A Fast Boost Charge Pump System for Large Capacitors

Abstract

The invention discloses a quick boost charge pump system suitable for a large capacitor, which comprises a control circuit, a boost charge pump and a feedback circuit, wherein the control circuit generates a control signal transmitted to the boost charge pump after receiving an external signal; the boost charge pump receives the control signal, periodically charges and discharges a flying line capacitor, an output capacitor and a storage capacitor and generates an output voltage to the feedback circuit; and the feedback circuit compares the received output voltage with a set voltage value, andgenerates a feedback signal through a comparison result to control the work of the charge pump system. When the charge pump uses a large capacitor, the time for generating a stable output voltage isvery slow as the voltage difference between the capacitor ends is gradually reduced in the process of generating the stable voltage. Thus, the problem that the voltage establishment time of a large-capacitance charge pump is relatively long can be solved, so that a quick boost function can be realized.

Description

technical field [0001] The invention relates to semiconductor integrated circuit technology, in particular to a fast-boosting charge pump system. Background technique [0002] The charge pump structure is widely used in the design of power management systems for display screens or handheld devices. A charge pump, also known as a switched capacitor voltage converter, is a type of DC converter that uses capacitors instead of inductors or transformers to store energy. The input voltage can be raised or lowered by the charge pump, and can even be used to generate a negative voltage. It uses the internal field effect transistor (Field Effect Transistor, FET) switch array to control the transmission of charges on the capacitor in a certain way, usually clocked The signal controls the charging and discharging of the capacitor in the charge pump, so that the input voltage increases (or decreases) in a certain way to achieve the required output voltage. The basic idea of ​​the char...

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Problems solved by technology

[0003] The present invention aims to solve the shortcomings of the above-mentioned prior art, and proposes a fast step-up charge pump system suitable for large capacitors, in order to solve the problem that the voltage establishment time of the large capacitor charge pump is relatively long, so as to realize Quick boost function

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