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 detectors and the excitation signal circuits are connected one-to-one by connecting each detection excitation circuit, and the state acquisition circuits and the state detectors are connected one-to-one by connecting the multiplexing signal circuit. Through the above scheme, the outputs of the various state detectors use the same multiplexing signal circuit, 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 used more and more widely 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 achieve these functions, electric kettles must have the ability to detect water temperature and water level signals.

[0003] In conventional water temperature and water level signal detection schemes, the water level and water temperature detectors are connected to the controller for detection through independent signal lines, which requires the coupler between the kettle body and the base to have independent connection contacts and metal rings. The coupler needs to be designed with multiple connection contacts such as the neutral line, the live line, the two end connection lines of the temperature sensing package for detecting water temperature, the water level signal transmission and reception connection lines, etc. If there are high and low water level detections, two water level receiving lines are required. At this time, a total of 7 contacts and 7 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 in size.

[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 detection excitation 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 through a detection excitation circuit, each of the state detectors is respectively connected to a corresponding state acquisition circuit through the same multiplexed signal 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 detection excitation circuit includes a water level excitation circuit and a temperature excitation 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 water level excitation circuit, the temperature signal excitation circuit is connected to the temperature detector through the temperature excitation circuit, the temperature detector is connected to the temperature acquisition circuit through the multiplexed signal circuit, the water level detector is connected to the water level acquisition circuit through the multiplexed signal 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 a multiplexed signal line, 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 a multiplexed signal line, 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 multiplexed signal line, 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 multiplexed signal line.

[0013] In one embodiment, 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 a temperature excitation circuit.

[0014] In one embodiment, the temperature detector includes a thermistor, the water level detector includes a water level probe and a fifth diode, one end of the thermistor is connected to the temperature signal excitation circuit through a temperature excitation circuit, and the other end of the thermistor is connected to the temperature acquisition circuit through the multiplexed signal circuit; the water level probe is connected to the water level excitation signal circuit through the water level excitation circuit, the water level probe is connected to the anode of the fifth diode, and the cathode of the fifth diode is connected to the water level acquisition circuit through the multiplexed signal circuit.

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

[0016] The electric kettle state detection circuit and the electric kettle are provided with a plurality of state detectors on the kettle body, and a controller and a plurality of excitation signal circuits and a plurality of state acquisition circuits corresponding to the state detectors are provided on the base of the electric kettle. The plurality of excitation signal circuits and the plurality of state acquisition circuits on the base 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 one-to-one by connecting each detection excitation circuit, and the state acquisition circuits and the state detectors are connected one-to-one by connecting the multiplexing signal circuit. Through the above scheme, the outputs of the various state detectors use the same multiplexing signal circuit, which reduces the connection contacts when the kettle body and the base are coupled, thereby effectively reducing the size of the coupling device of the electric kettle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. 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 This is a schematic diagram of the structure of an electric kettle state detection circuit in one embodiment;

[0019] Figure 2 It is a schematic diagram of the structure of the electric kettle state detection circuit in another embodiment;

[0020] Figure 3 It 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 a kettle state detection circuit in another embodiment;

[0023] Figure 6 A schematic diagram of the structure of a kettle state detection circuit in yet another embodiment;

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

[0025] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0026] See also Figure 1 , an electric kettle state detection circuit, comprising: a plurality of state detectors 100 arranged on a kettle body 1 of the electric kettle, a plurality of excitation signal circuits 200, a plurality of state acquisition circuits 300 and a controller 70 arranged on a base 2 of the electric kettle, and a multiplexed signal line 4 and a plurality of detection excitation lines 400 for coupling the kettle body 1 and the base 2, each excitation signal circuit 200 is respectively connected to the controller 70, each excitation signal circuit 200 is respectively connected to a corresponding state detector 100 through a detection excitation line 400, each state detector 100 is respectively connected to a corresponding state acquisition circuit 300 through the same multiplexed signal line 4, and each state acquisition circuit 300 is respectively connected to the controller 70.

[0027] Specifically, the excitation signal circuit 200, the state detector 100 and the state acquisition circuit 300 correspond to each other one by one, and each state detector 100 has a corresponding excitation signal circuit 200 inputting an excitation signal to control its start-up operation, and at the same time, each state detector 100 has a corresponding state acquisition circuit 300 to perform corresponding detection state data acquisition. In this embodiment, a plurality of detection excitation lines 400 are set, and each excitation signal circuit 200 is connected to a corresponding state detector 100 through a detection excitation line 400, and the output part of each state detector 100 is output only through a multiplexing signal line 4. In the scheme of this embodiment, the output lines of multiple state detectors 100 are multiplexed, which effectively reduces the number of output lines of the state detector 100, thereby achieving the purpose of reducing the size of the coupler between the kettle body 1 and the base 2 of the electric kettle.

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

[0029] In order to facilitate understanding of the various embodiments of the present 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 detection excitation circuit 400 includes a water level excitation circuit 5 and a temperature excitation circuit 3, 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 water level excitation circuit 5, the temperature signal excitation circuit 30 is connected to the temperature detector 10 through the temperature excitation circuit 3, the temperature detector 10 is connected to the temperature acquisition circuit 40 through the multiplexing signal circuit 4, the water level detector 20 is connected to the water level acquisition circuit 50 through the multiplexing signal circuit 4, 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 includes a kettle body and a base part. The kettle body is mainly used to store water to be heated, and the base is used to connect to a power supply and an integrated control circuit and a heating device. At the same time, in order to facilitate the intelligent control of the electric kettle, the kettle body is also provided with a temperature detector 10 and a water level detector 20 to respectively obtain the temperature and water volume of the water inside the kettle body. The water level excitation signal circuit 60 is a circuit for outputting the excitation signal required for the water level detector 20 to start operation, and the temperature signal excitation circuit 30 is a circuit for outputting the excitation signal required for the temperature detector 10 to start operation, which is mainly manifested in providing corresponding working voltages for the temperature detector 10 and the water level detector 20 respectively. When the temperature of the water heated inside the electric kettle changes, the temperature detector 10 will have certain changes in its own parameters, and the temperature acquisition circuit 40 connected thereto is used to acquire the parameter changes of the temperature detector 10 and send them to the controller 70, thereby achieving the purpose of temperature detection. Similarly, through the water level detector 20 and the water level acquisition circuit 50, real-time water level data inside the electric kettle can be obtained, which is convenient for intelligent control of the electric 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, and 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 of the electric kettle is coupled with the base, the temperature detector 10 is connected to the temperature signal excitation circuit 30 by connecting the temperature excitation circuit 3, the water level detector 20 is connected to the water level excitation signal circuit 60 by connecting the water level excitation circuit 5, the temperature detector 10 is connected to the temperature acquisition circuit 40 by connecting the multiplexing signal line 4, and the water level collector is connected to the water level acquisition circuit 50. When the controller 70 controls the temperature signal excitation circuit 30 to work, the temperature detector 10 starts to run, and the temperature acquisition circuit 40 obtains the signal of the temperature detector 10 through the multiplexed signal line 4 and sends it to the controller 70, so as to realize the water temperature acquisition of the electric kettle. When the controller 70 controls the water level excitation signal circuit 60 to work, the water level detector 20 starts to run, and the water level detection circuit obtains the signal of the water level detector 20 through the multiplexed signal line 4 and sends it to the controller 70, so as to realize the water level acquisition of the electric kettle. Through the above scheme, the outputs of the water level detector 20 and the temperature detector 10 use the same multiplexed signal line 4, which reduces the connection contacts when the kettle body 1 and the base 2 of the electric kettle are coupled, thereby effectively reducing the size of the coupling device of the electric kettle.

[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 realize the intelligent control of the electric kettle, respectively realizing the connection between the metal kettle body, the two ends of the heating plate, the two ends of the temperature sensing package, and the high and low water level probes. At this time, the size of the coupler of the electric kettle will be 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, when the electric kettle realizes the temperature collection and water level collection functions, four groups of connection contacts are required, among which the sensor 1 for collecting water temperature and the detection circuit 1 are one group, the sensor 2 for collecting water level and the detection circuit 2 are one group, the circuit for generating the excitation signal 1 to control the sensor 1 to start running and the sensor 1 are one group, and finally the circuit for generating the excitation signal 2 to control the sensor 2 to start running and the sensor 2 are one group. Therefore, four groups of contacts need to be set on the coupler to realize the connection.

[0033] In the scheme of this embodiment, when the kettle body is separated from the base, the connection between the temperature detector 10 and the water level detector 20 and 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 is disconnected, that is, the connection of the water level excitation circuit 5 is disconnected, the connection of the temperature excitation circuit 3 is disconnected, and the multiplexing signal circuit 4 is disconnected. When the kettle body is placed on the base, these circuits will be reconnected to form a closed loop, realizing the real-time water temperature and water level detection operation of the electric kettle.

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

[0035] For example, see Figure 5In one embodiment, the water level excitation circuit 5 includes a coupling device contact X1-1 disposed on one side of the water level excitation signal circuit 60, and a coupling device contact X2-1 disposed on one side of the water level detector 20; when the kettle body is separated from the base, the connection between X1-1 and X2-1 is disconnected, and when the kettle body is placed on the base, X1-1 and X2-1 are in contact and connected. The temperature excitation circuit 3 includes a coupling device contact X1-2 disposed on one side of the temperature signal excitation circuit 30, and a coupling device contact X2-2 disposed on one side of the temperature detector 10; when the kettle body is separated from the base, the connection between X1-2 and X2-2 is disconnected, and when the kettle body is placed on the base, X1-2 and X2-2 are in contact and connected. At the same time, the multiplexed signal circuit includes a coupling contact X1-3 arranged on the common end side of the temperature acquisition circuit 40 and the water level acquisition circuit 50, and a coupling contact X2-3 arranged on the common end side of the temperature detector 10 and the water level detector 20. When the kettle body is separated from the base, the connection between X1-3 and X2-3 is disconnected. When the kettle body is placed on the base, X1-3 is contacted and connected with X2-3. Through the control of the controller 70, the communication between the temperature acquisition circuit 40 and the temperature detector 10, and the communication between the water level detector 20 and the water level acquisition circuit 50 are respectively realized.

[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 multiplexed signal line 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 multiplexed signal line 4, 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] For further information, please refer to Figure 6In 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, and 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, and the sampled AD signal is sent to the controller 70 for intelligent control of the electric kettle. In this embodiment, the first capacitor C1 and the first resistor R1 are used to 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, which is used to protect the temperature sampling circuit 42. It can be understood that the specific structure of the temperature sampling circuit 42 is not unique, and is not limited to the RC sampling circuit in this embodiment, and other forms of sampling circuits can also be used, as long as the signal related to the water temperature can be collected.

[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, in this embodiment, a first current resistor is further provided between the other end of the first capacitor C1 and the controller 70 to further ensure the working reliability of the circuit. Due to the presence of the first capacitor C1 in the temperature sampling circuit 42, the first current limiting resistor R4 can be provided to prevent the first capacitor C1 from being overcharged by an excessively large impact current, thereby damaging the IO port of the controller 70 connected thereto.

[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, and 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, and the sampled AD signal is sent to the controller 70 for intelligent control of the electric kettle. In this embodiment, the second capacitor C2 and the second resistor R2 are used to 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, which is used to protect the water level sampling circuit 52. It can 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 forms of sampling circuits can also be used as long as they can collect water level related signals.

[0044] For further information, please refer to Figure 6 In 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, in this embodiment, a second current resistor is further provided between the other end of the second capacitor C2 and the controller 70 to further ensure the working reliability of the circuit. Due to the presence of the second capacitor C2 in the water level sampling circuit 52, the second current limiting resistor R5 can be provided to prevent the second capacitor C2 from being overcharged by excessive surge current and damaging the IO port of the controller 70 connected thereto.

[0046] It is understood that there are not only one type of isolation circuit. 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 multiplexing signal line 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 multiplexing signal line 4.

[0047] Specifically, the present 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 will also input a high level through the NTC-AD port of the temperature sampling circuit 42, so that the third diode D3 is reversely cut off, 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 will also input a high level through the WATER-AD port of the water level sampling circuit 52, thereby preventing the fourth diode D4 from being reversely cut off, thereby preventing the second resistor R2 from affecting the voltage during temperature detection.

[0048] See also Figure 6In 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, 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 excitation circuit 3.

[0049] Specifically, this embodiment uses a switching circuit to implement the excitation signal sending operation of the temperature detector 10, and 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, and 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, so that the power supply at the input end of the switch tube Q1 can be output soft flow to the temperature detector 10, or the connection between the temperature detector 10 and the power supply is disconnected.

[0050] It is understood that the specific type of the switch tube Q1 is not unique, and it can be a device with a switch function such as a MOS tube, a transistor, etc. For example, in one embodiment, the switch tube Q1 adopts a PNP transistor. 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. When the kettle body is placed on the base, the corresponding power VCC will flow to the temperature detector 10 to stimulate the temperature detector 10 to start running.

[0051] It should be noted that the specific type of the water level excitation signal circuit 60 is not unique, 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 the water level detector 20. The other end of the third capacitor C3 is connected to the output end of the second switch circuit 62. Through the scheme of this embodiment, the on-off cycle of the first switch circuit 61 and the second switch circuit 62 is controlled, so that the charging and discharging of the third capacitor C3 can be controlled, and finally a DC power supply is used to provide a high-frequency AC excitation signal for the water level detector 20.

[0052] Please refer to Figure 6 In one embodiment, the temperature detector 10 includes a thermistor R6, the water level detector 20 includes a water level probe T and a fifth diode D5, one end of the thermistor R6 is connected to the temperature signal excitation circuit 30 through a temperature excitation circuit 3, and the other end of the thermistor R6 is connected to the temperature acquisition circuit 40 through a multiplexing signal line 4; the water level probe T is connected to the water level excitation signal circuit 60 through the water level excitation line 5, the water level probe T is connected to the anode of the fifth diode D5, and the cathode of the fifth diode D5 is connected to the water level acquisition circuit 50 through the multiplexing signal line 4.

[0053] Specifically, in this embodiment, the kettle body of the electric kettle is equivalent to a capacitor CP. When the water level of the electric kettle changes, the capacitance value of the equivalent capacitor CP changes. By using the probe to collect this change, the water level state of the electric kettle can be finally obtained. At the same time, since the temperature detector 10 and the water level detector 20 have only one signal line for connecting with the base, that is, the multiplexed signal line 4, in order to prevent the kettle body (or the equivalent capacitor CP) of the electric kettle from affecting the temperature acquisition circuit 40 (specifically the voltage value at the first resistor R1 of the temperature sampling circuit 42) when the electric kettle state detection circuit detects the water temperature, a fifth diode D5 is also provided between the water level probe T and the thermistor R6. At this time, when the thermistor R6 receives the excitation signal and starts to detect the temperature, the fifth diode D5 will be reversely cut off accordingly.

[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 6In a more detailed embodiment, the electric kettle state detection circuit includes the features shown in the above-mentioned embodiments. The kettle body of the electric kettle is placed on the base. 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. The thermistor R6 and the first resistor R1 analyze VCC. The controller 70 detects the voltage value at R1 through the NTC-AD port for analysis, and the temperature value of the water in the kettle body can be obtained. When performing water temperature detection, the fifth diode D5 is reversely cut off to prevent the equivalent capacitor CP from affecting the voltage at the first resistor R1. 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 is provided with a plurality of state detectors on the kettle body, and a controller and a plurality of excitation signal circuits and a plurality of state acquisition circuits corresponding to the state detectors are provided on the base of the electric kettle. The plurality of excitation signal circuits and the plurality of state acquisition circuits on the base 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 one-to-one by connecting each detection excitation circuit, and the state acquisition circuits and the state detectors are connected one-to-one by connecting the multiplexing signal circuit. Through the above scheme, the outputs of the various state detectors use the same multiplexing signal circuit, 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.

[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 embodiments. The electric kettle includes a kettle body and a base part. The kettle body is mainly used to store water to be heated, and the base is used to connect to a power supply and an integrated control circuit and a heating device. The electric kettle state detection circuit includes a plurality of state detectors 100 arranged on the kettle body 1 of the electric kettle, a plurality of excitation signal circuits 200 arranged on the base 2 of the electric kettle, a plurality of state acquisition circuits 300 and a controller 70, and a multiplexed signal line 4 and a plurality of detection excitation lines 400 for coupling the kettle body 1 and the base 2. Each excitation signal circuit 200 is connected to the controller 70 respectively, each excitation signal circuit 200 is connected to a corresponding state detector 100 through a detection excitation line 400 respectively, each state detector 100 is connected to a corresponding state acquisition circuit 300 through the same multiplexed signal line 4, and each state acquisition circuit 300 is connected to the controller 70 respectively.

[0058] The excitation signal circuit 200, the state detector 100 and the state acquisition circuit 300 correspond to each other one by one. Each state detector 100 has a corresponding excitation signal circuit 200 to input an excitation signal to control its start-up operation. At the same time, each state detector 100 has a corresponding state acquisition circuit 300 to perform corresponding detection state data acquisition. In this embodiment, a plurality of detection excitation lines 400 are set, and each excitation signal circuit 200 is connected to a corresponding state detector 100 through a detection excitation line 400, and the output part of each state detector 100 is output only through a multiplexing signal line 4. In the scheme of this embodiment, the output lines of multiple state detectors 100 are multiplexed, which effectively reduces the number of output lines of the state detector 100, thereby achieving the purpose of reducing the size of the coupler between the kettle body 1 and the base 2 of the electric kettle.

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

[0060] In order to facilitate understanding of the various embodiments of the present 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 detection excitation circuit 400 includes a water level excitation circuit 5 and a temperature excitation circuit 3. In order to facilitate the intelligent control of the electric kettle, the kettle body is also provided with a temperature detector 10 and a water level detector 20 to respectively obtain the temperature and water volume of the water inside the kettle body. The water level excitation signal circuit 60 is a circuit for outputting the excitation signal required for the water level detector 20 to start operation, and the temperature signal excitation circuit 30 is a circuit for outputting the excitation signal required for the temperature detector 10 to start operation, which is mainly manifested in providing corresponding working voltages for the temperature detector 10 and the water level detector 20 respectively. When the temperature of the water heated inside the electric kettle changes, the temperature detector 10 will have certain changes in its own parameters, and the temperature acquisition circuit 40 connected thereto is used to collect the parameter changes of the temperature detector 10 and send them to the controller 70, thereby achieving the purpose of temperature detection. Similarly, by using the water level detector 20 in conjunction with the water level acquisition circuit 50, real-time water level data inside the electric kettle can be obtained, facilitating intelligent control of the electric kettle.

[0061] Please refer to Figure 3 When a conventional electric kettle has a high and low water level probe T, the coupler between the kettle body and the base needs to be equipped with 7 sets of contacts to realize the intelligent control of the electric kettle, respectively realizing the connection between the metal kettle body, the two ends of the heating plate, the two ends of the temperature sensing package, and the high and low water level probes T. At this time, the size of the coupler of the electric kettle will be 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, when the electric kettle realizes the temperature collection and water level collection functions, four groups of connection contacts are required, among which the sensor 1 for collecting water temperature and the detection circuit 1 are one group, the sensor 2 for collecting water level and the detection circuit 2 are one group, the circuit for generating the excitation signal 1 to control the sensor 1 to start running and the sensor 1 are one group, and finally the circuit for generating the excitation signal 2 to control the sensor 2 to start running and the sensor 2 are one group. Therefore, four groups of contacts need to be set on the coupler to realize the connection.

[0062] In the scheme of this embodiment, when the kettle body is separated from the base, the connection between the temperature detector 10 and the water level detector 20 and 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 is disconnected, that is, the connection of the water level excitation circuit 5 is disconnected, the connection of the temperature excitation circuit 3 is disconnected, and the multiplexing signal circuit 4 is disconnected. When the kettle body is placed on the base, these circuits will be reconnected to form a closed loop, realizing the real-time water temperature and water level detection operation of the electric kettle.

[0063] It can be understood that in order to facilitate the connection between the components of the kettle body and the components of the base, coupling components are arranged on the bottom of the kettle body and the base of the electric kettle. One part of the coupling component is located on the kettle body, and the other part is located on the base. When in use, you only need to place the kettle body on the base so that the two parts of the coupling component are coupled.

[0064] The electric kettle is provided with a plurality of state detectors on the kettle body, and a controller and a plurality of excitation signal circuits and a plurality of state acquisition circuits corresponding to the state detectors are provided on the base of the electric kettle. The plurality of excitation signal circuits and the plurality of state acquisition circuits on the base 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 one-to-one by connecting each detection excitation circuit, and the state acquisition circuits and the state detectors are connected one-to-one by connecting the multiplexing signal circuit. Through the above scheme, the outputs of the various state detectors use the same multiplexing signal circuit, 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.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0066] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached 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 detection excitation circuits are used to couple the kettle body and the base, Each of the excitation signal circuits is connected to the controller respectively, each of the excitation signal circuits is connected to a corresponding state detector through a detection excitation circuit respectively, each of the state detectors is connected to a corresponding state acquisition circuit through the same multiplexed signal circuit respectively, and each of the state acquisition circuits is connected to the controller respectively; 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 detection excitation circuit includes a water level excitation circuit and a temperature excitation 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 water level excitation circuit, and the temperature signal excitation circuit is connected to the temperature detector through the temperature excitation circuit; 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 a multiplexed signal line, 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 a multiplexed signal line, the second isolation circuit is connected to the water level sampling circuit, and the water level sampling circuit is connected to the controller.

2. The electric kettle state detection circuit according to claim 1, 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.

3. The electric kettle state detection circuit according to claim 2, 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.

4. The electric kettle state detection circuit according to claim 1, 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.

5. The electric kettle state detection circuit according to claim 4, 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.

6. The electric kettle state detection circuit according to any one of claims 1 to 5, 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 multiplexed signal line. 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 multiplexed signal line.

7. The electric kettle state detection circuit according to claim 1, 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 a temperature excitation circuit.

8. The electric kettle state detection circuit according to claim 1, characterized in that: The temperature detector includes a thermistor, the water level detector includes a water level probe and a fifth diode, One end of the thermistor is connected to the temperature signal excitation circuit through a temperature excitation circuit, and the other end of the thermistor is connected to the temperature acquisition circuit through the multiplexed signal circuit; the water level probe is connected to the water level excitation signal circuit through a water level excitation circuit, the water level probe is connected to the anode of the fifth diode, and the cathode of the fifth diode is connected to the water level acquisition circuit through the multiplexed signal circuit.

9. 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 8.

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