EV Charge Control System Reducing Common-Mode Voltage
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Solution Overview
Problem
Current electric vehicle charging systems require long charging times, are costly, and have limited space and usability due to high hardware costs and the need for dedicated charging stations, especially when accommodating different grid systems and connection modes.
Innovation Solution
A charge control system for electric vehicles incorporating a three-level bidirectional DC-AC module, filtering module, and control module that reduces common-mode voltage, leakage current, and harmonic waves, allowing for high-power charging without a dedicated charging pile, and enabling charging with different grid systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a charging station is used to charge the power battery quickly, then the charging speed is improved, but the cost increases and the work area required increases
Solution Approach 1:
The in-vehicle charger is designed to accommodate both single-phase and three-phase grid connection modes through a unified circuit architecture. The charger can automatically adapt to different grid types without requiring separate charging stations, enabling multi-functional operation within the vehicle itself. This eliminates the need for external charging infrastructure while maintaining high charging capability.
2Power
If the in-vehicle charger is designed for high charging power, then the charging capability is improved, but the available space in the electric vehicle is exceeded
Solution Approach 1:
The charger integrates the three-phase rectification circuit, DC-DC conversion circuit, and control circuits into a single compact in-vehicle charging device. By merging multiple functions into one integrated unit, the system achieves high charging power capability while minimizing the space occupied in the vehicle. The unified design eliminates the need for separate components and reduces overall volume.
3Device complexity
If a dedicated charging pile is required for charging, then the charging system is simplified, but the hardware cost increases and the usability for different grid systems decreases
Solution Approach 1:
The in-vehicle charger is designed with universal compatibility to accept both single-phase and three-phase AC inputs. The circuit architecture includes switching elements and control logic that automatically adapt to the connected grid type, eliminating the need for dedicated charging piles for different grid configurations. This universal design reduces hardware costs while expanding usability across different electrical systems.
4Device complexity
If the charging system accommodates only star-type connection mode, then the circuit design is simplified, but the adaptability to different grid systems decreases
Solution Approach 1:
The charging system employs dynamic switching capability to adapt between star-type and delta-type connection modes. The circuit includes controllable switching elements that can reconfigure the connection topology based on the detected grid type. This dynamic adaptability allows the system to maintain simplified base circuit design while achieving versatility across different grid connection modes through controlled reconfiguration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution shortens charging time, reduces costs, and improves the universality and efficiency of electric vehicle charging by eliminating the need for a DC-DC voltage converter and accommodating various grid systems, while enhancing driving efficiency and convenience.
Implementation Method 1
a three-level bidirectional DC-AC module having a first DC terminal connected with a first terminal of a power battery of the electric vehicle and a second DC terminal connected with a second terminal of the power battery
Implementation Method 2
a filtering module connected between the AC terminal of the three-level bidirectional DC-AC module and the charge-discharge control module
Data Source
AI summary
A charge control system for an electric vehicle and an electric vehicle are provided. The charge control system includes: a charge-discharge socket (20); a three-level bidirectional DC-AC module (30); a charge-discharge control module (50); a filtering module (70); and a control module (60) connected with a third terminal of the charge-discharge control module (50) and configured to control the charge-discharge control module (50) to turn on, to sample an output voltage of an external grid by using a connection midpoint of filtering capacitors in the filtering module (70) as a reference point, and to control the three-level bidirectional DC-AC module (30) according to the output voltage of the external grid so as to control the external grid to charge the power battery (10), when the external grid is in an angle connection mode and the electric vehicle is a charge-discharge mode.