CN211476464U

CN211476464U - Refrigerator and main become intergral template thereof

Info

Publication number: CN211476464U
Application number: CN201922324756.2U
Authority: CN
Inventors: 唐华俊; 王咸鑫; 方茂长
Original assignee: Gree Electric Appliances Inc of Zhuhai; Hefei Kinghome Electrical Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Hefei Kinghome Electrical Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-09-11
Anticipated expiration: 2029-12-20

Abstract

The utility model relates to a refrigerator and main integrative board that becomes thereof, main integrative board that becomes includes the base plate and sets up in the control circuit of base plate, and control circuit includes switching power supply circuit, refrigerator load control circuit and compressor drive circuit, and refrigerator load control circuit connects switching power supply circuit and compressor drive circuit, and compressor drive circuit is used for connecting the compressor of refrigerator, and each electronic component's among the control circuit highly is less than or equal to 20 millimeters. The switch power supply circuit, the refrigerator load control circuit and the compressor driving circuit are integrated together to control the refrigerator, the height of each electronic element in the control circuit is less than or equal to 20 millimeters, the thickness of the main transformer integrated plate is effectively reduced, the height of a mounting box for placing the main transformer integrated plate can be reduced, and compared with a traditional refrigerator controller, the refrigerator controller provides the effective volume of the refrigerator.

Description

Refrigerator and main become intergral template thereof

Technical Field

The application relates to the technical field of intelligent electrical equipment, in particular to a refrigerator and a main transformer integrated plate thereof.

Background

The control panel of the frequency conversion refrigerator is generally controlled by three display panels of a main control panel and a frequency conversion panel. Along with the maturity of refrigerator compressor frequency conversion technology, the diversification of frequency conversion drive scheme, and to the control demand of cost, the main transformer all-in-one board scheme that integrates main control board and frequency conversion drive board together uses more and more popularizing on the refrigerator. The main transformer integrated board comprises a power circuit, an EMI (Electromagnetic Interference) filter circuit, an IGBT drive compressor circuit and the like, the integration level is high, a plurality of power devices are used, and special requirements are imposed on a refrigerator controller mounting box.

Traditional refrigerator is pre-buried at the foaming in situ or put at the top of refrigerator U shell with the mounting box usually, and the mounting box is pre-buried can require the thickness design on foaming layer enough thick in the foaming in situ, prevents condensation on the control panel, but the foaming layer of excessive thickness can bring the volumetric reduction of refrigerator, and the mounting box is put and also can be brought the problem that the installation lid becomes high at the top of refrigerator U shell, and traditional refrigerator controller has reduced the effective volume of refrigerator.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a refrigerator and a main transformer integrated board thereof, which can improve the effective volume of the refrigerator, aiming at the problem that the effective volume of the refrigerator is reduced by the traditional refrigerator controller.

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

the control circuit comprises a switching power supply circuit, a refrigerator load control circuit and a compressor driving circuit, the refrigerator load control circuit is connected with the switching power supply circuit and the compressor driving circuit, the compressor driving circuit is used for being connected with a compressor of a refrigerator, and the height of each electronic element in the control circuit is smaller than or equal to 20 millimeters.

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, the common mode choke coil is connected to a primary winding of the transformer through the rectifier bridge, the output circuit is connected to a 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, and the power supply 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, the output side of the rectifier bridge is connected to the primary winding of the transformer, and 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 the height of 20mm, the transformer is a horizontal EE20 type transformer with the height of 19mm, and the electrolytic capacitor CE1 and the electrolytic capacitor CE6 are both 20 mm-height electrolytic capacitors with the capacity of 120 uF/450V.

In one embodiment, the compressor driving circuit comprises three single-phase driving circuits which are connected with the switching power supply circuit and the refrigerator load control circuit and are used for connecting a compressor of a refrigerator.

In one embodiment, each single-phase driving circuit comprises a driving chip, a switching tube assembly and a radiating fin, wherein the driving chip is connected with the switching power supply circuit and the refrigerator load control circuit, the switching tube assembly is connected with the driving chip and is also used for being connected with a compressor of a refrigerator, and the radiating fin is arranged corresponding to the switching tube assembly.

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

In one embodiment, the control circuit further comprises a communication circuit connected with the refrigerator load control circuit.

A refrigerator comprises the main transformer integrated plate.

In one embodiment, the refrigerator further comprises a mounting box, the main transformer integrated plate is arranged in the mounting box, and the distance between a box cover of the mounting box and the upper surface of an electrified part on the main transformer integrated plate is greater than or equal to 8 mm.

Above-mentioned refrigerator and owner become intergral template, with switching power supply circuit, refrigerator load control circuit and compressor drive circuit integration together realization to the control of refrigerator, each electronic component's among the control circuit highly is less than or equal to 20 millimeters in addition, effectively reduces owner and becomes the intergral template thickness for the height of the mounting box that is used for placing owner and becomes the intergral template can reduce, compares with traditional refrigerator controller, provides the effective volume of refrigerator.

Drawings

FIG. 1 is a block diagram of a control circuit of a master integrated circuit board according to an embodiment;

FIG. 2 is a block diagram of a control circuit of a master transformer integrated board according to another embodiment;

FIG. 3 is a schematic diagram of a switching power supply circuit according to an embodiment;

FIG. 4 is a schematic diagram of a load control circuit of a refrigerator according to an embodiment;

FIG. 5 is a schematic diagram of a compressor drive circuit according to an embodiment;

FIG. 6 is a schematic diagram of the U-phase driving circuit shown in FIG. 5;

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

fig. 8 is a schematic diagram of the W-phase driving circuit in fig. 5.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In one embodiment, a main transformer integrated board of a refrigerator is provided, which comprises a substrate and a control circuit arranged on the substrate. As shown in fig. 1, the control circuit includes a switching power supply circuit 110, a refrigerator load control circuit 120 and a compressor driving circuit 130, the refrigerator load control circuit 120 is connected with the switching power supply circuit 110 and the compressor driving circuit 130, the compressor driving circuit 130 is used for connecting a compressor 210 of the refrigerator, and 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 further connected to the compressor driving circuit 130, and is used for connecting an external power supply to process and then supplying power to the refrigerator load control circuit 120 and the compressor driving circuit 130. The refrigerator load control circuit 120 may control the compressor driving circuit 130 to drive and control the compressor 210 according to parameters detected by internal sensors of the refrigerator or in combination with control instructions sent by a user through an interactive interface of the refrigerator. Different electronic components such as resistance, electric capacity, switch tube can specifically be included among the control circuit, screens through electronic components's among the control circuit specification, and each electronic components' of control highly is less than or equal to 20 millimeters to reduce the main integrative plate thickness that becomes, make the installation become the height of the mounting box of integrative board and can design littleer, thereby reduce the mounting box place space, improve the effective volume of 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 devices of the refrigerator through the communication circuit 140, or may receive a control command sent by a user through the communication circuit 140 to perform driving control on the compressor 210.

According to the main transformer integrated plate of the refrigerator, the switching power supply circuit 110, the refrigerator load control circuit 120 and the compressor driving circuit 130 are integrated together to control the refrigerator, and the height of each electronic element in the control circuit is smaller than or equal to 20mm, so that the thickness of the main transformer integrated plate is effectively reduced, the height of a mounting box for placing the main transformer integrated plate can be reduced, and compared with a traditional refrigerator controller, the effective volume of the refrigerator is provided.

The specific structure of the switching power supply circuit 110 is not exclusive, and in one embodiment, as shown in fig. 3, the switching power supply circuit 110 includes a common mode choke L2, a rectifier bridge BR, a transformer T1, an output circuit 112, a feedback circuit 114, and a power supply control circuit 116, the common mode choke 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, the feedback circuit 114 is connected to the output circuit 112 and the power supply control circuit 116, and the power supply control circuit 116 is connected to the primary winding of the transformer T1.

The external commercial power is transmitted to the rectifier bridge BR for rectification through the common mode choke coil L2, and the obtained direct current is transmitted to the primary winding of the transformer T1, and the output circuit 112 supplies power to the refrigerator load control circuit 120 and the compressor driving circuit 130 according to the voltage generated by the secondary winding of the transformer T1. The feedback circuit 114 detects the voltage transmitted by the output circuit 112 and feeds the detected voltage back to the power control circuit 116, and the power control circuit 116 controls the on/off of the loop of the primary winding of the transformer T1 according to the feedback voltage, so as to maintain the voltage output by 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 L2, the output side of the rectifier bridge BR is connected to the primary winding of the transformer T1, and the electrolytic capacitor CE1 and the electrolytic capacitor CE6 are both connected in parallel to the output side of the rectifier bridge BR.

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

Specifically, the primary winding of the transformer T1 includes two windings, one input end of the common mode choke L2 is connected to the live line L, the other input end is connected to the neutral line N, two output ends of the common mode choke L2 are respectively connected to the port 2 and the port 3 on the input side of the rectifier bridge BR, in the primary winding of the transformer T1, the port 5 of one winding is connected to the port 1 on the output side of the rectifier bridge BR, the port 4 of the winding is connected to the power control circuit 116, the port 1 of the other winding is connected to the feedback circuit 114, and the port 2 of the winding is grounded. The common mode choke coil L2 can be a common mode choke coil of CH-305-01516 mH, the rectifier bridge BR can be a rectifier bridge of GBU8K type, and the transformer T1 can be a transformer of EE20-29 type. In addition, the switching power supply circuit 110 may further include a fuse F1, a voltage dependent resistor RV1, a thermistor NTC1, and other electronic components such as resistors, capacitors, diodes, and voltage regulators, and the specific structure is shown in fig. 3 and will not be described herein again.

Further, the output circuit 112 includes a capacitor CE2, an inductor L1, a regulator chip U4, and a regulator chip U9. The voltage regulation chip U4 and the voltage regulation chip U9 may both be LD1117 chips. The voltage output by the secondary winding of the transformer T1 passes through the capacitor CE2 and the inductor L1 and then outputs + 12V, the + 12V voltage passes through one LD1117 chip to stabilize and output 15V voltage, and the 15V voltage passes through the other LD1117 chip to stabilize and output 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 a resistor, a capacitor, a diode, and other devices, as shown in fig. 3, which is not described herein again.

With continued reference to fig. 3, the feedback circuit 114 may include an optocoupler U2, a voltage reference chip U1, and a two-way sampling circuit, where one sampling circuit includes a resistor R2 and a resistor R7, and the other sampling circuit includes a resistor R9 and a resistor R10. The resistor R2 and the resistor R7 are connected in series, the common end of the resistor R3578 is connected with the input end of a light emitting tube of the optocoupler U2, the other end of the resistor R7 is connected with one end of the inductor L1 close to the transformer T1, and the other end of the resistor R2 is connected with the output end of the light emitting tube of the optocoupler U2. The resistor R9 and the resistor R0 are connected in series, a common tube is connected with a control end of the voltage reference chip U1, an input end of the voltage reference chip U1 is connected with an output end of a light emitting tube of the optocoupler U2, and an output end of the voltage reference chip U1 is grounded. The other end of the resistor R9 is connected with one end of the inductor L1 far away from the transformer T1, and the other end of the resistor R10 is grounded. The input end of a receiving tube of the optocoupler U2 is connected with a port 1 of a winding of the transformer T1 through a corresponding resistor, and the output end of the receiving tube of the optocoupler U2 is connected with the power control circuit 116. In addition, the feedback circuit 114 includes other resistance, capacitance, and the like.

Specifically, the optical coupler U2 may specifically adopt an LTV-816S optical coupler, and the voltage reference chip U1 may adopt a CJ431 chip. 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 a corresponding feedback signal to the power control circuit 116, so as to perform voltage output control on the power control circuit 116, and implement isolated transmission of signals, thereby improving 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, the control chip IC1 connecting the primary winding of the transformer T1 and the feedback circuit 114. The control chip IC1 may specifically adopt a TOP264 chip, and the power control circuit 116 may further include components such as a resistor, a capacitor, a diode, and a voltage regulator tube.

In one embodiment, as shown in fig. 4, the refrigerator load control circuit 120 includes a main controller IC8 and a peripheral circuit, and a main controller IC8 connects the switching power supply circuit 110 and the compressor driving circuit 130 through the peripheral circuit. The master IC8 may adopt an S6E1a12B0A chip, and the peripheral circuits may include a crystal resonator X2 and an indicator LED1 connected to the master IC 8. In addition, the peripheral circuit may further include elements such as resistors, capacitors, and diodes.

In one embodiment, as shown in fig. 5, the compressor drive circuit 130 includes three single phase drive circuits each connecting the switching power supply circuit 110 and the refrigerator load control circuit 120 and configured to connect to the compressor 210 of the refrigerator. For convenience of description, the three 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 an interface CN 20. It is understood that the compressor driving circuit 130 may further include other resistors, capacitors, diodes, and other elements, and details are not described herein with reference to fig. 5.

In one embodiment, each single-phase driving circuit comprises a driving chip, a switching tube assembly and a heat sink, the driving chip is connected with the switching power supply circuit 110 and the refrigerator load control circuit 120, the switching tube assembly is connected with the driving chip and is also used for being connected with the compressor 210 of the refrigerator, and the heat sink is arranged corresponding to the switching tube assembly.

Specifically, fig. 6 to 8 are schematic structural diagrams of a U-phase driving circuit 132, a V-phase driving circuit 134, and a W-phase driving circuit 136, respectively, where the U-phase driving circuit 132 includes a driving chip U5, and a switching tube assembly composed of a switching tube IG1 and a switching tube IG 4. The V-phase driving circuit 134 includes a driving chip U6, and a switching tube assembly composed of a switching tube IG2 and a switching tube IG 5. The W-phase driving circuit 136 includes a driving chip U7, and a switching tube assembly composed of a switching tube IG3 and a switching tube IG 6. The driving chip U5, the driving chip U6 and the driving chip U7 can all adopt L6388 chips, and the switching tube IG1, the switching tube IG4, the switching tube IG2, the switching tube IG5, the switching tube IG3 and the switching tube IG6 can all adopt STGF4M65DF2 type triodes. In addition, the three-way single-phase driving circuit can also comprise elements such as a resistor, a capacitor, a diode and the like.

Taking the U-phase driving circuit 132 as an example, as shown in fig. 6, the driving chip U5 is connected to the master controller IC8 in the refrigerator load control circuit 120, and is further connected to the control ends of the switching tube IG1 and the switching tube IG4, the input end of the switching tube IG1 is connected to the power supply input end P, the output end of the switching tube IG1 is connected to the input end of the switching tube IG4 and the U-phase end of the compressor 210, and the output end of the switching tube IG4 is grounded through the resistor RS 1. Heat is radiated by the heat radiating fins provided at the positions of the switching tube IG1 and the switching tube IG 4. The heat sink may be driven by the master IC8 for heat dissipation or may be driven by an external control circuit for heat dissipation. The structures of the V-phase drive circuit 134 and the W-phase drive circuit 136 are similar to those of the U-phase drive circuit 132, and are not described in detail here.

Specifically, in one embodiment, the heat sink is a 20 millimeter height, L-shaped IGBT heat sink. The IGBT radiating fin with the height of 20mm and the L shape is selected, compared with a universal rectangular radiating fin, the radiating surface is the same, the height is reduced, and the temperature rise of the IGBT which runs under the maximum load at the ring temperature of 43 ℃ is less than 95 ℃.

In addition, the compressor driving circuit 130 can further comprise a comparator U8-A and a comparator U8-B, wherein the non-inverting input end of the comparator U8-A is connected with the common end of the three-way single-phase driving circuit through a resistor RS1, the inverting input end of the comparator U8-A is grounded through a resistor, the inverting input end of the comparator U8-B is connected with the common end of the three-way single-phase driving circuit through a resistor RS1, the non-inverting input end of the comparator U8-B is grounded through a resistor, and the output ends of the comparator U8-A and the comparator U8-B are both connected with the master IC8 through resistors. The comparator U8-A and the comparator U8-B can adopt BU7262SF chips, the comparator U8-A and the comparator U8-B are used for collecting the driving voltage of the three-way single-phase driving circuit and feeding the driving voltage back to the master controller IC8, feedback regulation of the master controller IC8 on the three-way single-phase driving circuit is achieved, and driving of the compressor 210 is more accurate.

In order to better understand the above-mentioned integrated main transformer plate, the following detailed explanation is made with reference to specific embodiments.

The traditional refrigerator controller mounting box is placed at the top of a U shell of a refrigerator, so that the problems that a mounting box cover is high in height and the appearance is poor in aesthetic quality are caused. Based on this, for having the mounting box height problem among the solution prior art, provide a main integrative board that becomes of reduction height. Aiming at reducing the height requirement of the main transformer integrated plate, two 120uF/450V electrolytic capacitors with reduced height are used for replacing a universal 220uF/450V electrolytic capacitor, the heat dissipation sheet design of the IGBT is optimized, and the problem of the height of the controller mounting box is solved. The height of the main transformer integrated plate can be reduced, so that the height of the controller mounting box is reduced, the effective volume of the refrigerator is improved, and the appearance is beautified. The main integrated Circuit Board may be a Printed Circuit Board (PCB) Board.

Specifically, the main transformer integrated plate is fixed on a stud of the controller mounting box by using the controller mounting box which is not embedded in the box body and is fixed to the top of the U shell of the refrigerator. The main transformer integrated board realizes the control of the refrigerator on a PCB board through an integrated filter circuit, a switching power supply circuit, a refrigerator load control circuit, a communication circuit, a compressor driving circuit and the like, and the size of the PCB board is 140 x 180.

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

Fig. 5 is a schematic diagram of a frequency conversion portion of the main transformer integrated board, which includes higher components: IGBT devices IG 1-IG 6 and radiating fins mainly have the function of providing variable-frequency drive for the refrigerator compressor.

The electrolytic capacitors CE1 and CE6 with the height of 20mm and the capacity of 120uF/450V are selected to replace the common electrolytic capacitor of 220 uF/450V. The layout and the wiring are optimized, and the height of the PCB is reduced. Compared with the original electrolytic capacitor, the two electrolytic capacitors have larger heat dissipation area, lower operation temperature rise, larger capacity and longer service life.

The IGBT radiating fins (arranged at the rear parts of IG 1-IG 6) with the height of 20mm and L shapes are selected, compared with the universal rectangular radiating fins, the radiating surfaces are the same, the height is reduced, and the temperature rise of the IGBT which runs under the maximum load at the ring temperature of 43 ℃ is less than 95 ℃.

A horizontal EE20 type transformer T1 with the height of 19mm is selected, the height of the PCB is reduced, and the temperature rise of the transformer is less than 85 ℃ when the transformer is operated under the maximum load at the ring temperature of 43 ℃ in experimental tests.

A CLJ-UU11016 common mode choke coil L2 with a fixed frame height of 20mm is selected to reduce the height of the PCB, and an EMC experiment meets the national standard requirement and leaves a margin.

In one embodiment, a refrigerator is also provided, and the refrigerator comprises the main transformer integrated plate. Further, the refrigerator also comprises a mounting box, the main transformer integrated plate is arranged in the mounting box, and the distance between a box cover of the mounting box and the upper surface of the electrified part on the main transformer integrated plate is larger than or equal to 8 millimeters. The distance between the box cover of the mounting box and the upper surface of an electrified part such as an electrolytic capacitor on the PCB is more than 8mm, the electrical safety design requirement is met, and allowance is reserved.

Above-mentioned refrigerator, the integrated board of main transformer realizes the control to the refrigerator with switching power supply circuit, refrigerator load control circuit and compressor drive circuit integration together, and each electronic component's among the control circuit highly is less than or equal to 20 millimeters in addition, effectively reduces the thickness of the integrated board of main transformer for the height that is used for placing the mounting box of the integrated board of main transformer can reduce, compares with traditional refrigerator controller, provides the effective volume of refrigerator.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A main transformer integrated board of a refrigerator is characterized by comprising a base board and a control circuit arranged on the base board,

2. The main transformer integrated board according to claim 1, wherein 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, the common mode choke coil is connected to a primary winding of the transformer through the rectifier bridge, the output circuit is connected to a 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, and the power supply control circuit is 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, the input side of the rectifier bridge is connected to the common mode choke, the output side of the rectifier bridge is connected to the primary winding of the transformer, and 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 coil is a CLJ-UU11016 type common mode choke coil with a height of 20mm, the transformer is a horizontal EE20 type transformer with a height of 19mm, and the electrolytic capacitor CE1 and the electrolytic capacitor CE6 are both 20mm high electrolytic capacitors with a capacity of 120 uF/450V.

5. The primary transformer integrated board of claim 1, wherein the compressor drive circuit comprises a three-way single phase drive circuit, the three-way single phase drive circuit connecting the switching power supply circuit and the refrigerator load control circuit and configured to connect to a compressor of a refrigerator.

6. The main transformer integrated board as claimed in claim 5, wherein each single-phase driving circuit comprises a driving chip, a switching tube assembly and a heat sink, the driving chip is connected to the switching power supply circuit and the refrigerator load control circuit, the switching tube assembly is connected to the driving chip and is further used for being connected to a compressor of a refrigerator, and the heat sink is arranged corresponding to the switching tube assembly.

7. The primary transformer integrated board of claim 6, wherein the fins are 20mm height, L-shaped IGBT fins.

8. The primary transformer integrated board of any one of claims 1-7, wherein the control circuit further comprises a communication circuit connected to the refrigerator load control circuit.

9. A refrigerator comprising the main transformer integrated board as claimed in any one of claims 1 to 8.

10. The refrigerator according to claim 9, further comprising a mounting box, wherein the main transformer integrated plate is disposed in the mounting box, and a distance between a box cover of the mounting box and an upper surface of a live part on the main transformer integrated plate is greater than or equal to 8 mm.