Bus-connected multifunctional direct-current fan control panel

Abstract

The utility model discloses a multifunctional direct-current fan control panel connected through a bus. The multifunctional direct-current fan control panel comprises an MCU control unit, a PWM output circuit, a temperature acquisition circuit, a bus communication circuit and a motor feedback circuit. Wherein one side of the MCU control unit is connected and communicated with the charging pile control system processor through the bus communication circuit; the other side of the MCU control unit is electrically connected with the direct current fan through a PWM output circuit, a temperature acquisition circuit and a motor feedback circuit. The MCU control unit is used for reporting the working temperature and the operation state information to the charging pile control system processor, receiving control information issued by the charging pile control system processor according to the working temperature and the operation state information, and stopping outputting PWM pulse signals to the direct current fan when the direct current fan breaks down. The technical scheme provided by the utility model not only facilitates wiring and installation of the charging pile, but also reduces noise and saves energy, and ensures the stability and reliability of a charging pile control system.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation of charging piles, in particular to a multifunctional DC fan control board connected to a bus. Background Art

[0002] At present, AC fans are mainly used for heat dissipation in charging pile cooling systems. The problem with AC fans is that they are noisy and high-power when turned, and the fan speed cannot be automatically adjusted according to the temperature inside the pile. At the same time, there are also some solutions that use DC fans for heat dissipation. However, this fan control board is relatively simple. As long as the power is turned on, the entire fan will run at a fixed speed. It is still noisy and high-power, and the fan failure rate is also high due to long-term transportation. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, a bus-connected multifunctional DC fan control panel is proposed.

[0004] A bus-connected multifunctional DC fan control board, comprising an MCU control unit, a PWM output circuit, a temperature acquisition circuit, a bus communication circuit and a motor feedback circuit;

[0005] The MCU control unit is connected and communicates with the charging pile control system processor through the bus communication circuit;

[0006] The MCU control unit is electrically connected to the DC fan through the PWM output circuit, the temperature acquisition circuit, and the motor feedback circuit respectively;

[0007] Among them, the PWM output circuit is used to output a PWM pulse signal to the DC fan; the temperature acquisition circuit is used to collect the operating temperature of the DC fan in the charging state; the motor feedback circuit is used to send the operating temperature and the operating status information of the DC fan to the MCU control unit; the MCU control unit is used to report the operating temperature and operating status information to the charging pile control system processor, receive the control information issued by the charging pile control system processor according to the operating temperature and operating status information, and stop outputting PWM pulse signals to the DC fan when a fault occurs in the DC fan; the control information includes controlling the speed of the DC fan.

[0008] Preferably, the bus communication circuit adopts RS485 communication circuit.

[0009] Preferably, a power supply is also connected to the multifunctional DC fan control panel, and the power supply is a built-in power supply or an external power supply.

[0010] Preferably, the number of the PWM output circuit and the number of the temperature acquisition circuit are both more than one.

[0011] Preferably, the MCU control unit is also connected to the charging pile control system processor via a DIP switch.

[0012] Preferably, the dip switch is a 4-position dip switch.

[0013] Preferably, it also includes an LED indicator light electrically connected to the MCU control unit.

[0014] The bus-connected multifunctional DC fan control board provided by the utility model has the following working principle: it is connected and communicated with the charging pile control system processor through a bus communication circuit, and receives a PWM wave control signal sent by the charging pile control system processor, and controls the rotation of the DC fan through a PWM output circuit; at the same time, the collected temperatures and the operating status of the DC fan are sent to the charging pile control system processor in real time through a temperature acquisition circuit and a motor feedback circuit, and the charging pile control system processor adjusts the speed of the DC fan in real time according to the current.

[0015] The technical solution provided by the utility model is that when the charging pile is not charging, the DC fan runs at a low speed, achieving the effect of noise reduction and energy saving; in the charging state, the speed of the DC fan is timely adjusted through the temperature detection of the pile body, the heat in the pile is discharged, and the temperature in the pile is controlled within the allowable range, thereby reducing the fan failure rate and ensuring the stability and reliability of the charging pile control system.

[0016] The technical effects of the multifunctional DC fan control board connected by this bus are:

[0017] 1) Through bus control, the connection lines between the charging pile control system processor and the fan control board are reduced, making it easier to install the charging pile wiring.

[0018] 2) Through the pile body temperature detection, the speed of the DC fan is adjusted in real time. When the charging pile is not charging, the DC fan runs at a low speed, achieving noise reduction and energy saving. When charging, the temperature of the pile is detected and the speed of the DC fan is adjusted to discharge the temperature in the pile in time. The temperature in the pile is controlled within the allowable range, ensuring the stability and reliability of the charging pile control system.

[0019] 3) The working status of the DC fan is input to the input detection signal terminal of the DC fan control board, which can monitor whether the DC fan is faulty. When a fault is detected, the output of the PWM wave signal is stopped and reported to the charging pile control system processor through the bus. The charging pile control system processor reports the DC fan fault to the platform, stops charging, and notifies the after-sales staff, thereby ensuring the safety and reliability of the entire charging pile, achieving intelligent perception, and improving the stability and reliability of the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The principle block diagram of the multifunctional DC fan control board connected to the bus;

[0021] Figure 2 This is the schematic diagram of the RS485 communication circuit;

[0022] Figure 3 This is the schematic diagram of the PWM output circuit and the motor feedback circuit;

[0023] Figure 4 This is the schematic diagram of the temperature acquisition circuit;

[0024] Figure 5 This is the schematic diagram of the DIP switch;

[0025] Figure 6 This is the schematic diagram of the MCU control unit and LED indicator light. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] Provide a bus-connected multifunctional DC fan control panel, such as Figure 1 As shown, it includes: an MCU control unit, a PWM output circuit, a temperature acquisition circuit, a bus communication circuit and a motor feedback circuit.

[0028] In terms of connection relationship, the MCU control unit is connected and communicates with the charging pile control system processor through a bus communication circuit; the MCU control unit is electrically connected to the DC fan through a PWM output circuit, a temperature acquisition circuit, and a motor feedback circuit respectively.

[0029] Functionally, the PWM output circuit is used to output PWM pulse signals to the DC fan; the temperature acquisition circuit is used to collect the operating temperature of the DC fan in the charging state; the motor feedback circuit is used to send the operating temperature and operating status information of the DC fan to the MCU control unit; the MCU control unit is used to report the operating temperature and operating status information to the charging pile control system processor, receive the control information issued by the charging pile control system processor based on the operating temperature and operating status information, and stop outputting PWM pulse signals to the DC fan when a fault occurs in the DC fan; the control information includes controlling the speed of the DC fan.

[0030] When the charging pile is not charging, the DC fan runs at a low speed, achieving the effect of noise reduction and energy saving; in the charging state, the DC fan speed is adjusted in time through the temperature detection of the pile body to discharge the heat inside the pile, control the temperature inside the pile within the allowable range, and reduce the fan failure rate.

[0031] When a fault is detected, the PWM wave signal output is stopped and reported to the charging pile control system processor through the bus communication circuit. The charging pile control system processor reports the platform DC fan fault and stops charging, and notifies the after-sales staff; thereby ensuring the safety and reliability of the entire charging pile, realizing intelligent perception, and ensuring the stability and reliability of the charging pile control system.

[0032] Furthermore, the bus communication circuit adopts RS485 communication circuit, but is not limited thereto.

[0033] Furthermore, a power supply is also connected to the multifunctional DC fan control panel, and the power supply is a built-in power supply or an external power supply, that is, the power supply can be flexibly configured according to actual needs.

[0034] Furthermore, the number of PWM output circuits and temperature acquisition circuits is more than one, that is, a multifunctional DC fan control board can correspond to multiple PWM output circuits and temperature acquisition circuits.

[0035] Furthermore, the MCU control unit is also connected to the charging pile control system processor via a dip switch. The dip switch may be a 4-bit dip switch, but is not limited thereto. Through the dip switch, the charging pile control system processor can be connected to multiple multi-functional DC fan control boards at the same time, supporting multiple DC fan control boards to be connected in parallel.

[0036] Furthermore, it also includes an LED indicator light electrically connected to the MCU control unit, and the LED indicator light is used to indicate the operating status of the control board in real time.

[0037] Specifically, in one embodiment, each circuit module of the multifunctional DC fan control board is implemented as follows:

[0038] like Figure 2 As shown, the bus communication circuit adopts RS485 communication circuit, where U3 is an isolation power module, which is used to isolate the RS485 power supply from the main control MCU processor power supply. C11, C12, and C13 are filter capacitors, and R17 is a load resistor, which is used to isolate the power supply load to stabilize the output voltage and to isolate the RS485 power supply from the main control MCU processor.

[0039] U2 is the RS485 communication chip, U1 is the digital isolation chip, used for the main control MCU processor signal isolation, among which GDT1 is used for RS485 bus lightning protection, ESD14, ESD15, ESD16 are RS485 electrostatic protection, Q1, R7, R13 form RS485 automatic switching of receiving and sending signals. Network P74-RXD, P31-TXD are connected to the main control MCU to process UART serial communication.

[0040] like Figure 3 As shown, there is one PWM output and motor feedback circuit. The other three PWM output and motor feedback circuits are the same, so they are omitted. Among them, U4 and the peripheral circuit form a step-down circuit, and the VCC output voltage determines the PWM output voltage amplitude. J1 is for different voltage output selection. When the 1-2 pins are short-circuited, the VCC output voltage is 5V; when the 1-2 pins are short-circuited, the VCC output voltage is 10V. ESD18 is for electrostatic protection, and F2 is for output short circuit protection or overload protection.

[0041] U8 is a PWM pulse output isolation digital chip, which is used to isolate the DC motor control signal from the MUC processor to enhance anti-interference ability. Network P10-PWMO00 is the MCU processor output PWM pulse signal, and the isolated digital chip outputs the PWM0 pulse signal, which is input to the base of the N4 digital transistor after resistor R52 and voltage division. N4 is used for PWM pulse output level conversion. The PWM output voltage amplitude is determined by the VCC voltage; B0 is the motor speed feedback signal output, R69 is the fan feedback signal pull-up resistor, and the motor speed feedback signal is input to the digital isolation chip input pin through the R70 and C60 filter circuits. After isolation, it is input to the MCU processing pin P136-I NTP0 for motor speed test, which is used for motor fault detection.

[0042] like Figure 4 As shown in the figure, the temperature acquisition circuit, where Q3 is a reference voltage chip, which provides accurate reference voltage for AD acquisition. R24 is a current limiting resistor, C15 and C16 form a reference voltage filter circuit, and T+-T- is an external PT1000 temperature sensor, which is converted into a voltage through R25 and R28 voltage divider resistors and input to the MCU processor for ADC value sampling, thereby calculating the temperature. ESD6, ESD24, and ESD5 form an electrostatic protection circuit. R26, C14, and C17 form a low-pass filter circuit; P15-AN17 are input to the AD sampling pin of the MCU processor.

[0043] like Figure 5As shown in the figure, a 4-bit DIP switch is configured. Among them, resistors R23, R71, R72, and R74 are connected to VCC3_8 to provide pull-up for the processor GPIO pin input level. Switch 1 is used to identify the external fan feedback type by software. For example, "1" represents FG mode and "0" represents RD mode to adapt to two different fan feedback signal types on the market. Switches 2-4 are used for RS485 address allocation of this control board to support parallel connection of multiple DC fan control boards.

[0044] like Figure 6 The figure shows the MCU control unit and LED indicator. The MCU control unit uses an 8-bit MO core processor, and the indicator light is driven by the MUC GPIO pin (P147) through the current limiting resistor R35 to directly drive LED1 to emit light, indicating the operation status of the control board in real time. For example, if it is operating normally, it will be on for 0.5 seconds and off for 0.5 seconds, and it will be always on if there is a fault.

[0045] In this embodiment, the fan control board has four PWM wave outputs for controlling the speed of the DC motor; four input signals with optional levels and frequencies for detecting the speed of the DC motor, and together with the PWM wave output control, determining the motor operating status; four temperature monitoring, through an external PT1000 temperature sensor, to adjust the DC fan speed according to the pile body temperature. The fan control board communicates with the charging pile control system processor through the RS485 interface, and the charging pile control system processor sends instructions to the fan control board to adjust the fan speed according to the current pile body temperature to achieve energy saving and quiet effects. There are four-position DIP switches on the fan control board, one for selecting the fan operating status, and three for fan control board address selection, so as to achieve simultaneous control of multiple fan control boards and expand the number of connected fans. The PWM wave output levels are 5V and 10V, and different voltage outputs are selected through the onboard jumper to adapt to motors with different levels of PWM wave control signals.

[0046] The above is an explanation of the bus-connected multifunctional DC fan control board of the utility model, which is used to help understand the utility model; however, the implementation method of the utility model is not limited to the above-mentioned embodiments, and any changes, modifications, substitutions, combinations, and simplifications made without departing from the principles of the utility model should be equivalent replacement methods and are included in the protection scope of the utility model.

Claims

1. A bus-connected multifunctional DC fan control panel, characterized in that: It includes MCU control unit, PWM output circuit, temperature acquisition circuit, bus communication circuit and motor feedback circuit; The MCU control unit is connected and communicates with the charging pile control system processor through the bus communication circuit; The MCU control unit is electrically connected to the DC fan through the PWM output circuit, the temperature acquisition circuit, and the motor feedback circuit respectively; Among them, the PWM output circuit is used to output a PWM pulse signal to the DC fan; the temperature acquisition circuit is used to collect the operating temperature of the DC fan in the charging state; the motor feedback circuit is used to send the operating temperature and the operating status information of the DC fan to the MCU control unit; the MCU control unit is used to report the operating temperature and operating status information to the charging pile control system processor, receive the control information issued by the charging pile control system processor according to the operating temperature and operating status information, and stop outputting PWM pulse signals to the DC fan when a fault occurs in the DC fan; the control information includes controlling the speed of the DC fan.

2. The bus-connected multifunctional DC fan control board according to claim 1, characterized in that: The bus communication circuit adopts RS485 communication circuit.

3. The bus-connected multifunctional DC fan control board according to claim 1, characterized in that: Also connected to the multifunctional DC fan control panel is a power supply, which is a built-in power supply or an external power supply.

4. The bus-connected multifunctional DC fan control board according to claim 1, characterized in that: The number of the PWM output circuit and the number of the temperature acquisition circuit are both more than one.

5. The bus-connected multifunctional DC fan control board according to any one of claims 1 to 4, characterized in that: The MCU control unit is also connected to the charging pile control system processor via a DIP switch.

6. The bus-connected multifunctional DC fan control board according to claim 5, characterized in that: The dip switch is a 4-position dip switch.

7. The bus-connected multifunctional DC fan control board according to claim 5, characterized in that: Also included is an LED indicator light electrically connected to the MCU control unit.

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