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Method for driving IGBT in PDP display screen line driving chip

A DO2, intermediate result technology, applied in static indicators, instruments, etc., can solve problems such as the inability to reduce simultaneous opening time

Inactive Publication Date: 2011-12-07
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve this problem, most of the methods currently used are to control the turn-on time of the upper IGBT (fix the turn-on time through the RC circuit). In the conversion to "1", the upper and lower tubes are turned on at the same time, but the simultaneous on time of the "1" to "0" conversion cannot be reduced, that is, the time when the upper tube is closed and the lower tube is turned on

Method used

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  • Method for driving IGBT in PDP display screen line driving chip
  • Method for driving IGBT in PDP display screen line driving chip
  • Method for driving IGBT in PDP display screen line driving chip

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Embodiment Construction

[0016] The invention proposes a new method for setting the IGBT turn-on and turn-off time in a digital manner. The method can improve the reliability of the whole chip on the one hand and reduce the power consumption of the system on the other hand.

[0017] In the present invention, by extracting the DI signal for controlling the IGBT, the DI signal is respectively processed into a turn-on signal, a turn-off signal of the upper IGBT tube, and a control signal of the lower IGBT tube. In the following processing, it is assumed that when DI is logic level 1, the upper IGBT turns on and outputs a high voltage, and when DI is logic level 0, the lower IGBT turns on and pulls the output level down to the system ground potential (depending on the situation, it can also be that DI is logic level When the level is 0, the upper IGBT turns on and outputs a high voltage, and when DI is logic level 1, the lower IGBT turns on and pulls the output level down to the system ground potential.) ...

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Abstract

The present invention discloses a method for controlling turn-on / turn-off of IGBT. The method comprises the following steps that: the latched IGBT controls a signal DI; DI produces intermediate signals COUNT 1, COUNT_A, COUNT 2 and COUNT_B, and DO1=COUNT_A&DI, DO3=COUNT_B&(!DI), and DO2=!D1 are obtained from the intermediate signals; and DO1, DO2 and DO3 are used for driving the on and the off of the IGBT. The method fully prevents the simultaneously on status when the output high level and low level are changed caused by different on and off time of the IGBT, thereby not only improving the product reliability, but also reducing the power consumption of a system.

Description

technical field [0001] The invention relates to the row driving technology of a PDP display screen, and specifically proposes a method for driving an IGBT in a row driving chip. Background technique [0002] figure 1 It is a typical output drive output circuit diagram of PDP, in which DO1, DO2, P1, P2, N1, N1 form a typical level shift circuit, R1, D1 form the drive circuit of IGBT1, and DO3 signal directly drives IGBT2. In the row drive chip of the PDP display screen, the row drive signal needs to be connected to the Y drive electrode of the PDP screen to realize switching between high and low output levels and high-impedance input states, and the switching process of the high and low level circuits is through the input The "0", "1" conversion and level shift of the data are realized by controlling the switch of the upper and lower IGBTs. Since the electrical characteristics of the IGBT determine its fast turn-on speed and slow turn-off speed, when the input data "0" and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/28G09G3/288
Inventor 黄光佐
Owner SICHUAN CHANGHONG ELECTRIC CO LTD