Voltage Control Loop Transient Gain Adjustment
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Solution Overview
Problem
Power converters with non-linear loads experience inefficiencies and damage due to out-of-phase current and voltage, leading to power wastage and voltage overshoot or undershoot during transient conditions, primarily because of the low bandwidth of the voltage control loop.
Innovation Solution
A method and circuit for controlling a power converter that involves determining feedback signal ranges and adjusting the proportional and integral coefficients of the voltage control loop by decreasing the gain value of the amplifier circuit, specifically during transient conditions, to maintain a stable output voltage and improve power factor correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the bandwidth of the voltage control loop is increased to reduce output voltage overshoot or undershoot during transient conditions, then the response speed improves, but the power factor correction performance deteriorates
Solution Approach 1:
The patent implements dynamic bandwidth adjustment of the voltage control loop by detecting transient conditions and modifying the proportional and integral coefficients accordingly. During transient modes, the coefficients are adjusted to increase bandwidth for faster response, while during steady-state operation, they are adjusted to optimize power factor correction, thus making the control loop adaptable to different operating conditions
Solution Approach 2:
The patent changes the parameters (proportional and integral coefficients) of the voltage control loop based on operating conditions. By detecting transient conditions and adjusting these coefficients, the system optimizes the bandwidth dynamically - increasing it during transients to reduce overshoot/undershoot and maintaining appropriate values during steady-state for good power factor correction
2Reliability
If the proportional and integral coefficients of the voltage control loop are increased to improve transient response, then the stability during transient conditions improves, but the power factor correction accuracy deteriorates
Solution Approach 1:
The system dynamically adjusts the proportional and integral coefficients based on the detected operating mode. During transient conditions, the coefficients are increased to improve stability and reduce voltage overshoot/undershoot. During steady-state operation, the coefficients are optimized to maintain high power factor correction accuracy, thus adapting to different operational requirements
Solution Approach 2:
The patent modifies the proportional and integral coefficients of the voltage control loop according to the operating conditions. By detecting transient modes and adjusting these parameters accordingly, the system achieves both stable transient response and accurate power factor correction in steady-state, resolving the contradiction between stability and precision
Data Source
AI summary
A circuit for controlling a power converter includes a transient detector that generates a transient detection signal in response to a feedback signal indicating an output signal of the power converter, a gain selector that generates a gain selection signal in response to the transient detection signal, and an amplifier circuit that generates a comparison signal based on the value of the feedback signal, a value of a reference signal, and a gain value of the amplifier circuit, the gain value being adjusted in response to the gain selection signal. The transient detection signal indicates that a value of the feedback signal is in a first range and a specific condition of the feedback signal is detected.