CN113060032A

CN113060032A - Fill electric pile controller

Info

Publication number: CN113060032A
Application number: CN202110194289.5A
Authority: CN
Inventors: 池观权; 焦永杰; 袁锋刚
Original assignee: Shenzhen Car Energy Net Co ltd
Current assignee: Shenzhen Car Energy Net Co ltd
Priority date: 2021-02-20
Filing date: 2021-02-20
Publication date: 2021-07-02

Abstract

The invention provides a charging pile controller, which comprises an input/output module, an auxiliary power supply module, a controller module and an interface module, wherein the input/output module is used for outputting a charging pile signal to a charging pile; the input and output module is used for supplying power to the input and output module and the auxiliary power supply module; the auxiliary power supply module is used for supplying power to the controller module and the interface module; and the controller module is used for receiving the data transmitted by the input/output module and the interface module and processing the data. The input and output module comprises an input port, a lightning protection circuit, a charging parameter metering unit, a main relay control circuit, an adhesion detection circuit and an output port. The input end of the auxiliary power supply module is connected with the lightning protection circuit, and the output end of the auxiliary power supply module is connected with the controller module and the interface module respectively. The charging pile controller provided by the invention has the advantages of low cost, high integration level, small volume, higher flexibility and reliability, rich functions and simple structure.

Description

Fill electric pile controller

Technical Field

The invention relates to the technical field of charging piles, in particular to a charging pile controller.

Background

The electric automobile is an environment-friendly, clean and energy-saving product capable of realizing zero emission, is the development direction of the automobile industry in the future, and correspondingly, in order to realize the conversion process of the industry from the germination stage to the growth stage, the proportion of an electric automobile charging facility matched with the electric automobile charging facility in the whole automobile is higher and higher, and the development trend that the functions are more and more complex, the power is more and more large and the EMC requirement is higher and more exists; due to the development of the technology, the requirements on the integration level, reliability, energy conservation, efficiency improvement and the like of the electric vehicle charging controller are higher and higher.

The charging pile in the prior art mainly comprises two types:

the utility model provides a fill electric pile for simple and easy type, only possess simple function of charging, do not possess abundant demonstration function, do not possess necessary software and hardware protect function, do not possess the three-phase output function, do not possess the public operation function yet.

The other type of high-configuration charging pile with ARM9 as a core comprises a control panel main body, a CPU microcontroller arranged on the control panel main body, a power failure detection circuit electrically connected with the CPU microcontroller, a control guide circuit, an auxiliary power supply, an RS485 ammeter communication interface, an input/output interface and the like, wherein other lightning protection devices, a circuit breaker, a contactor, an ammeter and the like need to be separately and electrically connected with the controller. Although the controller of the charging pile is advanced, the controller is high in cost, the software programming of the controller is complex, the whole structure is loose, the flexibility is low, and cost control is a disadvantage when the charging pile is used on a large scale.

In addition, most of the existing charging pile controllers adopt outsourced onboard power modules, so that the problems of serious heating, inflexible board circuit layout, poor EMC effect and the like are often caused, and the requirements of higher standards are difficult to achieve. The problem is solved by increasing the front-end filter capacitor and the related inductor of the power module or adding a filter separately by a plurality of manufacturers through EMC test, and the solution is high in cost and high in standby power consumption, so that certain negative influence is brought to consumers in normal use.

To sum up, with the high-speed development of new energy cause, higher and higher requirements are put forward to the controller of the alternating current pile, and although the charging pile in the prior art has a basic alternating current charging function, a controller with higher integration level and better reliability is urgently needed for the charging pile system.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a charging pile controller which is low in cost, high in integration level, small in size, high in flexibility and reliability, rich in functions and simple in structure.

In order to achieve the purpose, the invention adopts the technical scheme that:

a charging pile controller comprises an input/output module, an auxiliary power supply module, a controller module and an interface module; the input and output module is used for supplying power to the input and output module and the auxiliary power supply module; the auxiliary power supply module is connected with the input/output module and the controller module and is used for supplying power to the controller module and the interface module; the controller module is connected with the input/output module, the auxiliary power supply module and the interface module and is used for receiving data transmitted by the input/output module and the interface module and processing the data, so that the input/output module and the interface module are controlled;

the input and output module comprises an input port, a lightning protection circuit, a charging parameter metering unit, a main relay control circuit, an adhesion detection circuit and an output port; the lightning protection circuit is connected with the input port, and the adhesion detection circuit is connected with the output port;

the input end of the auxiliary power supply module is connected with the lightning protection circuit, and the output end of the auxiliary power supply module is connected with the controller module and the interface module respectively.

The further improvement of the technical scheme is as follows:

and a filter circuit is also connected between the auxiliary power supply module and the lightning protection circuit.

The auxiliary power supply module comprises a power supply control chip and a transformer, the transformer comprises a framework and a magnetic core, and the winding method of the transformer comprises the following steps: the shielding layer is fully wound on the bottommost layer of the framework, then the primary layer is wound, and finally the rest secondary layers are wound.

The charging parameter metering unit comprises a metering chip, a three-phase voltage sampling circuit and a three-phase current sampling circuit.

The input and output module further comprises a leakage detection circuit, a grounding detection circuit, a control guide circuit and an RJ45 debugging and maintaining circuit.

The leakage detection circuit comprises a mutual inductor and a latch circuit.

The interface module comprises a communication module, an RS485 ammeter communication circuit clock module, a dog feeding circuit, a data storage unit and an indicator light circuit.

The RS485 ammeter communication circuit comprises a receiving and transmitting driving chip, a pull-up resistor, a pull-down resistor, a thermistor and a TVS tube.

The main relay control circuit and the adhesion detection circuit are integrated, the main relay control circuit comprises a relay and a triode control circuit, and the triode control circuit is used for enabling the holding voltage of the relay to be lower than the starting voltage.

The charging pile controller also comprises two temperature detection circuits, namely a CPU temperature detection circuit and a main relay temperature detection circuit; the CPU temperature detection circuit is used for detecting the temperature of the controller module; the main relay temperature detection circuit is used for detecting the temperature of a main relay in the main relay control circuit.

According to the technical scheme, the charging pile controller comprises the input and output module, the auxiliary power supply module, the controller module and the interface module, and has other practical functions while meeting the charging function of the charging pile. The input and output module integrates a charging parameter metering unit, the configuration of an external alternating current electric meter is saved, the investment of cost is saved, the size of the whole controller is reduced, and the integration level is effectively improved. Adopt main relay control circuit, replace traditional ac contactor and complicated electric wiring, its electrical structure is simple relatively, and compares with the traditional scheme that uses external three-phase ammeter and three-phase ac contactor, and hardware cost can save half at least. The controller has rich functions, integrates a lightning protection circuit, an adhesion detection circuit, an interface module and the like, improves the safety and reliability of the controller, and simultaneously provides convenience for interaction of the controller and other equipment.

Drawings

Fig. 1 is a schematic diagram of the general framework of a charging pile controller according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a lightning protection circuit according to an embodiment of the invention.

Fig. 3 is a schematic structural diagram of a leakage detection circuit according to an embodiment of the present invention.

Fig. 4 is a schematic control diagram of the leakage detection circuit according to the embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a ground detection circuit according to an embodiment of the invention.

Fig. 6 is a diagram of measured data of the ground fault detection circuit according to the embodiment of the invention.

Fig. 7 is a schematic structural diagram of a metering chip of the charging parameter metering unit according to the embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a three-phase voltage sampling circuit of the charging parameter metering unit according to the embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a three-phase current sampling circuit of the charge parameter metering unit according to the embodiment of the present invention.

Fig. 10 is a schematic diagram of an integrated structure of a main relay control circuit and an adhesion detection circuit according to an embodiment of the present invention.

Fig. 11 is a schematic structural diagram of a control pilot circuit according to an embodiment of the present invention.

Fig. 12 is a schematic structural diagram of an RJ45 debugging and maintenance circuit according to an embodiment of the present invention.

Fig. 13 is a schematic structural diagram of a local upgrade USB interface according to an embodiment of the present invention.

Fig. 14 is a schematic structural diagram of an auxiliary power module according to an embodiment of the invention.

Fig. 15 is a schematic structural diagram of a filter circuit according to an embodiment of the present invention.

Fig. 16 is a schematic structural diagram of a transformer of the auxiliary power module according to the embodiment of the invention.

Fig. 17 is a schematic structural diagram of a bluetooth module according to an embodiment of the present invention.

Fig. 18 is a schematic structural diagram of a 4G module according to an embodiment of the present invention.

Fig. 19 is a schematic structural diagram of an RS485 electric meter communication circuit according to an embodiment of the present invention.

Fig. 20 is a schematic structural diagram of a temperature detection circuit according to an embodiment of the present invention.

Fig. 21 is a schematic structural diagram of a clock module according to an embodiment of the present invention.

Fig. 22 is a schematic structural diagram of a dog feeding circuit according to an embodiment of the present invention.

Fig. 23 is a schematic structural diagram of an indicator light circuit according to an embodiment of the present invention.

FIG. 24 is a schematic structural diagram of a data storage unit according to an embodiment of the present invention.

Fig. 25 is a schematic structural diagram of a controller module according to an embodiment of the present invention.

Fig. 26 is a schematic structural diagram of a power conversion and power failure detection circuit according to an embodiment of the present invention.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Fig. 1 to 26 are schematic diagrams of a charging pile controller according to an embodiment of the present invention.

Example 1: as shown in fig. 1, the charging pile controller of the present embodiment includes an input/output module, an auxiliary power supply module, a controller module, and an interface module; the input and output module is used for supplying power to the input and output module and the auxiliary power supply module; the auxiliary power supply module AC-DC is connected with the input/output module and the controller module MCU and is used for supplying power to the controller module and the interface module; the controller module is connected with the input/output module, the auxiliary power supply module and the interface module and is used for receiving data transmitted by the input/output module and the interface module and processing the data, so that the input/output module and the interface module are controlled.

The input and output module comprises an input port, a lightning protection circuit, a leakage detection circuit, a grounding detection circuit, a charging parameter metering unit, a main relay control circuit, an adhesion detection circuit, a control guide circuit, an RJ45 debugging and maintaining circuit and an output port; the lightning protection circuit is connected with the input port, and the adhesion detection circuit is connected with the output port.

As shown in fig. 2, the lightning protection circuit includes a ceramic gas discharge tube, a varistor, and the like, and one end of the ceramic gas discharge tube is grounded. The circuit can realize the lightning protection function, prevent the damage of rear-end devices caused by voltage surge and improve the EMC performance.

As shown in fig. 3, the electric leakage detection circuit includes chip U24, latch circuit and mutual inductor, has integrateed the electric leakage and has detected the function, has realized a type earth leakage protection, the chip U24 model is FM2147, the mutual inductor is current leakage current integral type mutual inductor. When the leakage current signal is detected, FM2147 outputs a pulse signal having a duration of about 30ms, which goes through the latch circuit into a latched state. In order to provide the processor with enough processing time, a latch circuit is added, on one hand, the circuit can lock the leakage state and reserve the processor with enough time for detecting and processing leakage, on the other hand, the situation that when the leakage occurs at the output end, the leakage triggers to disconnect the main relay, so that the leakage signal disappears can be avoided, if the leakage signal disappears, the processor chip is easy to miss judgment, and the processor chip is recharged and leaks electricity, so that the processor chip enters a dead cycle state. Meanwhile, compared with the traditional design, the integrated design saves an external A-type leakage protection device, saves the cost, reduces the volume and has higher integration level. The control principle of the leakage detection circuit is shown in fig. 4, firstly, leakage current is sampled, subjected to voltage division and filtering and then reaches a leakage detection IC, a latch circuit is triggered to enter a latch state, the latch circuit is reset after the detection is processed by a controller module MCU, and the latch circuit or a chip controls a relay to be disconnected.

As shown in fig. 5, the ground detection circuit includes a plurality of voltage dividing resistors, diodes and capacitors, and has functions of ground detection and L, N reverse connection detection, wherein a resistor larger than 10M Ω is used for dividing voltage between the L-line and the ground line, and then the voltage is rectified by the diodes to obtain a stable dc voltage, and whether the ground line is connected or not and whether the L/N is reverse connected or not is determined by detecting the voltage value of the dc voltage; the divider resistor is connected with two capacitors in series, and is mainly used for increasing the insulation resistance so as to meet the requirement of insulation resistance larger than 10M omega in the national standard.

As shown in fig. 6, since the input voltage is linearly related to the divided voltage as seen from the data, it is necessary to perform the determination in combination with the actual input voltage. The grounding detection circuit can also judge whether the zero line and the live wire are reversely connected, when the zero line and the live wire are reversely connected, the zero line is equivalent to the voltage division of the ground wire, and the voltage division value is 0V.

As shown in fig. 7 to 9, the charging parameter metering unit includes a metering chip, a three-phase voltage sampling circuit, and a three-phase current sampling circuit. The three-phase alternating current metering function is integrated on the single board, and a metering chip U20 model number is RN8302B, and the three-phase alternating current metering function relates to three-phase voltage sampling and three-phase current sampling. Three-phase voltage sampling is carried out through a voltage transformer ZMPT107-1, and three-phase current sampling is carried out through a second-level current transformer CT-082K-2.0 (40A/(20mA)) conversion signal. The voltage signal difference is input into a metering chip U20, the charging voltage is calculated by U20, and the power calculation is carried out by matching with the acquired current value, so that the metering and charging functions are realized. Metrology chip U20, at 5000: 1, the nonlinear error is less than 0.1 percent, the precision requirements of 0.5S and 0.2S + level active electric energy meters are met, 7 ADC channels are shared, the sampling voltage range is +/-800 mV, and the sampled data is transmitted to the controller module through the SPI interface. Compared with the traditional design, the design saves an external three-phase alternating current electric meter, saves the cost, reduces the volume and has high integration level.

As shown in fig. 10, the main relay control circuit and the adhesion detection circuit are integrated, and the main relay control circuit includes a relay and a transistor control circuit, and the transistor control circuit is configured to make a holding voltage of the relay lower than a start voltage. In order to meet the requirements of simple wiring and small size of a product, the AHES4191 type relay with the adhesion detection function is used in the embodiment, the adhesion detection function is realized by mechanical linkage of the relay, and whether the main contact is adhered or not can be judged by detecting the opening and closing of the linkage opening contact from the weak current side. In order to reduce the heating of the relay, a triode control circuit is added in the circuit, so that the holding voltage of the relay is lower than the starting voltage, the heating of the excitation coil of the relay is reduced, and the heating of the relay is reduced. Meanwhile, in order to quickly disconnect the relay under the condition of electric leakage, a signal for triggering the relay to be disconnected is connected to the control end. Compared with the traditional design, the design saves an external three-phase alternating current contactor and complex electrical wiring, saves the cost, reduces the volume, and has high integration level and simple structure.

As shown in fig. 11, the CP signal of the control pilot circuit is a PWM signal capable of generating a 0% -100% duty ratio, and is a handshake signal between the ac pile and the vehicle, the CP signal is designed to be obtained by amplifying the PWM signal by a push-pull circuit, and in order to detect the amplitude of the CP voltage without affecting the CP, a voltage follower circuit built by an operational amplifier is used to detect the voltage of the CP. In order to flexibly meet the market demand, a circuit for pulling CP to 0V is also added.

As shown in fig. 12 and 13, the RJ45 debugging and maintaining circuit includes a local upgrade USB interface, in order to more conveniently debug, maintain and upgrade products, a USB0, a UART0 and a UART6 are led out from a main board for debugging and maintaining, a standard USB socket USB-AF-180 is adopted for the USB0, a UART0 and a UART6 are led out through an RJ45 interface, and an ESD tube ESDU5V0H4 is used to prevent electrostatic damage.

As shown in fig. 14, an input terminal of the auxiliary power module AC-DC is connected to the lightning protection circuit, and an output terminal of the auxiliary power module is connected to the controller module and the interface module, respectively. And a filter circuit is also connected between the auxiliary power supply module and the lightning protection circuit.

As shown in fig. 15, the filter circuit includes a ceramic gas discharge tube, a diode, an excitation coil, a resistor, and the like. The circuit can inhibit current surge and filtering, thereby protecting the auxiliary power supply module behind.

As shown in fig. 16, the auxiliary power module includes a power control chip, a transformer, and the like, and the power control chip UA1 is a TNY278P chip, which has the lowest system cost and excellent flexibility. A secondary U1 of the circuit adopts a TL431 feedback loop, TNY278P (UA1) is adjusted through an optical coupler OP1, and the circuit output is designed to be 12V/1A. Meanwhile, the transformer TM1 uses an EFD20 framework and a PC40 magnetic core, and the bottommost layer N1 is designed to be uniformly and densely wound and fully wound with a shielding layer; then uniformly and densely winding the steel wire around the primary N2; and finally winding the rest secondary N3, N4 and N5, wherein N3 and N4 are wound in a same layer and are wound in a parallel mode, and N5 is wound in a central and sparse mode. The winding method reduces the turn-to-ground distributed capacitance of the transformer when the auxiliary power supply module works, and the EMC effect is good; among them, designing DS of TNY278P reserves CA2, and D1 reserves RC, can provide conditions for EMC rectification. The practical verification proves that the auxiliary power supply module can resist lightning stroke and surge four levels (differential mode +/-2 KV and common mode +/-4 KV), and the EMC conduction and radiation margins are large and approximate to 10dB margins. Meanwhile, compared with the traditional design, the integrated design saves an external auxiliary power supply module and a lightning protection device, is flexible in layout, saves cost, reduces volume and is high in integration level.

The interface module comprises a communication module, an RS485 ammeter communication circuit, a temperature detection circuit, a clock module, a dog feeding circuit, an emergency stop function circuit, a data storage unit and an indicator light circuit.

As shown in fig. 17 and 18, the communication module includes a bluetooth module (fig. 17), a wifi module, and a 4G module (fig. 18). Bluetooth or 4G can be freely selected as an uplink channel, the Bluetooth module adopts advanced HY-40R 204C, and HY-40R 204C is a Module based on BLE 4.2 protocol, and has the characteristics of stability, good compatibility, small size and the like, thereby being convenient for field maintenance and upgrading; the 4G module uses a 4G full-network industrial module based on a high-pass platform, N720 is a 2G/3G/4G network system of three operators of domestic mobile/telecom/Unicom, and the integration level is high.

As shown in fig. 19, the RS485 electric meter communication circuit includes a transceiver driving chip, a pull-up resistor, a pull-down resistor, a TVS tube, a thermistor, etc., wherein the transceiver driving chip employs a self-transmitting and self-receiving SN65HVD82, and the maximum data transmission rate is 250 Kbps; the input range of the voltage meeting the differential mode and the common mode is-7V-12V. In order to improve the stability of the differential mode signal, a pull-up resistor is added on 485A, a pull-down resistor is added on 485B, and the design forms the correct level through a pull-up voltage and a pull-down grounding when 1 data is transmitted. And the 485A and the 485B are connected with the surface-mounted thermistors in series to prevent high-amplitude pulse. And a TVS tube is respectively added on the A, B wires for clamping protection. The SN65HVD82 transceiving control pin is controlled by a PNP triode, when data is not sent, the high level of the sending end of the controller module causes the IC chip to be in a data receiving mode, and the amplitude of the high level received by the chip at the sending high level receiving pin can be reduced by about 0.4 mV. This integration can convenience of customers selects external ammeter measurement mode, deals with the market demand in a flexible way.

As shown in fig. 20, the temperature detection circuit has two paths, which are respectively an MCU temperature detection circuit and a main relay temperature detection circuit; the MCU temperature detection circuit is used for detecting the temperature of the controller module; the main relay temperature detection circuit is used for detecting the temperature of a main relay in the main relay control circuit. The temperature sampling adopts a surface mounted NTC thermistor, the NTC thermistor is respectively arranged at the end of the controller module and the end of the power relay, and the temperature is detected according to the approximate linear change of the resistance value of the thermistor along with the temperature.

As shown in fig. 21, the clock module, to ensure the stability and reliability of the clock, controlsThe U14 has an external real time clock model RX-8025T, U14 is connected via I²And C, the clock is communicated with the processor, the clock travel time error is not more than 0.5 s/day, a temperature compensation mechanism is arranged in a severe environment to ensure the accuracy of the clock and has the function of time synchronization with the master station, and the time synchronization error is not more than +/-3 s. In order to ensure that the external clock can keep time normal when the external clock is powered down, a disposable lithium battery ER14250/T (BT1) and a power supply voltage switching circuit are added into the clock module, so that the clock module has a power-down clock keeping function.

As shown in figure 22, the dog feeding circuit can prevent a program from flying off and improve the reliability of a product, the dog feeding is carried out in an internal and external combination mode, a watchdog chip U18 of the dog feeding circuit selects SN74HC4060PW, and when the dog feeding circuit works normally, a 36s internal controller module needs to feed a dog once. When the controller module in 36s does not feed dogs, the SN74HC4060PW outputs high level, the N1 is conducted, the power supply control pin of the system 3V3 is pulled low, and the system is reset.

As shown in fig. 23, the indicator light circuit includes an indicator light board, a serial-parallel chip, a transceiver, and an emergency stop remote signaling circuit. The indicating lamp circuit uses 1-path PWM, a transceiver SN74HCT245NSR is adopted to be matched with a serial-parallel chip on the indicating lamp plate, the indicating lamp plate is controlled to meet the lamp effect of breathing and flowing water, and in addition, 1-path remote signaling is added to control an emergency stop button to provide an emergency stop function.

As shown in FIG. 24, the data storage unit uses a 128MB NAND Flash S34ML01G200TFI00 of external extension, and the external FLASH can store data such as transaction records, events, alarm information, charging process, system parameters and the like.

As shown in fig. 25, the controller module adopts NUC980DK61YC, has a core operating frequency of 300MHz, has a data processing Bit width of 32 bits, and adopts LINUX operating system for software, so that the performance completely meets the requirement of the charging pile in the current market.

As shown in fig. 26, the charging pile controller may further include a power conversion and power failure detection circuit, and the main power source outputs 5V by voltage reduction through a DC-DC circuit composed of LV2842XLVDDCR (U2), and supplies power to a 3.3V power source, a 4G module, a USB, a watchdog chip, a leakage detection chip, an indicator light, an RS485 chip, and an RTC chip. The power supply of 3.3V is output by a 5V power supply through an LDO TPS73733(U3), the power supply is 1.2V power supply, 1.8V power supply, MCU, metering IC, debugging serial port, Ethernet IC, NANDFLASH IC and Bluetooth module, the TPS73733 is a controllable LDO, whether the power supply is output or not is controlled by controlling the level of an EN pin, and a closed power control system is formed by utilizing the pin, combining a power supply conversion and power failure detection circuit, a dog feeding circuit and a controller module MCU. The used super capacitor is mainly used for continuously supplying power for a 3.3V power supply after power failure, so that the MCU of the controller module has enough time to finish the storage of necessary data. The power supply conversion and power failure detection circuit adopts a control chip UM809(U7), when power failure occurs, a main power supply stops working, the 12V power supply voltage drops firstly, then the 5V power supply voltage drops, and UM809 outputs low level to inform the controller module MCU of power failure.

The charging pile controller of the embodiment has the following functions besides the basic charging function: 1. local parameter and log saving function. 2. The local program upgrading function is provided. 3. The remote program upgrading function is provided. 4. The charging mode is flexible in function configuration, code scanning charging can be achieved, and plug-and-play charging can be achieved. 5. The mainboard has integrateed the ground connection and has detected the function, can realize the reliability that the mainboard detected ground connection. 6. The mainboard has integrateed auxiliary power source, has increased the integrated level of mainboard, and the cost is reduced has saved the space. 7. The mainboard has integrateed the electric leakage detection function, has saved the leakage and has protected the switch, and the integrated level is high. 8. The mainboard has integrateed the onboard function of three-phase measurement, has increased the integrated level of mainboard, and the cost is reduced has saved the space. 9. The mainboard integrates two temperature detection circuits. 10. The main board integrates an RTC circuit. 11. The mainboard has integrateed the lightning protection function, has saved the lightning protection device, has increased the integrated level of mainboard, and the cost is reduced has saved the space. 12. The mainboard integrates the relay control and adhesion detection functions, an external three-phase alternating current contactor is omitted, the integration level of the mainboard is increased, the cost is reduced, and the space is saved.

Compared with the prior art, the invention has the following advantages:

1. the cost advantage is as follows: the system has high cost performance, is compatible with single-phase or three-phase alternating current charging use occasions, has relatively simple electricity and structure, and can save at least half of the cost compared with the cost of hardware in the traditional scheme of using an external three-phase ammeter and a three-phase alternating current contactor; the power type relay AHES4191E40 adopted by the invention is designed into a power loop which can support three-phase 21KW power output and has a three-phase on-board metering function.

2. The intelligent charging pile has the advantages of volume, high integration level, no need of externally connecting a three-phase alternating current contactor, a lightning protection device, an auxiliary power supply and a three-phase electric meter to the mainboard, integration of functional circuits such as a power unit circuit, a lightning protection unit circuit, a power unit circuit, a metering unit circuit and the like on the controller, great reduction of the volume of the charging pile and realization of high-integration design of the controller.

3. The flexibility is high, and the reliability is high, has improved the EMC performance of product, realizes low stand-by power consumption (being less than 5W), the product that charges of multiple market demand of adaptation.

4. The power supply unit circuit is simple in design, the EMC conduction and radiation allowance is large (the allowance is close to 10dB), and meanwhile, the lightning surge four-stage protection is realized with the protection circuit designed by the thermistor, the piezoresistor, the discharge tube and other devices, so that the effects of saving devices, saving cost and high protection are achieved.

5. The function is abundant, the mainboard has integrated lightning protection circuit, filter circuit, auxiliary power supply circuit, the electric leakage detects, ground connection detects, charging parameter measurement circuit, main relay control and gluing are even detected, the interface is maintained in the debugging of RJ45, RS485 ammeter communication interface, two way temperature detection circuit, input/output interface, control guide circuit, 4G communication module, bluetooth communication module, feed the dog circuit, scram functional circuit, the data storage unit, the pilot lamp, local upgrading USB interface, the RTC circuit.

6. And (3) various upgrading modes: the charging pile (intelligent version) provided with the 4G module can realize remote update of MCU firmware through remote connection; a charging pile (basic version) provided with a Bluetooth module can support the updating of MCU firmware through Bluetooth; meanwhile, local USB upgrading can be carried out; software upgrading can be conveniently carried out on site or in other places, and subsequent upgrading maintenance is facilitated; the after-sale cost is reduced.

7. Adaptively configuring power output parameters, wherein when single-phase power supply is carried out, the current output is configured to be 32A (maximum output power is 7 KW); when three-phase power supply is carried out, the current output is configured to be 32A (maximum output power is 21 KW); during single-phase power supply, fill electric pile default overvoltage threshold value and be 267V AC, the undervoltage threshold value is 107V AC. And the overvoltage and undervoltage threshold value of each phase voltage is the same as the threshold value of single-phase power supply when three-phase power supply is carried out. During single-phase power supply, when the overvoltage voltage is within 300V and kept for 5s, the output power supply is immediately disconnected, the action time is 600ms, when the overvoltage voltage exceeds 300V, the output power supply is immediately disconnected, the protection action time is 600ms, when the undervoltage voltage is lower than 107V AC and kept for 5s, the output power supply is immediately disconnected, and the action time is 600 ms. When the input voltage is recovered to the normal voltage range (110V-264V) and the duration exceeds 1 minute, the overvoltage protection state is released. When three-phase power supply is carried out, the judgment and recovery rules of over-voltage and under-voltage protection of the phase voltages are the same as those of single-phase power supply; if any phase meets the protection condition, protection is generated; and recovering when the three phases all meet the recovery condition.

In the actual charging process, the output power can be adjusted according to the power distribution capacity of the power grid according to the background charging strategy, and flexible charging can be realized.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a fill electric pile controller which characterized in that: the power supply comprises an input/output module, an auxiliary power supply module, a controller module and an interface module; the input and output module is used for supplying power to the input and output module and the auxiliary power supply module; the auxiliary power supply module is connected with the input/output module and the controller module and is used for supplying power to the controller module and the interface module; the controller module is connected with the input/output module, the auxiliary power supply module and the interface module and is used for receiving data transmitted by the input/output module and the interface module and processing the data, so that the input/output module and the interface module are controlled;

2. The charging pile controller according to claim 1, wherein: and a filter circuit is also connected between the auxiliary power supply module and the lightning protection circuit.

3. The charging pile controller according to claim 1, wherein: the auxiliary power supply module comprises a power supply control chip and a transformer, the transformer comprises a framework and a magnetic core, and the winding method of the transformer comprises the following steps: the shielding layer is fully wound on the bottommost layer of the framework, then the primary layer is wound, and finally the rest secondary layers are wound.

4. The charging pile controller according to claim 1, wherein: the charging parameter metering unit comprises a metering chip, a three-phase voltage sampling circuit and a three-phase current sampling circuit.

5. The charging pile controller according to claim 1, wherein: the input and output module further comprises a leakage detection circuit, a grounding detection circuit, a control guide circuit and an RJ45 debugging and maintaining circuit.

6. The charging pile controller according to claim 5, wherein: the leakage detection circuit comprises a mutual inductor and a latch circuit.

7. The charging pile controller according to claim 1, wherein: the interface module comprises a communication module, an RS485 ammeter communication circuit, a clock module, a dog feeding circuit, a data storage unit and an indicator light circuit.

8. The charging pile controller according to claim 7, wherein: the RS485 ammeter communication circuit comprises a receiving and transmitting driving chip, a pull-up resistor, a pull-down resistor, a thermistor and a TVS tube.

9. The charging pile controller according to claim 1, wherein: the main relay control circuit and the adhesion detection circuit are integrated, the main relay control circuit comprises a relay and a triode control circuit, and the triode control circuit is used for enabling the holding voltage of the relay to be lower than the starting voltage.

10. The charging pile controller according to claim 1, wherein: the charging pile controller also comprises two temperature detection circuits, namely a CPU temperature detection circuit and a main relay temperature detection circuit; the CPU temperature detection circuit is used for detecting the temperature of the controller module; the main relay temperature detection circuit is used for detecting the temperature of a main relay in the main relay control circuit.