Multi Phase Shift Power Converter Control
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Solution Overview
Problem
Traditional power converter control techniques using a single control parameter, such as phase shift, are inadequate for optimal control over a wide range of operating conditions, limiting efficiency and flexibility in power conversion.
Innovation Solution
Implementing multiple phase shifts across bridges in power converters, specifically using a multi phase shift control technique that allows for variable effective frequency control and asymmetric duty cycles, enabling optimal operation across a wide output voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single control parameter (phase shift) is used in traditional power converter control, then the control design is simple, but optimal control over a wide range of operating conditions cannot be achieved
Solution Approach 1:
The patent segments the control approach by introducing multiple independent phase shift parameters (first phase shift between full-bridge switches, second phase shift between half-bridge switches, third phase shift between full-bridge and half-bridge). This segmentation allows each phase shift to independently control different aspects of power conversion, enabling optimal control across a wide operating range while maintaining manageable control design through modular parameter adjustment
2Ease of operation
If traditional single phase shift control is used, then the control implementation is straightforward, but efficiency and flexibility in power conversion are limited
Solution Approach 1:
The patent implements dynamic control by allowing independent adjustment of three phase shift parameters that can be varied in real-time based on operating conditions. The controller dynamically optimizes the first phase shift (a1), second phase shift (a2), and third phase shift (a3) to achieve zero voltage switching (ZVS) and zero current switching (ZCS) across the full power range, thereby maintaining high efficiency and flexibility without complicating the implementation approach
3Adaptability or versatility
If wide output voltage range control is achieved through traditional methods, then operating flexibility is limited, but control parameter complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific functions to each phase shift parameter: the first phase shift (a1) controls the full-bridge side voltage waveform, the second phase shift (a2) controls the half-bridge side voltage waveform, and the third phase shift (a3) controls the overall power transfer. This localized functional assignment allows independent optimization of each parameter for different voltage range requirements, achieving wide output voltage control while keeping the control structure organized and manageable
Data Source
AI summary
A method and apparatus for multi phase shift control of a power converter. In one embodiment, the method comprises controlling a phase shift between a left leg and a right leg of a first bridge of the power converter during operation of the power converter; and controlling a phase shift between the first bridge and a second bridge of the power converter during the operation of the power converter, wherein the phase shift between the left and the right legs and the phase shift between the first and the second bridges are controlled based on an input voltage of the power converter and a required output voltage of the power converter.