阅读说明：本技术 电水壶状态检测电路及电水壶 (Electric kettle state detection circuit and electric kettle ) 是由 敬仕林 郑丰周 徐明燕 李俊锴 宁瀛锋 于 2021-01-13 设计创作，主要内容包括：本申请涉及一种电水壶状态检测电路及电水壶,在电水壶的壶身设置有多个状态检测器,同时在电水壶的底座设置有控制器以及与状态检测器对应的多个激励信号电路和多个状态采集电路。底座部分的多个激励信号电路和多个状态采集电路分别连接至控制器,当电水壶的壶身与底座耦合时,通过接通复用信号线路使得状态检测器和激励信号电路一一对应连接,并通过接通各个采集线路使得状态采集电路与状态检测器一一对应连接。通过上述方案,各个状态检测器的输入激励部分采用同一根复用信号线路,减少电水壶的壶身与底座进行耦合时的连接触点,从而有效减少电水壶耦合器件的尺寸。(The application relates to an electric kettle state detection circuit and an electric kettle, wherein a plurality of state detectors are arranged on a kettle body of the electric kettle, and a controller, a plurality of excitation signal circuits corresponding to the state detectors and a plurality of state acquisition circuits are arranged on a base of the electric kettle. The plurality of excitation signal circuits and the plurality of state acquisition circuits of the base part are respectively connected to the controller, when the kettle body of the electric kettle is coupled with the base, the state detectors and the excitation signal circuits are connected in a one-to-one correspondence mode through connecting the multiplexing signal circuits, and the state acquisition circuits and the state detectors are connected in a one-to-one correspondence mode through connecting the acquisition circuits. Through the scheme, the same multiplexing signal line is adopted by the input excitation part of each state detector, so that connecting contacts when the kettle body of the electric kettle is coupled with the base are reduced, and the size of a coupling device of the electric kettle is effectively reduced.)

1. An electric kettle condition detection circuit, comprising: a plurality of state detectors arranged on a kettle body of the electric kettle, a plurality of excitation signal circuits, a plurality of state acquisition circuits and a controller arranged on a base of the electric kettle, and a multiplexing signal circuit and a plurality of acquisition circuits for coupling the kettle body and the base,

the excitation signal circuits are respectively connected with the controller, the excitation signal circuits are respectively connected with a corresponding state detector through the same multiplexing signal line, the state detectors are respectively connected with corresponding state acquisition circuits through the acquisition lines, and the state acquisition circuits are respectively connected with the controller.

2. The electric kettle state detection circuit of claim 1, wherein the state detector comprises a water level detector and a temperature detector, the excitation signal circuit comprises a water level excitation signal circuit and a temperature signal excitation circuit, the state acquisition circuit comprises a water level acquisition circuit and a temperature acquisition circuit, the acquisition circuit comprises a water level acquisition circuit and a temperature acquisition circuit,

the water level excitation signal circuit and the temperature signal excitation circuit are respectively connected with the controller, the water level excitation signal circuit is connected with the water level detector through the multiplexing signal circuit, the temperature signal excitation circuit is connected with the temperature detector through the multiplexing signal circuit, the temperature detector is connected with the temperature acquisition circuit through the temperature acquisition circuit, the water level detector is connected with the water level acquisition circuit through the water level acquisition circuit, and the temperature acquisition circuit and the water level acquisition circuit are respectively connected with the controller.

3. The electric kettle state detection circuit of claim 2, wherein the temperature acquisition circuit comprises a first isolation circuit and a temperature sampling circuit, the water level acquisition circuit comprises a second isolation circuit and a water level sampling circuit,

the first isolation circuit is connected with the temperature detector through the temperature acquisition circuit, the first isolation circuit is connected with the temperature sampling circuit, and the temperature sampling circuit is connected with the controller; the second isolation circuit is connected with the water level detector through the water level acquisition circuit, the second isolation circuit is connected with the water level sampling circuit, and the water level sampling circuit is connected with the controller.

4. The electric kettle state detection circuit of claim 3, wherein the temperature sampling circuit comprises a first diode, a first capacitor and a first resistor, one end of the first resistor is connected with the first isolation circuit and the anode of the first diode, one end of the first capacitor is connected with the other end of the first resistor, the other end of the first resistor is grounded, the other end of the first capacitor is connected with the anode of the first diode and the controller, and the cathode of the first diode is used for connecting an external power supply.

5. The electric kettle state detection circuit of claim 4, wherein the temperature sampling circuit further comprises a first current limiting resistor, one end of the first current limiting resistor is connected to the other end of the first capacitor, and the other end of the first current limiting resistor is connected to the controller.

6. The electric kettle state detection circuit of claim 3, wherein the water level sampling circuit comprises a second diode, a second capacitor and a second resistor, one end of the second resistor is connected with the second isolation circuit and the anode of the second diode, one end of the second capacitor is connected with the other end of the second resistor, the other end of the second resistor is grounded, the other end of the second capacitor is connected with the anode of the second diode and the controller, and the cathode of the second diode is used for connecting an external power supply.

7. The electric kettle state detection circuit of claim 6, wherein the water level sampling circuit further comprises a second current limiting resistor, one end of the second current limiting resistor is connected to the other end of the second capacitor, and the other end of the second current limiting resistor is connected to the controller.

8. An electric kettle state detection circuit as claimed in any one of claims 3 to 7, wherein said first isolation circuit comprises a third diode, said second isolation circuit comprises a fourth diode, the cathode of said third diode is connected to said temperature sampling circuit, the anode of said third diode is connected to said temperature detector through said temperature sampling line, the cathode of said fourth diode is connected to said water level sampling circuit, and the anode of said fourth diode is connected to said water level detector through said water level sampling line.

9. The electric kettle state detection circuit of claim 2, wherein the temperature signal excitation circuit comprises a third resistor and a switch tube, one end of the third resistor is connected to the controller, the other end of the third resistor is connected to the control end of the switch tube, the input end of the switch tube is connected to an external power supply, and the output end of the switch tube is connected to the temperature detector through the multiplexed signal line.

10. An electric kettle state detection circuit as claimed in claim 2, wherein said temperature detector is a thermistor and said water level detector is a water level probe.

11. An electric kettle comprising the electric kettle state detection circuit of any one of claims 1 to 10.

Technical Field

The application relates to the technical field of household appliances, in particular to an electric kettle state detection circuit and an electric kettle.

Background

With the development of science and technology and the continuous improvement of people's living standard, electric kettle uses more and more extensively in people's daily life, and the function of various electric kettles is also more and more intelligent and diversified. Many existing electric kettles have intelligent water boiling and automatic water inlet functions, and in order to realize the functions, the electric kettle must have the capabilities of detecting water temperature and detecting water level signals.

In the conventional water temperature and water level signal detection scheme, the water level and water temperature detectors are connected to the controller for detection through independent signal lines, which requires that the coupler between the kettle body and the base has independent connecting contacts and metal rings. The coupler needs to design a plurality of connecting contacts such as connecting wires at two ends of a zero line, a live line and a temperature sensing bulb for detecting water temperature, a water level signal transmitting and receiving connecting wire, if high and low water level detection is carried out, two water level receiving wires are needed, at the moment, 7 contacts and 7 metal rings are needed totally, and the size of the coupler is overlarge.

Disclosure of Invention

Therefore, it is necessary to provide an electric kettle state detection circuit and an electric kettle aiming at the problem that the conventional electric kettle coupler is oversized.

An electric kettle condition detection circuit comprising: the electric kettle comprises a plurality of state detectors arranged on a kettle body of the electric kettle, a plurality of excitation signal circuits, a plurality of state acquisition circuits and a controller arranged on a base of the electric kettle, and a multiplexing signal circuit and a plurality of acquisition circuits for coupling the kettle body and the base, wherein each excitation signal circuit is respectively connected with the controller, each excitation signal circuit is respectively connected with a corresponding state detector through the same multiplexing signal circuit, each state detector is respectively connected with the corresponding state acquisition circuit through one acquisition circuit, and each state acquisition circuit is respectively connected with the controller.

In one embodiment, the state detector includes a water level detector and a temperature detector, the excitation signal circuit includes a water level excitation signal circuit and a temperature signal excitation circuit, the state acquisition circuit comprises a water level acquisition circuit and a temperature acquisition circuit, the acquisition circuit comprises a water level acquisition circuit and a temperature acquisition circuit, the water level excitation signal circuit and the temperature signal excitation circuit are respectively connected with the controller, the water level excitation signal circuit is connected with the water level detector through the multiplexing signal line, the temperature signal excitation circuit is connected with the temperature detector through the multiplexing signal line, the temperature detector is connected with the temperature acquisition circuit through the temperature acquisition circuit, the water level detector is connected with the water level acquisition circuit through the water level acquisition circuit, and the temperature acquisition circuit and the water level acquisition circuit are respectively connected with the controller.

In one embodiment, the temperature acquisition circuit comprises a first isolation circuit and a temperature sampling circuit, the water level acquisition circuit comprises a second isolation circuit and a water level sampling circuit, the first isolation circuit is connected with the temperature detector through the temperature acquisition circuit, the first isolation circuit is connected with the temperature sampling circuit, and the temperature sampling circuit is connected with the controller; the second isolation circuit is connected with the water level detector through the water level acquisition circuit, the second isolation circuit is connected with the water level sampling circuit, and the water level sampling circuit is connected with the controller.

In one embodiment, the temperature sampling circuit comprises a first diode, a first capacitor and a first resistor, one end of the first resistor is connected with the first isolation circuit and the anode of the first diode, one end of the first capacitor is connected with the other end of the first resistor, the other end of the first resistor is grounded, the other end of the first capacitor is connected with the anode of the first diode and the controller, and the cathode of the first diode is used for being connected with an external power supply.

In one embodiment, the temperature sampling circuit further includes a first current limiting resistor, one end of the first current limiting resistor is connected to the other end of the first capacitor, and the other end of the first current limiting resistor is connected to the controller.

In one embodiment, the water level sampling circuit comprises a second diode, a second capacitor and a second resistor, one end of the second resistor is connected with the second isolation circuit and the anode of the second diode, one end of the second capacitor is connected with the other end of the second resistor, the other end of the second resistor is grounded, the other end of the second capacitor is connected with the anode of the second diode and the controller, and the cathode of the second diode is used for being connected with an external power supply.

In one embodiment, the water level sampling circuit further includes a second current limiting resistor, one end of the second current limiting resistor is connected to the other end of the second capacitor, and the other end of the second current limiting resistor is connected to the controller.

In one embodiment, the first isolation circuit comprises a third diode, the second isolation circuit comprises a fourth diode, a cathode of the third diode is connected with the temperature sampling circuit, an anode of the third diode is connected with the temperature detector through the temperature collecting line, a cathode of the fourth diode is connected with the water level sampling circuit, and an anode of the fourth diode is connected with the water level detector through the water level collecting line.

In one embodiment, the temperature signal excitation circuit comprises a third resistor and a switching tube, one end of the third resistor is connected with the controller, the other end of the third resistor is connected with the control end of the switching tube, the input end of the switching tube is connected with an external power supply, and the output end of the switching tube is connected with the temperature detector through the multiplexing signal line.

In one embodiment, the temperature detector is a thermistor and the water level detector is a water level probe.

An electric kettle comprises the electric kettle state detection circuit.

According to the electric kettle state detection circuit and the electric kettle, the kettle body of the electric kettle is provided with the plurality of state detectors, and the base of the electric kettle is provided with the controller, the plurality of excitation signal circuits corresponding to the state detectors and the plurality of state acquisition circuits. The plurality of excitation signal circuits and the plurality of state acquisition circuits of the base part are respectively connected to the controller, when the kettle body of the electric kettle is coupled with the base, the state detectors and the excitation signal circuits are connected in a one-to-one correspondence mode through connecting the multiplexing signal circuits, and the state acquisition circuits and the state detectors are connected in a one-to-one correspondence mode through connecting the acquisition circuits. Through the scheme, the same multiplexing signal line is adopted by the input excitation part of each state detector, so that connecting contacts when the kettle body of the electric kettle is coupled with the base are reduced, and the size of a coupling device of the electric kettle is effectively reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a circuit for detecting the status of an electric kettle according to an embodiment;

FIG. 2 is a schematic diagram of a circuit for detecting the status of an electric kettle in another embodiment;

FIG. 3 is a schematic view of a conventional electric kettle;

FIG. 4 is a schematic diagram of a conventional electric kettle for detecting the state;

FIG. 5 is a schematic diagram of a circuit for detecting the status of an electric kettle in another embodiment;

FIG. 6 is a schematic diagram of a circuit for detecting the status of an electric kettle in another embodiment;

FIG. 7 is a schematic diagram of a water level excitation signal circuit according to an embodiment.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Referring to fig. 1, a circuit for detecting the state of an electric kettle includes: the electric kettle comprises a plurality of state detectors 100 arranged on a kettle body 1 of the electric kettle, a plurality of excitation signal circuits 300 arranged on a base 2 of the electric kettle, a plurality of state acquisition circuits 200 and a controller 700, and a multiplexing signal line 3 and a plurality of acquisition lines 400 for coupling the kettle body 1 and the base 2, wherein each excitation signal circuit 300 is respectively connected with the controller 700, each excitation signal circuit 300 is respectively connected with a corresponding state detector 100 through the same multiplexing signal line 3, each state detector 100 is respectively connected with a corresponding state acquisition circuit 200 through an acquisition line 400, and each state acquisition circuit 200 is respectively connected with the controller 700.

Specifically, the excitation signal circuits 300, the state detectors 100 and the state acquisition circuits 200 are in one-to-one correspondence, each state detector 100 has a corresponding excitation signal circuit 300 to input an excitation signal to control the on and off of the state detector 100, and meanwhile, each state detector 100 has a corresponding state acquisition circuit 200 to perform corresponding detection state data acquisition. In this embodiment, the acquisition lines 400 are provided in a plurality, each state acquisition circuit 200 is connected to a corresponding state detector 100 through one acquisition line 400, and the input excitation part of each state detector 100 is input through only one multiplexing signal line 3. According to the scheme of the embodiment, the input lines of the state detectors 100 are multiplexed, the number of the input lines of the state detectors 100 is effectively reduced, and the purpose of reducing the size of the coupler between the kettle body 1 and the base 2 of the electric kettle is further achieved.

It should be noted that the number of the state detectors 100, the excitation signal circuits 300, the state acquisition circuits 200 and the acquisition lines 400 is not unique, and the specific number of the corresponding state detectors 100, the excitation signal circuits 300, the state acquisition circuits 200 and the acquisition lines 400 may be different according to the functions implemented by the electric kettle. For example, in one embodiment, when the electric kettle has functions of water level detection, water quality detection and temperature detection, the number of the corresponding state detector 100, the corresponding excitation signal circuit 300, the corresponding state acquisition circuit 200 and the corresponding acquisition line 400 is three. In another embodiment, if the electric kettle has two basic functions of water level detection and water temperature detection, the number of the corresponding state detectors 100, the corresponding excitation signal circuits 300, the corresponding state acquisition circuits 200, and the corresponding acquisition lines 400 is two.

In order to facilitate understanding of the embodiments of the present application, the following explanation is made by taking water level detection and water temperature detection of the electric kettle as specific embodiments. Correspondingly, please refer to fig. 2 in combination, in the present embodiment, the state detector 100 includes a water level detector 20 and a temperature detector 10, the excitation signal circuit 200 includes a water level excitation signal circuit 60 and a temperature signal excitation circuit 40, the state acquisition circuit 300 includes a water level acquisition circuit 50 and a temperature acquisition circuit 40, the acquisition circuit 400 includes a temperature acquisition circuit 4 and a water level acquisition circuit 5, the water level excitation signal circuit 60 and the temperature signal excitation circuit 30 are respectively connected to the controller 70, the water level excitation signal circuit 60 is connected to the water level detector 20 through a multiplexing signal line 3, the temperature signal excitation circuit 30 is connected to the temperature detector 10 through a multiplexing signal line 3, the temperature detector 10 is connected to the temperature acquisition circuit 40 through the temperature acquisition circuit 4, the water level detector 20 is connected to the water level acquisition circuit 50 through the water level acquisition circuit 5, and the temperature acquisition circuit 40 and the water level acquisition circuit 50 are respectively connected to the.

Specifically, the electric kettle comprises a kettle body 1 and a base 2, wherein the kettle body 1 is mainly used for storing water to be heated, and the base 2 is used for being connected with a power supply, an integrated control circuit and a heating device. Meanwhile, in order to facilitate intelligent control of the electric kettle, the kettle body 1 of the electric kettle is further provided with a temperature detector 10 and a water level detector 20 to respectively obtain the temperature and the water quantity of the water inside the kettle body 1. The water level excitation signal circuit 60 is a circuit for outputting an excitation signal required for the water level detector 20 to start operation, and the temperature signal excitation circuit 30 is a circuit for outputting an excitation signal required for the temperature detector 10 to start operation, and is mainly used for providing corresponding operating voltages for the temperature detector 10 and the water level detector 20. When the temperature of the water heated in the electric kettle changes, the temperature detector 10 has certain parameters, and the temperature acquisition circuit 40 connected with the temperature detector is used for acquiring the parameter change of the temperature detector 10 and sending the parameter change to the controller 70, so as to achieve the purpose of temperature detection. Similarly, the water level detector 20 is matched with the water level acquisition circuit 50, so that the real-time water level data inside the electric kettle can be obtained, and the intelligent control of the electric kettle is facilitated.

In the above embodiment, the body 1 of the electric kettle is provided with the temperature detector 10 and the water level detector 20, and the base 2 of the electric kettle is provided with the water level excitation signal circuit 60, the temperature signal excitation circuit 30, the temperature acquisition circuit 40, the water level acquisition circuit 50 and the controller 70. The water level excitation signal circuit 60, the temperature signal excitation circuit 30, the temperature acquisition circuit 40 and the water level acquisition circuit 50 of the base 2 part are respectively connected to the controller 70, when the kettle body 1 of the electric kettle is coupled with the base 2, the temperature detector 10 is connected with the temperature signal excitation circuit 30 by connecting the multiplexing signal circuit 3, the water level detector 20 is connected with the water level excitation signal circuit 60, the temperature detector 10 is connected with the temperature acquisition circuit 40 by connecting the temperature acquisition circuit 4, and the water level collector 20 is connected with the water level acquisition circuit 50 by connecting the water level acquisition circuit 50. When the controller 70 controls the temperature signal excitation circuit to work through the multiplexing signal line 3, the temperature detector 10 starts to operate, and the temperature acquisition circuit 40 acquires a signal of the temperature detector 10 and sends the signal to the controller 70, so that the water temperature acquisition of the electric kettle is realized. When the controller 70 controls the water level excitation signal circuit to work through the multiplex signal circuit 3, the water level detector 20 starts to operate, and the water level acquisition circuit 50 acquires a signal of the water level detector 20 and sends the signal to the controller 70, so that water level acquisition of the electric kettle is realized. Through the scheme, the same multiplexing signal line 3 is adopted for input excitation of the water level detector 20 and the temperature detector 10, connecting contacts of the electric kettle when the kettle body 1 is coupled with the base 2 are reduced, and therefore the size of a coupling device of the electric kettle is effectively reduced.

Please refer to fig. 3 in combination, when the conventional electric kettle has high and low water level probes, the coupler of the kettle body and the base part needs to be provided with 7 sets of contacts to realize the intelligent control of the electric kettle, so as to respectively realize the connection of the metal kettle body, the two ends of the heating plate, the two ends of the thermal bulb and the high and low water level probes, which makes the size of the coupler of the electric kettle larger, and at this time, not only the cost of the electric kettle is increased, but also the manufacturing process of the coupler becomes more complicated. As shown in fig. 4, when the electric kettle realizes the functions of temperature acquisition and water level acquisition, four groups of connection contacts are required, wherein a sensor 1 and a detection circuit 1 for acquiring water temperature are in one group, a sensor 2 and a detection circuit 2 for acquiring water level are in one group, a circuit for generating an excitation signal 1 to control the sensor 1 to start and operate and the sensor 1 are in one group, and finally a circuit for generating an excitation signal 2 to control the sensor 2 to start and operate and the sensor 2 are in one group. Therefore, four sets of contacts are correspondingly arranged on the coupler to realize connection.

According to the scheme of the embodiment, under the condition that the kettle body 1 of the electric kettle is separated from the base 2, the temperature detector 10 and the water level detector 20 are disconnected from the water level excitation signal circuit 60, the temperature signal excitation circuit 30, the temperature acquisition circuit 40 and the water level acquisition circuit 50 of the base 2, that is, the connection of the multiplexing signal line 3 is disconnected, the connection of the temperature acquisition line 4 is disconnected, and meanwhile, the connection of the water level acquisition line 5 is disconnected. When the kettle body 1 is arranged on the base 2, the lines are reconnected to form a closed loop, and the real-time water temperature and water level detection operation of the electric kettle is realized.

It can be understood that, in order to facilitate the connection between the device of the kettle body 1 part of the electric kettle and the device of the base 2 part of the electric kettle, the coupling devices are arranged on the bottom of the kettle body 1 of the electric kettle and the base 2, one part of the coupling devices is arranged on the kettle body 1, the other part of the coupling devices is arranged on the base 2, and when the electric kettle is used, the kettle body 1 only needs to be placed on the base 2, so that the coupling devices of the two parts can be coupled.

For example, referring to FIG. 5, in one embodiment, the multiplexed signal line 3 includes a coupling device contact X1-1 disposed on one side of the water level driving signal circuit 60 and the temperature signal driving circuit 30, and a coupling device contact X2-1 disposed on one side of the water level detector 20 and the temperature detector 10; when the kettle body 1 is separated from the base 2, the connection between the X1-1 and the X2-1 is disconnected, and when the kettle body 1 is placed on the base 2, the X1-1 is in contact connection with the X2-1. The temperature acquisition circuit 4 comprises a coupling device contact X1-2 arranged on one side of the temperature sampling circuit 40 and a coupling device contact X2-2 arranged on one side of the temperature detector 10; when the kettle body 1 is separated from the base 2, the connection between the X1-2 and the X2-2 is disconnected, and when the kettle body 1 is placed on the base 2, the X1-2 is in contact connection with the X2-2. The water level collection circuit 5 comprises a coupling contact X1-3 arranged on one side of the water level collection circuit 50 and a coupling contact X2-3 arranged on one side of the water level detector 20, when the kettle body 1 is separated from the base 2, the connection between the X1-3 and the X2-3 is disconnected, and when the kettle body 1 is placed on the base 2, the X1-3 and the X2-3 are in contact connection.

Referring to fig. 5, in an embodiment, the temperature acquisition circuit 40 includes a first isolation circuit 41 and a temperature sampling circuit 42, the water level acquisition circuit 50 includes a second isolation circuit 51 and a water level sampling circuit 52, the first isolation circuit 41 is connected to the temperature detector 10 through the temperature acquisition circuit 4, the first isolation circuit 41 is connected to the temperature sampling circuit 42, and the temperature sampling circuit 42 is connected to the controller 70; the second isolation circuit 51 is connected with the water level detector 20 through the water level collection line 5, the second isolation circuit 51 is connected with the water level sampling circuit 52, and the water level sampling circuit 52 is connected with the controller 70.

Specifically, in this embodiment, the temperature collection circuit 40 includes an isolation portion and a sampling portion with the water level collection circuit 50, and through the isolation circuit, the water level detection can be isolated when the water temperature is detected, or the water level detection operation can be isolated when the water level is detected, so as to avoid the mutual influence between the temperature collection circuit 42 and the water level collection circuit 52, and ensure the accuracy of the water level sampling and the water temperature sampling operation.

Further, referring to fig. 6, in an embodiment, the temperature sampling circuit 42 includes a first diode D1, a first capacitor C1 and a first resistor R1, one end of the first resistor R1 is connected to the first isolation circuit 41 and the anode of the first diode D1, one end of the first capacitor C1 is connected to the other end of the first resistor R1, the other end of the first resistor R1 is grounded, the other end of the first capacitor C1 is connected to the anode of the first diode D1 and the controller 70, and the cathode of the first diode D1 is used for connecting an external power source.

Specifically, the NTC-AD port is used for being connected to an IO port of the controller 70, and sending the AD signal obtained by sampling to the controller 70 to perform intelligent control of the electric kettle. In the embodiment, the first capacitor C1 and the first resistor R1 form an RC sampling circuit to implement the water temperature sampling operation, wherein the first diode D1 is a clamping diode of the IO port between the controller 70 and the water temperature sampling circuit and is used for protecting the temperature sampling circuit 42. It is understood that the specific structure of the temperature sampling circuit 42 is not exclusive and is not limited to the RC sampling circuit in this embodiment, and other types of sampling circuits may be adopted as long as the signal related to the water temperature can be acquired.

Further, in an embodiment, referring to fig. 6, the temperature sampling circuit 42 further includes a first current limiting resistor R4, one end of the first current limiting resistor R4 is connected to the other end of the first capacitor C1, and the other end of the first current limiting resistor R4 is connected to the controller 70.

Specifically, in this embodiment, a first current resistor is further disposed between the other end of the first capacitor C1 and the controller 70, so as to further ensure the operational reliability of the circuit. Due to the existence of the first capacitor C1 in the temperature sampling circuit 42, the first current limiting resistor R4 can prevent the first capacitor C1 from charging and causing excessive surge current to damage the IO port of the controller 70 connected with the first capacitor C1.

Referring to fig. 6, in an embodiment, the water level sampling circuit 52 includes a second diode D2, a second capacitor C2 and a second resistor R2, one end of the second resistor R2 is connected to the second isolation circuit 51 and the anode of the second diode D2, one end of the second capacitor C2 is connected to the other end of the second resistor R2, the other end of the second resistor R2 is grounded, the other end of the second capacitor C2 is connected to the anode of the second diode D2 and the controller 70, and the cathode of the second diode D2 is used for connecting an external power source.

Similarly, the WATER-AD port is used for being connected to an IO port of the controller 70, and sending the AD signal obtained by sampling to the controller 70 to perform intelligent control of the electric kettle. In the present embodiment, the second capacitor C2 and the second resistor R2 form an RC sampling circuit to implement the water level sampling operation, wherein the second diode D2 is a clamping diode of the IO port between the controller 70 and the water level sampling circuit 52 for protecting the water level sampling circuit 52. It is understood that the specific structure of the water level sampling circuit 52 is not exclusive, and is not limited to the RC sampling circuit in this embodiment, and other types of sampling circuits may be adopted as long as the water level related signal can be acquired.

Further, referring to fig. 6, in an embodiment, the water level sampling circuit 52 further includes a second current limiting resistor R5, one end of the second current limiting resistor R5 is connected to the other end of the second capacitor C2, and the other end of the second current limiting resistor R5 is connected to the controller 70.

Similarly, in this embodiment, a second current resistor is further disposed between the other end of the second capacitor C2 and the controller 70, so as to further ensure the operational reliability of the circuit. Due to the existence of the second capacitor C2 in the water level sampling circuit 52, the second current limiting resistor R5 can prevent the second capacitor C2 from charging and causing the excessive surge current to damage the IO port of the controller 70 connected with the second capacitor C2.

It is understood that the type of the isolation circuit is not exclusive, and referring to fig. 6, in one embodiment, the first isolation circuit 41 includes a third diode D3, the second isolation circuit 51 includes a fourth diode D4, a cathode of the third diode D3 is connected to the temperature sampling circuit 42, an anode of the third diode D3 is connected to the temperature detector 10 through the temperature collecting line 4, a cathode of the fourth diode D4 is connected to the water level sampling circuit 52, and an anode of the fourth diode D4 is connected to the water level detector 20 through the water level collecting line 5.

Specifically, the diode is used as the isolation circuit in the present embodiment, when the controller 70 controls the electric kettle state detection circuit to be in the water level detection state, the controller 70 also inputs a high level through the NTC-AD port of the temperature sampling circuit 42, so that the third diode D3 is turned off in the reverse direction, and the first resistor R1 is prevented from affecting the voltage during water level detection. Similarly, when the controller 70 controls the electric kettle state detection circuit to be in the temperature detection state, the controller 70 also inputs a high level through the WATER-AD port of the WATER level sampling circuit 52, so that the fourth diode D4 is turned off in the reverse direction, and the second resistor R2 is prevented from affecting the voltage during temperature detection.

Referring to fig. 6, in an embodiment, the temperature signal excitation circuit 30 includes a third resistor R3 and a switch Q1, one end of the third resistor R3 is connected to the controller 70, the other end of the third resistor R3 is connected to the control end of the switch Q1, the input end of the switch Q1 is connected to the external power source, and the output end of the switch Q1 is connected to the temperature detector 10 through the temperature multiplexing signal line 3.

Specifically, the present embodiment employs a switch circuit to implement the excitation signal sending operation of the temperature detector 10, and the switch circuit specifically includes a third resistor R3 and a switch Q1, wherein the third resistor R3 is disposed between the control end of the switch Q1 and the controller 70, and a signal output by the controller 70 flows into the switch Q1 after passing through the third resistor R3 to control the on/off of the switch Q1, so that the power supply at the input end of the switch Q1 can flow to the temperature detector 10 through the output end, or the connection between the temperature detector 10 and the power supply is disconnected.

It is to be understood that the specific type of the switching transistor Q1 is not exclusive, and may be a MOS transistor, a transistor, or other devices having a switching function. For example, in one embodiment, the switching tube Q1 is a PNP transistor, and when the controller 70 outputs a low level to the POWER-IO terminal to the PNP transistor, the PNP transistor is turned on so that the external POWER VCC can flow to the output terminal of the PNP transistor, and when the kettle body 1 of the electric kettle is placed on the base 2, the corresponding POWER VCC will flow to the temperature detector 10 to activate the temperature detector 10 to start operating.

It should be noted that the specific type of the water level excitation signal circuit 60 is not exclusive, as long as it can output a signal to excite the water level detector 20 to perform water level detection. For example, in one embodiment, referring to fig. 7 in combination, the water level activation signal circuit 60 includes: the water level detection circuit comprises a third capacitor C3, a first switch circuit 61, a second switch circuit 62, a fourth resistor R7 and a fifth resistor R8, wherein control ends of the first switch circuit 61 and the second switch circuit 62 are respectively connected with the controller 70, an input end of the first switch circuit 61 is connected with an external direct current power supply, an output end of the first switch circuit 61 is connected with one end of the fourth resistor R7, the other end of the fourth resistor R7 is connected with one end of the fifth resistor R8, the other end of the fifth resistor R8 is connected with an input end of the second switch circuit 62, an output end of the second switch circuit 62 is grounded, one end of the third capacitor C3 is connected with one end of the fifth resistor R8 and is connected to the water level detector 20 through a multiplexing signal line, and the other end of the third capacitor C3 is connected with an output end of the second switch circuit 62. Through the scheme of the embodiment, the charging and discharging of the third capacitor C3 can be controlled by controlling the on-off period of the first switch circuit 61 and the second switch circuit 62, and finally a dc power supply is used to provide a high-frequency ac excitation signal for the water level detector 20.

Referring to fig. 6, in one embodiment, the temperature detector 10 is a thermistor R6, and the water level detector 20 is a water level probe T.

Specifically, one end of the thermistor R6 is connected to the temperature signal excitation circuit 30 through the multiplexed signal line 3, and the other end of the thermistor R6 is connected to the temperature acquisition circuit 40 through the temperature acquisition line 4; the water level probe T is connected to the water level excitation signal circuit 60 through the multiplex signal line 3, and the water level probe T is connected to the water level collection circuit 50 through the water level collection line 5. This embodiment is equivalent to an electric capacity CP with kettle body 1 of insulating pot, and when the water level of insulating pot changed, the capacitance value of equivalent electric capacity CP changed, utilizes this change of probe collection, can finally obtain the water level state of insulating pot.

To facilitate understanding of various embodiments of the present application, the present application is explained below in conjunction with a specific electric kettle state detection circuit configuration. Referring to fig. 6, in a more detailed embodiment, the electric kettle status detection circuit includes the features shown in the above embodiments. When the POWER-IO port of the controller 70 outputs a low level and the WATER-C port does not output a corresponding control signal, the switch tube Q1 is in a conducting state under the control of the low level. The power supply voltage VCC at the input end of the switch tube Q1 is loaded to the thermistor R6 of the kettle body 1, the thermistor R6 and the first resistor R1 divide the voltage of VCC, and the controller 70 detects the voltage value at the R1 through the NTC-AD port and analyzes the voltage value, so that the temperature value of the water in the kettle body 1 can be obtained; meanwhile, the controller 70 outputs a high level to the WATER-AD port so that the fourth diode D4 is turned off in the reverse direction, thereby preventing the second resistor R2 from affecting the temperature detection voltage. When the controller 70 outputs a control signal related to WATER temperature detection and the control end of the switching tube Q1 outputs a high level, the switching tube Q1 is turned off, a WATER level signal is transmitted to the WATER level sampling circuit 52 through the WATER level probe T and the fifth switching tube Q1, and the controller 70 detects a voltage value at the second resistor R2 through the WATER-AD port to analyze, so that a corresponding WATER level state quantity can be obtained; meanwhile, the controller 70 outputs a high level to the NTC-AD port so that the third diode D3 is turned off in the reverse direction, thereby preventing the first resistor R1 from affecting the water level detection voltage.

According to the state detection circuit of the electric kettle, the kettle body of the electric kettle is provided with the plurality of state detectors, and the base of the electric kettle is provided with the controller, the plurality of excitation signal circuits and the plurality of state acquisition circuits, wherein the plurality of excitation signal circuits and the plurality of state acquisition circuits correspond to the state detectors. The plurality of excitation signal circuits and the plurality of state acquisition circuits of the base part are respectively connected to the controller, when the kettle body of the electric kettle is coupled with the base, the state detectors and the excitation signal circuits are connected in a one-to-one correspondence mode through connecting the multiplexing signal circuits, and the state acquisition circuits and the state detectors are connected in a one-to-one correspondence mode through connecting the acquisition circuits. Through the scheme, the same multiplexing signal line is adopted by the input excitation part of each state detector, so that connecting contacts when the kettle body of the electric kettle is coupled with the base are reduced, and the size of a coupling device of the electric kettle is effectively reduced.

An electric kettle comprises the electric kettle state detection circuit.

Specifically, the structure of the electric kettle state detection circuit is as shown in the above embodiments and the accompanying drawings, the electric kettle comprises a kettle body 1 and a base 2, the kettle body 1 is mainly used for storing water to be heated, and the base 2 is used for connecting a power supply, an integrated control circuit and a heating device. The electric kettle state detection circuit comprises a plurality of state detectors 100 arranged on a kettle body 1 of an electric kettle, a plurality of excitation signal circuits 300 arranged on a base 2 of the electric kettle, a plurality of state acquisition circuits 200 and a controller 700, and a multiplexing signal line 3 and a plurality of acquisition circuits 400 for coupling the kettle body 1 and the base 2, wherein each excitation signal circuit 300 is respectively connected with the controller 700, each excitation signal circuit 300 is respectively connected with a corresponding state detector 100 through the same multiplexing signal line 3, each state detector 100 is respectively connected with a corresponding state acquisition circuit 200 through an acquisition circuit 400, and each state acquisition circuit 200 is respectively connected with the controller 700.

The excitation signal circuits 300, the state detectors 100 and the state acquisition circuits 200 are in one-to-one correspondence, each state detector 100 has a corresponding excitation signal circuit 300 to input an excitation signal to control the start and the operation of the state detector, and meanwhile, each state detector 100 has a corresponding state acquisition circuit 200 to acquire corresponding detection state data. In this embodiment, the acquisition lines 400 are provided in a plurality, each state acquisition circuit 200 is connected to a corresponding state detector 100 through one acquisition line 400, and the input excitation part of each state detector 100 is input through only one multiplexing signal line 3. According to the scheme of the embodiment, the input lines of the state detectors 100 are multiplexed, the number of the input lines of the state detectors 100 is effectively reduced, and the purpose of reducing the size of the coupler between the kettle body 1 and the base 2 of the electric kettle is further achieved.

It should be noted that the number of the state detectors 100, the excitation signal circuits 300, the state acquisition circuits 200 and the acquisition lines 400 is not unique, and the specific number of the corresponding state detectors 100, the excitation signal circuits 300, the state acquisition circuits 200 and the acquisition lines 400 may be different according to the functions implemented by the electric kettle. For example, in one embodiment, when the electric kettle has functions of water level detection, water quality detection and temperature detection, the number of the corresponding state detector 100, the corresponding excitation signal circuit 300, the corresponding state acquisition circuit 200 and the corresponding acquisition line 400 is three. In another embodiment, if the electric kettle has two basic functions of water level detection and water temperature detection, the number of the corresponding state detectors 100, the corresponding excitation signal circuits 300, the corresponding state acquisition circuits 200, and the corresponding acquisition lines 400 is two.

In order to facilitate understanding of the embodiments of the present application, the following explanation is made by taking water level detection and water temperature detection of the electric kettle as specific embodiments. Accordingly, referring to fig. 2, in the present embodiment, the state detector 100 includes a water level detector 20 and a temperature detector 10, the excitation signal circuit 200 includes a water level excitation signal circuit 60 and a temperature signal excitation circuit 40, the state acquisition circuit 300 includes a water level acquisition circuit 50 and a temperature acquisition circuit 40, and the acquisition circuit 400 includes a temperature acquisition circuit 4 and a water level acquisition circuit 5.

In order to facilitate the intelligent control of the electric kettle, a temperature detector 10 and a water level detector 20 are further arranged on the kettle body 1 of the electric kettle to respectively obtain the temperature and the water quantity of the water inside the kettle body 1. The water level excitation signal circuit 60 is a circuit for outputting an excitation signal required for the water level detector 20 to start operation, and the temperature signal excitation circuit 30 is a circuit for outputting an excitation signal required for the temperature detector 10 to start operation, and is mainly used for providing corresponding operating voltages for the temperature detector 10 and the water level detector 20. When the temperature of the water heated in the electric kettle changes, the temperature detector 10 has certain parameters, and the temperature acquisition circuit 40 connected with the temperature detector is used for acquiring the parameter change of the temperature detector 10 and sending the parameter change to the controller 70, so as to achieve the purpose of temperature detection. Similarly, the water level detector 20 is matched with the water level acquisition circuit 50, so that the real-time water level data inside the electric kettle can be obtained, and the intelligent control of the electric kettle is facilitated.

Please refer to fig. 3 in combination, when the conventional electric kettle has high and low water level probes, the coupler of the kettle body and the base part needs to be provided with 7 sets of contacts to realize the intelligent control of the electric kettle, so as to respectively realize the connection of the metal kettle body, the two ends of the heating plate, the two ends of the thermal bulb and the high and low water level probes, which makes the size of the coupler of the electric kettle larger, and at this time, not only the cost of the electric kettle is increased, but also the manufacturing process of the coupler becomes more complicated. As shown in fig. 4, when the electric kettle 3 realizes the functions of temperature acquisition and water level acquisition, four groups of connection contacts are required, wherein a sensor 1 and a detection circuit 1 for acquiring water temperature are in one group, a sensor 2 and a detection circuit 2 for acquiring water level are in one group, a circuit for generating an excitation signal 1 to control the sensor 1 to start and operate and the sensor 1 are in one group, and finally a circuit for generating an excitation signal 2 to control the sensor 2 to start and operate and the sensor 2 are in one group. Therefore, four sets of contacts are correspondingly arranged on the coupler to realize connection.

According to the scheme of the embodiment, under the condition that the kettle body 1 of the electric kettle is separated from the base 2, the temperature detector 10 and the water level detector 20 are disconnected from the water level excitation signal circuit 60, the temperature signal excitation circuit 30, the temperature acquisition circuit 40 and the water level acquisition circuit 50 of the base 2, that is, the connection of the multiplexing signal line 3 is disconnected, the connection of the temperature acquisition line 4 is disconnected, and meanwhile, the connection of the water level acquisition line 5 is disconnected. When the kettle body 1 is arranged on the base 2, the lines are reconnected to form a closed loop, and the real-time water temperature and water level detection operation of the electric kettle is realized.

It can be understood that, in order to facilitate the connection between the device of the kettle body 1 part of the electric kettle and the device of the base 2 part of the electric kettle, the coupling devices are arranged on the bottom of the kettle body 1 of the electric kettle and the base 2, one part of the coupling devices is arranged on the kettle body 1, the other part of the coupling devices is arranged on the base 2, and when the electric kettle is used, the kettle body 1 only needs to be placed on the base 2, so that the coupling devices of the two parts can be coupled.

According to the electric kettle, the kettle body of the electric kettle is provided with the plurality of state detectors, and the base of the electric kettle is provided with the controller, the plurality of excitation signal circuits and the plurality of state acquisition circuits, wherein the plurality of excitation signal circuits and the plurality of state acquisition circuits correspond to the state detectors. The plurality of excitation signal circuits and the plurality of state acquisition circuits of the base part are respectively connected to the controller, when the kettle body of the electric kettle is coupled with the base, the state detectors and the excitation signal circuits are connected in a one-to-one correspondence mode through connecting the multiplexing signal circuits, and the state acquisition circuits and the state detectors are connected in a one-to-one correspondence mode through connecting the acquisition circuits. Through the scheme, the same multiplexing signal line is adopted by the input excitation part of each state detector, so that connecting contacts when the kettle body of the electric kettle is coupled with the base are reduced, and the size of a coupling device of the electric kettle is effectively reduced.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.