Charge Pump Voltage Conversion Circuit With Pole Compensation
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Solution Overview
Problem
Voltage conversion circuits in charge pumps suffer from poor stability due to the difficulty in compensating three-pole circuit systems, leading to instability in output voltage.
Innovation Solution
The proposed voltage conversion circuit includes a first, second, and third charge-discharge branch connected in parallel, with a compensation resistor in series in the third branch, and utilizes transistors and current branches controlled by sampling circuits and drive circuits to stabilize the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage conversion circuit with multiple energy storage circuits and charge circuits is used, then the output voltage can be stabilized at a target voltage, but the circuit becomes equivalent to a three-pole system which is difficult to compensate, resulting in poor stability
Solution Approach 1:
The patent introduces a compensation capacitor connected between the output node and the first input node as an intermediary element. This capacitor acts as a mediator that provides frequency compensation for the three-pole system, transforming it into an effectively compensated system. The compensation capacitor creates a feedback path that stabilizes the output voltage by counteracting the effects of the three poles, thereby resolving the stability issue without requiring fundamental changes to the charge pump architecture.
2Adaptability or versatility
If switching transistors and storage capacitors are used to create a charge pump circuit, then voltage conversion can be achieved, but the resulting three-pole circuit system is difficult to compensate, leading to instability
Solution Approach 1:
The compensation capacitor creates an implicit feedback mechanism by connecting the output node back to the first input node. This feedback path allows the circuit to automatically adjust and stabilize the output voltage by sensing output variations and counteracting them through the capacitive coupling. The feedback mechanism transforms the unstable three-pole system into a stable voltage conversion circuit while preserving the adaptability of the charge pump architecture.
Data Source
AI summary
The present disclosure relates to the technical field of charge pumps, and in particular, relates to a voltage conversion circuit, a chip, a charge pump, and an electronic device. The voltage conversion circuit includes a first charge-discharge branch, a second charge-discharge branch, a third charge-discharge branch, a compensation resistor, a first current branch, and a second current branch. Introduction of a compensation resistor introduces a zero to the entire circuit, such that the voltage conversion circuit is substantially equivalent to a single-pole system, ensuring overall stability of the voltage conversion circuit.