Half-Bridge Circuit Transient Current Suppression
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Solution Overview
Problem
Existing half-bridge circuits face challenges in effectively reducing transient current, which leads to energy losses due to the reverse recovery current and charging current of parasitic capacitance in switching elements.
Innovation Solution
A half-bridge circuit configuration that includes a transformer with primary, secondary, and tertiary windings, and rectifying elements connected in parallel with switching elements, along with a transistor element connected to the primary winding, where specific current flows and voltage applications manage the rectified and transient currents to minimize losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a diode and transformer connected in parallel to a switching element are provided to reduce transient current, then transient current is reduced, but device complexity increases
Solution Approach 1:
The patent divides the transient current suppression function into multiple independent modules: a first suppression module with a first diode and first transformer for the first switching element, and a second suppression module with a second diode and second transformer for the second switching element. Each module operates independently to suppress transient current in its respective switching element, allowing the system to reduce energy loss while maintaining manageable circuit complexity through modular design.
2Loss of energy
If rectifying elements are connected in parallel with switching elements to reduce reverse recovery current, then reverse recovery current is reduced, but the circuit structure becomes more complex
Solution Approach 1:
The patent introduces diodes as intermediary elements connected in parallel with each switching element. These diodes act as mediators that provide an alternative current path during the reverse recovery phase, allowing the reverse recovery current to bypass the switching element and flow through the diode instead. This intermediary approach effectively reduces reverse recovery current loss while adding only a single passive component per switching element.
Solution Approach 2:
The patent employs simple diodes and transformers, which are relatively inexpensive and compact components, to suppress transient and reverse recovery currents. By using these cost-effective and space-efficient components rather than complex active circuitry, the patent achieves effective current suppression with minimal increase in device complexity and cost.
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 significantly reduces transient current, enhancing energy efficiency by managing current flows and voltage applications across the circuit, thereby minimizing energy losses.
Implementation Method 1
a transformer including a primary winding, a secondary winding, and a tertiary winding
Implementation Method 2
a first rectifying element connected in parallel with the first switching element with the secondary winding interposed between the first rectifying element and the first switch element
Data Source
AI summary
In a half-bridge circuit, in a case that a first transistor element is turned ON, a primary winding current flows from a power supply to a primary winding. Then, in a case that the first transistor element is turned OFF, (i) a first rectifying element current flows from a secondary winding to a first rectifying element, or (ii) a second rectifying element current flows from a tertiary winding to a second rectifying element.