Bidirectional Charging System Circuit Merging for Vehicle Torque Vectoring
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Solution Overview
Problem
The increasing complexity and cost of circuit structures in electric vehicles due to the need for various power conversion circuits for charging batteries, implementing vehicle-to-grid (V2G) or vehicle-to-load (V2L) technology, and torque vectoring, which requires a large number of electric components.
Innovation Solution
A bidirectional charging system that uses a minimal number of electric components, including a first bridge circuit, a transformer, and a controller to perform power conversion for charging batteries and providing power to a grid, load, or motor, with operation modes that selectively connect switching elements to either the motor or transformer windings, eliminating the need for a separate inverter for auxiliary driving motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If various power conversion circuits are provided individually for battery charging, V2G/V2L, and torque vectoring, then the required power conversion functions are achieved, but the circuit structure becomes complicated and costs increase
Solution Approach 1:
The patent merges the power conversion circuit for auxiliary motors with the DC-DC converter circuit by using a bridge circuit that can operate in multiple modes. The same bridge circuit is used for both battery-to-motor power conversion and DC-DC conversion, eliminating the need for separate power conversion circuits and reducing overall system complexity
Solution Approach 2:
The bridge circuit is designed with universal functionality to perform multiple power conversion tasks. By controlling the switching elements, the same circuit can convert battery power to motor power, perform DC-DC conversion for battery charging, and support V2G/V2L operations, making a single circuit serve multiple purposes
2Adaptability or versatility
If various power conversion circuits are provided individually for battery charging, V2G/V2L, and torque vectoring, then the required power conversion functions are achieved, but the costs for circuit implementation increase
Solution Approach 1:
The patent combines multiple power conversion functions into a single DC-DC converter circuit with a bridge circuit, reducing the total number of electric components required. This consolidation directly lowers manufacturing costs by eliminating redundant circuits while maintaining all necessary power conversion capabilities
Solution Approach 2:
The universal bridge circuit design allows a single circuit implementation to handle battery charging, V2G, V2L, and torque vectoring functions, reducing the bill of materials and manufacturing complexity compared to implementing separate dedicated circuits for each function
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 reduces the circuit size and cost by using the bridge circuit of the DC-DC converter to drive auxiliary driving motors for torque vectoring, suppressing the increase in circuit size and cost associated with adding a motor driving circuit.
Implementation Method 1
a transformer (30) including a plurality of primary-side windings (31) connected to a grid or load side and a plurality of secondary-side windings (32) insulated from the plurality of primary-side windings
Data Source
AI summary
An embodiment bidirectional charging system for a vehicle includes a first bridge circuit having a plurality of legs each including two first switching elements connected in series with each other between both ends of a battery, a transformer comprising a plurality of primary-side windings connected to a grid or load side and a plurality of secondary-side windings insulated from the plurality of primary-side windings, a motor including a plurality of input terminals configured to receive a plurality of phase voltages, respectively, a plurality of changeover switches configured to selectively connect connection nodes of the two first switching elements included in the plurality of legs to the plurality of secondary-side windings or to the plurality of input terminals, respectively, and a controller configured to control connection states of the plurality of changeover switches according to a pre-configured operation mode.