Circuit for reducing power consumption of frequency conversion refrigerator

Abstract

The utility model mainly relates to the technical field of frequency conversion refrigerator control. The utility model provides a circuit for reducing power consumption of an inverter refrigerator. The circuit comprises a compressor control module, a power supply control module and a refrigerator main control module, the compressor control module is used for driving a compressor to operate, the power supply control module comprises an alternating current input interface, a first power management circuit and a second power management circuit, and the alternating current input interface is connected with the compressor control module through a first electricity conversion circuit. The alternating current input interface is connected with the refrigerator main control module through the second power supply management circuit, the enable signal output end of the refrigerator main control module is connected with the first power supply signal conversion circuit, and when the compressor is closed, the refrigerator main control module closes a power supply signal of the compressor control module by controlling the first power supply management circuit; and closing the compressor control module to reduce the power consumption of the refrigerator.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of variable frequency refrigerator control, in particular to a circuit for reducing the power consumption of a variable frequency refrigerator. Background Art

[0002] Currently, the first-level energy-efficient refrigerators on the market are basically inverter refrigerators, but the standby power consumption and operating power consumption of their inverter control systems are still relatively high. If they are not upgraded in technology, many will face the problem of energy efficiency "downgrade" under the new energy efficiency standards.

[0003] The high power consumption of inverter refrigerators is primarily due to two factors: 1. Standby power consumption. 2. Operating power consumption. High standby power consumption is caused by the fact that the refrigerator's compressor often remains idle and in standby mode, while the inverter control board's microcontroller, driver chips, and other components remain powered and consume energy. The solution is to disconnect the power supply to the inverter control unit when the compressor is not needed. High operating power consumption is caused by the fact that when driving the inverter compressor, the inverter board's circuit components, such as the diodes in the full-bridge rectifier, filter capacitors, and switching devices in the inverter circuit, generate significant conduction and switching losses, impacting energy efficiency. Operating power consumption can be reduced by selecting diodes with low on-voltage, capacitors with low equivalent series resistance, and switching devices with low on-resistance and fast switching speeds. Utility Model Content

[0004] Technical problems to be solved by the utility model

[0005] A circuit for reducing power consumption of a frequency conversion refrigerator is provided, aiming to reduce the standby power consumption of the frequency conversion refrigerator.

[0006] The technical solution adopted by the utility model to solve the above technical problems

[0007] A circuit for reducing the power consumption of a variable-frequency refrigerator includes a compressor control module, a power supply control module, and a refrigerator main control module; the compressor control module is used to drive the compressor to operate, and the power supply control module includes an AC input interface, a first power management circuit, and a second power management circuit. The AC input interface is connected to the compressor control module through the first power conversion circuit, and the AC input interface is connected to the refrigerator main control module through the second power management circuit. The enable signal output end of the refrigerator main control module is connected to the first power management circuit for controlling the on / off of the electrical signal between the first power management circuit and the compressor control module.

[0008] Furthermore, it also includes a load control circuit, the AC input interface is connected to the power input end of the load control circuit through the second power management circuit, the power output end of the load control circuit is connected to the power input end of the load other than the compressor in the refrigerator, and the enable signal output end of the refrigerator main control module is connected to the load control circuit, which is used to control the on and off of the electrical signal between the load control circuit and the load other than the compressor in the refrigerator.

[0009] Furthermore, the first power management circuit includes a first full-bridge rectifier circuit, a first capacitor filter circuit, a first switching power supply, a first rectifier circuit, a second rectifier circuit, a power conversion circuit, and a first DC-DC step-down circuit. The AC input interface is connected to the first full-bridge rectifier circuit, the first full-bridge rectifier circuit is connected to the first capacitor filter circuit, the first capacitor filter circuit is connected to the first switching power supply, the first switching power supply circuit is connected to the first rectifier circuit and the second rectifier circuit respectively, the first rectifier circuit is connected to the power conversion circuit, and the second rectifier circuit is connected to the first DC-DC step-down circuit.

[0010] The compressor control module includes a single-chip microcomputer, a drive chip and an inverter circuit. The single-chip microcomputer is connected to the drive chip, the drive chip is connected to the inverter circuit, and the inverter circuit is connected to the compressor; the first capacitor filter circuit is connected to the inverter circuit, the power conversion circuit is connected to the drive chip, and the first DC-DC step-down circuit is connected to the single-chip microcomputer.

[0011] Furthermore, the second power management circuit includes a second full-bridge rectifier circuit, a second capacitor filter circuit, a second switching power supply, a third rectifier circuit, and a second DC-DC step-down circuit. The AC input interface is connected to the second full-bridge rectifier circuit, the second full-bridge rectifier circuit is connected to the second capacitor filter circuit, the second capacitor filter circuit is connected to the second switching power supply, the second switching power supply is connected to the third rectifier circuit, the third rectifier circuit is connected to the second DC-DC step-down circuit and the load control circuit, and the DC-DC step-down circuit is connected to the refrigerator main control module.

[0012] Furthermore, the first full-bridge rectifier circuit and the second full-bridge rectifier circuit are the same full-bridge rectifier circuit, the first capacitor filter circuit and the second capacitor filter circuit are the same capacitor filter circuit, and the first switching power supply and the second switching power supply are the same switching power supply.

[0013] Furthermore, the power conversion circuit is a DC-DC step-down circuit or a linear voltage stabilization circuit.

[0014] Beneficial effects of the utility model

[0015] The utility model provides a circuit for reducing the power consumption of a variable frequency refrigerator, comprising a compressor control module, a power supply control module and a refrigerator main control module; the compressor control module is used to drive the compressor to operate, the power supply control module comprises an AC input interface, a first power management circuit and a second power management circuit, the AC input interface is connected to the compressor control module through the first power conversion circuit, the AC input interface is connected to the refrigerator main control module through the second power management circuit, the enable signal output end of the refrigerator main control module is connected to the first power signal conversion circuit, when the compressor is turned off, the refrigerator main control module turns off the power supply signal of the compressor control module by controlling the first power management circuit, thereby turning off the compressor control module and reducing the power consumption of the refrigerator.

[0016] The circuit for reducing the power consumption of the variable frequency refrigerator described in the present invention is also provided with a second power management circuit and a load control circuit. When other loads other than the compressor in the refrigerator are not working, the refrigerator main control module turns off the power supply of the corresponding load through the load control circuit, which can effectively reduce the standby loss of the refrigerator control system. At the same time, the circuits in the power supply control module and the compressor control module use low-loss devices to further reduce the power consumption of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the circuit structure for reducing power consumption of a variable frequency refrigerator according to Example 1;

[0018] Figure 2 This is a schematic diagram of the circuit structure for reducing the power consumption of a variable frequency refrigerator as described in Example 2. DETAILED DESCRIPTION

[0019] A circuit for reducing the power consumption of a variable-frequency refrigerator includes a compressor control module, a power supply control module and a refrigerator main control module; the compressor control module is used to drive the compressor to operate, and the power supply control module includes an AC input interface, a first power management circuit and a second power management circuit. The AC input interface is connected to the compressor control module through the first power conversion circuit, and the AC input interface is connected to the refrigerator main control module through the second power management circuit. The enable signal output end of the refrigerator main control module is connected to the first power management circuit. When the compressor is turned off, the refrigerator main control module turns off the compressor control module by controlling the first power management circuit to turn off the power supply signal of the compressor control module, thereby reducing the power consumption of the refrigerator.

[0020] The circuit for reducing the power consumption of the variable-frequency refrigerator also includes a load control circuit. The AC input interface is connected to the power input end of the load control circuit through the second power management circuit. The power output end of the load control circuit is connected to the power input end of the remaining loads in the refrigerator except the compressor. The enable signal output end of the refrigerator main control module is connected to the load control circuit. When the loads other than the compressor are turned off, the power supply between the load control circuit and the corresponding load is disconnected.

[0021] Example 1

[0022] The compressor control module includes a single-chip microcomputer, a driver chip, and an inverter circuit. The single-chip microcomputer is connected to the driver chip, and the driver chip is connected to the inverter circuit. The first power management circuit in the power supply control module includes an AC input interface, a first full-bridge rectifier circuit, a first capacitor filter circuit, a first switching power supply, a first rectifier circuit, a second rectifier circuit, a power conversion circuit, a first DC-DC step-down circuit, and a second DC-DC step-down circuit. The AC input interface is connected to the first full-bridge rectifier circuit, the first full-bridge rectifier circuit is connected to the first capacitor filter circuit, the first capacitor filter circuit is connected to the first switch power supply, the first switching power supply circuit is connected to the first rectifier circuit and the second rectifier circuit respectively, the first rectifier circuit is connected to the power conversion circuit, and the second rectifier circuit is connected to the first DC-DC step-down circuit. The power conversion circuit is specifically a linear voltage stabilization circuit.

[0023] The compressor control module includes a single-chip microcomputer, a drive chip and an inverter circuit. The single-chip microcomputer is connected to the drive chip, the drive chip is connected to the inverter circuit, and the inverter circuit is connected to the compressor; the first capacitor filter circuit is connected to the inverter circuit, the power conversion circuit is connected to the drive chip, and the first DC-DC step-down circuit is connected to the single-chip microcomputer.

[0024] The AC power input interface is connected to the refrigerator main control module through the second power management circuit, and the enable signal output end of the refrigerator main control module is respectively connected to the linear voltage stabilization circuit and the first DC-DC conversion circuit in the first power management circuit.

[0025] After AC power is connected to the AC input interface, the first full-bridge rectifier circuit and the first capacitor filter circuit convert the AC voltage into a stable high-voltage DC voltage, which powers the inverter circuit and the first switching power supply. The first power supply outputs two DC voltages, slightly higher than 15V and 3.3V, through the first and second rectifier circuits, respectively, to power the driver chip and microcontroller in the compressor control module. To reduce operating losses, the power conversion circuit and the first DC-DC step-down circuit are used to stabilize the output voltages of the first and second rectifier circuits. When the compressor is not operating, the refrigerator main control module outputs an enable signal from the enable signal output terminal to control the power conversion chip and the first DC-DC step-down circuit to enable control, shutting down the compressor control module driver chip and microcontroller.

[0026] The second power management circuit includes a second full-bridge rectifier circuit, a second capacitor filter circuit, a second switching power supply, a third rectifier circuit, and a second DC-DC step-down circuit. The AC input interface is connected to the second full-bridge rectifier circuit, the second full-bridge rectifier circuit is connected to the second capacitor filter circuit, the second capacitor filter circuit is connected to the second switching power supply, the second switching power supply is connected to the third rectifier circuit, the third rectifier circuit is connected to the second DC-DC step-down circuit and the load control circuit. The power output end of the load control circuit is connected to the power input end of the remaining loads in the refrigerator except the compressor, and the enable signal output end of the refrigerator main control module is connected to the load control circuit. When other loads in the refrigerator are not needed, the refrigerator main control module controls the disconnection of the electrical signal between the load control circuit and the loads in the refrigerator except the compressor.

[0027] The above-mentioned first full-bridge rectifier circuit and the second full-bridge rectifier circuit use diodes with low conduction voltage, and can share the same full-bridge rectifier circuit in the circuit; the first capacitor filter circuit and the second capacitor filter circuit use low equivalent series resistance, and can also be set as the same capacitor filter circuit, and the first switching power supply and the second switching power supply can be set to share the same switching power supply; the third rectifier circuit uses a synchronous rectification scheme, and the inverter circuit uses switching devices with low conduction loss, which can further improve the system operation efficiency and reduce power consumption.

[0028] Example 2

[0029] In this embodiment, the power conversion circuit in embodiment 1 is set as a DC-DC step-down circuit, that is, Figure 2 The third DC-DC step-down circuit has a higher efficiency and can further reduce the power consumption of the inverter refrigerator.

Claims

1. A circuit for reducing power consumption of a variable frequency refrigerator, characterized in that: It includes a compressor control module, a power supply control module and a refrigerator main control module; the compressor control module is used to drive the compressor to operate, and the power supply control module includes an AC input interface, a first power management circuit and a second power management circuit. The AC input interface is connected to the compressor control module through the first power conversion circuit, and the AC input interface is connected to the refrigerator main control module through the second power management circuit. The enable signal output end of the refrigerator main control module is connected to the first power management circuit for controlling the on and off of the electrical signal between the first power management circuit and the compressor control module.

2. The circuit for reducing power consumption of a variable frequency refrigerator according to claim 1, characterized in that: It also includes a load control circuit, wherein the AC power input interface is connected to the power input end of the load control circuit through the second power management circuit, the power output end of the load control circuit is connected to the power input end of the load in the refrigerator other than the compressor, and the enable signal output end of the refrigerator main control module is connected to the load control circuit for controlling the on and off of the electrical signal between the load control circuit and the load in the refrigerator other than the compressor.

3. The circuit for reducing power consumption of a variable frequency refrigerator according to claim 2, characterized in that: The first power management circuit includes a first full-bridge rectifier circuit, a first capacitor filter circuit, a first switching power supply, a first rectifier circuit, a second rectifier circuit, a power conversion circuit, and a first DC-DC step-down circuit, wherein the AC power input interface is connected to the first full-bridge rectifier circuit, the first full-bridge rectifier circuit is connected to the first capacitor filter circuit, the first capacitor filter circuit is connected to the first switching power supply, the first switching power supply circuit is connected to the first rectifier circuit and the second rectifier circuit respectively, the first rectifier circuit is connected to the power conversion circuit, and the second rectifier circuit is connected to the first DC-DC step-down circuit; The compressor control module includes a single-chip microcomputer, a drive chip and an inverter circuit. The single-chip microcomputer is connected to the drive chip, the drive chip is connected to the inverter circuit, and the inverter circuit is connected to the compressor; the first capacitor filter circuit is connected to the inverter circuit, the power conversion circuit is connected to the drive chip, and the first DC-DC step-down circuit is connected to the single-chip microcomputer.

4. The circuit for reducing power consumption of a variable frequency refrigerator according to claim 3, characterized in that: The second power management circuit includes a second full-bridge rectifier circuit, a second capacitor filter circuit, a second switching power supply, a third rectifier circuit, and a second DC-DC step-down circuit. The AC input interface is connected to the second full-bridge rectifier circuit, the second full-bridge rectifier circuit is connected to the second capacitor filter circuit, the second capacitor filter circuit is connected to the second switching power supply, the second switching power supply is connected to the third rectifier circuit, the third rectifier circuit is connected to the second DC-DC step-down circuit and the load control circuit, and the DC-DC step-down circuit is connected to the refrigerator main control module.

5. The circuit for reducing power consumption of a variable frequency refrigerator according to claim 4, characterized in that: The first full-bridge rectifier circuit and the second full-bridge rectifier circuit are the same full-bridge rectifier circuit, the first capacitor filter circuit and the second capacitor filter circuit are the same capacitor filter circuit, and the first switching power supply and the second switching power supply are the same switching power supply.

6. The circuit for reducing power consumption of a variable frequency refrigerator according to any one of claims 3 to 5, characterized in that: The power conversion circuit is a DC-DC step-down circuit or a linear voltage stabilization circuit.

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