Control panel applied to liquid cooling heat dissipation system

Abstract

The utility model discloses a control panel applied to a liquid cooling heat dissipation system, which is applied to a super charging pile, connected with the liquid cooling heat dissipation system of the super charging pile and communicated with a charging control module of the super charging pile through an RS485 bus. The control panel comprises an MCU unit, and an RS485 communication circuit, a PWM output and motor feedback circuit and a temperature acquisition circuit which are directly or indirectly connected with the MCU unit; wherein the PWM output and motor feedback circuit is used for controlling the rotating speed of the direct current motor and detecting the running state of the direct current motor; the temperature acquisition circuit is used for acquiring the temperature of cooling liquid in the liquid cooling heat dissipation system, and the MCU unit adjusts the rotating speed of the direct-current fan and / or the pressure of a water pump in the liquid cooling heat dissipation system according to the acquired temperature of the cooling liquid. The liquid cooling control panel provided by the utility model can independently control and monitor the liquid cooling heat dissipation system of the large-power charging pile in real time, so that the reliability and the stability of the liquid cooling heat dissipation system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-power charging pile heat dissipation, in particular to a control board applied to a liquid cooling system. Background Art

[0002] With the increasing popularity of new energy electric vehicles, the demand for charging piles is also increasing, especially the demand for high-power charging piles (also known as super fast charging) is becoming more and more vigorous. Super fast charging has become the key development direction of charging pile enterprises in recent years.

[0003] In the heat dissipation system of super fast charging piles, the traditional air-cooled heat dissipation method has low heat dissipation efficiency, high noise, and is easy to accumulate dust and block the air path, resulting in poor heat dissipation, and needs to be cleaned regularly. In contrast, the liquid cooling heat dissipation method has the characteristics of high heat dissipation efficiency and low noise. However, liquid cooling heat dissipation requires real-time monitoring and control of multiple parameters such as the temperature, flow rate, flow velocity, power supply, and fault handling of multiple heat dissipation systems. Therefore, there is an urgent need for an intensive and efficient control method to ensure the reliability and stability of the liquid cooling system. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, a control board applied to a liquid cooling system is proposed.

[0005] A control board applied to a liquid cooling system, characterized in that the control board is applied to a high-power charging pile, is connected to the liquid cooling system of the high-power charging pile, and communicates with the charging control module of the high-power charging pile through the RS485 bus;

[0006] The control board includes an MCU unit, and an RS485 communication circuit, a PWM output and motor feedback circuit, and a temperature acquisition circuit that are directly or indirectly connected to the MCU unit;

[0007] Among them, the PWM output and motor feedback circuit is used to control the rotation speed of the DC motor in the high-power charging pile and detect the operating state of the DC motor;

[0008] The temperature acquisition circuit is used to obtain the coolant temperature in the liquid cooling system, and the MCU unit adjusts the rotation speed of the DC fan of the radiator in the high-power charging pile and / or the pressure of the water pump in the liquid cooling system according to the obtained coolant temperature.

[0009] Preferably, the temperature acquisition circuit has multiple temperature measurement interfaces, and the temperature measurement interfaces are used to externally connect temperature sensors.

[0010] Preferably, the PWM output and motor feedback circuit has multiple PWM wave outputs for controlling the rotation speed of the DC motor in the high-power charging pile; the PWM output and motor feedback circuit also has multiple rotation speed feedback input signals with selectable levels for detecting the operating state of the DC motor.

[0011] Preferably, the RS485 communication circuit includes 1 non-isolated RS485 communication interface for communicating with any one or more of an external pressure transmitter, electromagnetic flowmeter, and liquid level sensor; the RS485 communication circuit also includes 2 isolated RS485 communication interfaces, one of which is for communicating with the charging control module and the other is for communicating with the frequency converter in the high-power charging pile.

[0012] Preferably, it also includes multiple current loop detections for external sensors of the output current loop.

[0013] Preferably, it also includes 2 220V AC output switches for supplying power to the frequency converter and the water pump respectively.

[0014] Preferably, it also includes multiple digital input for detecting the liquid level of the coolant.

[0015] Preferably, it also includes multiple relay isolation outputs for controlling reserved expansion function items.

[0016] Preferably, it also includes 1 non-isolated DC power output for supplying power to external sensors; the external sensors include any one or more of a temperature sensor, a liquid level sensor, and a current loop sensor.

[0017] Preferably, it also includes a DIP switch with a preset number of digits.

[0018] The control board (abbreviated as liquid cooling control board) for the liquid cooling and heat dissipation system provided by the present invention can independently perform real-time control and monitoring on the liquid cooling and heat dissipation system of the entire high-power charging pile, thereby improving the reliability and stability of the liquid cooling and heat dissipation system, and having the following advantages:

[0019] 1) This liquid cooling control board communicates with the charging control module through the RS485 bus, and transmits various parameter indicators of the operation of the liquid cooling and heat dissipation system (such as the inlet and outlet temperatures of the coolant waterway; the working temperature of the charging module, the coolant flow rate, pressure, liquid level and other parameters) to the charging control module in real time, reducing the parallel monitoring and control requirements of the charging control module, and at the same time supporting the monitoring and control of multiple liquid cooling and heat dissipation systems. That is, this liquid cooling control board and the charging control module together can form a closed-loop monitoring and control of the liquid cooling and heat dissipation system of the entire charging pile, greatly improving the stability and reliability of the operation of the entire high-power charging pile.

[0020] 2) By monitoring the coolant temperature in real time, the rotation speed of the DC fan of the radiator is adjusted in real time. When the charging pile is not charging, the DC fan operates at a low speed, achieving noise reduction and energy saving; when charging, by monitoring the coolant temperature, the rotation speed of the DC fan of the radiator is adjusted in real time; at the same time, the pressure of the water pump is adjusted to accelerate the circulation of the coolant and dissipate the coolant temperature in time, so that the operating temperature of the high-power charging pile is controlled within the allowable range.

[0021] 3) This liquid cooling control board communicates with external pressure transmitters, electromagnetic flowmeters, and liquid level sensors through the RS485 interface, and transmits the data such as water pressure, flow rate, and coolant water level monitored by the pressure transmitter, electromagnetic flowmeter, and liquid level sensor to the charging control module in real time. The charging control module adjusts and controls the working state of the charging pile according to the current parameters, monitors whether there is a fault in the liquid cooling system in real time, and reports the operating situation of the liquid cooling system to the charging management platform. When there is a fault in the liquid cooling system, the charging behavior will be stopped and the after-sales personnel will be notified, so as to ensure the safety and reliability of the entire charging pile and achieve intelligent perception.

[0022] 4) It detects and supports external temperature sensors (such as PT1000, NTC10K) and current loop detection sensors, with strong compatibility.

[0023] 5) By controlling the 220V AC output switch through 2 channels, when there are faults in the frequency converter and water pump, it can automatically cut off the power, ensuring the safety and reliability of the entire system and reducing the occurrence of safety electricity use accidents.

[0024] 6) It provides 1 non-isolated DC power output to supply working power for external sensors. Description of the Drawings

[0025] Figure 1 It is the schematic diagram of the RS485 communication circuit in the control board applied to the liquid cooling system in the embodiment of the present invention;

[0026] Figure 2 It is the schematic diagram of the PWM output and motor feedback circuit in the control board applied to the liquid cooling system in the embodiment of the present invention;

[0027] Figure 3 It is the schematic diagram of the temperature acquisition circuit in the control board applied to the liquid cooling system in the embodiment of the present invention;

[0028] Figure 4 It is the schematic diagram of the implementation of the DIP switch in the control board applied to the liquid cooling system in the embodiment of the present invention;

[0029] Figure 5 It is the schematic diagram of the implementation of the MCU unit in the control board applied to the liquid cooling system in the embodiment of the present invention. Detailed implementation mode

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0031] Provide a control board applied to a liquid cooling system, such as Figures 1 to 5 As shown, the control board is applied to a high-power charging pile, is connected to the liquid cooling system of the high-power charging pile, and communicates with the charging control module of the high-power charging pile through the RS485 bus.

[0032] The control board includes an MCU unit, and an RS485 communication circuit, a PWM output and motor feedback circuit, and a temperature acquisition circuit that are directly or indirectly connected to the MCU unit. Further, it also includes a DIP switch with a preset number of digits. Among them, the PWM output and motor feedback circuit are used to control the speed of the DC motor in the high-power charging pile and detect the operating state of the DC motor; the temperature acquisition circuit is used to obtain the coolant temperature in the liquid cooling system, and the MCU unit adjusts the speed of the DC fan of the radiator in the high-power charging pile and / or the pressure of the water pump in the liquid cooling system according to the obtained coolant temperature.

[0033] In one implementation, the liquid cooling control board specifically includes:

[0034] 1) 2-way PWM wave output, used to control the speed of the DC motor;

[0035] 2) 4-way speed feedback input signals with selectable levels, used to detect the operating state of the DC motor;

[0036] 3) 7-way temperature measurement, through an external PT1000 or NTC10K temperature sensor, used to measure the temperature of the inlet and outlet of the cooling water circuit in the liquid cooling system and the temperature of the pile body environment;

[0037] 4) 2-way digital input, used for coolant level detection,

[0038] 5) 2-way relay isolated output, used for controlling extended functions;

[0039] 6) 2-way current loop detection, used for sensors of external output current loops;

[0040] 7) 2-way control of 220V AC output switches, used for power supply of inverters and water pumps powered by mains electricity;

[0041] 8) 1-way non-isolated 12V power output; used to provide working power for external sensors;

[0042] 9) A non-isolated RS485 communication interface for communication with pressure transmitters, electromagnetic flowmeters, and liquid level sensors.

[0043] 10) Two isolated RS485 communication interfaces, one for communicating with the "charging control module" and one for communicating with the "frequency converter".

[0044] 11) A 6-bit DIP switch. The first bit is used to identify the fan speed mode RD / FG; the second bit is used to identify the access of PT1000 / NTC10K; the third and fourth bits are for selecting the address of the liquid cooling control board, supporting multiple liquid cooling control boards to be controlled by one "charging control module" simultaneously; the fifth and sixth bits are for other functions and are reserved.

[0045] In the RS485 communication circuit as Figure 1 shown, its principle is as follows: U3 is an isolated power supply module for isolating the RS485 power supply from the main control MCU processor power supply. Among them, 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 isolate the RS485 power supply from the main control MCU processor.

[0046] U2 is an RS485 communication chip, and U1 is a digital isolation chip for isolating the main control MCU processor signal. Among them, GDT1 is for lightning protection of the RS485 bus, and ESD14, ESD15, and ESD16 are for electrostatic protection of RS485. Q1, R7, and R13 form an automatic switching of RS485 transceiver signals. The network P74 - RXD and P31 - TXD are connected to the UART serial port communication of the main control MCU processor.

[0047] In the PWM output and motor feedback circuit as Figure 2 shown, only one PWM pulse output and feedback circuit are shown, and the other three are the same. Its principle is as follows: U4 and the peripheral circuit form a buck circuit, and the VCC output voltage determines the amplitude of the PWM output voltage. Among them, J1 is for selecting different voltage outputs. When pins 1 - 2 are shorted, the VCC output voltage is 5V; when pins 1 - 2 are shorted, the VCC output voltage is 10V. ESD18 is for electrostatic protection, and F2 is for output short - circuit protection or overload protection.

[0048] U8 is an isolated digital chip for PWM pulse output, which is used to isolate the DC motor control signal from the MUC processor to enhance the anti-interference ability. The network P10-PWMO00 is the PWM pulse signal output by the MCU processor. After passing through the isolated digital chip, the PWM0 pulse signal is output, and after being divided by the resistor R52, it is input to the base of the N4 digital triode. N4 is used for the level conversion of the PWM pulse output. The amplitude of the PWM output voltage is determined by the VCC voltage; B0 is the output of the motor speed feedback signal, R69 is the upper connecting resistor of the fan feedback signal, and the motor speed feedback signal passes through the R70 and C60 filter circuits and is input to the input pin of the digital isolation chip. After isolation, it is input to the MCU processing pin P136-INTP0 for the motor output speed test and the main motor fault detection.

[0049] In the Figure 3 temperature acquisition circuit shown as follows, its principle is: Q3 is a reference voltage chip, which provides an accurate reference voltage for the AD acquisition. R24 is a current-limiting resistor, and C15 and C16 form a reference voltage filter circuit. T+-T- is an externally connected PT1000, which is a test resistor. It is converted into a voltage through the R25 and R28 voltage-dividing resistors and input to the MCU processor for ADC value acquisition. Thus, the temperature value can be calculated. Among them, ESD6, ESD24, and ESD5 form an electrostatic protection circuit. R26, C14, and C17 form a low-pass filter circuit, and P15-AN17 is input to the AD sampling pin of the MCU processor.

[0050] In the Figure 4 dip switch implementation shown as follows, a 4-bit dip switch SW1 is configured. The resistors R23, R71, R72, and R74 are connected to VCC3_8 to provide an upper connection for the input level of the processor GPIO pin. Among them, switch 1 is used to identify the external fan feedback type by software. "1" represents the FG mode, and "0" represents the RD mode to adapt to two different types of fan speed feedback signals in the market. Switches 2-4 are used for the RS485 address allocation of this control board to support the parallel connection of multiple DC fan control boards.

[0051] In the Figure 5 schematic diagram of the MCU unit shown as follows, the processor selects an 8-bit MO core processor from MicroPort. The indicator light is directly driven by the MUC GPIO pin (P147) through the current-limiting resistor R35 to make the LED1 emit light, which can indicate the operation status of the control board in real time. For example, it lights up for 0.5 seconds and goes out for 0.5 seconds during normal operation, and lights up constantly when there is a fault.

[0052] The above is an elaboration on the control board of the present utility model applied to the liquid cooling system, which is used to help understand the present utility model; however, the implementation mode of the present utility model is not limited by the above embodiments. Any changes, modifications, substitutions, combinations, and simplifications made without departing from the principle of the present utility model shall be equivalent replacement methods and are all included in the protection scope of the present utility model.

Claims

1. A control board applied to a liquid cooling system, characterized in that, The control board is applied to a high-power charging pile, connected to the liquid cooling system of the high-power charging pile, and communicates with the charging control module of the high-power charging pile through the RS485 bus; The control board includes an MCU unit, and an RS485 communication circuit, a PWM output and motor feedback circuit, and a temperature acquisition circuit that are directly or indirectly connected to the MCU unit; Among them, the PWM output and motor feedback circuit is used to control the rotation speed of the DC motor in the high-power charging pile and detect the operating state of the DC motor; The temperature acquisition circuit is used to obtain the coolant temperature in the liquid cooling system, and the MCU unit adjusts the rotation speed of the DC fan of the radiator in the high-power charging pile and / or the pressure of the water pump in the liquid cooling system according to the obtained coolant temperature.

2. The control board applied to the liquid cooling system according to claim 1, characterized in that The temperature acquisition circuit has multiple temperature measurement interfaces, and the temperature measurement interfaces are used to externally connect temperature sensors.

3. The control board applied to the liquid cooling system according to claim 1, characterized in that, The PWM output and motor feedback circuit has multiple PWM wave outputs for controlling the rotation speed of the DC motor in the high-power charging pile; the PWM output and motor feedback circuit also has multiple rotation speed feedback input signals with selectable levels for detecting the operating state of the DC motor.

4. The control board applied to the liquid cooling system according to claim 1, characterized in that, The RS485 communication circuit includes 1 non-isolated RS485 communication interface for communicating with any one or more of an external pressure transmitter, electromagnetic flowmeter, and liquid level sensor; the RS485 communication circuit also includes 2 isolated RS485 communication interfaces, one of which is used to communicate with the charging control module, and the other is used to communicate with the frequency converter in the high-power charging pile.

5. The control board applied to the liquid cooling system according to claim 1, characterized in that, It also includes multiple current loop detections for externally connecting sensors of the output current loop.

6. The control board applied to the liquid cooling system according to claim 4, characterized in that, It also includes 2 220V AC output switches for supplying power to the frequency converter and the water pump respectively.

7. The control board applied to the liquid cooling system according to claim 1, characterized in that, It also includes multiple digital input for detecting the liquid level of the coolant.

8. The control board applied to the liquid cooling system according to claim 1, characterized in that, It also includes multiple relay isolation outputs for controlling reserved expansion function items.

9. The control board applied to the liquid cooling system according to claim 1, characterized in that, It also includes 1 non-isolated DC power output for supplying power to external sensors; the external sensors include any one or more of temperature sensors, liquid level sensors, and current loop sensors.

10. The control board applied to the liquid cooling system according to any one of claims 1 to 9, characterized in that, It also includes a DIP switch with a preset number of digits.

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