Insulated Switching Power Supply Timing for Stable Load Regulation
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Solution Overview
Problem
Conventional insulated switching power supplies have a suboptimal load regulation rate, which affects output stability with changes in load.
Innovation Solution
A power control device is designed with a feedback voltage generator, on-timing setting unit, and off-timing setting unit, including amplifiers, comparators, and correction circuits to regulate the primary current of a transformer, ensuring constant switching frequency and improved load regulation by synchronizing reference voltages and adjusting sampling timings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulated switch power supplies are used, then the power supply can operate with basic functionality, but the load regulation rate is insufficient and output stability deteriorates with load changes
Solution Approach 1:
The patent applies preliminary action by setting the sampling timing of the primary voltage based on the on-timing of the primary current before the voltage sampling actually occurs. The feedback voltage is sampled at a predetermined timing after the primary current turns on, ensuring that the sampling is performed at the optimal moment before voltage fluctuations affect accuracy. This preliminary timing arrangement improves load regulation rate and output stability without requiring complex real-time adjustments.
2Measurement precision
If the sampling timing of primary voltage is not synchronized with primary current on-timing, then the control circuit can operate independently, but the load regulation rate deteriorates
Solution Approach 1:
The patent implements feedback by using the on-timing signal of the primary current as a reference to determine the sampling timing of the primary voltage. The sampling timing is set based on this feedback from the current on-timing, creating a closed-loop timing synchronization mechanism. This feedback approach ensures that voltage sampling occurs at the optimal moment relative to current switching, improving measurement precision while keeping the synchronization mechanism relatively simple through direct signal correlation.
Data Source
AI summary
The present disclosure provides a power supply control device. The power supply control device includes a feedback voltage generator, an on-timing setting unit and an off-timing setting unit. The feedback voltage generator is configured to generate a feedback voltage by sampling a primary voltage of a transformer that forms an insulated switching power supply. The on-timing setting unit is configured to turn on a primary current of the transformer based on a comparison result between the feedback voltage and a slope-shaped reference voltage. The off-timing setting unit is configured to turn off the primary current after a predetermined on time has elapsed since the primary current was turned on. A sampling timing of the primary voltage is set based on an on timing of the primary current.