Adaptive Feedback Control for Power Converter Stability
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Solution Overview
Problem
The existing power converter technology, as described in JP 2003-36991 A, faces instability and insufficient response speed in feedback control systems due to changes in the frequency characteristic of the chopper circuit, especially when the operating range of input and output voltage and load is wide.
Innovation Solution
A power converter with a chopper circuit, voltage detection circuit, and control circuit that adjusts the frequency characteristic of feedback control based on output voltage, input voltage, and duty ratio information, allowing for dynamic changes in feedback control to maintain stability and response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the feedback control response is lowered to stabilize the system when chopper circuit frequency characteristic changes, then the stability of feedback control is improved, but the response speed becomes insufficient
Solution Approach 1:
The patent applies dynamics by making the feedback control system adaptive rather than static. The control circuit dynamically adjusts the feedback control characteristics based on detected operating conditions (input voltage, output voltage, duty ratio). This allows the system to maintain optimal response speed across varying operating ranges while ensuring stability when the chopper circuit frequency characteristic changes, directly resolving the contradiction between fixed stability and variable response speed.
Solution Approach 2:
The patent changes control parameters (feedback control characteristics) based on operating conditions. The control circuit detects input voltage, output voltage, and duty ratio, then adjusts feedback control parameters accordingly. This parameter adaptation enables the system to maintain both stability and appropriate response speed across different operating points, resolving the contradiction by making parameters variable rather than fixed.
2Adaptability or versatility
If the operating range of input and output voltage and load is widened, then the adaptability of the power converter is improved, but the frequency characteristic of the chopper circuit changes significantly
Solution Approach 1:
The patent uses feedback by having the control circuit continuously detect operating conditions (input voltage, output voltage, duty ratio) and adjust feedback control characteristics based on these detections. This closed-loop feedback mechanism compensates for frequency characteristic changes in the chopper circuit that occur when operating range is widened, maintaining stability while enabling broad adaptability.
Solution Approach 2:
The patent makes the feedback control system dynamic and adaptive to operating conditions. By detecting voltage and duty ratio levels and adjusting control characteristics accordingly, the system can maintain stable frequency characteristics across a wide operating range, resolving the contradiction between broad adaptability and characteristic stability.
Data Source
AI summary
To provide a power converter which can maintain the stability and the response of the feedback control system, even if the frequency characteristic of the chopper circuit changes according to change of driving condition. A power converter is provided with a chopper circuit which has reactor and switching device; and a control circuit which changes a feedback value of duty ratio of the switching device so that a deviation between a target value of output voltage and a detection value of output voltage approaches to 0, wherein the control circuit changes a frequency characteristic of the feedback control, based on at least any two or more of information on the output voltage, information on an input voltage, and information on duty ratio.