Bidirectional Power Conversion Circuit for EV Charging and AC Supply
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Solution Overview
Problem
Current power conversion devices for motor vehicles lack the ability to efficiently manage both charging and power supply functions, particularly in DC-charging systems where AC/DC conversion is not required, leading to a need for a device that can convert DC power from the vehicle to AC power for external use while also charging the vehicle.
Innovation Solution
A power conversion device with a bidirectional power conversion circuit, switching circuit, and control circuit that can selectively perform charging and power supply operations by connecting the power conversion circuit to either the charging port or the power supply port, using external power sources for operation voltage, eliminating the need for internal components and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power conversion device includes both charging and power supply functions, then the device can serve multiple purposes (charging the vehicle and supplying power to external loads), but the device complexity increases due to the need for switching circuits and multiple ports
Solution Approach 1:
The power conversion device is designed with bidirectional power conversion capability, allowing the same power conversion circuit to perform both AC-DC conversion for charging and DC-AC conversion for power supply. The switching circuit enables the system to switch between charging mode and power supply mode, making a single device serve multiple functions without requiring separate dedicated circuits for each function.
2Ease of operation
If the power conversion device uses an internal power source for operation voltage, then the device can operate independently, but the device complexity and cost increase due to additional internal components
Solution Approach 1:
The device obtains its operation voltage from external sources (either the external power supply during charging mode or the vehicle's power source during power supply mode) rather than carrying an internal battery or power source. This self-service approach allows the device to operate independently in each mode while avoiding the complexity and cost of internal power storage components.
3Productivity
If the charging port and power supply port are electrically connected, then the device can transfer power between them, but harmful factors arise due to potential interference and safety issues
Solution Approach 1:
The switching circuit acts as an intermediary between the power conversion circuit and the external ports. It controls the electrical connection state, ensuring that the charging port and power supply port are not simultaneously connected to the power conversion circuit. This mediation prevents direct electrical interference between the two ports while maintaining efficient power transfer capability when needed.
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
Enables efficient management of charging and power supply operations, reducing component costs and complexity, and allowing the device to function as both a charger and a portable power source, preventing mutual interference between external power supplies and loads.
Implementation Method 1
The power conversion circuit is a bidirectional power conversion circuit and is configured to execute power conversion between the DC connector and the charging port and between the DC connector and the power supply port
Data Source
AI summary
A power conversion device configured to execute power conversion between a vehicle and an external power supply or an external load includes a DC connector, a charging port, a power supply port, a bidirectional power conversion circuit, a switching circuit configured to execute switching to choose whether to electrically connect the power conversion circuit and the charging port or electrically connect the power conversion circuit and the power supply port, and a control circuit configured to control the power conversion circuit and the switching circuit to selectively execute a charging operation or a power supply operation.