Single-Stage AC-DC Converter Topology for Lower Power Loss
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Solution Overview
Problem
Existing AC-DC converter circuits for wireless charging have high manufacturing costs and volumes due to multiple stages, including bridge diodes and boost converters, which result in significant power losses and complexity, limiting market competitiveness and efficiency.
Innovation Solution
A single-stage AC-DC converter circuit system is designed, removing the bridge diode and boost converter, utilizing a primary transformer with bidirectional FETs and a secondary transformer to directly convert AC to DC power, minimizing reactive power and power losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-stage converter circuit with bridge diode and boost converter is used, then the converter can perform power factor correction and AC to DC conversion, but the manufacturing cost and circuit volume increase
Solution Approach 1:
The patent merges the power factor correction function and AC to DC conversion function into a single integrated circuit stage. The converter circuit directly converts AC input to DC output while performing power factor correction, eliminating the need for separate bridge diode rectifier and boost converter stages. This integration maintains all necessary functions while reducing component count and circuit complexity.
2Reliability
If a multi-stage converter circuit is used, then the conversion process can be completed, but the manufacturing cost and circuit volume increase
Solution Approach 1:
The patent combines multiple conversion stages into a single integrated circuit. The converter circuit performs both power factor correction and AC to DC conversion in one stage, eliminating the need for separate bridge diode rectifier and boost converter sections. This integration significantly reduces the overall circuit volume while maintaining full conversion capability.
3Reliability
If a multi-stage converter circuit with bridge diode and boost converter is used, then the conversion process can be completed, but the power loss increases
Solution Approach 1:
The patent integrates power factor correction and AC to DC conversion into a single circuit stage, eliminating the need for separate bridge diode and boost converter sections. This integration reduces the number of power conversion steps and associated energy losses, improving overall conversion efficiency while maintaining reliable power conversion capability.
4Reliability
If a multi-stage converter circuit is used, then the conversion process can be completed, but the number of power conversion stages increases complexity
Solution Approach 1:
The patent merges multiple power conversion stages into a single integrated circuit. The converter circuit simultaneously performs power factor correction and AC to DC conversion in one stage, reducing the number of discrete power conversion sections from multiple stages to a single unified stage. This simplifies the overall circuit architecture while maintaining complete power conversion functionality.
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 manufacturing costs and volumes, enhances efficiency by eliminating unnecessary power conversion stages, and improves market competitiveness with a high-efficiency, low-cost converter system.
Implementation Method 1
a primary transformer including a plurality of field-effect transistors (FETs)
Implementation Method 2
a secondary transformer configured to allow the DC power to be output from a grid that is allowed to have a positive value by the primary transformer
Data Source
AI summary
An alternating current (AC)-to-direct current (DC) (AC-DC) converter circuit system, and a method of designing the AC-DC converter circuit system. The AC-DC converter circuit system includes an AC-DC converter configured to receive an AC grid input from an electric power source and convert the AC grid input into DC battery power. The AC-DC converter may include a primary transformer including a plurality of field-effect transistors (FETs), and a secondary transformer configured to allow the DC battery power to be output from a grid that is allowed to have a positive value by the primary transformer.