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CN112172572A - Charging and charging integrated charging pile system based on low-voltage direct-current power supply technology - Google Patents

Charging and charging integrated charging pile system based on low-voltage direct-current power supply technology Download PDF

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Publication number
CN112172572A
CN112172572A CN202010789060.1A CN202010789060A CN112172572A CN 112172572 A CN112172572 A CN 112172572A CN 202010789060 A CN202010789060 A CN 202010789060A CN 112172572 A CN112172572 A CN 112172572A
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module
charging
voltage
power supply
low
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陈华杰
吕杰
汪敏东
张�杰
李圣江
夏振杰
陈其
吴芳琳
王晓明
赵龙安
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Haining Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Haining Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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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
    • B60L53/31—Charging columns specially adapted for electric vehicles
    • 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
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • 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
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/66—Data transfer between charging stations and vehicles
    • B60L53/665—Methods related to measuring, billing or payment
    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • 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
    • 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
    • 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
    • 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
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

本发明公开了一种基于低压直流供电技术的计充一体化充电桩系统，包括直流充电桩，所述直流充电桩包括电源模块、通信模块、检测模块和充电接口，直流充电桩分别与设备、终端相连。上述技术方案基于现有低压直流供电技术，通过高频变压器和控制板电路以及软件设计形成计充一体化充电桩系统，利用低压电网资源，在现有停车位旁有条件安装的场所广泛安装，进一步盘活电网现有资源，实现提质增效，最大限度地提高充电控制的效果，降低故障发生，提高充电桩运行稳定性。

Figure 202010789060

The invention discloses a meter-charging integrated charging pile system based on low-voltage direct current power supply technology, comprising a direct current charging pile, the direct current charging pile includes a power supply module, a communication module, a detection module and a charging interface, and the direct current charging pile is connected with equipment, connected to the terminal. The above technical solution is based on the existing low-voltage DC power supply technology, through high-frequency transformer and control board circuit and software design to form a meter-charge integrated charging pile system, using low-voltage power grid resources, widely installed in places where there are conditions for installation next to existing parking spaces, Further revitalize the existing resources of the power grid, improve quality and efficiency, maximize the effect of charging control, reduce the occurrence of faults, and improve the operational stability of charging piles.

Figure 202010789060

Description

Charging and charging integrated charging pile system based on low-voltage direct-current power supply technology
Technical Field
The invention relates to the field of low-voltage power supply, in particular to a charging and metering integrated charging pile system based on a low-voltage direct-current power supply technology.
Background
With the gradual improvement of the global economic level, the environmental pollution is more serious and the resources are exhausted, so that the low-carbon and environment-friendly economic development mode becomes the first choice of all countries in the world in order to ensure the development of green economy in China. A series of advantages of high cleanliness of new energy, energy conservation, consumption reduction and the like reduce environmental pollution to a great extent, and the new energy becomes the mainstream of future resource use. The application of new forms of energy promotes the development of auxiliary equipment such as charging station, electric pile that fills. The direct current fills electric pile system and is regarded as the important component of basic unit that charges, and the development of new forms of energy can directly be influenced to the performance of its function. Therefore, the low-voltage direct-current charging pile system has extremely important practical significance for reliable functions, safety and stability and excellent compatibility.
Meanwhile, the traditional charging pile has high power supply requirement, a special line needs to be placed from a public transformer for power supply during power connection, and an independent power distribution control box is arranged. And the on-the-spot installation condition of different electric pile and required power supply distance have great difference toward the past, make power supply enterprise be difficult to control and fill electric pile installation cost, can't the standardized implementation. The characteristics of power supply enterprises need to be combined, power supply points, metering devices, charging control modules and the like are arranged in the charging piles in a centralized mode, connection of intermediate links is reduced, cost is saved, and adaptability is improved.
In recent years, with the development of power electronic technology, technical problems faced by direct current power transmission and distribution are gradually solved, and technical advantages of direct current systems are presented. Compared with an alternating current system, the direct current system can obviously improve the operation level of power transmission and distribution, so that the power transmission and distribution are simpler and more efficient, and the power transmission and distribution cost is reduced.
Chinese patent document CN105048562A discloses a "dc charging pile". The intelligent charging system comprises a charging power supply, an intelligent control module, a direct current charger, a main control module and a direct current load contactor; the intelligent control module comprises a central control unit, a charging unit, a card swiping unit, an energy scheduling unit, a human-computer interface unit, a low-voltage auxiliary unit, a charging protection unit and at least two charging interfaces, wherein the charging unit, the card swiping unit, the energy scheduling unit, the human-computer interface unit and the charging protection unit are in interactive connection with the central control unit, the input end of the low-voltage auxiliary unit is connected with the output end of the central control unit, the output end of the low-voltage auxiliary unit is connected with the input end of a charging interface I, the output end of the charging protection unit is connected with the input end of a charging interface II, the output ends of the charging interface I, the charging interface II and the central control unit are respectively connected with the input end of a direct-current charger through a communication unit, and the output end of the direct. Above-mentioned technical scheme only considers direct current and fills electric pile's charging and disconnection function, does not realize measurement and charging control, and the function is single and there is the potential safety hazard.
Disclosure of Invention
The invention mainly solves the technical problems that the original charging pile only realizes the charging function, has single function and has potential safety hazard, and provides a charging and counting integrated charging pile system based on a low-voltage direct-current power supply technology.
The technical problem of the invention is mainly solved by the following technical scheme: the device comprises a direct current charging pile, wherein the direct current charging pile comprises a power supply module, a communication module, a detection module and a charging interface, and the direct current charging pile is respectively connected with the device and a terminal. The detection module is arranged on the control board under the low-voltage direct-current charging pile, and the requirements of fast charging voltage, fast charging current and the like are met by means of the communication module contained in the equipment, so that the control requirements of the low-voltage direct-current charging pile control board on the output voltage and current of the power supply pack are met.
Preferably, the power module comprises a protection module and a transformation module, and the input end of the transformation module is powered by three-phase five-phase 320V direct current. The function of the protection module is mainly to prevent the integrated system from being damaged by alternating current and strong voltage in a low-voltage direct current circuit; the voltage transformation module is used for safely converting the flowing voltage and current of the low-voltage direct-current power grid, so that safe voltage is provided for the realization of LED driving and circuit control functions.
Preferably, the transformation module comprises a high-frequency transformer, the primary side of the high-frequency transformer has a transformation voltage of 252V, the power of 3KW, the switching frequency of 20KHZ, the frequency of a transformation instrument of 0.9 and the magnetic flux density of 0.16T.
Preferably, the external power of the high-frequency transformer is calculated as:
Figure BDA0002623111060000031
according to the AP method, there are:
Figure BDA0002623111060000032
formula II, K0The use index of a system window is referred, and the value is 0.4; kfThe waveform index is shown, the sine wave value is 4.44, and the square wave value is 4; j denotes the active density of the current in4-6, the design is 4A/mm2Is a standard.
The minimum value of the magnetic core AP adopted by the design is obtained by calculation of a formula II:
Figure BDA0002623111060000033
according to claim 3, the core section A of the PM70 core and the PM70 core are selected in consideration of certain variable factorse＝7.90cm2Surface area A of magnetic coreW＝11.40cm2，AP＝Ae×AW＝90.06cm4And checking the maximum value of the working magnetic flux density to obtain the following values:
Figure BDA0002623111060000034
the difference between the maximum value of the operating flux density calculated above and the operating flux density selected herein is within the allowable range, and therefore the PM74 type core is selected.
Preferably, the high-frequency transformer magnetic core has N primary turns in a low-voltage circuitpThe calculation formula of (2) is as follows:
Figure BDA0002623111060000041
for convenient use, the number of turns is an integer, the number of turns of the primary side is 13 turns, and the turn ratio of the primary side and the secondary side of the half-low voltage circuit is as follows:
Figure RE-GDA0002794130380000042
the number of secondary turns of the high-frequency transformer is as follows: 13x 3.5-45.5, and finally taking an integer 46;
according to the system requirements, the maximum value capable of obtaining the current passing through the original low-voltage circuit is I1min26A, 12A, or electricallyThe flow density being 4A/mm2And obtaining bare surface integrals of the primary and secondary side wires of the circuit according to a formula:
Figure BDA0002623111060000043
Figure BDA0002623111060000044
if the frequency of the passing alternating current is high, the clustering effect needs to be considered, the diameter of the circuit wire is required to be not more than 3 times of the penetration depth, taking a copper wire as an example, and the temperature value is 100 ℃, then the calculation formula of the penetration depth is as follows:
Figure BDA0002623111060000045
according to the bus length of PM74 type magnetic core, the copper width value is that w equals 35mm, then the thickness calculation of former vice limit copper line is:
Figure BDA0002623111060000046
Figure BDA0002623111060000047
in summary, the lengths of the primary and secondary wires of the circuit are required to be 35mm × 0.2mm and 35mm × 0.1 mm.
Preferably, the communication module comprises a transmission module and a receiving module, the receiving module is respectively connected with the power module and the detection module, and the transmission module is connected with the terminal. The transmission module uploads real-time charging progress and charging state through a wireless network, so that digital management and integrated monitoring of the charging pile by an integrated system are facilitated; the receiving module receives information uploaded by the main system, so that real-time control over the charging pile is achieved.
Preferably, the detection module comprises a state monitoring module, a fault detection functional module and an electric power metering device module, wherein the state monitoring module is connected with the power supply module, and the fault detection functional module is connected with the equipment through a charging interface. The state monitoring module mainly comprises a charging state monitoring module. The function that charge state monitoring module exists mainly is in order to carry out real-time supervision to the charge state that fills electric pile of low pressure direct current to ensure that whole integration system operation is stable, this wherein specifically including whether be in charge state, charge degree, current state etc.. The control panel needs to read I/O in time to obtain a circuit instantaneity signal, the fault detection function module finishes outputting/inputting voltage, current and voltage feedback information of a charging pile state by reading an A/D interface, and reads CAN bus signals in time, so that telecommunication feedback of a CAN bus circuit is obtained, and reading and detection of the CAN bus state are realized by a universal asynchronous connection port.
Preferably, the equipment comprises a battery management system BMS and a power battery pack, wherein the battery management system BMS is respectively connected with the fault detection function module and the power battery pack.
Preferably, the electric power metering device module comprises a low-voltage three-phase meter and a collecting device, and the collecting device is connected with the battery management system BMS. The direct current charging pile metering and data remote acquisition requirements are met.
Preferably, the terminal comprises a computer or a handheld device.
The invention has the beneficial effects that:
1. the effect of charging control is improved, the occurrence of faults is reduced, and the operation stability of the charging pile is improved.
2 the inconvenience of installing traditional charging pile charging and electric power metering respectively is solved, the electric power metering device is integrated into the charging pile, the connection links of charging facilities are reduced, and the charging and metering integration is realized.
3. The system is widely installed in places with conditional installation beside the existing parking spaces, such as electric poles, walls, parking sheds and the like, and further activates the existing resources of the power grid, thereby realizing quality improvement and efficiency improvement
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a communication flow diagram of the present invention.
In the figure, the battery management system comprises a power module 1, a protection module 1.1, a voltage transformation module 1.2, a communication module 2, a transmission module 2.1, a receiving module 2.2, a detection module 3, a state monitoring module 3.1, a fault detection function module 3.2, an electric power metering device module 3.3, a charging module 4, equipment 5, a battery management system BMS 5.2, a power battery pack 5.2 and a terminal 6.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the charging pile system based on the low-voltage direct-current power supply technology comprises a direct-current charging pile, wherein the direct-current charging pile comprises a power module 1, a communication module 2, a detection module 3 and a charging interface 4, the direct-current charging pile is respectively connected with a device 5 and a terminal 6, and the terminal 6 comprises a computer or a handheld device. Detection module 3 sets up on the control panel under the low pressure direct current stake of charging, realizes the demand of charging voltage soon, charging current soon etc. with the help of the communication module that contains in the equipment to satisfy the control requirement of low pressure direct current stake control panel to power pack output voltage and electric current.
The main chip of the control board is generally selected from an SDO409FZKIO8 micro-controller with the main frequency of 170M. The SDO409FZKIO8 takes CorlortextK5 as an inner core and is suitable for processing chores; the largest memory of the SDO409FZKIO8 microcontroller is provided with a flash memory of 2MB and an SRAM of 200KB, which is enough to meet the application condition of the embedded charging pile system; the control board has more than 2 universal connection ports and 6 universal asynchronous serial ports, and the number of the serial ports of the control board circuit is enough: there are 120 general-purpose ports, which are enough to satisfy the line requirement of 12 interface input/output under the control board circuit. The main chip of the lower board of the control board selects a digital integrated signal processor which mainly adopts TMD349F20001 of 100MHz as an optimum, and is provided with more than 2 CAN controllers which are enough to meet the CAN interface requirement of finishing network real-time communication with a BMSW and a module power supply; the system is provided with more than 2 SDI modules, which can meet the interface requirements between the insulation control module and fault communication; the design of 18 paths of A/D sampling is to meet the requirement of realizing high-speed sampling by multiple channels of a low-voltage circuit; the 36-channel digital I/O switch is used for better meeting the requirements of the charging pile on real-time monitoring of the interface and low-voltage control of a circuit. The general design of the control board circuit generally takes into account the dual board design of the ARM board circuit and the SDI board circuit. The upper board ARM control board circuit specifically comprises a power supply circuit, a 241 communication circuit, a PS651 communication serial port, a sampling circuit, a signal conditioning bus, a FLASH feedback circuit and a reset circuit. The SDI control panel circuit mainly comprises a power supply circuit, a relay protection and control device, a CAN communication circuit and a reset circuit. Thus, the control board circuit meets the design requirements of complete communication and communication.
The power module 1 comprises a protection module 1.1 and a transformation module 1.2, and the input end of the transformation module 1.2 is powered by three-phase five-phase 320V direct current. The function of the protection module is mainly to prevent the integrated system from being damaged by alternating current and strong voltage in the low-voltage direct current circuit; the voltage transformation module is used for safely converting the flowing voltage and current of the low-voltage direct-current power grid, so that safe voltage is provided for the realization of LED driving and circuit control functions.
The transformation module 1.2 comprises a high-frequency transformer, the primary side transformation voltage of the high-frequency transformer is 252V, and the whole circuit is protected; power 3KW, unified circuit; the switching frequency is 20KHZ, and short circuit is prevented; the frequency of the voltage transformation instrument is 0.9, and disconnection is prevented; the magnetic flux density was 0.16T, protecting the magnet wires.
In the technical scheme, the high-frequency transformer mainly adopts an AP method, and the external power of the high-frequency transformer is calculated as follows:
Figure BDA0002623111060000081
according to the AP method, there are:
Figure BDA0002623111060000082
formula II, K0The use index of a system window is referred, and the value is generally 0.4; kfThe expression is a waveform index, and a general sine wave value is 4.44 and a square wave value is 4; j is the active density of the current, usually between 4 and 6, generally 5A/mm2It is common, but the design is 4A/mm2Is a standard.
The minimum value of the magnetic core AP adopted by the design is obtained by calculation of a formula II:
Figure BDA0002623111060000083
according to claim 3, the core section A of the PM70 core and the PM70 core are selected in consideration of certain variable factorse＝7.90cm2Surface area A of magnetic coreW＝11.40cm2，AP＝Ae×AW＝90.06cm4And checking the maximum value of the working magnetic flux density to obtain the following values:
Figure BDA0002623111060000084
this indicates that it is desirable to select a PM74 type core because there is little difference between its maximum operating flux density and the operating flux density selected herein. This is the primary winding number N for a low voltage circuitpThe calculation formula of (2) is as follows:
Figure BDA0002623111060000085
for convenient use, the number of turns is an integer, the number of turns of the primary side is 13 turns, and the turn ratio of the primary side and the secondary side of the half-low voltage circuit is as follows:
Figure BDA0002623111060000086
the number of secondary turns of the high-frequency transformer is as follows: 13x 3.5-45.5, and finally taking an integer 46;
according to the system requirements, the maximum value capable of obtaining the current passing through the original low-voltage circuit is I1min26A, 12A, if the current density takes 4A/mm2And obtaining bare surface integrals of the primary and secondary side wires of the circuit according to a formula:
Figure BDA0002623111060000091
Figure BDA0002623111060000092
if the frequency of the passing ac current is high, the cluster effect needs to be considered, and the diameter of the circuit wire is required to be not more than 3 times of the penetration depth, taking a copper wire as an example, and the temperature value is generally 100 ℃, then the penetration depth is calculated by the following formula:
Figure BDA0002623111060000093
according to the bus length of PM74 type magnetic core, the copper width value is that w equals 35mm, then the thickness calculation of former vice limit copper line is:
Figure BDA0002623111060000094
Figure BDA0002623111060000095
in summary, the lengths of the primary and secondary wires of the circuit are required to be 35mm × 0.2mm and 35mm × 0.1 mm.
The communication module 2 comprises a transmission module 2.1 and a receiving module 2.2, the receiving module 2.2 is respectively connected with the power module 1 and the detection module 3, and the transmission module 2.1 is connected with the terminal 6. The transmission module uploads real-time charging progress and charging state through a wireless network, so that digital management and integrated monitoring of the charging pile by an integrated system are facilitated; the receiving module receives information uploaded by the main system, so that real-time control over the charging pile is achieved.
The detection module comprises a state monitoring module 3.1, a fault detection functional module 3.2 and an electric power metering device module 3.3, wherein the state monitoring module 3.1 is connected with the power supply module 1, and mainly comprises a charging state monitoring module. The function that the charge state monitoring module exists mainly is in order to carry out real-time supervision to the charge state of low pressure direct current stake of charging to ensure that whole integration system operation is stable, this wherein specifically including whether be in charge state, the progress of charging, current state etc.. The fault detection function 3.2 is connected to the device 5 via the charging interface 4. The control panel needs to read I/O in time to obtain a circuit instantaneity signal, the fault detection function module finishes outputting/inputting voltage, current and voltage feedback information of a charging pile state by reading an A/D interface, and reads CAN bus signals in time, so that telecommunication feedback of a CAN bus circuit is obtained, and the CAN bus state is read and detected by a universal asynchronous connection port.
The device 5 comprises a battery management system BMS5.1 and a power battery pack 5.2, the battery management system BMS5.1 being connected to a fault detection function module 3.2 and to the power battery pack 5.2, respectively. The electric power metering device module 3.3 comprises a low-voltage three-phase meter and a collecting device, and the collecting device is connected with a battery management system BMS 5.1. The direct current charging pile metering and data remote acquisition requirements are met.
During operation, the control panel under the low voltage direct current fills electric pile realizes the demand of filling voltage, filling current etc. fast with the help of the communication module that contains in the equipment to satisfy the low voltage direct current and fill electric pile control panel and to the control requirement of power supply package output voltage and electric current. The power that low-voltage direct current fills integration and fills electric pile system and use generally possesses the function of electric energy conversion. The power supply is generally powered by three-phase five-phase 320V direct current, and the required voltage and current are output after the direct current/alternating current and alternating current/alternating current conversion is realized through an internal power supply. Because the process uses a high-efficiency module power supply, the power conversion cannot be controlled in the design of the scheme, and the scheme focuses on the integrated control of the whole module power supply by the control board circuit. Because the power of the single group of module power supply can not completely meet the power requirement of the low-voltage direct-current charging pile in quick charging, a method of connecting the plurality of groups of module power supplies in series is needed in design, and therefore quick charging is achieved.
The number of the communication module power supplies of the direct current charging pile control board and the module power supply group is determined by the ratio of rated power to single power supply power. The direct current fills the electric pile control panel and controls the charging voltage and the charging current of module power supply communication control module power output electric automobile demand.
The control board voltage and the module power supply group of the low-voltage direct-current charging pile are mainly communicated in real time by utilizing a CAN bus. The communication process between the control board circuit and the module power supply is shown in detail in fig. 2. The whole real-time communication process must obey the working mode, the control panel is taken as the main part, and the module power supply is the slave part. The key information mainly comprises startup power supply information, state query information, parameter setting information and power supply shutdown information.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the terms detection module, power module, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims (10)

1.一种基于低压直流供电技术的计充一体化充电桩系统，包括直流充电桩，其特征在于，所述直流充电桩包括电源模块(1)、通信模块(2)、检测模块(3)和充电接口(4)，直流充电桩分别与设备(5)、终端(6)相连。1. A meter-charging integrated charging pile system based on low-voltage DC power supply technology, comprising a DC charging pile, wherein the DC charging pile comprises a power module (1), a communication module (2), and a detection module (3) and a charging interface (4), and the DC charging pile is respectively connected with the device (5) and the terminal (6). 2.根据权利要求1所述的一种基于低压直流供电技术的计充一体化充电桩系统，其特征在于，所述电源模块(1)包括保护模块(1.1)和变压模块(1.2)，变压模块(1.2)输入端由三相五相320V直流电供电。2. A meter-charging integrated charging pile system based on low-voltage DC power supply technology according to claim 1, characterized in that the power module (1) comprises a protection module (1.1) and a transformer module (1.2), The input end of the transformer module (1.2) is powered by three-phase five-phase 320V direct current. 3.根据权利要求1所述的一种基于低压直流供电技术的计充一体化充电桩系统，其特征在于，所述变压模块(1.2)包括高频变压器，所述高频变压器原边变压电压为252V，功率3KW，开关频率20KHZ，变压仪器频率0.9，磁通密度0.16T。3. A meter-charging integrated charging pile system based on low-voltage DC power supply technology according to claim 1, wherein the transformer module (1.2) comprises a high-frequency transformer, and the primary side of the high-frequency transformer changes The voltage is 252V, the power is 3KW, the switching frequency is 20KHZ, the frequency of the transformer is 0.9, and the magnetic flux density is 0.16T. 4.根据权利要求3所述的一种基于低压直流供电技术的计充一体化充电桩系统，其特征在于，所述高频变压器的外在功率计算为：4. A meter-charging integrated charging pile system based on low-voltage DC power supply technology according to claim 3, characterized in that, the external power of the high-frequency transformer is calculated as:
Figure FDA0002623111050000011
Figure FDA0002623111050000011
 按照AP法，则有：According to the AP method, there are:
Figure FDA0002623111050000012
Figure FDA0002623111050000012
 公式②中，K0指系统窗口的使用指数，取值0.4；Kf表示的是波形指数，正弦波取值4.44、方波取值4；J指电流的活动密度，在4-6之间取值，本设计以4A/mm2为标准；In formula ②, K 0 refers to the use index of the system window, which is 0.4; K f represents the waveform index, which is 4.44 for sine wave and 4 for square wave; J refers to the activity density of current, which is between 4 and 6 value, this design takes 4A/ mm2 as the standard; 由公式②的计算得到本次设计采用的磁芯AP最小值为：From the calculation of formula ②, the minimum value of the magnetic core AP used in this design is:
Figure FDA0002623111050000013
Figure FDA0002623111050000013
 根据权3内容，在考虑一定的变量因素的前提下，选择PM70型磁芯，PM70型磁芯的磁芯截面Ae＝7.90cm2、磁芯表面积AW＝11.40cm2，AP＝Ae×AW＝90.06cm4，检验其工作磁通密度的最大值即为：According to the content of weight 3, under the premise of considering certain variable factors, the PM70-type magnetic core is selected. The core section of the PM70-type magnetic core is A e =7.90cm 2 , the core surface area A W =11.40cm 2 , AP=A e ×A W =90.06cm 4 , the maximum value of its working magnetic flux density is:
Figure FDA0002623111050000021
Figure FDA0002623111050000021
 上述计算得到的工作磁通密度的最大值和本文选取的工作磁通密度之间差值在允许范围内，因此选择PM74型磁芯。The difference between the maximum value of the working magnetic flux density calculated above and the working magnetic flux density selected in this paper is within the allowable range, so PM74 type magnetic core is selected. 5.根据权利要求4所述的一种基于低压直流供电技术的计充一体化充电桩系统，其特征在于，所述高频变压器磁芯在低压电路中原边匝数Np的计算公式为：5. A meter-charging integrated charging pile system based on low-voltage DC power supply technology according to claim 4, wherein the formula for calculating the number of turns N p of the primary side of the high-frequency transformer core in the low-voltage circuit is:
Figure FDA0002623111050000022
Figure FDA0002623111050000022
 为方便使用，匝数取整数，原边匝数为13匝，同时半低压电路的原边以及副边缠绕的电路匝数比为：For the convenience of use, the number of turns is an integer, and the number of turns on the primary side is 13 turns. At the same time, the turns ratio of the primary side and the secondary side of the semi-low voltage circuit is:
Figure FDA0002623111050000023
Figure FDA0002623111050000023
 由式⑥，高频变压器的副边匝数：13x3.5＝45.5，最终取整数46；By formula ⑥, the number of secondary turns of the high-frequency transformer: 13x3.5=45.5, and the final integer is 46; 按照系统要求，能够获取到原低压电路所经电流的最大值分别是I1min＝26A,I＝12A，若电流密度取值4A/mm2，按照公式得出电路原、副边导线的赤裸面积分：According to the system requirements, the maximum value of the current that can be obtained by the original low-voltage circuit is I1 min = 26A, I = 12A, if the current density is 4A/mm 2 , the bare area of the primary and secondary side wires of the circuit can be obtained according to the formula Minute:
Figure FDA0002623111050000024
Figure FDA0002623111050000024
Figure FDA0002623111050000025
Figure FDA0002623111050000025
 若经过的交流电流的频率较高，需考虑集群效应，要求电路导线直径不可以超过其穿透深度的3倍，以铜线为例，其温度值取100℃，则其穿透深度的计算公式：If the frequency of the passing AC current is high, the cluster effect needs to be considered, and the diameter of the circuit wire should not exceed 3 times the penetration depth. formula:
Figure FDA0002623111050000031
Figure FDA0002623111050000031
 按照PM74型磁芯的总线长度，铜线宽度取值为w＝35mm，则原副边铜线的厚度计算为：According to the bus length of PM74 type magnetic core, the copper wire width is w=35mm, then the thickness of the original secondary side copper wire is calculated as:
Figure FDA0002623111050000032
Figure FDA0002623111050000032
Figure FDA0002623111050000033
Figure FDA0002623111050000033
 综上所述，电路原副边导线的长度要求为35mm×0.2mm和35mm×0.1mm。To sum up, the lengths of the primary and secondary side wires of the circuit are required to be 35mm×0.2mm and 35mm×0.1mm. 6.根据权利要求1所述的一种基于低压直流供电技术的计充一体化充电桩系统，其特征在于，所述通信模块(2)包括传输模块(2.1)和接收模块(2.2)，所述接收模块(2.2)分别与电源模块(1)、检测模块(3)相连，所述传输模块(2.1)与终端(6)相连。6. A meter-charging integrated charging pile system based on a low-voltage DC power supply technology according to claim 1, wherein the communication module (2) comprises a transmission module (2.1) and a receiving module (2.2), wherein the The receiving module (2.2) is respectively connected with the power supply module (1) and the detection module (3), and the transmission module (2.1) is connected with the terminal (6). 7.根据权利要求1所述的一种基于低压直流供电技术的计充一体化充电桩系统，其特征在于，所述检测模块设于直流充电桩内部的控制板上，检测模块包括状态监测模块(3.1)、故障检测功能模块(3.2)和电力计量装置模块(3.3)，所述状态监测模块(3.1)与电源模块(1)相连，故障检测功能模块(3.2)经过充电接口(4)与设备(5)相连。7. A meter-charging integrated charging pile system based on low-voltage DC power supply technology according to claim 1, wherein the detection module is arranged on a control board inside the DC charging pile, and the detection module comprises a state monitoring module (3.1), a fault detection function module (3.2) and a power metering device module (3.3), the state monitoring module (3.1) is connected to the power supply module (1), and the fault detection function module (3.2) is connected to the power supply module (3.2) via the charging interface (4). The device (5) is connected. 8.根据权利要求7所述的一种基于低压直流供电技术的计充一体化充电桩系统，其特征在于，所述设备(5)包括电池管理系统BMS(5.1)和动力电池组(5.2)，所述电池管理系统BMS(5.1)分别与故障检测功能模块(3.2)、动力电池组(5.2)相连。8. A meter-charging integrated charging pile system based on low-voltage DC power supply technology according to claim 7, wherein the device (5) comprises a battery management system BMS (5.1) and a power battery pack (5.2) , the battery management system BMS (5.1) is respectively connected with the fault detection function module (3.2) and the power battery pack (5.2). 9.根据权利要求8所述的一种基于低压直流供电技术的计充一体化充电桩系统，其特征在于，所述电力计量装置模块(3.3)包括低压三相计量表与采集装置，采集装置与电池管理系统BMS(5.1)相连。9. A meter-charging integrated charging pile system based on low-voltage DC power supply technology according to claim 8, characterized in that the power metering device module (3.3) comprises a low-voltage three-phase meter and a collection device, and the collection device Connected to the battery management system BMS (5.1). 10.根据权利要求1所述的一种基于低压直流供电技术的计充一体化充电桩系统，其特征在于，所述终端(6)包括计算机或手持设备。10. A meter-charging integrated charging pile system based on a low-voltage DC power supply technology according to claim 1, wherein the terminal (6) comprises a computer or a handheld device.
CN202010789060.1A 2020-08-07 2020-08-07 Charging and charging integrated charging pile system based on low-voltage direct-current power supply technology Pending CN112172572A (en)

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