Multi-Phase Power Converter Phase Synchronization
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Solution Overview
Problem
Synchronizing multiple phases in variable frequency switching power supplies is challenging, especially in maintaining desired phase angle differences, which affects power factor correction and efficiency, particularly due to the complexity and cost of Phase Locked Loop (PLL) systems and the difficulty in maintaining phase lock over wide frequency variations.
Innovation Solution
A system and method that uses phase angle difference detectors to control waveform generators, allowing for synchronization of periodic waveforms in multiple phases to a desired phase angle difference, utilizing feedback signals and zero crossing points to adjust cycle lengths and phase timing, thereby reducing switching losses and improving power factor correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Phase Locked Loop (PLL) systems are used to synchronize multiple phases, then phase angle difference control is achieved, but circuit complexity and cost increase
Solution Approach 1:
The patent extracts the essential synchronization function from complex PLL systems by using simple phase angle difference detectors that directly measure and control phase relationships without requiring full PLL infrastructure. This removes unnecessary complexity while retaining the core phase synchronization capability.
Solution Approach 2:
The patent replaces expensive, complex PLL circuits with simpler, more economical phase angle difference detectors and waveform generators. These simpler components achieve the same synchronization function at lower cost and reduced circuit complexity.
2Measurement precision
If Phase Locked Loop (PLL) systems are used to synchronize multiple phases, then phase angle difference control is achieved, but implementation cost increases
Solution Approach 1:
The patent substitutes costly PLL components with inexpensive phase angle difference detectors and standard waveform generators, significantly reducing implementation cost while maintaining synchronization precision. The solution uses off-the-shelf components rather than specialized expensive hardware.
3Productivity
If variable frequency switching is used to obtain desired power supply output characteristics, then power conversion efficiency is improved, but maintaining phase lock over wide frequency variations becomes difficult
Solution Approach 1:
The patent implements dynamic phase angle difference control that automatically adapts to frequency variations. The waveform generators and detectors continuously adjust to maintain the desired phase relationship regardless of frequency changes, eliminating the phase lock maintenance problems of fixed-frequency PLL systems.
Solution Approach 2:
The patent uses feedback from phase angle difference detectors to continuously adjust waveform generation, ensuring phase synchronization is maintained across wide frequency variations. This closed-loop control provides reliability despite variable operating conditions.
4Object-generated harmful factors
If multiple interleaved phases are used, then input current ripple is reduced, but synchronization complexity increases
Solution Approach 1:
The patent combines multiple waveform generators into a synchronized multi-phase system controlled by a single synchronization mechanism. This unified approach reduces the overall synchronization complexity compared to managing each phase independently, while still achieving ripple reduction through interleaved operation.
Data Source
AI summary
A system and method for power conversion synchronizes multiple phases at a desired phase angle difference. The power conversion involves variable frequency switching, fixed on-time and provides power factor correction. A relative measure of a phase angle difference between two phases permits each phase to be controlled to obtain the desired phase angle difference. The power conversion involves transition mode switching to help reduce switching losses. A phase angle difference detector may be provided for each phase. The various phases may have different inherent frequencies that vary with switching frequency, and are synchronized to an average frequency. Current measures can be taken with a single component, such as a resistor. A maximum frequency control limits period width to avoid high frequency switching. An added switch on time improves input voltage crossover distortion. One or more phases can be deactivated in light load conditions.