Adaptive Overvoltage Protection Circuit for Power Systems
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Solution Overview
Problem
Conventional over-voltage protection circuits fail to accurately recognize over-voltage states due to fixed reference voltages, which do not account for varying load magnitudes, leading to potential damage to power supply devices and loads.
Innovation Solution
An adaptive over-voltage protection circuit that adjusts the over-voltage protection reference voltage based on the load state by comparing the output voltage with multiple pre-set levels, generating a suitable reference voltage to prevent over-voltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed over-voltage protection reference voltage is used regardless of load magnitude, then the circuit structure is simple, but the over-voltage state cannot be accurately recognized when load varies
Solution Approach 1:
The patent implements dynamic adjustment of the over-voltage protection reference voltage based on load magnitude. The reference voltage provider selectively outputs different reference voltage levels (first level for small loads, second level for large loads) according to the actual load condition, making the protection threshold adaptive rather than fixed. This resolves the contradiction by enabling accurate over-voltage recognition across varying loads while maintaining reasonable circuit complexity through controlled adaptability.
Solution Approach 2:
The patent changes the parameter of reference voltage magnitude according to load magnitude. When load magnitude is small, a first reference voltage level is used; when load magnitude is large, a second reference voltage level is used. This parameter adaptation allows the over-voltage protection circuit to accurately recognize over-voltage states under different loading conditions without requiring an overly complex circuit structure.
2Measurement precision
If the over-voltage protection reference voltage is generated separately to meet specific load magnitude, then the over-voltage recognition accuracy improves, but the device complexity and operation difficulty increase
Solution Approach 1:
The patent enables the over-voltage protection circuit to automatically adapt to different load magnitudes without requiring external configuration or manual adjustment. The reference voltage provider internally selects the appropriate reference voltage level based on detected load conditions, making the system self-configuring and easy to operate while maintaining high over-voltage recognition accuracy.
Solution Approach 2:
The patent designs the over-voltage protection circuit with universal adaptability to handle multiple load magnitudes using a single integrated circuit. The reference voltage provider can supply different reference voltage levels as needed, making the same circuit applicable to both small and large load scenarios without requiring separate protection circuits for each load type.
3Reliability
If no adaptive reference voltage adjustment is implemented, then the circuit structure remains simple, but over-voltage damage risk increases under varying load conditions
Solution Approach 1:
The patent implements dynamic reference voltage adjustment that activates only when load magnitude changes require it. The reference voltage provider monitors load conditions and selectively switches between different reference voltage levels, providing reliable over-voltage protection adapted to actual operating conditions while avoiding unnecessary circuit complexity when a single reference voltage level suffices.
Data Source
AI summary
An adaptive over-voltage protection circuit includes an over-voltage protection reference voltage provider and an over-voltage signal output unit. The over-voltage protection reference voltage provider provides a voltage of an over-voltage protection level higher than that of an over-voltage protection voltage corresponding to an output voltage supplied to a load from among a plurality of different over-voltage protection levels as an over-voltage protection reference voltage when the output voltage reaches a range of a rated voltage of the load. The over-voltage signal output unit outputs an over-voltage signal indicating an over-voltage by comparing the over-voltage protection voltage with the over-voltage protection reference voltage.