Power Converter Control Circuit for Parallel Current Sharing
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Solution Overview
Problem
Existing switching resonant tank converter circuits lack a solution for current sharing between multiple sets of converters, which hinders optimal efficiency and output voltage/impedance adjustment in parallel applications.
Innovation Solution
A control circuit and method that uses zero current detection circuits to individually control on-times of rectifier switches, ensuring zero voltage turn-on and zero current turn-off, and adjusts switching signals to balance output voltage and current sharing across parallel paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If automatic adjustment of on-time control is implemented to optimize efficiency, then converter efficiency is improved, but current sharing between multiple converters in parallel applications cannot be achieved
Solution Approach 1:
The patent segments the control of rectifier switches by introducing separate zero current detection circuits for each switch (first zero current detection circuit for first rectifier switch, second zero current detection circuit for second rectifier switch). This segmentation allows individual on-time control for each switch while maintaining overall system efficiency, resolving the contradiction between efficiency optimization and current sharing capability.
Solution Approach 2:
The patent implements feedback mechanisms through zero current detection circuits that monitor the current status of each rectifier switch and provide feedback signals to control circuits. This feedback enables dynamic adjustment of on-times for individual switches, achieving both efficiency optimization through automatic adjustment and current sharing through coordinated control of multiple converters in parallel.
2Loss of energy
If individual on-time control of rectifier switches is implemented, then zero voltage turn-on and zero current turn-off are achieved, but control circuit complexity increases
Solution Approach 1:
The patent employs self-service principles by using zero current detection circuits that automatically detect when resonant current reaches zero and generate turn-off signals without requiring complex external control. The control circuits self-adjust on-times based on feedback from zero current detection, achieving zero voltage turn-on and zero current turn-off while minimizing control circuit complexity through autonomous operation.
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 approach optimizes the overall efficiency of the power converter by balancing on-times of rectifier switches, overcoming component errors and achieving adjustable output voltage and current sharing for parallel outputs.
Implementation Method 1
configuring a first zero current detection circuit to detect the first resonant current on the first rectifier switch, and output, in response to detecting that the first resonant current reaches zero amp, a first zero current signal
Implementation Method 2
a first resonant current along a first resonant path and a second resonant current along a second resonant path through the plurality of resonant tanks
Data Source
AI summary
A control circuit and a control method for a power converter are provided. The power converter includes a plurality of resonant tanks and a plurality of switches disposed between an input terminal and an output terminal. The switches correspond to a first mode and a second mode, respectively, and the control circuit includes a first switch control circuit, a first zero current detection circuit, a second zero current detection circuit, a first switch off detector, a modulation time calculation module, a second switch control circuit, a third zero current detection circuit, a fourth zero current detection circuit, and a second switch off detector. The control circuit uses a plurality of zero current detection circuits to perform time modulations on a plurality of rectifier switches in the switches.