Charge Pump Stability Control via Feedback Current Adjustment
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Solution Overview
Problem
Charge pumps coupled with current sources face challenges in maintaining stable voltage across capacitors, leading to charge accumulation and potential switch overheating due to uneven voltage drift, which can result in instability and component destruction.
Innovation Solution
A controller is used to adjust currents between the charge pump and the circuit based on feedback measurements, ensuring each pump capacitor starts each cycle in the same condition by controlling the residence times and modulating the duty cycle of the switch to maintain a constant interstate differential and average voltage, thereby preventing charge accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a charge pump operates with a current source without control mechanisms, then the circuit can function with available power, but charge accumulates on pump capacitors causing voltage drift over time
Solution Approach 1:
The patent implements a feedback control mechanism where the controller monitors the charge or voltage on pump capacitors and adjusts the switching sequence or residence times to maintain charge balance. This feedback loop prevents charge accumulation by detecting and correcting imbalances, thereby maintaining voltage stability while enabling continuous power conversion operation.
Solution Approach 2:
The patent employs dynamic adjustment of pump-state residence times and switching sequences based on real-time charge conditions. By making the operating parameters variable rather than fixed, the system can adapt to prevent charge accumulation, resolving the contradiction between continuous operation and voltage stability.
2Duration of action of moving object
If voltages across pump capacitors drift unevenly, then charge pump operation continues, but the voltage across switches exceeds ratings causing overheating and destruction
Solution Approach 1:
The patent applies preliminary control actions by monitoring capacitor voltages and adjusting switching sequences before voltage imbalances reach dangerous levels. This preventive approach ensures switch voltage ratings are never exceeded, maintaining reliability while allowing continuous operation. The controller proactively balances charges to prevent harmful voltage drift before it occurs.
3Stability of the object's composition
If residence times are adjusted to prevent charge accumulation, then voltage stability improves, but control complexity increases
Solution Approach 1:
The patent implements a self-balancing mechanism where the charge pump system automatically adjusts its own operating parameters through integrated sensing and control. The controller uses simple feedback from voltage or charge sensors to autonomously modify residence times and switching sequences, maintaining voltage stability without requiring external complex control systems or manual intervention.
Data Source
AI summary
During its first and second residence times, corresponding first and second currents flow between a charge pump and a circuit that connects to one of the charge pump's terminals. Based on a feedback measurement from the charge pump, a controller adjusts these first and second currents.