Charge Pump Control Circuit Dynamic Frequency Adjustment
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Solution Overview
Problem
Charge pump circuits face challenges in quickly regulating to a stable state while maintaining high power density and efficiency, as increasing capacitor size or operation frequency either increases chip volume or reduces efficiency due to power losses.
Innovation Solution
A control method that detects the difference between output and input voltages in real time, generates an error amplifying signal, and adjusts the frequency of a control voltage signal to control the charge pump circuit, allowing it to quickly enter a stable state with reduced equivalent resistance and static operation current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If capacitor size is increased to improve power density, then power density is improved, but chip volume increases
Solution Approach 1:
The patent applies dynamic frequency adjustment of the control signal based on real-time voltage difference detection. The operating frequency changes dynamically according to load conditions, allowing the charge pump to achieve high power density during transient states without requiring oversized capacitors, thus resolving the contradiction between power density and chip volume.
Solution Approach 2:
The patent changes the operating parameter (frequency) of the charge pump circuit based on detected voltage differences. By adjusting frequency rather than capacitor size, the system achieves improved power density during startup and transient conditions without increasing chip volume, effectively resolving the technical contradiction.
2Speed
If operation frequency is increased to improve response speed, then response speed is improved, but efficiency reduces due to power losses
Solution Approach 1:
The patent implements dynamic frequency adjustment where the charge pump operates at high frequency only during transient states when voltage difference exceeds the threshold, and switches to low frequency during steady-state operation. This dynamic approach improves response speed when needed while minimizing power losses during normal operation, resolving the contradiction between speed and energy loss.
Solution Approach 2:
The patent uses periodic high-frequency operation triggered by voltage difference detection. Instead of continuous high-frequency operation, the system applies high frequency periodically only when transients occur, achieving fast response during critical moments while avoiding continuous power losses, thus resolving the contradiction between response speed and efficiency.
3Loss of time
If high operation frequency is used to quickly regulate to stable state, then stabilization speed is improved, but static operation current increases
Solution Approach 1:
The patent employs periodic high-frequency operation only during transient regulation phases when voltage difference exceeds the threshold. During steady-state operation, the frequency reduces to minimum levels. This periodic high-frequency action achieves rapid stabilization without maintaining high static operation current, resolving the contradiction between stabilization speed and static current consumption.
Solution Approach 2:
The patent dynamically adjusts operating frequency based on real-time voltage difference detection. The system transitions from high frequency during transient regulation to low frequency during steady-state operation, achieving fast stabilization while minimizing static operation current, effectively resolving the contradiction between stabilization time and energy consumption.
Data Source
AI summary
A method of controlling a charge pump circuit can include: (i) detecting a difference between an output voltage and an input voltage in real time; (ii) generating an error amplifying signal by comparing the difference between the output voltage and the input voltage against a predetermined difference; and (iii) generating a control voltage signal for controlling the charge pump circuit according to the error amplifying signal, where a frequency of the control voltage signal positively changes along with the difference between the output voltage and said input voltage when the difference between the output voltage and the input voltage is greater than the predetermined difference.