Direct current charging auxiliary power supply isolation system for new energy automobile and control method

Abstract

The invention provides a DC charging auxiliary power supply isolation system for a new energy automobile and a control method, and belongs to the technical field of automobile charging safety, and the DC charging auxiliary power supply isolation system comprises a charging pile control module, a charging pile auxiliary power supply module, an interface module, an isolation module, a vehicle control module and an automobile auxiliary power supply module, the charging pile control module is used for controlling power output of the charging pile auxiliary power module, the output end of the charging pile auxiliary power module is connected with the input end of the isolation module through the interface module, and the output end of the automobile auxiliary power module is connected with the input end of the vehicle control module through the isolation module. When an automobile is charged, an automobile plug in the interface module is connected with an automobile socket; the charging pile controller controls the auxiliary power output relay to be closed after a user swipes a card, the charging pile auxiliary power module controls the isolation module to be closed, the automobile auxiliary power module supplies power to the automobile control module, and the automobile control module controls an automobile to be charged. According to the invention, the safety and compatibility of automobile charging are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicle charging safety. Specifically, the present invention relates to an isolation system and control method for a DC charging auxiliary power supply of a new energy vehicle. Background Art

[0002] With the global emphasis on environmental protection and sustainable development, the new energy vehicle industry has developed rapidly. As the core supporting facility of new energy vehicles, the safety and stability of the charging system are directly related to the user experience, vehicle safety, and the healthy development of the entire new energy industry chain. However, in the existing new energy vehicle charging system, the direct connection between the charging pile auxiliary power supply and the vehicle low-voltage power supply system or the lack of effective isolation measures has become a potential safety hazard.

[0003] Chinese Patent 205256043U discloses a charging pile auxiliary power supply, including a non-vehicle-mounted charger control device, a current source, and a monitoring unit. The non-vehicle-mounted charger control device is connected to the current source for controlling the current output of the current source. The monitoring unit is connected to the output end of the current source for detecting the output voltage of the current source and sending it to the non-vehicle-mounted charger control device.

[0004] The direct connection between the existing charging pile auxiliary power supply and the vehicle low-voltage power supply system or the lack of effective isolation measures may lead to abnormal charging pile control systems, damage to battery management systems, and even safety accidents such as vehicle fuse burning and fires during charging. Summary of the Invention

[0005] The present invention aims to provide an isolation system and control method for a DC charging auxiliary power supply of a new energy vehicle to achieve the technical purpose of improving the charging safety of the vehicle.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides an isolation system for a DC charging auxiliary power supply of a new energy vehicle, including a charging pile control module, a charging pile auxiliary power supply module, an interface module, an isolation module, a vehicle control module, and an automotive auxiliary power supply module. The charging pile control module is used to control the power output of the charging pile auxiliary power supply module. The output end of the charging pile auxiliary power supply module is connected to the input end of the isolation module through the interface module. The output end of the automotive auxiliary power supply module is connected to the input end of the vehicle control module through the isolation module.

[0008] The charging pile auxiliary power supply module outputs a voltage signal to the isolation module, and the automotive auxiliary power supply module outputs power to the vehicle control module through the isolation module.

[0009] The interface module includes a vehicle plug and a vehicle socket.

[0010] The auxiliary power supply module of the charging pile uses an auxiliary power supply of the charging pile. The positive and negative poles of the auxiliary power supply of the charging pile are respectively connected to the vehicle plug in the interface module through a first auxiliary power output relay and a second auxiliary power output relay.

[0011] The charging pile control module uses a charging pile controller, and the charging pile controller is used to control the opening and closing of the first auxiliary power output relay and the second auxiliary power output relay.

[0012] The isolation module uses an isolation relay.

[0013] The vehicle auxiliary power supply module uses a lead-acid battery.

[0014] The positive pole of the lead-acid battery is connected to the input end of the vehicle control module through an isolation relay.

[0015] The vehicle control module uses a vehicle controller, and the vehicle controller is respectively connected to the vehicle socket and the vehicle power platform in the interface module.

[0016] The present invention provides a control method for an isolation system of an auxiliary power supply for DC charging of a new energy vehicle: when the vehicle is charging, the vehicle plug and the vehicle socket in the interface module are connected; after the user swipes the card, the charging pile controller controls the first auxiliary power output relay and the second auxiliary power output relay to close, the power supply output by the auxiliary power supply module of the charging pile controls the isolation module to close, the vehicle auxiliary power supply module supplies power to the vehicle control module and wakes it up, and the vehicle control module controls the vehicle to charge.

[0017] The technical effects of the present invention are as follows:

[0018] (1) By introducing an isolation relay, the present invention establishes a physical isolation between the auxiliary power supply of the charging pile and the vehicle low-voltage system, effectively preventing potential safety hazards such as current backflow and voltage fluctuations, and protecting the safety of the vehicle control module and the vehicle auxiliary power supply module. In the case where the grounding system of the charging pile fails or the grounding is poor, resulting in the ground wire being charged, the isolation relay can prevent the direct impact of the charged ground wire on the vehicle low-voltage system, avoiding serious consequences such as fires and equipment damage caused by electrical faults.

[0019] (2) Regardless of whether the charging pile of the present invention is a 24V system or a 12V system, it will ultimately be converted into the 12V power required by the vehicle through the vehicle auxiliary power supply module and the isolation relay to supply power to the vehicle and wake it up for charging. When the user is charging, there is no need to deliberately select a charging pile that matches the vehicle for charging, and there is no need to worry about damage to the vehicle low-voltage system due to incompatibility between the vehicle and the auxiliary power supply of the charging pile.

[0020] (3) The present invention improves the charging convenience and user experience. Users no longer need to worry about the matching problem between the vehicle and the charging pile, and do not need to deliberately select a charging pile of a specific brand for charging.

[0021] (4) The present invention reduces the maintenance cost. Since the present invention improves the safety and compatibility of the charging system, it reduces the equipment damage and maintenance cost caused by electrical faults.

[0022] (5) The present invention promotes market penetration. By improving the charging convenience and user experience of new energy vehicles, the present invention helps to promote the market penetration of new energy vehicles and promote the healthy development of the new energy vehicle industry. Description of the Drawings

[0023] This specification includes the following drawings, and the shown contents are respectively:

[0024] Figure 1 It is a logic structure block diagram of an isolation system and control method for the DC charging auxiliary power supply of a new energy vehicle according to the present invention;

[0025] Figure 2 It is a schematic diagram of an isolation system and control method for the DC charging auxiliary power supply of a new energy vehicle according to the present invention;

[0026] Figure 1 In the figure, the markings are: 1, charging pile control module; 2, charging pile auxiliary power supply module; 3, interface module; 4, isolation module; 5, vehicle control module; 6, vehicle auxiliary power supply module. Detailed Embodiments

[0027] The following is a more detailed description of the specific embodiments of the present invention with reference to the drawings and through the description of the embodiments, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitate its implementation.

[0028] The present invention provides an isolation system for the DC charging auxiliary power supply of a new energy vehicle, which includes a charging pile control module 1, a charging pile auxiliary power supply module 2, an interface module 3, an isolation module 4, a vehicle control module 5, and a vehicle auxiliary power supply module 6. The charging pile control module 1 is used to control the power output of the charging pile auxiliary power supply module 2. The output end of the charging pile auxiliary power supply module 2 is connected to the input end of the isolation module 4 through the interface module 3. The output end of the vehicle auxiliary power supply module 6 is connected to the input end of the vehicle control module 5 through the isolation module 4.

[0029] The charging pile auxiliary power supply module 2 outputs a voltage signal to the isolation module 4, and the vehicle auxiliary power supply module 6 outputs power to the vehicle control module 5 through the isolation module 4. The interface module 3 includes a vehicle plug and a vehicle socket. The charging pile auxiliary power supply module 2 uses the charging pile auxiliary power supply. The positive and negative poles of the charging pile auxiliary power supply are respectively connected to the vehicle plug in the interface module 3 through the first auxiliary power output relay and the second auxiliary power output relay. The charging pile control module 1 uses a charging pile controller, and the charging pile controller is used to control the opening and closing of the first auxiliary power output relay and the second auxiliary power output relay. The isolation module 4 uses an isolation relay. The vehicle auxiliary power supply module 6 uses a lead-acid battery. The positive pole of the lead-acid battery is connected to the input end of the vehicle control module 5 through the isolation relay. The vehicle control module 5 uses a vehicle controller, and the vehicle controller is respectively connected to the vehicle socket and the vehicle power platform in the interface module 3.

[0030] The present invention provides a control method for a DC charging auxiliary power supply isolation system of a new energy vehicle. When the vehicle is charging, the vehicle plug and the vehicle socket in the interface module 3 are connected; after the user swipes the card, the charging pile controller controls the first auxiliary power output relay and the second auxiliary power output relay to close. The power output by the charging pile auxiliary power supply module 2 controls the isolation module 4 to close. The vehicle auxiliary power supply module 6 supplies power to the vehicle control module and wakes it up, and the vehicle control module 5 controls the vehicle to charge.

[0031] The following details a DC charging auxiliary power supply isolation system and a control method for a new energy vehicle according to the present invention.

[0032] A DC charging auxiliary power supply isolation system for a new energy vehicle according to the present invention includes a charging pile control module 1, a charging pile auxiliary power supply module 2, an interface module 3, an isolation module 4, a vehicle control module 5, and a vehicle auxiliary power supply module 6. The charging pile control module 1 uses a charging pile controller, and the charging pile controller is used to receive a charging instruction and control the output of the charging pile auxiliary power supply module 2. In an embodiment of the present invention, when the charging pile controller receives a control signal generated when the user swipes the card, the charging pile controller controls the auxiliary power output relay to close, thereby controlling the power output of the charging pile auxiliary power supply module 2. The charging pile controller of the present invention uses a TMS320F280049C microcontroller.

[0033] The charging pile auxiliary power supply module 2 uses the charging pile auxiliary power supply to control the isolation module 4. The voltage of the charging pile auxiliary power supply of the present invention can be 12V or 24V. Ultimately, the charging pile auxiliary power supply will provide power supply and charging wake-up for the vehicle control module 5 by controlling the vehicle auxiliary power supply module 6 through the isolation module 4. When the user is charging, there is no need to deliberately select a charging pile that matches the vehicle for charging, and there is no need to worry about the problem of the vehicle being damaged due to incompatibility with the charging pile auxiliary power supply. The present invention realizes seamless docking between charging piles of different brands and improves the charging compatibility of new energy vehicles.

[0034] The interface module 3 includes a vehicle plug and a vehicle socket, that is, a charging gun interface and an automotive charging interface. When the vehicle is charging, the user first needs to connect the vehicle plug and the vehicle socket. The present invention controls the isolation module 4 through the power input of the charging pile auxiliary power supply module 2 at the A+ interface and the A- interface in the vehicle plug and the vehicle socket, and then controls the power input of the vehicle auxiliary power supply module 6 to the vehicle control module 5 through the isolation module 4.

[0035] The isolation module 4 uses an isolation relay to control the power input of the vehicle auxiliary power supply module 6 to the vehicle control module. Specifically, the power input at the A+ interface and the A- interface in the vehicle plug and the vehicle socket in the interface module 3 is input to the drive coil in the isolation relay. When the isolation relay closes, the vehicle auxiliary power supply module 6 inputs power to the vehicle control module. The isolation relay establishes a physical isolation between the charging pile auxiliary power supply and the vehicle low-voltage system, effectively preventing safety hazards such as current backflow and voltage fluctuations, and protecting the safety of the vehicle control module 5 and the vehicle auxiliary power supply module 6.

[0036] The vehicle control module 5 uses a vehicle controller. The vehicle controller is used to control the charging of the vehicle. After receiving the power input from the vehicle auxiliary power supply module 6, the vehicle controller wakes up for charging and controls the vehicle to charge. The vehicle controller in the embodiment of the present invention is a TLE9018DQK AFE chip.

[0037] The vehicle auxiliary power supply module 6 uses a 12V lead-acid battery to supply power to the vehicle control module 5 and wake up for charging.

[0038] The following details the connection relationship of the present invention.

[0039] The following combines Figure 2Specifically, the output end of the charging pile controller (101) is respectively connected to the coils on the first auxiliary power output relay (103) and the second auxiliary power output relay (104). The output end of the charging pile auxiliary power supply (102) is respectively connected to the input sides of the first auxiliary power output relay (103) and the second auxiliary power output relay (104). The output sides of the first auxiliary power output relay (103) and the second auxiliary power output relay (104) are respectively connected to the A+ interface and the A- interface of the vehicle plug (105) in interface module 3. The drive coils of the isolation relay (107) are respectively connected to the A+ interface and the A- interface of the vehicle socket (106) in interface module 3. The input side of the isolation relay (107) is connected to the positive pole of the lead-acid battery (108), and the output side of the isolation relay (107) is connected to the input end of the vehicle controller (109). The vehicle controller is respectively connected to the PE interface of the vehicle socket (106) in interface module 3 and the vehicle power platform (110).

[0040] The following details a control method for the isolation system of the DC charging auxiliary power supply of a new energy vehicle according to the present invention.

[0041] When the vehicle is charging, the vehicle plug and the vehicle socket in interface module 3 are connected, that is, the charging gun interface and the vehicle charging interface are connected. The A+ interface and the A- interface on the vehicle plug are connected to the A+ interface and the A- interface on the vehicle socket. At this time, the isolation relay is not closed, the vehicle control module 5 is not powered and awakened by charging, and the vehicle does not enter the charging preparation process. After the user swipes the card, the charging pile control module 1 controls the first auxiliary power output relay and the second auxiliary power output relay to close. The charging pile auxiliary power supply outputs 12V or 24V power. There is a 12V or 24V voltage between the A+ interface and the A- interface of interface module 3. The drive coil of the isolation relay is energized, and the main contact of the isolation relay is closed. The vehicle auxiliary power supply module 6 supplies power to the vehicle control module and wakes it up. After the vehicle control module 5 is powered on, it enters the charging preparation process and starts charging after completing the interaction with the vehicle.

[0042] By introducing an isolation relay, the present invention establishes physical isolation between the charging pile auxiliary power supply and the vehicle low-voltage system, effectively preventing safety hazards such as current backflow and voltage fluctuations, and protecting the safety of the vehicle control module 5 and the vehicle auxiliary power supply module 6.

[0043] In the case where the grounding system of the charging pile fails or the grounding is poor, resulting in the ground wire being charged, the isolation relay can prevent the direct impact of the charged ground wire on the vehicle low-voltage system, avoiding serious consequences such as fires and equipment damage caused by electrical failures.

[0044] Regardless of whether it is a 24V system or a 12V system, the charging pile of the present invention will ultimately be converted into the 12V power supply required by the vehicle through the vehicle auxiliary power supply module 6 and the isolation relay to supply power to the vehicle and wake up the charging. When charging, users do not need to deliberately select a charging pile that matches the vehicle for charging, and do not have to worry about the problem of the vehicle's low-voltage system being damaged due to the mismatch between the vehicle and the auxiliary power supply of the charging pile.

[0045] The present invention improves the charging convenience and user experience. Users no longer have to worry about the matching problem between the vehicle and the charging pile, and do not need to deliberately select a charging pile of a specific brand for charging.

[0046] The present invention reduces the maintenance cost. Since the present invention improves the safety and compatibility of the charging system, it reduces the equipment damage and maintenance cost caused by electrical faults.

[0047] The present invention promotes market penetration. By improving the charging convenience and user experience of new energy vehicles, the present invention helps to promote the market penetration of new energy vehicles and promote the healthy development of the new energy vehicle industry.

[0048] The present invention has been described exemplarily in combination with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, the above concept and technical solution of the present invention are directly applied to other occasions, they are all within the protection scope of the present invention.

Claims

1. A DC charging auxiliary power isolation system for new energy vehicles, characterized by: It includes a charging pile control module, a charging pile auxiliary power supply module, an interface module, an isolation module, a vehicle control module, and a car auxiliary power supply module. The charging pile control module is used to control the power output of the charging pile auxiliary power supply module. The output end of the charging pile auxiliary power supply module is connected to the input end of the isolation module through the interface module. The output end of the car auxiliary power supply module is connected to the input end of the vehicle control module through the isolation module.

2. A DC charging auxiliary power isolation system for new energy vehicles as claimed in claim 1, characterized in that: The charging pile auxiliary power module outputs a voltage signal to the isolation module, and the automobile auxiliary power module outputs power to the vehicle control module through the isolation module.

3. A DC charging auxiliary power isolation system for new energy vehicles as claimed in claim 1, characterized in that: The interface module includes a vehicle plug and a vehicle socket.

4. A DC charging auxiliary power isolation system for new energy vehicles as claimed in claim 1, characterized in that: The charging pile auxiliary power module adopts a charging pile auxiliary power supply, and the positive and negative electrodes of the charging pile auxiliary power supply are connected to the vehicle plug in the interface module through a first auxiliary power supply output relay and a second auxiliary power supply output relay respectively.

5. A DC charging auxiliary power isolation system for new energy vehicles as claimed in claim 1, characterized in that: The charging pile control module adopts a charging pile controller, and the charging pile controller is used to control the opening and closing of the first auxiliary power output relay and the second auxiliary power output relay.

6. A DC charging auxiliary power isolation system for new energy vehicles as claimed in claim 1, characterized in that: The isolation module adopts an isolation relay.

7. A DC charging auxiliary power isolation system for new energy vehicles as claimed in claim 1, characterized in that: The automobile auxiliary power module adopts a lead-acid battery.

8. A DC charging auxiliary power isolation system for new energy vehicles as described in claim 1, 6 or 7, characterized in that: The positive electrode of the lead-acid battery is connected to the input end of the vehicle control module through an isolation relay.

9. A DC charging auxiliary power isolation system for new energy vehicles as claimed in claim 1, characterized in that: The vehicle control module adopts a vehicle controller, and the vehicle controller is respectively connected to the vehicle socket in the interface module and the vehicle electrical platform.

10. A control method for a DC charging auxiliary power isolation system for a new energy vehicle according to any one of claims 1 to 9, characterized in that: When the car is charging, the vehicle plug in the interface module is connected to the vehicle socket; after the user swipes the card, the charging pile controller controls the first auxiliary power output relay and the second auxiliary power output relay to close, the power output of the charging pile auxiliary power module controls the isolation module to close, the vehicle auxiliary power module supplies power to the vehicle control module and wakes it up, and the vehicle control module controls the car to charge.

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