Power Factor Control for Resonant Converter Load Responsiveness
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Solution Overview
Problem
Feedback control methods for resonant power converters, including frequency control and current feedback, fail to ensure satisfactory load responsiveness.
Innovation Solution
A control method and system that utilize power factor-based control, where a controller adjusts the voltage generation circuit to achieve a desired power factor by deriving and controlling the active and apparent power within the resonant circuit, improving load responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If frequency control or resonant current feedback control is used, then the resonant power converter can operate with soft switching and high efficiency, but the load responsiveness is insufficient
Solution Approach 1:
The patent changes the control parameter from frequency or resonant current to power factor. By controlling the power factor of the resonant current, the system achieves both high efficiency (through maintained soft switching) and improved load responsiveness. The power factor control dynamically adjusts the phase relationship between voltage and current, enabling faster response to load changes while preserving the beneficial soft switching characteristics.
2Reliability
If feedback control based on frequency control is implemented, then the output voltage can be regulated, but the load responsiveness remains unsatisfactory
Solution Approach 1:
The patent implements feedback control based on power factor rather than frequency. The power factor of the resonant current is measured and fed back to the control system, which then adjusts the switching timing to maintain the desired power factor. This feedback mechanism provides both stable output voltage regulation and fast load responsiveness, as power factor directly reflects the loading condition and can be rapidly adjusted through timing control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The power factor-based control method significantly enhances load responsiveness and stability, outperforming conventional frequency control methods in dynamic load conditions.
Implementation Method 1
A resonant power converter has a primary circuit using, for example, an LC resonant circuit such as an LLC converter and a secondary circuit electromagnetically coupled to the primary circuit
Implementation Method 2
A resonant power converter has a primary circuit using, for example, an LC resonant circuit such as an LLC converter and a secondary circuit electromagnetically coupled to the primary circuit
Data Source
AI summary
A control method, a controller, and a control system including a converter and the controller are provided to improve load responsiveness of control by the converter. The converter has a primary circuit that includes a voltage generation circuit for generating a square wave and a resonant circuit for converting a waveform of the generated square wave, and a secondary circuit that is electromagnetically coupled to the primary circuit and that generates an induced electromotive force. The controller controls the voltage generation circuit by a control target power factor. To implement power factor-based control, the controller controls the voltage generation circuit, based on a derived power factor derived from an active power and an apparent power relevant to the resonant circuit in the primary circuit or a derived power factor derived from a phase of the primary circuit.