On-Vehicle Power Supply System Using Three-Level Bidirectional DC-AC Module
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Solution Overview
Problem
Electric vehicles with large capacity power batteries require long charging times and do not effectively utilize idle power, limiting their endurance and functionality.
Innovation Solution
An on-vehicle power supply system incorporating a three-level bidirectional DC-AC module that converts DC voltage from the power battery to AC voltage, allowing the electric vehicle to charge external loads and recharge itself without additional DC-DC converters, enhancing charging efficiency and usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If power batteries with large capacity are used to improve endurance ability, then the endurance ability of electric vehicles is improved, but the charging time becomes long
Solution Approach 1:
The electric vehicle power supply system enables the vehicle to charge external loads and recover energy autonomously. The control module automatically manages the bidirectional DC-AC conversion to allow the vehicle to serve itself by charging external devices and recovering energy back into the battery, reducing dependency on external charging infrastructure and minimizing charging time loss
Solution Approach 2:
The three-level bidirectional DC-AC module dynamically changes voltage parameters to enable high-power charging. By adjusting the DC-AC conversion parameters and operating modes, the system achieves rapid charging capability that significantly reduces charging time while maintaining the large battery capacity needed for endurance
2Device complexity
If traditional power supply systems are used, then the structure is simple, but the idle power in the power battery cannot be effectively used
Solution Approach 1:
The three-level bidirectional DC-AC module serves multiple functions: it enables the power battery to charge external loads, allows AC charging of the vehicle, and facilitates energy recovery. This multi-functional design allows the same hardware to handle various power flow directions and modes, effectively utilizing idle power without proportionally increasing system complexity
Solution Approach 2:
The system enables the electric vehicle to autonomously charge external loads and recover energy. The control module automatically manages the bidirectional power flow, allowing the vehicle to serve itself by converting DC battery power to AC for external devices and recovering energy from AC charging, thereby effectively utilizing idle battery power
3Power
If additional DC-DC voltage increasing and decreasing modules are added to achieve high power charging, then the charging power is increased, but the device complexity increases
Solution Approach 1:
The three-level bidirectional DC-AC module is designed to perform both DC-AC conversion and DC-DC voltage transformation functions. By integrating multiple power conversion capabilities into a single module, the system achieves high-power charging without adding separate DC-DC converters, thereby maintaining simpler overall system architecture while delivering the required charging power
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
The system enables high-power charging of the battery, reduces charging time, and allows the electric vehicle to supply power to external loads, such as household appliances, improving its functionality and convenience.
Implementation Method 1
a three-level bidirectional DC-AC module having a first DC terminal connected with a first terminal of the power battery and a second DC terminal connected with a second terminal of the power battery... configured to control the three-level bidirectional DC-AC module to convert a DC voltage of the power battery into an AC voltage with a predetermined value
Data Source
AI summary
An on-vehicle power supply system and an electric vehicle are provided. The on-vehicle power supply system includes: a power battery (10); a charge-discharge socket (20) connected with an external load (1001); a three-level bidirectional DC-AC module (30) having a first DC terminal connected with a first terminal of the power battery (10) and a second DC terminal connected with a second terminal of the power battery (10); a charge-discharge control module (50) having a first terminal connected with an AC terminal of the three-level bidirectional DC-AC module (30) and a second terminal connected with the charge-discharge socket (20); and a control module (60) connected with the charge-discharge control module (50) and the three-level bidirectional DC-AC module (30), and configured to control the three-level bidirectional DC-AC module (30) to convert a DC voltage of the power battery (10) into an AC voltage.