Dynamic Charge Pump Control Circuit for Low Power Voltage Regulation
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Solution Overview
Problem
Conventional charge pump control circuits face challenges in achieving rapid voltage regulation while minimizing undulations and maintaining low consumption, as high-speed regulation is incompatible with low consumption requirements.
Innovation Solution
A dynamic comparison method is implemented using a timing signal from the clock signal to generate a control signal, with a latch initialization on falling edges and comparison on rising edges, reducing continuous comparator operation and enabling efficient control of charge pump circuits with low current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a static comparator continuously compares voltages to ensure rapid regulation, then voltage regulation speed is improved, but current consumption increases
Solution Approach 1:
The patent applies periodic action by using a dynamic comparator that operates only during specific clock cycles (rising edges) rather than continuously. The comparator is activated periodically synchronized with the clock signal, performing voltage comparison only when needed for regulation, thereby reducing average current consumption while maintaining regulation speed through timely periodic operation
Solution Approach 2:
The patent implements dynamics by transitioning from a static comparator architecture to a dynamic comparator architecture. The dynamic comparator's operation state changes based on clock signal edges, allowing it to be active during rising edges for rapid regulation and inactive during falling edges to minimize consumption, thus adapting its behavior to operational requirements
2Adaptability or versatility
If the charge pump is dimensioned to generate high voltage from the lowest supply voltage value, then compatibility with low supply voltage is improved, but undulations of the regulated voltage increase when high supply voltage is applied
Solution Approach 1:
The patent applies feedback by implementing a closed-loop voltage regulation system where the dynamic comparator continuously monitors the relationship between the divided pump voltage (Vpump/K) and reference voltage (VREF). Based on the comparison result, the control signal adjusts the charge pump operation to maintain stable output voltage across varying supply conditions, correcting undulations through real-time feedback control
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the charge pump control signal based on the comparison outcome between Vpump/K and VREF. The system changes operational parameters (pump activation timing and duration) in response to supply voltage variations, enabling stable regulation whether the supply is at minimum or maximum values
Data Source
AI summary
A charge pump circuit can be controlled by a control signal that is generated from a first signal coming from and output signal of the charge pump circuit, from a reference signal, and from a clock signal. The generation of the control signal includes a comparison of the reference signal and of the first signal in tempo with a timing signal coming from the clock signal.