CN219715671U - Hardware detection circuit and refrigerator - Google Patents

Abstract

The utility model discloses a hardware detection circuit and a refrigerator, the hardware detection circuit comprises an electronic switch, a load controlled by the electronic switch, a load detection circuit for detecting loop current of the load, a signal processing circuit electrically connected with the load detection circuit, a controller with an input end electrically connected with the signal processing circuit and an output end electrically connected with the electronic switch, wherein the signal processing circuit further comprises an amplifying circuit and an optocoupler, the input end of the amplifying circuit is connected with the output end of the load detection circuit, the input end of the optocoupler is connected with the output end of the amplifying circuit, the output end of the optocoupler is connected with the controller, the optocoupler receives amplified signals output by the amplifying circuit and outputs waveform signals with different duty ratios to the controller, and the controller, the electronic switch, the load detection circuit and the signal processing circuit form a closed loop, so that the reliability of load work and the reliability of the whole machine are improved, and the fault load can be directly positioned and maintained by alarming and prompting faults.

Description

Hardware detection circuit and refrigerator

Technical Field

The utility model relates to the technical field of refrigerators, in particular to a hardware detection circuit and a refrigerator.

Background

At present, the controller for the refrigerator performs power supply on-off control on a strong electric load of the whole machine through the electronic switch, and referring to the control principle shown in fig. 1-2 taking the electronic switch as an electromagnetic relay as an example, it is obvious that the control on the load by the controller is open loop control, the controller cannot know the working state of the load and whether the load fails, and this can lead to the controller not to alarm and prompt the failed load, so that the refrigerator has at least the following problems: 1. when the refrigerator complete machine performs factory detection, in order to ensure that the load of the complete machine is normal when the refrigerator complete machine leaves the factory, an additional auxiliary detection device (such as a power tester) is required to judge whether the load normally works, which increases the equipment cost and the detection difficulty of the production line, and a flow chart for detecting the load of the complete machine is described by taking the power tester as an example with reference to fig. 3; 2. when a part is in fault in the process of using the refrigerator by a user, if the refrigerator cannot refrigerate due to the fact that the compressor is in fault, the frosting of an evaporator is serious and the refrigerating effect of the refrigerator is poor due to the fact that the defrosting heater is in fault, the basic function of the whole refrigerator is poor or lost due to the fact that the load is in fault and maintenance cannot be performed in time, the stored food of the user is deteriorated, and finally user complaints are caused; 3. when maintenance personnel overhauls the refrigerator, the maintenance personnel need to check faults and position fault parts by means of related instruments and meters, so that the maintenance difficulty of the whole refrigerator is increased.

In the related art, although a technical scheme of judging the load operation condition by detecting the parameters of the load is proposed, the judgment cannot be performed according to the operation condition and the fault condition of the loads with different powers.

In view of this, the present utility model has been proposed.

Disclosure of Invention

The utility model provides a hardware detection circuit and a refrigerator, wherein the hardware detection circuit forms a closed loop by an electronic switch, a load detection circuit, a signal processing circuit and a controller, and the signal processing circuit is arranged into an amplifying circuit and an optical coupler, and the optical coupler can receive an amplifying signal output by the amplifying circuit and output waveforms with different duty ratios to the controller through the on-off of the optical coupler so that the controller can judge whether loads with different powers have faults according to the duty ratios.

The present embodiment proposes a hardware detection circuit including:

an electronic switch electrically connected with the alternating current power supply;

the input end of the load is electrically connected with the electronic switch, and the load is connected with or disconnected from the alternating current power supply through the on-off of the electronic switch;

the load detection circuit is electrically connected with the load and is used for detecting loop current of the load;

the signal processing circuit is electrically connected with the load detection circuit and is used for processing the received electric signal output by the load detection circuit;

the input end of the controller is electrically connected with the signal processing circuit, the output end of the controller is electrically connected with the electronic switch, and the controller, the electronic switch, the load detection circuit and the signal processing circuit form a closed loop;

the signal processing circuit includes:

the input end of the amplifying circuit is connected with the output end of the load detection circuit and is used for amplifying the received electric signal;

the input end of the optical coupler is electrically connected with the output end of the amplifying circuit, the output end of the optical coupler is electrically connected with the controller, and the optical coupler receives the amplified signals output by the amplifying circuit and outputs waveform signals with different duty ratios to the controller through the on-off of the optical coupler.

In the above embodiment, the loop current of the load is detected by the load detection circuit, amplified by the amplifying circuit, and isolated by the optocoupler to obtain waveforms with different duty ratios, and the controller can compare the duty ratio with the lower limit of the duty ratio set by the corresponding load to determine whether the load has a fault, thereby improving the reliability of the load operation and the reliability of the whole machine, and providing guidance information for maintaining the load.

In some embodiments, the load detection circuit includes:

the first pin of the common mode inductor is connected with a zero line, the second pin of the common mode inductor is connected with a live wire, the third pin of the common mode inductor is electrically connected with a load, and the fourth pin of the common mode inductor is electrically connected with an electronic switch;

the first end of the first capacitor is electrically connected with the third pin of the common-mode inductor, and the second end of the first capacitor is electrically connected with the fourth pin of the common-mode inductor.

In some embodiments, the amplifying circuit is configured as a proportional amplifying circuit or a differential amplifying circuit.

In some embodiments, the amplifying circuit is configured as a differential amplifying circuit, and an input terminal of the differential amplifying circuit is connected to the first pin and the third pin of the common mode inductor.

In some embodiments, the differential amplification circuit includes:

the input end of the first filter circuit is electrically connected with the first pin of the common-mode inductor;

the input end of the second filter circuit is electrically connected with the first end of the first capacitor;

the first input end of the operational amplifier module is electrically connected with the output end of the first filter circuit, the second input end of the operational amplifier module is electrically connected with the output end of the second filter circuit, and the output end of the operational amplifier module is electrically connected with the input end of the optocoupler.

In some embodiments, the op-amp module is configured as a dual op-amp.

In some embodiments, the load is provided in multiple.

In some embodiments, the system further comprises a display panel electrically connected with the controller, wherein the display panel receives fault codes output by the controller and displays fault prompts on the display panel.

In some embodiments, the electronic switch is provided as an electromagnetic relay, a solid state relay, or a thyristor.

The embodiment also provides a refrigerator, which comprises the hardware detection circuit.

Drawings

FIG. 1 is a block diagram showing a hardware configuration of load control in the related art;

FIG. 2 shows a schematic diagram of the connection of an electronic switch and a load in the related art;

FIG. 3 shows a flow chart of the operation of load detection in the related art;

FIG. 4 illustrates a hardware block diagram of a hardware detection circuit according to some embodiments;

FIG. 5 illustrates a circuit schematic of a load detection circuit according to some embodiments;

FIG. 6 illustrates a block diagram of the hardware architecture of a signal processing circuit according to some embodiments;

FIG. 7 illustrates a circuit schematic of a signal processing circuit according to some embodiments;

FIG. 8 illustrates an internal schematic diagram of an op-amp module according to some embodiments;

FIG. 9 illustrates a waveform schematic of an amplified output signal after isolation by an optocoupler during operation of a load according to some embodiments;

FIG. 10 illustrates a schematic waveform of an amplified output signal of a further load during operation, according to some embodiments, isolated by an optocoupler;

FIG. 11 illustrates a waveform schematic of an amplified output signal of a further load during operation with optocouplers according to some embodiments;

fig. 12 illustrates a flow chart of load detection of a refrigerator according to some embodiments;

FIG. 13 illustrates a connection schematic of an electronic switch and a load according to some embodiments;

in the above figures:

a controller 1; a signal processing circuit 2; a load detection circuit 3; an electronic switch 4;

a load 5; an ac power supply 6; a display panel 7; a first capacitor CX1; common mode inductance LX1;

an optocoupler IC2; an amplifying circuit 21; a first filter circuit 211; a second filter circuit 212;

and an operational amplifier module IC1.

Detailed Description

For the purposes of making the objects and embodiments of the present utility model more apparent, an exemplary embodiment of the present utility model will be described in detail below with reference to the accompanying drawings in which exemplary embodiments of the present utility model are illustrated, it being apparent that the exemplary embodiments described are only some, but not all, of the embodiments of the present utility model.

It should be noted that the brief description of the terminology in the present utility model is for the purpose of facilitating understanding of the embodiments described below only and is not intended to limit the embodiments of the present utility model. Unless otherwise indicated, these terms should be construed in their ordinary and customary meaning.

The terms "first," second, "" third and the like in the description and in the claims and in the above drawings are used for distinguishing between similar or similar objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances.

The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to all elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.

To facilitate an understanding of the various embodiments of the present utility model, a block diagram of the hardware detection circuit is shown in fig. 4. As shown in fig. 4, the hardware detection circuit includes an electronic switch 4, a load 5, a load detection circuit 3, a signal processing circuit 2 and a controller 1, wherein the electronic switch 4 is electrically connected with an ac power supply 6, an input end of the load 5 is electrically connected with the electronic switch 4, and connection or disconnection of the load 5 and the ac power supply 6 is controlled by on-off of the electronic switch 4; the load detection circuit 3 is electrically connected with the load 5, so that the load detection circuit 3 detects the working current (loop current) of the load 5, the signal processing circuit 2 is electrically connected with the load detection circuit 3, the input end of the controller 1 is electrically connected with the signal processing circuit 2, the output end of the controller 1 is electrically connected with the electronic switch 4, the signal processing circuit 2 receives the electric signal with the loop current information output by the load detection circuit 3 to process, and the processed electric signal is fed back to the controller 1, so that the controller 1 can conveniently judge the working state of the load 5, and the state of the electronic switch 4 and thus the working state of the load 5 can be better controlled.

The controller 1, the electronic switch 4, the load 5, the load detection circuit 3 and the signal processing circuit 2 form a closed loop, the load detection circuit 3 feeds back the operation condition of the load 5 by detecting the loop current of the load 5, meanwhile, the signal processing circuit 2 feeds back the processed electric signal to the controller 1, and the controller 1 judges whether the corresponding load 5 fails according to the fed-back electric signal.

It should be noted that, the above-mentioned hardware detection circuit may detect a plurality of loads 5, for example, a refrigerator, and all the strong electric loads 5 of the refrigerator may share one hardware detection circuit.

Through the arrangement, the utility model is improved in the aspect of hardware circuit design of the control board PCBA, compared with the structure shown in fig. 1, with reference to fig. 4, the improved controller 1 is provided with the load detection circuit 3 and the signal processing circuit 2 at the control end of the load 5, and the detected working current of the load 5 is amplified and fed back to the controller 1 to form a closed loop for controlling the load 5, so that the working reliability of the load 5 and the reliability of the whole machine are improved.

In some implementations of this embodiment, the signal processing circuit 2 further includes an amplifying circuit 21 and an optocoupler IC2, where an input end of the amplifying circuit 21 is connected to an output end of the load detecting circuit 3, an input end of the optocoupler IC2 is connected to an output end of the amplifying circuit 21, an output end of the optocoupler IC2 is connected to the controller 1, the amplifying circuit 21 is configured to amplify an electrical signal output by the load detecting circuit 3, and input the amplified electrical signal to the optocoupler IC2, the optocoupler IC2 conducts or cuts off the waveform signal according to its own characteristics according to the electrical signal to output the waveform signal with different duty ratios to the MCU CHECK of the controller 1, and the controller 1 determines whether the corresponding load 5 fails according to the waveform signal with different duty ratios.

In the above embodiment, the front end of the amplifying circuit 21 detects that the electric signal output by the load detecting circuit 3 is amplified and then is isolated and fed back to the controller 1 through the optocoupler IC2, and the controller 1 can determine whether the load 5 is in a fault state according to the feedback signal.

When the loads 5 with different powers are operated, the periods of the waveforms detected by the MCU CHECK of the control board are identical, and the periods of the detected waveforms are identical to the periods of the ac voltage, but the duty ratios thereof are different, and it should be noted that the low-level duty ratio Dul is mainly referred to herein. For example, referring to fig. 9-11, a waveform diagram of an amplified output signal of the ac load 5 is isolated by the optocoupler IC2 during operation, wherein fig. 9 is a waveform diagram of the load 5 when the power is 0W, fig. 10 is a waveform diagram of the load 5 when the power is 18W, and fig. 11 is a waveform diagram of the load 5 when the power is 95W.

According to the above hardware principle analysis, the comparison can be performed by reasonably setting the low-level duty ratio Dul of the waveform signal output by the optocoupler IC2 and the preset low-level duty ratio lower limit Dul min of the corresponding load 5, so as to determine whether the load 5 works normally.

In general, when the low-level duty ratio Dul is greater than the preset low-level duty ratio lower limit Dul min corresponding to the load 5, it is determined that the load 5 is working normally at this time, otherwise, it is determined that the load 5 is malfunctioning.

It should be noted that, the relationship between the power of the load 5 and the low-level duty ratio is nonlinear, and the preset low-level duty ratio lower limit may be generally determined by actually measuring and comparing the low-level duty ratio of the load 5 during normal operation. Because of the error of the device, the output offset of the amplifier is also existed, and the core improvement point of the utility model is to qualitatively judge the fault of the load 5, the low-level duty ratio does not need to be accurately calculated.

For example, assuming that the power of the press is 60W to 130W when the press is normally operated and the power of the defrosting heater is 140W when the defrosting heater is normally operated, the low-level duty ratio of the 20W load 5 when the load is normally operated can be set as a lower contrast limit according to the design rules of the margin, or different lower contrast limits are set for loads 5 with different powers. By actually measuring the duty ratio of the low level of the load 5 with the power of 20W as k, k can be set as the duty ratio lower limit, that is, when the duty ratio of the low level Dul is less than or equal to k, the load 5 is judged to be in the fault state.

In some implementations of the present embodiment, referring to fig. 5, the load detection circuit 3 includes a common-mode inductance LX1 and a first capacitance CX1, wherein the common-mode inductance LX1 includes four pins, respectively defined as a first pin, a second pin, a third pin, and a fourth pin, wherein the first pin is connected to a zero line, the second pin is connected to a hot line, the third pin is connected to a load 5, and the fourth pin is connected to an electronic switch 4; the first capacitor CX1 is connected in parallel with the common-mode inductor LX1, specifically, a first end of the first capacitor CX1 is electrically connected to the third pin of the common-mode inductor LX1, and a second end of the first capacitor CX1 is electrically connected to the fourth pin of the common-mode inductor LX 1. The connection is realized by connecting the common-mode inductor LX1 with the load 5 and the electronic switch 4 in series so as to detect the loop current of the loop where the load 5 is positioned.

The load detection circuit 3 may also be a different component, but is designed to detect the loop current of the load 5.

In some implementations of the present embodiment, the amplifying circuit 21 may be provided as a proportional amplifying circuit or a differential amplifying circuit.

In some implementations of this embodiment, when the amplifying circuit 21 is a differential amplifying circuit, an input terminal of the differential amplifying circuit is connected to the first pin and the third pin of the common-mode inductor LX 1. Specifically, an input end of the differential amplifying circuit is connected to a first pin of the common-mode inductor LX1 and a first end of the first capacitor CX 1.

When the load 5 is operated, the loop current forms a voltage drop recess at both ends of the common-mode inductance LX1, and the voltage drop Δu is used as an input signal of the post-stage amplification circuit 21.

In some implementations of the present embodiment, referring to fig. 6 to 7, the differential amplifying circuit further includes a first filter circuit 211, a second filter circuit 212, and an operational amplifier module IC1, where the first filter circuit 211 is electrically connected to a first pin of the common-mode inductor LX1, the second filter circuit 212 is electrically connected to a first pin of the first capacitor CX1, a first input end of the operational amplifier module IC1 is electrically connected to an output end of the first filter circuit 211, and a second input end of the operational amplifier module IC1 is electrically connected to an output end of the second filter circuit 212, and an output end of the operational amplifier module IC1 is electrically connected to an input end of the optocoupler IC2, so as to output the amplified electrical signal to the optocoupler IC2.

In some implementations of the present embodiment, the operational amplifier module IC1 may employ a component LM358DT, and the internal schematic diagram of the operational amplifier module IC1 refers to fig. 8, where LM358DT is a low-power dual-operation amplifier, and two independent high-gain internal frequency compensation operational amplifiers are included in the internal circuit LM358DT, that is, a two-stage amplifying circuit 21 is provided in the internal circuit LM358DT, and the voltage drop Δu output by the load detection circuit 3 is amplified in two stages by LM358DT to drive the optocoupler IC2.

In some implementations of the present embodiment, referring to fig. 4, the hardware detection circuit further includes a display panel 7, where the display panel 7 is electrically connected to the controller 1, and the display panel 7 receives the fault code output by the controller 1 and displays a fault prompt on the display panel 7.

Through setting up the display panel 7 with controller 1 electric connection and can receive fault code, can realize carrying out the warning suggestion to the load 5 of trouble, can directly fix a position trouble load 5, have the pointed guiding significance to the maintenance of the household electrical appliances who uses this circuit, promoted the portability of refrigerator complete machine maintenance.

When the load 5 fails, the controller 1 reports a corresponding failure code to the display panel 7, and the display panel 7 is used to give a failure indication, and when the load 5 is operating normally, the controller 1 does not send a failure code to the display panel 7, and the display panel 7 does not give a failure indication.

In some implementations of the present embodiment, the electronic switch 4 is provided as an electromagnetic relay, a solid state relay, and a thyristor. Illustratively, taking the electronic switch 4 as an electromagnetic relay as an example, referring to fig. 13, a first pin of the load 5 is electrically connected to N1 load of the load detection circuit 3, a first pin of the electromagnetic relay is connected to L1 load of the load detection circuit 3, and a second pin of the electromagnetic relay is connected to an output signal pin of the control board to receive an electrical signal for controlling the electromagnetic relay.

In this embodiment, a refrigerator is also provided, and the refrigerator uses the hardware detection circuit to perform fault detection on the load 5, so as to ensure normal operation of the whole refrigerator and provide guiding information for fault maintenance.

The load 5 may be provided as a compressor and an expansion valve to ensure the refrigerating effect of the whole refrigerator.

The refrigerator utilizes a compressor, a condenser, an expansion valve and an evaporator to execute a refrigerating and heating cycle of the refrigerator, wherein the refrigerating cycle and the heating cycle comprise a compression process, a condensation process, an expansion process and an evaporation process, and cold or heat is provided for an indoor space through heat absorption and release processes of a refrigerant, so that the temperature regulation of the indoor space is realized.

In the refrigerator working process, the compressor compresses refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed high-temperature high-pressure gaseous refrigerant into liquid refrigerant, and heat is released to the surrounding environment through the condensation process. The liquid refrigerant flowing out of the condenser enters an expansion valve, and the expansion valve expands the liquid refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid refrigerant. The low-pressure liquid refrigerant flowing out of the expansion valve enters the evaporator, absorbs heat when the liquid refrigerant flows through the evaporator, evaporates into low-temperature low-pressure refrigerant gas, and returns the refrigerant gas in a low-temperature low-pressure state to the compressor. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The refrigerator can adjust the temperature of the indoor space throughout the cycle.

Besides the above, the load 5 may also be set as a fan, which is disposed inside the refrigerator and is used for assisting the airflow circulation inside the air conditioner.

The refrigerator has a display panel 7, when the load 5 is in fault, the controller 1 reports the corresponding fault code to the display panel 7, fault prompt is carried out by utilizing the display panel 7, when the load 5 is in normal operation, the controller 1 does not send the fault code to the display panel 7, and the display panel 7 does not carry out fault prompt.

It should be noted that, the time when the load 5 starts to be detected may be a specific factory detection mode or may be detected at any time during normal use of the user.

Referring to fig. 11, the refrigerator has a plurality of loads 5, and a plurality of loads 5 are defined as a first load, a second load, …, respectively, and a control method of the hardware detection circuit applied in the refrigerator is illustrated by setting three loads 5 as an example.

Firstly, judging whether the refrigerator enters a load 5 detection mode or not (step S1);

in the step S1, the refrigerator enters a load 5 detection mode, then step S2 is executed, and the controller 1 controls the first load to work independently in the time t 1; judging whether the low-level duty ratio Dul output by the optocoupler IC2 is greater than a lower limit threshold preset dul_minu of the low-level duty ratio of the first load (step S3);

in step S3, the low-level duty cycle DuI output by the optocoupler IC2 is greater than the lower limit threshold preset Dul of the low-level duty cycle of the first load, step S4 is executed, the first load works normally, and step S6 is executed;

in step S3, the low-level duty ratio Dul output by the optocoupler IC2 is not greater than the lower limit threshold preset Dul of the low-level duty ratio of the first load, step S5 is executed, the first load fails, the fault code is repaired or reported, and step S6 is executed;

the controller 1 controls the second load to operate alone in the time t1 (step S6); judging whether the low-level duty ratio Dul output by the optocoupler IC2 is greater than a lower limit threshold preset dul_minub of the second load low-level duty ratio (step S7);

in step S7, the low level duty ratio Dul output by the optocoupler IC2 is greater than the lower limit threshold preset dul_minb of the low level duty ratio of the second load, step S8 is executed, the second load works normally, and step S10 is executed;

in step S7, the low-level duty ratio Dul output by the optocoupler IC2 is not greater than the lower limit threshold preset dul_minb of the low-level duty ratio of the second load, step S9 is executed, the second load fails, and the fault code is repaired or reported, and step S10 is executed;

the controller 1 controls the third load to operate alone in the time t1 (step S10); judging whether the low-level duty ratio Dul output by the optocoupler IC2 is greater than a lower-limit threshold preset dul_minc of the third load low-level duty ratio (step S11);

in step S11, the low level duty ratio Dul output by the optocoupler IC2 is greater than the lower limit threshold preset Dul minC of the low level duty ratio of the third load, step S12 is executed, the third load works normally, and then the process is ended;

in step S11, the low-level duty ratio Dul output by the optocoupler IC2 is not greater than the lower limit threshold preset Dul minC of the low-level duty ratio of the third load, step S13 is executed, the third load fails, and the fault code is repaired or reported, and then the process is ended;

in step S1, the refrigerator does not enter the load 5 detection mode, and the process ends.

It will be appreciated that although the above is performed in the order of the first load, the second load, and the third load, it is of course possible to perform the detection in other predetermined orders.

It should be noted that the hardware detection circuit provided in the embodiment of the present utility model may have various implementation forms, and may be applied to a washing machine, an air conditioner, and the like, in addition to a refrigerator.

The embodiment of the utility model provides a hardware detection circuit and a refrigerator, the hardware detection circuit comprises an electronic switch 4, a load 5 controlled by the electronic switch 4, a load detection circuit 3 for detecting loop current of the load 5, a signal processing circuit 2 electrically connected with the load detection circuit 3, and a controller 1 with an input end electrically connected with the signal processing circuit 2 and an output end electrically connected with the electronic switch 4, wherein the signal processing circuit 2 further comprises an amplifying circuit 21 and an optocoupler IC2, the input end of the amplifying circuit 21 is connected with the output end of the load detection circuit 3, the input end of the optocoupler IC2 is connected with the output end of the amplifying circuit 21, the output end of the optocoupler IC2 is connected with the controller 1, the optocoupler IC2 receives amplified signals output by the amplifying circuit 21 and outputs waveform signals with different duty ratios to the controller 1 through the on-off of the optocoupler IC2, the controller 1, the electronic switch 4, the load 5, the load detection circuit 3 and the signal processing circuit 2 form a closed loop, the reliability of the work of the load 5 and the whole machine are improved, and the fault 5 can be directly positioned by alarming and prompting faults.

The utility model can detect whether the load 5 has faults during the working period of the refrigerator strong electric load 5 by combining a hardware circuit with a corresponding software method, and if the load 5 has faults, the fault state is reported to the display panel 7 of the refrigerator to prompt a user to report or guide after-sale maintenance.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed above. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles and the practical application, to thereby enable others skilled in the art to best utilize the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.

Claims (10)

1. A hardware detection circuit, comprising:

an electronic switch electrically connected with the alternating current power supply;

the input end of the load is electrically connected with the electronic switch, and the load is connected with or disconnected from the alternating current power supply through the on-off of the electronic switch;

the load detection circuit is electrically connected with the load and is used for detecting loop current of the load;

the signal processing circuit is electrically connected with the load detection circuit and is used for processing the received electric signal output by the load detection circuit;

the input end of the controller is electrically connected with the signal processing circuit, the output end of the controller is electrically connected with the electronic switch, and the controller, the electronic switch, the load detection circuit and the signal processing circuit form a closed loop;

the signal processing circuit includes:

the input end of the amplifying circuit is connected with the output end of the load detection circuit and is used for amplifying the received electric signal;

the input end of the optical coupler is electrically connected with the output end of the amplifying circuit, the output end of the optical coupler is electrically connected with the controller, and the optical coupler receives the amplified signals output by the amplifying circuit and outputs waveform signals with different duty ratios to the controller.

2. The hardware detection circuit of claim 1, wherein the load detection circuit comprises:

the first pin of the common mode inductor is connected with a zero line, the second pin of the common mode inductor is connected with a live wire, the third pin of the common mode inductor is electrically connected with the load, and the fourth pin of the common mode inductor is electrically connected with the electronic switch;

the first end of the first capacitor is electrically connected with the third pin of the common-mode inductor, and the second end of the first capacitor is electrically connected with the fourth pin of the common-mode inductor.

3. The hardware detection circuit according to claim 2, wherein the amplification circuit is configured as a proportional amplification circuit or a differential amplification circuit.

4. A hardware detection circuit according to claim 3, wherein the amplifying circuit is configured as a differential amplifying circuit, and an input terminal of the differential amplifying circuit is connected to the first pin and the third pin of the common mode inductor.

5. The hardware detection circuit of claim 4, wherein the differential amplification circuit comprises:

the input end of the first filter circuit is electrically connected with the first pin of the common mode inductor;

the input end of the second filter circuit is electrically connected with the first end of the first capacitor;

the first input end of the operational amplifier module is electrically connected with the output end of the first filter circuit, the second input end of the operational amplifier module is electrically connected with the output end of the second filter circuit, and the output end of the operational amplifier module is electrically connected with the input end of the optocoupler.

6. The hardware detection circuit of claim 5, wherein the op-amp module is configured as a dual op-amp.

7. The hardware detection circuit of claim 6, wherein the load is provided in a plurality.

8. The hardware detection circuit of claim 1, further comprising a display panel electrically coupled to the controller, the display panel receiving the fault code output by the controller and displaying a fault alert on the display panel.

9. The hardware detection circuit of claim 8, wherein the electronic switch is configured as an electromagnetic relay, a solid state relay, or a thyristor.

10. A refrigerator comprising the hardware detection circuit of any one of claims 1-9.