Open-loop charge pump circuit capable of increasing output voltage ripple frequency

A technology for outputting voltage ripple and output voltage, applied in the field of open-loop charge pump circuit, can solve the problems of low ripple frequency and low sound quality, and achieve the effect of solving the problem of low sound quality and flexible and convenient setting.

Inactive Publication Date: 2015-09-02
WILL SEMICON (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above problems, the present invention aims to provide an open-loop charge pump circuit that increases the frequency of the output voltage ripple, which adds an output voltage ripp

Method used

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  • Open-loop charge pump circuit capable of increasing output voltage ripple frequency
  • Open-loop charge pump circuit capable of increasing output voltage ripple frequency
  • Open-loop charge pump circuit capable of increasing output voltage ripple frequency

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Embodiment Construction

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these drawings and obtain other implementations.

[0046] Such as image 3 Shown is the open-loop charge pump circuit provided by the present invention. It can be seen from the figure that the open-loop charge pump circuit includes: an overvoltage protection signal generation module 100, a working clock generation module 200, and a boost control signal generation module 300. , boost module 400 and output voltage ripple detection and control module 500, wherein, the input end of the overvoltage protection signal generation module 1...

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Abstract

The invention provides an open-loop charge pump circuit capable of increasing an output voltage ripple frequency. The open-loop charge pump circuit comprises an overvoltage protection signal generation module, a work clock generation module, a boost control signal generation module, a boost module and an output voltage ripple detection and control module, wherein an input end of the overvoltage protection signal generation module is connected with an output end of the boost module, and an output end is connected with an input end of the boost control signal generation module; an output end of the work clock generation module is connected with an input end of the boost control signal generation module; an output end of the boost control signal generation module is connected with an input end of the boost module; and an input end of the output voltage ripple detection and control module is connected with an output end of the overvoltage protection signal generation module, and an output end is connected with an output end of the boost module. According to the invention, the output voltage ripple detection and control module is added on the basis of an original open-loop charge pump circuit, so that the problems of low tone quality and the like, which are caused by a too low voltage ripple frequency, are solved.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an open-loop charge pump circuit. Background technique [0002] The charge pump boost circuit is the most common DC-DC (Direct Current, DC) boost power supply circuit for portable electronic devices. Compared with the inductive Boost boost circuit, the EMI (Electro Magnetic Interference, electromagnetic interference) of the charge pump boost circuit Interference) has better performance, which uses boosted pump capacitors to store energy, and controls the charge / discharge of the boost pump capacitors through the control circuit to achieve boost and transfer energy to output. [0003] Generally speaking, the charge pump booster circuit is divided into a closed-loop charge pump circuit and an open-loop charge pump circuit. The closed-loop charge pump circuit outputs a constant output voltage slightly lower than the boost multiple through loop control, while the constant ...

Claims

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Application Information

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IPC IPC(8): H02M3/07
Inventor 张振浩余维学仲志华尹辉胡颖
Owner WILL SEMICON (SHANGHAI) CO LTD
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