Power Filter LCR Peak Compensation for LC Resonance Gain Dips
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Solution Overview
Problem
The instability of the control loop in power filters due to the influence of LC resonance frequency makes loop compensation difficult, especially with the use of low-inductance inductors and polymer capacitors, which shift gain dips to higher frequencies and deepen them, complicating the compensation process.
Innovation Solution
A power filter design incorporating an overvoltage protection circuit with a peak compensation circuit, implemented as an LCR parallel resonance circuit, generates a gain peak at the LC resonance frequency to counteract the gain dip, using an equivalent inductance circuit and RC components to form an LCR parallel resonance circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an LC filter is used in the power filter, then filtering performance is improved, but stability of the control loop deteriorates due to gain dip at resonance frequency
Solution Approach 1:
The patent converts the harmful gain dip at LC resonance frequency into a beneficial feature by introducing a peak compensation circuit that generates a gain peak at the same frequency. This compensates for the gain dip, maintaining control loop stability while preserving the filtering performance of the LC filter. The harmful effect of the gain dip is transformed into a useful compensation mechanism.
Solution Approach 2:
The peak compensation circuit acts as an intermediary element between the LC filter and the control loop. It mediates the interaction by introducing a gain peak that counteracts the gain dip caused by the LC filter, thereby enabling stable control loop operation without compromising filtering performance.
2Reliability
If low-inductance inductors and polymer capacitors are used, then filtering performance is improved, but control loop compensation becomes more difficult due to deeper and higher frequency gain dips
Solution Approach 1:
The patent addresses the challenge of deeper and higher frequency gain dips by adjusting the parameters of the peak compensation circuit. By tuning the resonance frequency and gain of the compensation circuit to match the characteristics of the LC filter formed by low-inductance inductors and polymer capacitors, the patent achieves effective compensation without increasing overall system complexity.
3Stability of the object's composition
If peak compensation circuit is added to compensate for gain dip, then control loop stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the peak compensation circuit with the existing control loop structure of the power filter. By integrating the compensation functionality into the existing circuit architecture rather than adding completely separate components, the patent achieves control loop stability improvement while minimizing the increase in device complexity.
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 LCR parallel resonance circuit effectively compensates for the gain dip, stabilizing the control loop without requiring a high crossover frequency, thus maintaining loop stability and simplifying the compensation process.
Implementation Method 1
The peak compensation circuit is implemented as an LCR parallel resonance circuit
Data Source
Figure 1~2
Figure 3~4
Figure 5A~5B
AI summary
The present disclosure provides a power filter. The power filter may include an overvoltage protection circuit and an LC filter circuit connected to the overvoltage protection circuit, wherein the overvoltage protection circuit includes a voltage regulator and a peak compensation circuit. The peak compensation circuit is configured to generate a gain peak at a resonance frequency of the LC filter circuit, so as to compensate for a gain dip at the voltage regulator stage occurring at the resonance frequency of the LC filter circuit.