Resonant Converter Phase Control for Faster Multi-Output Regulation

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Solution Overview

Problem

Resonant converters face poor dynamic response due to limited bandwidth, impacting system performance in applications like multi-output converters, where frequency control is essential for adjusting output signals.

Innovation Solution

The implementation of a control circuit that includes a charge feedback circuit, switching control signal generating circuit, and driving circuit, which adjusts the conduction time of transistors in the switch circuit by generating feedback signals and control signals based on error information, effectively simplifying the control loop to a first-order system, enhancing bandwidth and dynamic responsiveness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If frequency control is used to adjust output signals in resonant converters, then output regulation is achieved, but dynamic response deteriorates due to limited bandwidth

Engineering Contradiction:

Improveoutput regulationVSAvoiddynamic response

Core Design Contradiction:

Measurement precisionVSSpeed

Solution Approach 1:

The patent changes the control parameter from frequency to phase. By controlling the phase difference between the full-bridge legs rather than adjusting frequency, the system achieves both precise output regulation and fast dynamic response, resolving the contradiction between these two requirements

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the traditional frequency-based control mechanism with a phase-based control mechanism. This substitution allows the resonant converter to maintain its resonant operation while achieving superior dynamic response through phase modulation of the switching signals

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If traditional control loops are used in resonant converters, then comprehensive control is achieved, but system complexity increases and bandwidth is limited

Engineering Contradiction:

Improvecontrol completenessVSAvoidcontrol loop complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates unnecessary control elements from the traditional control loop. By using direct phase control of the full-bridge legs based on output feedback, it removes intermediate control stages, simplifying the system while maintaining effective control of the resonant converter

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The control circuit achieves multiple functions (output regulation, bandwidth enhancement, dynamic response improvement) through a unified phase control mechanism, reducing the need for separate control loops and components

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12191773B2Control circuit for a resonant converter having at least two output signals

Publication Date: 2025.01.07 SILERGY SEMICON TECH (HANGZHOU) CO LTD

AI summary

A control circuit for a resonant converter having at least two output signals, the control circuit including: a charge feedback circuit configured to generate a charge feedback signal representing a resonant current of a resonant circuit in the resonant converter; and a switching control signal generating circuit configured to generate switching control signals according to the charge feedback signal and feedback signals representing error information of each of the at least two output signals.