Multi-Phase Converter Frequency Control for Stable Phase Shift
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Solution Overview
Problem
Maintaining a stable phase shift between multi-phase frequency modulation control signals in converters is challenging due to frequent adjustments in frequency, which complicates optimal output ripple current cancellation.
Innovation Solution
A method and apparatus that adjust the period of each frequency modulation control signal based on the phase shift relative to a target phase shift, using a controller to determine and update the period by a predetermined amplitude when the phase shift exceeds a threshold, ensuring the phase shift remains stable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the frequency of control signals is continuously adjusted to regulate output based on input voltage/current changes and load conditions, then the converter can adapt to varying operating conditions and maintain expected output levels, but the phase shift between multi-phase control signals becomes unstable and difficult to maintain
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors the actual phase shift between control signals and compares it with a target phase shift value. Based on this comparison, the controller dynamically adjusts the period of control signals to maintain the desired phase relationship, thereby resolving the contradiction between frequency adaptability and phase stability
Solution Approach 2:
The patent makes the control signal period dynamic by allowing it to vary based on the phase shift error. Instead of using fixed periodic signals, the system continuously adapts the period of control signals in response to phase deviations, enabling the system to maintain stable phase relationships while adapting to changing operating conditions
2Power
If separate frequency modulated control signals are used to control individual converters operating in parallel, then each converter can be independently controlled to achieve high power and high efficiency, but maintaining a stable phase shift between control signals becomes difficult when frequencies are constantly adjusted
Solution Approach 1:
The patent creates a universal control approach that works for multi-phase converters operating in parallel by implementing a common phase synchronization mechanism. The controller uses the same feedback-based period adjustment method for all phase control signals, ensuring consistent phase relationships across multiple converters while maintaining independent control capability for high power operation
Data Source
AI summary
A method of controlling a converter apparatus operable based on a first frequency modulation control signal and at least one second frequency modulation control signal, includes determining updated periods of the first frequency modulation control signal and the at least one second frequency modulation control signal based on the output, for each second frequency modulation control signal, at a beginning of each period of the first frequency modulation control signal, determining a phase shift of the second frequency modulation control signal relative to the first frequency modulation control signal, when a difference between the phase shift and a target phase shift exceeds a predetermined threshold, determining the period of the second frequency modulation control signal as the updated period increased or decreased by a predetermined amplitude, otherwise determining the period of the second frequency modulation control signal as the updated period.