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Voltage regulation type charge pump

A voltage regulation circuit and voltage regulation technology are applied in the field of charge pumps to achieve the effect of solving stability problems

Inactive Publication Date: 2009-09-23
HIMAX ANALOGIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, even if the required charge pump is designed, the charge pump may have stability issues

Method used

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  • Voltage regulation type charge pump

Examples

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Embodiment Construction

[0014] figure 1 is a schematic diagram illustrating a voltage-regulated charge pump according to an embodiment of the present invention. The voltage regulated charge pump 100 is a negative charge pump and includes a charge pump circuit 110 for receiving an input voltage V IN while generating an output voltage V neg . The charge pump circuit 110 includes a capacitor C1 , a first switch 112 , a second switch 114 , a first operational amplifier 116 and a second operational amplifier 118 . The first switch 112 is coupled to the input voltage V IN and between the first terminal of the capacitor C1, and the second switch 114 is coupled to the first terminal of the capacitor C1. The first operational amplifier 116 is coupled to the input voltage V IN and the ground terminal GND for receiving the timing signal CLK to control the first switch 112 . The second operational amplifier 118 is coupled to the input voltage V IN and the ground terminal GND for receiving the timing signa...

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Abstract

The invention relates to a voltage regulation type charge pump, which comprises a charge pump circuit used for receiving an input voltage so as to generate an output voltage, wherein the charge pump circuit comprises a capacitor, a first switch and a second switch. The first switch is coupled between the input voltage and the first end of the capacitor, while the second switch is coupled to the first end of the capacitor, wherein the first switch and the second switch are alternately turned on for allowing the capacitor to be charged to generate the output voltage. The voltage regulation type charge pump also comprises a third switch and a voltage regulation circuit. The third switch is coupled to the charge pump circuit, while the voltage regulation circuit is provided with an input end and an output end, wherein the input end is used for receiving the output voltage, and the output end is coupled to the third switch. The voltage regulation circuit is used for controlling the third switch to regulate the output voltage generated by the charge pump circuit.

Description

technical field [0001] The present invention relates to a charge pump, and more particularly to a voltage-regulated negative charge pump. Background technique [0002] As far as the general charge pump is concerned, it uses the charge storage capacity of the capacitor to generate an output voltage that is twice or three times the power supply voltage. However, for a gate driver in a liquid crystal display (LCD), the bias voltages (such as Vgh and Vgl) used to activate the gate driver must be more precise, so that the gate driver can drive the display panel more accurately on the scanline. Therefore, it is necessary to provide a charge pump with voltage regulation capability to generate an adjustable output voltage to start the gate driver. [0003] For this purpose, a voltage-regulated charge pump that uses an error amplifier to regulate the output voltage is thus produced, hoping to obtain a more accurate bias voltage to start the gate driver. However, since the size of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
Inventor 薛经纬吴清逸
Owner HIMAX ANALOGIC INC
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