Bidirectional On-Board Charger Circuit for High-Power EV Inversion
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Solution Overview
Problem
Conventional on-board chargers for electric vehicles face issues with complex circuits, high component count, high costs, and limited inverter output power, particularly in implementing both high-power charging and inverter functions efficiently.
Innovation Solution
A bidirectional energy transmission apparatus with a controller and circuit that can switch between rectification and inversion states to convert between three-phase or single-phase alternating current and direct current, using a flexible configuration to support both high-power charging and inverter functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If three independent converters are used to implement high-power charging and inverter functions, then charging power and inverter functionality are improved, but circuit complexity and component count increase significantly
Solution Approach 1:
The patent merges the functions of multiple independent converters into a single integrated bidirectional energy transmission circuit. This circuit can operate in different working states (rectification state and inversion state) to simultaneously provide high-power charging and inverter functions, thereby reducing circuit complexity and component count while maintaining the required power output and functionality.
Solution Approach 2:
The bidirectional energy transmission circuit is designed with multi-functionality, capable of operating in rectification working state for charging and inversion working state for power output. This universal design allows a single circuit to replace multiple specialized converters, reducing overall system complexity while preserving both high-power charging and inverter capabilities.
2Power
If three independent converters are used to implement high-power charging and inverter functions, then charging power and inverter functionality are improved, but system cost increases
Solution Approach 1:
By combining multiple converter functions into a single bidirectional energy transmission circuit, the patent reduces the total number of power components required. This consolidation directly lowers manufacturing costs while maintaining the capability to deliver high-power charging and inverter functions through intelligent control of the integrated circuit.
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 solution enables efficient and flexible conversion between AC and DC, reducing complexity and costs while enhancing inverter output power and functionality.
Implementation Method 1
The controller is configured to control the bidirectional energy transmission circuit to be in a rectification working state, so as to convert, into a first direct current voltage, a three-phase or single-phase alternating current voltage
Implementation Method 2
the controller is configured to control the bidirectional energy transmission circuit to be in an inversion working state, so as to convert, into a three-phase or single-phase alternating current voltage, a first direct current voltage
Data Source
AI summary
Example bidirectional energy transmission apparatus and methods are described. An example of a bidirectional energy transmission apparatus includes a controller and a bidirectional energy transmission circuit. A control terminal of the controller is connected to a controlled terminal of the bidirectional energy transmission circuit. In the example, the controller is configured to control the bidirectional energy transmission circuit to be in a rectification working state, so as to convert, into a first direct current voltage, a three-phase or single-phase alternating current voltage that is input from a first port of the bidirectional energy transmission circuit, and output the first direct current voltage from a second port of the bidirectional energy transmission circuit. The controller is configured to control the bidirectional energy transmission circuit to be in an inversion working state, so as to convert, into a three-phase or single-phase alternating current voltage.