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Control circuit for voltage generator

A technology for voltage generators and control circuits, applied to instruments, electrical components, static indicators, etc.

Active Publication Date: 2021-11-30
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no control circuit that can be applied to various types of voltage generators at the same time, so as to be applied to different display screens

Method used

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  • Control circuit for voltage generator
  • Control circuit for voltage generator
  • Control circuit for voltage generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] Please refer to Figure 1A and 1B , Figure 1A and 1B They are schematic diagrams of a negative charge pump (Negative Charge pump, NCP) 10 and a positive charge pump (Positive Charge Pump, PCP) 11 respectively. Such as Figure 1A As shown, the negative charge pump 10 can receive an oscillation signal LX and a control signal VCTRL to generate a negative output voltage VNEG. The negative charge pump 10 can be composed of an N-type Metal Oxide Semiconductor Transistor (N-type Metal Oxide Semiconductor Transistor, NMOS Transistor) M1 and several capacitors and diodes. The output voltage VNEG can be generated according to the oscillation of the oscillation signal LX. The control signal VCTRL can control the on-resistance of the NMOSFET M1 to adjust the output voltage VNEG.

[0047] Such as Figure 1B As shown, the positive charge pump 11 can receive an input voltage VIN, an oscillation signal LX and a control signal VCTRL to generate a positive output voltage VPOS, and t...

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PUM

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Abstract

Disclosed is a control circuit for a voltage generator for at least one voltage generator that includes a first transistor, a first controller, a second transistor, a second controller and a communicator. The first transistor is coupled to a first output terminal of the at least one voltage generator. The first controller is coupled to a control terminal of the first transistor. The second transistor is coupled to a second output terminal of the at least one voltage generator. The second controller is coupled to a control terminal of the second transistor. The communicator, coupled between the first controller and the second controller, is configured to selectively control the first controller and the second controller to communicate with each other or not according to the at least one voltage generator.

Description

technical field [0001] The present invention relates to a control circuit applicable to at least one voltage generator, and more particularly to a control circuit used to supply voltage to at least one voltage generator of a display screen. Background technique [0002] Liquid Crystal Display (LCD) panels generally require stable positive and negative voltages to operate. The positive voltage is generally provided by a buck converter, boost converter or positive charge pump (Positive Charge Pump, PCP); the negative voltage is generally provided by an inverting buck-boost converter (inverting buck-boost converter) or negative charge pump (Negative Charge pump, NCP). Depending on the size and / or resolution of the panel, different types of voltage generators may be used. For example, a panel with a larger size and / or higher resolution usually has a larger load. Therefore, a boost converter and an inverting buck-boost converter can be used to cope with the huge load of the pan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/3696H02M1/009G09G2300/0426H02M3/158H02M3/1584H02M3/07H02M1/0003H02M3/071
Inventor 谢俊禹
Owner NOVATEK MICROELECTRONICS CORP