Power Supply Control Circuit Peak Detection Protection
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Solution Overview
Problem
Conventional power supply control circuits fail to accurately protect the power supply due to voltage ripple in the input voltage, which affects precise comparison and control of the switching signal, thereby reducing safety and efficiency.
Innovation Solution
A control circuit with a peak-detection circuit, sample-hold circuit, and protection circuit that detects the peak of the AC input voltage, generates a peak-detection signal, and uses a reset signal to control the power supply output, ensuring accurate protection by eliminating voltage ripple through a switching signal controlled by a pulse signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filter capacitor is used to filter the input voltage, then the voltage ripple is reduced, but the response time of the protection circuit is delayed
Solution Approach 1:
The patent divides the voltage detection function into two separate paths: one path detects the peak voltage without filtering to ensure fast response, while another path can use filtering for precise comparison. This segmentation allows the system to simultaneously achieve fast protection response and accurate voltage comparison by processing different aspects of voltage detection through different filtering approaches.
2Speed
If voltage ripple is present in the input voltage, then the comparison precision is improved (faster response), but the protection accuracy deteriorates
Solution Approach 1:
The patent implements preliminary peak detection before the main comparison operation. By detecting and holding the peak voltage value in advance through a dedicated detection circuit, the system prepares accurate comparison data beforehand, allowing the main protection circuit to operate with both speed and accuracy without being affected by voltage ripple during the critical comparison moment.
3Device complexity
If a simple voltage divider is used for voltage detection, then the device complexity is reduced, but the detection precision deteriorates
Solution Approach 1:
The patent introduces a peak detection circuit as an intermediary component between the voltage divider and the comparison circuit. This intermediary captures and holds the peak voltage value, providing a stable and accurate reference for comparison. The voltage divider remains simple for basic voltage sampling, while the peak detection intermediary ensures precise measurement without requiring a complex voltage divider design.
Data Source
AI summary
A control circuit with protection circuit for power supply according to the present invention comprises a peak-detection circuit and a protection circuit. The peak-detection circuit detects an AC input voltage and generates a peak-detection signal. The protection circuit generates a reset signal to reduce the output of the power supply in response to the peak-detection signal. The present invention can protect the power supply in response to the AC input voltage effectively through the peak-detection circuit.