Refrigeration equipment and control device of refrigeration equipment

Abstract

The utility model provides refrigeration equipment and a control device of the refrigeration equipment, and belongs to the field of refrigeration control, the control device comprises a power supply circuit, a master control MCU, a compressor control circuit, at least one fan control circuit and a serial port time-sharing communication circuit which are arranged on a printed circuit board, the power supply circuit supplies power to the main control MCU, the compressor control circuit and the at least one fan control circuit; the compressor control circuit comprises a compressor MCU used for controlling a compressor and a first inverter circuit used for driving the compressor. The fan control circuit comprises a fan MCU (Microprogrammed Control Unit) for controlling a fan and a second inverter circuit for driving the fan; and the serial port time-sharing communication circuit is used for establishing time-sharing communication connection among the main control MCU, the compressor MCU and the fan MCU. According to the control device provided by the invention, the wiring complexity and cost can be reduced, and the anti-interference capability is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of refrigeration control, and in particular to a refrigeration device and a control device of the refrigeration device. BACKGROUND

[0002] In a refrigeration device such as a commercial refrigerator, a compressor, a condenser fan and an evaporator fan are main energy-consuming components. In order to achieve energy saving, a variable frequency compressor is generally used in a modern refrigerator. In a related scheme, a decentralized control architecture is usually used, that is, one main temperature controller is responsible for collecting temperature signals and making decisions, and then sends instructions to independent variable frequency compressor controllers, condenser fan controllers and evaporator fan controllers.

[0003] In this decentralized architecture, each independent controller needs a separate power input and an electromagnetic compatibility (EMC) filter circuit. Multiple power supply lines are connected in parallel to the refrigeration device, which not only increases the wiring complexity and cost, but also worsens the EMC performance of the whole machine, making it very difficult to suppress electromagnetic interference and poor in anti-interference ability. UTILITY MODEL CONTENT

[0004] The present disclosure provides a refrigeration device and a control device of the refrigeration device, which can reduce the complexity and cost of wiring and improve the anti-interference ability.

[0005] The technical solution of the present disclosure is implemented as follows:

[0006] In a first aspect, the present disclosure provides a control device of a refrigeration device, comprising a power supply circuit, a main control MCU, a compressor control circuit, at least one fan control circuit and a serial time-sharing communication circuit arranged on a printed circuit board, wherein

[0007] The power supply circuit is used to rectify alternating current into direct current to supply power to the main control MCU, the compressor control circuit and the at least one fan control circuit;

[0008] The compressor control circuit comprises a compressor MCU for controlling the compressor and a first inverter circuit for driving the compressor;

[0009] The at least one fan control circuit comprises a fan MCU for controlling the fan and a second inverter circuit for driving the fan;

[0010] The serial time-sharing communication circuit is used to establish a time-sharing communication connection between the main control MCU and the compressor MCU and the fan MCU.

[0011] In a second aspect, the present disclosure provides a refrigeration device comprising a compressor and a fan, and further comprising the control device of the refrigeration device as described in the first aspect.

[0012] The present disclosure provides a refrigerating appliance and a control device of a refrigerating appliance, wherein only one external AC power supply is provided for the control circuit, the number of power supply lines is reduced, and the power supply filtering and rectification of the control circuit is also completed by the power supply circuit, the grounding and filtering design is optimized, the conducted disturbance is effectively suppressed, and the anti-interference ability is improved. In addition, the control circuits are all arranged on the same printed circuit board, which not only simplifies the wiring, but also reduces the manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A schematic diagram of the refrigerating appliance provided by the present disclosure.

[0014] Figure 2 A schematic diagram of the control device of the refrigerating appliance provided by the present disclosure.

[0015] Figure 3 A schematic diagram of the power supply circuit provided by the present disclosure.

[0016] Figure 4 A schematic diagram of the fan control circuit provided by the present disclosure.

[0017] Figure 5 A schematic diagram of the first fan control circuit provided by the present disclosure.

[0018] Figure 6 An implementation schematic diagram of the serial port time-sharing communication circuit provided by the present disclosure. DETAILED DESCRIPTION

[0019] The technical solutions in the present disclosure will be described clearly and completely below in combination with the drawings in the present disclosure.

[0020] Figure 1 A schematic diagram of an exemplary refrigerating appliance 100 provided by the present disclosure, the refrigerating appliance 100 involved in the present disclosure can be a refrigerator, a freezer, or the like, which can store articles in a refrigeration or freezing state. In the present disclosure, the refrigerating appliance 100 includes a main body 110 having a front opening, a compartment 120 capable of storing articles formed in the main body 110, a door 130 for opening or closing the front opening of the main body 110, and a refrigeration system 140 for cooling the temperature in the compartment 120. Figure 1

[0021] The main body 110 defines the appearance of the refrigerating appliance 100. Exemplarily, the main body 110 includes an inner casing 112 for forming the compartment and an outer casing 114 coupled to the outside of the inner casing 112. A heat insulating material is filled between the inner casing 112 and the outer casing 114 to prevent the cold air from leaking from the compartment 120.

[0022] ​Exemplarily, the intermediate chamber 120 can be implemented as a refrigerating chamber to store items in a refrigerating state, or as a freezing chamber to store items in a freezing state.

[0023] The intermediate chamber 120 can be opened or closed by the door 130. After the door 130 is closed, when the temperature inside the intermediate chamber 120 is higher than the temperature interval corresponding to the refrigerating state or the freezing state, the refrigeration system 140 will be started to reduce the temperature inside the intermediate chamber 120.

[0024] In Figure 1 The refrigeration system 140 includes a compressor 142, a condenser 144, an expansion valve 146, and an evaporator 148. Specifically, the compressor 142 and the condenser 144 can be arranged in a mechanical chamber (not shown) at the lower rear of the main body 110. The expansion valve 146 and the evaporator 148 can be disposed in a pipe (not shown) of the internal space of the main body 110. Figure 1 The refrigeration system 140 includes a compressor 142, a condenser 144, an expansion valve 146, and an evaporator 148. Specifically, the compressor 142 and the condenser 144 can be arranged in a mechanical chamber (not shown) at the lower rear of the main body 110. The expansion valve 146 and the evaporator 148 can be disposed in a pipe (not shown) of the internal space of the main body 110. Figure 1

[0025] Exemplarily, in combination with the components included in the above refrigeration system 140, the refrigeration system 140 operates in the following manner in the process of reducing the temperature inside the intermediate chamber 120 to the temperature interval corresponding to the refrigerating state or the freezing state (i.e., the refrigeration process):

[0026] First, the compressor 142 compresses the low-pressure gas-phase refrigerant to form high-pressure gas-phase refrigerant, and transmits the high-pressure gas-phase refrigerant to the condenser 144 at high pressure through the refrigerant pipe 135.

[0027] Subsequently, the high-pressure gas-phase refrigerant is condensed into high-pressure liquid-phase refrigerant by the condenser 144, and in this condensation process, the refrigerant releases latent heat. In some examples, the condenser 144 will be heated by the latent heat released from the refrigerant, and therefore, a condenser fan 143 can be provided to discharge the released latent heat to the external environment of the refrigeration device 100 to cool the condenser 144.

[0028] Then, the expansion valve 146 depressurizes the high-pressure liquid-phase refrigerant, and the expansion valve 146 can also adjust the amount of refrigerant so that the refrigerant can absorb sufficient heat energy from the evaporator 148.

[0029] Finally, the evaporator 148 evaporates the depressurized liquid-phase refrigerant, and in the evaporation process, the refrigerant absorbs latent heat from the evaporator 148 to cool the air around the evaporator 148. In some examples, the refrigeration device 100 also includes an evaporator fan 149 that flows the air cooled by the evaporator 148 into the intermediate chamber 120 through the air outlet 170 to reduce the temperature inside the intermediate chamber 120, and returns the flowing air to the surroundings of the evaporator 148 through the air return 180. ​

[0030] The low pressure gas phase refrigerant after evaporation will return to the compressor 142, thereby repeating the above refrigeration cycle process. In some examples, the pressure generated by the compressor 142 causes the refrigerant to circulate within the refrigerant conduit 135 along the condenser 144, the expansion valve 146, and the evaporator 148.

[0031] In Figure 1 In the refrigeration device 100 shown, the working states of the compressor 142, the condenser fan 143, and the evaporator fan 149 are controlled by setting a control device. Figure 2 The control device 200 of the refrigeration device provided in the present disclosure is shown in the composition diagram.

[0032] In Figure 2 The control device 200 can include a power supply circuit 220, a master control microcontroller unit (MCU) 230, a compressor control circuit 240, at least one fan control circuit 250, and a serial time-sharing communication circuit 260, which are arranged on a printed circuit board 210. Among them,

[0033] The power supply circuit 220 is used to rectify the external alternating current (for example, 220V mains) into direct current, and provide direct current voltage to the master MCU 230, the compressor control circuit 240, and the at least one fan control circuit 250.

[0034] The master MCU 230 is responsible for the control logic of the compressor 142 and the fan in the control device 200. According to the preset refrigeration algorithm, it decides the target working frequency of the compressor 142 and the target rotating speed of the fan (such as the condenser fan and the evaporator fan), and sends control instructions to the compressor control circuit 240 and the fan control circuit 250 through the serial time-sharing communication circuit 260, to control the operation of the compressor 142 and the fan.

[0035] The compressor control circuit 240 includes a compressor MCU 242 for controlling the compressor 142 and a first inverter circuit 244 for driving the compressor. Specifically, the compressor MCU 242 is responsible for receiving instructions from the master MCU 230, and executing a motor control algorithm (such as field-oriented control) to generate a pulse width modulation (PWM) signal to control the first inverter circuit 244, so that the first inverter circuit 244 drives the compressor to operate at the target working frequency.

[0036] At least one fan control circuit 250, including a fan MCU 252 for controlling the fan and a second inverter circuit 254 for driving the fan. In the present disclosure, the fan includes the condensing fan 143 and the evaporating fan 149. The fan MCU 252 forms a control signal of the fan according to the instruction of the master MCU 230 by executing a preset fan control algorithm, so that the second inverter circuit 254 drives the fan to operate at a target rotating speed.

[0037] The serial time-sharing communication circuit 260 is used to establish a time-sharing communication connection between the master MCU 230 and the compressor MCU 242 and the fan MCU 252.

[0038] Figure 3 The structure schematic diagram of the power supply circuit 220 provided in the present disclosure. In the present disclosure, the power supply circuit 220 is designed as a layered multi-level power supply system. Referring to Figure 3 , the power supply circuit 220 includes a rectifier circuit 221 and an isolation circuit 222; wherein the rectifier circuit 221 is used to rectify the external alternating current into a first direct current with a voltage value of 310V; the isolation circuit 222 is used to reduce the voltage of the first direct current to 24V to obtain a second direct current; the first direct current is used to power the compressor, and the second direct current is used to power at least one fan control circuit 250 and the master MCU 230.

[0039] Specifically, the rectifier circuit 221 includes a two-stage EMC filter circuit 2211 and a rectifier bridge 2212. The two-stage EMC filter circuit 2211 is used to filter out high-frequency noise in the alternating current and suppress the electromagnetic interference generated by the control device itself from being conducted to the power grid. The filtered alternating current enters the rectifier bridge 2212 and is rectified into direct current, and then after large-capacity capacitor filtering, a stable first direct current of about 310V is formed. The first direct current is connected to the compressor 142 through a high-voltage direct current bus and serves as the input power of the compressor 142.

[0040] The first DC power is also sent to an isolation circuit 222. In the present disclosure, the isolation circuit 222 is a topology of an isolated flyback converter, which can safely reduce the high-voltage DC of 310V to a low-voltage DC, such as 24V, to form a second DC power with high efficiency and good electrical isolation performance. Through the isolation circuit 222, noise on the high-voltage side can be prevented from being coupled to the sensitive control circuit on the low-voltage side, ensuring the stable operation of the main control MCU 230 and the fan control circuit 250. The 24V second DC power will be used to power the main control MCU 230 and all fan control circuits. Specifically, the input end of the rectifier circuit 221 is connected to the external AC power, the output end of the rectifier circuit 221 is connected to the compressor 142 and the input end of the isolation circuit 222, and the output end of the isolation circuit 222 is used to power at least one fan control circuit and the main control MCU 230.

[0041] In the present disclosure, the power supply circuit 220 further includes a step-down circuit 223 for converting the second DC power into a third DC power with a voltage value of 15V and a fourth DC power with a voltage value of 5V, wherein the third DC power is used to power the first inverter circuit 244, and the fourth DC power is used to power the compressor MCU 242. Specifically, the step-down circuit 223 can generate a third DC power of 15V and a fourth DC power of 5V through a buck converter. Among them, the third DC power of 15V is used to power the power tube gate driver in the first inverter circuit 244, and the fourth DC power of 5V is used to power the compressor MCU 242 itself.

[0042] Through Figure 3 The layered power supply architecture shown in the present disclosure first reduces the voltage from 310V to 24V, and then reduces the voltage from 24V to 15V or 5V, which has a smaller voltage difference in the DC voltage reduction process, lower energy loss, and better stability compared to the power supply scheme in the related art that directly reduces the voltage from 310V to 15V. Under the condition of smaller voltage difference, the Buck converter used in the present disclosure has higher efficiency than the linear voltage regulator (LDO), which can significantly reduce the heat dissipation on the printed circuit board 210, thereby improving energy efficiency and reliability. In addition, since all control circuits and MCUs are powered by the power supply circuit 220, the present disclosure only needs to perform EMI filtering on a single AC input during implementation, which can effectively suppress electromagnetic interference of the entire control circuit. Compared with the related art scheme in which multiple independent controllers perform EMI filtering respectively, not only better EMC performance can be obtained, but also the cost of filtering components can be significantly saved.

[0043] Figure 4 and Figure 5The architecture schematic of the fan control circuit is shown. Referring to Figure 4 , the fan control circuit 250 includes a first fan control circuit 250-1 for controlling and driving the evaporative fan, and a second fan control circuit 250-2 for controlling and driving the condensing fan.

[0044] Correspondingly, the first fan control circuit 250-1 includes a first fan MCU 252-1 and a corresponding first fan inverter circuit 254-1. The second fan control circuit 250-2 includes a second fan MCU 252-2 and a corresponding second fan inverter circuit 254-2.

[0045] Specifically, the disclosure takes the architecture of the first fan control circuit 250-1 shown in Figure 5 as an example to elaborate the control of the evaporative fan 149.

[0046] In Figure 5 , the first fan inverter circuit 254-1 includes three inverter circuits, respectively identified as M1, M2 and M3. Through the three inverter circuits, 24V second DC is converted into three-phase U, V, W electricity, and is output to the evaporative fan 149 through the U, V, W ports shown in Figure 5 to provide power for the operation of the evaporative fan 149.

[0047] In the first fan inverter circuit 254-1, sampling resistors RB1 and RB2 are respectively arranged for the U, V two phases of the evaporative fan 149. The first fan MCU 252-1 samples the voltage of the two sampling resistors, and amplifies the sampling voltage by using an amplifier in the first fan MCU 252-1. The first fan MCU 252-1 can obtain the current values and phase current frequencies of the U, V two phases according to the amplified voltage value and the amplifier's amplification coefficient and range, and then calculates the current value and phase current frequency of the W phase through the node current law .

[0048] After obtaining the above information, the first fan MCU 252-1 outputs corresponding motor control pulse-width modulation (MCPWM) signals through the AL, AH, BL, BH, CL, CH ports to control the first fan inverter circuit 254-1 according to the current values and phase current frequencies of the phases, so as to control the rotating speed of the evaporative fan 149. In the disclosure, the rotating speed of the evaporative fan 149 is calculated by the following formula:

[0049]

[0050] wherein,​ represents the number of motor pole pairs, represents the phase current frequency.

[0051] In some examples, the main control MCU 230 adopts different control strategies for the evaporative fan and the condensing fan according to the real-time working condition of the refrigeration system. For example, in the defrosting mode, the evaporative fan can be stopped from running, while the condensing fan can be run as needed. In the forced cooling mode, the rotation speed of both can be increased at the same time to obtain the maximum refrigeration efficiency.

[0052] Specifically, when the main control MCU 230 collects the temperature signal collected from the outside world, it sends a control instruction to the first fan MCU 252-1 through the serial time-sharing communication circuit 260. The first fan MCU 252-1, as a slave, adjusts the MCPWM signal output to the first fan inverter circuit 254-1 according to the instruction after receiving the instruction to control the rotation speed of the evaporative fan 149, and obtains the actual rotation speed of the evaporative fan 149 by sampling the sampling resistor, and then uploads the working state of the evaporative fan 149 to the main control MCU 230 through the serial time-sharing communication circuit 260 for processing. In addition, the first fan MCU 252-1 also collects the U, V, and W three-phase currents in real time and compares them with the set protection current threshold value. When any one of the phase currents exceeds the threshold value, the MCPWM signal output is immediately reduced or turned off, and error flag information is uploaded to the main control MCU 230 for recording and processing, preventing damage to the first fan control circuit 250-1 and the evaporative fan caused by excessive phase current.

[0053] Based on the above-mentioned first fan control circuit 250-1, not only can the main control MCU 230 control the rotation of the fan, but also can know in real time whether the fan is running accurately according to the instruction and the health status of the fan.

[0054] It can be understood that in the present disclosure, the architecture and control scheme of the second fan control circuit 250-2 are similar to those of the first fan control circuit 250-1, and the architecture and control scheme of the compressor control circuit 240 are also similar to those of the first fan control circuit 250-1, which will not be repeated here.

[0055] Figure 6 The implementation architecture of the serial time-sharing communication circuit 260 is shown in the figure. The serial time-sharing communication circuit 260 is mainly composed of a serial communication module 261, a time-sharing module 262, and a communication protocol module 263. Figure 6In the present disclosure, the serial time-division communication circuit 260 includes an analog multiplexer 262, which includes at least 8 signal pins, i.e. 4 channels. The master MCU 230 selectively communicates with the compressor MCU 242 or the fan MCUs 252 by controlling the analog multiplexer 262. Specifically, the master MCU 230 uses only one of its own UART interfaces (including TX0 and RX0 pins). The transmit and receive lines of this UART interface are connected to the common terminal (com) of the analog multiplexer 262. The analog multiplexer 262 has multiple channels, each of which is connected to the UART interface of one MCU. For example, channel 0 (ch0) is connected to the RX1 and TX1 pins of the compressor MCU 242, channel 1 (chl) is connected to the RX2 and TX2 pins of the first fan MCU 252-1, and channel 2 (ch2) is connected to the RX3 and TX3 pins of the second fan MCU 252-2.

[0056] The master MCU 230 sends a selection signal (SEL) to the analog multiplexer 262 through its general-purpose input / output (GPIO) pins. By changing the level combination of the selection signal, the master MCU 230 can control the analog multiplexer 262 to connect the common terminal (TX0 / RX0) to any selected channel.

[0057] In detail, when the master MCU 230 wants to communicate with the compressor MCU 242, the master MCU 230 first sets the selection signal through the GPIO to make the analog multiplexer 262 connect TX0 / RX0 to channel 0 (connected to the compressor MCU). At this time, a point-to-point physical communication link is formed between the master MCU 230 and the compressor MCU 242. They exchange data through the standard UART protocol.

[0058] After the communication is completed, if the master MCU 230 wants to communicate with the first fan MCU 252-1, it will change the selection signal to make the analog multiplexer 262 disconnect channel 0 and connect channel 1 instead. At this time, a communication link is established between the master MCU 230 and the first fan MCU 252-1 for data exchange.

[0059] Through the above communication mode, the main control MCU 230 communicates with each slave MCU in turn in time, realizing time-sharing communication. Not only the hardware resources and pins of the main control MCU are saved, and the cost is reduced, but also since the communication link is physically point-to-point at any time, the communication between MCUs does not interfere with each other, ensuring the stability of the signal and the communication rate, effectively solving the problem that the multiple connection lines are easily disturbed in the existing scheme.

[0060] In the control device 200 of the refrigeration equipment, the main heat source is the power semiconductor devices, which include power transistors in the first inverter circuit 244 and the second inverter circuit 254, such as Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or Insulate-Gate Bipolar Transistor (IGBT). In order to efficiently manage the heat, the present disclosure adopts a unified heat dissipation design. As shown in Figure 2 The compressor control circuit and the fan control circuit are arranged in a region 270, that is, the first inverter circuit 244 and the second inverter circuit 254 are arranged in the region 270. This centralized layout makes these circuits share the same heat sink. In this unified heat dissipation design, using one large and centralized heat sink usually has higher heat dissipation efficiency and lower cost than using multiple small and scattered heat sinks. In addition, it is also possible to isolate the electronic devices of the control device from the harsh motor environment, that is, integrating all control circuits on a single printed circuit board 210 and uniformly dissipating heat, so that the entire control device 200 can be installed as a whole in a relatively cool, clean and small vibration location inside the refrigeration equipment, away from the high temperature and mechanical vibration generated by the compressor and fan body. This can also solve the problem of high failure rate of the fan controller due to harsh environment, greatly improving the long-term stability and service life of the entire electronic control system.

[0061] In Figure 2 The control device 200 further includes a signal acquisition and external communication interface 290 connected with the main control MCU 230, which is used for the main control MCU 230 to communicate with external devices of the control device 200. In the present disclosure, the interface 290 is usually in the form of a connector arranged on the printed circuit board 210.

[0062] Specifically, the interface 290 is connected to a plurality of external sensors 292. For example, temperature sensors (such as NTC thermistors) can be placed at different locations (such as the air outlet, air return, and middle of the cabinet) within the refrigeration equipment compartment 120 for accurate measurement and monitoring of the internal temperature. The main control MCU 230 reads the signals of these sensors through the interface 290 as the main input of the refrigeration control algorithm.

[0063] In addition, the interface 290 can serve as a communication module for external communication, which can be a 4G / LTE module, a Wi-Fi module, or an Ethernet module. The main control MCU 230 packages all the collected data, including the internal temperature, the real-time running status (speed, current, power consumption, fault code, etc.) of the compressor and the fan, and uploads them to a remote server or cloud platform 294 through the Internet. This allows the device owner or maintenance personnel to monitor the running status of the refrigeration equipment 100 in real time, receive fault alarms, and analyze historical data to optimize energy consumption through a mobile APP or a webpage via the remote server or cloud platform 294.

[0064] It should be noted that the technical solutions disclosed in the present disclosure can be combined arbitrarily without conflict.

[0065] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A control device of a refrigerating apparatus, characterized by comprising: The control device comprises a power supply circuit, a main control MCU, a compressor control circuit, at least one fan control circuit and a serial time-sharing communication circuit arranged on the printed circuit board, The power supply circuit is configured to rectify alternating current into direct current to supply power to the main control MCU, the compressor control circuit and the at least one fan control circuit; The compressor control circuit comprises a compressor MCU configured to control the compressor and a first inverter circuit configured to drive the compressor; The at least one fan control circuit comprises a fan MCU configured to control the fan and a second inverter circuit configured to drive the fan; The serial time-sharing communication circuit is configured to establish a time-sharing communication connection between the main control MCU and the compressor MCU and the fan MCU.

2. The control device according to claim 1, characterized by The at least one fan control circuit comprises a first fan control circuit configured to control and drive an evaporating fan and a second fan control circuit configured to control and drive a condensing fan.

3. The control device of claim 1, wherein The power supply circuit comprises a rectifier circuit and an isolation circuit; the rectifier circuit is configured to rectify external alternating current into first direct current with a voltage value of 310 V, and the isolation circuit is configured to reduce the voltage of the first direct current to 24 V to obtain second direct current; the first direct current is configured to supply power to the compressor, and the second direct current is configured to supply power to the at least one fan control circuit and the main control MCU.

4. The control device of claim 3, wherein An input end of the rectifier circuit is connected to the external alternating current, and an output end of the rectifier circuit is connected to the compressor and an input end of the isolation circuit, respectively; and an output end of the isolation circuit is configured to supply power to the at least one fan control circuit and the main control MCU.

5. The control device of claim 3, wherein The power supply circuit further comprises a step-down circuit configured to convert the second direct current into third direct current with a voltage value of 15 V and fourth direct current with a voltage value of 5 V; the third direct current is configured to supply power to the first inverter circuit, and the fourth direct current is configured to supply power to the compressor MCU.

6. The control device of claim 1, wherein The serial time-sharing communication circuit comprises an analog multiplex signal separator; the main control MCU selectively communicates with the compressor MCU or the fan MCU by controlling the analog multiplex signal separator.

7. The control device of claim 1, wherein The at least one fan control circuit further comprises a sampling resistor arranged at an output end of the fan control circuit; the fan MCU is configured to determine the running state of the fan based on the signal of the sampling resistor and feed back the running state to the main control MCU through the serial time-sharing communication circuit.

8. The control device of claim 1, wherein The compressor control circuit and the at least one fan control circuit are arranged on the same region on the printed circuit board to uniformly dissipate heat of the compressor control circuit and the at least one fan control circuit on the region.

9. The control device of claim 1, wherein The control device further comprises a signal acquisition and external communication interface connected to the main control MCU and configured to communicate with external devices of the control device.

10. A refrigeration appliance characterized in that, The refrigeration equipment comprises a compressor and a fan, and further comprises the control device of the refrigeration equipment according to any one of claims 1 to 9.

Images