Rectifier Circuit Topology for Reverse Recovery Loss Reduction
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Solution Overview
Problem
Conventional rectifier circuits experience significant switching loss due to reverse recovery current, which has not been adequately addressed by existing technologies.
Innovation Solution
A rectifier circuit comprising a high withstand voltage transistor, a low withstand voltage transistor, and a control transistor, where the transistors are configured to have overlapping conduction and non-conduction periods, reducing the reverse recovery current through synchronized operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional rectifier circuits are used, then the circuit structure is simple, but switching loss increases due to reverse recovery current
Solution Approach 1:
The rectifier circuit is segmented into multiple transistor stages: a first transistor connected to the rectified line, a second transistor connected between the first transistor and ground, and a third transistor connected between the first transistor and the output line. This segmentation allows each transistor to handle specific voltage and current ranges, reducing reverse recovery current effects in each stage while maintaining overall circuit functionality.
Solution Approach 2:
The second transistor acts as an intermediary element between the high-voltage first transistor and the low-voltage third transistor. This intermediate stage buffers the voltage transition, reducing the reverse recovery current that would otherwise occur during switching transitions between the first and third transistors.
2Loss of energy
If a single high withstand voltage transistor is used, then the circuit is simple, but switching loss occurs due to reverse recovery current
Solution Approach 1:
Different transistors are assigned different withstand voltage ratings matched to their specific circuit positions and requirements. The first transistor handles high voltage from the rectified line, the second transistor handles intermediate voltage levels, and the third transistor handles lower voltage near the output. This local optimization reduces reverse recovery current in each transistor by selecting appropriate voltage ratings for their specific operating conditions.
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
The proposed rectifier circuit effectively reduces the reverse recovery current, leading to lower losses compared to conventional technologies, as demonstrated by the reduced maximum negative current during reverse recovery.
Implementation Method 1
The high withstand voltage transistor has a control terminal thereof connected to a reference terminal of the low withstand voltage transistor via a capacitor
Data Source
AI summary
A rectifier circuit is used that includes a high withstand voltage transistor, a low withstand voltage transistor, and a control transistor. The high withstand voltage transistor has a reference terminal thereof connected to a high voltage terminal of the low withstand voltage transistor, and the high withstand voltage transistor has a control terminal thereof connected to a reference terminal of the low withstand voltage transistor via a capacitor. The control transistor has a high voltage terminal thereof connected to the control terminal of the high withstand voltage transistor, a reference terminal thereof connected to the reference terminal of the low withstand voltage transistor, and a control terminal thereof connected to the high voltage terminal of the low withstand voltage transistor.