Power Converter Diode State Synchronization
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Solution Overview
Problem
Conventional vehicle power converters using switching elements for rectification struggle to respond in real-time to load variations, leading to inefficiencies and output voltage fluctuations due to external noise and delayed response characteristics, requiring additional sensors and complex phase control checks.
Innovation Solution
A power converter design incorporating 2N switching elements per phase, 2N freewheeling diodes, a diode conducting state detector, ON and OFF PLL circuits, and a gate instruction generator to synchronize switching operations, eliminating the need for rotational position sensors and simplifying phase control by generating synchronized signals for precise ON and OFF timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If rotational position detecting means is used to control switching element timing, then synchronous rectification efficiency is improved, but the system cannot respond in real-time to load variations and requires additional sensors
Solution Approach 1:
The system uses the diode's own conducting state as the control signal source. The diode conducting state detector directly monitors when diodes turn on and off, and this information is fed back to control the switching elements, eliminating the need for external rotational position sensors while maintaining synchronous rectification efficiency and enabling real-time load response.
2Measurement precision
If rotational position sensors are attached to the shaft, then rotational position detection accuracy is improved, but external noise interferes with position signals and causes chattering
Solution Approach 1:
The invention extracts the control signal from the diode conducting state directly, removing the rotational position sensor from the system. This eliminates the source of noise interference while maintaining the ability to achieve synchronous rectification through direct monitoring of diode operation states.
3Manufacturing precision
If complex phase control checks are performed for six phases, then switching element timing accuracy is improved, but the control process burden increases significantly
Solution Approach 1:
The invention merges the control logic for all six phases into a unified system based on diode conducting state detection. By using the actual diode operation states as the control basis, the system simplifies the control process while maintaining timing accuracy across all phases, eliminating the need for separate complex checks for each phase.
Data Source
AI summary
A synchronization detection PLL section generates an ON synchronized signal formed as a result of synchronization control based on a diode ON synthesized signal. The synchronization detection PLL section also generates an OFF synchronized signal formed as a result of synchronization control based on a diode OFF synthesized signal. A stator gate instruction generator PWM section generates a gate instruction signal for controlling the switching of a switching element on the basis of the ON synchronized signal and the OFF synchronized signal.