Active Rectifier Surge Shutdown With Adaptive Restart Control
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Solution Overview
Problem
Existing active-rectifier circuits fail to efficiently protect switches from surge damage due to prolonged safety time periods, which cannot confirm the disappearance of surges, affecting overall efficiency.
Innovation Solution
A power supply device with a surge-discharge circuit, detection circuit, rectification-control circuit, protection-control circuit, and drive circuit that immediately turns off the active-rectifier switch during a surge and resumes operation once it dissipates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switch maintains a fixed safety time period after surge detection, then the switch is protected from surge damage, but the waiting time is too long and affects overall efficiency
Solution Approach 1:
The patent changes the fixed safety time period into a dynamic, adaptive waiting time that automatically adjusts based on real-time surge detection. The control circuit monitors surge signals continuously and dynamically extends or reduces the waiting time period according to actual surge conditions, rather than using a predetermined fixed time. This dynamic adjustment mechanism resolves the contradiction by protecting the switch reliably while minimizing unnecessary waiting time and maintaining high overall efficiency.
Solution Approach 2:
The patent implements a feedback mechanism where the control circuit continuously monitors surge signals and uses this feedback information to adjust the waiting time period. The detection circuit provides real-time feedback about surge presence, and the control circuit responds by dynamically modifying the safety time period. This closed-loop feedback system ensures the switch is protected only for the necessary duration, avoiding excessive waiting time and improving overall system efficiency while maintaining reliable protection.
2Reliability
If the switch is turned off immediately when surge occurs, then the switch is protected from surge energy, but it is impossible to confirm whether the surge has disappeared
Solution Approach 1:
The patent applies preliminary action by implementing a dynamic waiting time period before allowing the switch to resume operation after surge detection. During this waiting period, the control circuit continuously monitors for surge signals to confirm their complete disappearance. This preliminary monitoring action ensures that the switch is only reopened when it is certain the surge has fully dissipated, resolving the contradiction between immediate protection and accurate surge disappearance confirmation.
Solution Approach 2:
The patent uses feedback monitoring during the waiting time period to confirm surge disappearance. The detection circuit continuously provides feedback about surge signal presence, and only when continuous feedback confirms no surge signals are present does the control circuit allow the switch to resume operation. This feedback-based confirmation mechanism ensures accurate detection of surge disappearance while maintaining switch protection, resolving the contradiction between immediate action and measurement precision.
Data Source
AI summary
A power supply device includes an input port, an active-rectifier circuit, a surge-discharge circuit, a detection circuit, a rectification-control circuit, a protection-control circuit, and a drive circuit. The surge-discharge circuit is coupled between the input port and the active-rectifier circuit. The detection circuit outputs an output signal, normally a regular signal, to the protection-control circuit and, in response to detecting a surge signal from the surge-discharge circuit, changes the output signal to an activation signal. The protection-control circuit, in response to receiving the regular signal, outputs the control signal as an operation signal. The drive circuit then outputs a drive signal to the active-rectifier circuit according to the operation signal. The protection-control circuit, in response to receiving an activation signal, temporarily interrupts outputting the control signal as the operation signal. The drive circuit then stops outputting the drive signal.