Electric kettle state detection circuit and electric kettle

Abstract

The present application relates to an electric kettle state detection circuit and an electric kettle, wherein a plurality of state detectors are arranged on the kettle body of the electric kettle, and a controller and a plurality of excitation signal circuits and a plurality of state acquisition circuits corresponding to the state detectors are arranged on the 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, and when the kettle body of the electric kettle is coupled with the base, the state detector and the excitation signal circuit are connected one-to-one by connecting the multiplexed signal line, and the state acquisition circuit and the state detector are connected one-to-one by connecting each acquisition line. Through the above scheme, the input excitation part of each state detector adopts the same multiplexed signal line, which reduces the connection contacts when the kettle body of the electric kettle is coupled with the base, thereby effectively reducing the size of the coupling device of the electric kettle.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to an electric kettle state detection circuit and an electric kettle. Background Art

[0002] With the development of science and technology and the continuous improvement of people's living standards, electric kettles are becoming more and more widely used in people's daily lives, and the functions of various electric kettles are becoming more and more intelligent and diversified. Many existing electric kettles have intelligent water boiling and automatic water filling functions. To realize these functions, electric kettles must be able to detect water temperature and water level signals.

[0003] In conventional water temperature and level signal detection solutions, the water level and temperature detectors are connected to the controller via independent signal lines. This requires the coupler between the kettle body and base to have independent connection contacts and metal rings. The coupler needs to be designed with multiple connection contacts, including the neutral wire, the live wire, the two end connection wires of the temperature sensor for detecting water temperature, and the water level signal transmission and reception connection wires. If high and low water level detection is required, two water level receiving wires are required. In this case, a total of seven contacts and seven metal rings are required, which will make the coupler too large. Summary of the Invention

[0004] Based on this, it is necessary to provide an electric kettle state detection circuit and an electric kettle to address the problem that the traditional electric kettle coupler is too large.

[0005] An electric kettle state detection circuit comprises: a plurality of state detectors arranged on the kettle body of the electric kettle, a plurality of excitation signal circuits, a plurality of state acquisition circuits and a controller arranged on the base of the electric kettle, and a multiplexed signal circuit and a plurality of acquisition circuits for coupling the kettle body and the base, wherein each of the excitation signal circuits is respectively connected to the controller, each of the excitation signal circuits is respectively connected to a corresponding state detector via the same multiplexed signal circuit, each of the state detectors is respectively connected to a corresponding state acquisition circuit via an acquisition circuit, and each of the state acquisition circuits is respectively connected to the controller.

[0006] 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 includes a water level acquisition circuit and a temperature acquisition circuit, the acquisition circuit includes 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 to the controller, the water level excitation signal circuit is connected to the water level detector through the multiplexed signal circuit, the temperature signal excitation circuit is connected to the temperature detector through the multiplexed signal circuit, the temperature detector is connected to the temperature acquisition circuit through the temperature acquisition circuit, the water level detector is connected to 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 to the controller.

[0007] In one embodiment, the temperature acquisition circuit includes a first isolation circuit and a temperature sampling circuit, and the water level acquisition circuit includes a second isolation circuit and a water level sampling circuit. The first isolation circuit is connected to the temperature detector through the temperature acquisition circuit, the first isolation circuit is connected to the temperature sampling circuit, and the temperature sampling circuit is connected to the controller; the second isolation circuit is connected to the water level detector through the water level acquisition circuit, the second isolation circuit is connected to the water level sampling circuit, and the water level sampling circuit is connected to the controller.

[0008] In one embodiment, the temperature sampling circuit includes a first diode, a first capacitor and a first resistor, one end of the first resistor is connected to the first isolation circuit and the anode of the first diode, one end of the first capacitor is connected to 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 to the anode of the first diode and the controller, and the cathode of the first diode is used to connect to an external power supply.

[0009] 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.

[0010] In one embodiment, the water level sampling circuit includes a second diode, a second capacitor and a second resistor, one end of the second resistor is connected to the second isolation circuit and the anode of the second diode, one end of the second capacitor is connected to 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 to the anode of the second diode and the controller, and the cathode of the second diode is used to connect to an external power supply.

[0011] 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.

[0012] In one embodiment, the first isolation circuit includes a third diode, the second isolation circuit includes a fourth diode, the cathode of the third diode is connected to the temperature sampling circuit, the anode of the third diode is connected to the temperature detector through the temperature acquisition circuit, the cathode of the fourth diode is connected to the water level sampling circuit, and the anode of the fourth diode is connected to the water level detector through the water level acquisition circuit.

[0013] In one embodiment, the temperature signal excitation circuit includes a third resistor and a switching 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 switching tube, the input end of the switching tube is connected to an external power supply, and the output end of the switching tube is connected to the temperature detector through the multiplexed signal line.

[0014] In one embodiment, the temperature detector is a thermistor, and the water level detector is a water level probe.

[0015] An electric kettle comprises the above-mentioned electric kettle state detection circuit.

[0016] The above-mentioned electric kettle state detection circuit and electric kettle have multiple state detectors installed on the kettle body, and a controller, multiple excitation signal circuits corresponding to the state detectors, and multiple state acquisition circuits installed on the base of the electric kettle. The multiple excitation signal circuits and multiple state acquisition circuits on the base are respectively connected to the controller. When the kettle body and the base are coupled, the state detectors and the excitation signal circuits are connected in a one-to-one correspondence by connecting the multiplexed signal lines, and the state acquisition circuits are connected in a one-to-one correspondence by connecting the various acquisition lines. Through this solution, the input excitation parts of each state detector use the same multiplexed signal line, reducing the number of connection contacts when coupling the kettle body and the base, thereby effectively reducing the size of the kettle's coupling components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 Schematic diagram of the electric kettle status detection circuit structure in one embodiment;

[0019] Figure 2 A schematic diagram of the structure of an electric kettle status detection circuit in another embodiment;

[0020] Figure 3 This is a schematic diagram of the structure of a traditional electric kettle;

[0021] Figure 4 This is a schematic diagram of the status detection of a traditional electric kettle;

[0022] Figure 5 A schematic diagram of the structure of an electric kettle status detection circuit in another embodiment;

[0023] Figure 6 A schematic diagram of the structure of a circuit for detecting a state of an electric kettle in another embodiment;

[0024] Figure 7 Schematic diagram of the water level excitation signal circuit structure in one embodiment. DETAILED DESCRIPTION

[0025] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0026] See also Figure 1 A state detection circuit for an electric kettle includes: a plurality of state detectors 100 disposed on a kettle body 1 of the electric kettle; a plurality of excitation signal circuits 300, a plurality of state acquisition circuits 200, and a controller 700 disposed on a base 2 of the electric kettle; and a multiplexing signal line 3 and a plurality of acquisition lines 400 for coupling the kettle body 1 and the base 2. Each excitation signal circuit 300 is respectively connected to the controller 700, each excitation signal circuit 300 is respectively connected to a corresponding state detector 100 via the same multiplexing signal line 3, each state detector 100 is respectively connected to a corresponding state acquisition circuit 200 via an acquisition line 400, and each state acquisition circuit 200 is respectively connected to the controller 700.

[0027] Specifically, the excitation signal circuit 300, the state detector 100, and the state acquisition circuit 200 correspond one-to-one. Each state detector 100 has a corresponding excitation signal circuit 300 that inputs an excitation signal to control its operation. Simultaneously, each state detector 100 has a corresponding state acquisition circuit 200 that collects corresponding detection state data. In this embodiment, multiple acquisition circuits 400 are provided, and each state acquisition circuit 200 is connected to the corresponding state detector 100 via an acquisition circuit 400. The input excitation portion of each state detector 100 is input via only one multiplexing signal line 3. This embodiment multiplexes the input lines of multiple state detectors 100, effectively reducing the number of input lines of the state detectors 100, thereby reducing the size of the coupler between the kettle body 1 and base 2.

[0028] It should be noted that the number of state detectors 100, excitation signal circuits 300, state acquisition circuits 200, and acquisition circuits 400 is not unique. Depending on the functions implemented by the electric kettle, the specific number of state detectors 100, excitation signal circuits 300, state acquisition circuits 200, and acquisition circuits 400 may also vary. For example, in one embodiment, when the electric kettle simultaneously has water level detection, water quality detection, and temperature detection functions, the number of state detectors 100, excitation signal circuits 300, state acquisition circuits 200, and acquisition circuits 400 is three. In another embodiment, when the electric kettle simultaneously has two basic functions of water level detection and water temperature detection, the number of state detectors 100, excitation signal circuits 300, state acquisition circuits 200, and acquisition circuits 400 is two.

[0029] In order to facilitate understanding of the various embodiments of this application, the following explanations are given using the water level detection and water temperature detection of the electric kettle as specific embodiments. Figure 2 In this 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 the multiplexing signal line 3, the temperature signal excitation circuit 30 is connected to the temperature detector 10 through the multiplexing signal line 3, the temperature detector 10 is connected to the temperature acquisition circuit 40 through the temperature acquisition line 4, the water level detector 20 is connected to the water level acquisition circuit 50 through the water level acquisition line 5, and the temperature acquisition circuit 40 and the water level acquisition circuit 50 are respectively connected to the controller 70.

[0030] Specifically, the electric kettle comprises a body 1 and a base 2. The body 1 primarily stores heated water, while the base 2 connects to a power source and integrates control circuitry and heating components. To facilitate intelligent control of the electric kettle, the body 1 is also equipped with a temperature detector 10 and a water level detector 20, which respectively detect the temperature and volume of the water within the body 1. The water level excitation signal circuit 60 outputs the excitation signal required to activate the water level detector 20, while the temperature signal excitation circuit 30 outputs the excitation signal required to activate the temperature detector 10. This circuit primarily provides operating voltages to the temperature detector 10 and the water level detector 20, respectively. When the temperature of the water heated within the kettle changes, the temperature detector 10's parameters change. The temperature acquisition circuit 40 connected to the temperature detector 10 monitors these parameter changes and transmits them to the controller 70, thereby achieving temperature detection. Similarly, the water level detector 20, in conjunction with the water level acquisition circuit 50, can obtain real-time water level data within the kettle, facilitating intelligent control of the kettle.

[0031] In the above embodiment, the body 1 of the electric kettle is provided with a temperature detector 10 and a water level detector 20, while the base 2 of the electric kettle is provided with a water level excitation signal circuit 60, a temperature signal excitation circuit 30, a temperature acquisition circuit 40, a water level acquisition circuit 50, and a 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 are respectively connected to the controller 70. When the body 1 of the electric kettle is coupled to the base 2, the temperature detector 10 is connected to the temperature signal excitation circuit 30, and the water level detector 20 is connected to the water level excitation signal circuit 60 by connecting the multiplexing signal line 3. The temperature detector 10 is connected to the temperature acquisition circuit 40 by connecting the temperature acquisition line 4, and the water level acquisition circuit 50 is connected to the water level acquisition circuit 50 by connecting the water level acquisition circuit 50. When the controller 70 controls the temperature signal excitation circuit via the multiplexed signal line 3, the temperature detector 10 begins operating, and the temperature acquisition circuit 40 acquires the signal from the temperature detector 10 and transmits it to the controller 70, thereby acquiring the water temperature of the electric kettle. Furthermore, when the controller 70 controls the water level excitation signal circuit via the multiplexed signal line 3, the water level detector 20 begins operating, and the water level acquisition circuit 50 acquires the signal from the water level detector 20 and transmits it to the controller 70, thereby acquiring the water level of the electric kettle. Through this solution, the input excitations for the water level detector 20 and the temperature detector 10 utilize the same multiplexed signal line 3, reducing the number of connection contacts when coupling the kettle body 1 and base 2, thereby effectively reducing the size of the kettle's coupling components.

[0032] Please refer to Figure 3When a conventional electric kettle has high and low water level probes, the coupler between the kettle body and the base needs to be equipped with 7 sets of contacts to achieve intelligent control of the kettle, respectively connecting the metal kettle body, the two ends of the heating plate, the two ends of the temperature sensor, and the high and low water level probes. This will make the coupler of the electric kettle larger, which will not only increase the cost of the electric kettle, but also make the manufacturing process of the coupler more complicated. Figure 4 As shown, an electric kettle requires four sets of connection contacts to implement temperature and water level acquisition. Sensor 1 for acquiring water temperature and detection circuit 1 form one set, sensor 2 for acquiring water level and detection circuit 2 form another set, the circuit for generating excitation signal 1 to control sensor 1's operation and sensor 1 form another set, and finally, the circuit for generating excitation signal 2 to control sensor 2's operation and sensor 2 form another set. Therefore, four sets of contacts are required on the coupler to achieve these connections.

[0033] In this embodiment, when the kettle body 1 is separated from the base 2, the connections between the temperature detector 10 and the water level detector 20 and the water level excitation signal circuit 60, temperature signal excitation circuit 30, temperature acquisition circuit 40, and water level acquisition circuit 50 on the base 2 are disconnected. Specifically, the multiplexed signal circuit 3, temperature acquisition circuit 4, and water level acquisition circuit 5 are disconnected. However, when the kettle body 1 is placed on the base 2, these circuits reconnect, forming a closed loop, enabling the electric kettle to detect the water temperature and water level in real time.

[0034] It can be understood that in order to facilitate the connection between the components of the kettle body 1 and the components of the base 2, a coupling component is provided on the bottom of the kettle body 1 and the base 2 of the electric kettle. One part of the coupling component is located on the kettle body 1, and the other part is located on the base 2. When in use, it is only necessary to place the kettle body 1 on the base 2 so that the two parts of the coupling component are coupled.

[0035] For example, see Figure 5In one embodiment, the multiplexing signal circuit 3 includes a coupling device contact X1-1 disposed on one side of the water level excitation signal circuit 60 and the temperature signal excitation 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 X1-1 and X2-1 is disconnected. When the kettle body 1 is placed on the base 2, X1-1 and X2-1 are in contact and connected. The temperature acquisition circuit 4 includes a coupling device contact X1-2 disposed on one side of the temperature sampling circuit 40, and a coupling device contact X2-2 disposed on one side of the temperature detector 10. When the kettle body 1 is separated from the base 2, the connection between X1-2 and X2-2 is disconnected. When the kettle body 1 is placed on the base 2, X1-2 and X2-2 are in contact and connected. The water level acquisition circuit 5 includes a coupling contact X1-3 arranged on one side of the water level acquisition 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 X1-3 and X2-3 is disconnected. When the kettle body 1 is placed on the base 2, X1-3 and X2-3 are in contact and connected.

[0036] See also Figure 5 In one embodiment, the temperature acquisition circuit 40 includes a first isolation circuit 41 and a temperature sampling circuit 42, and 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 to the water level detector 20 through the water level acquisition circuit 5, the second isolation circuit 51 is connected to the water level sampling circuit 52, and the water level sampling circuit 52 is connected to the controller 70.

[0037] Specifically, in this embodiment, the temperature acquisition circuit 40 and the water level acquisition circuit 50 both include an isolation part and a sampling part. Through the isolation circuit, the water level detection can be isolated during water temperature detection, or the water temperature detection operation can be isolated during water level detection to avoid mutual influence between the temperature sampling circuit 42 and the water level sampling circuit 52, thereby ensuring the accuracy of the water level sampling and water temperature sampling operations.

[0038] Further, please refer to Figure 6 In one 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. The cathode of the first diode D1 is used to connect to an external power supply.

[0039] Specifically, the NTC-AD port is used to connect to the IO port of the controller 70, sending the sampled AD signal to the controller 70 for intelligent control of the electric kettle. This embodiment uses a first capacitor C1 and a first resistor R1 to form an RC sampling circuit to implement water temperature sampling. The first diode D1 is a clamping diode at the IO port between the controller 70 and the water temperature sampling circuit, used to protect the temperature sampling circuit 42. It will be understood that the specific structure of the temperature sampling circuit 42 is not unique and is not limited to the RC sampling circuit of this embodiment. Other sampling circuits can also be used as long as they can collect signals related to water temperature.

[0040] Furthermore, in one embodiment, please refer to Figure 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 .

[0041] Specifically, this embodiment further includes a first current resistor between the other end of the first capacitor C1 and the controller 70 to further ensure circuit reliability. Due to the presence of the first capacitor C1 in the temperature sampling circuit 42, the provision of the first current-limiting resistor R4 prevents excessive inrush current during charging of the first capacitor C1, which could damage the IO port of the connected controller 70.

[0042] See also Figure 6 In one 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. The cathode of the second diode D2 is used to connect to an external power supply.

[0043] Similarly, the WATER-AD port is used to connect to the IO port of the controller 70, sending the sampled AD signal to the controller 70 for intelligent control of the electric kettle. This embodiment uses a second capacitor C2 and a second resistor R2 to form an RC sampling circuit to implement water level sampling. The second diode D2 is a clamping diode for the IO port between the controller 70 and the water level sampling circuit 52, used to protect the water level sampling circuit 52. It will be understood that the specific structure of the water level sampling circuit 52 is not unique and is not limited to the RC sampling circuit in this embodiment. Other sampling circuits can also be used as long as they can collect water level-related signals.

[0044] Further, please refer to Figure 6In one 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 .

[0045] Similarly, this embodiment further provides a second current-limiting resistor between the other end of the second capacitor C2 and the controller 70 to ensure circuit reliability. Due to the presence of the second capacitor C2 in the water level sampling circuit 52, the second current-limiting resistor R5 prevents excessive inrush current from charging the second capacitor C2, which could damage the IO port of the connected controller 70.

[0046] It is understood that there are not only one type of isolation circuit, please refer to Figure 6 In one embodiment, the first isolation circuit 41 includes a third diode D3, the second isolation circuit 51 includes a fourth diode D4, the cathode of the third diode D3 is connected to the temperature sampling circuit 42, the anode of the third diode D3 is connected to the temperature detector 10 through the temperature acquisition circuit 4, the cathode of the fourth diode D4 is connected to the water level sampling circuit 52, and the anode of the fourth diode D4 is connected to the water level detector 20 through the water level acquisition circuit 5.

[0047] Specifically, this embodiment uses a diode as an isolation circuit. 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, causing the third diode D3 to be reverse-blocked, thereby preventing the first resistor R1 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, causing the fourth diode D4 to be reverse-blocked, thereby preventing the second resistor R2 from affecting the voltage during temperature detection.

[0048] See also Figure 6 In one embodiment, the temperature signal excitation circuit 30 includes a third resistor R3 and a switch tube Q1. One end of the third resistor R3 is connected to the controller 70, and the other end of the third resistor R3 is connected to the control end of the switch tube Q1. The input end of the switch tube Q1 is connected to an external power supply, and the output end of the switch tube Q1 is connected to the temperature detector 10 through the temperature multiplexing signal line 3.

[0049] Specifically, this embodiment uses a switching circuit to implement the excitation signal sending operation of the temperature detector 10. The switching circuit specifically includes a third resistor R3 and a switch tube Q1, wherein the third resistor R3 is arranged between the control end of the switch tube Q1 and the controller 70. The signal output by the controller 70 flows into the switch tube Q1 after passing through the third resistor R3, so as to control the conduction and shutdown of the switch tube Q1, thereby allowing the power supply at the input end of the switch tube Q1 to flow to the temperature detector 10 through the output end, or disconnecting the temperature detector 10 from the power supply.

[0050] It is understood that the specific type of the switch Q1 is not limited and can be a MOS transistor, a transistor, or other device with a switching function. For example, in one embodiment, the switch Q1 is a PNP transistor. When the controller 70 outputs a low level to the POWER-IO terminal to the PNP transistor, the PNP transistor conducts, allowing the external power supply VCC to flow to the output terminal of the PNP transistor. When the kettle body 1 is placed on the base 2, the corresponding power supply VCC will flow to the temperature detector 10, energizing the temperature detector 10 to start operation.

[0051] It should be noted that the specific type of the water level excitation signal circuit 60 is not limited to one type, and any type of circuit can be used as long as it can output a signal to excite the water level detector 20 to perform water level detection. Figure 7 The water level excitation signal circuit 60 includes: a third capacitor C3, a first switch circuit 61, a second switch circuit 62, a fourth resistor R7, and a fifth resistor R8. The control ends of the first switch circuit 61 and the second switch circuit 62 are respectively connected to the controller 70. The input end of the first switch circuit 61 is connected to an external DC power supply. The output end of the first switch circuit 61 is connected to one end of the fourth resistor R7. The other end of the fourth resistor R7 is connected to one end of the fifth resistor R8. The other end of the fifth resistor R8 is connected to the input end of the second switch circuit 62. The output end of the second switch circuit 62 is grounded. One end of the third capacitor C3 is connected to one end of the fifth resistor R8 and to the water level detector 20 via a multiplexed signal line. The other end of the third capacitor C3 is connected to the output end of the second switch circuit 62. Through the solution of this embodiment, by controlling the on-off cycle of the first switch circuit 61 and the second switch circuit 62, the charging and discharging of the third capacitor C3 can be controlled. Ultimately, a DC power supply is used to provide a high-frequency AC excitation signal to the water level detector 20.

[0052] Please refer to Figure 6 In one embodiment, the temperature detector 10 is a thermistor R6 and the water level detector 20 is a water level probe T.

[0053] Specifically, one end of the thermistor R6 is connected to the temperature signal excitation circuit 30 via a multiplexing signal line 3, and the other end of the thermistor R6 is connected to the temperature acquisition circuit 40 via a temperature acquisition line 4. A water level probe T is connected to the water level excitation signal circuit 60 via a multiplexing signal line 3, and the water level probe T is connected to the water level acquisition circuit 50 via a water level acquisition line 5. In this embodiment, the kettle body 1 is equivalent to a capacitor CP. When the water level in the kettle changes, the capacitance of the equivalent capacitor CP changes. By using the probe to detect this change, the water level status of the kettle can be ultimately determined.

[0054] In order to facilitate understanding of the various embodiments of the present application, the present application is explained below in conjunction with a specific electric kettle state detection circuit structure. Figure 6 In a more detailed embodiment, the electric kettle status detection circuit includes the features described in the various embodiments described above. The kettle body 1 is placed on the base 2. 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 Q1 is in the on state under the control of the low level. The power supply voltage VCC at the input end of the switch Q1 is applied to the thermistor R6 of the kettle body 1. The thermistor R6 and the first resistor R1 divide the VCC voltage. The controller 70 detects the voltage at R1 through the NTC-AD port and analyzes it to obtain the temperature of the water in the kettle body 1. At the same time, the controller 70 outputs a high level to the WATER-AD port, causing the fourth diode D4 to be reverse-blocked, 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 switch tube Q1 outputs a high level, the switch tube Q1 is cut off, and the water level signal is transmitted to the water level sampling circuit 52 through the water level probe T and the fifth switch tube Q1. The controller 70 detects the voltage value at the second resistor R2 through the WATER-AD port for analysis, and the corresponding water level state quantity can be obtained; at the same time, the controller 70 outputs a high level to the NTC-AD port to make the third diode D3 reversely cut off, thereby preventing the first resistor R1 from affecting the water level detection voltage.

[0055] The above-mentioned electric kettle state detection circuit has multiple state detectors installed on the kettle body, and a controller, multiple excitation signal circuits corresponding to the state detectors, and multiple state acquisition circuits installed on the kettle base. The multiple excitation signal circuits and multiple state acquisition circuits on the base are respectively connected to the controller. When the kettle body and base are coupled, the state detectors and the excitation signal circuits are connected in a one-to-one correspondence by connecting the multiplexed signal lines, and the state acquisition circuits are connected in a one-to-one correspondence by connecting the various acquisition lines. With this solution, the input excitation parts of each state detector use the same multiplexed signal line, reducing the number of connection contacts when coupling the kettle body and base, thereby effectively reducing the size of the kettle's coupling components.

[0056] An electric kettle comprises the above-mentioned electric kettle state detection circuit.

[0057] Specifically, the structure of the electric kettle state detection circuit is as shown in the above-mentioned embodiments and the accompanying drawings. The electric kettle comprises a body 1 and a base 2. The body 1 is primarily used to store water to be heated, while the base 2 is used to connect to a power source and integrate a control circuit and a heating device. The electric kettle state detection circuit includes multiple state detectors 100 disposed on the body 1 of the electric kettle, multiple excitation signal circuits 300 disposed on the base 2 of the electric kettle, multiple state acquisition circuits 200, and a controller 700, as well as a multiplexing signal line 3 and multiple acquisition lines 400 for coupling the body 1 and the base 2. Each excitation signal circuit 300 is connected to the controller 700, and each excitation signal circuit 300 is connected to a corresponding state detector 100 via the same multiplexing signal line 3. Each state detector 100 is connected to a corresponding state acquisition circuit 200 via an acquisition line 400, and each state acquisition circuit 200 is connected to the controller 700.

[0058] The excitation signal circuit 300, state detector 100, and state acquisition circuit 200 correspond one-to-one. Each state detector 100 has a corresponding excitation signal circuit 300 that inputs an excitation signal to control its operation. Simultaneously, each state detector 100 has a corresponding state acquisition circuit 200 that collects the corresponding detection state data. In this embodiment, multiple acquisition circuits 400 are provided, and each state acquisition circuit 200 is connected to the corresponding state detector 100 via an acquisition circuit 400. The input excitation portion of each state detector 100 is input via only one multiplexing signal line 3. This embodiment multiplexes the input lines of multiple state detectors 100, effectively reducing the number of input lines of the state detectors 100, thereby reducing the size of the coupler between the kettle body 1 and base 2.

[0059] It should be noted that the number of state detectors 100, excitation signal circuits 300, state acquisition circuits 200, and acquisition circuits 400 is not unique. Depending on the functions implemented by the electric kettle, the specific number of state detectors 100, excitation signal circuits 300, state acquisition circuits 200, and acquisition circuits 400 may also vary. For example, in one embodiment, when the electric kettle simultaneously has water level detection, water quality detection, and temperature detection functions, the number of state detectors 100, excitation signal circuits 300, state acquisition circuits 200, and acquisition circuits 400 is three. In another embodiment, when the electric kettle simultaneously has two basic functions of water level detection and water temperature detection, the number of state detectors 100, excitation signal circuits 300, state acquisition circuits 200, and acquisition circuits 400 is two.

[0060] In order to facilitate understanding of the various embodiments of this application, the following explanations are given using the water level detection and water temperature detection of the electric kettle as specific embodiments. Figure 2 In this 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.

[0061] To facilitate intelligent control of the electric kettle, the kettle body 1 is equipped with a temperature detector 10 and a water level detector 20, which respectively detect the temperature and water volume of the water inside the kettle body 1. The water level excitation signal circuit 60 outputs the excitation signal required to activate the water level detector 20, while the temperature signal excitation circuit 30 outputs the excitation signal required to activate the temperature detector 10. These circuits primarily provide corresponding operating voltages to the temperature detector 10 and the water level detector 20, respectively. When the temperature of the water heated within the kettle changes, the temperature detector 10's parameters change. The temperature acquisition circuit 40 connected to the temperature detector 10 monitors these parameter changes and transmits them to the controller 70, thereby achieving temperature detection. Similarly, the water level detector 20, in conjunction with the water level acquisition circuit 50, can obtain real-time water level data within the kettle, facilitating intelligent control of the kettle.

[0062] Please refer to Figure 3When a conventional electric kettle has high and low water level probes, the coupler between the kettle body and the base needs to be equipped with 7 sets of contacts to achieve intelligent control of the kettle, respectively connecting the metal kettle body, the two ends of the heating plate, the two ends of the temperature sensor, and the high and low water level probes. This will make the coupler of the electric kettle larger, which will not only increase the cost of the electric kettle, but also make the manufacturing process of the coupler more complicated. Figure 4 As shown, the electric kettle 3 requires four sets of connection contacts to implement temperature and water level acquisition functions. Sensor 1 for acquiring water temperature and detection circuit 1 form one group, sensor 2 for acquiring water level and detection circuit 2 form another group, the circuit for generating excitation signal 1 to control sensor 1's operation and sensor 1 form another group, and finally, the circuit for generating excitation signal 2 to control sensor 2's operation and sensor 2 form another group. Therefore, four corresponding sets of contacts are required on the coupler to achieve these connections.

[0063] In this embodiment, when the kettle body 1 is separated from the base 2, the connections between the temperature detector 10 and the water level detector 20 and the water level excitation signal circuit 60, temperature signal excitation circuit 30, temperature acquisition circuit 40, and water level acquisition circuit 50 on the base 2 are disconnected. Specifically, the multiplexed signal circuit 3, temperature acquisition circuit 4, and water level acquisition circuit 5 are disconnected. However, when the kettle body 1 is placed on the base 2, these circuits reconnect, forming a closed loop, enabling the electric kettle to detect the water temperature and water level in real time.

[0064] It can be understood that in order to facilitate the connection between the components of the kettle body 1 and the components of the base 2, a coupling component is provided on the bottom of the kettle body 1 and the base 2 of the electric kettle. One part of the coupling component is located on the kettle body 1, and the other part is located on the base 2. When in use, it is only necessary to place the kettle body 1 on the base 2 so that the two parts of the coupling component are coupled.

[0065] The above-mentioned electric kettle is equipped with multiple state detectors on the kettle body, and the base of the kettle is equipped with a controller, multiple excitation signal circuits corresponding to the state detectors, and multiple state acquisition circuits. The multiple excitation signal circuits and multiple state acquisition circuits on the base are respectively connected to the controller. When the kettle body and the base are coupled, the state detectors and the excitation signal circuits are connected one-to-one by connecting the multiplexed signal lines, and the state acquisition circuits are connected one-to-one by connecting the various acquisition lines. With this solution, the input excitation parts of each state detector use the same multiplexed signal line, reducing the number of connection contacts when coupling the kettle body and the base, thereby effectively reducing the size of the kettle's coupling components.

[0066] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An electric kettle state detection circuit, characterized in that: include: A plurality of state detectors are arranged on the kettle body of the electric kettle, a plurality of excitation signal circuits, a plurality of state acquisition circuits and a controller are arranged on the base of the electric kettle, and a multiplexed signal circuit and a plurality of acquisition circuits for coupling the kettle body and the base, Each of the excitation signal circuits is connected to the controller respectively, and each of the excitation signal circuits is connected to a corresponding state detector through the same multiplexed signal line. The excitation signal circuit, the state detector and the state acquisition circuit correspond to each other one by one. Each of the state detectors is controlled to start running by inputting an excitation signal through the corresponding excitation signal circuit. Each of the state detectors is connected to the corresponding state acquisition circuit through an acquisition line, and each of the state acquisition circuits is connected to the controller respectively.

2. The electric kettle state detection circuit according to claim 1, characterized in that: 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 includes a water level acquisition circuit and a temperature acquisition circuit, and the acquisition circuit includes 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 to the controller, the water level excitation signal circuit is connected to the water level detector via the multiplexed signal line, the temperature signal excitation circuit is connected to the temperature detector via the multiplexed signal line, the temperature detector is connected to the temperature acquisition circuit via the temperature acquisition line, the water level detector is connected to the water level acquisition circuit via the water level acquisition line, and the temperature acquisition circuit and the water level acquisition circuit are respectively connected to the controller.

3. The electric kettle state detection circuit according to claim 2, characterized in that: The temperature acquisition circuit includes a first isolation circuit and a temperature sampling circuit, and the water level acquisition circuit includes a second isolation circuit and a water level sampling circuit. The first isolation circuit is connected to the temperature detector through the temperature acquisition circuit, the first isolation circuit is connected to the temperature sampling circuit, and the temperature sampling circuit is connected to the controller; The second isolation circuit is connected to the water level detector through the water level acquisition circuit, the second isolation circuit is connected to the water level sampling circuit, and the water level sampling circuit is connected to the controller.

4. The electric kettle state detection circuit according to claim 3, characterized in that: The temperature sampling circuit includes a first diode, a first capacitor and a first resistor, one end of the first resistor is connected to the first isolation circuit and the anode of the first diode, one end of the first capacitor is connected to 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 to the anode of the first diode and the controller, and the cathode of the first diode is used to connect to an external power supply.

5. The electric kettle state detection circuit according to claim 4, characterized in that: 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.

6. The electric kettle state detection circuit according to claim 3, characterized in that: The water level sampling circuit includes a second diode, a second capacitor and a second resistor, one end of the second resistor is connected to the second isolation circuit and the anode of the second diode, one end of the second capacitor is connected to 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 to the anode of the second diode and the controller, and the cathode of the second diode is used to connect to an external power supply.

7. The electric kettle state detection circuit according to claim 6, characterized in that: The water level sampling circuit also 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.

8. The electric kettle state detection circuit according to any one of claims 3 to 7, characterized in that: The first isolation circuit includes a third diode, and the second isolation circuit includes a fourth diode. The cathode of the third diode is connected to the temperature sampling circuit, and the anode of the third diode is connected to the temperature detector through the temperature acquisition circuit. The cathode of the fourth diode is connected to the water level sampling circuit, and the anode of the fourth diode is connected to the water level detector through the water level acquisition circuit.

9. The electric kettle state detection circuit according to claim 2, characterized in that: The temperature signal excitation circuit includes 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. The electric kettle state detection circuit according to claim 2, characterized in that: The temperature detector is a thermistor, and the water level detector is a water level probe.

11. An electric kettle, characterized in that: The electric kettle state detection circuit comprises the electric kettle state detection circuit according to any one of claims 1 to 10.

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