CN110887340A - Refrigerator and its main transformer integrated board - Google Patents

Abstract

The application relates to a refrigerator and its main transformer integrated board. The main transformer integrated board includes a base plate and a control circuit arranged on the base plate. The control circuit includes a switching power supply circuit, a refrigerator load control circuit and a compressor drive circuit. The refrigerator load control circuit is connected to a switch The power supply circuit and the compressor drive circuit, the compressor drive circuit is used to connect the compressor of the refrigerator, and the height of each electronic component in the control circuit is less than or equal to 20 mm. The switching power supply circuit, the refrigerator load control circuit and the compressor drive circuit are integrated to realize the control of the refrigerator, and the height of each electronic component in the control circuit is less than or equal to 20 mm, which effectively reduces the thickness of the main transformer integrated board, so that the The height of the installation box on which the main transformer integrated board is placed can be reduced, which provides the effective volume of the refrigerator compared with the traditional refrigerator controller.

Description

Refrigerator and its main transformer integrated board

technical field

The present application relates to the technical field of intelligent electrical equipment, and in particular, to a refrigerator and its main-transformer integrated board.

Background technique

The inverter refrigerator control panel usually uses three main control panel and inverter panel display panel to realize the control operation. With the maturity of frequency conversion technology of refrigerator compressors, the diversification of frequency conversion drive solutions, and the need for cost control, the main-transformer integrated board solution that integrates the main control board and the variable-frequency drive board is more and more popular in refrigerators. The main-transformer integrated board includes power supply circuit, EMI (Electromagnetic Interference, electromagnetic interference) filter circuit, IGBT drive compressor circuit, etc., with high integration, many power devices are used, and there are special requirements for the refrigerator controller installation box.

Traditional refrigerators usually pre-embed the installation box in the foam layer or on the top of the U-shell of the refrigerator. Pre-embedding the installation box in the foam layer requires the thickness of the foam layer to be designed to be thick enough to prevent condensation on the control panel. However, an excessively thick foam layer will reduce the volume of the refrigerator, and placing the installation box on the top of the U-shell of the refrigerator will also bring about the problem of the height of the installation box cover. The traditional refrigerator controller reduces the effective volume of the refrigerator.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a refrigerator and its main transformer integrated board which can increase the effective volume of the refrigerator in order to solve the problem of reducing the effective volume of the refrigerator by the traditional refrigerator controller.

A main-transformer integrated board of a refrigerator includes a base plate and a control circuit arranged on the base plate,

The control circuit includes a switching power supply circuit, a refrigerator load control circuit and a compressor drive circuit, the refrigerator load control circuit is connected to the switching power supply circuit and the compressor drive circuit, and the compressor drive circuit is used to connect the refrigerator. For the compressor, the height of each electronic component in the control circuit is less than or equal to 20 mm.

In one embodiment, the switching power supply circuit includes a common mode choke coil, a rectifier bridge, a transformer, an output circuit, a feedback circuit and a power supply control circuit, and the common mode choke coil is connected to the transformer through the rectifier bridge the primary winding of the transformer, the output circuit is connected to the secondary winding of the transformer, the refrigerator load control circuit and the compressor drive circuit, the feedback circuit is connected to the output circuit and the power supply control circuit, the power supply A control circuit is connected to the primary winding of the transformer.

In one embodiment, the switching power supply circuit further includes an electrolytic capacitor CE1 and an electrolytic capacitor CE6, the input side of the rectifier bridge is connected to the common mode choke coil, and the output side of the rectifier bridge is connected to the transformer. The primary winding, the electrolytic capacitor CE1 and the electrolytic capacitor CE6 are connected in parallel to the output side of the rectifier bridge.

In one embodiment, the common mode choke coil is a CLJ-UU11016 type common mode choke coil with a height of 20 mm, the transformer is a horizontal EE20 type transformer with a height of 19 mm, the electrolytic capacitor CE1 and all The electrolytic capacitors CE6 are all electrolytic capacitors with a height of 20 mm and a capacity of 120uF/450V.

In one embodiment, the compressor drive circuit includes a three-way single-phase drive circuit, and the three-way single-phase drive circuits are all connected to the switching power supply circuit and the refrigerator load control circuit, and are used to connect the refrigerator compressor.

In one embodiment, each single-phase drive circuit includes a drive chip, a switch tube assembly and a heat sink, the drive chip is connected to the switching power supply circuit and the refrigerator load control circuit, and the switch tube assembly is connected to the The driving chip is also used to connect the compressor of the refrigerator, and the heat sink is correspondingly arranged with the switch tube assembly.

In one embodiment, the heat sink is an L-shaped IGBT heat sink with a height of 20 mm.

In one of the embodiments, the control circuit further includes a communication circuit connected to the refrigerator load control circuit.

A refrigerator includes the above-mentioned main-transformer integrated board.

In one embodiment, the refrigerator further includes an installation box, the main-transformer integrated board is arranged in the installation box, and the distance between the cover of the installation box and the upper surface of the live parts on the main-transformer integrated board is greater than or equal to 8 mm.

The above refrigerator and its main transformer integrated board integrate the switching power supply circuit, the refrigerator load control circuit and the compressor drive circuit to realize the control of the refrigerator, and the height of each electronic component in the control circuit is less than or equal to 20 mm, effectively reducing the main By changing the thickness of the integrated board, the height of the installation box for placing the main integrated board can be reduced, and compared with the traditional refrigerator controller, the effective volume of the refrigerator is provided.

Description of drawings

1 is a structural block diagram of a control circuit of a main-transformer integrated board in an embodiment;

2 is a structural block diagram of a control circuit of a main-transformer integrated board in another embodiment;

3 is a schematic structural diagram of a switching power supply circuit in an embodiment;

4 is a schematic structural diagram of a refrigerator load control circuit in an embodiment;

5 is a schematic structural diagram of a compressor drive circuit in an embodiment;

Fig. 6 is the structural principle diagram of the U-phase drive circuit in Fig. 5;

FIG. 7 is a schematic diagram of the structure of the V-phase drive circuit in FIG. 5;

FIG. 8 is a schematic structural diagram of the W-phase drive circuit in FIG. 5 .

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

In one embodiment, a main-transformer integrated board of a refrigerator is provided, which includes a base plate and a control circuit disposed on the base plate. As shown in FIG. 1 , the control circuit includes a switching power supply circuit 110, a refrigerator load control circuit 120 and a compressor drive circuit 130. The refrigerator load control circuit 120 is connected to the switching power supply circuit 110 and the compressor drive circuit 130. The compressor drive circuit 130 is used for Connected to the compressor 210 of the refrigerator, the height of each electronic component in the control circuit is less than or equal to 20 mm.

Specifically, the switching power supply circuit 110 is also connected to the compressor drive circuit 130, and is used to supply power to the refrigerator load control circuit 120 and the compressor drive circuit 130 after being connected to an external power source for processing. The refrigerator load control circuit 120 may control the compressor drive circuit 130 to drive and control the compressor 210 according to parameters detected by sensors inside the refrigerator, or in combination with control instructions sent by the user through an interactive interface of the refrigerator. The control circuit can specifically include different electronic components such as resistors, capacitors, switch tubes, etc. By screening the specifications of the electronic components in the control circuit, the height of each electronic component is controlled to be less than or equal to 20 mm, thereby reducing the main transformer. The thickness of the integrated board enables the height of the installation box for installing the main-transformer integrated board to be designed to be smaller, thereby reducing the space where the installation box is located and increasing the effective volume of the refrigerator.

In addition, in one embodiment, as shown in FIG. 2 , the control circuit further includes a communication circuit 140 connected to the refrigerator load control circuit 120 . The refrigerator load control circuit 120 may perform data transmission with other refrigerator devices through the communication circuit 140 , and may also use the communication circuit 140 to receive control commands sent by the user to drive and control the compressor 210 .

The above-mentioned main transformer integrated board of the refrigerator integrates the switching power supply circuit 110, the refrigerator load control circuit 120 and the compressor drive circuit 130 to realize the control of the refrigerator, and the height of each electronic element in the control circuit is less than or equal to 20 mm, effectively The thickness of the main transformer integrated board is reduced, so that the height of the installation box for placing the main transformer integrated board can be reduced, and compared with the traditional refrigerator controller, the effective volume of the refrigerator is provided.

The specific structure of the switching power supply circuit 110 is not unique. In one embodiment, as shown in FIG. 3 , the switching power supply circuit 110 includes a common mode choke coil L2, a rectifier bridge BR, a transformer T1, an output circuit 112, a feedback circuit 114 and The power supply control circuit 116, the common mode choke coil L2 is connected to the primary winding of the transformer T1 through the rectifier bridge BR, the output circuit 112 is connected to the secondary winding of the transformer T1, the refrigerator load control circuit 120 and the compressor drive circuit 130, and the feedback circuit 114 is connected to the output The circuit 112 and the power control circuit 116, the power control circuit 116 is connected to the primary winding of the transformer T1.

The external mains power is sent to the rectifier bridge BR through the common mode choke coil L2 for rectification, and the direct current is sent to the primary winding of the transformer T1. The compressor drive circuit 130 supplies power. The feedback circuit 114 detects the voltage delivered by the output circuit 112 and feeds it back to the power supply control circuit 116. The power supply control circuit 116 controls the on-off of the loop where the primary winding of the transformer T1 is located according to the feedback voltage, so as to maintain the output voltage of the switching power supply circuit 110. constant.

In one implementation, the switching power supply circuit 110 further includes an electrolytic capacitor CE1 and an electrolytic capacitor CE6, the input side of the rectifier bridge BR is connected to the common mode choke coil L2, the output side of the rectifier bridge BR is connected to the primary winding of the transformer T1, the electrolytic capacitors CE1 and The electrolytic capacitors CE6 are all connected in parallel to the output side of the rectifier bridge BR.

Among them, the common mode choke coil L2 is a CLJ-UU11016 type common mode choke coil with a height of 20 mm, the transformer T1 is a horizontal EE20 type transformer with a height of 19 mm, and the electrolytic capacitor CE1 and electrolytic capacitor CE6 are both 20 mm high and capacity. It is an electrolytic capacitor of 120uF/450V. By improving the electronic components in the switching power supply circuit 110, the electrolytic capacitor CE1 and electrolytic capacitor CE6 are selected to replace the general 220uF/450V electrolytic capacitor, and the specifications of the common mode choke coil L2 and the transformer T1 are screened to optimize the layout and wiring. , reduce the height of the main transformer integrated board.

Specifically, the primary winding of the transformer T1 includes two windings, one input end of the common mode choke coil L2 is connected to the live wire L, the other input end is connected to the neutral wire N, and two output ends of the common mode choke coil L2 are respectively connected to the rectifier The port 2 and port 3 of the input side of the bridge BR, in the primary winding of the transformer T1, the port 5 of one winding is connected to the port 1 of the output side of the rectifier bridge BR, the port 4 of the winding is connected to the power control circuit 116, and the port of the other winding is connected. 1 is connected to feedback circuit 114, and port 2 of the winding is grounded. Among them, the common mode choke coil L2 can use the CH-305-015 16mH common mode choke coil, the rectifier bridge BR can use the GBU8K type rectifier bridge, and the transformer T1 can use the EE20-29 type transformer. In addition, the switching power supply circuit 110 may also include a fuse F1, a varistor RV1, a thermistor NTC1, and other electronic components such as resistors, capacitors, diodes, and voltage regulators. The specific structure is shown in FIG. 3, which is not repeated here. Repeat.

Further, the output circuit 112 includes a capacitor CE2, an inductor L1, a voltage regulator chip U4 and a voltage regulator chip U9. Among them, both the voltage regulator chip U4 and the voltage regulator chip U9 can use the LD1117 chip. The voltage output by the secondary winding of the transformer T1 is outputted by the capacitor CE2 and the inductor L1 to output a voltage of ﹢12V. The voltage of ﹢12V is regulated by an LD1117 chip to output a 15V voltage, and the 15V voltage is regulated by another LD1117 chip to output a 5V voltage. The output circuit 112 provides three different voltage outputs to meet different power supply requirements of other circuits. In addition, the output circuit 112 may also include devices such as resistors, capacitors, and diodes, as shown in FIG. 3 , and details are not described herein again.

3, the feedback circuit 114 may include an optocoupler U2, a voltage reference chip U1 and two sampling circuits, wherein one sampling circuit includes a resistor R2 and a resistor R7, and the other sampling circuit includes a resistor R9 and a resistor R10. Resistor R2 and resistor R7 are connected in series, and the common end is connected to the input end of the light-emitting tube of the optocoupler U2, the other end of the resistor R7 is connected to one end of the inductor L1 close to the transformer T1, and the other end of the resistor R2 is connected to the output end of the light-emitting tube of the optocoupler U2 . The resistor R9 and the resistor R0 are connected in series and the common tube is connected to the control terminal of the voltage reference chip U1, the input terminal of the voltage reference chip U1 is connected to the output terminal of the light-emitting tube of the optocoupler U2, and the output terminal of the voltage reference chip U1 is grounded. The other end of the resistor R9 is connected to one end of the inductor L1 away from the transformer T1, and the other end of the resistor R10 is grounded. The input end of the receiving tube of the optocoupler U2 is connected to the port 1 of the winding of the transformer T1 through the corresponding resistance, and the output end of the receiving tube of the optocoupler U2 is connected to the power control circuit 116 . In addition, the feedback circuit 114 also includes other elements such as resistors and capacitors.

Specifically, the LTV-816S optocoupler can be used as the optocoupler U2, and the CJ431 chip can be used as the voltage reference chip U1. In this embodiment, the optocoupler U2 and the voltage reference chip U1 are used to detect the voltage transmitted by the output circuit 112 and return the corresponding feedback signal to the power supply control circuit 116, which is used as the power supply control circuit 116 to control the voltage output and realize the signal transmission. The isolated transmission improves the working stability of the switching power supply circuit 110 .

In one embodiment, as shown in FIG. 3 , the power control circuit 116 includes a control chip IC1 , and the control chip IC1 is connected to the primary winding of the transformer T1 and the feedback circuit 114 . Specifically, the control chip IC1 can be a TOP264 chip. In addition, the power control circuit 116 can also include elements such as resistors, capacitors, diodes, and voltage regulators.

In one embodiment, as shown in FIG. 4 , the refrigerator load control circuit 120 includes a main controller IC8 and a peripheral circuit, and the main controller IC8 is connected to the switching power supply circuit 110 and the compressor driving circuit 130 through the peripheral circuit. Among them, the main controller IC8 can use the S6E1A12B0A chip, and the peripheral circuit can include the crystal oscillator X2 connected to the main controller IC8 and the indicator LED1. In addition, peripheral circuits may also include elements such as resistors, capacitors, and diodes.

In one embodiment, as shown in FIG. 5 , the compressor drive circuit 130 includes a three-way single-phase drive circuit, and the three-way single-phase drive circuits are all connected to the switching power supply circuit 110 and the refrigerator load control circuit 120, and are used to connect the refrigerator compressor 210. For convenience of description, the three-way single-phase driving circuits may be referred to as a U-phase driving circuit 132 , a V-phase driving circuit 134 and a W-phase driving circuit 136 respectively. The U-phase driving circuit 132 , the V-phase driving circuit 134 and the W-phase driving circuit 136 are all connected to the refrigerator load control circuit 120 , and are connected to the compressor 210 of the refrigerator through the interface CN20 . It can be understood that the compressor driving circuit 130 may further include other elements such as resistors, capacitors, diodes, etc., specifically referring to FIG. 5 , which will not be repeated here.

In one embodiment, each single-phase drive circuit includes a drive chip, a switch tube assembly and a heat sink, the drive chip is connected to the switching power supply circuit 110 and the refrigerator load control circuit 120, the switch tube assembly is connected to the drive chip, and is also used to connect the refrigerator. For the compressor 210, the radiating fins are arranged corresponding to the switch tube assembly.

Specifically, FIGS. 6 to 8 are the structural schematic diagrams of the U-phase drive circuit 132 , the V-phase drive circuit 134 and the W-phase drive circuit 136 respectively. The U-phase drive circuit 132 includes a drive chip U5 , and is composed of a switch tube IG1 and a switch tube. The switch tube assembly composed of IG4. The V-phase drive circuit 134 includes a drive chip U6 and a switch tube assembly composed of a switch tube IG2 and a switch tube IG5. The W-phase drive circuit 136 includes a drive chip U7 and a switch tube assembly composed of a switch tube IG3 and a switch tube IG6. Among them, the driver chip U5, the driver chip U6 and the driver chip U7 can all use the L6388 chip, and the switch tube IG1, the switch tube IG4, the switch tube IG2, the switch tube IG5, the switch tube IG3 and the switch tube IG6 can all use the STGF4M65DF2 type triode. In addition, the three-way single-phase drive circuit can also include elements such as resistors, capacitors, and diodes.

Taking the U-phase drive circuit 132 as an example, as shown in FIG. 6 , the drive chip U5 is connected to the main controller IC8 in the refrigerator load control circuit 120, and is also connected to the control terminals of the switch IG1 and the switch IG4, and the input terminal of the switch IG1. The power supply access terminal P is connected, the output terminal of the switch tube IG1 is connected to the input terminal of the switch tube IG4 and the U-phase terminal of the compressor 210, and the output terminal of the switch tube IG4 is grounded through the resistor RS1. A heat sink is also provided at the positions of the switch tube IG1 and the switch tube IG4 to dissipate heat. The heat sink can be driven by the main controller IC8 to dissipate heat, or it can be driven by an external control circuit to dissipate heat. The structures of the V-phase driving circuit 134 and the W-phase driving circuit 136 are similar to those of the U-phase driving circuit 132 , and details are not described herein again.

Specifically, in one embodiment, the heat sink is an L-shaped IGBT heat sink with a height of 20 mm. The L-shaped IGBT heat sink with a height of 20mm is selected. Compared with the general rectangular heat sink, the heat dissipation surface is the same, but the height is reduced, and the temperature rise of the IGBT under the maximum load operation at an ambient temperature of 43 degrees Celsius is less than 95 degrees.

In addition, the compressor driving circuit 130 may further include a comparator U8-A and a comparator U8-B. The non-inverting input terminal of the comparator U8-A is connected to the common terminal of the resistor RS1 and the three-way single-phase driving circuit through a resistor. The comparator U8 The inverting input terminal of -A is grounded through a resistor, the inverting input terminal of the comparator U8-B is connected to the common terminal of the resistor RS1 and the three-way single-phase driving circuit through a resistor, and the non-inverting input terminal of the comparator U8-B is grounded through a resistor. The output terminals of the comparator U8-A and the comparator U8-B are connected to the main controller IC8 through resistors. Among them, the comparator U8-A and the comparator U8-B can use the BU7262SF chip, and the comparator U8-A and the comparator U8-B are used to collect the driving voltage of the three-way single-phase driving circuit and feed it back to the main controller IC8 to realize the main The feedback adjustment of the controller IC8 to the three-way single-phase driving circuit makes the driving of the compressor 210 more accurate.

In order to facilitate a better understanding of the above-mentioned main-transformer integrated board, detailed explanations are given below with reference to specific embodiments.

The traditional refrigerator controller installation box is placed on the top of the refrigerator U-shell, which brings about the problems of higher installation box cover and poor aesthetic appearance. Based on this, in order to solve the problem of the height of the installation box in the prior art, a main-transformer integrated board with a reduced height is provided. In order to reduce the height requirements of the main-transformer integrated board, two 120uF/450V electrolytic capacitors with reduced height were used to replace a common 220uF/450V electrolytic capacitor, and the heat sink design of the IGBT was optimized to solve the problem of the height of the controller installation box. The height of the main-transformer integrated board can be reduced, thereby reducing the height of the controller installation box, increasing the effective volume of the refrigerator, and beautifying the appearance. The main-transformer integrated board may specifically be a PCB (Printed Circuit Board, printed circuit board) board.

Specifically, by using a controller installation box that is not embedded in the box and fixed on the top of the U shell of the refrigerator, the main transformer integrated board is fixed on the studs of the controller installation box. The main-transformer integrated board realizes the control of the refrigerator on a PCB board by integrating filter circuit, switching power supply circuit, refrigerator load control circuit, communication circuit, compressor drive circuit, etc. The size of the PCB board is 140*180.

Figure 3 is a schematic diagram of the power supply part of the main-transformer integrated board, including higher components: large electrolytic capacitors CE1 and CE6, common mode choke coil L2 and transformer T1. The main function is to provide isolated 12V, 1.2A power supply for the refrigerator controller, and non-isolated 15V, 0.15A power supply. After the 12V voltage output, the LD1117 chip stabilizes the output voltage of 15V and 0.2A, and after 15V, the LD1117 chip stabilizes the output voltage of 5V and 0.2A.

Figure 5 is a schematic diagram of the frequency conversion part of the main-transformer integrated board, which includes higher components: IGBT devices IG1 to IG6 and heat sinks. The main function is to provide frequency conversion drive for refrigerator compressors.

Select electrolytic capacitors CE1 and CE6 with a height of 20mm and a capacity of 120uF/450V to replace the general 220uF/450V electrolytic capacitors. Optimize layout and routing to reduce the height of the PCB board. Compared with the original one electrolytic capacitor, the heat dissipation area of the two electrolytic capacitors is larger, the operating temperature rise is reduced, the capacity is increased, and the service life of the electrolytic capacitor is prolonged.

Choose L-shaped IGBT heat sinks with a height of 20mm (placed at the back of IGBT devices IG1~IG6). Compared with general rectangular heat sinks, the heat dissipation surface is the same, and the height is reduced, which meets the maximum load operating temperature of IGBTs at an ambient temperature of 43 degrees Celsius. The rise is less than 95 degrees.

The horizontal EE20 transformer T1 with a height of 19mm is selected to reduce the height of the PCB board. The temperature rise of the transformer is less than 85 degrees when the maximum load is running at an ambient temperature of 43 degrees Celsius.

The CLJ-UU11016 common mode choke coil L2 with a fixed frame height of 20mm is selected to reduce the height of the PCB board, and the EMC test meets the requirements of the national standard and leaves a margin.

In one embodiment, a refrigerator is also provided, including the above-mentioned main-transformation integrated board. Further, the refrigerator also includes an installation box, the main transformer integrated board is arranged in the installation box, and the distance between the cover of the installation box and the upper surface of the live parts on the main transformer integrated board is greater than or equal to 8 mm. The distance between the cover of the installation box and the upper surface of the live parts such as electrolytic capacitors on the PCB board is greater than 8mm, which meets the requirements of electrical safety design and leaves a margin.

The above refrigerator, the main transformer integrated board integrates the switching power supply circuit, the refrigerator load control circuit and the compressor drive circuit to control the refrigerator, and the height of each electronic component in the control circuit is less than or equal to 20 mm, effectively reducing the main transformer integration. The thickness of the board enables the height of the installation box for placing the main transformer integrated board to be reduced, which provides the effective volume of the refrigerator compared with the traditional refrigerator controller.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present application, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the appended claims.

Claims (10)

1. A main-transformer integrated board for a refrigerator, characterized in that it comprises a base plate and a control circuit arranged on the base plate, The control circuit includes a switching power supply circuit, a refrigerator load control circuit and a compressor drive circuit, the refrigerator load control circuit is connected to the switching power supply circuit and the compressor drive circuit, and the compressor drive circuit is used to connect the refrigerator. For the compressor, the height of each electronic component in the control circuit is less than or equal to 20 mm. 2. The main-transformer integrated board according to claim 1, wherein the switching power supply circuit comprises a common mode choke coil, a rectifier bridge, a transformer, an output circuit, a feedback circuit and a power supply control circuit, and the common mode choke The flow coil is connected to the primary winding of the transformer through the rectifier bridge, the output circuit is connected to the secondary winding of the transformer, the refrigerator load control circuit and the compressor drive circuit, and the feedback circuit is connected to the output A circuit and the power control circuit connected to the primary winding of the transformer. 3. The main-transformer integrated board according to claim 2, wherein the switching power supply circuit further comprises an electrolytic capacitor CE1 and an electrolytic capacitor CE6, and the input side of the rectifier bridge is connected to the common mode choke coil, so the The output side of the rectifier bridge is connected to the primary winding of the transformer, and both the electrolytic capacitor CE1 and the electrolytic capacitor CE6 are connected in parallel to the output side of the rectifier bridge. 4. The main-transformer integrated board according to claim 3, wherein the common mode choke is a CLJ-UU11016 type common mode choke with a height of 20 mm, and the transformer is a horizontal EE20 type 19 mm The height of the transformer, the electrolytic capacitor CE1 and the electrolytic capacitor CE6 are both electrolytic capacitors with a height of 20 mm and a capacity of 120uF/450V. 5. The main-transformer integrated board according to claim 1, wherein the compressor drive circuit comprises a three-way single-phase drive circuit, and the three-way single-phase drive circuit is connected to the switching power supply circuit and the Refrigerator load control circuit, and is used to connect the compressor of the refrigerator. 6 . The main-transformer integrated board according to claim 5 , wherein each single-phase drive circuit includes a drive chip, a switch tube assembly and a heat sink, and the drive chip connects the switching power supply circuit and the refrigerator. 7 . In the load control circuit, the switch tube assembly is connected to the drive chip, and is also used to connect to the compressor of the refrigerator, and the heat sink is arranged corresponding to the switch tube assembly. 7 . The main-transformer integrated board according to claim 6 , wherein the heat sink is an L-shaped IGBT heat sink with a height of 20 mm. 8 . 8 . The main-transformer integrated board according to claim 1 , wherein the control circuit further comprises a communication circuit connected to the refrigerator load control circuit. 9 . 9. A refrigerator, characterized in that it comprises the main-transformation integrated board according to any one of claims 1-8. 10 . The refrigerator according to claim 9 , further comprising an installation box, the main transformer integrated board is arranged in the installation box, and the cover of the installation box is connected to the main transformer integrated board. 11 . The distance between the upper surfaces of the live parts is greater than or equal to 8 mm.

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