Charging adapter and DC charging pile conversion system

Abstract

The utility model provides a charging adapter and a DC charging pile conversion system, the charging adapter comprises a signal receiving interface, an MCU processor and a signal output interface, the signal receiving interface is used for receiving a first communication protocol signal; the MCU processor is connected with the signal receiving interface and is used for converting the acquired first communication protocol signal into a second communication protocol signal; the signal output interface is connected with the other end of the MCU processor and is used for outputting the second communication protocol signal to the electric vehicle; the first communication protocol signal and the second communication protocol signal are respectively a CAN communication signal and a PLC communication signal, or the PLC communication signal and the CAN communication signal. The charging compatibility problem caused by communication protocol differences between different electric vehicles and charging piles is solved. And protocol conversion is carried out on the signal through the MCU processor, so that the charging process can be smoothly started and carried out, and the universality and convenience of the charging facility are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle charging, and in particular to a charging converter head and a DC charging pile conversion system. Background Art

[0002] With the increasing global emphasis on environmental protection and sustainable development, electric vehicles (EVs), as a clean energy vehicle, are gradually gaining widespread adoption worldwide. However, as different countries and regions have developed their own charging standards during the development of EVs, this has brought many inconveniences to the cross-regional use of EVs.

[0003] In China, the national standard (GB / T) for DC charging is widely used in the development of electric vehicle charging infrastructure. This standard specifies the physical interface, communication protocol, and electrical parameters between charging piles and electric vehicles. For example, the national standard specifies the interface format of the DC charging plug, the CAN communication protocol used during charging, and the corresponding voltage and current ranges.

[0004] In Europe, the relevant European charging standards are different. For example, European standard vehicles often use the Combined Charging System (CCS) standard, which has significant differences from the national standard in terms of physical interface, communication protocol, and electrical parameters. Specifically, the interface shape and size of the European standard vehicle socket are different from the national standard DC charging gun head. The communication protocol it uses may be PLC (Power Line Communication) or other protocols suitable for Europe, and there may also be specific settings for charging voltage and current requirements.

[0005] When European electric vehicles need to use national standard DC charging piles in China, they cannot be directly charged due to the above-mentioned standard differences. This incompatibility not only limits the travel convenience of electric vehicle users, but also may lead to the waste of charging pile resources.

[0006] Furthermore, with the continuous expansion of the electric vehicle market and the increasing frequency of international exchanges, resolving the compatibility issues between different charging standards has become increasingly urgent. This will not only help improve the efficiency and user satisfaction of electric vehicles, but also promote the healthy development of the global electric vehicle industry. Utility Model Content

[0007] In order to solve the above technical problems, the present application provides a charging converter and a DC charging pile conversion system.

[0008] In the first aspect, the present application proposes a charging adapter, which includes a signal receiving interface, an MCU processor and a signal output interface, wherein:

[0009] a signal receiving interface configured to receive a first communication protocol signal;

[0010] an MCU processor connected to the signal receiving interface and configured to convert the obtained first communication protocol signal into a second communication protocol signal;

[0011] a signal output interface connected to the other end of the MCU processor and configured to output the second communication protocol signal to an electric vehicle;

[0012] The first communication protocol signal and the second communication protocol signal are CAN communication signals and PLC communication signals, or PLC communication signals and CAN communication signals.

[0013] In the above technical solution, the charging conversion head solves the charging compatibility problem between different electric vehicles and charging piles due to the difference in communication protocols. Through the internal MCU processor, the signal is converted, so that whether the charging pile adopts the CAN communication protocol or the PLC communication protocol, effective communication can be carried out with the electric vehicle adopting different protocols, ensuring that the charging process can be started and carried out smoothly, and improving the universality and convenience of the charging facility.

[0014] Further, the MCU processor adopts a GD32F450VIT6 master control chip. The GD32F450VIT6 master control chip has high-performance processing capability and rich peripheral interface.

[0015] In a second aspect, the application provides a direct current charging pile conversion system, which comprises a direct current charging pile, an interface conversion gun and the above charging conversion head. The interface conversion gun is a national standard gun head or a European standard gun head.

[0016] In the above technical solution, the system realizes the compatibility of the direct current charging pile between the national standard and the European standard by integrating the interface conversion gun of different standards and the charging conversion head with the communication protocol conversion function. Whether the national standard vehicle uses the European standard charging pile or the European standard vehicle uses the national standard charging pile, effective physical connection and communication connection can be achieved through the system, greatly improving the utilization rate of the charging pile and facilitating the charging needs of electric vehicle users in different regions.

[0017] Further, the direct current charging pile comprises a power management unit and a voltage conversion unit connected to each other. The voltage conversion unit is configured to convert the voltage levels of each power module in the power management unit. With the setting of the power management unit and the voltage conversion unit, the direct current charging pile can flexibly adjust the voltage of different power modules inside the system.

[0018] Further, the power management unit comprises an auxiliary power supply module and a lithium battery module connected in sequence.

[0019] Further, the voltage conversion unit comprises a BUCK voltage reduction module and a BOOST voltage increase module, the auxiliary power supply module is connected with the lithium battery module through the BUCK voltage reduction module, and the lithium battery module is connected with the signal receiving interface and the MCU processor through the BOOST voltage increase module.

[0020] Further, the power management unit further comprises an isolation power supply module, the lithium battery module is powered for the signal receiving interface through the BOOST voltage increase module and the isolation power supply module, and the auxiliary power supply module is powered for the isolation power supply module through the BUCK voltage reduction module and / or the lithium battery module is powered for the isolation power supply module through the BOOST voltage increase module.

[0021] Further, the voltage conversion unit further comprises an LDO voltage reduction module, the lithium battery module is connected with the MCU processor through the BOOST voltage increase module and the LDO voltage reduction module, the auxiliary power supply module is connected with the LDO voltage reduction module through the BUCK voltage reduction module, and / or the lithium battery module is connected with the LDO voltage reduction module through the BOOST voltage increase module.

[0022] Further, the direct current charging pile further comprises a high-voltage direct current voltage increase module, and the high-voltage direct current voltage increase module is used for receiving a control signal of the MCU processor to perform voltage increase conversion on the direct current power supply.

[0023] Further, the direct current charging pile further comprises a CP detection module in communication connection with the MCU processor.

[0024] Compared with the prior art, the beneficial results of the utility model are as follows:

[0025] 1. The application can realize the conversion between CAN communication signals and PLC communication signals by setting a signal receiving interface, an MCU processor and a signal output interface in the charging conversion head, solves the compatibility problem between different communication protocols. Moreover, the DC charging pile conversion system is equipped with an interface conversion gun of a national standard or a European standard gun head, so that the system can adapt to electric vehicles and charging piles of different standards, greatly improves the universality of the charging facility, facilitates the charging needs of users in different scenes, and reduces the trouble caused by the non-uniform standards.

[0026] 2. The power management unit and the voltage conversion unit in the DC charging pile work closely to ensure that each component works at the appropriate voltage. At the same time, the combination of the auxiliary power supply module and the lithium battery module provides stable and reliable power supply for the system. When the external power supply fluctuates or is powered off, the lithium battery module can maintain the basic operation of the system. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings provide further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and serve to explain the principles of the present application. It will be readily appreciated that other embodiments and many of the intended advantages of the embodiments will become better understood because they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale. The same reference numbers refer to corresponding similar components.

[0028] Figure 1 is a schematic diagram of the application scene of the charging conversion head according to the present application;

[0029] Figure 2 is a partial enlarged view of A of the charging conversion head according to the present application;

[0030] Figure 3 is a schematic diagram of the structure of the charging conversion head according to the present application;

[0031] Figure 4 is a schematic diagram of the overall framework of the DC charging pile conversion system according to the present application;

[0032] Figure 5 is a national standard charging pile charging application scene for a European standard electric vehicle according to the present application;

[0033] Figure 6 is a framework diagram of the DC charging pile conversion system according to one embodiment of the present application;

[0034] Figure 7 is a wiring principle schematic diagram of the CAN communication module according to the present application;

[0035] Figure 8It is a wiring principle schematic diagram of the isolation power module according to the utility model;

[0036] Figure 9 It is a wiring principle schematic diagram of the lithium battery charging module according to the utility model;

[0037] Figure 10 It is a wiring principle schematic diagram of the BUCK voltage reduction module according to the utility model;

[0038] Figure 11 It is a wiring principle schematic diagram of the BOOST voltage increase module according to the utility model;

[0039] The meaning of each number in the figure: 100-charging conversion head, 101-signal receiving interface, 102-MCU processor, 103-signal output interface, 200-power management unit, 201-assistant power supply module, 202-lithium battery module, 204-isolation power module, 300-CP detection module, 400-high voltage direct current voltage increase module, 500-direct current charging pile, 501-charging gun, 600-interface conversion gun. DETAILED DESCRIPTION

[0040] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration illustrative embodiments in which the application can be practiced. To this end, directional terminology, such as "top," "bottom," "left," "right," "above," "below," and the like, is used with reference to the orientation of the described figures. Because components of embodiments can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments can be utilized and logical changes can be made without departing from the scope of the present application. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present application is defined by the appended claims.

[0041] In a first aspect, the utility model provides a charging conversion head, its application scene reference Figure 1 And Figure 2 , Figure 1 And Figure 2 Respectively show the application scene schematic diagram and the partial enlarged view of A of the charging conversion head according to the utility model, as Figure 1 And Figure 2 Show, direct current charging pile 500 is connected to charging conversion head 100 through charging gun 501, and charging conversion head 100 is connected to electric automobile through interface conversion gun 600, forms a complete charging connection path.

[0042] Continue to refer to Figure 3 , Figure 3 Show the structure schematic diagram of the charging conversion head according to the utility model, combineFigures 1-3 As shown, the charging conversion head 100 includes a signal receiving interface 101, an MCU processor 102 and a signal output interface 103. The signal receiving interface 101 is detachably connected with the charging gun 501, used for receiving the first communication protocol signal from the direct current charging pile 500, after the protocol conversion processing by the MCU processor 102, the converted second communication protocol signal is sent to the electric vehicle through the signal output interface 103, through the interface conversion gun 600. Wherein, the signal receiving interface 101 is connected with the signal output interface 103 through the MCU processor 102, the first communication protocol signal and the second communication protocol signal are CAN communication signal and PLC communication signal respectively, or PLC communication signal and CAN communication signal.

[0043] In the second aspect, the utility model provides a charging conversion head and direct current charging pile conversion system, refer to Figure 4 , Figure 4 The overall frame schematic diagram of the direct current charging pile conversion system according to the utility model is shown, combined Figure 1 、 Figure 3 and Figure 4 As shown, the system includes a direct current charging pile 500, an interface conversion gun 600 and a charging conversion head 100, the direct current charging pile 500 includes a power management unit 200, a voltage conversion unit CP detection module 300 and a high-voltage DC boost module 400 connected with each other, and the MCU processor 102 is respectively connected with the CP detection module 300 and the high-voltage DC boost module 400. The voltage conversion unit is used for voltage level conversion of the auxiliary power supply module 201, the lithium battery module 202 and the isolation power supply module 204 in the power management unit 500. The voltage conversion unit includes a BUCK voltage reduction module, a BOOST voltage boost module and an LDO voltage reduction module, the auxiliary power supply module 201 is connected with the lithium battery module 202, the isolation power supply module 204 and the LDO voltage reduction module through the BUCK voltage reduction module, the lithium battery module 202 is connected with the signal receiving interface 101 and the MCU processor 102 through the BOOST voltage boost module, and the lithium battery module 202 supplies power for the signal receiving interface through the isolation power supply module 204. The lithium battery module 202 is connected with the MCU processor 102 through the LDO voltage reduction module. The MCU processor 102 is connected with the high-voltage DC boost module 400, and outputs an accurate control signal to drive the high-voltage DC boost module to boost the input high-voltage DC power, the CP detection module 300 adopts the circuit structure disclosed in CN214138295U, can generate a PWM rectangular wave voltage meeting the system demand, is used for transmission and interaction of CP signal, accurately monitors the signal, and feedbacks the detection result to the MCU processor 102 in the form of digital or analog signal.

[0044] The specific application scene of the DC charging pile conversion system of one embodiment is as follows Figure 5 , Figure 5 The application scene of the GB / T charging pile for the CCS2 European standard electric vehicle is shown, as shown in the figure, the GB / T DC charging pile is connected with the GB / T DC charging gun head through the cable assembly, the transmission of the electric energy from the charging pile to the charging gun head is realized, the GB / T DC charging gun head is inserted into the GB / T interface end of the GB / T to CCS2 conversion adapter, the CCS2 interface end of the GB / T to CCS2 conversion adapter is connected with the CCS2 gun head, and the CCS2 gun head is connected with the CCS2 vehicle socket again, so that the electric energy is transmitted from the GB / T DC charging pile to the CCS2 vehicle socket, and finally the CCS2 European standard electric vehicle is charged. In the charging process, the control signal is transmitted between the GB / T DC charging pile and the GB / T DC charging gun head through the CAN communication protocol, the CAN signal is transmitted to the CCS2 vehicle socket through the CCS2 gun head, and finally the signal interaction with the charging control system of the CCS2 European standard electric vehicle is realized, so that the control and management of the charging process are realized. The GB / T DC charging pile is a DC charging pile meeting the Chinese national standard (GB / T), which is a power supply source, the cable assembly is used for connecting the GB / T DC charging pile and the GB / T DC charging gun head, and the GB / T to CCS2 conversion adapter and the CCS2 vehicle socket, and plays a role in electric energy and signal transmission, the CCS2 vehicle socket meets the European standard (such as CCS2 related standard), is installed on the CCS2 European standard electric vehicle, and is used for receiving electric energy and control signal for vehicle charging, and the CCS2 European standard electric vehicle represents the electric vehicle meeting the CCS2 European standard, which is the final power equipment. Specifically, the identification of the GB / T to CCS2 conversion adapter is GB / T to CCS2, which is a key component for realizing the conversion from GB / T to CCS2, has a GB / T27930 standard interface matched with the GB / T DC charging gun head and an IEC15118 interface matched with the CCS2 vehicle socket, and the CCS2 gun head is connected with the GB / T to CCS2 conversion adapter and is a transition component connected with the CCS2 vehicle socket.

[0045] Further, the application scene of the DC charging pile conversion system according to the utility model is as follows Figure 6 , Figure 6 The frame diagram of the DC charging pile conversion system according to the utility model is shown as Figure 6As shown, in the case of a national standard DC pile charging a European standard electric vehicle, the 12V auxiliary power supply of the national standard DC charging pile supplies power to the lithium battery charging module, the isolation power supply module and the LDO voltage reduction module through the BUCK voltage reduction module, and the lithium battery charging module provides power for the 3.7V lithium battery power supply module. The 3.7V lithium battery power supply module is connected to the LDO voltage reduction module and the isolation power supply module through the BOOST voltage increase module, and the LDO voltage reduction module is connected to the MCU main control chip. The CAN signal input of the national standard charging gun and the PLC signal output of the European standard charging gun are connected to the MCU main control chip. The isolation power supply module is connected between the 12V auxiliary power supply and the signal receiving port, and the CP detection circuit and the high-voltage DC voltage request signal voltage increase module are connected to the MCU main control chip. The whole system achieves the conversion between different charging protocols through the cooperative operation of these modules. The CAN signal input is connected to the CAN communication line of the national standard charging gun head, which is used to receive the CAN signal from the national standard DC charging pile. The MCU processor uses a high-performance microcontroller chip to analyze, convert and process the received CAN signal to meet the communication protocol requirements of the European standard vehicle; the PLC signal output is connected to the communication line of the European standard vehicle socket, and the signal processed by the MCU processor is output to the European standard vehicle in the form of PLC signal.

[0046] Specifically, the main control chip of the MCU processor is GD32F450VI T6, which is used to connect with multiple modules / units, receive and process signals, and coordinate the work of each module / unit. When the CAN signal of the national standard charging gun head is transmitted to the MCU processor through the CAN communication module, the CAN signal will be sent to the corresponding input pin. Once the signal enters the chip, the internal logic circuit will process the signal according to the pre-set program and algorithm. For the received CAN signal, the chip first decodes the signal and identifies the charging parameters (such as charging current, voltage setting value) and control instructions (such as charging start / stop signal) contained therein. According to the charging requirements and communication protocol requirements of the European standard vehicle, the chip will convert and adjust these parameters and instructions. The processed signal will be output to the output pin of the PLC communication module. The output pin sends the converted signal to the PLC communication module for further transmission to the European standard vehicle. In addition, the MCU processor can also control other modules, and sends control signals to the pins related to the control of the high-voltage DC voltage increase module or other voltage conversion modules to adjust the voltage output of the system to meet the different needs in the charging process. At the same time, it also interacts with the storage chip to store and read the relevant data in the charging process for subsequent analysis and management.

[0047] With reference to Figure 7 and Figure 8 , Figure 7 andFigure 8 The wiring principle schematic diagram of the CAN communication module and the isolation power supply unit according to the utility model is shown respectively, as shown in the figure, the power supply after the YLPTEC (Yi Chuan) B0505LS-1WR3 chip processing is powered for CAN isolation chip in TII SO1050DUBR chip. Figure 7 The chip is located in the center of the circuit diagram and is the core component of the entire circuit. It has 8 pins, which are marked as 1 to 8 respectively. Pin 1 is connected to a 3.3V power supply to provide power for the chip. Pins 2 and 3 are RX (receive) and TX (transmit) pins respectively, used for receiving and transmitting data. Pin 4 is connected to GND (ground) to provide a ground connection. Pins 6 and 7 are CANL (CAN low) and CANH (CAN high) pins respectively, used for CAN bus communication. Pin 8 is connected to a CAN 5V power supply to provide a 5V power supply for CAN communication. Two TVS (Transient Voltage Suppression) diodes are marked as TVS1 and TVS2 respectively. TVS1 is connected between the CANL pin (pin 7 of the chip) and TVS2 is connected between the CANH pin (pin 6 of the chip) and ground. The diodes are used to protect the circuit from transient voltage and prevent voltage spikes from damaging the chip. The CAN bus consists of two lines: CANH and CANL. The CANH line is connected from pin 7 of the chip to an inductor, and then through a resistor to the S+ (positive signal) terminal. The CANL line is connected from pin 6 of the chip to another inductor, and then through a resistor to the S- (negative signal) terminal. These inductors and resistors are used for signal filtering and matching to ensure the stability and reliability of CAN bus communication. The TII SO1050DUBR chip isolates and processes the received CAN signal, which electrically isolates the CAN signal from the national standard charging gun head, preventing external interference from affecting the subsequent circuit. At the same time, some necessary conversion is performed on the signal to meet the receiving requirements of the MCU processor, and the processed CAN signal is output from the TII SO1050DUBR chip and transmitted to the MCU processor for further analysis and processing.

[0048] Specifically, in the national standard and European standard electric vehicle charging adapter system, the PLC communication module adopts a QCA7000 EVSE module purchased from outside, and the PLC communication module is preferably a QCA7000 HomePlug GreenPHY broadband power line carrier PLC module ISO15118, which realizes outputting the signal meeting the European standard vehicle communication protocol requirements to the European standard vehicle socket in the form of PLC signal after the MCU processor processes the signal.

[0049] Further combining Figures 9-11 , Figures 9-11The wiring diagrams of the lithium battery charging module, BUCK step-down unit and BOOST step-up unit are shown respectively. Figure 9 As shown, the lithium-ion battery charging module includes the AP5056 core chip, which has multiple pins, including VCC, BAT, TEMP, PROG, and GND. The power management unit also integrates an isolated power supply module that provides isolated power to the CAN communication unit. The auxiliary power is charged by the BUCK step-down module to the lithium-ion battery module, and then further provided by the BOOST step-up module to provide the appropriate voltage for the isolated power supply module and the MCU processor. The voltage conversion module is also equipped with a high-precision LDO step-down module to effectively stabilize the input voltage of the MCU processor, ensuring stable operation in complex electromagnetic environments.

[0050] Further references Figure 10 The BUCK step-down module is used to reduce the higher voltage from the auxiliary power supply of the national standard DC charging pile to the appropriate voltage value required by the system. It uses the AP2962B step-down chip and adjusts the output voltage by controlling the chip's duty cycle. When the EN pin of the AP2962B chip meets the conditions and the input voltage is applied to the VIN pin, the switching circuit inside the chip begins to operate. The internal switch tube is periodically turned on and off. When the switch tube is on, the input voltage charges the inductor, the inductor current rises linearly, and the capacitor discharges to the load. When the switch tube is off, the inductor discharges to the capacitor and load through the diode, maintaining the output voltage. The FB pin is connected to the feedback circuit through the connected resistor, monitoring the output voltage in real time and feeding the feedback signal back to the control circuit inside the chip. The control circuit adjusts the on and off time (duty cycle) of the switch tube based on the feedback signal, thereby achieving precise control of the output voltage and reducing the input voltage to the appropriate value.

[0051] Continue to refer Figure 11 The BOOST module is used to boost the lower lithium battery voltage to a higher voltage suitable for certain system modules. It utilizes the ME2185ASPG boost chip and peripheral circuitry, controlling the output voltage by adjusting the chip's duty cycle. When the chip's enable (EN) pin meets the conditions and the input voltage, derived from the lithium battery's VBAT, is applied to the corresponding pin, the chip's internal switch begins to cycle on and off. When the switch is on, the input voltage charges the inductor, causing the inductor current to rise linearly. At this point, the diode turns off, allowing the capacitor to discharge through the load, maintaining the output voltage. When the switch is off, the inductor generates a reverse electromotive force, which, combined with the input voltage, charges the capacitor through the diode, thereby boosting the voltage.

[0052] The LDO step-down module is used to further stabilize the voltage after step-down or step-up processing, providing a stable operating voltage for MCU processors that have high requirements for voltage stability.

[0053] Another embodiment proposed by the present invention is that a European standard DC charging pile charges a national standard electric vehicle, that is, the first communication protocol signal of the signal receiving interface is a PLC communication signal, the second communication protocol signal of the signal output interface is a CAN communication signal, and the interface conversion gun is a national standard gun head. Specifically, the principle of charging a national standard electric vehicle with a European standard DC charging pile is essentially the same as the principle of charging a European standard electric vehicle with a national standard DC charging pile. Both are based on the core idea of ​​communication protocol conversion, and the communication adaptation between charging piles of different standards and vehicles is achieved through the conversion and processing of different protocol signals by the MCU processor. In terms of circuit design, although there may be differences in the parameters of some circuit components for different signal types and conversion directions, the overall design ideas and architecture are similar. In order to maintain the simplicity of the specification, reference can be made here to the detailed explanation of the circuit design principles, signal processing procedures, etc. in the specific scheme of charging a European standard electric vehicle with a national standard DC charging pile. Its basic principles and design methods are also applicable to the situation in which a European standard DC charging pile charges a national standard electric vehicle in this embodiment.

[0054] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and changes are within the scope of the claims of the present invention and their equivalents, the present invention is also intended to cover these modifications and changes. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are recited in mutually different dependent claims does not indicate that the combination of these measures cannot be used to advantage. Any reference signs in the claims should not be considered as limiting the scope.

Claims

1. A charging adapter, characterized in that: The charging conversion head includes a signal receiving interface, an MCU processor and a signal output interface, wherein: The signal receiving interface is used to receive a first communication protocol signal; The MCU processor is connected to the signal receiving interface and is used to convert the acquired first communication protocol signal into a second communication protocol signal, where the first communication protocol signal and the second communication protocol signal are respectively a CAN communication signal and a PLC communication signal, or a PLC communication signal and a CAN communication signal; The signal output interface is connected to the other end of the MCU processor and is used to output the second communication protocol signal to the electric vehicle.

2. A charging adapter according to claim 1, characterized in that: The MCU processor adopts the GD32F450VIT6 main control chip.

3. A DC charging pile conversion system, characterized in that: The system includes a DC charging pile, an interface conversion gun, and a charging conversion head according to any one of claims 1 to 2, wherein the interface conversion gun is a gun head that complies with national standards or European standards.

4. A DC charging pile conversion system according to claim 3, characterized in that: The DC charging pile includes a power management unit and a voltage conversion unit that are connected to each other. The voltage conversion unit is used to convert the voltage levels of each power module in the power management unit.

5. A DC charging pile conversion system according to claim 4, characterized in that: The power management unit includes an auxiliary power supply module and a lithium battery module which are connected in sequence.

6. A DC charging pile conversion system according to claim 5, characterized in that: The voltage conversion unit includes a BUCK step-down module and a BOOST step-up module. The auxiliary power supply module is connected to the lithium battery module via the BUCK step-down module. The lithium battery module is connected to the signal receiving interface and the MCU processor respectively through the BOOST step-up module.

7. A DC charging pile conversion system according to claim 6, characterized in that: The power management unit also includes an isolated power supply module. The lithium battery module is boosted and converted by the BOOST boost module and then supplies power to the signal receiving interface through the isolated power supply module. The auxiliary power supply module supplies power to the isolated power supply module through the BUCK step-down module, and / or the lithium battery module supplies power to the isolated power supply module through the BOOST boost module.

8. A DC charging pile conversion system according to claim 6, characterized in that: The voltage conversion unit also includes an LDO step-down module. The lithium battery module is connected to the MCU processor via the BOOST step-up module via the LDO step-down module. The auxiliary power supply module is connected to the LDO step-down module via the BUCK step-down module, and / or the lithium battery module is connected to the LDO step-down module via the BOOST step-up module.

9. A DC charging pile conversion system according to claim 4, characterized in that: The DC charging pile further includes a high-voltage DC boost module, which is used to receive a control signal from the MCU processor to perform a boost conversion on the DC power supply.

10. A DC charging pile conversion system according to claim 4, characterized in that: The DC charging pile further includes a CP detection module communicatively connected to the MCU processor.

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