Power Supply Protection Circuit with Adjustable Reference Voltage
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Solution Overview
Problem
Existing protection circuits for power supplies require manual adjustment of protection parameters, leading to high time consumption and low stability, particularly in controlling over-loading protection effectively.
Innovation Solution
A protection circuit that adjusts the magnitude of a reference voltage using a variable current source to control a comparison unit, generating a protection signal to manage power supply output, thereby eliminating the need for manual parameter adjustments and enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual adjustment of protection parameters is used, then the protection circuit can be implemented, but the time consumption is high and stability is low
Solution Approach 1:
The protection circuit automatically adjusts the reference voltage through the adjustment unit based on detected output voltage levels, eliminating the need for manual parameter adjustment. The circuit self-regulates by comparing output voltage with the adjustable reference voltage and automatically modifying the reference voltage to achieve precise protection thresholds without human intervention.
Solution Approach 2:
The reference voltage is made dynamically adjustable through the adjustment unit, which can modify the reference voltage magnitude in response to detected conditions. This dynamic adjustment capability allows the protection circuit to adapt to different operating conditions and achieve precise protection without fixed manual settings.
2Reliability
If manual adjustment of protection parameters is used, then the protection circuit can be implemented, but the stability is low
Solution Approach 1:
The protection circuit automatically adjusts the reference voltage through the adjustment unit based on detected output voltage levels, eliminating the need for manual parameter adjustment. The circuit self-regulates by comparing output voltage with the adjustable reference voltage and automatically modifying the reference voltage to achieve precise protection thresholds without human intervention.
3Measurement precision
If the reference voltage is fixed, then the circuit is simple, but the protection accuracy is insufficient
Solution Approach 1:
The reference voltage is made dynamically adjustable through the adjustment unit, which can modify the reference voltage magnitude in response to detected conditions. This dynamic adjustment capability allows the protection circuit to adapt to different operating conditions and achieve precise protection without fixed manual settings.
Solution Approach 2:
The adjustment unit changes the magnitude of the reference voltage parameter based on detected output voltage conditions. By dynamically modifying the reference voltage parameter, the circuit achieves precise protection thresholds that adapt to different operating scenarios, improving measurement precision for protection detection.
Data Source
AI summary
A protection circuit for power supply is disclosed. The power supply includes a power conversion unit having a primary winding and a secondary winding. The primary winding receives an input voltage. The secondary winding is used for generating an output voltage. The protection circuit comprises a first impedance unit coupled to the secondary winding. A loading current of the power supply flows through the first impedance unit. The output voltage is generated at the first impedance unit. A second impedance unit is coupled to the secondary winding and generates a reference voltage. A comparison unit compares the output voltage and the reference voltage to generate a protection signal for turning off the power supply. A adjustment unit is coupled to the second impedance unit and the comparison unit and adjusts the magnitude of the reference voltage for controlling the comparison unit to output the protection signal.