Refrigerator low-power-consumption frequency conversion integrated plate

By optimizing the circuit design of the inverter integrated board, using high-efficiency transformers and synchronous rectification chips, and improving the DC-DC conversion and standby circuits, the problem of high standby power consumption of inverter refrigerators and freezers has been solved, and low-power refrigerator and freezer products have been realized.

CN223379060UActive Publication Date: 2025-09-23CHANGHONG MEILING CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202422552607.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-22
Publication Date
2025-09-23
Estimated Expiration
2034-10-22

AI Technical Summary

Technical Problem

The switching power supply efficiency of the inverter integrated board in existing inverter refrigerators and freezers is low, resulting in high standby power consumption of the single board, making it difficult to meet the power consumption standard of less than 0.5W required by the new European standard A-level energy efficiency.

Method used

By optimizing transformer parameters, adopting synchronous rectification chips and high-efficiency COOL-MOSFET, improving the DC-DC conversion solution, and combining it with the standby circuit design, the 15V DC power supply that is not needed is cut off, thereby reducing standby power consumption.

Benefits of technology

Significantly reduce the power consumption of single boards, meet the market demand for high-efficiency products, increase the standby power consumption of the entire machine to below 0.5W, and improve product competitiveness.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN223379060U_ABST
    Figure CN223379060U_ABST
Patent Text Reader

Abstract

The utility model discloses a low-power-consumption frequency conversion integrated board of a refrigerator, which belongs to the technical field of frequency conversion refrigerators and freezers and comprises a frequency conversion integrated board provided with a switching power supply module, a DC-DC conversion module, a frequency conversion driving module and a standby circuit. According to the utility model, the switching power supply module optimizes the switching power supply architecture, the application of the secondary DC 12V synchronous rectification technology and the like; the DC-DC conversion module changes an LDO direct-current power supply conversion scheme with low conversion efficiency into a DC-DC scheme with higher conversion efficiency. The switching power supply module uses a low-VF rectifier bridge, and an IGBT (Insulated Gate Bipolar Translator) for driving an inverter compressor to operate is changed into a COOL-MOSFET (Metal- And the standby circuit cuts off the unnecessary circuit to supply power to the inverter compressor driving circuit. The efficiency of the whole switching power supply is greatly improved, the operation efficiency is improved, the power consumption of a single board can be greatly reduced, the market demand of export markets for high-energy-efficiency products is met, and the market competitiveness of the products is improved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of variable frequency refrigerators and freezers, in particular to a low-power consumption variable frequency integrated board for refrigerators. Background Art

[0002] With the implementation of the new European standards in 2021, reducing refrigerator energy consumption and promoting green, low-carbon, and environmentally friendly practices has become a consensus across the home appliance industry. The new standards will replace the previous energy efficiency grading system, such as A+ and A++, with a total of seven energy efficiency levels, ranging from A-level, the highest, to G-level, the lowest. Currently, inverter-powered integrated boards used in inverter refrigerators and freezers typically consume around 1W of standby power due to factors such as low switching power supply efficiency and the inherent power consumption of power devices.

[0003] According to the current new European standards for high-efficiency products such as Class A and Class B, the standby power consumption of a single board should be reduced to below 0.5W, as the lower the power consumption of a single board, the greater its contribution to the static power consumption of the entire device. Therefore, a solution to reduce the power consumption of a single board is needed. Utility Model Content

[0004] In view of the above problems existing in the prior art, the purpose of the present invention is to provide a low-power frequency conversion integrated board for refrigerators to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A low-power frequency conversion integrated board for a refrigerator, comprising a frequency conversion integrated board, wherein a switching power supply module, a DC-DC conversion module, a frequency conversion drive module, and a standby circuit are provided on the frequency conversion integrated board; the switching power supply module is electrically connected to the DC-DC conversion module, the DC-DC conversion module is electrically connected to the frequency conversion drive module and the standby circuit, and the frequency conversion drive module is electrically connected to the standby circuit;

[0007] The switching power supply module includes a transformer T201, the primary coil of the transformer T201 is connected to the external power supply, and the secondary coil of the transformer T201 is connected to pins 3 and 4 of the chip U205;

[0008] Pin 2 of chip U205 is connected to one end of capacitor C206, and the other end of capacitor C206D is connected to pin 3 of chip U205;

[0009] Pin 1 of chip U205 is simultaneously connected to pin 5 of chip U205, pin 6 of chip U205, pin 7 of chip U205, and pin 8 of chip U205;

[0010] The DC-DC conversion module includes a chip U204, wherein pin 3 of the chip U204 is connected to the 12V input power supply; pin 1 of the chip U204 is grounded;

[0011] Pin 5 of chip U204 is connected to one end of resistor R237, the other end of resistor R237 is connected to one end of capacitor C216 and the 12V input power supply, and the other end of capacitor C216 is grounded;

[0012] Pin 6 of chip U204 is connected to one end of resistor R240, the other end of resistor R240 is connected to one end of capacitor C229, the other end of capacitor C229 and pin 2 of chip U204 are simultaneously connected to one end of inductor L204, and the other end of inductor L204 is connected to a 5V output power supply;

[0013] One end of the resistor R239 is connected to the 5V output power supply, and the other end of the resistor R239 is connected to pin 4 of the chip U204; the capacitor C230 is connected in parallel to both ends of the resistor R209;

[0014] One end of the resistor R238 is connected to pin 4 of the chip U204, and the other end of the resistor R238 is grounded;

[0015] The variable frequency drive module includes a MOS transistor Q3, the gate of the MOS transistor Q3 is connected to one end of a resistor R328, and the other end of the resistor R328 is connected to the source of the MOS transistor Q3;

[0016] One end of the resistor R327 is connected to the gate of the MOS tube Q3, and the other end of the resistor R327 is connected to the compressor drive output phase line;

[0017] One end of the resistor R326 is connected to one end of the resistor R327, the other end of the resistor R326 is connected to the anode of the diode D306, and the cathode of the diode D306 is connected to the other end of the resistor R327;

[0018] The standby circuit includes an optocoupler N301, an anode of the optocoupler N301 is connected to one end of a resistor R347, and the other end of the resistor R347 is connected to the variable frequency PWM signal; the cathode of the optocoupler N301 is grounded;

[0019] The positive electrode of the diode D310 is connected to the cathode of the optocoupler N301, and the negative electrode of the diode D310 is connected to the anode of the optocoupler N301;

[0020] The emitter and collector of the optocoupler N301 are connected to the voltage conversion circuit module, and the voltage conversion circuit module is connected to the 18V input port and the 15V output port.

[0021] As a further solution of the present invention: one end of the capacitor C211 in the switching power supply module is connected to pin 5 of the chip U205, the other end of the capacitor C211 is connected to one end of the resistor R224, and the other end of the resistor R224 is connected to pin 3 of the chip U205.

[0022] As a further solution of the present invention: the positive electrode of the capacitor C217 in the DC-DC conversion module is connected to the 5V output power supply, and the negative electrode of the capacitor C217 is grounded; the capacitor C231 is connected in parallel to both ends of the capacitor C217.

[0023] As a further solution of the present invention: the model of the transformer T201 is NT-ECO20.

[0024] As a further solution of the present invention: the model of the chip U205 is KP40511SGA.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] Based on the original switching power supply circuit, this utility model optimizes the switching power supply architecture by optimizing the transformer parameters, and at the same time, changes the secondary DC 12V rectification to synchronous rectification, thereby improving the efficiency of the entire switching power supply. The low-conversion-efficiency LDO DC power conversion solution is changed to a higher-conversion-efficiency DC-DC solution; a low-VF rectifier bridge is used, and the IGBT that drives the variable-frequency compressor is changed to a COOL-MOSFET to improve operating efficiency and reduce energy consumption. When the main control MCU does not have a compressor drive PWM signal, the 15V DC power supply required to drive the compressor is cut off, further reducing the power consumption in standby mode. This utility model can greatly reduce the power consumption of a single board, meet the export market's demand for high-efficiency products, and improve the product's market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a structural schematic diagram of a low-power frequency conversion integrated board for a refrigerator disclosed in an embodiment.

[0028] Figure 2 The present invention is a circuit diagram of a switching power supply module in a low-power frequency conversion integrated board of a refrigerator disclosed in an embodiment.

[0029] Figure 3 The present invention is a circuit diagram of a DC-DC conversion module in a low-power frequency conversion integrated board of a refrigerator disclosed in an embodiment.

[0030] Figure 4 The present invention is a circuit diagram of a variable frequency drive module in a low-power variable frequency integrated board for a refrigerator disclosed in an embodiment.

[0031] Figure 5The present invention is a circuit diagram of a standby circuit in a low-power frequency conversion integrated board of a refrigerator disclosed in an embodiment. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention; it is obvious that the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," and "connected" should be understood in a broad sense; for example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0034] See also Figure 1-5 A low-power frequency conversion integrated board for a refrigerator includes a frequency conversion integrated board, on which a switching power supply module, a DC-DC conversion module, a frequency conversion drive module, and a standby circuit are provided. The switching power supply module is electrically connected to the DC-DC conversion module, the DC-DC conversion module is electrically connected to the frequency conversion drive module and the standby circuit, and the frequency conversion drive module is electrically connected to the standby circuit.

[0035] like Figure 2 As shown, the switching power supply module includes a transformer T201, the primary coil of the transformer T201 is connected to the external power supply, and the secondary coil of the transformer T201 is connected to pins 3 and 4 of the chip U205;

[0036] Pin 2 of chip U205 is connected to one end of capacitor C206, and the other end of capacitor C206D is connected to pin 3 of chip U205;

[0037] Pin 1 of chip U205 is simultaneously connected to pin 5 of chip U205, pin 6 of chip U205, pin 7 of chip U205, pin 8 of chip U205, and one end of capacitor C211. The other end of capacitor C211 is connected to one end of resistor R224. The other end of resistor R224 is connected to pin 3 of chip U205.

[0038] The model of transformer T201 is NT-ECO20, and the model of chip U205 is KP40511SGA.

[0039] In a switching power supply circuit, an inefficient transformer results in higher power consumption during the primary-to-secondary power conversion process. By improving the transformer's parameters, power efficiency can be significantly improved. Simultaneously, replacing the secondary rectifier diode D204 with a synchronous rectifier chip U205 reduces rectification losses and improves DC / DC converter efficiency.

[0040] like Figure 3 As shown, the DC-DC conversion module includes a chip U204, pin 3 of the chip U204 is connected to the 12V input power supply; pin 1 of the chip U204 is grounded;

[0041] Pin 5 of chip U204 is connected to one end of resistor R237, the other end of resistor R237 is connected to one end of capacitor C216 and the 12V input power supply, and the other end of capacitor C216 is grounded;

[0042] Pin 6 of chip U204 is connected to one end of resistor R240, the other end of resistor R240 is connected to one end of capacitor C229, the other end of capacitor C229 and pin 2 of chip U204 are simultaneously connected to one end of inductor L204, and the other end of inductor L204 is connected to a 5V output power supply;

[0043] One end of the resistor R239 is connected to the 5V output power supply, and the other end of the resistor R239 is connected to pin 4 of the chip U204; the capacitor C230 is connected in parallel to both ends of the resistor R209;

[0044] One end of resistor R238 is connected to pin 4 of chip U204, and the other end of resistor R238 is grounded; the positive electrode of capacitor C217 is connected to the 5V output power supply, and the negative electrode of capacitor C217 is grounded; capacitor C231 is connected in parallel to both ends of capacitor C217;

[0045] In the DC conversion circuit, the LDO conversion circuit composed of the U204 7805 chip is replaced with a DC-DC conversion circuit composed of the U204 chip to improve the conversion efficiency.

[0046] like Figure 4 As shown, the variable frequency drive module includes a MOS transistor Q3, the gate of the MOS transistor Q3 is connected to one end of a resistor R328, and the other end of the resistor R328 is connected to the source of the MOS transistor Q3;

[0047] One end of the resistor R327 is connected to the gate of the MOS tube Q3, and the other end of the resistor R327 is connected to the compressor drive output phase line;

[0048] One end of the resistor R326 is connected to one end of the resistor R327, the other end of the resistor R326 is connected to the anode of the diode D306, and the cathode of the diode D306 is connected to the other end of the resistor R327;

[0049] In the variable frequency drive circuit, the IGBT power device originally used in Q301 was replaced with a more efficient COOL-MOSFET through device selection.

[0050] like Figure 5 As shown, the standby circuit includes an optocoupler N301, the anode of the optocoupler N301 is connected to one end of the resistor R347, and the other end of the resistor R347 is connected to the variable frequency PWM signal; the cathode of the optocoupler N301 is grounded;

[0051] The positive electrode of the diode D310 is connected to the cathode of the optocoupler N301, and the negative electrode of the diode D310 is connected to the anode of the optocoupler N301;

[0052] The emitter and collector of the optocoupler N301 are connected to the voltage conversion circuit module, which is connected to the 18V input port and the 15V output port. The voltage conversion circuit module is used to convert the 18V power supply into a 15V power supply.

[0053] In the standby circuit, when the main control MCU does not have the compressor variable frequency drive PWM signal, the primary and secondary terminals of the N301 optocoupler are both off, and the 18V to 15V module circuit does not operate. When the main control MCU sends the compressor variable frequency drive PWM signal, the primary and secondary terminals of the N301 optocoupler are on, and the 18V to 15V module circuit starts to operate, supplying power to the variable frequency drive circuit.

[0054] This utility model aims to develop a low-power, frequency-converting integrated board. This new low-power, frequency-converting integrated board is expected to increase single-board power consumption by approximately 8%, and reduce the overall standby power consumption to below 0.5W. This will meet the export market's demand for high-efficiency products and enhance product competitiveness.

[0055] The utility model has a high-efficiency power supply. On the basis of the original switching power supply circuit, the transformer parameters are optimized and the switching power supply architecture is optimized. At the same time, the secondary DC 12V rectification is changed to synchronous rectification, thereby improving the efficiency of the entire switching power supply.

[0056] The utility model changes the low-conversion-efficiency LDO DC power conversion scheme into a higher-conversion-efficiency DC-DC scheme; changes the low-conversion-efficiency LDO DC power conversion scheme into a higher-conversion-efficiency DC-DC scheme; uses a low-VF rectifier bridge, and replaces the IGBT that drives the variable-frequency compressor with a COOL-MOSFET to improve operating efficiency and reduce energy consumption.

[0057] In the present invention, when the main control MCU does not have a compressor driving PWM signal, the 15V DC power supply required to drive the compressor is cut off, thereby further reducing the power consumption during standby mode.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims, not the foregoing description, and is intended to encompass all variations within the meaning and range of equivalents of the claims, and any reference numerals in the claims should not be construed as limiting the claims to which they relate.

[0059] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A low-power frequency conversion integrated board for refrigerators, comprising a frequency conversion integrated board, characterized in that: The frequency conversion integrated board is provided with a switching power supply module, a DC-DC conversion module, a frequency conversion drive module and a standby circuit. The switching power supply module is electrically connected to the DC-DC conversion module, the DC-DC conversion module is electrically connected to the frequency conversion drive module and the standby circuit at the same time, and the frequency conversion drive module is electrically connected to the standby circuit. The switching power supply module includes a transformer T201, the primary coil of the transformer T201 is connected to the external power supply, and the secondary coil of the transformer T201 is connected to pins 3 and 4 of the chip U205; Pin 2 of chip U205 is connected to one end of capacitor C206, and the other end of capacitor C206D is connected to pin 3 of chip U205; Pin 1 of chip U205 is simultaneously connected to pin 5 of chip U205, pin 6 of chip U205, pin 7 of chip U205, and pin 8 of chip U205; The DC-DC conversion module includes a chip U204, wherein pin 3 of the chip U204 is connected to the 12V input power supply; pin 1 of the chip U204 is grounded; Pin 5 of chip U204 is connected to one end of resistor R237, the other end of resistor R237 is connected to one end of capacitor C216 and the 12V input power supply, and the other end of capacitor C216 is grounded; Pin 6 of chip U204 is connected to one end of resistor R240, the other end of resistor R240 is connected to one end of capacitor C229, the other end of capacitor C229 and pin 2 of chip U204 are simultaneously connected to one end of inductor L204, and the other end of inductor L204 is connected to a 5V output power supply; One end of the resistor R239 is connected to the 5V output power supply, and the other end of the resistor R239 is connected to pin 4 of the chip U204; the capacitor C230 is connected in parallel to both ends of the resistor R209; One end of the resistor R238 is connected to pin 4 of the chip U204, and the other end of the resistor R238 is grounded; The variable frequency drive module includes a MOS transistor Q3, the gate of the MOS transistor Q3 is connected to one end of a resistor R328, and the other end of the resistor R328 is connected to the source of the MOS transistor Q3; One end of the resistor R327 is connected to the gate of the MOS tube Q3, and the other end of the resistor R327 is connected to the compressor drive output phase line; One end of the resistor R326 is connected to one end of the resistor R327, the other end of the resistor R326 is connected to the anode of the diode D306, and the cathode of the diode D306 is connected to the other end of the resistor R327; The standby circuit includes an optocoupler N301, an anode of the optocoupler N301 is connected to one end of a resistor R347, and the other end of the resistor R347 is connected to the variable frequency PWM signal; the cathode of the optocoupler N301 is grounded; The positive electrode of the diode D310 is connected to the cathode of the optocoupler N301, and the negative electrode of the diode D310 is connected to the anode of the optocoupler N301; The emitter and collector of the optocoupler N301 are connected to the voltage conversion circuit module, and the voltage conversion circuit module is connected to the 18V input port and the 15V output port.

2. A low-power frequency conversion integrated board for refrigerator according to claim 1, characterized in that: One end of the capacitor C211 in the switching power supply module is connected to pin 5 of the chip U205, the other end of the capacitor C211 is connected to one end of the resistor R224, and the other end of the resistor R224 is connected to pin 3 of the chip U205.

3. The low-power frequency conversion integrated board for refrigerator according to claim 1, characterized in that: The positive electrode of the capacitor C217 in the DC-DC conversion module is connected to the 5V output power supply, and the negative electrode of the capacitor C217 is grounded; the capacitor C231 is connected in parallel to both ends of the capacitor C217.

4. The low-power frequency conversion integrated board for refrigerator according to claim 1, characterized in that: The model of the transformer T201 is NT-ECO20.

5. The low-power frequency conversion integrated board for refrigerator according to claim 1, characterized in that: The model of the chip U205 is KP40511SGA.