Resonant Converter Phase Shift Module for Monotonic DC Gain Control
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Solution Overview
Problem
Resonant converters face issues with non-monotonic DC voltage gain and inability to achieve zero gain, leading to inefficiencies and potential component damage due to phase delays between primary and secondary drivers, especially when using synchronous rectifiers.
Innovation Solution
A phase shift module is introduced to regulate the phase difference between primary and secondary drivers, generating control signals to compensate for phase shifts and maintain monotonic DC gain by adjusting the timing of driver signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If synchronous rectifiers are turned on by a secondary driver earlier than the primary driver to reduce power loss, then power efficiency is improved, but phase delay between drivers increases causing non-monotonic DC gain
Solution Approach 1:
The patent changes the timing parameter of the secondary driver relative to the primary driver by introducing a controllable delay. This delay parameter is adjusted to optimize the balance between reducing body diode conduction loss and maintaining monotonic DC gain characteristics. The delay circuit modifies the phase relationship between drivers to achieve stable gain response.
2Adaptability or versatility
If the resonant converter frequency is varied to control DC gain, then gain adjustment is achieved, but the non-monotonic gain response causes multiple frequencies to correspond to the same gain level reducing control effectiveness
Solution Approach 1:
The patent introduces a delay parameter as an additional control variable that modifies the gain-frequency relationship. By adjusting the delay between primary and secondary drivers, the converter achieves a monotonic gain response that eliminates the multi-valued frequency-gain mapping problem, improving control stability and predictability.
3Loss of energy
If the secondary driver is advanced to reduce body diode conduction time, then conduction loss is reduced, but component stress increases due to non-monotonic gain and potential for uncontrolled voltage levels
Solution Approach 1:
The patent carefully adjusts the timing parameter of the secondary driver to achieve optimal reduction in body diode conduction loss while maintaining safe operating conditions. The delay circuit provides precise control over the advance angle, preventing excessive current or voltage stress on components by limiting the maximum advance time.
Data Source
AI summary
A method for controlling a direct current gain of a resonant converter to increase power efficiency within a circuit. A phase shift module is configured to the resonant converter for generating a first control signal to control a primary driver of the resonant converter and a secondary control signal to control a secondary driver of the resonant converter. The first control signal and the secondary control signal have a phase shift for controlling a DC gain of the resonant converter.