Variable-frequency double-fan driving control panel

Abstract

The utility model discloses a variable-frequency double-fan drive control panel, which relates to the technical field of variable-frequency fan control and comprises a control circuit, the control circuit comprises a single-chip microcomputer, a control circuit and a power supply circuit, the power supply circuit comprises a step-down chip and is used for outputting 15V, 12V and 5V direct-current voltages, and the 12V direct-current voltage is output to the relay; the storage circuit comprises a storage chip; the IPM module comprises a temperature acquisition circuit and an overload protection circuit; the terminal CN7 is used for controlling high, medium and low rotating speed adjustment of the motor; the dial switches SW1 and SW2 are used for conveying fan setting parameters to the single chip microcomputer; and the connecting ends of the needle seat FAN1 and the needle seat FAN2 are connected with the driving circuit and the double fans. According to the utility model, the control panel for external adjustment is installed and set outside the fan, the fan can quickly and stably reach a set temperature value by adjusting the speed of the fan, and after the set temperature value is reached, the fan can be reduced to a certain rotating speed in a stepless speed change manner, so that the fan is stabilized at the set temperature.

Description

Technical Field

[0001] This utility model relates to the field of variable frequency fan control technology, specifically a variable frequency dual fan drive control board. Background Technology

[0002] In this era of fierce competition in energy-saving and environmentally friendly products, air source heat pumps stand out from their peers due to their green, environmentally friendly, safe, and cost-effective advantages. Fan coil units, as a terminal device for air source heat pump output, account for a significant proportion of practical applications. Furthermore, with the continuous development of the global economy and the rapid expansion of the construction industry, the market demand for fan coil units is showing a steady growth trend. Analysis of the current state of the fan coil unit industry indicates that, especially in emerging markets and developing countries, the increasing urbanization and rising living standards have led to a continuous increase in demand for air conditioning equipment, thereby driving the growth of the fan coil unit market.

[0003] A fan coil unit consists of a fan, coil, and filter. As a terminal device in an air conditioning system, it is installed separately in each air-conditioned room and can independently process the air. The chilled or hot water required for air processing is centrally prepared in the air conditioning room and supplied to each fan coil unit through a water supply system.

[0004] The advantages of air fan coil units include simple structure, easy installation, stable operation, and convenient maintenance. Furthermore, because each fan coil unit can be controlled independently, it allows for precise control of different areas, improving the flexibility and energy efficiency of the air conditioning system.

[0005] Variable frequency fan coil units achieve a fast and stable temperature by adjusting the fan speed. Once the set temperature is reached, the fan can continuously reduce its speed to a certain level, thus stabilizing the temperature, reducing noise, and improving comfort.

[0006] The key to variable frequency fans is the variable frequency drive technology of the fans. To this end, we propose a variable frequency dual fan drive control board. Utility Model Content

[0007] The purpose of this invention is to provide a variable frequency dual fan drive control board to solve the problems mentioned in the prior art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a variable frequency dual-fan drive control board, including a control circuit, the control circuit comprising:

[0009] Microcontrollers, including communication chips;

[0010] The power supply circuit includes a step-down chip for outputting 15V, 12V, and 5V DC voltages, with the 12V DC voltage output to the relay.

[0011] Storage circuits, including storage chips;

[0012] The IPM module includes a temperature acquisition circuit and an overload protection circuit.

[0013] Terminal CN7 controls the high, medium, and low speed adjustment of the motor.

[0014] DIP switches SW1 and SW2 are used to transmit the fan setting parameters to the microcontroller.

[0015] The pin headers FAN1 and FAN2 are connected to the drive circuit and the dual fans.

[0016] 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.

[0017] Furthermore, the circuit output DC voltage relays are configured as two, namely the first relay and the second relay.

[0018] Furthermore, the microcontroller also includes a control chip, a decoding chip, and a data processing module, and is used for data transmission, speed command decoding, and speed feedback calculation.

[0019] Furthermore, the number of fans is set to two, and each fan is connected to a drive circuit through pin headers FAN1 and FAN2 respectively;

[0020] Furthermore, the terminal CN7 is used to select high, medium, and low speeds and send signals to the microcontroller to adjust the speed.

[0021] Furthermore, the DIP switch circuit can select different speed groups, each speed group corresponding to a different fan setting;

[0022] Furthermore, the storage circuit is used to save the configuration settings of the fan, such as speed selection, operating mode and other parameters.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows: It has a protection circuit, a drive circuit, and a feedback speed regulation circuit. When starting up, the 220V AC mains power is connected to the circuit, and after passing through the transformer and rectifier bridge, it enters the step-down chip. After processing by the step-down chip, it can output 15V, 12V, and 5V DC voltage. The 12V DC voltage is output to two relays. At this time, the first relay is energized, but the second relay is not energized. The 220V AC power passes through the thermistor starter. After a few seconds, the second relay is energized. After passing through the rectifier bridge, the AC power can output 310V DC voltage. At this time, the power supply circuit completes its work, and the IPM module obtains power to drive the fan. The fan is connected to the control board through pin headers FAN1 and FAN2. The IPM module receives six drive signals from the microcontroller and controls the three-phase current of the fan motor through its built-in drive circuit to adjust the fan speed. Thus, by adjusting the speed of the fan, the set temperature value can be reached quickly and stably. Once the set temperature is reached, the fan can continuously reduce its speed to a certain level, thereby stabilizing the set temperature, reducing noise and improving comfort. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the circuit principle of the first part of this utility model;

[0025] Figure 2 This is a schematic diagram of the circuit principle of the second part of this utility model;

[0026] Figure 3 This is a schematic diagram of the circuit principle of the third part of this utility model;

[0027] Figure 4 This is a schematic diagram of the circuit principle of the fourth part of this utility model. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figure 1 and Figure 4 As shown, this utility model provides the following technical solution: a variable frequency dual-fan drive control board, including a control circuit, the control circuit comprising:

[0030] Microcontrollers, including communication chips;

[0031] The power supply circuit, including the step-down chip, is mainly used to output 15V, 12V, and 5V DC voltages, with the 12V DC voltage output to the relay.

[0032] Storage circuits, including storage chips;

[0033] The IPM module includes a temperature acquisition circuit and an overload protection circuit.

[0034] Pin headers FAN1 and FAN2 connect to the drive circuit and the dual fans. High-quality connectors are used in FAN1 and FAN2 to ensure reliable connection to the fan motors. The drive circuit adjusts the current and voltage input to the fan motor based on control signals output from the microcontroller, thus achieving fan speed regulation. The drive circuit can employ pulse width modulation (PWM) technology, controlling the motor's input voltage by changing the duty cycle of the PWM signal, thereby regulating the motor speed. Simultaneously, the drive circuit also features overcurrent protection and short-circuit protection. When abnormal current is detected, it promptly cuts off the power supply to the fan, protecting the fan and drive circuit from damage.

[0035] Terminal CN7 controls the high, medium, and low speed adjustment of the motor. Terminal CN7 is a multi-pin connector; different pins connect to the motor's high, medium, and low speed control circuits. The microcontroller adjusts the motor speed by controlling the level states of the corresponding pins based on received control commands or preset operating modes. For example, when high-speed operation is required, the microcontroller outputs a high level on the corresponding high-speed control pin and a low level on other pins, switching the motor to high-speed operation.

[0036] DIP switches SW1 and SW2 are used to transmit the fan's set parameters to the microcontroller. SW1 and SW2 are mechanical DIP switches, offering good tactile feedback and stability. Each DIP switch can be set to multiple different states, allowing for the setting of various fan parameters through different combinations. For example, SW1 can be used to set the fan's operating mode (such as manual mode, automatic mode, etc.), while SW2 can be used to set the fan's timer or wind speed level. The microcontroller periodically scans the DIP switch states to obtain the set parameters and adjusts the control strategy accordingly.

[0037] This embodiment provides a variable frequency dual-fan drive control board, which has a protection circuit, a drive circuit, and a feedback speed regulation circuit. At startup, 220V AC mains power is connected to the circuit, passing through a transformer and rectifier bridge before entering the step-down chip. The step-down chip processes the voltage to output 15V, 12V, and 5V DC voltages. The 12V DC voltage is output to two relays; the first relay is engaged, while the second relay is not. The 220V AC power passes through a thermistor starter. After a few seconds, the second relay engages, and the AC power, after passing through the rectifier bridge, outputs 310V DC voltage. At this point, the power supply circuit is complete, and the IPM module receives power to drive the fan. The fan is connected to the control board via pin headers FAN1 and FAN2. The IPM module receives six drive signals from the microcontroller and controls the three-phase current of the fan motor through its built-in drive circuit, adjusting the fan speed. This speed regulation allows the fan to quickly and stably reach the set temperature value. Once the set temperature is reached, the fan can continuously reduce its speed to a certain level, thereby stabilizing the set temperature, reducing noise and improving comfort.

[0038] The power supply circuit also includes a transformer and a rectifier bridge. The transformer and rectifier bridge are used to supply AC power to the step-down chip. The rectifier bridge converts AC power to DC power. The transformer and rectifier bridge process the AC power supplied to the step-down chip. The power supply circuit also includes a thermistor starter and a rectifier bridge. The circuit inputs a 310V high-voltage current into the IPM module. The first and second relays are used for automatic adjustment, safety protection, and switching circuits. The power supply circuit also includes a thermistor starter, a rectifier bridge, and a voltage regulator. The power supply circuit drives the fan. The thermistor starter provides overheat protection in the power supply circuit. The microcontroller also includes a control chip, a decoding chip, and a data processing module. The microcontroller is used for data transmission and speed command decoding. This microcontroller integrates functions such as speed command decoding, speed feedback calculation, and precise acceleration / deceleration control. It also provides overload protection for the entire circuit during startup to prevent damage from excessive voltage. The system boasts high integration and excellent control performance. Two fans are configured, each connected to a drive circuit via pin headers FAN1 and FAN2. Terminal CN7 is used to select high, medium, and low speeds, sending signals to the microcontroller for motor speed adjustment. DIP switches SW1 and SW2 select different speed groups, each corresponding to a different fan setting. Other operating parameters, such as fan operating time and wind speed mode, can also be set via DIP switches. Each DIP switch position represents a specific parameter option. The temperature acquisition circuit in the IPM module detects the module's temperature; if the temperature exceeds the safe range, it triggers protection measures to prevent overheating and damage. Furthermore, the temperature acquisition circuit can detect temperature changes in a timely manner and provide feedback signals to adjust power output. The overload protection circuit detects current to prevent fan overload operation, protecting the motor and drive module.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A variable frequency dual-fan drive control board, characterized in that, Includes a control circuit, which includes: Microcontrollers, including communication chips; The power supply circuit includes a step-down chip for outputting 15V, 12V, and 5V DC voltages, with the 12V DC voltage output to the relay. Storage circuits, including storage chips; The IPM module includes a temperature acquisition circuit and an overload protection circuit. Terminal CN7 controls the high, medium, and low speed adjustment of the motor. DIP switches SW1 and SW2 are used to transmit the fan setting parameters to the microcontroller. The pin headers FAN1 and FAN2 are connected to the drive circuit and the dual fans.

2. The variable frequency dual-fan drive control board according to claim 1, characterized in that: The power supply circuit also includes a transformer and a rectifier bridge, which are used to supply AC mains power to the step-down chip.

3. The variable frequency dual-fan drive control board according to claim 2, characterized in that: The circuit output DC voltage relays are set to two, namely the first relay and the second relay.

4. The variable frequency dual-fan drive control board according to claim 3, characterized in that: The circuit includes a thermistor starter and a rectifier bridge, which inputs a 310V high-voltage current into the IPM module.

5. The variable frequency dual-fan drive control board according to claim 4, characterized in that: The temperature acquisition circuit in the IPM module is used to detect the temperature of the IPM module. Once the temperature exceeds the safe range, protection measures are triggered to prevent the IPM module from overheating and being damaged. In addition, the temperature acquisition circuit can also detect temperature changes in a timely manner and provide feedback signals to adjust the power output. The overload protection circuit detects the current to prevent the fan from working overloaded and protects the motor and drive module.

6. The variable frequency dual-fan drive control board according to claim 5, characterized in that: The number of fans is set to 2, and each fan is connected to a drive circuit through pin headers FAN1 and FAN2.

7. The variable frequency dual-fan drive control board according to claim 6, characterized in that: The storage circuit is used to save the fan's configuration settings, such as speed selection and operating mode parameters.

8. The variable frequency dual-fan drive control board according to claim 7, characterized in that: The DIP switch circuit selects different speed groups, and each speed group corresponds to a different fan setting.

9. A variable frequency dual-fan drive control board according to claim 8, characterized in that: Terminal CN7 is used to select high, medium, and low speeds, and sends a signal to the microcontroller to adjust the speed.

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