Voltage Foldback Control for Startup Current Spike Mitigation
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Solution Overview
Problem
Existing systems face challenges in managing high current spikes and voltage distortions during startup or load changes in electronic devices, leading to tripped breakers, poor user experience, and inefficient power delivery.
Innovation Solution
Implementing a current limit-based voltage foldback control system that adjusts the voltage limit in response to output current thresholds, using asymmetrical fold and unfold rates to manage current spikes and maintain stable power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the voltage limit is rapidly reduced to mitigate current spikes, then the harmful effect of current spikes is reduced, but the voltage distortion and operational stability deteriorate
Solution Approach 1:
The patent implements dynamic adjustment of voltage limits based on real-time current conditions. The controller continuously monitors output current and dynamically modifies the voltage limit parameter, transitioning from a static voltage limit to a dynamic one that adapts to load changes. This resolves the contradiction by making the voltage limit flexible rather than fixed, allowing rapid reduction during spikes while maintaining stability during normal operation.
Solution Approach 2:
The patent changes the voltage limit parameter based on current threshold comparisons. When current exceeds the threshold, the voltage limit parameter is modified (reduced); when current is below the threshold, the voltage limit is restored. This parameter change strategy allows the system to mitigate current spikes by reducing voltage limit while maintaining normal voltage operation under standard conditions, thus resolving the stability concern.
2Reliability
If the voltage limit is quickly adjusted downward to protect against overcurrent, then the reliability is improved, but the response time and control precision worsen due to asymmetrical fold/unfold rates
Solution Approach 1:
The patent explicitly employs asymmetrical fold and unfold rates for voltage limit adjustment. The fold rate (reducing voltage limit) is set differently from the unfold rate (restoring voltage limit). This asymmetry allows rapid response to overcurrent conditions for protection while providing controlled restoration to maintain stability, directly addressing the time loss concern by optimizing each direction of adjustment independently.
Solution Approach 2:
The patent implements a feedback control mechanism where the controller continuously monitors output current and adjusts the voltage limit accordingly. When current exceeds the threshold, feedback triggers voltage limit reduction; when current returns below the threshold, feedback triggers restoration. This closed-loop feedback ensures reliable overcurrent protection while minimizing unnecessary adjustments, thus reducing time loss compared to open-loop systems.
3Power
If the voltage limit is maintained at maximum level, then the power delivery capability is improved, but the harmful effect of high current spikes increases
Solution Approach 1:
The patent dynamically changes the voltage limit parameter based on current conditions. Under normal operation, the voltage limit is maintained at maximum level to ensure optimal power delivery capability. When current spikes occur and exceed the threshold, the voltage limit parameter is reduced to mitigate the harmful effects. This parameter change strategy resolves the contradiction by allowing the system to have both high power capability and current spike protection at different times.
Solution Approach 2:
The patent transforms the static maximum voltage limit into a dynamic parameter that adapts to load conditions. The voltage limit remains at maximum during normal operation for optimal power delivery but automatically reduces during current spike events. This dynamic behavior resolves the contradiction between maintaining high power capability and preventing harmful current spikes by making the voltage limit responsive to real-time conditions.
Data Source
AI summary
An electronic device including a power output, a power source, configured to provide a voltage. A device may include a current sensor configured to measure the output current. A device may include a power switching network electrically connected between the power source and the power output. A device may include a controller electrically connected to the current sensor and the power switching network, the controller configured to: determine, using the current sensor, the output current. A device may include compare the output current to a predetermined load current threshold, determine a voltage limit of the voltage of the power source as a function of the difference between the output current and the predetermined load current threshold, and control the output current to drive the load, via the power switching network, based on the voltage limit.