Centralized electric vehicle wireless charging system and control method thereof

Abstract

The invention discloses a centralized electric vehicle wireless charging system and a control method thereof, the centralized electric vehicle wireless charging system comprises a rectification filtering module, a chopping power regulation module, a high-frequency inversion module, a high-frequency rectification module and a battery pack, one end of the rectification filtering module is connected with the chopping power regulation module through a wire, the chopping power regulation module is connected with the high-frequency inversion module through a wire, and the high-frequency rectification module is connected with the high-frequency inversion module through a wire. The high-frequency inversion module is connected with the high-frequency rectification module through wireless communication, and the high-frequency ballast module is connected with the battery pack through a wire. The invention belongs to the technical field of wireless charging, and particularly relates to a centralized electric vehicle wireless charging system and a control method thereof.

Description

Technical Field

[0001] This invention belongs to the field of wireless charging technology, and particularly relates to a centralized wireless charging system for electric vehicles. Background Technology

[0002] A search revealed, for example, that patent CN112072765B discloses a hybrid charging system and design method based on a minimum apparent power module, including a power module, a centralized control unit, a wired charging circuit, and a wireless charging circuit. This invention determines the coil coupling coefficient of the wireless charging circuit of the hybrid charging system by using the equivalent resistance of the electric vehicle battery during the transition from constant current charging to constant voltage charging, thereby designing the coil inductance and compensation capacitor so that the hybrid charging system can meet wired / wireless charging requirements with a minimum power module.

[0003] The problem with the aforementioned patent is that current water dispensers have reduced the output power of the power module required by the hybrid charging system, making it impossible to maintain a continuous boost in current output, which can easily damage the battery pack. Summary of the Invention

[0004] The technical problem that this invention aims to solve is that existing equipment cannot maintain a continuous boost of current output, which can easily damage the battery pack.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a centralized wireless charging system for electric vehicles, comprising a rectifier and filter module, a chopper power regulation module, a high-frequency inverter module, a high-frequency rectifier module, and a battery pack. One end of the rectifier and filter module is connected to the chopper power regulation module via a wire. The chopper power regulation module is connected to the high-frequency inverter module via a wire. The high-frequency inverter module and the high-frequency rectifier module are connected via wireless communication. The high-frequency ballast module is connected to the battery pack via a wire.

[0006] Furthermore, an overcurrent protection circuit is connected in parallel between the chopper power regulation module and the high-frequency inverter module.

[0007] Furthermore, the high-frequency inverter module is connected in series with capacitor one, and the high-frequency rectifier module is connected in series with capacitor two.

[0008] Furthermore, a frequency tracking module is connected in parallel between the high-frequency inverter module and the capacitor.

[0009] Furthermore, a current sharing control module is connected in parallel between the chopper power regulation module and the high-frequency rectification module.

[0010] Furthermore, the wireless charging system is configured into several groups and connected in parallel.

[0011] The beneficial effects of the present invention after adopting the above structure are as follows:

[0012] The system achieves a constant current charging process where the system output power increases irreversibly from small to large. The system also periodically samples the voltage and current signals of each part. If a fault signal is detected, the main circuit is immediately cut off and the main circuit is connected to perform load detection, thereby protecting the battery pack. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0014] Figure 1 This is a block diagram of the system structure proposed in this invention;

[0015] Figure 2 This is the system control flowchart proposed in this invention.

[0016] In the attached diagram: 1. Rectifier and filter module, 2. Chopper power regulation module, 3. High-frequency inverter module, 4. High-frequency rectifier module, 5. Battery pack, 6. Overcurrent protection circuit, 7. Capacitor 1, 8. Capacitor 2, 9. Frequency tracking module, 10. Current sharing control module. Detailed Implementation

[0017] like Figure 1 As shown, a centralized wireless charging system for electric vehicles includes a rectifier and filter module 1, a chopper power regulation module 2, a high-frequency inverter module 3, a high-frequency rectifier module 4, and a battery pack 5. One end of the rectifier and filter module 1 is connected to the chopper power regulation module 2 via a wire. The chopper power regulation module 2 is connected to the high-frequency inverter module 3 via a wire. The high-frequency inverter module 3 and the high-frequency rectifier module 4 are connected wirelessly. The high-frequency ballast module is connected to the battery pack 5 via a wire.

[0018] Among them, the chopper power adjustment module 2 and the high-frequency inverter module 3 are connected in parallel with an overcurrent protection circuit 6, the high-frequency inverter module 3 is connected in series with a capacitor 7, the high-frequency rectifier module 4 is connected in series with a capacitor 8, the high-frequency inverter module 3 and the capacitor are connected in parallel with a frequency tracking module 9, the chopper power adjustment module 2 and the high-frequency rectifier module 4 are connected in parallel with a current sharing control module 10, and the wireless charging system is set into several groups and connected in parallel with each other.

[0019] A centralized wireless charging system for electric vehicles and its control method are as follows: When a vehicle approaches a station, the communication equipment matches the vehicle's code. Upon detecting the vehicle's entry into the station, the main circuit is immediately connected, and the control circuit is activated. The control circuit performs a self-test. When a fault is encountered, the control circuit issues a fault alarm. When the test is normal, the AC contactor opens, the main circuit is connected, and the circuit is tested for phase loss and undervoltage. When a fault is encountered, the main circuit is de-energized, and phase loss and undervoltage alarms are activated. When the test is normal, the main control board sends a control pulse to the fixed-frequency inverter, controlling the BUCK circuit to soft-start to DC 50V output. When the BUCK switching transistor fails, the main circuit is de-energized, and the BUCK circuit alarm is triggered.

[0020] Then, when the BUCK switch is normal, the inverter output current is detected at the same time, the PLL starts working and switches to soft switching to sample the current. The output current of the BUCK circuit is monitored and it is found that it exceeds the limit. When the inverter switch fails, the main circuit is powered off and an inverter fault alarm is triggered. When the inverter switch is normal, the BUCK pulse is blocked and the BUCK circuit is cyclically soft-started to regulate the voltage.

[0021] The wireless communication receiving module performs code pairing. When the wireless communication receiving module malfunctions, the main circuit is powered off and a wireless communication fault alarm is triggered. When the wireless communication receiving module is functioning normally, the BUCK duty cycle is gradually increased based on the signal. When the limit is exceeded, the BUCK duty cycle is continuously increased. When the limit is exceeded, the circuit switches back to inverter switching transistor fault detection.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents. In conclusion, if those skilled in the art, inspired by this description, design similar structural methods and embodiments without departing from the inventive spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A centralized wireless charging system for electric vehicles, characterized in that: It includes a rectifier and filter module, a chopper power regulation module, a high-frequency inverter module, a high-frequency rectifier module, and a battery pack. One end of the rectifier and filter module is connected to the chopper power regulation module via a wire. The chopper power regulation module is connected to the high-frequency inverter module via a wire. The high-frequency inverter module and the high-frequency rectifier module are connected via wireless communication. The high-frequency ballast module is connected to the battery pack via a wire.

2. The centralized wireless charging system for electric vehicles according to claim 1, characterized in that: An overcurrent protection circuit is connected in parallel between the chopper power regulation module and the high-frequency inverter module. A capacitor is connected in series with the high-frequency inverter module, and a capacitor is connected in series with the high-frequency rectifier module. A frequency tracking module is connected in parallel between the high-frequency inverter module and the capacitor. A current sharing control module is connected in parallel between the chopper power regulation module and the high-frequency rectifier module. The wireless charging system is configured into several groups and connected in parallel with each other.

3. The control method for a centralized wireless charging system for electric vehicles according to claim 1, characterized in that: S1. First, the circuit starts up, the control circuit is powered on, the control circuit performs a self-test, the AC contactor operates and the main circuit is powered on. S2. Next, the main control board sends control pulses to the fixed-frequency inverter circuit to monitor phase loss and undervoltage in the circuit. S3, BUCK circuit soft start to DC50V output, detect BUCK switching transistor faults and monitor inverter output current, PLL works, switches to soft switching, samples and monitors BUCK output current, identifies inverter switching transistor faults, and realizes BUCK pulse blocking; S4. When the BUCK output current does not exceed the limit, the wireless communication receiving module performs a code pairing test, gradually increases the BUCK duty cycle through feedback signals, and then determines again that the BUCK output current exceeds the limit.

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