Load detection device and household appliance

Abstract

Embodiments of the present application provide a load detection device and a household appliance. The load detection device comprises a first power port, a first interface and a second interface; a resistance unit comprises a first resistance and a plurality of second resistances, the first resistance and the plurality of second resistances are connected in series between the first interface and the second interface, each second resistance comprises a connection end close to the first resistance, and the connection end of each second resistance and the first interface are used to connect two ends of a load; a plurality of control circuits, each control circuit is connected to two ends of a second resistance to disconnect or connect the two ends of the second resistance; a chip is connected to each control circuit and the first resistance, and the chip is configured to control different numbers of second resistances in the plurality of second resistances to be short-circuited through the plurality of control circuits, and read a measured voltage at two ends of the first resistance when the different numbers of second resistances are short-circuited. Embodiments of the present application detect the working states of a plurality of loads, and reduce power consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a load detection device and a household appliance. BACKGROUND

[0002] The household appliance detection circuit is used for converting power to convert the mains into the DC weak current required by the controller, but in the conversion process, the detection circuit needs to determine the current voltage state and the working state of the load. However, the existing detection circuit is relatively complex, needs more components, and produces more energy loss. SUMMARY

[0003] The embodiments of the present application provide a load detection device and a household appliance, which can solve the problem of the complex existing detection circuit.

[0004] The embodiments of the present application provide a load detection device, which comprises:

[0005] A first power port comprises a first interface and a second interface;

[0006] A resistance unit comprises a first resistance and a plurality of second resistances, the first resistance and the plurality of second resistances are connected in series and connected between the first interface and the second interface, each second resistance comprises a connection end close to the first resistance, and the connection end of each second resistance and the first interface are used for connecting two ends of a load;

[0007] A plurality of control circuits, each control circuit is connected to two ends of a second resistance, so that the two ends of the second resistance are disconnected or connected;

[0008] A chip is connected to each control circuit and the first resistance, and the chip is configured to control different numbers of second resistances in the plurality of second resistances to be short-circuited through the plurality of control circuits, and read the measured voltage at the two ends of the first resistance when the different numbers of second resistances are short-circuited.

[0009] Optionally, the control circuit comprises a first control circuit and a second control circuit, the plurality of second resistances comprises a first sub-resistance and a second sub-resistance, two ends of the first sub-resistance are connected to the first control circuit, two ends of the second sub-resistance are connected to the second control circuit, the connection end of the first sub-resistance is used for connecting a first load, and the connection end of the second sub-resistance is used for connecting a second load.

[0010] Optionally, the first resistance comprises a third sub-resistance and a fourth sub-resistance, the input voltage input by the first interface of the first power supply is Vin, the resistance value of the first sub-resistance is R1, the resistance value of the second sub-resistance is R2, the resistance value of the third sub-resistance is R3, and the resistance value of the fourth sub-resistance is R4.

[0011] When neither of the first sub-resistance and the second sub-resistance is short-circuited, a first voltage value V1 across the fourth sub-resistance is Vin*R4 / (R1+R2+R3+R4);

[0012] When the first sub-resistance is short-circuited and the second sub-resistance is not short-circuited, a second voltage value V2 across the fourth sub-resistance is Vin*R4 / (R2+R3+R4);

[0013] When both of the first sub-resistance and the second sub-resistance are short-circuited, a third voltage value V3 across the fourth sub-resistance is Vin*R4 / (R3+R4).

[0014] Optionally, the measurement voltage and the input voltage have the same frequency, and a peak value of the measurement voltage and a peak value of the input voltage occur at the same time.

[0015] Optionally, the detection device further comprises a slide unit, the slide unit comprising a first diode, a fifth resistance and an electrolytic capacitor, an anode of the first diode being connected with a first end of the fourth sub-resistance, a cathode of the first diode being connected with a first end of the fifth resistance, a second end of the fifth resistance and a positive electrode of the electrolytic capacitor being connected, the positive electrode of the electrolytic capacitor being connected with the chip, and a negative electrode of the electrolytic capacitor being connected with a second end of the fourth sub-resistance.

[0016] The first diode outputs a first voltage after half-wave rectification of a voltage across the fourth sub-resistance, and the electrolytic capacitor is configured to obtain the voltage after amplitude modulation of the first voltage.

[0017] Optionally, the slide unit further comprises a second power supply port, a second diode, a third diode, a first capacitor and a sixth resistance, a cathode of the second diode being connected with a first interface of the second power supply, the cathode of the second diode being connected with an anode of the third diode, a cathode of the third diode being connected with the second power supply port, a first end of the sixth resistance being connected with a cathode of the first diode, a second end of the sixth resistance being connected with a second interface of the first power supply, a first end of the first capacitor being connected with the cathode of the first diode, and a second end of the first capacitor being connected with the second interface of the first power supply.

[0018] Optionally, the first control circuit comprises a relay, the relay comprising two connection contacts, and the chip controls the two connection contacts to be turned on or turned off, so as to turn on or turn off the first load.

[0019] Optionally, the first control circuit further comprises a third power port, a fourth diode and a triode, the relay comprises a coil, a first end of the coil is connected with the third power port, a second end of the coil is grounded, a cathode of the fourth diode is connected with a collector of the triode, an anode of the fourth diode is connected with the collector of the triode, an emitter of the triode is grounded, and a base of the triode is connected with the chip.

[0020] Optionally, the first control circuit comprises a seventh resistor and an eighth resistor, one end of the seventh resistor is connected with the chip, the other end of the seventh resistor is connected with the base of the triode, one end of the eighth resistor is connected with the base of the triode, and the other end of the eighth resistor is grounded.

[0021] The embodiment of the present application further provides a household appliance comprising

[0022] a plurality of loads;

[0023] The detection device of any one of the above, the connecting end of each second resistor in the detection device and the first interface are used for connecting two ends of one load.

[0024] The present application has the beneficial effects that: the detection device of the load provided by the embodiment of the present application comprises a first power port, a resistor unit, a plurality of control circuits and a chip, wherein the resistor unit comprises a first resistor and a plurality of second resistors, the first resistor and the plurality of second resistors are connected in series between the first interface and the second interface, each second resistor comprises a connecting end close to the connecting end of the first resistor, the connecting end of each second resistor and the first interface are used for connecting two ends of one load, and each control circuit is connected with two ends of one second resistor respectively, so that the two ends of the second resistor are disconnected or connected. The present application has the conception that the resistance corresponding to the control circuit is short-circuited when the control circuit is turned on, so that the voltage at the two ends of the voltage dividing resistor is different when different control circuits are turned on, and then the chip can judge the zero-crossing detection and the high-voltage and low-voltage detection of the load through the voltage at the two ends of the voltage dividing resistor, and can judge the state of the first load working alone and the state when the first load and the second load work simultaneously according to the voltage at the two ends of the voltage dividing resistor. By building one detection device, the working states of a plurality of loads can be detected at the same time, the chip port is effectively utilized, the components are simplified, and the cost and power consumption of the household controller are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description only constitute some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0026] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings. In the following description, the same reference numbers represent the same parts.

[0027] Figure 1 The first circuit diagram of the load detection device provided by the embodiments of the present application.

[0028] Figure 2 The second circuit diagram of the load detection device provided by the embodiments of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] The existing detection device will introduce multiple components when detecting zero-crossing and multiple load high-low voltage detection at the same time, and the circuit is relatively complex, resulting in large energy loss.

[0032] Therefore, in order to solve the above problems, the application provides a load detection device and a household appliance. The application will be further described below in combination with the drawings and embodiments.

[0033] Please refer to Figure 1 , Figure 1 The first circuit diagram of the load detection device provided by the embodiment of the application. The embodiment of the application provides a load detection device 100, which comprises a first power port 10, a resistance unit 20, a plurality of control circuits 50 and a chip 40. The first power port 10 comprises a first interface 110 and a second interface 120; the resistance unit 20 comprises a first resistance 210 and a plurality of second resistances 220, the first resistance 210 and the plurality of second resistances 220 are connected in series between the first interface 110 and the second interface 120, each second resistance 220 comprises a connection end close to the first resistance 210, and the connection end of each second resistance 220 and the first interface 110 are used to connect two ends of a load. Each control circuit 50 is connected to two ends of a second resistance 220 respectively, so as to disconnect or connect the two ends of the second resistance 220; the chip 40 is connected to each control circuit 50 and the first resistance 210, and the chip 40 is configured to control different numbers of second resistances 220 in the plurality of second resistances 220 to be short-circuited through the plurality of control circuits 50, and read the voltage at the two ends of the first resistance 210 when the different numbers of second resistances 220 are short-circuited. The embodiment of the application turns on a control circuit 50, so that the resistance connected to the control circuit 50 is short-circuited, and turns on different control circuits 50 to make different voltage dividing resistances conduct, so that the chip 40 can perform zero-crossing detection and high / low voltage detection of the load by measuring different voltages at the two ends of the voltage dividing resistances. The embodiment of the application can detect the working states of multiple loads at the same time by building a detection device 100, effectively utilizes the ports of the chip 40 and simplifies the components, and reduces the cost and power consumption of the household controller.

[0034] For example, please refer to Figure 2 , Figure 2A second circuit diagram of a load detection device is provided in the embodiments of the present application. The control circuit 50 comprises a first control circuit 510 and a second control circuit 520, the load comprises a first load 410 connected with the first control circuit 510 and a second load 420 connected with the second control circuit 520, the plurality of second resistors 220 comprises a first sub-resistor R1 and a second sub-resistor R2, two ends of the first sub-resistor R1 are connected with the first control circuit 510, two ends of the second sub-resistor R2 are connected with the second control circuit 520, a first end of the first sub-resistor R1 away from the connection end is used to connect the first interface 110 of the power supply, the connection end of the first sub-resistor R1 is used to connect the first load 410, a first end of the second sub-resistor R2 away from the connection end is used to connect the connection end of the first sub-resistor R1, and the connection end of the second sub-resistor R2 is used to connect the second load 420. The first resistor 210 comprises a third sub-resistor R3 and a fourth sub-resistor R4, a first end of the third sub-resistor R3 is connected with the connection end of the second sub-resistor R2, a second end of the third sub-resistor R3 is connected with a first end of the fourth sub-resistor R4, and a second end of the fourth sub-resistor R4 is connected with the second interface 120 of the power supply interface. The input voltage input by the first interface 110 of the first power supply is Vin, the resistance value of the first sub-resistor R1 is R1, the resistance value of the second sub-resistor R2 is R2, the resistance value of the third sub-resistor R3 is R3, and the resistance value of the fourth sub-resistor R4 is R4.

[0035] When the first control circuit 510 and the second control circuit 520 do not turn on the first load 410 and the second load 420, the two ends of the first sub-resistor R1 and the second sub-resistor R2 are not disconnected, that is, the first sub-resistor R1 and the second sub-resistor R2 are both turned on, the input voltage is divided by the first sub-resistor R1, the second sub-resistor R2, the third sub-resistor R3 and the fourth sub-resistor R4, so that the first voltage value V1 across the fourth sub-resistor R4 is Vin*R4 / (R1+R2+R3+R4). When the first load 410 works and the second load 420 does not work, the first sub-resistor R1 is short-circuited by the first control circuit 510, the second sub-resistor R2 is turned on, the input voltage is divided by the second sub-resistor R2, the third sub-resistor R3 and the fourth sub-resistor R4, so that the second voltage value V2 across the fourth sub-resistor R4 is Vin*R4 / (R2+R3+R4). When the first load 410 and the second load 420 both work, the first sub-resistor R1 is short-circuited by the first control circuit 510, the second sub-resistor R2 is short-circuited by the second control circuit 520, the input voltage is divided by the third sub-resistor R3 and the fourth sub-resistor R4, so that the third voltage value V3 across the fourth sub-resistor R4 is Vin*R4 / (R3+R4).

[0036] By measuring the voltage across the fourth sub-resistor R4, the zero-crossing state of the mains can be measured, and the operating voltage when the first load 410 works alone can also be measured, and then whether there is a situation of excessively high voltage or excessively low voltage during the working of the first load 410 can be judged according to the operating voltage. The operating voltage when the first load 410 and the second load 420 work simultaneously can also be measured, and then whether there is a situation of excessively high voltage or excessively low voltage when the first load 410 and the second load 420 work can be judged according to the operating voltage. Further, whether the first load 410 is in a working state and whether the second load 420 is in a working state can also be known according to the voltage across the fourth sub-resistor R4.

[0037] It should be noted that the plurality of second resistors 220 are not limited to the first sub-resistor R1 and the second sub-resistor R2 described above, and the plurality of second resistors 220 can also include other resistors, that is, the detection circuit can also control a plurality of loads, and is not limited to only two loads, and only needs to connect the corresponding load, resistor and control circuit 50 according to the connection relationship of the first sub-resistor R1, the first load 410 and the first control circuit 510.

[0038] It should be noted that the second load 420 needs to be started in the state that the first load 410 works, that is, only when the first load 410 is in a safe state, the second load 420 can be started. The first load 410 can be a load with a protection function. For example, when the household appliance is a washing machine, the first load 410 can be a door lock, and the second load 420 is a bucket, and only when the door lock is opened to a physically closed state, the bucket can be started to work. For another example, when the household appliance is a heater, the first load 410 can be a door lock, and the second load 420 is an electric heating wire, and the electric heating wire can only heat when the door lock works normally without leakage. By starting the second load 420 in the safe state of the first load 410, the safety of the household appliance is improved, and the safety of the user is improved.

[0039] It can be understood that the voltage measured across the fourth sub-resistor R4 is a transient value, which changes with the voltage output by the first power port 10, that is, the voltage measured across the fourth sub-resistor R4 has the same frequency as the voltage input by the first power port 10, and the peak value of the measured voltage and the peak value of the input voltage appear at the same time.

[0040] The resistance unit 20 further comprises a second capacitor C2, one end of the second capacitor C2 is connected to the third sub-resistor, and the other end of the second capacitor C2 is connected to the second interface 120.

[0041] The detection device 100 further comprises a sliding wave unit 30, which comprises a first diode D1, a fifth resistor R6 and an electrolytic capacitor C1. The anode of the first diode D1 is connected with the first end of the fourth sub resistor R4, the cathode of the first diode D1 is connected with the first end of the fifth resistor R6, the second end of the fifth resistor R6 and the positive electrode of the electrolytic capacitor C1 are connected, the positive electrode of the electrolytic capacitor C1 is connected with the third port, and the negative electrode of the electrolytic capacitor C1 is connected with the second end of the fourth sub resistor R4.

[0042] The first diode D1 rectifies the voltage across the fourth sub resistor R4 to output a first voltage, and the electrolytic capacitor C1 is used to amplitude modulate the first voltage to obtain a voltage.

[0043] The sliding wave unit 30 further comprises a second diode D2, a third diode D3, a first capacitor C2 and a sixth resistor R7. The cathode of the second diode D2 is connected with the first interface 110 of the second power supply, the cathode of the second diode D2 is connected with the anode of the third diode D3, the cathode of the third diode D3 is connected with the second interface 120 of the first power supply, the first end of the sixth resistor R7 is connected with the cathode of the first diode D1, the second end of the sixth resistor R7 is connected with the second interface 120 of the first power supply, the first end of the first capacitor C2 is connected with the cathode of the first diode D1, and the second end of the first capacitor C2 is connected with the second interface 120 of the first power supply.

[0044] According to the embodiment of the present application, the voltage across the fourth sub resistor R4 is processed by the sliding wave, so that the frequency and amplitude of the voltage can be reduced, so that the port of the chip 40 can recognize the voltage. The frequency of the voltage across the fourth sub resistor R4 is the same as the frequency of the voltage detected by the chip 40, and the peak value of the voltage across the fourth sub resistor R4 and the peak value of the voltage detected by the chip 40 appear at the same time.

[0045] That is, when the first load 410 and the second load 420 are not working, and the first power port 10 outputs a voltage, the voltage is divided by the first sub resistor R1, the second sub resistor R2, the third sub resistor R3 and the fourth sub resistor R4, and then the voltage across the fourth sub resistor R4 is rectified by the first diode D1 to obtain a first voltage. The first voltage is changed into a first voltage signal VDC1 with a fixed amplitude and a consistent period after passing through the fifth resistor R6 and the electrolytic capacitor C1. The first voltage signal VDC1 is detected by the chip 40 through the ADC detection port of the chip 40, and the chip 40 reads the value of the first voltage signal VDC1 in a certain time, so as to perform zero-crossing detection.

[0046] When the first load 410 is working and the second load 420 is not working, the voltage output by the first power port 10 is divided by the second sub-resistor R2, the third sub-resistor R3 and the fourth sub-resistor R4, and then the voltage across the fourth sub-resistor R4 is rectified by the first diode D1 to obtain a second voltage. The second voltage is converted into a second voltage signal VDC2 with a fixed amplitude by the fifth resistor R6 and the electrolytic capacitor C1. The second voltage signal VDC2 is detected by the chip 40 through the ADC detection port of the chip 40. The chip 40 reads the value of the second voltage signal VDC2 in a certain period of time, and reads the effective value, the maximum value and the minimum value of the second voltage signal VDC2 in the period. The maximum value and the minimum value are compared with the threshold value to determine whether the voltage of the first load 410 is too high or too low in the period. If the voltage is too high or too low, a warning message will be sent to remind the user.

[0047] When the first load 410 and the second load 420 are both working, the voltage output by the first power port 10 is divided by the third sub-resistor R3 and the fourth sub-resistor R4, and then the voltage across the fourth sub-resistor R4 is rectified by the first diode D1 to obtain a third voltage. The third voltage is converted into a third voltage signal VDC3 with a fixed amplitude by the fifth resistor R6 and the electrolytic capacitor C1. The third voltage signal VDC3 is detected by the chip 40 through the ADC detection port of the chip 40. The chip 40 reads the value of the third voltage signal VDC3 in a certain period of time, and reads the effective value, the maximum value and the minimum value of the third voltage signal VDC3 in the period. The maximum value and the minimum value are compared with the threshold value to determine whether the voltage of the first load 410 and the second load 420 is too high or too low in the period. If the voltage is too high or too low, a warning message will be sent to remind the user.

[0048] It should be noted that the amplitudes of the first voltage signal VDC1, the second voltage signal VDC2 and the third voltage signal VDC3 are not the same, and the amplitudes of the first voltage signal VDC1, the second voltage signal VDC2 and the third voltage signal VDC3 need to be gradiently distinguished according to the parameter settings among the first sub-resistor R1, the second sub-resistor R2, the third sub-resistor R3 and the fourth sub-resistor R4. For example, 270V is set as a high voltage detection point, and 187V is set as a low voltage protection point. When the first load 410 is normally working, the corresponding 220V voltage waveform is set to 0.5V-1.2V. When the voltage rises to 270V, the corresponding waveform peak voltage is 1.45V. When the voltage decreases to 187V, the corresponding voltage is 0.345V, that is, the voltage waveform of the first load 410 from the highest voltage to the lowest voltage is set to 0.345V-1.45V. When the second load 420 is normally working, the corresponding 220V voltage waveform is 1.7V-2.7V. At this time, even if the voltage fluctuates in the working state of the first load 410, the voltage is 1.5V at 187V, and the voltage is 2.95V at 270V. That is, the voltage waveform of the first load 410 from the highest voltage to the lowest voltage is set to 1.5V-2.95V. Therefore, the two conditions do not cross the voltage, and the misjudgment can be avoided to accurately distinguish whether the first load 410 is working or the second load 420 is working.

[0049] The first control circuit 510 includes a first relay 511, and the first relay 511 includes a first coil and a first contact switch. The first contact switch includes two connection contacts. The chip 40 controls the two connection contacts to be conductive or non-conductive, so that the first load 410 is turned on or turned off. The first connection contact of the first contact switch is connected with the first interface 110 of the first power port 10, and the second connection contact of the first contact switch is connected with the connection end of the first sub-resistor R1. When the chip 40 sends a signal to make the first coil conductive to attract the first contact switch, the first load 410 works, and the first resistor 210 is short-circuited.

[0050] The first control circuit 510 further includes a third power port 512, a fourth diode D4 and a first triode Q1. The first end of the first coil is connected with the third power port 512, and the second end of the first coil is grounded. The cathode of the fourth diode D4 is connected with the collector of the first triode Q1, the anode of the fourth diode D4 is connected with the collector of the first triode Q1, the emitter of the first triode Q1 is grounded, and the base of the first triode Q1 is connected with the chip 40.

[0051] The first control circuit 510 comprises a seventh resistor R8 and an eighth resistor R9, one end of the seventh resistor R8 is connected to the chip 40, the other end of the seventh resistor R8 is connected to the base of the first triode Q1, one end of the eighth resistor R9 is connected to the base of the first triode Q1, and the other end of the eighth resistor R9 is grounded. The first triode Q1 can be turned on or turned off by voltage division of the seventh resistor R8 and the eighth resistor R9.

[0052] The second load 420 comprises a second control circuit 520, the second control circuit 520 comprises a second relay 521, the second relay 521 comprises a second coil and a second contact switch, the second contact switch comprises two connection contacts, the chip 40 controls the two connection contacts to be turned on or turned off, so that the second load 420 is turned on or turned off, the first connection contact of the second contact switch is connected to the first interface 110 of the first power port 10, and the second connection contact of the second contact switch is connected to the connection end of the second sub-resistor R2; when the second contact switch is attracted after the second coil is turned on by the chip 40 sending a signal, the second load 420 works, and the first resistor 210 and the second resistor 220 are short-circuited.

[0053] The second control circuit 520 further comprises a fifth diode D5 and a second triode Q2, the first end of the second coil is connected to the third power port 512, the second end of the second coil is grounded, the cathode of the fifth diode D5 is connected to the collector of the second triode Q2, the anode of the fifth diode D5 is connected to the collector of the second triode Q2, the emitter of the second triode Q2 is grounded, and the base of the second triode Q2 is connected to the chip 40.

[0054] The first control circuit 510 comprises a ninth resistor R10 and a tenth resistor R11, one end of the ninth resistor R10 is connected to the chip 40, the other end of the ninth resistor R10 is connected to the base of the second triode Q2, one end of the tenth resistor R11 is connected to the base of the second triode Q2, and the other end of the eighth resistor R9 is grounded. The second triode Q2 can be turned on or turned off by voltage division of the ninth resistor R10 and the tenth resistor R11.

[0055] The application further provides a household appliance, which comprises a plurality of loads and the load detection device 100 described in any one of the preceding embodiments, and specific details can be found in the foregoing description and will not be repeated here.

[0056] The load detection device 100 and the household appliance provided by the embodiments of the application are described in detail above. The principles and implementation manners of the application are described by applying specific examples in this paper, and the above description of the embodiments is only used to help understand the application. Meanwhile, according to the idea of the application, the specific implementation manners and application ranges can be changed by those skilled in the art, and on the basis of the above, the content of the specification should not be understood as a limitation of the application.

Claims

1. A load detection device, characterized by, The detection device comprises: a first power port comprising a first interface and a second interface; a resistance unit comprising a first resistance and a plurality of second resistances, the first resistance and the plurality of second resistances being connected in series between the first interface and the second interface, each of the second resistances comprising a connection end close to the first resistance, and the connection end of each of the second resistances and the first interface being used for connecting two ends of a load; a plurality of control circuits, each of the control circuits being connected to two ends of a second resistance to disconnect or connect the two ends of the second resistance; a chip connected to each of the control circuits and the first resistance, the chip being configured to control different numbers of the second resistances in the plurality of second resistances to be short-circuited by the plurality of control circuits, and read a measured voltage at two ends of the first resistance when the different numbers of the second resistances are short-circuited. The control circuit comprises a first control circuit and a second control circuit, the plurality of second resistances comprises a first sub-resistance and a second sub-resistance, two ends of the first sub-resistance are connected to the first control circuit, two ends of the second sub-resistance are connected to the second control circuit, a connection end of the first sub-resistance is used for connecting a first load, and a connection end of the second sub-resistance is used for connecting a second load. The first resistance comprises a third sub-resistance and a fourth sub-resistance, an input voltage input by the first interface of the first power supply is Vin, a resistance value of the first sub-resistance is R1, a resistance value of the second sub-resistance is R2, a resistance value of the third sub-resistance is R3, and a resistance value of the fourth sub-resistance is R4. When neither of the first sub-resistance and the second sub-resistance is short-circuited, a first voltage value V1 at two ends of the fourth sub-resistance is Vin*R4 / (R1+R2+R3+R4). When the first sub-resistance is short-circuited and the second sub-resistance is not short-circuited, a second voltage value V2 at two ends of the fourth sub-resistance is Vin*R4 / (R2+R3+R4). When the first sub-resistance and the second sub-resistance are both short-circuited, a third voltage value V3 at two ends of the fourth sub-resistance is Vin*R4 / (R3+R4).

2. The detection device of claim 1, wherein, The measured voltage and the input voltage have the same frequency, and a peak value of the measured voltage and a peak value of the input voltage occur at the same time.

3. The detection device of claim 1, wherein, The detection device further comprises a sliding unit, the sliding unit comprising a first diode, a fifth resistance, and an electrolytic capacitor, an anode of the first diode being connected to a first end of the fourth sub-resistance, a cathode of the first diode being connected to a first end of the fifth resistance, a second end of the fifth resistance and a positive electrode of the electrolytic capacitor being connected, the positive electrode of the electrolytic capacitor being connected to the chip, and a negative electrode of the electrolytic capacitor being connected to a second end of the fourth sub-resistance. The first diode outputs a first voltage after half-wave rectification of a voltage at two ends of the fourth sub-resistance, and the electrolytic capacitor is used for amplitude modulation of the first voltage to obtain the voltage.

4. The detection device of claim 3, wherein, The slide unit further comprises a second power port, a second diode, a third diode, a first capacitor and a sixth resistor, the cathode of the second diode is connected with the second power port, the anode of the second diode is connected with the cathode of the third diode, the anode of the third diode is connected with the second interface of the first power, the first end of the sixth resistor is connected with the cathode of the first diode, the second end of the sixth resistor is connected with the second interface of the first power, the first end of the first capacitor is connected with the cathode of the first diode, and the second end of the first capacitor is connected with the second interface of the first power.

5. The detection device of claim 1, wherein, The first control circuit comprises a relay, the relay comprises two connection contacts, and the chip controls the two connection contacts to be turned on or turned off to turn on or turn off the first load.

6. The detection device of claim 5, wherein, The first control circuit further comprises a third power port, a fourth diode and a triode, the relay comprises a coil, the first end of the coil is connected with the third power port, the second end of the coil is grounded, the cathode of the fourth diode is connected with the third power port, the anode of the fourth diode is connected with the collector of the triode, the emitter of the triode is grounded, and the base of the triode is connected with the chip.

7. The detection device of claim 6, wherein, The first control circuit comprises a seventh resistor and an eighth resistor, one end of the seventh resistor is connected with the chip, the other end of the seventh resistor is connected with the base of the triode, one end of the eighth resistor is connected with the base of the triode, and the other end of the eighth resistor is grounded.

8. A domestic appliance characterized in that, Comprise: a plurality of loads; The detection device of the load according to any one of claims 1-7, the connection end of the second resistor and the first interface in each of the detection devices are used for connecting two ends of one of the loads.

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