A fixed frequency dehumidifier control board

Abstract

The utility model discloses a kind of fixed frequency dehumidifier control panel, it is related to dehumidifier control panel technical field, including control circuit, the control circuit includes: single-chip microcontroller, external sensor signal is collected by pin, after being handled by internal program, control signal is exported from corresponding pin, control relay works, to control external equipment;Control display module shows system information, and the data interaction with external equipment is realized by communication pin;Power supply circuit, including voltage reduction chip, for output 12V and 5V direct current voltage and 12V direct current voltage is directly input to relay;Terminal CN8, for connecting wire controller, receive control signal from user, for carrying out system setting;Electronic expansion valve circuit, for adjusting the flow of refrigerant.The fixed frequency dehumidifier control panel, sensor input real-time monitoring environmental parameter, such as temperature and humidity, liquid flow etc., provide feedback information for single-chip microcontroller, help its accurate control.

Description

Technical Field

[0001] This utility model relates to the technical field of dehumidifier control boards, specifically a fixed-frequency dehumidifier control board. Background Technology

[0002] In recent years, the dehumidifier market has shown a continuous growth trend, with the main demand coming from households, industries (such as food storage and pharmaceuticals), and commercial scenarios (such as museums and data centers). It is expected to maintain a high growth rate in the next few years.

[0003] Traditional fixed-frequency dehumidifiers generally have an energy efficiency ratio (EER) below 2.0, while variable-frequency models can reach 3.5-4.0. However, fixed-frequency models still hold a 65% market share due to their lower cost (30%-50% lower than variable-frequency models). Moreover, fixed-frequency dehumidifiers occupy a large market share due to their relatively affordable price and mature technology, leading to an increased demand for their control boards. Utility Model Content

[0004] The purpose of this invention is to provide a control board for a fixed-frequency dehumidifier to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fixed-frequency dehumidifier control board, comprising a control circuit, the control circuit including: a microcontroller, which acquires external sensor signals through pins, processes them through an internal program, and outputs control signals from corresponding pins to control relays to control external devices; a control display module that displays system information and achieves data interaction with external devices through communication pins; a power supply circuit, including a step-down chip, for outputting 12V and 5V DC voltages, with the 12V DC voltage directly input to the relays; a terminal CN8 for connecting a wired controller to receive control signals from the user for system settings; and an electronic expansion valve circuit for regulating the refrigerant flow rate.

[0006] Furthermore, the power supply circuit also includes a transformer and a rectifier bridge, which are used to supply mains power to the step-down chip.

[0007] Furthermore, the control circuit also includes a 5-channel relay drive circuit for controlling the start and stop of the fan and compressor equipment.

[0008] Furthermore, the control circuit also includes a sensor input module for real-time monitoring of environmental parameters, providing feedback information to the microcontroller to help it perform precise control.

[0009] Furthermore, the control circuit also includes an electronic expansion valve circuit for controlling the refrigerant flow rate.

[0010] Furthermore, the control circuit also includes a display module for displaying the current operating status of the system.

[0011] Furthermore, the control circuit also includes a communication interface for data transmission with other devices.

[0012] Furthermore, the control circuit also includes a protection circuit to prevent overload and short circuit. Furthermore, the control circuit also includes a button control circuit for implementing manual control functions. Furthermore, the control circuit also includes an alarm circuit for issuing audible or visual warning signals.

[0013] This utility model provides a control board for a fixed-frequency dehumidifier, which has the following beneficial effects: It features a protection circuit and a drive circuit. During startup, 220V AC mains power is connected to the circuit, passing through a transformer and rectifier bridge before entering a step-down chip. The chip processes the voltage to output 12V and 5V DC voltages, ensuring normal power supply to all components. Five relays control the start and stop of the fan, compressor, and other equipment, achieving equipment protection and safety control. Sensors input real-time monitoring of environmental parameters, such as temperature, humidity, and liquid flow rate, provides feedback information to the microcontroller, aiding in precise control. An electronic expansion valve controls the refrigerant flow rate to adjust the system's heat exchange efficiency. Through these various working processes, the equipment can operate efficiently and stably, achieving precise humidity control to meet typical household / commercial needs. Attached Figure Description

[0014] Fig. 1 This is a circuit diagram of the first part of a control board for a fixed-frequency dehumidifier according to the present invention;

[0015] Fig. 2 This is a circuit diagram of the second part of a control board for a fixed-frequency dehumidifier according to the present invention;

[0016] Fig. 3 This is a circuit diagram of the third part of a control board for a fixed-frequency dehumidifier according to the present invention.

[0017] Fig. 4 This is the circuit diagram of the fourth part of a control board for a fixed-frequency dehumidifier according to this utility model. Detailed Implementation

[0018] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0019] like Figs. 1 to 4As shown, a control board for a fixed-frequency dehumidifier includes a control circuit comprising: a microcontroller that acquires signals from external sensors (such as temperature and humidity) via pins, processes them through an internal program, and outputs control signals from corresponding pins to control relays and external devices; a control display module that displays system information and interacts with external devices via communication pins; a power supply circuit including a step-down chip for outputting 12V and 5V DC voltages, with the 12V DC voltage directly input to the relays; a terminal CN8 for connecting a wired controller to receive control signals from the user for system settings; and an electronic expansion valve circuit for regulating refrigerant flow.

[0020] At startup, the circuit is connected to 220V AC mains power. After AC power is connected, it is protected against overcurrent by a fuse, then surge protected by a varistor, and finally rectified by a rectifier bridge and filtered by a filter capacitor to obtain DC voltage. The DC voltage is then converted by a transformer and a switching power supply chip, and a feedback circuit adjusts the output to a stable DC voltage to power other circuits. Five relays control the start and stop of equipment such as fans and compressors, realizing equipment protection and safety control. The sensor input module monitors environmental parameters in real time, such as temperature, humidity, and liquid flow, providing feedback information to the microcontroller to help it make precise control. The electronic expansion valve is used to control the refrigerant flow to adjust the system's heat exchange efficiency. Through the control of the microcontroller, the various modules work closely together. After the dehumidification is started, the microcontroller controls the compressor relay to engage, the compressor is powered on and runs, and the refrigerant is compressed to achieve the refrigeration cycle. At the same time, the relays of fan 1 and fan 2 are controlled to operate, the fans run, and indoor air is drawn into the dehumidifier. When passing through the evaporator, water vapor condenses into water droplets upon cooling, achieving dehumidification. The dried air is then returned to the room. When the defrost sensor detects that the outdoor heat exchanger temperature is too low and reaches the frosting threshold, the microcontroller controls the four-way valve relay to change the refrigerant flow and initiate defrosting. It may also control the electric heating relay to activate electric heating for auxiliary defrosting. Status information is transmitted to external devices via communication port CN8, enabling this control board to perform functions such as automatic humidity adjustment, timed on / off switching, and fault self-diagnosis, improving the user experience. This fixed-frequency dehumidifier control board controls various operational aspects of the dehumidifier to ensure efficient and stable operation and achieve precise humidity control, meeting typical household / commercial needs.

[0021] The power supply circuit also includes a transformer and a rectifier bridge, which are used to supply mains power to the step-down chip. The control circuit also includes a 5-channel relay drive circuit for controlling the start and stop of the fan and compressor. The control circuit also includes a sensor input module for real-time monitoring of environmental parameters and providing feedback information to the microcontroller to help it perform precise control. The control circuit also includes an electronic expansion valve circuit for controlling refrigerant flow. The control circuit also includes a display module for displaying the current operating status of the system. The control circuit also includes a communication interface for data transmission with other devices. The control circuit also includes a protection circuit for preventing overload and short circuits. The control circuit also includes a button control circuit for implementing manual control functions. The control circuit also includes an alarm circuit for issuing audible or visual warning signals.

[0022] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A control board for a fixed-frequency dehumidifier, characterized in that, The system includes a control circuit comprising: a microcontroller that acquires signals from external sensors via pins, processes them through an internal program, and outputs control signals from corresponding pins to control relays and external devices; a control display module that displays system information and interacts with external devices via communication pins; a power supply circuit including a step-down chip that outputs 12V and 5V DC voltages, with the 12V DC voltage directly input to the relays; a terminal CN8 for connecting a wired controller to receive control signals from the user for system settings; and an electronic expansion valve circuit for regulating refrigerant flow.

2. The control board for a fixed-frequency dehumidifier according to claim 1, characterized in that, The power supply circuit also includes a transformer and a rectifier bridge, which are used to supply mains power to the step-down chip.

3. The control board for a fixed-frequency dehumidifier according to claim 2, characterized in that, The control circuit also includes a 5-channel relay drive circuit for controlling the start and stop of the fan and compressor equipment.

4. A fixed-frequency dehumidifier control board according to claim 3, characterized in that, The control circuit also includes a sensor input module, which is used to monitor environmental parameters in real time, provide feedback information to the microcontroller, and help it to perform precise control.

5. A fixed-frequency dehumidifier control board according to claim 4, characterized in that, The control circuit also includes an electronic expansion valve circuit for controlling the refrigerant flow rate.

6. A fixed-frequency dehumidifier control board according to claim 5, characterized in that, The control circuit also includes a display module for displaying the current operating status of the system.

7. A fixed-frequency dehumidifier control board according to claim 6, characterized in that, The control circuit also includes a communication interface for data transmission with other devices.

8. A fixed-frequency dehumidifier control board according to claim 7, characterized in that, The control circuit also includes a protection circuit to prevent overload and short circuit.

9. A fixed-frequency dehumidifier control board according to claim 8, characterized in that, The control circuit also includes a button control circuit for implementing manual control functions.

10. A fixed-frequency dehumidifier control board according to claim 9, characterized in that, The control circuit also includes an alarm circuit for issuing audible or visual warning signals.

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