Charge Pump Oscillator Control for Dynamic Current Bursts
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Solution Overview
Problem
Current supply pumps face a trade-off between current capability and efficiency, as increasing current demand reduces efficiency and vice versa, due to the fixed periodicity of pump cycles controlled by oscillators.
Innovation Solution
Incorporating an edge timer that dynamically adjusts the oscillator frequency based on a threshold parameter of the pump enable signal, allowing the pump circuit to increase current capability while maintaining or sacrificing efficiency as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the oscillator controls the pump to pump at a higher frequency to increase current output, then the current capability is improved, but the efficiency decreases
Solution Approach 1:
The patent applies dynamics by making the oscillator frequency adjustable rather than fixed. The system dynamically changes the pump frequency based on real-time feedback from the output voltage and current demands. When high current is needed, the oscillator frequency increases; when lower current suffices, the frequency decreases to maintain efficiency. This dynamic adaptation resolves the contradiction between current capability and efficiency.
Solution Approach 2:
The patent changes the parameter of oscillator frequency based on system conditions. The feedback mechanism monitors output voltage and current demand, then adjusts the oscillator frequency parameter accordingly. This parameter change allows the system to optimize between current output and efficiency by selecting appropriate frequency levels for different operating conditions.
2Loss of energy
If the oscillator controls the pump to pump at a reduced number of cycles to improve efficiency, then the efficiency is improved, but the current capability is limited
Solution Approach 1:
The system dynamically adjusts the oscillator frequency based on feedback, allowing it to switch between high-frequency (high current) and low-frequency (high efficiency) modes as needed. This dynamic behavior enables the system to achieve high current capability when necessary while maintaining high efficiency during normal operation, resolving the contradiction between these two parameters.
Solution Approach 2:
The patent employs a feedback mechanism that monitors output voltage and current demand, then feeds this information back to the oscillator to adjust its frequency. This closed-loop control ensures the system automatically adapts its current capability to match actual demands, preventing unnecessary high-frequency operation that would waste energy while ensuring sufficient current is available when needed.
3Device complexity
If a fixed frequency oscillator is used to control the pump, then the device complexity is reduced, but the adaptability to different current demands decreases
Solution Approach 1:
The patent changes the oscillator frequency parameter dynamically based on feedback from the system's output and demand conditions. This parameter adjustment capability provides adaptability to different current demands without requiring multiple fixed-frequency oscillators or complex switching mechanisms, thus maintaining relatively simple device architecture while achieving versatile current control.
Data Source
AI summary
A pump system that can dynamically increase its current capability includes: a pump circuit, for producing an output voltage; an oscillator, for driving the pump circuit to pump at a particular frequency according to a pump enable signal; a limiter, coupled to both the oscillator and the output voltage fed back from the pump circuit, for generating the pump enable signal to the oscillator according to the output voltage feedback signal; and an edge timer, coupled to both the oscillator and the pump enable signal, for driving the oscillator to operate at an increased frequency according to a threshold parameter of the pump enable signal.