CN110758148A - Heat dissipation control device and control method for high-power direct-current charging pile - Google Patents
Heat dissipation control device and control method for high-power direct-current charging pile Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
- B60L53/302—Cooling of charging equipment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a heat dissipation control device for a high-power direct-current charging pile, which comprises: the controller performs analog-to-digital conversion on an analog signal acquired by the temperature sensor and performs frequency conversion and speed regulation control on the direct current fan according to temperature change; the temperature sensor detects the real-time temperature inside the direct current charging pile, and the change of the real-time temperature is used as a feedback quantity to control the rotating speed of the direct current fan; and the optical coupling isolation module is used for converting an output signal of the controller into an input signal of the direct current fan driving module. The invention also relates to a heat dissipation control method of the high-power direct current charging pile. The invention overcomes the defect that the alternating current motor always runs at the rated rotating speed, and reduces the power consumption and the economic cost; the structure is simple, the cost investment is low, and the large-scale popularization and application are easy; when charging pile heat abstractor goes wrong, the feedback that can be timely is carried out and the maintenance is carried out.
Description
Technical Field
The invention belongs to the technical field of direct current charging piles, and particularly relates to a heat dissipation control device and a heat dissipation control method for a high-power direct current charging pile.
Background
High-power direct current fills electric pile can produce a large amount of heats in the course of the work, if these heats discharge in time, can lead to direct current to fill electric pile output and reduce. Direct current on the existing market fills electric pile and utilizes the fan to dispel the heat usually, and wherein the motor of fan is alternating current motor mostly, and fills electric pile working process alternating current motor and move under rated revolution always. This kind of design has great defect, and alternating current motor can't adjust alternating current motor's rotational speed according to the change of filling electric pile inside temperature in the course of the work, therefore heat dissipation controlling means produces great consumption in the course of the work.
In view of the above, research and design of a heat dissipation device for a dc charging pile of an electric vehicle and a heat dissipation control method thereof, which can overcome the above disadvantages, are problems to be solved by vehicle accessory manufacturing enterprises at present.
Disclosure of Invention
In order to solve the technical problems, the invention provides a heat dissipation control device and a heat dissipation control method for a high-power direct current charging pile. The technical scheme adopted by the invention is as follows:
the utility model provides a high-power direct current fills electric pile heat dissipation controlling means, includes: the temperature sensor, the controller, the optical coupling isolation module, the direct current fan driving module and the direct current fan are sequentially connected and form a closed loop, the controller performs analog-to-digital conversion on analog signals collected by the temperature sensor and performs frequency conversion and speed regulation control on the direct current fan according to temperature changes; the temperature sensor detects the real-time temperature inside the direct current charging pile and controls the rotating speed of the direct current fan by taking the change of the real-time temperature as a feedback quantity; the optical coupling isolation module is used for isolating an output signal of the controller from an input end of the direct current fan driving module and converting the output signal of the controller into an input signal of the direct current fan driving module; the direct current fan driving module is used for amplifying a signal output by the controller to be enough to drive the direct current fan; the direct current fan reduce the inside temperature of direct current charging pile through rotating.
A heat dissipation control method for a high-power direct-current charging pile comprises the following steps:
s1, in the high-power direct-current charging pile, real-time acquisition of the temperature of the direct-current charging pile is achieved by using a temperature sensor;
s2, inputting the analog signal output by the temperature sensor into the controller, converting the analog signal into a real-time temperature value of a digital signal, performing deviation processing on the real-time temperature value and the optimal temperature of the operation of the charging pile, performing PI operation, and outputting the duty ratio of a PWM signal for frequency conversion control of the direct current fan;
s3, converting the PWM signal output by the controller into a PWM signal for a direct current fan driving module through an optical coupling isolation module;
s4, after the direct current fan is driven by the direct current fan driving module, the direct current fan achieves frequency conversion and speed regulation, and the rotating speed of the direct current fan is adjusted in real time according to the change of the internal temperature of the charging pile.
The invention has the beneficial effects that:
1) the invention automatically adjusts the rotating speed according to the temperature change through the direct current fan, overcomes the defect that the alternating current motor always runs at the rated rotating speed, and reduces the power consumption and the economic cost.
2) The invention has simple structure, low cost investment and easy large-scale popularization and application.
3) The invention uses 485 communication, and when the charging pile heat dissipation device has a problem, the feedback can be timely carried out, and the maintenance can be carried out.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are specific embodiments of the invention, and that other drawings within the scope of the present application can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic structural diagram of a heat dissipation control device of a high-power direct-current charging pile according to an embodiment of the invention;
fig. 2 is a schematic control principle diagram of a charging pile heat dissipation control device according to an embodiment of the invention;
FIG. 3a is a schematic diagram of a first isolation circuit of the opto-isolator module according to an embodiment of the present invention;
FIG. 3b is a schematic diagram of a second isolation circuit of the opto-isolator module according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a DC fan drive module according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a 485 communication module according to an embodiment of the invention;
fig. 6 is a flowchart of heat dissipation control of the high-power dc charging pile according to the embodiment of the present invention.
The specific implementation mode is as follows:
embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a heat dissipation control device for a high-power dc charging pile according to an embodiment of the present invention. The invention provides a heat dissipation control device for a high-power direct current charging pile, which comprises: the temperature sensor, controller, opto-coupler isolation module, direct current fan drive module, direct current fan that connect gradually in proper order and form a closed circuit, the main function of controller be: analog-to-digital conversion is carried out on the analog signals collected by the temperature sensor, and frequency conversion and speed regulation control are carried out on the direct current fan according to temperature change. The direct current fan can reduce the temperature inside the direct current charging pile through rotation; the temperature sensor detects the real-time temperature inside the direct current charging pile, and the change of the real-time temperature is used as a feedback quantity to control the rotating speed of the direct current fan. The optical coupling isolation module is used for isolating the output signal of the controller from the input end of the direct current fan driving module and converting the output signal of the controller into the input signal of the direct current fan driving module. The direct current fan driving module is used for amplifying the signal output by the controller to be enough to drive the direct current fan. In addition, the controller is connected with the control center to realize data interaction, when the heat dissipation control device has a fault, the controller can send a signal needing to be overhauled to the control center, and the communication mode between the controller and the control center includes but is not limited to 485 communication. In the embodiment of the invention, the controller of the heat dissipation control device and the charging pile control center transmit information through 485 communication, when the heat dissipation module breaks down, the controller transmits a signal to the control center through 485 communication, and the control center sends an alarm.
The controller mainly comprises a programmable control chip, the most common control chips at present comprise 51 series, STM32 series and DSP chips, and the control chip used in the embodiment of the invention is STM32F103RET 6. Setting the optimal operating temperature of the direct current charging pile in an STM32 chip; and a PI rotating speed regulator is arranged in the STM32 chip and is used for outputting the duty ratio of a PWM signal according to the deviation value of the optimal temperature and the real-time temperature value acquired by the temperature sensor. The controller mainly has the functions of performing analog-to-digital conversion on an analog signal of the temperature by using an internal AD (analog-to-digital) of an STM32 chip, performing frequency conversion and speed regulation on the direct current fan and performing information interaction with a charging pile control center; the above functions of the controller are all implemented in the STM32 chip programming. The optimal temperature of direct current charging pile operation is set in the program of STM32 chip, and the temperature that will temperature sensor gathered and optimal temperature do the deviation calculation. The variable frequency speed regulation of the direct current fan is realized by making deviation according to the optimal temperature set in a program and a value acquired by a temperature sensor, and transmitting the deviation to a PI (proportional integral) rotating speed regulator written in the program to output a PWM (pulse width modulation) signal.
In the control chip, the method for programming the PI speed regulator is prior art and will not be described in detail here.
Fig. 2 is a schematic diagram illustrating a control principle of the charging pile heat dissipation control device according to the embodiment of the present invention. The optimal temperature of the operation of the high-power direct-current charging pile is a given value, a real-time temperature signal measured by a temperature sensor in the charging pile is a feedback value, the deviation between the optimal temperature given value and the real-time temperature feedback value is input into a PI (proportional integral) rotating speed regulator, the PI rotating speed regulator outputs a PWM (pulse width modulation) signal to a direct-current motor driving module to control the rotating speed of a direct-current fan, the rotating speed of the direct-current fan is increased, the temperature in the charging pile can be reduced, and the power consumption can be reduced by reducing the rotating speed of the direct-current.
Because the PWM signal that the controller output can't direct drive direct current fan, consequently used direct current fan drive module. The driving circuit of the direct current fan driving module plays a role in power amplification and is used for amplifying the PWM pulse output by the controller control circuit to be enough to drive the power transistor switch.
The invention adjusts the rotating speed of the direct current fan by changing the duty ratio of PWM, because the PWM signal output by the controller can not be directly connected with the input end of the direct current fan driving module, the DC fan driving module needs to be isolated by the optical coupling isolation module, and the optical coupling isolation module comprises two groups of mutually independent first isolation circuits and second isolation circuits with the same structure. The optical coupling isolation module is used for isolating the PWM signal in the controller from the drive control signal of the drive module. Fig. 3a is a schematic diagram of a first isolation circuit of the optical coupler isolation module according to the embodiment of the present invention; fig. 3b is a schematic diagram of a second isolation circuit of the optical coupler isolation module according to the embodiment of the present invention.
In the first isolation circuit, one end of a resistor R1 is connected with 2 pins of an optocoupler chip U1, and the other end is connected with a power supply VCC3.3, two ends of a resistor R2 are respectively connected with 6 pins and 8 pins of the optocoupler chip U1, two ends of a capacitor C1 are respectively connected with 5 pins and 8 pins of the optocoupler chip U1, a PWM signal output by a controller is input to 3 pins of the optocoupler chip U1, and 6 pins of the optocoupler chip U1 output the isolated PWM signal to a direct current fan driving module (driving chip). The power supply of the optocoupler chip U1 is divided into two groups of power supplies which are not on the same ground, namely VCC3.3 and VCC 5V; the optical coupler chip U1 can adopt 6N137, and the transmission rate of the optical coupler chip can reach ns level.
In the second isolation circuit, include: the circuit structure of the resistor R3, the resistor R4, the capacitor C2, and the optocoupler isolation chip U2 is substantially the same as that of the first isolation circuit, and is not described herein.
The output PWM of the controller, namely the input PWM of the optical coupling isolation module is called IPWM, and the amplitude of the voltage is 3.3V; the input PWM of the direct current fan driving module, namely the output PWM of the optical coupling isolation module, is called OPWM, and the amplitude of the voltage is 5V. In order to ensure the stability of the charging pile heat dissipation device, the controller and the driving module are isolated by the optical coupling isolation module, the optical coupling isolation module is used for isolating the controller (single chip microcomputer) from the direct current fan driving module (driving chip), and simultaneously, the amplitude of the PWM signal is increased from 3.3V to 5V.
Fig. 4 is a schematic circuit diagram of a dc fan driving module according to an embodiment of the present invention. PWM signals OPWM1 and OPWM2 transmitted from the optical coupling isolation module are transmitted to the direct current fan driving module; the direct current fan driving module comprises a resistor R5, a resistor R6, a capacitor C3, a capacitor C4 and a motor driving chip U3 and is used for driving the direct current fan.
The resistor R5 and the resistor R6 are connected in parallel, one end of the resistor R5 is connected with a 7 pin of the motor driving chip U3, and the other end of the resistor R6 is grounded; the power of the resistor R5 and the resistor R6 needs to reach 1W to meet the requirement of the driving circuit. The capacitor C3 and the capacitor C4 are connected in parallel, one end of the capacitor C3 and the other end of the capacitor C4 are connected with the 5 pin of the driving chip U3, and the other end of the capacitor C3 and the other end of the capacitor C4 are grounded; the role of these two capacitors is VCC24V supply filtering. The 6 pin and the 8 pin of the motor driving chip U3 are respectively used for outputting PWM1 and PWM2, and the power supply of the motor driving chip U3 is VCC 5V; the motor driving chip can adopt DRV8870, and the peak current driving capacity of the chip can reach 3.6A.
Fig. 5 is a schematic circuit diagram of a 485 communication module according to an embodiment of the present invention. When a fault occurs in the operation process of the heat dissipation control device, 485 communication is adopted between a controller and a control center of the heat dissipation control device, and the 485 communication module comprises a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a 485 chip U4, a diode U5, a voltage isolation module U6 and a triode V1 and is used for 485 communication between the controller and the control center.
The 485 chip U4 can adopt a chip ISO3082DWR with an isolation function, wherein a 1 pin of U4 is VCC3.3, and 2, 7 and 8 pins of U4 are grounded PGND; the power supply of the 16 pins of the chip U4 is VEE5V2, and the 9, 10 and 15 pins of U4 are grounded to GND 2. The 3 pin of U4 is connected to UART1_ RX and then to one end of resistor R10, and the other end of resistor R10 is connected to VCC 3.3. The resistor R7 and the resistor R8 are connected in series, the middle of the two resistors is connected with the UART1_ TX, one end of the two resistors is connected with the base electrode of the triode V1, and the other end of the two resistors is connected with VCC 3.3. The emitter of the triode V1 is connected with VCC3.3, and the collector is connected with pins 4 and 5 of the 485 chip U4. One end of the resistor R9 is connected to the 4 and 5 pins of U4, and the other end is connected to PGND. The 6 pin of the chip U4 is connected to UART1_ TX. 2 pins of the resistor R11, the resistor R13 and the diode U5 are all connected with 13 pins of the chip U4; the resistor R11 is connected with GND2, the resistor R13 is connected with 485B, and the 3 pin of the diode U5 is connected with GND 2. The 1 pin of the resistor R12, the resistor R14 and the diode U5 are all connected with the 12 pins of the chip U4; the resistor R12 is connected with VEE5V2, and the resistor R14 is connected with 485A. The isolation power module U6 can adopt a golden sun-shading isolation power module F0505S-1WR2, a capacitor C5, a capacitor C6, a capacitor C7 and a capacitor C8 as filter capacitors at two sides of the isolation power.
Fig. 6 is a flowchart illustrating a heat dissipation control process of the high-power dc charging pile according to an embodiment of the present invention. A heat dissipation control method for a high-power direct-current charging pile specifically comprises the following four steps:
s1, in the high-power direct-current charging pile, the temperature sensor is used for achieving real-time collection of the temperature of the direct-current charging pile, and the temperature signal output by the temperature sensor is an analog signal.
And S2, inputting the analog signal output by the temperature sensor into the controller, converting the analog signal into a real-time temperature value of a digital signal to obtain a temperature value inside the current direct-current charging pile, performing deviation processing on the temperature value and the optimal operating temperature of the charging pile, performing PI operation, and outputting the duty ratio of a PWM signal for frequency conversion control of the direct-current fan. The best temperature of supposing to fill electric pile operation is 60 degrees centigrade, when filling the inside real-time temperature of electric pile and being higher than 60 degrees centigrade, do the deviation with two temperatures and handle to carry out PI operation, promptly: the temperature deviation value is input into the PI rotating speed regulator, proportional and integral operation is carried out on the temperature deviation, the duty ratio of the PWM signal is output, and the rotating speed of the direct current fan is faster and faster along with the increase of the temperature. When the temperature is reduced to below 60 ℃, the direct current fan stops rotating, frequency conversion control of the direct current fan is achieved, and power consumption of the heat dissipation control device is effectively reduced.
And S3, converting the PWM signal output by the controller into a PWM signal for the direct current fan driving module through the optical coupling isolation module. In order to isolate the PWM signal output by the controller (singlechip) from the input signal of the direct current fan driving module (driving chip), the chip 6N137 is used for optical coupling isolation. The two sides of the chip 6N137 use power supplies which are not in common with the ground, and the amplitude of the PWM signal is pulled up to 5V from 3.3V. The input signal of the direct current fan motor driving chip DRV8870 is two paths of PWM signals with the amplitude of 5V, the motor driving chip drives the direct current fan, and the peak value of the driving current can reach 3.6A.
S4, after the direct current fan is driven by the direct current fan driving module, the direct current fan achieves variable frequency speed regulation, when the temperature in the charging pile is reduced, the temperature collected by the temperature sensor is transmitted to the controller, and the controller judges to reduce the rotating speed of the direct current fan at the moment.
Finally, it is to be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the scope of the present invention is not limited thereto. Those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (10)
1. The utility model provides a high-power direct current fills electric pile heat dissipation controlling means which characterized in that includes: the temperature sensor, the controller, the optical coupling isolation module, the direct current fan driving module and the direct current fan are sequentially connected and form a closed loop, the controller performs analog-to-digital conversion on analog signals collected by the temperature sensor and performs frequency conversion and speed regulation control on the direct current fan according to temperature changes; the temperature sensor detects the real-time temperature inside the direct current charging pile and controls the rotating speed of the direct current fan by taking the change of the real-time temperature as a feedback quantity; the optical coupling isolation module is used for isolating an output signal of the controller from an input end of the direct current fan driving module and converting the output signal of the controller into an input signal of the direct current fan driving module; the direct current fan driving module is used for amplifying a signal output by the controller to be enough to drive the direct current fan; the direct current fan reduce the inside temperature of direct current charging pile through rotating.
2. The heat dissipation control device for the high-power direct-current charging pile according to claim 1, wherein the controller is a programmable control chip, and includes but is not limited to: series 51, series STM32, and DSP chips.
3. The heat dissipation control device for the high-power direct-current charging pile according to claim 2, wherein the control chip is an STM32F103RET6, and the optimal temperature for the operation of the direct-current charging pile is set in an STM32 chip; and a PI rotating speed regulator is arranged in the STM32 chip and is used for outputting the duty ratio of a PWM signal according to the deviation value of the optimal temperature and the real-time temperature value acquired by the temperature sensor.
4. The heat dissipation control device for the high-power direct-current charging pile according to claim 1, wherein the optical coupling isolation module comprises two groups of mutually independent first isolation circuits and second isolation circuits with the same structure.
5. The heat dissipation control device for the high-power direct-current charging pile according to claim 4, wherein in the first isolation circuit, one end of a resistor R1 is connected with a pin 2 of an optocoupler chip U1, the other end of the resistor R1 is connected with a power supply VCC3.3, two ends of a resistor R2 are respectively connected with a pin 6 and a pin 8 of the optocoupler chip U1, two ends of a capacitor C1 are respectively connected with a pin 5 and a pin 8 of the optocoupler chip U1, a PWM signal output by the controller is input to a pin 3 of the optocoupler chip U1, and the pin 6 of the optocoupler chip U1 outputs the isolated PWM signal to the direct-current fan driving module; the power supply of the optocoupler chip U1 is divided into two groups of power supplies which are not on the same ground, namely VCC3.3 and VCC 5V; the optical coupling chip U1 can adopt 6N 137;
the second isolation circuit includes: the circuit structure of the circuit is the same as that of the first isolation circuit, and the circuit structure of the circuit comprises a resistor R3, a resistor R4, a capacitor C2 and an optical coupling isolation chip U2.
6. The heat dissipation control device for the high-power direct-current charging pile according to claim 1, wherein the direct-current fan driving module comprises a resistor R5, a resistor R6, a capacitor C3, a capacitor C4 and a motor driving chip U3;
the resistor R5 and the resistor R6 are connected in parallel, one end of the resistor R5 is connected with a 7 pin of the motor driving chip U3, and the other end of the resistor R6 is grounded; the capacitor C3 and the capacitor C4 are connected in parallel, one end of the capacitor C3 and the other end of the capacitor C4 are connected with the 5 pin of the driving chip U3, and the other end of the capacitor C3 and the other end of the capacitor C4 are grounded; the 6 pin and the 8 pin of the motor driving chip U3 are respectively used for outputting PWM1 and PWM2, and the power supply of the motor driving chip U3 is VCC 5V; the motor driver chip U3 employs DRV 8870.
7. The heat dissipation control device for the high-power direct-current charging pile according to any one of claims 1 to 6, wherein the controller is connected with a control center to realize data interaction, and the communication mode between the controller and the control center includes but is not limited to 485 communication.
8. The heat dissipation control device for the high-power direct-current charging pile according to claim 7, wherein 485 communication is achieved through a 485 communication module, and the 485 communication module comprises a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a 485 chip U4, a diode U5, a voltage isolation module U6 and a triode V1;
the 485 chip U4 adopts a chip ISO3082DWR with an isolation function, wherein a power supply of a pin 1 of U4 is VCC3.3, and pins 2, 7 and 8 of U4 are grounded PGND; the power supply of a 16-pin power supply of the chip U4 is VEE5V2, and 9, 10 and 15 pins of U4 are grounded to GND 2;
the 3 pin of U4 is connected to UART1_ RX and then to one end of resistor R10, and the other end of resistor R10 is connected to VCC 3.3; the resistor R7 and the resistor R8 are connected in series, the middle of the two resistors is connected with UART1_ TX, one end of the two resistors is connected with the base electrode of the triode V1, and the other end of the two resistors is connected with VCC 3.3; an emitter of the triode V1 is connected with VCC3.3, and a collector of the triode V1 is connected with pins 4 and 5 of the 485 chip U4; one end of the resistor R9 is connected with pins 4 and 5 of the U4, and the other end is grounded PGND; the 6 pin of the chip U4 is connected with UART1_ TX; 2 pins of the resistor R11, the resistor R13 and the diode U5 are all connected with 13 pins of the chip U4; the resistor R11 is connected with GND2, the resistor R13 is connected with 485B, and the 3 pin of the diode U5 is connected with GND 2; the 1 pin of the resistor R12, the resistor R14 and the diode U5 are all connected with the 12 pins of the chip U4; the resistor R12 is connected with VEE5V2, and the resistor R14 is connected with 485A.
9. A heat dissipation control method for a high-power direct-current charging pile is characterized by comprising the following steps:
s1, in the high-power direct-current charging pile, real-time acquisition of the temperature of the direct-current charging pile is achieved by using a temperature sensor;
s2, inputting the analog signal output by the temperature sensor into the controller, converting the analog signal into a real-time temperature value of a digital signal, performing deviation processing on the real-time temperature value and the optimal temperature of the operation of the charging pile, performing PI operation, and outputting the duty ratio of a PWM signal for frequency conversion control of the direct current fan;
s3, converting the PWM signal output by the controller into a PWM signal which can be used for a direct current fan driving module through the optical coupling isolation module;
s4, after the direct current fan is driven by the direct current fan driving module, the direct current fan achieves frequency conversion and speed regulation, and the rotating speed of the direct current fan is adjusted in real time according to the change of the internal temperature of the charging pile.
10. The heat dissipation control method for the high-power direct-current charging pile according to claim 9, wherein the PI operation is performed by: and inputting the temperature deviation value into a PI rotating speed regulator, carrying out proportional and integral operation on the temperature deviation, and outputting the duty ratio of a PWM signal.
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| CN111391684A (en) * | 2020-04-10 | 2020-07-10 | 山东迅风电子有限公司 | Air cooling heat dissipation refined monitoring device and method for direct current charging pile |
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| CN114734847A (en) * | 2022-05-17 | 2022-07-12 | 永联智慧能源科技(常熟)有限公司 | Fan speed regulation control method and related device |
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