Pulsed Feedback Switching Converter Primary Side Regulation
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Solution Overview
Problem
Existing power converters face challenges in implementing efficient primary side regulation without feedback, especially in isolated converters, which often result in reduced performance and accuracy due to the need for signal isolation across the isolation barrier.
Innovation Solution
A control unit with a signal conditioning circuit that includes a comparator to detect deviations from a setpoint, a control actuator to produce correction signals, and an averaging circuit to generate continuous control signals, allowing for discontinuous correction actions and primary side regulation without continuous feedback loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous feedback loops are used for regulation, then regulation accuracy is improved, but device complexity and need for signal isolation increase
Solution Approach 1:
The patent extracts the essential regulation function from the complex continuous feedback system by using discrete detection signals sampled at specific moments (e.g., at the end of each switching cycle). This allows regulation to be achieved without continuous feedback paths, reducing the need for isolation components while maintaining accuracy through periodic measurement and correction.
Solution Approach 2:
The patent implements a simplified feedback mechanism where the output quantity is detected at discrete time points and compared against reference values. The control unit generates correction signals based on these periodic comparisons, achieving regulation accuracy through targeted feedback moments rather than continuous feedback, thereby reducing system complexity.
2Reliability
If signal isolation across isolation barrier is implemented, then converter isolation is improved, but measurement precision and regulation accuracy deteriorate
Solution Approach 1:
The patent uses an intermediary approach by sampling the output quantity at discrete moments and transmitting only essential regulation information across the isolation barrier through the existing isolated power link. This avoids the need for complex continuous signal isolation while maintaining both isolation reliability and measurement precision through intelligent sampling and processing.
3Device complexity
If discontinuous correction actions are used, then device complexity is reduced, but loss of information increases
Solution Approach 1:
The patent applies preliminary action by detecting and processing the output quantity at strategically chosen moments (e.g., at the end of switching cycles when the system state is well-defined). This timing ensures that the discrete samples contain sufficient information for accurate regulation without requiring continuous monitoring, thus reducing complexity while minimizing information loss through intelligent sampling.
Data Source
AI summary
The present disclosure is directed to a switching power converter having a regulated output voltage or output current. The power converter uses a control unit having a signal conditioning circuit to produce a control voltage signal, which is used to drive a power stage of the converter. The signal conditioning circuit includes a comparator that compares a measured electrical quantity to a reference value representative of a desired regulated output quantity, and produces a digital detection signal based on the comparison. A control actuator uses the digital detection signal to produce a correction signal, which is received by an averaging circuit. The averaging circuit then produces the control voltage signal based on an average of the correction signal.