongs to a safety emergency cut-off device, and when the electromagnetic valve fails or a driving circuit is abnormal, an early warning is sent out to cut off the gas valve so as to ensure the use safety of the gas water heater product.

The electromagnetic valve of the gas water heater is generally controlled by direct current voltage, and because the electromagnetic valve is an inductive load, namely the load current lags behind the load voltage by a phase difference, the electromagnetic valve is controlled by pulse voltage in order to reduce power consumption and prolong the service life of the electromagnetic valve. The sectional combustion is adopted in the actual operation of the gas water heater, the sectional combustion refers to the quantity control of fire rows in a combustion chamber in the water heater, electromagnetic valves are all opened when the highest gear is reached, all the fire rows are combusted, and the rest gears achieve the effect of controlling the temperature by reducing the number of the electromagnetic valves for closing part of the fire rows. Therefore, a plurality of electromagnetic valves exist in the gas water heater, and specifically comprise a main valve, a sectional valve 1, a sectional valve 2, a sectional valve 3 and the like, and each electromagnetic valve needs to be fed back to the controller in time when being opened and closed normally and having an abnormal fault so as to ensure the normal use of the gas water heater.

At present, in order to ensure the normal use of the gas water heater in the prior art, a single detection mode for each electromagnetic valve of the gas water heater is adopted, the circuit is complex and high in cost, more resources of a single chip microcomputer port of a controller need to be occupied, and the portability is poor.

Disclosure of Invention

The embodiment of the invention provides an electromagnetic valve control circuit, a circuit board and a gas water heater, which are used for realizing real-time accurate detection of electromagnetic valve faults and ensuring normal use of the gas water heater.

In a first aspect, an embodiment of the present invention provides a solenoid valve control circuit, including:

the device comprises a main valve, a main valve driving circuit electrically connected with the main valve, at least one sectional valve driving circuit electrically connected with the sectional valve, a detection circuit and a control module;

the control module is respectively in communication connection with the main valve driving circuit and the segment valve driving circuit, and is used for generating an electromagnetic valve control signal and inputting the electromagnetic valve control signal to the main valve driving circuit or the segment valve driving circuit corresponding to the electromagnetic valve control signal so as to control the main valve driving circuit or the segment valve driving circuit to drive the corresponding main valve or the segment valve to be electrified and generate a feedback signal of the main valve or the segment valve;

the detection circuit is respectively in communication connection with the main valve and at least one of the segment valves, the detection circuit is electrically connected with the control module, and the detection circuit is used for converting the feedback signal into an electromagnetic valve detection signal and feeding the electromagnetic valve detection signal back to the control module so as to control the control module to judge whether the main valve or the segment valve is in a normal operation state according to the electromagnetic valve detection signal.

Optionally, the segment valve driving circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first triode, a second triode, and a first diode;

the signal output end of the control module is electrically connected with the first end of the first resistor, the second end of the first resistor is electrically connected with the control end of the first triode and the first end of the second resistor respectively, the first end of the first triode is electrically connected with the first end of the third resistor, the second end of the second resistor and the second end of the first triode are grounded, the second end of the third resistor is electrically connected with the first end of the fourth resistor and the control end of the second triode respectively, the second end of the fourth resistor is electrically connected with the first end of the second triode, the first end of the fifth resistor and the power supply end respectively, the second end of the second triode is electrically connected with the second end of the fifth resistor and the cathode of the first diode respectively, and the anode of the first diode is grounded.

Optionally, a first end of the segment valve is electrically connected to the second end of the second triode, the second end of the fifth resistor, and the cathode of the first diode, respectively, and a second end of the segment valve is electrically connected to the anode of the first diode.

Optionally, the main valve driving circuit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a rectifying capacitor, a second diode, a third triode, and a fourth triode;

the signal output end of the control module is electrically connected with the first end of the sixth resistor and the anode of the rectifying capacitor, the second end of the sixth resistor is grounded, the cathode of the rectifying capacitor is electrically connected with the first end of the seventh resistor, the second end of the seventh resistor is electrically connected with the cathode of the second diode and the control end of the third triode, the anode of the second diode is grounded, the first end of the third triode is electrically connected with the first end of the eighth resistor, the second end of the third triode is grounded, the second end of the eighth resistor is electrically connected with the first end of the ninth resistor and the control end of the fourth triode, the second end of the ninth resistor is electrically connected with the first end of the fourth triode, the first end of the tenth resistor and the power supply end, and the second end of the fourth triode is electrically connected with the second end of the tenth resistor and the cathode of the third diode And the anode of the third diode is grounded.

Optionally, the first end of the main valve is electrically connected to the second end of the fourth triode, the second end of the tenth resistor, and the cathode of the third diode, respectively, and the second end of the main valve is electrically connected to the anode of the third diode.

Optionally, the detection circuit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fifth triode, a main valve resistor, and at least one segment valve resistor;

the first end of the main valve resistor is electrically connected with the first end of the main valve, the second end of the main valve resistor is respectively electrically connected with the first end of the eleventh resistor and the control end of the fifth triode, the first end of the sectional valve resistor is electrically connected with the first end of the sectional valve, the second end of the sectional valve resistor is respectively electrically connected with the first end of the eleventh resistor and the control end of the fifth triode, the second end of the eleventh resistor is grounded, the first end of the fifth triode is respectively electrically connected with the first end of the twelfth resistor and the first end of the thirteenth resistor, the second end of the twelfth resistor is electrically connected with the power supply end, the second end of the thirteenth resistor is electrically connected with the signal input end of the control module, and the second end of the fifth triode is grounded.

Optionally, the electromagnetic valve control signal is a high level signal, the main valve driving circuit or the segment valve driving circuit receives the high level signal, the feedback signal is output as a high level signal, the fifth triode is turned on, and the detection circuit outputs an electromagnetic valve detection signal as a low level signal.

Optionally, the electromagnetic valve control signal is a low level signal, the main valve driving circuit or the segment valve driving circuit receives the low level signal, the feedback signal is output as a low level signal, the fifth triode is turned off, and the detection circuit outputs an electromagnetic valve detection signal as a high level signal.

In a second aspect, an embodiment of the present invention further provides a circuit board, where the circuit board includes the electromagnetic valve detection circuit provided in the embodiment of the first aspect of the present invention.

In a third aspect, the embodiment of the invention further provides a gas water heater, which includes the circuit board provided in the embodiment of the second aspect of the invention.

According to the technical scheme of the embodiment of the invention, the electromagnetic valve detection circuit comprises a main valve, a main valve driving circuit electrically connected with the main valve, at least one sectional valve driving circuit electrically connected with the sectional valve, a detection circuit and a control module; the control module is respectively in communication connection with the main valve driving circuit and the segment valve driving circuit, and is used for generating an electromagnetic valve control signal and inputting the electromagnetic valve control signal to the main valve driving circuit or the segment valve driving circuit corresponding to the electromagnetic valve control signal so as to control the main valve driving circuit or the segment valve driving circuit to drive the corresponding main valve or the segment valve to be electrified and generate a feedback signal of the main valve or the segment valve; the detection circuit is respectively in communication connection with the main valve and at least one of the segment valves, the detection circuit is electrically connected with the control module, and the detection circuit is used for converting the feedback signal into an electromagnetic valve detection signal and feeding the electromagnetic valve detection signal back to the control module so as to control the control module to judge whether the main valve or the segment valve is in a normal operation state according to the electromagnetic valve detection signal. The problem of current scheme adopt to detect the mode alone to every solenoid valve of gas heater, its circuit is complicated with high costs, and need occupy controller singlechip port resource than more, transplantation sex is relatively poor is solved to realize that the solenoid valve trouble detects in real time accurately, guarantee gas heater's normal use.

Drawings

FIG. 1 is a schematic structural diagram of a solenoid valve control circuit according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a segment valve drive circuit and a segment valve according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a main valve driving circuit and a main valve according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a detection circuit according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a solenoid valve control circuit according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.

It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.

Fig. 1 is a schematic structural diagram of a solenoid valve control circuit according to an embodiment of the present invention, which is applicable to real-time detection of various abnormal conditions of a solenoid valve. The electromagnetic valve control circuit specifically comprises the following structures:

a main valve 110, a main valve driving circuit 111 electrically connected to said main valve 110, at least one segment valve 120, at least one segment valve driving circuit 121 electrically connected to said segment valve 120, a detection circuit 130 and a control module 140;

the control module 140 is respectively connected to the main valve driving circuit 111 and the segment valve driving circuit 121 in a communication manner, and the control module 140 is configured to generate a solenoid valve control signal, and input the solenoid valve control signal to the main valve driving circuit 111 or the segment valve driving circuit 121 corresponding to the solenoid valve control signal, so as to control the main valve driving circuit 111 or the segment valve driving circuit 121 to drive the corresponding main valve 110 or the segment valve 120 to be energized, and generate a feedback signal of the main valve 110 or the segment valve 120;

the detection circuit 130 is respectively connected to the main valve 110 and at least one of the segment valves 120 in a communication manner, the detection circuit 130 is electrically connected to the control module 140, and the detection circuit 130 is configured to convert the feedback signal into an electromagnetic valve detection signal and feed the electromagnetic valve detection signal back to the control module 140, so as to control the control module 140 to determine whether the main valve 110 or the segment valve 120 is in a normal operation state according to the electromagnetic valve detection signal.

Wherein, there are a plurality of solenoid valves in the gas water heater, the solenoid valve includes the main valve 110 and at least one segment valve 120, the number of the segment valve 120 can be one, two or more. Illustratively, the gas water heater of the present embodiment includes one main valve 110 and three segment valves 120.

The segment valve driving circuits 121 corresponding to the segment valves 120 are the same, all the segment valves 120 may be distinguished by using a method of a reference number, such as the segment valve 1201, the segment valve 1202, and the segment valve 1203, or may be distinguished by using other labeling methods, and this embodiment does not limit the distinguishing method of the segment valves 120 in the same gas water heater.

Optionally, the main valve 110 or the segment valve 120 has a coil resistance value ranging from 80 Ω to 100 ohms.

In the present embodiment, the detection of the solenoid valve, i.e., the main valve 110 and the at least one segment valve 120, respectively, is to generate a solenoid valve control signal through the control module 140 and input the solenoid valve control signal to the solenoid valve. Optionally, the control module 140 may be a single chip microcomputer.

It is understood that the solenoid control signal may be a square wave signal, and the output frequency of the solenoid control signal ranges from 50Hz to 500 Hz.

For example, when the solenoid valve control signal is a high level signal, the voltage of the main valve 110 or the segment valve 120 is the voltage of the power supply terminal, and at this time, the feedback signal is a high level signal, and the detection circuit 130 receives the high level signal and outputs the solenoid valve detection signal as a low level signal; when the solenoid valve control signal is a low level signal, the feedback signal is a low level signal, and the detection circuit 130 receives the low level signal and outputs a solenoid valve detection signal as a high level signal.

In the present embodiment, the power supply terminal refers to a control voltage of the solenoid valve, i.e., a control voltage corresponding to the main valve 110 or the segment valve 120.

It is understood that the above signal detection principle is applied to each solenoid valve of the main valve 110 and the at least one segment valve 120, and when the main valve driving circuit 111 and the segment valve driving circuit 121, the main valve 110 and the segment valve 120 are not failed, and the solenoid valve control signal generated by the control module 140 is a square wave signal, the solenoid valve detection signal output by the detection circuit 130 is a square wave signal.

In order to more accurately determine which solenoid valve (i.e. the main valve 110 or the segment valve 120) is failed, when the gas water heater is in normal operation or standby, the control module 140 outputs a microsecond-level pulse signal in real time, the pulse signal does not cause the solenoid valve to operate, and meanwhile, the detection circuit 130 detects whether a solenoid valve detection signal is input to determine whether the solenoid valve driving circuit is normal, and the main valve 110 and at least one segment valve 120 are respectively and independently output, so as to realize real-time detection of whether the solenoid valve control circuit and operation are normal.

Fig. 2 is a schematic structural diagram of a segment valve driving circuit 121 and a segment valve 120 according to an embodiment of the present invention, and referring to fig. 2, on the basis of the above embodiment, the segment valve driving circuit 121 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first transistor T1, a second transistor T2, and a first diode D1;

a signal output terminal of the control module 140 is electrically connected to a first terminal of the first resistor R1, a second terminal of the first resistor R1 is electrically connected to a control terminal of the first transistor T1 and a first terminal of the second resistor R2, a first terminal of the first transistor T1 is electrically connected to a first terminal of the third resistor R3, a second terminal of the second resistor R2 and a second terminal of the first transistor T1 are grounded, a second terminal of the third resistor R3 is electrically connected to a first terminal of the fourth resistor R4 and a control terminal of the second transistor T2, a second end of the fourth resistor R4 is electrically connected to a first end of the second transistor T2, a first end of the fifth resistor R5 and a power supply terminal, a second terminal of the second transistor T2 is electrically connected to a second terminal of the fifth resistor R5 and the cathode of the first diode D1, respectively, and the anode of the first diode D1 is grounded.

With continued reference to fig. 1 and 2, a signal output of the control module 140 generates a solenoid control signal and inputs the solenoid control signal to the segmented valve driving circuit 121 corresponding to the solenoid control signal.

When the solenoid valve control signal is a high level signal, the first transistor T1 is turned on, the control terminal of the second transistor T2 is a low level signal, the second transistor T2 is turned on, and at this time, the port of the segment valve 120 connected to the positive electrode of the first diode D1 is the power supply terminal voltage, and the power supply terminal voltage signal is input to the detection circuit 130.

When the solenoid valve control signal is a low level signal, the first transistor T1 is turned off, the second transistor T2 is turned off, and at this time, the port voltage U of the segment valve 120 connected to the positive electrode of the first diode D1 is divided by the segment valve 120 and the third resistor R3, i.e., the voltage U can be divided by a formulaIt can be understood that, as long as the resistance value of the third resistor R3 is reasonably wide, the detection circuit 130 will not detect the input voltage signal.

Specifically, the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are all used for limiting current, so as to protect the segment valve driving circuit 121. The fifth resistor R5 is used to share the leakage current generated in the segment valve driving circuit 121, so that the first diode D1 can be reliably in the off state, protect the segment valve 120, and improve the reliability of the segment valve driving circuit 121.

Illustratively, the resistance value of the first resistor R1 is 4.7K, the resistance values of the second resistor R2 and the fourth resistor R4 may range from 10K, the resistance value of the third resistor R3 ranges from 7.5K to 1206, and the resistance value of the fifth resistor is 56K.

With continued reference to fig. 2, based on the above embodiment, the first terminal of the segment valve 120 is electrically connected to the second terminal of the second transistor T2, the second terminal of the fifth resistor R5 and the cathode of the first diode D1, respectively, and the second terminal of the segment valve 120 is electrically connected to the anode of the first diode D1.

With continued reference to fig. 1 and 2, the first terminal of the segment valve 120 is electrically connected to the detection circuit 130, the second terminal of the second transistor T2, the second terminal of the fifth resistor R5, and the cathode of the first diode D1 are electrically connected to the detection circuit 130, and the anode of the first diode D1 is grounded.

Specifically, a first end of the segment valve 120 outputs a feedback signal of the segment valve 120 and inputs the feedback signal to the detection circuit 130. The solenoid valve detection signal is determined by the detection circuit 130 based on the feedback signal, and thus it is determined whether the segment valve 120 is in a normal operation state.

Fig. 3 is a schematic structural diagram of a main valve driving circuit 111 and a main valve 110 according to an embodiment of the present invention, referring to fig. 3, on the basis of the above embodiment, the main valve driving circuit 111 includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a rectifying capacitor E1, a second diode D2, a third diode D3, a third transistor T3, and a fourth transistor T4;

a signal output end of the control module 140 is electrically connected to a first end of the sixth resistor R6 and an anode of the rectifying capacitor E1, respectively, a second end of the sixth resistor R6 is grounded, a cathode of the rectifying capacitor E1 is electrically connected to a first end of the seventh resistor R7, a second end of the seventh resistor R7 is electrically connected to a cathode of the second diode D2 and a control end of the third transistor, an anode of the second diode D2 is grounded, a first end of the third transistor T3 is electrically connected to a first end of the eighth resistor R8, a second end of the third transistor T3 is grounded, a second end of the eighth resistor R8 is electrically connected to a first end of the ninth resistor R9 and a control end of the fourth transistor T4, a second end of the ninth resistor R9 is electrically connected to a first end of the fourth transistor T4, a first end of the tenth resistor R10, and a power supply terminal, a second terminal of the fourth transistor T4 is electrically connected to a second terminal of the tenth resistor R10 and a cathode of the third diode D3, respectively, and an anode of the third diode D3 is grounded.

With continued reference to fig. 1 and 3, the signal output terminal of the control module 140 generates a solenoid control signal and inputs the solenoid control signal to the main valve driving circuit 111 corresponding to the solenoid control signal.

When the solenoid valve control signal is a high level signal, the third transistor T3 is turned on, and the control terminal of the fourth transistor T4 is a low level signal, the fourth transistor T4 is turned on, and at this time, the port where the main valve 110 is connected to the positive electrode of the third diode D3 is the power supply terminal voltage, and the power supply terminal voltage signal is input to the detection circuit 130.

When the solenoid valve control signal is a low level signal, the third transistor T3 is turned off, the fourth transistor T4 is turned off, and the port voltage U at which the main valve 110 is connected to the positive electrode of the third diode D3 is divided by the main valve 110 and the tenth resistor R10, i.e., the port voltage U can be divided by a formulaIt can be understood that, as long as the value range of the tenth resistor R10 is reasonable, the detection circuit 130 will not detect the input voltage signal.

Specifically, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 are all used for limiting the current, thereby protecting the main valve driving circuit 111. The tenth resistor R10 is used to share the leakage current generated in the main valve driving circuit 111, so that the third diode D3 can be reliably turned off, protect the main valve 110, and improve the reliability of the main valve driving circuit 111.

Illustratively, the resistances of the sixth resistor R6 and the seventh resistor R7 are 4.7K, the resistance of the ninth resistor R9 may range from 10K, the resistance of the eighth resistor R8 ranges from 7.5K to 1206, and the resistance of the tenth resistor is 56K.

The rectifying capacitor E1 is used to absorb the electric energy output by the control module 140, and when the electric energy is charged to a certain value, the direct current is fed back to the control module 140, and the control module 140 further controls the on/off of other switches in the main valve driving circuit 111. Optionally, the value range of the rectifying capacitor E1 is 47 μ F/35V.

With continued reference to fig. 3, based on the above embodiment, the first end of the main valve 110 is electrically connected to the second end of the fourth transistor T4, the second end of the tenth resistor R10 and the cathode of the third diode D3, respectively, and the second end of the main valve 110 is electrically connected to the anode of the third diode D3.

With continued reference to fig. 1 and 3, the first terminal of the main valve 110 is electrically connected to the detection circuit 130, the second terminal of the fourth transistor T4, the second terminal of the tenth resistor R10 and the cathode of the third diode D3 are electrically connected to the detection circuit 130, and the anode of the third diode D3 is grounded.

Specifically, the first end of the main valve 110 outputs a feedback signal of the main valve 110, and inputs the feedback signal to the detection circuit 130. The solenoid valve detection signal is determined by the detection circuit 130 according to the feedback signal, thereby determining whether the main valve 110 is in a normal operation state.

Fig. 4 is a schematic structural diagram of a detection circuit 130 according to an embodiment of the present invention, and with continued reference to fig. 1 and fig. 4, on the basis of the foregoing embodiment, the detection circuit 130 includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fifth triode T5, a main valve resistor Rz, and at least one segment valve resistor Rf;

a first end of the main valve resistor Rz is electrically connected to a first end of the main valve 110, a second end of the main valve resistor Rz is electrically connected to a first end of the eleventh resistor R11 and a control end of the fifth transistor T5, a first end of the segment valve resistor Rf is electrically connected to the first end of the segment valve 120, a second end of the segment valve resistor Rf is electrically connected to a first end of the eleventh resistor R11 and a control end of the fifth transistor T5, a second end of the eleventh resistor R11 is grounded, a first end of the fifth transistor T5 is electrically connected to a first end of the twelfth resistor R12 and a first end of the thirteenth resistor R13, respectively, a second end of the twelfth resistor R12 is electrically connected to a power supply terminal VCC, a second end of the thirteenth resistor R13 is electrically connected to the signal input terminal of the control module 140, and a second end of the fifth triode T5 is grounded.

With continued reference to fig. 1, 2, 3, and 4, the first end of the main valve resistor Rz receives the feedback signal, and when the feedback signal is the voltage signal of the power supply terminal, the fifth transistor T5 is turned on, and at this time, the signal input end of the control module 140 receives a low level signal; the first end of the main valve resistor Rz receives the feedback signal, and when the feedback signal is not the voltage signal of the power supply terminal, the fifth transistor T5 is turned off, and at this time, the signal input end of the control module 140 receives a high level signal.

The first end of the segment valve resistor Rf receives the feedback signal, and when the feedback signal is a power supply terminal voltage signal, the fifth triode T5 is turned on, and at this time, the signal input end of the control module 140 receives a low level signal; the first end of the segment valve resistor Rf receives the feedback signal, and when the feedback signal is not the voltage signal of the power supply terminal, the fifth transistor T5 is turned off, and at this time, the signal input end of the control module 140 receives a high level signal.

Specifically, the eleventh resistor R11, the twelfth resistor R12, and the thirteenth resistor R13 are all used for limiting current, so as to protect the detection circuit 130. The main valve resistance Rz and the segment valve resistance Rf are used for voltage division.

For example, the main valve resistor Rz and the segment valve resistor Rf have a resistance value of 56K, the eleventh resistor R11 and the twelfth resistor R12 have a resistance value of 10K, and the thirteenth resistor R13 has a resistance value of 1K.

On the basis of the above embodiment, the electromagnetic valve control signal is a high level signal, the main valve driving circuit 111 or the segment valve driving circuit 121 receives the high level signal, outputs the feedback signal as a high level signal, the fifth transistor T5 is turned on, and the detection circuit 130 outputs the electromagnetic valve detection signal as a low level signal.

With continued reference to fig. 1, 2, and 4, if the solenoid valve is the segment valve 120, the control module 140 generates a high level solenoid valve control signal, the segment valve driving circuit 121 receives the high level solenoid valve control signal, the first transistor T1 in the segment valve driving circuit 121 is turned on, the control terminal of the second transistor T3 is a low level solenoid valve control signal, the second transistor T2 is turned on, the segment valve driving circuit 121 outputs the feedback signal as a high level signal through the first terminal of the segment valve 120, the detection circuit 130 receives the high level signal through the first terminal of the segment valve resistor Rf, the fifth transistor T5 is turned on, and the detection circuit 130 outputs a low level solenoid valve detection signal.

With continued reference to fig. 1, 3, and 4, if the solenoid valve is the main valve 110, the control module 140 generates the solenoid valve control signal as a high level signal, the main valve driving circuit 111 receives the high level signal, the third transistor T3 in the main valve driving circuit 110 is turned on, the control end of the fourth transistor T4 is a low level signal, the fourth transistor T4 is turned on, the main valve driving circuit 111 outputs the feedback signal as a high level signal through the first end of the main valve 110, the detection circuit 130 receives the high level signal through the first end of the main valve resistor Rz, the fifth transistor T5 is turned on, and the detection circuit 130 outputs the solenoid valve detection signal as a low level signal.

On the basis of the above embodiment, the electromagnetic valve control signal is a low level signal, the main valve driving circuit 111 or the segment valve driving circuit 121 receives the low level signal, outputs the feedback signal as a low level signal, the fifth triode T5 is turned off, and the detection circuit 130 outputs the electromagnetic valve detection signal as a high level signal.

With continued reference to fig. 1, 2, and 4, if the solenoid valve is the segment valve 120, the control module 140 generates the solenoid valve control signal as a low level signal, the segment valve driving circuit 121 receives the low level signal, the first transistor T1 in the segment valve driving circuit 121 is turned off, the second transistor T2 is turned off, and the segment valve driving circuit 121 outputs the feedback signal through the first end of the segment valve 120 according to the formulaThe obtained port voltage U of the segment valve 120 connected to the positive electrode of the first diode D1 only needs to reasonably control the resistance of the third resistor R3, then the detection circuit 130 can control the fifth triode T5 to be turned off, and the detection circuit 130 outputs a solenoid valve detection signal as a high level signal.

With continued reference to fig. 1, 3, and 4, if the solenoid valve is the main valve 110, the control module 140 generates the solenoid valve control signal as a low level signal, the main valve driving circuit 111 receives the low level signal, the third transistor T3 in the main valve driving circuit 111 is turned off, the fourth transistor T4 is turned off, and the main valve driving circuit 111 outputs the feedback signal through the first end of the main valve 110 according to the formulaThe obtained port voltage U between the main valve 110 and the positive electrode of the third diode D3 only needs to reasonably control the resistance of the tenth resistor R10, and the detection circuit 1The fifth transistor T5 can be controlled to be turned off by the control circuit 30, and the detection circuit 130 outputs the solenoid valve detection signal as a low level signal.

Fig. 5 is a schematic structural diagram of a solenoid valve control circuit according to an embodiment of the present invention, and with continued reference to fig. 1 and fig. 5, a main valve driving circuit 111 and a main valve 110 are electrically connected to a main valve resistor of a detection circuit 130 to achieve electrical connection with the detection circuit 130, a plurality of segment valve driving circuits 121 are electrically connected to a segment valve 120, and then electrically connected to the detection circuit 130 through segment valve resistors of the detection circuit 130. In the embodiment, the main valve 110 and the segment valve 120 are controlled in time sequence to detect various abnormal conditions of the main valve 110 and the segment valve 120 one by one, and when the normal opening, closing and abnormal fault of each main valve 110 and the segment valve 120 occur, the abnormal conditions are fed back to the control module 140 through the detection circuit 130 in time, so as to ensure the normal use of the gas water heater

It should be noted that, when the coil of the solenoid valve (i.e. the main valve or the solenoid valve) is burnt and broken, it can be understood that the main valve or the solenoid valve load is not also in this case, the corresponding solenoid valve resistance is infinite, at this time, the voltage U of the main valve or the segment valve is not affected by the control signal of the solenoid valve and is always kept at the power supply terminal voltage VCC, the fifth triode in the detection circuit is turned on, and the detection signal of the solenoid valve output by the detection circuit is a low-level signal.

According to the technical scheme of the embodiment of the invention, the electromagnetic valve feedback signal is integrated and superposed in an optimized control mode according to the load characteristic of the electromagnetic valve, and each path of electromagnetic valve is detected by adopting an independent pulse signal, namely, the output signal is respectively and independently controlled on the main valve and each sectional valve, so that the failure of the electromagnetic valve is accurately positioned. On the other hand, the electromagnetic valve detection circuit of the implementation has strong universality, and only one detection port resource of the detection circuit is needed even if the fire row number of the gas water heater is increased and the number of the sectional valves is increased, the running state of the electromagnetic valve can be fed back in real time, and the stability and the safety of the electromagnetic valve system are improved.

The embodiment of the invention also provides a circuit board which comprises the electromagnetic valve detection circuit provided by the embodiment of the invention.

According to the technical scheme of the embodiment of the invention, the electromagnetic valve detection circuit comprises a main valve, a main valve driving circuit electrically connected with the main valve, at least one sectional valve driving circuit electrically connected with the sectional valve, a detection circuit and a control module; the control module is respectively in communication connection with the main valve driving circuit and the segment valve driving circuit, and is used for generating an electromagnetic valve control signal and inputting the electromagnetic valve control signal to the main valve driving circuit or the segment valve driving circuit corresponding to the electromagnetic valve control signal so as to control the main valve driving circuit or the segment valve driving circuit to drive the corresponding main valve or the segment valve to be electrified and generate a feedback signal of the main valve or the segment valve; the detection circuit is respectively in communication connection with the main valve and at least one of the segment valves, the detection circuit is electrically connected with the control module, and the detection circuit is used for converting the feedback signal into an electromagnetic valve detection signal and feeding the electromagnetic valve detection signal back to the control module so as to control the control module to judge whether the main valve or the segment valve is in a normal operation state according to the electromagnetic valve detection signal. The problem of current scheme adopt to detect the mode alone to every solenoid valve of gas heater, its circuit is complicated with high costs, and need occupy controller singlechip port resource than more, transplantation sex is relatively poor is solved to realize that the solenoid valve trouble detects in real time accurately, guarantee gas heater's normal use.

The embodiment of the invention also provides a gas water heater, which comprises the circuit board provided by the embodiment of the invention, and the circuit board comprises the electromagnetic valve detection circuit provided by the embodiment of the invention.

According to the technical scheme of the embodiment of the invention, the electromagnetic valve detection circuit comprises a main valve, a main valve driving circuit electrically connected with the main valve, at least one sectional valve driving circuit electrically connected with the sectional valve, a detection circuit and a control module; the control module is respectively in communication connection with the main valve driving circuit and the segment valve driving circuit, and is used for generating an electromagnetic valve control signal and inputting the electromagnetic valve control signal to the main valve driving circuit or the segment valve driving circuit corresponding to the electromagnetic valve control signal so as to control the main valve driving circuit or the segment valve driving circuit to drive the corresponding main valve or the segment valve to be electrified and generate a feedback signal of the main valve or the segment valve; the detection circuit is respectively in communication connection with the main valve and at least one of the segment valves, the detection circuit is electrically connected with the control module, and the detection circuit is used for converting the feedback signal into an electromagnetic valve detection signal and feeding the electromagnetic valve detection signal back to the control module so as to control the control module to judge whether the main valve or the segment valve is in a normal operation state according to the electromagnetic valve detection signal. The problem of current scheme adopt to detect the mode alone to every solenoid valve of gas heater, its circuit is complicated with high costs, and need occupy controller singlechip port resource than more, transplantation sex is relatively poor is solved to realize that the solenoid valve trouble detects in real time accurately, guarantee gas heater's normal use.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.