Charge Pump Switch Resistance Feedback Loop
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Solution Overview
Problem
Charge pumps induce noise in incoming current and result in unstable output voltage due to switching states of switches, leading to fluctuations in the output voltage.
Innovation Solution
A charge pump design featuring switches with adjustable on-state resistance and a feedback loop that monitors the output voltage to regulate the resistances of the switches, using an oscillator to generate pulse signals for controlling the switches' states, thereby stabilizing the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If switches are used to alternatively charge and discharge the capacitor, then voltage conversion is achieved, but noise is induced on incoming current
Solution Approach 1:
The patent employs a feedback loop that monitors the incoming current and adjusts the on-state resistance of the switches dynamically. The feedback signal from the current sense amplifier controls the resistance of the fourth switch to compensate for noise-induced fluctuations, thereby stabilizing the incoming current while maintaining voltage conversion functionality.
Solution Approach 2:
The patent changes the resistance parameter of the switches dynamically during operation. By adjusting the on-state resistance of the fourth switch based on feedback from the current sense amplifier, the system optimizes current flow and reduces noise impact, resolving the contradiction between maintaining power conversion and eliminating harmful noise effects.
2Power
If switches are switched open and close alternatively, then charge pumping is achieved, but output voltage becomes unstable
Solution Approach 1:
The feedback loop continuously monitors the output voltage and adjusts the resistance of the first and fourth switches to compensate for voltage fluctuations. This feedback mechanism stabilizes the output voltage while preserving the charge pumping function by dynamically optimizing switch resistance during operation.
Solution Approach 2:
The patent makes the switch resistance dynamic rather than fixed. The on-state resistance of the switches is adjusted in real-time based on feedback signals, allowing the system to adapt to changing conditions and maintain stable output voltage while continuing to perform charge pumping operations.
3Loss of energy
If switch resistance is reduced to improve efficiency, then noise impact increases
Solution Approach 1:
The patent dynamically changes the resistance parameter of the switches based on operating conditions. The feedback loop adjusts the on-state resistance to optimize the balance between reducing switching losses and minimizing noise sensitivity, achieving both energy efficiency and noise reduction simultaneously.
Data Source
AI summary
A charge pump includes a first capacitor, a first switch with adjustable on-state resistance, a second switch, a third switch, a fourth switch, a feedback loop, and an oscillator. The first switch is coupled between a first electrode of the first capacitor and an output node. The second switch is coupled between a second electrode of the capacitor and ground. The third switch is coupled between an input node and the second electrode of the capacitor. The fourth switch with adjustable on-state resistance is coupled between the input node and the first electrode of the capacitor. The feedback loop monitors a regulated voltage of the output node and generates a control signal to regulate resistances of the first, fourth switches. The oscillator generates a first and second pulse signals to switch the open and close states of the first, third switches and the second, fourth switches, respectively.