Adaptive Over Voltage Protection Circuit for Voltage Converters
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Solution Overview
Problem
Conventional voltage converters require high withstand voltage components and increased circuit size and manufacturing costs due to fixed over voltage protection thresholds, which are not adaptive to varying output voltages.
Innovation Solution
A system comprising a voltage detection circuit, an over voltage protection reference signal output circuit, and an over voltage control signal output circuit that dynamically controls the over voltage protection by continuously detecting output voltage and generating adaptive protection thresholds based on voltage feedback signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed upper bound voltage is used for over voltage protection, then circuit protection function is provided, but high withstand voltage components are required leading to increased circuit size and manufacturing cost
Solution Approach 1:
The patent applies dynamics by making the over voltage protection threshold adaptive rather than fixed. The control unit dynamically adjusts the protection threshold based on the actual output voltage of the voltage converter. When the voltage converter provides multiple voltages (e.g., normal charging voltage and quick charging voltage), the protection threshold automatically adapts to the current operating voltage level, thereby preventing the need for high withstand voltage components designed for the maximum possible voltage.
Solution Approach 2:
The patent changes the parameter of protection threshold from a fixed value to a variable value that changes according to operating conditions. The control unit monitors the output voltage and adjusts the protection threshold parameter accordingly. This parameter change allows the system to use lower withstand voltage components while maintaining adequate protection, thus reducing circuit size and manufacturing cost.
2Reliability
If high withstand voltage components are used for fixed over voltage protection, then circuit damage risk is reduced, but circuit size increases
Solution Approach 1:
The system dynamically adjusts the protection threshold to match the actual output voltage level. When operating at lower voltages (e.g., normal charging mode), the protection threshold is set accordingly, allowing the use of smaller components with lower withstand voltage ratings. This dynamic adaptation maintains circuit damage protection while minimizing circuit size.
Solution Approach 2:
The protection threshold parameter is changed from a conservative fixed high value to a dynamic value that reflects actual operating conditions. This parameter optimization allows selection of components with appropriate withstand voltage ratings for each operating mode, reducing overall circuit size while maintaining adequate protection against over voltage conditions.
Data Source
AI summary
A system for dynamically controlling over voltage protection includes a voltage detection circuit, an over voltage protection reference signal output circuit, and an over voltage control signal output circuit. The voltage detection circuit is used for detecting a voltage and outputting a sampled voltage according to the voltage. The over voltage protection reference signal output circuit is coupled to the voltage protection circuit for generating an over voltage protection reference signal according to the sampled voltage and a voltage feedback signal. The over voltage control signal output circuit is coupled to the voltage detection circuit and the over voltage protection reference signal output circuit for generating an over voltage control signal according to the sampled voltage and the over voltage protection reference signal.