Phase-Shifting Transformer Charging System for High Efficiency
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Solution Overview
Problem
Conventional charging systems for electric vehicles and data centers face high fabricating costs and reduced conversion efficiency due to complex circuitry and the need for power factor correction circuits to filter harmonic waves, which limits efficiency to around 89%-93%.
Innovation Solution
The proposed charging system employs a phase-shifting transformer with a three-phase primary winding assembly and multiple three-phase secondary winding assemblies, along with a converting unit comprising three-phase rectifying circuits and a DC-DC converting circuit, eliminating the need for power factor correction circuits by reducing harmonic waves and increasing the power factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional charging systems use isolated transformer and two-stage circuitry configuration, then power factor correction is achieved, but harmonic wave filtering requires complex circuitry and reduces conversion efficiency to 89%-93%
Solution Approach 1:
The patent extracts and eliminates the power factor correction circuit from the charging system. By using a phase-shifting transformer with specific winding configurations (delta-wye or wye-delta connections), the system naturally achieves power factor correction without requiring separate correction circuits, thereby simplifying the overall circuitry and reducing fabrication costs
Solution Approach 2:
The phase-shifting transformer performs multiple functions simultaneously: voltage transformation, harmonic wave filtering, and power factor correction. This multi-functionality eliminates the need for separate dedicated circuits for each function, reducing device complexity and fabrication costs while maintaining high conversion efficiency
2Ease of manufacture
If power factor correction circuits are used to filter harmonic waves, then power factor is improved, but conversion efficiency is reduced to 89%-93%
Solution Approach 1:
The patent converts the harmful harmonic waves directly into useful fundamental frequency power through the phase-shifting transformer's magnetic core design. The harmonic waves induce voltages in the transformer windings that are then rectified and converted to DC, transforming what would normally be wasted energy into useful charging power, thereby improving conversion efficiency to 96% or higher
3Power
If conventional charging systems use isolated transformer, then voltage transformation is achieved, but harmonic waves are not effectively filtered requiring additional power factor correction circuits
Solution Approach 1:
The patent merges the voltage transformation function and harmonic wave filtering function into a single phase-shifting transformer unit. The transformer's specific winding connections (delta-wye or wye-delta) create phase shifts that naturally cancel harmonic waves while simultaneously transforming voltage, eliminating the need for separate filtering circuits and reducing overall system complexity
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 configuration reduces fabricating costs and enhances conversion efficiency to 96% or higher, improving the overall performance of the charging system.
Implementation Method 1
the three-phase AC input voltage is received by a three-phase primary winding assembly, so that the three-phase AC input voltage is decreased, thereby outputting plural three-phase AC output voltages from respective three-phase secondary winding assemblies
Implementation Method 2
The plural three-phase AC output voltages are rectified by three-phase rectifying circuits
Implementation Method 3
the rectified voltage is converted into a DC charging voltage to charge the chargeable battery
Data Source
AI summary
A charging system is provided for charging a chargeable battery. The charging system includes a phase-shifting transformer and a converting unit. The phase-shifting transformer includes a three-phase primary winding assembly and plural three-phase secondary winding assemblies. After a three-phase AC input voltage is received by the three-phase primary winding assembly, the three-phase AC input voltage is decreased, so that plural three-phase AC output voltages are outputted from respective three-phase secondary winding assemblies. The converting unit is electrically connected with the phase-shifting transformer, and includes plural three-phase rectifying circuits and a DC-DC converting circuit. The plural three-phase AC output voltages are rectified by the three-phase rectifying circuits, and the rectified voltage is converted into a DC charging voltage to charge the chargeable battery.