Charge Pump Driving Capability Adjustment for Ripple Stability
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Solution Overview
Problem
Charge pump devices face instability under varying loadings and external components, with operational amplifier-controlled devices having smaller but unstable output ripples and comparator-controlled devices experiencing larger periodic output ripples, which can lead to insufficient driving capability when trying to reduce ripples.
Innovation Solution
A charge pump device with a driving stage, comparing circuit, overload detection circuit, and driving capability control circuit that adjusts driving capability based on whether the output voltage reaches and maintains a target voltage, balancing output ripple and loading driving capability by controlling the number of times and amplitude of the driving signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If operational amplifier is used for controlling the charge pump device, then output voltage has smaller output ripples, but the output voltage becomes unstable under different loadings and external components
Solution Approach 1:
The patent employs feedback control by comparing the output voltage with a reference voltage through an operational amplifier. The comparing circuit generates a control signal based on the voltage difference, which is fed back to adjust the driving capability of the charge pump circuit. This closed-loop feedback mechanism maintains output voltage stability under varying load conditions while minimizing output ripples through continuous error correction.
Solution Approach 2:
The patent dynamically adjusts the driving capability of the charge pump circuit by varying the number of times the driving signal is triggered within each clock period. The control circuit modifies the driving signal characteristics based on the output voltage feedback, enabling the system to adapt to different loading conditions and maintain stability without excessive ripples.
2Stability of the object's composition
If comparator is used for controlling the charge pump device, then output voltage is stable under different loadings, but the output voltage has greater periodic output ripples and may have noise in audio frequency band
Solution Approach 1:
The patent uses feedback control where the operational amplifier continuously compares the output voltage with the reference voltage and adjusts the driving signal accordingly. This analog feedback mechanism provides smooth error correction, reducing periodic ripples and audio frequency noise compared to digital comparator-based control, while maintaining stability under varying loads.
Solution Approach 2:
The patent implements periodic triggering of the driving signal within each clock period, where the number of trigger events is dynamically adjusted based on feedback. This controlled periodic action allows the charge pump to deliver sufficient driving capability for heavy loads while minimizing excessive periodic ripples by optimizing the triggering frequency and amplitude.
3Object-generated harmful factors
If driving capability is reduced to minimize output ripples, then output ripple decreases, but loading driving capability becomes insufficient
Solution Approach 1:
The patent dynamically adjusts the driving capability by varying the number of times the driving signal is triggered within each clock period based on real-time feedback from the comparing circuit. When output voltage drops indicate heavy loading, the system increases triggering frequency to boost driving capability. When output voltage is stable, it reduces triggering to minimize ripples, thus adaptively optimizing both ripple reduction and driving capability.
Solution Approach 2:
The patent changes the parameters of the driving signal, specifically the number of trigger events per clock period and the amplitude of each trigger, to optimize performance. By adjusting these parameters dynamically based on feedback, the system achieves minimal output ripples under light loads while maintaining sufficient driving capability under heavy loads without requiring a fixed high-power design.
Data Source
AI summary
A charge pump device is disclosed. The charge pump device includes a driving stage, for generating a driving signal corresponding to a driving capability; a charge pump circuit, for generating an output voltage according to the driving signal; a comparing circuit, comprising a first comparator for comparing the output voltage and a first reference voltage to generate a first comparing result; an overload detection circuit, for generating a detection result according to at least one of the first comparing result and the output voltage; and a driving capability control circuit, coupled between the overload detection circuit and the driving stage for controlling the driving capability corresponding to the driving signal according to the detection result.