Low-power-consumption high-efficiency main transformer integrated plate for air-cooled refrigerator

Abstract

The utility model discloses a low-power-consumption high-efficiency main transformer integrated board for an air-cooled refrigerator, which comprises an X capacitor discharge circuit, a variable-frequency power supply circuit, a bus voltage sampling circuit, a mains supply voltage sampling circuit and an IGBT (Insulated Gate Bipolar Translator) driving circuit, and is characterized in that the X capacitor discharge circuit uses a discharge chip to replace a traditional discharge resistor; the variable-frequency power supply circuit is additionally provided with a variable-frequency power supply switch circuit, the bus and commercial power voltage sampling circuit modifies the resistance value of a divider resistor, and the IGBT driving circuit modifies the resistance value of a resistor. According to the utility model, improvement is made on the basis of a traditional air-cooled refrigerator main transformer integrated plate, the standby power consumption and the operation power consumption of the main transformer integrated plate are reduced, and the low-power-consumption and high-efficiency electric control design is realized.

Description

Technical Field

[0001] This utility model relates to the field of air-cooled refrigerator technology, specifically to a low-power, high-efficiency integrated main transformer board for air-cooled refrigerators. Background Technology

[0002] Refrigerators are common household appliances. In recent years, with the increasingly serious energy problem, consumers have been demanding higher energy-efficiency refrigerators. However, the energy efficiency of refrigerators currently on the market is not high, and the industry lacks effective technical solutions to improve energy efficiency, which cannot meet market needs. Moreover, traditional improvement solutions generally focus on external aspects, such as adding VIP panels, increasing the thickness of the foam layer, and setting up throttling valves, rarely involving the circuit control aspect. Therefore, there is still room for improvement in the circuit control aspect of refrigerator energy efficiency. Utility Model Content

[0003] The purpose of this utility model is to provide a low-power, high-efficiency integrated main transformer board for air-cooled refrigerators, which solves the problem of low energy efficiency in current air-cooled refrigerators and overcomes the shortcomings of existing technologies.

[0004] This utility model provides a low-power, high-efficiency integrated main transformer board for air-cooled refrigerators through the following technical solution, including a main control chip, an X-capacitor discharge circuit, a frequency converter power supply circuit, a bus voltage sampling circuit and an AC voltage sampling circuit, and an IGBT drive circuit. The X-capacitor discharge circuit includes a fuse (FUSE), a capacitor (CX1), resistors (R1, R2), and a chip (U1). The chip U1 is connected in series with R1 and R2 and in parallel with the capacitor (CX1). When AC voltage is applied, the chip U1 is internally disconnected; when AC voltage is disconnected, the chip U1 is internally connected. The frequency converter power supply circuit includes a half-bridge rectifier and filter circuit, a frequency converter power supply switching circuit, and a voltage regulator circuit. The frequency converter power supply switching circuit includes an optocoupler, a PMOS transistor (QT), resistors (R3, R4, R5, R6), with R3 connected to the source and drain of the QT respectively. R4 and R5 are connected in series, and the common terminal of R4 and R5 is connected to the QT. The gate of the optocoupler includes pins 1, 2, 3, and 4. Pin 1 is connected to the voltage input, pin 2 is connected in series with resistor R6 and then to the PWR_CTR pin of the main control chip, pin 3 is connected to resistor R5, and pin 4 is grounded. The bus voltage sampling circuit includes resistors R8, R9, R10, R11, R12, and capacitor C7. Resistors R8, R9, R10, R11, and R12 are connected in series, and capacitor C7 is connected in parallel with resistor R12. The connection point between R11 and R12 is the sampling point. The total resistance of resistors R8, R9, R10, and R11 is greater than 2000kΩ, and the resistance of resistor R12 is greater than 10kΩ. The IGBT drive circuit includes resistors R18 and R19, IGBT, and capacitor C9. Resistor R9 and capacitor C9 are connected in parallel and in series with resistor R18. The common terminal of resistors R18 and R19 is connected to the gate of the IGBT. The resistance of resistor R18 is ≥600Ω.

[0005] Furthermore, the current input terminal of the variable frequency power supply switching circuit is connected to the current output terminal of the half-bridge rectifier and filter circuit, and the current output terminal of the variable frequency power supply switching circuit is connected to the current input terminal of the voltage regulator circuit.

[0006] Furthermore, the resistors R8, R9, R10, and R11 have a resistance of 560kΩ, and the resistor R12 has a resistance of 12kΩ.

[0007] Furthermore, the resistance of resistor R18 is 680Ω.

[0008] Furthermore, the circuit structure of the mains voltage sampling circuit is the same as that of the bus voltage sampling circuit. The bus voltage sampling circuit is connected to a DC 310V input, and the mains voltage sampling circuit is connected to an AC 220V input.

[0009] The present invention has the following beneficial effects: The present invention provides a low-power, high-efficiency integrated main transformer board for air-cooled refrigerators. It is an improvement on the traditional integrated main transformer board for air-cooled refrigerators. The specific improvements are reflected in the circuit design of the X capacitor discharge circuit, the frequency converter power supply circuit, the voltage sampling circuit and the IGBT drive circuit, which reduces the standby power consumption and operating power consumption of the integrated main transformer board and realizes a low-power, high-efficiency electronic control design. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the X capacitor discharge circuit of a low-power, high-efficiency integrated main transformer board for an air-cooled refrigerator, as described in this utility model.

[0011] Figure 2 This is a schematic diagram of the inverter power supply circuit for a low-power, high-efficiency integrated main transformer board for an air-cooled refrigerator, as described in this utility model.

[0012] Figure 3 This is a schematic diagram of the bus voltage sampling circuit and the mains voltage sampling circuit of a low-power, high-efficiency integrated main transformer board for an air-cooled refrigerator, as described in this utility model.

[0013] Figure 4 This is a schematic diagram of the IGBT drive circuit of a low-power, high-efficiency integrated main transformer board for an air-cooled refrigerator according to the present invention.

[0014] exist Figure 2 In the diagram, the circuit in box 1 is a half-bridge rectifier and filter circuit, the circuit in box 2 is a frequency converter power supply switch circuit, and the circuit in box 3 is a voltage regulator circuit. Detailed Implementation

[0015] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0016] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0017] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0020] The following reference Figures 1-4 This application describes a low-power, high-efficiency integrated main transformer board for an air-cooled refrigerator, according to some embodiments thereof.

[0021] A low-power, high-efficiency integrated main transformer board for air-cooled refrigerators includes a main control chip, an X-capacitor discharge circuit, a frequency converter power supply circuit, a bus voltage sampling circuit and an AC voltage sampling circuit, as well as an IGBT drive circuit.

[0022] The X-capacitor discharge circuit includes a fuse (FUSE), a capacitor (CX1), resistors (R1, R2), and a chip (CAP200DG). Chip U1 is connected in series with R1 and R2, and in parallel with capacitor CX1. Traditional circuits do not have a chip to control the on / off state of the resistor loop; therefore, current flows through the resistor during circuit operation, resulting in power loss. With chip U1, when the AC voltage is off, chip U1 internally connects, discharging capacitor CX1; when the AC voltage is applied, chip U1 internally disconnects, preventing current flow and thus reducing power loss.

[0023] The frequency converter power supply circuit consists of three parts: a half-bridge rectifier and filter circuit, a frequency converter power supply switching circuit, and a voltage regulator circuit. The half-bridge rectifier and filter circuit and the voltage regulator circuit adopt the traditional integrated main transformer board circuit scheme. Based on the traditional scheme, a frequency converter power supply switching circuit is added between the half-bridge rectifier and filter circuit and the voltage regulator circuit. The frequency converter power supply switching circuit includes an optocoupler, a PMOS transistor QT, and resistors R3, R4, R5, and R6. The two ends of R3 are connected to the source and drain of QT respectively. R4 and R5 are connected in series, and the common terminal of R4 and R5 is connected to the gate of QT. The optocoupler includes pins 1, 2, 3, and 4. Pin 1 is connected to the voltage input, pin 2 is connected in series with resistor R6 and then connected to the PWR_CTR pin of the main control chip, pin 3 is connected to resistor R5, and pin 4 is grounded. Specifically, the PWR_CTR pin of the main control chip controls the optocoupler to turn on or off, thereby turning the voltage divider resistor circuit of R2 and R3 on or off. When the voltage divider resistor circuit is on, the gate of QT receives voltage, the source and drain of QT are connected, and the frequency converter power supply is turned on. When the voltage divider resistor circuit is off, the gate of QT has no driving voltage, the source and drain of QT are disconnected, and the frequency converter power supply is turned off. This allows the frequency converter power supply circuit to be turned off when not needed, reducing power loss.

[0024] The bus voltage sampling circuit includes resistors R8, R9, R10, R11, R12, and capacitor C7. Resistors R8, R9, R10, R11, and R12 are connected in series, and capacitor C7 is connected in parallel with resistor R12. The connection point between resistors R11 and R12 is the sampling point. Compared with the circuit of the traditional integrated transformer board, the circuit connection of the voltage sampling circuit remains unchanged, but the resistance values ​​in the circuit are modified so that the sum of the resistance values ​​of resistors R8, R9, R10, and R11 is greater than 2000kΩ, and the resistance value of resistor R12 is greater than 10kΩ. Specifically, in the traditional circuit, the resistance values ​​of resistors R8, R9, R10, and R11 are all 330kΩ, and the resistance value of resistor R12 is 7.5kΩ. In the improved circuit, the resistance values ​​of resistors R8, R9, R10, and R11 are all 560kΩ, and the resistance value of resistor R12 is 12kΩ. By modifying the resistance value, the voltage at the sampling point is increased, and the loop current is decreased, thereby reducing power loss. The circuit structure of the mains voltage sampling circuit is the same as that of the bus voltage sampling circuit. The bus voltage sampling circuit is connected to a DC 310V input, and the mains voltage sampling circuit is connected to an AC 220V input.

[0025] The IGBT drive circuit includes resistors R18 and R19, the IGBT, and capacitor C9. Resistor R9 and capacitor C9 are connected in parallel and in series with resistor R18. The common terminal of resistors R18 and R19 is connected to the gate of the IGBT. Compared with the circuit of the traditional integrated transformer board, the circuit connection of the IGBT drive circuit remains unchanged, but the resistance value of the resistors in the circuit is modified so that the resistance of resistor R18 is ≥600Ω. Specifically, the resistance of resistor R18 in the traditional circuit is 270Ω, while the resistance of resistor R18 in the improved circuit is 680Ω. By modifying the resistance value of resistor R18, the voltage drop across R18 is increased, thereby enabling capacitor C9 to charge quickly, effectively accelerating the turn-on speed of the IGBT, reducing thermal resistance, and reducing power loss.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-power high-efficiency main transformer integrated board for a forced air cooling refrigerator, comprising a main control chip, an X capacitor discharge circuit, a variable frequency power supply circuit, a bus voltage sampling circuit and a commercial power voltage sampling circuit, and an IGBT drive circuit, characterized in that, The X capacitor discharge circuit includes a fuse FUSE, a capacitor CX1, resistors R1 and R2, and a chip U1, the chip U1 is connected in series with the resistors R1 and R2 and in parallel with the capacitor CX1, when an AC voltage is connected, the chip U1 is internally disconnected, when the AC voltage is disconnected, the chip U1 is internally connected; the variable frequency power supply circuit includes a half-bridge rectification and filtering circuit, a variable frequency power supply switching circuit, and a voltage stabilizing circuit; the variable frequency power supply switching circuit includes a photoelectric coupler, a PMOS tube QT, resistors R3, R4, R5, and R6, the resistors R3 are connected to the source and drain of the QT respectively, the resistors R4 and R5 are connected in series, and the common connection end of the resistors R4 and R5 is connected to the gate of the QT, the photoelectric coupler includes pins 1, 2, 3, and 4, the pin 1 is connected to a voltage input, the pin 2 is connected to the resistor R6 and then to the PWR_CTR pin of the main control chip in series, the pin 3 is connected to the resistor R5, and the pin 4 is grounded; the bus voltage sampling circuit includes resistors R8, R9, R10, R11, R12, and a capacitor C7, the resistors R8, R9, R10, R11, and R12 are connected in series, the capacitor C7 is connected in parallel with the resistor R12, the connection point of the resistors R11 and R12 is a sampling point, the sum of the resistances of the resistors R8, R9, R10, and R11 is greater than 2000kΩ, and the resistance of the resistor R12 is greater than 10kΩ; the IGBT driving circuit includes resistors R18 and R19, an IGBT, and a capacitor C9, the resistor R9 is connected in parallel with the capacitor C9 and in series with the resistor R18, the common connection end of the resistors R18 and R19 is connected to the gate of the IGBT, and the resistance of the resistor R18 is greater than or equal to 600Ω.

2. The low-power high-efficiency main transformer integrated panel for a forced air cooling refrigerator according to claim 1, characterized in that, The current input end of the variable frequency power supply switching circuit is connected to the current output end of the half-bridge rectification and filtering circuit, and the current output end of the variable frequency power supply switching circuit is connected to the current input end of the voltage stabilizing circuit.

3. The low-power high-efficiency main transformer integrated panel for a forced air cooling refrigerator according to claim 1, characterized in that, The resistances of the resistors R8, R9, R10, and R11 are 560kΩ, and the resistance of the resistor R12 is 12kΩ.

4. The low-power high-efficiency main transformer integrated panel for a forced air cooling refrigerator according to claim 1, characterized in that, The resistance of the resistor R18 is 680Ω.

5. The low-power high-efficiency main transformer integrated panel for a forced air cooling refrigerator according to claim 1, characterized in that, The circuit structure of the commercial voltage sampling circuit is the same as that of the bus voltage sampling circuit, the bus voltage sampling circuit is connected to a DC 310V input, and the commercial voltage sampling circuit is connected to an AC 220V input.

Images