Dynamic Overvoltage Threshold for Switching Power Converters
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Solution Overview
Problem
Existing overvoltage protection systems in switching power mode converters face challenges in accurately detecting overvoltage conditions due to 'double knee point' scenarios, leading to potential damage from overcharging, inefficiencies, and increased costs due to complex circuitry and higher material bills.
Innovation Solution
An overvoltage protection module that dynamically adjusts the transition threshold based on a previously sensed supply voltage at a VCC pin, allowing the system to transition from a high start-up voltage to a low steady-state voltage while preventing overvoltage conditions, using a gate driver module and overvoltage protection module to selectively activate switching elements and determine overvoltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed overvoltage protection threshold is used, then the circuit can protect components from overvoltage damage, but it cannot accommodate the transition from high start-up voltage to low steady-state voltage
Solution Approach 1:
The patent applies the dynamics principle by making the overvoltage protection threshold dynamic rather than fixed. The threshold automatically adjusts based on the operating state of the circuit: during start-up, it allows higher voltages to accommodate the natural voltage spike, while during steady-state operation, it enforces a lower threshold to protect components. This is achieved through state detection circuitry that monitors whether the circuit is in start-up or steady-state mode and accordingly selects the appropriate threshold level.
2Measurement precision
If complex circuitry is used to detect double knee point scenarios, then overvoltage detection accuracy can be improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies the preliminary action principle by pre-establishing two distinct voltage thresholds before operation begins: a higher start-up threshold and a lower steady-state threshold. The circuit is designed to automatically transition between these thresholds based on predefined conditions (such as detection of voltage stabilization or elapsed time). This eliminates the need for complex real-time analysis of voltage waveform characteristics like the 'double knee point' scenario, as the system has already predetermined the appropriate thresholds for each operating phase.
Data Source
AI summary
A device for overvoltage protection includes a gate driver module and an overvoltage protection module. The gate driver module is configured to selectively activate a switching element to provide input power to a primary side winding of a transformer for generating a target output at a secondary side winding of the transformer. The overvoltage protection module is configured to determine a transition threshold based on a previously sensed supply voltage at a voltage supply pin configured to receive power for operating the circuit from a primary side auxiliary winding of the transformer and determine the circuit is operating in an overvoltage condition when a current supply voltage at the voltage supply pin exceeds the transition threshold, wherein the current supply voltage occurs at the supply pin after the previously sensed supply voltage.