Low-power-consumption standby circuit of refrigeration equipment and refrigerator thereof

Abstract

The utility model discloses a low-power-consumption standby circuit of refrigeration equipment and a refrigerator thereof, the output end of a non-isolated power supply circuit is converted through a BUCK power supply chip to provide working voltage for a rear-end load of the refrigeration equipment, and is also connected to the power taking end of a control chip through a voltage conversion circuit, and the control chip is connected with the power taking end of the control chip in a standby mode. When the control chip is in a standby mode, a switch tube of the power supply control circuit is driven to be switched off through the power supply enabling end, a BUCK power supply chip stops working, a rear-end load is completely powered off, when the control chip quits the standby mode, the switch tube of the power supply control circuit is driven to be switched on through the power supply enabling end, the BUCK power supply chip starts working, and then power supply of the rear-end load is recovered. According to the embodiment of the invention, the BUCK power supply chip is in butt joint with the non-isolated power supply circuit and the rear-end load, and the control chip is used for controlling whether the BUCK power supply chip works or not to realize entering or exiting of the standby mode, so that complete cutting-off of power supply of the rear-end load is realized, and low-power-consumption standby can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a low-power standby circuit of a refrigeration device and a refrigerator thereof. Background Art

[0002] At present, small-volume variable-frequency refrigerator products can use a single-chip control solution to implement refrigerator control logic and control the operation of the variable-frequency compressor because of their small functional load. This single-chip control solution generally adopts a BUCK power supply solution, using a non-isolated power supply to output 15V as the main power supply for the entire control module. The power supply for the back-end load and the module is obtained by converting the output of the non-isolated power supply.

[0003] However, this single-chip control solution uses a single power supply output, and the control chip and the back-end load use the same power supply, so the standby power consumption is relatively high. The control chip cannot completely enter the sleep mode, and the standby power consumption remains at a high level. Utility Model Content

[0004] The embodiment of the present application provides a low-power standby circuit for a refrigeration device and a refrigerator thereof, which can completely cut off the rear-end load and reduce the standby power consumption.

[0005] In a first aspect, an embodiment of the present application provides a low power consumption standby circuit for a refrigeration device, comprising:

[0006] A non-isolated power supply circuit, wherein an input end of the non-isolated power supply circuit is connected to an AC voltage source, and an output end of the non-isolated power supply circuit is used to output a converted DC voltage;

[0007] A BUCK power chip, wherein the input end of the BUCK power chip is connected to the output end of the non-isolated power circuit, and the output end of the BUCK power chip is coupled to the rear end load of the refrigeration equipment;

[0008] The power supply control circuit comprises a switch tube, wherein a first switch pin of the switch tube is connected to an enable terminal of the BUCK power chip, and a second switch pin of the switch tube is grounded;

[0009] The control circuit includes a voltage conversion circuit and a control chip, wherein the control chip includes a power supply terminal and a power enable terminal, the input terminal of the voltage conversion circuit is connected to the output terminal of the non-isolated power supply circuit, the output terminal of the voltage conversion circuit is connected to the power supply terminal, and the power enable terminal is connected to the control pin of the switch tube to drive the switch tube to be turned on and off by outputting a level signal.

[0010] In some embodiments, the voltage conversion circuit includes a voltage divider circuit and a DC-DC conversion module, one end of the voltage divider circuit is connected to the output end of the non-isolated power supply circuit, the other end of the voltage divider circuit is connected to the input end of the DC-DC conversion module, and the output end of the DC-DC conversion module is connected to the power supply end.

[0011] In some embodiments, the low-power standby circuit also includes a filtering circuit, which includes a first inductor component and a first capacitor component, one end of the first inductor component is connected to the output end of the BUCK power chip, and the other end of the first inductor component is grounded through the first capacitor component. The connection point between the first inductor component and the first capacitor component serves as a back-end power supply port, which is coupled to the back-end load to provide an operating voltage.

[0012] In some embodiments, the BUCK power chip further includes a voltage feedback terminal, and the voltage feedback terminal is coupled to the back-end power supply port through a diode.

[0013] In some embodiments, the back-end load includes a main control module and a workload, the main control module and the workload are connected to the back-end power supply port, and the main control module is communicatively connected to the control chip.

[0014] In some embodiments, the control chip further includes a door switch signal receiving end, and the door switch signal receiving end is coupled to a door switch detection module of the refrigeration equipment.

[0015] In some embodiments, the control chip further includes a temperature signal receiving end, and the temperature signal receiving end is coupled to a compartment temperature sensor of the refrigeration device.

[0016] In some embodiments, the non-isolated power supply circuit includes a rectifier module and a common-mode inductor, the two input ends of the rectifier module are connected to the AC voltage source through the common-mode inductor, and the two output ends of the rectifier module are connected to the BUCK power chip.

[0017] In some embodiments, the power supply control circuit further includes a first resistor and a second resistor, the power enable terminal is connected to the control pin of the switch tube through the first resistor, and the second switch pin of the switch tube is grounded through the second resistor.

[0018] In a second aspect, an embodiment of the present application provides a refrigerator, comprising the low-power standby circuit of the embodiment of the first aspect.

[0019] The low-power standby circuit of the refrigeration equipment and the refrigerator thereof of the embodiment of the present application have at least the following beneficial effects: the non-isolated power supply circuit converts AC power into DC power output, and the output end of the non-isolated power supply circuit is not only converted by the BUCK power supply chip to provide a working voltage to the rear-end load of the refrigeration equipment, but also connected to the power-taking end of the control chip through the voltage conversion circuit. In the standby mode, the control chip drives the switch tube of the power supply control circuit to turn off through the power enable end, and the BUCK power supply chip stops working, so that the rear-end load is completely powered off, and the standby power consumption of the rear-end load can be cut off. When the control chip exits the standby mode, the switch tube of the power supply control circuit is driven to turn on through the power enable end, and the BUCK power supply chip starts working, thereby restoring the power supply to the rear-end load. The embodiment of the present application uses the BUCK power supply chip to connect the non-isolated power supply circuit and the rear-end load, and uses the control chip to control whether the BUCK power supply chip works to realize the entry or exit of the standby mode, and realizes the complete cutting off of the power supply to the rear-end load, so that low-power standby can be achieved.

[0020] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a circuit module connection diagram of the current single-chip control solution for small-volume refrigerators;

[0022] Figure 2 is a circuit diagram of a low-power standby circuit provided by an embodiment of the present application;

[0023] Figure 3 is a circuit diagram of a control module provided by an embodiment of the present application;

[0024] Figure 4 This is a circuit diagram of another control module provided by an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the characteristics, operations or features described in the specification can be combined in any appropriate manner to form various implementation methods. At the same time, the steps or actions in the method description can also be replaced or adjusted in order in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the accompanying drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0026] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0028] For small-volume inverter refrigerator products, due to the small functional load, a single-chip control solution is used to replace the original dual-chip control solution, that is, the refrigerator control logic and the inverter compressor control logic are implemented by one chip. Figure 1The figure shows the module connection diagram of the single-chip control solution. Generally, a BUCK non-isolated power supply solution is adopted, in which the non-isolated power supply outputs a 15V DC voltage as the main power supply of the entire control module. The power supply voltage of the rear-end load and other circuit modules is converted from this 15V DC power supply. Specifically, the AC voltage source is converted through a rectifier and filter circuit to obtain a DC voltage on the DC bus. The DC voltage is relatively high, so it is converted into a 15V DC voltage through a high-voltage power conversion circuit. Then the 15V DC voltage is converted into a voltage suitable for the operation of the control chip through a low-voltage conversion circuit. The 15V DC voltage is also supplied to the inverter drive chip, which controls the operation of the variable frequency compressor. The control chip is also connected to peripheral loads such as the temperature acquisition circuit, the door switch signal acquisition circuit, the lighting circuit, and the display module. Therefore, in the main control frequency conversion integrated control solution implemented on a single chip, due to the use of single power output and single chip control, and the control chip and the load use the same power supply, the control chip is responsible for many peripheral circuits, so it is difficult for the control chip to enter the standby mode. Even if it enters the standby mode, it needs to take into account the needs of multiple peripheral circuits and cannot enter a complete sleep mode. As a result, the standby power consumption of small-volume frequency conversion refrigerators is high, which does not meet the power saving needs of small-volume refrigerators.

[0029] Based on this, the embodiment of the present application provides a low-power standby circuit of a refrigeration device and a refrigerator thereof. The non-isolated power supply circuit converts AC power into DC power output. The output end of the non-isolated power supply circuit is not only converted by a BUCK power supply chip to provide a working voltage to the rear-end load of the refrigeration device, but is also connected to the power supply end of the control chip through a voltage conversion circuit. In the standby mode, the control chip drives the switch tube of the power supply control circuit to turn off through the power enable end, and the BUCK power supply chip stops working, so that the rear-end load is completely powered off, and the standby power consumption of the rear-end load can be cut off. When the control chip exits the standby mode, the switch tube of the power supply control circuit is driven to turn on through the power enable end, and the BUCK power supply chip starts working, thereby restoring the power supply to the rear-end load. The embodiment of the present application uses the BUCK power supply chip to connect the non-isolated power supply circuit and the rear-end load, and uses the control chip to control whether the BUCK power supply chip is working to realize the entry or exit of the standby mode, and realizes the complete cutting off of the power supply to the rear-end load, so that low-power standby can be achieved.

[0030] The low power consumption standby circuit of the refrigeration equipment and the refrigerator thereof are described below with reference to the accompanying drawings.

[0031] Reference Figure 2 As shown, Figure 2 is a circuit diagram of a low-power standby circuit provided in an embodiment of the present application, and the low-power standby circuit includes:

[0032] A non-isolated power supply circuit, wherein the input end of the non-isolated power supply circuit is connected to an AC voltage source, and the output end of the non-isolated power supply circuit is used to output a converted DC voltage;

[0033] BUCK power chip IC1, the input end of the BUCK power chip IC1 is connected to the output end of the non-isolated power circuit, and the output end of the BUCK power chip IC1 is coupled to the rear end load of the refrigeration equipment;

[0034] The power supply control circuit includes a switch tube Q1, a first switch pin of the switch tube Q1 is connected to an enable terminal ZC of a BUCK power chip IC1, and a second switch pin of the switch tube Q1 is grounded;

[0035] The control circuit includes a voltage conversion circuit and a control chip. The control chip includes a power supply terminal and a power enable terminal. The input terminal of the voltage conversion circuit is connected to the output terminal of the non-isolated power supply circuit, the output terminal of the voltage conversion circuit is connected to the power supply terminal, and the power enable terminal is connected to the control pin of the switch tube Q1 to drive the switch tube Q1 to be turned on and off by an output level signal.

[0036] The AC voltage source is converted into a 15V DC voltage through a non-isolated power supply circuit. The non-isolated power supply includes an AC power terminal, a common-mode inductor L1, and a rectifier circuit. The AC power terminal is connected to an AC voltage source ( Figure 2 The two windings of the common mode inductor L1 are connected to the live wire L and the neutral wire N respectively, and are input to the rectifier circuit after EMC filtering by the capacitor. The output end of the rectifier circuit is connected to the input end of the BUCK power chip IC1 (i.e. Figure 2 The output end of the BUCK power chip IC1 is used to output a 15V DC voltage. It can be seen that the BUCK power chip IC1 is equivalent to a DC step-down module, which converts the DC power output by the rectifier circuit into 15V as the main power supply for the main control module and / or the rear-end load.

[0037] The two switch pins of the switch tube Q1 of the power supply control circuit are respectively connected to the enable terminal ZC of the BUCK power chip IC1 and the ground terminal of the circuit. Therefore, when the switch tube Q1 is turned off, the enable terminal ZC of the BUCK power chip IC1 is at a high level, the BUCK power chip IC1 is in working state, and the voltage of the non-isolated power supply circuit is converted and output to 15V voltage through the BUCK power chip IC1 to supply power to the main control module and / or the rear-end load. When the switch tube Q1 is turned on, the enable terminal ZC of the BUCK power chip IC1 is pulled down to the ground, and the BUCK power chip IC1 turns off the output, cutting off the power supply to the main control module and / or the rear-end load. The control terminal of the switch tube Q1 is connected to the power enable terminal of the control chip. The control chip can turn on the switch tube Q1 by outputting a high-level signal through the power enable terminal, and can turn off the switch tube Q1 by outputting a low-level signal. In addition, a DC voltage is drawn from the output end of the non-isolated power supply circuit, and after conversion by the voltage conversion circuit, a voltage suitable for the operation of the control chip is obtained. Regardless of whether in standby or normal working conditions, the control chip directly draws power from the output end of the rectifier module, so it can control the on and off of the switch tube Q1 at any time to realize power supply control of the main control module and / or the rear-end load, thereby realizing low-power standby of the refrigeration equipment.

[0038] It is understandable that the BUCK power chip used in the embodiment of the present application can be replaced by a BUCK circuit module. The main function is to reduce the higher input voltage to the required output voltage. This is achieved by controlling the on and off of internal switches (usually MOSFETs), which operate at high frequencies to quickly switch between the input voltage and ground, while also maintaining the stability of the output voltage through internal feedback circuits and regulation mechanisms. When the output voltage deviates from the set value due to load changes or other factors, the chip adjusts the on and off times of the switch to maintain the stability of the output voltage.

[0039] In some embodiments, the voltage conversion circuit includes a voltage divider circuit and a DC-DC conversion module, one end of the voltage divider circuit is connected to the output end of the non-isolated power supply circuit, the other end of the voltage divider circuit is connected to the input end of the DC-DC conversion module, and the output end of the DC-DC conversion module is connected to the power supply end.

[0040] The output voltage of the non-isolated power supply circuit is stepped down by a voltage divider circuit and a DC-DC conversion module to obtain a working voltage suitable for the control chip. The voltage divider circuit is composed of multiple resistors connected in series and in parallel, so that the voltage divider output point outputs a voltage suitable for the input voltage range of the DC-DC conversion module, and the DC-DC conversion module then converts the voltage into a working voltage suitable for the control chip. Specifically, refer to Figure 3As shown, the voltage divider circuit includes three resistors connected in series, namely resistor R4, resistor R5 and resistor R3. Resistor R3 is coupled to the input end of the DC-DC conversion module. The DC-DC conversion module is composed of a power conversion chip and a peripheral circuit. The peripheral circuit includes a voltage stabilizing diode D4, a capacitor C4 and a capacitor C3, which are used to stabilize the voltage and reduce voltage fluctuations. The input end of the power conversion chip is connected to resistor R3, and the output end of the power conversion chip is connected to the VCC pin of the control chip. Based on the size of the AC input voltage, or based on the size of the output voltage of the non-isolated power supply circuit, a resistor with a suitable resistance value is selected for the voltage divider circuit and a power conversion chip of a suitable model is selected, so that the VCC voltage of the control chip can be obtained.

[0041] It can be understood that, in the above embodiment, both the voltage divider circuit and the DC-DC conversion module are used to reduce the voltage. In practical applications, only the DC-DC conversion module can be used to reduce the voltage. Figure 4 As shown, the voltage output by the BUCK power chip IC1 is directly converted into a working voltage suitable for the control chip.

[0042] In some embodiments, the low-power standby circuit also includes a filtering circuit, which includes a first inductor component and a first capacitor component, one end of the first inductor component is connected to the output end of the BUCK power chip IC1, and the other end of the first inductor component is grounded through the first capacitor component. The connection point between the first inductor component and the first capacitor component serves as a back-end power supply port, which is coupled to the back-end load to provide an operating voltage.

[0043] The first inductor component is Figure 2 Inductor L2 is inductor L2, and the first capacitor component is in Figure 2 The inductor L2 includes capacitor EC2 and capacitor C2. One end of the inductor L2 is connected to the output end of the BUCK power chip IC1, and the other end is connected to the capacitor EC2 and the capacitor C2, and the connection point is used as the back-end power supply port. The capacitor EC2 and the capacitor C2 are connected to the ground in parallel to achieve voltage filtering.

[0044] In some embodiments, the BUCK power chip IC1 further includes a voltage feedback terminal FB, which is coupled to the back-end power supply port through a diode. The voltage feedback terminal of the BUCK power chip IC1 is connected to the cathode of the diode D1, and the anode of the diode D1 is connected to the back-end power supply port, that is, connected to the connection point of the inductor L2 and the capacitor EC2. The BUCK power chip IC1 can automatically adjust the output voltage according to the voltage of the voltage feedback terminal FB.

[0045] In some embodiments, the back-end load includes a main control module and a workload, the main control module and the workload are connected to the back-end power supply port, and the main control module is connected to the control chip. The back-end load of this embodiment uses a main control chip to control the workload. The main control chip and the workload are powered from the output end of the BUCK power chip IC1, and the main control chip can also output control instructions to the workload. Therefore, the low-power standby circuit of this embodiment adopts a dual-chip solution, that is, a low-power chip (i.e., the control chip of the control circuit) is used to maintain a low-power state and turn off the power supply of the main control module. In the standby state, only the control chip maintains a low-power mode, and the main control module and the workload are in a power-off state to achieve low-power standby. Under normal working conditions, the control chip wakes up the main control module, and the main control module controls the workload to work normally.

[0046] Reference Figure 3 or Figure 4 As shown, in some embodiments, the control chip further includes a door switch signal receiving terminal, and the door switch signal receiving terminal is coupled to the door switch detection module of the refrigeration equipment. The control chip can also be triggered by the door switch detection module. When the user opens the door of the refrigeration equipment, it is detected by the door switch detection module, and the door switch detection module generates a signal to transmit to the control chip, and the control chip wakes up and exits the low power consumption mode. If the compartment corresponding to the door switch detection module is a compartment such as a cold storage room that automatically turns on the lighting, the switch tube Q1 is driven to turn on through the power enable terminal, thereby waking up the main control module, so that the main control module turns on the lighting of the corresponding compartment.

[0047] Reference Figure 3 or Figure 4 As shown, in some embodiments, the control chip also includes a temperature signal receiving end, and the temperature signal receiving end is coupled to a compartment temperature sensor of the refrigeration device. The control chip is connected to the compartment temperature sensor to receive the collected compartment temperature. The control chip is used to compare the compartment temperature with the start-up temperature of the compressor after being periodically triggered by the internal clock or triggered by the door switch signal. If it is higher than the start-up temperature of the compressor, it means that refrigeration is required. At this time, the power enable end drives the switch tube Q1 to make the BUCK power chip IC1 work, and the main control module can control the compressor to work after being powered on.

[0048] In some embodiments, the power supply control circuit further includes a first resistor R1 and a second resistor R2, the power enable terminal is connected to the control pin of the switch tube Q1 through the first resistor R1, and the second switch pin of the switch tube Q1 is grounded through the second resistor R2. That is, the control terminal of the switch tube Q1 is respectively connected to one end of the first resistor R1 and one end of the second resistor R2, the other end of the first resistor R1 is connected to the power enable terminal, and the other end of the second resistor R2 is connected to the second switch pin of the switch tube Q1.

[0049] Based on the cooperation between the control chip and the main control module, when the refrigeration equipment is in standby mode, the control chip is in low power consumption mode, the power enable end of the control chip is in a state of applying a high level to the control pin of the switch tube Q1, the switch tube Q1 is in the on state, the enable end ZC of the BUCK power chip IC1 is pulled down to ground, thereby turning off the output of the BUCK power chip IC1, and the main control module and the workload are in a power-off state. At this time, the standby power consumption of the refrigeration equipment is very low. In low power consumption mode, the control chip wakes up at a certain period of time, or is triggered to wake up by the door switch signal when the user opens the door body. The awakened control chip exits the low power consumption mode, checks whether the temperature value collected by the sensor (corresponding to different compartments) is higher than the start-up temperature of the compressor, or detects whether the compartment corresponding to the door switch signal needs to turn on the lighting. If so, the power enable end outputs a low level to the switch tube Q1Q1, the switch tube Q1Q1 is turned off, and the 15V output by the BUCK power chip IC1 is connected to the main control module, the main control module is awakened, and the compressor is controlled to work for refrigeration or the internal lighting module is controlled to work.

[0050] In summary, the non-isolated power supply circuit converts AC power into DC power output. The output end of the non-isolated power supply circuit is not only converted by the BUCK power supply chip IC1 to provide a working voltage to the rear-end load of the refrigeration equipment, but is also connected to the power supply end of the control chip through the voltage conversion circuit. In the standby mode, the control chip drives the switch tube Q1 of the power supply control circuit to turn off through the power enable end, and the BUCK power supply chip IC1 stops working, so that the rear-end load is completely powered off, and the standby power consumption of the rear-end load can be cut off. When the control chip exits the standby mode, the switch tube Q1 of the power supply control circuit is driven to turn on through the power enable end, and the BUCK power supply chip IC1 starts working, thereby restoring the power supply to the rear-end load. The embodiment of the present application uses the BUCK power supply chip IC1 to connect the non-isolated power supply circuit and the rear-end load, and uses the control chip to control whether the BUCK power supply chip IC1 is working to realize the entry or exit of the standby mode, so as to realize the complete cutting off of the power supply to the rear-end load, thereby realizing low-power standby.

[0051] An embodiment of the present application also provides a refrigerator, comprising the low-power standby circuit of any of the aforementioned embodiments.

[0052] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0053] In several embodiments provided in the present application, it should be understood that the disclosed systems, apparatuses and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of apparatuses or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0054] It should also be understood that the various implementations provided in the embodiments of the present application can be combined arbitrarily to achieve different technical effects.

[0055] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A low power standby circuit for refrigeration equipment, characterized in that: include: A non-isolated power supply circuit, wherein an input end of the non-isolated power supply circuit is connected to an AC voltage source, and an output end of the non-isolated power supply circuit is used to output a converted DC voltage; A BUCK power chip, wherein the input end of the BUCK power chip is connected to the output end of the non-isolated power circuit, and the output end of the BUCK power chip is coupled to the rear end load of the refrigeration equipment; The power supply control circuit comprises a switch tube, wherein a first switch pin of the switch tube is connected to an enable terminal of the BUCK power chip, and a second switch pin of the switch tube is grounded; The control circuit includes a voltage conversion circuit and a control chip, wherein the control chip includes a power supply terminal and a power enable terminal, the input terminal of the voltage conversion circuit is connected to the output terminal of the non-isolated power supply circuit, the output terminal of the voltage conversion circuit is connected to the power supply terminal, and the power enable terminal is connected to the control pin of the switch tube to drive the switch tube to be turned on and off by outputting a level signal.

2. The low power standby circuit according to claim 1, characterized in that: The voltage conversion circuit includes a voltage divider circuit and a DC-DC conversion module, one end of the voltage divider circuit is connected to the output end of the non-isolated power supply circuit, the other end of the voltage divider circuit is connected to the input end of the DC-DC conversion module, and the output end of the DC-DC conversion module is connected to the power supply end.

3. The low power standby circuit according to claim 1, characterized in that: The low-power standby circuit also includes a filtering circuit, which includes a first inductor component and a first capacitor component, one end of the first inductor component is connected to the output end of the BUCK power chip, and the other end of the first inductor component is grounded through the first capacitor component. The connection point between the first inductor component and the first capacitor component serves as a back-end power supply port, which is coupled to the back-end load to provide an operating voltage.

4. The low power standby circuit according to claim 3, characterized in that: The BUCK power chip also includes a voltage feedback terminal, and the voltage feedback terminal is coupled to the back-end power supply port through a diode.

5. The low power standby circuit according to claim 3, characterized in that: The back-end load includes a main control module and a workload. The main control module and the workload are connected to the back-end power supply port. The main control module is communicatively connected to the control chip.

6. The low power standby circuit according to claim 1, characterized in that: The control chip further comprises a door switch signal receiving terminal, and the door switch signal receiving terminal is coupled to a door switch detection module of the refrigeration equipment.

7. The low power standby circuit according to claim 1, characterized in that: The control chip further comprises a temperature signal receiving end, and the temperature signal receiving end is coupled to a compartment temperature sensor of the refrigeration device.

8. The low power standby circuit according to claim 1, characterized in that: The non-isolated power supply circuit includes a rectifier module and a common-mode inductor. Two input ends of the rectifier module are connected to the AC voltage source through the common-mode inductor, and two output ends of the rectifier module are connected to the BUCK power chip.

9. The low power standby circuit according to claim 1, characterized in that: The power supply control circuit further includes a first resistor and a second resistor. The power enable terminal is connected to the control pin of the switch tube through the first resistor, and the second switch pin of the switch tube is grounded through the second resistor.

10. A refrigerator, comprising the low-power standby circuit according to any one of claims 1 to 9.

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