Control circuit for compressor and storage equipment

Abstract

The utility model relates to the technical field of household appliances, and discloses a control circuit for a compressor and storage equipment. The control circuit comprises: a first switching circuit, the input end of which is connected with a live wire; the input end of the second switching circuit is connected with the output end of the first switching circuit, and the output end is connected with the first end of the compressor; the input end of the third switching circuit is connected with the output end of the first switching circuit, and the output end is connected with the first end of the compressor; wherein the first switching circuit is in a normally-on state, and the second switching circuit and the third switching circuit alternately control start and stop of the compressor; under the condition that the second switching circuit or the third switching circuit has a pull-in fault, the normal switching circuit controls the start and stop of the compressor; and under the condition that the second switching circuit or the third switching circuit has a disconnection fault, the normal switching circuit is controlled to be closed, and the first switching circuit controls the start and stop of the compressor. The reliability of starting and stopping control of the compressor can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of household electrical appliances, for example, to a control circuit and a storage device for a compressor. Background Art

[0002] At present, compressors are widely used in storage equipment (for example, wine cabinets, refrigerators, freezers or thermostats, etc.) In order to better ensure the internal temperature and humidity of the storage equipment to ensure the preservation effect of the stored items, the compressor needs to be frequently controlled to start and stop.

[0003] In the related art, the start and stop of the compressor is usually controlled by closing and opening a relay connected to the compressor. However, during the high-frequency closing and opening process of the relay, it is very easy to have a closing or opening failure. This results in low reliability of the start and stop control of the compressor.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0005] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0006] The disclosed embodiment provides a control circuit and storage device for a compressor, which can improve the reliability of the start-stop control of the compressor.

[0007] In some embodiments, the first end of the compressor is connected to the live wire through a control circuit, and the second end of the compressor is connected to the neutral wire; the control circuit for the compressor includes: a first switch circuit, whose input end is connected to the live wire; a second switch circuit, whose input end is connected to the output end of the first switch circuit, and whose output end is connected to the first end of the compressor; a third switch circuit, whose input end is connected to the output end of the first switch circuit, and whose output end is connected to the first end of the compressor; wherein the first switch circuit is in a normally on state, and the start and stop of the compressor are alternately controlled by the second switch circuit and the third switch circuit; when there is a pull-in fault in the second switch circuit or the third switch circuit, the start and stop of the compressor are controlled by the normal switch circuit; when there is a disconnection fault in the second switch circuit or the third switch circuit, the normal switch circuit is controlled to be pulled in, and the start and stop of the compressor are controlled by the first switch circuit.

[0008] Optionally, the first switch circuit, the second switch circuit and the third switch circuit all include a relay and a control unit; the relay includes a switch element and a control coil, the first end of the switch element is the input end of the switch circuit, and the second end of the switch element is the output end of the switch circuit; the first end of the control coil is connected to the first control power supply, and the second end of the control coil is connected to the output end of the control unit; the input end of the control unit is connected to the main control chip of the equipment where the compressor works.

[0009] Optionally, the control unit includes: a transistor, the collector of the transistor is connected to the second end of the control coil, and the emitter of the transistor is connected to the ground wire; a first resistor, the first end of the first resistor is connected to the base of the transistor, and the second end of the first resistor serves as an input end of the control unit; a second resistor, the first end of the second resistor is connected to the emitter of the transistor, and the second end of the second resistor is connected to the base of the transistor.

[0010] Optionally, the control unit further includes: a first diode, a first end of the first diode is connected to the second end of the control coil, and the second end of the first diode is connected to the first end of the control coil.

[0011] Optionally, the control circuit further includes: a protection unit, one end of which is connected to the live wire, and the other end of which is connected to the output end of the second switch circuit or the third switch circuit; the protection unit is used to absorb the high voltage generated when the compressor is disconnected.

[0012] Optionally, the protection unit includes: a first capacitor, a first end of the first capacitor is connected to the live wire; a third resistor, a first end of the third resistor is connected to the second end of the first capacitor, and a second end of the third resistor is connected to the output end of the second switching circuit or the third switching circuit.

[0013] Optionally, the control circuit also includes: a detection unit, a first input end of the detection unit is connected to the first end of the compressor, a second input end of the detection unit is connected to the neutral line, and an output end of the detection unit is connected to the main control chip of the equipment where the compressor works; the detection unit is used to detect the working state of the compressor and generate a feedback signal to output to the main control chip of the equipment where the compressor works.

[0014] Optionally, the detection unit includes: an optocoupler, a first input end of the optocoupler is connected to the first end of the compressor, a second input end of the optocoupler is connected to the neutral line, a first output end of the optocoupler is connected to the main control chip of the device on which the compressor works, and a second output end of the optocoupler is connected to the ground line; a pull-up resistor, a first end of the pull-up resistor is connected to the second control power supply, and a second end of the pull-up resistor is connected to the first output end of the optocoupler.

[0015] Optionally, the detection unit also includes: a current limiting resistor, a first end of the current limiting resistor is connected to the first end of the compressor, and a second end of the current limiting resistor is connected to the first input end of the optocoupler; a second diode, a first end of the second diode is connected to the neutral line, and a second end of the second diode is connected to the first input end of the optocoupler; a fourth resistor, a first end of the fourth resistor is connected to the second end of the pull-up resistor, and a second end of the fourth resistor is connected to the main control chip of the device on which the compressor works; a second capacitor, a first end of the second capacitor is connected to the second end of the fourth resistor, and a second end of the second capacitor is connected to the ground wire.

[0016] In some embodiments, a storage device includes: a device body; a compressor, which is arranged on the device body, wherein a first end of the compressor is connected to a live wire via a control circuit for the compressor as described above, and a second end of the compressor is connected to a neutral wire.

[0017] The control circuit and storage device for a compressor provided by the embodiments of the present disclosure can achieve the following technical effects:

[0018] In the disclosed embodiment, the first end of the compressor is connected to the live wire through the control circuit for the compressor, and the second end of the compressor is connected to the neutral wire. The control circuit for the compressor includes three switch circuits, wherein the input end of the first switch circuit is connected to the live wire, the input ends of the second switch circuit and the third switch circuit are both connected to the output end of the first switch circuit, and the output ends of the second switch circuit and the third switch circuit are both connected to the first end of the compressor. Specifically, when there is no fault in the first switch circuit, the second switch circuit and the third switch circuit, the first switch circuit is in a normally on state, and the start and stop of the compressor are alternately controlled by the second switch circuit and the third switch circuit. In this way, the frequency of each switch circuit being attracted and disconnected can be reduced, and the risk of switch circuit failure is reduced. In the case of a pull-in fault in the second switch circuit or the third switch circuit, the start and stop of the compressor is controlled by a normal switch circuit; in the case of a disconnection fault in the second switch circuit or the third switch circuit, the normal switch circuit is controlled to be attracted, and the start and stop of the compressor is controlled by the first switch circuit. In this way, even if the second switch circuit or the third switch circuit fails, the control circuit can normally control the start and stop of the compressor. Therefore, the disclosed embodiment can improve the reliability of the start-stop control of the compressor, and further can ensure the storage effect of the storage device using this control circuit for the compressor on the items stored therein.

[0019] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0021] Figure 1 A schematic diagram of a control circuit for a compressor provided by an embodiment of the present disclosure;

[0022] Figure 2 A schematic diagram of another control circuit for a compressor provided by an embodiment of the present disclosure;

[0023] Figure 3 A schematic diagram of another control circuit for a compressor provided by an embodiment of the present disclosure;

[0024] Figure 4 A schematic diagram of another control circuit for a compressor provided by an embodiment of the present disclosure;

[0025] Figure 5 A schematic diagram of another control circuit for a compressor provided by an embodiment of the present disclosure;

[0026] Figure 6 A schematic diagram of a storage device provided in an embodiment of the present disclosure.

[0027] Description of reference numerals:

[0028] 10. Control circuit for compressor;

[0029] 100, first switch circuit; 200, second switch circuit; 300, third switch circuit; 110, relay; 111, switch element; 112, control coil; 120, control unit; 121, transistor; 122, first resistor; 123, second resistor; 124, first diode; 400, protection unit; 410, first capacitor; 420, third resistor; 500, detection unit; 510, optocoupler; 520, pull-up resistor; 530, current limiting resistor; 540, second diode; 550, fourth resistor; 560, second capacitor;

[0030] 600. Storage device; 610. Device body; 620. Compressor. DETAILED DESCRIPTION

[0031] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0032] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0033] Unless otherwise stated, the term "plurality" means two or more.

[0034] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0035] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0036] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0038] The control circuit 10 for a compressor provided in the embodiment of the present disclosure (hereinafter referred to as the control circuit 10) is as follows: Figures 1 to 5As shown, the first end of the compressor is connected to the live wire through the control circuit 10, and the second end of the compressor is connected to the neutral wire. The control circuit 10 includes a first switch circuit 100, a second switch circuit 200 and a third switch circuit 300. The input end of the first switch circuit 100 is connected to the live wire. The input end of the second switch circuit 200 is connected to the output end of the first switch circuit 100, and the output end of the second switch circuit 200 is connected to the first end of the compressor. The input end of the third switch circuit 300 is connected to the output end of the first switch circuit 100, and the output end of the third switch circuit 300 is connected to the first end of the compressor. Among them, the first switch circuit 100 is in a normally-on state, and the start and stop of the compressor are alternately controlled by the second switch circuit 200 and the third switch circuit 300; when there is a pull-in fault in the second switch circuit 200 or the third switch circuit 300, the start and stop of the compressor are controlled by the normal switch circuit; when there is a disconnection fault in the second switch circuit 200 or the third switch circuit 300, the normal switch circuit is controlled to be pulled in, and the start and stop of the compressor are controlled by the first switch circuit 100.

[0039] Specifically, by connecting the input end of the first switch circuit 100 to the live wire, the input ends of the second switch circuit 200 and the third switch circuit 300 are connected to the output end of the first switch circuit 100, and the output ends of the second switch circuit 200 and the third switch circuit 300 are connected to the first end of the compressor. When the first switch circuit 100 is in the on state, the start and stop of the compressor can be controlled by the second switch circuit 200 or the third switch circuit 300. When the second switch circuit 200 and / or the third switch circuit 300 are in the on state, the start and stop of the compressor can be controlled by the first switch circuit 100.

[0040] Specifically, based on the structure of the above-mentioned control circuit 10, when there is no fault in the first switch circuit 100, the second switch circuit 200 and the third switch circuit 300, the embodiment of the present disclosure can reduce the frequency of each switch circuit being closed and disconnected, and reduce the risk of each switch circuit having a closing and disconnecting fault by controlling the first switch circuit 100 to be in a normally on state and alternately controlling the start and stop of the compressor by the second switch circuit 200 and the third switch circuit 300.

[0041] Specifically, based on the structure of the control circuit 10, when there is a pull-in fault in the second switch circuit 200 or the third switch circuit 300, the embodiment of the present disclosure can control the first switch circuit 100 to be in a normally-on state, and the switch circuit without the pull-in fault in the second switch circuit 200 and the third switch circuit 300 continues to control the start and stop of the compressor. When there is a disconnection fault in the second switch circuit 200 or the third switch circuit 300, the embodiment of the present disclosure can control the switch circuit without the disconnection fault in the second switch circuit 200 and the third switch circuit 300 to be in a conducting state, and the start and stop of the compressor is controlled by the first switch circuit 100. In this way, even if the second switch circuit 200 or the third switch circuit 300 fails, the control circuit 10 can still control the start and stop of the compressor normally.

[0042] In the embodiment of the present disclosure, when there is no fault in the first switch circuit 100, the second switch circuit 200 and the third switch circuit 300, the first switch circuit 100 can be placed in a normally-on state, and the second switch circuit 200 and the third switch circuit 300 can be used to alternately control the start and stop of the compressor, thereby reducing the frequency of each switch circuit being attracted and disconnected, and reducing the risk of failure of the switch circuit. In the case of a fault in the second switch circuit 200 or the third switch circuit 300, the control circuit 10 can continue to normally control the start and stop of the compressor by adjusting the conduction state of the first switch circuit 100 and the conduction state of the switch circuits that do not have a fault in the second switch circuit 200 and the third switch circuit 300. Therefore, the embodiment of the present disclosure can improve the reliability of the start and stop control of the compressor, and further ensure the storage device using the control circuit 10 for the compressor can preserve the stored items therein.

[0043] like Figure 2 As shown in the figure (K represents a pin point of the main control chip), in some embodiments, the first switch circuit 100, the second switch circuit 200 and the third switch circuit 300 all include a relay 110 and a control unit 120. The relay 110 includes a switch element 111 and a control coil 112, the first end of the switch element 111 is the input end of the switch circuit, and the second end of the switch element 111 is the output end of the switch circuit. The first end of the control coil 112 is connected to the first control power supply, and the second end of the control coil 112 is connected to the output end of the control unit 120; the input end of the control unit 120 is connected to the main control chip of the device where the compressor works.

[0044] Specifically, the first switch circuit 100, the second switch circuit 200 and the third switch circuit 300 have the same circuit structure, and each switch circuit includes a relay 110 and a control unit 120. Specifically, the control unit 120 is used to control the relay 110 to be closed or disconnected according to an input control signal.

[0045] Specifically, the supply voltage of the first control power source corresponds to the control voltage of the relay 110 . For example, if the control voltage of the relay 110 is 12V, the first control power source is a power source capable of providing a 12V voltage.

[0046] Specifically, the input end of the control unit 120 is connected to the main control chip of the equipment where the compressor works, and the output end of the control unit 120 is connected to the control coil 112 of the relay 110. It is possible to control the disconnection and attraction of the switch element 111 based on the program built into the main control chip. When there is no fault in the first switch circuit 100, the second switch circuit 200 and the third switch circuit 300, the first switch circuit 100, the second switch circuit 200 and the third switch circuit 300 can be controlled according to the above scheme, reducing the frequency of attraction and disconnection of each switch circuit and reducing the risk of failure of the switch circuit. When there is a fault in the second switch circuit 200 or the third switch circuit 300, the first switch circuit 100 can be controlled according to the above scheme, and there is no faulty switch circuit in the second switch circuit 200 and the third switch circuit 300, so that the control circuit 10 can continue to control the start and stop of the compressor normally. In this way, the reliability of the start and stop control of the compressor is improved.

[0047] like Figure 3 As shown in the figure (K in the figure represents a pin point of the main control chip), in some embodiments, the control unit 120 includes a transistor 121, a first resistor 122 and a second resistor 123. The collector of the transistor 121 is connected to the second end of the control coil 112, and the emitter of the transistor 121 is connected to the ground wire. The first end of the first resistor 122 is connected to the base of the transistor 121, and the second end of the first resistor 122 serves as the input end of the control unit 120. The first end of the second resistor 123 is connected to the emitter of the transistor 121, and the second end of the second resistor 123 is connected to the base of the transistor 121.

[0048] Specifically, by connecting the collector of the transistor 121 to the second end of the control coil 112, connecting the base of the transistor 121 to the main control chip of the compressor working equipment through the first resistor 122, grounding the emitter of the transistor 121, and connecting the base and emitter of the transistor 121 through the second resistor 123. When the main control chip inputs a control signal, the collector and emitter of the transistor 121 will be turned on, so that the first end of the control coil 112 is at a low level, and the voltage across the two ends of the control coil 112 is the voltage of the first control power supply. At this time, the control coil 112 can make the switch 111 pull in. When the main control chip does not input a control signal, the collector and emitter of the transistor 121 are not turned on, and the voltage across the two ends of the control coil 112 is 0V. At this time, the control coil 112 can make the switch 111 disconnect.

[0049] Specifically, by providing the first resistor 122 , the interference of noise signals on the operation of the transistor 121 can be reduced, thereby preventing the transistor 121 from malfunctioning.

[0050] Specifically, by providing the second resistor 123 , a bias voltage can be provided for the transistor 121 , thereby ensuring the working stability of the transistor 121 .

[0051] In the embodiment of the present disclosure, by setting the transistor 121, the first resistor 122 and the second resistor 123, the control signal based on the main control chip input of the compressor working equipment is realized to control the closing and opening of the relay 110, thereby realizing the control of the conduction state of the first switch circuit 100, the second switch circuit 200 and the third switch circuit 300.

[0052] like Figure 3 As shown (K in the figure represents a pin point of the main control chip), in some embodiments, the control unit 120 further includes a first diode 124. The first end of the first diode 124 is connected to the second end of the control coil 112, and the second end of the first diode 124 is connected to the first end of the control coil 112.

[0053] Specifically, a first diode 124 is connected in parallel at both ends of the control coil 112, and the positive terminal (i.e., the first end) of the first diode 124 is connected to the second end of the control coil 112, and the negative terminal (i.e., the second end) of the first diode 124 is connected to the first end of the control coil 112. At the moment when the relay 110 is switched from closed to open, the first diode 124 can provide a freewheeling circuit for the control coil 112 of the relay 110, so that the voltage at both ends of the control coil 112 is clamped at a very low voltage. In this way, the risk of breakdown of the collector and emitter of the transistor 121 due to excessive voltage can be reduced, thereby improving the safety and reliability of the operation of the transistor 121.

[0054] like Figure 4 As shown in the figure (K in the figure represents a pin point of the main control chip), in some embodiments, the control circuit 10 further includes a protection unit 400. One end of the protection unit 400 is connected to the live wire, and the other end is connected to the output end of the second switch circuit 200 or the third switch circuit 300. The protection unit 400 is used to absorb the high voltage generated when the compressor is disconnected.

[0055] Specifically, by providing the protection unit 400, the high voltage generated when the compressor is disconnected can be absorbed at the moment the compressor is disconnected, thereby reducing the risk of arcing in the relay 110 in the second switch circuit 200 and the third switch circuit 300, thereby causing the relay 110 to stick.

[0056] Optionally, the protection unit 400 includes a first capacitor 410 and a third resistor 420. The first end of the first capacitor 410 is connected to the live wire. The first end of the third resistor 420 is connected to the second end of the first capacitor 410, and the second end of the third resistor 420 is connected to the output end of the second switch circuit 200 or the third switch circuit 300.

[0057] Specifically, the first end of the first capacitor 410 is connected to the live wire, the first end of the third resistor 420 is connected to the second end of the first capacitor 410, and the second end of the third resistor 420 is connected to the output end of the second switch circuit 200 or the third switch circuit 300. In essence, the first capacitor 410 and the third resistor 420 are connected in series and then connected in parallel with the switch element 111 of the relay 110 of the second switch circuit 200 or the third switch circuit 300. Since the parallel resistor has a voltage dividing function, the parallel capacitor has a charging and discharging function.

[0058] Therefore, the embodiment of the present disclosure sets the first capacitor 410 and the third resistor 420 according to the above connection relationship, which can absorb the high voltage generated at the moment when the compressor is disconnected. In this way, the risk of arcing of the relay 110 in the second switch circuit 200 and the third switch circuit 300, which causes the relay 110 to stick, is reduced.

[0059] like Figure 5 As shown in the figure (K in the figure represents a pin point of the main control chip), in some embodiments, the control circuit 10 also includes a detection unit 500. The first input end of the detection unit 500 is connected to the first end of the compressor, the second input end of the detection unit 500 is connected to the neutral line, and the output end of the detection unit 500 is connected to the main control chip of the device where the compressor works. The detection unit 500 is used to detect the working state of the compressor and generate a feedback signal to output to the main control chip of the device where the compressor works.

[0060] Specifically, by connecting the first input terminal of the detection unit 500 to the first terminal of the compressor and connecting the second input terminal of the detection unit 500 to the neutral line, the detection unit 500 can confirm the working state of the compressor based on the detected voltage. By connecting the output terminal of the detection unit 500 to the main control chip of the device where the compressor works, the detection unit 500 can send the working state of the compressor to the main control chip of the device where the compressor works in the form of a feedback signal. Since the state of the compressor is controlled by the main control chip, the main control chip is clear about the current standard state of the compressor.

[0061] Therefore, after receiving the feedback signal sent by the detection unit 500, the main control chip can compare the feedback signal with the current standard state of the compressor to determine whether the compressor can work normally. And if the compressor is not faulty, the reason why the compressor cannot work normally lies in the first switch circuit 100, the second switch circuit 200 and the third switch circuit 300. Therefore, based on the above feedback signal, it can also be determined whether the first switch circuit 100, the second switch circuit 200 and the third switch circuit 300 can work normally. In this way, the detection of the working conditions of the compressor, the first switch circuit 100, the second switch circuit 200 and the third switch circuit 300 is realized.

[0062] Optionally, the detection unit 500 includes an optocoupler 510 and a pull-up resistor 520. The first input end of the optocoupler 510 is connected to the first end of the compressor, the second input end of the optocoupler 510 is connected to the neutral line, the first output end of the optocoupler 510 is connected to the main control chip of the device where the compressor works, and the second output end of the optocoupler 510 is connected to the ground line. The first end of the pull-up resistor 520 is connected to the second control power supply, and the second end of the pull-up resistor 520 is connected to the first output end of the optocoupler 510.

[0063] Specifically, the second control power supply is a 5V power supply.

[0064] Specifically, by connecting the optocoupler 510 and the pull-up resistor 520 in the above manner, when the two ends of the compressor are at a positive voltage and the two input ends of the optocoupler 510 meet the optocoupler 510 turn-on voltage, the optocoupler 510 can pull the output signal of the output end to a low level. When the two ends of the compressor are at a positive voltage and the two input ends do not meet the optocoupler 510 turn-on voltage, or when the two ends of the compressor are at a negative voltage, the output of the optocoupler 510 is disconnected, and the signal of the pull-up resistor 520 is pulled high by the second control power supply, so that the output signal of the output end of the optocoupler 510 is at a high level.

[0065] Therefore, when the compressor is operating normally, the optical coupler 510 can input a square wave feedback signal to the main control chip, thereby realizing the detection of the operating state of the compressor.

[0066] like Figure 5As shown, in some embodiments, the detection unit 500 also includes a current limiting resistor 530, a second diode 540, a fourth resistor 550 and a second capacitor 560. The first end of the current limiting resistor 530 is connected to the first end of the compressor, and the second end of the current limiting resistor 530 is connected to the first input end of the optocoupler 510. The first end of the second diode 540 is connected to the neutral line, and the second end of the second diode 540 is connected to the first input end of the optocoupler 510. The first end of the fourth resistor 550 is connected to the second end of the pull-up resistor 520, and the second end of the fourth resistor 550 is connected to the main control chip of the device where the compressor works. The first end of the second capacitor 560 is connected to the second end of the fourth resistor 550, and the second end of the second capacitor 560 is connected to the ground line.

[0067] Specifically, by providing a current limiting resistor 530 between the first end of the compressor and the first input end of the optocoupler 510 , the current flowing into the optocoupler 510 can be limited to prevent the optocoupler 510 from being burned due to excessive current.

[0068] Specifically, a second diode 540 is provided between the first input terminal of the optocoupler 510 and the neutral line, and the positive terminal (i.e., the first terminal) of the second diode 540 is connected to the neutral line, and the negative terminal (i.e., the second terminal) of the second diode 540 is connected to the first input terminal of the optocoupler 510. When the phase voltage of the live line is in the negative half axis, the reverse voltage of the diode at the input of the optocoupler 510 is clamped at a lower voltage to prevent the voltage from being too large and burning the optocoupler 510.

[0069] Specifically, by providing the fourth resistor 550 and the second capacitor 560 , a resistance-capacitance filter can be formed on the feedback signal output by the optical coupler 510 , thereby removing noise in the feedback signal and ensuring the accuracy of the feedback signal.

[0070] Combination Figure 6 As shown, the storage device 600 provided in the embodiment of the present disclosure includes a device body 610 and a compressor 620. The compressor 620 is arranged on the device body 610, and the first end of the compressor 620 is connected to the live wire through the control circuit 10 for the compressor as described above, and the second end of the compressor 620 is connected to the neutral wire.

[0071] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them.Other embodiments may include structural, logical, electrical, process, and other changes.

[0072] The embodiments are representative of possible variations only. Individual components and functions are optional unless explicitly required, and the order of operations may vary.

[0073] The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates, the singular "a" (a), "an" (an) and "the" (the) are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings that include one or more associated ones.

[0074] In addition, when used in this application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or groups thereof. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the presence of other identical elements in the process, method or device that includes the elements.

[0075] In this article, each embodiment may focus on the differences from other embodiments, and the same or similar parts between the embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts may refer to the description of the method part.

[0076] The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A control circuit for a compressor, characterized in that: The first end of the compressor is connected to the live wire through the control circuit, and the second end of the compressor is connected to the neutral wire; the control circuit includes: A first switch circuit, an input end of which is connected to the live wire; a second switch circuit, an input end of which is connected to the output end of the first switch circuit, and an output end of which is connected to the first end of the compressor; a third switch circuit, an input end of which is connected to the output end of the first switch circuit, and an output end of which is connected to the first end of the compressor; Among them, the first switch circuit is in a normally on state, and the second switch circuit and the third switch circuit alternately control the start and stop of the compressor; when there is a pull-in failure in the second switch circuit or the third switch circuit, the start and stop of the compressor are controlled by the normal switch circuit; when there is a disconnection failure in the second switch circuit or the third switch circuit, the normal switch circuit is controlled to be pulled in, and the start and stop of the compressor are controlled by the first switch circuit.

2. The control circuit according to claim 1, characterized in that: The first switch circuit, the second switch circuit and the third switch circuit each include a relay and a control unit; The relay includes a switch element and a control coil, wherein the first end of the switch element is the input end of the switch circuit, and the second end of the switch element is the output end of the switch circuit; the first end of the control coil is connected to the first control power supply, and the second end of the control coil is connected to the output end of the control unit; The input end of the control unit is connected to the main control chip of the equipment on which the compressor works.

3. The control circuit according to claim 2, characterized in that: The control unit includes: A triode, wherein the collector of the triode is connected to the second end of the control coil, and the emitter of the triode is connected to the ground wire; a first resistor, wherein a first end of the first resistor is connected to the base of the transistor, and a second end of the first resistor serves as an input end of the control unit; A second resistor, wherein a first end of the second resistor is connected to the emitter of the transistor, and a second end of the second resistor is connected to the base of the transistor.

4. The control circuit according to claim 3, characterized in that: The control unit also includes: A first diode, wherein a first end of the first diode is connected to the second end of the control coil, and a second end of the first diode is connected to the first end of the control coil.

5. The control circuit according to any one of claims 1 to 4, characterized in that: The control circuit also includes: A protection unit, one end of the protection unit is connected to the live wire, and the other end of the protection unit is connected to the output end of the second switch circuit or the third switch circuit; The protection unit is used to absorb the high pressure generated when the compressor is disconnected.

6. The control circuit according to claim 5, characterized in that: The protection unit includes: A first capacitor, a first end of the first capacitor is connected to the live wire; A third resistor, wherein a first end of the third resistor is connected to the second end of the first capacitor, and a second end of the third resistor is connected to an output end of the second switch circuit or the third switch circuit.

7. The control circuit according to any one of claims 1 to 4, characterized in that: The control circuit also includes: A detection unit, wherein a first input end of the detection unit is connected to a first end of the compressor, a second input end of the detection unit is connected to a neutral line, and an output end of the detection unit is connected to a main control chip of a device on which the compressor works; The detection unit is used to detect the working state of the compressor and generate a feedback signal to output to the main control chip of the device where the compressor works.

8. The control circuit according to claim 7, characterized in that: The detection unit includes: An optical coupler, wherein a first input end of the optical coupler is connected to a first end of the compressor, a second input end of the optical coupler is connected to a neutral line, a first output end of the optical coupler is connected to a main control chip of a device on which the compressor works, and a second output end of the optical coupler is connected to a ground line; A pull-up resistor, wherein a first end of the pull-up resistor is connected to the second control power supply, and a second end of the pull-up resistor is connected to the first output end of the optical coupler.

9. The control circuit according to claim 8, characterized in that: The detection unit also includes: A current limiting resistor, wherein a first end of the current limiting resistor is connected to a first end of the compressor, and a second end of the current limiting resistor is connected to a first input end of the optical coupler; A second diode, wherein a first end of the second diode is connected to the neutral line, and a second end of the second diode is connected to the first input end of the optical coupler; a fourth resistor, wherein a first end of the fourth resistor is connected to a second end of the pull-up resistor, and a second end of the fourth resistor is connected to a main control chip of a device where the compressor works; A second capacitor, wherein a first end of the second capacitor is connected to a second end of the fourth resistor, and a second end of the second capacitor is connected to a ground line.

10. A storage device, characterized in that: include: Equipment body; The compressor is arranged on the equipment body, the first end of the compressor is connected to the live wire through the control circuit for the compressor as claimed in any one of claims 1 to 9, and the second end of the compressor is connected to the neutral wire.

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