Three Half-Bridge Inverter for Integrated Wireless Charging

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Solution Overview

Problem

Conventional power conversion circuits require external rectifiers and DC-DC converters, occupying space and affecting heat dissipation, hindering device miniaturization.

Innovation Solution

A power conversion circuit design incorporating an inverter with three half-bridge circuits and a processor to control switches, enabling internal rectification and power conversion without external components, and sharing components between charging and discharging modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If external rectifier and DC-DC converter are used for power conversion, then power conversion function is achieved, but device space is occupied and heat dissipation is affected

Engineering Contradiction:

Improvepower conversion functionVSAvoiddevice space

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent merges the rectifier and DC-DC converter functions into the inverter by using the same half-bridge circuits for both rectification and inversion operations. The first and second half-bridge circuits perform rectification during charging mode, while all three half-bridge circuits perform inversion during discharging mode, eliminating the need for separate external rectifier and DC-DC converter components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The inverter circuits are designed to perform multiple functions: they serve as rectifiers during wireless charging mode and as inverters during battery discharge mode. The half-bridge circuits can be dynamically configured through switch control to achieve different power conversion functions, making the system multi-functional and reducing overall component count.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If external rectifier and DC-DC converter are used, then power conversion is achieved, but heat dissipation effect is affected

Engineering Contradiction:

Improvepower conversion functionVSAvoidheat dissipation

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

By combining the rectifier and DC-DC converter functions into the existing inverter circuits, the patent reduces the total number of power conversion components. This consolidation decreases the cumulative heat generation from multiple separate components and simplifies the thermal management system, allowing for better heat dissipation with fewer heat sources.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If conventional power conversion circuit is used, then power conversion function is achieved, but device miniaturization is hindered

Engineering Contradiction:

Improvepower conversion functionVSAvoidcomponent count

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges multiple power conversion functions (rectification and inversion) into a single integrated circuit structure using three half-bridge circuits. This consolidation reduces the component count and simplifies the overall circuit architecture, enabling device miniaturization while maintaining full power conversion functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Inventive Principle:

Principle #6Universality (Multi-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

Achieves miniaturization by eliminating the need for external rectifiers and DC-DC converters, improving heat dissipation and reducing component count.

Implementation Method 1

The processor is configured to generate a plurality of control signals at a first stage to respectively control the switches so that the battery supplies power to the motor

Methodology Applied

Scientific EffectElectrical power conversion:

Implementation Method 2

The processor is configured to alternately conduct the switches of the other two of the first half-bridge circuit, the second half-bridge circuit and the third half-bridge circuit so as to adjust a power supply of the wireless charging transmitter device to charge the battery

Methodology Applied

Scientific EffectPower rectification and conversion:

Data Source

PatentUS20260045815A1Power conversion circuit and inverter

Publication Date: 2026.02.12 DELTA ELECTRONICS INC(CN)

AI summary

A power conversion circuit is coupled to a motor and a wireless charging transmitter device. Power conversion circuit includes an inverter and a processor. Inverter includes three half-bridge circuits. Three half-bridge circuits are respectively coupled to a battery, motor and wireless charging transmitter device. Each of three half-bridge circuits includes two switches. Processor is coupled to switches of three half-bridge circuits and generates a plurality of control signals at a first stage to respectively control switches according to a first level of each of control signals, so that battery supplies power to motor. Processor adjusts first level of each of control signals to a second level during a second stage to turn off one of three half-bridge and to turn on switches of the other two of three half-bridge alternately so as to adjust a power supply of wireless charging transmitter device to charge battery to a target power.