Adaptive Charge Pump Circuit for Flying Capacitor Voltage Stability
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Solution Overview
Problem
Conventional charge pump circuits experience significant fluctuations in the voltage difference across the flying capacitor due to changes in the supply voltage, affecting circuit stability.
Innovation Solution
The charge pump circuit includes switches with adaptive current-carrying capabilities regulated by a selection circuit and an adjustment circuit, which adjusts the driving voltage based on power supply voltage conditions to maintain both switches in the saturation region, using an offset voltage to enhance the current-carrying capability of the first switch when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional charge pump circuits use fixed driving voltage for both switches, then the circuit structure is simple, but the voltage difference across the flying capacitor is significantly affected by changes in the supply voltage
Solution Approach 1:
The patent applies dynamics by making the driving voltage dynamic rather than fixed. The control circuit generates different driving voltages for the first and second switches based on the operating state, allowing the circuit to adapt to supply voltage changes and maintain stable voltage difference across the flying capacitor.
Solution Approach 2:
The patent changes the parameter of driving voltage from a single fixed value to multiple variable values. By adjusting the driving voltage of each switch independently based on operating conditions, the circuit maintains optimal performance across different supply voltage levels.
2Reliability
If the driving voltage for the first switch is reduced when power supply voltage is low, then the voltage difference stability improves, but the current-carrying capability of the first switch decreases
Solution Approach 1:
The patent uses parameter changes by adjusting the driving voltage of the first switch based on the power supply voltage level. When the power supply voltage is low, the driving voltage is reduced to maintain stability; when the power supply voltage is high, the driving voltage is increased to maintain current-carrying capability.
Solution Approach 2:
The patent applies dynamics by making the driving voltage adaptive and variable. The control circuit dynamically adjusts the driving voltage of each switch based on real-time operating conditions, ensuring optimal balance between stability and current-carrying capability across different power supply levels.
Data Source
AI summary
The present disclosure describes a charge pump circuit, comprising a first switch, a second switch and a flying capacitor. The first switch receives driving voltage when the clock signal is at the first level, while the second switch receives driving voltage at the second level. The flying capacitor charges via the first switch and discharges via the second switch to generate the output voltage. When the power supply voltage is lower than the preset output voltage, the driving voltage for the first switch is lower than that for the second switch. The present disclosure adaptively regulates the current-carrying capabilities of the first and second switches in accordance with the magnitude of the power supply voltage to ensure that the voltage difference across the flying capacitor is less affected by changes in the power supply voltage, thereby enhancing circuit stability.