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Drive protection circuit of insulated gate bipolar transistor (IGBT)

A technology for driving protection circuits and driving chips, which is applied in the direction of electrical components, electronic switches, pulse technology, etc., can solve problems such as poor stability, heavy workload, and complex structure, and achieve the effect of ensuring reliability and preventing misoperation

Inactive Publication Date: 2013-02-13
SHENYANG CHUANGDA TECH TRADE MARKET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most used IGBT drive circuits are built from power electronic components, and the circuit has many components, complex structure and poor stability.
Once the circuit breaks down, many components need to be tested for maintenance, and the workload is heavy, which seriously affects the normal operation of the system

Method used

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  • Drive protection circuit of insulated gate bipolar transistor (IGBT)

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Embodiment Construction

[0009] The detailed structure of the present invention is illustrated in conjunction with examples.

[0010] The IGBT drive protection circuit diagram is shown in figure 1 As shown, the driver chip is VLA517-01R, the isolation optocoupler is HCPL2602, and the voltage limiting diode is 1N4733 and 1N4744.

[0011] After VLA517-01R receives the driving signal, when 10mA current flows through the input pins 15 and 14, the internal optocoupler is turned on, and the driving voltage of +15V output from pin 3 makes the IGBT turn on, the driving signal is cut off, and the optocoupler is turned off. 3 The pin outputs a reverse -5V voltage to turn off the IGBT. 1N4733 and 1N4744 limit the voltage input to the IGBT to a maximum of 15V and a minimum of -5V to reliably drive the IGBT on and off. When the system fails, VLA517-01R blocks the signal output of pin 3, and at the same time, the output fault signal is sent to the processor after being isolated by the optocoupler HCPL2602. Becau...

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Abstract

The invention relates to a drive protection circuit of an insulated gate bipolar transistor (IGBT) and belongs to the technical field of electric control. The drive protection circuit comprises a drive chip, an isolation optocoupler and voltage limiting diodes, wherein VLA517-01R is selected as the drive chip, HCPL2602 is selected as the isolation optocoupler, and IN4733 and IN4744 are selected as the voltage limiting diodes. The drive protection circuit has the advantages that the VLA517-01R is a special module which is provided for a system to fast drive the IGBT, delay time of the whole circuit doesn't exceed 1 mu s, the maximum operating frequency reaches 40-50 kHz, only a 20V power source is used for externally supplying power, positive drive voltage and reverse cut-off voltage can be internally generated, and an overcurrent protection and fault signal output circuit is arranged in the module.

Description

[0001] technical field [0002] The invention belongs to the technical field of electrical control, and in particular relates to an IGBT drive protection circuit. Background technique [0003] With the development of social industrialization, the application of insulated gate bipolar transistor (IGBT) is more and more extensive. At present, the IGBT driving circuits that are widely used are constructed of power electronic components. The circuit has many components and has a complex structure and poor stability. Once the circuit breaks down, many components need to be tested for maintenance, and the workload is heavy, which seriously affects the normal operation of the system. Contents of the invention [0004] Aiming at the deficiencies in the prior art, the invention provides an IGBT drive protection circuit. [0005] The technical scheme of the present invention is realized in the following way: it includes a driver chip, an isolated optocoupler and a voltage limit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/08
Inventor 李翠
Owner SHENYANG CHUANGDA TECH TRADE MARKET
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