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Drive of insulated gate power tube

An insulated gate and driver technology, applied in electrical components, pulse technology, electronic switches, etc., can solve problems such as no gate voltage drop, short-term IGBT overcurrent, etc.

Active Publication Date: 2014-12-31
BEIJING LMY ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fourth, during the working process of the IGBT, various random interference signals may cause the IGBT to over-current for a short time, and this over-current does not need to turn off the IGBT
[0003] The finished IGBT drivers currently on the market, such as VLA517, M57962, KA962, etc., generally have a soft turn-off function, but do not have a gate voltage reduction function.

Method used

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Examples

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Embodiment Construction

[0079] The following is attached Figure 22 The non-limiting examples of the present invention are further described in detail, which is helpful for the understanding of the present invention.

[0080] The entire drive consists of cells (A-I). The specific circuits used by each unit are as follows: isolated input unit (A1), interface unit (B2), positive and negative power supply distribution unit (C1), drive output unit (D1), overcurrent detection unit (E2), grid voltage drop unit (F1), a delay judgment unit (G2), a soft shutdown unit (H2) and a short circuit alarm unit (I2). The driver has 8 terminals in total. Terminals 1 (Vcc) and 2 (Vee) are single-voltage power supply input terminals connected to external power supply Vp; terminal 3 (Vi) is the PWM signal input terminal, and terminal 4 (Com) is the common terminal of the input signal , the signal of the external control board is input here; terminal 5 (Detect) is the detection signal input terminal, connected to the coll...

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Abstract

Provided is a drive of an insulated gate power tube. The drive is composed of nine units: an isolated input unit (A), an interface unit (B), a positive and negative power supply distribution unit (C), a driving output unit (D), an overcurrent detection unit (E), a gate voltage reducing unit (F), a delay judgment unit (G), a soft turn-off unit (H) and a short circuit alarming unit (I). The drive is characterized in that single power supply is adopted, positive voltage is connected and positive voltage is disconnected when the drive is in normal work, the drive has soft turn-off, signal blocking, gate voltage reducing and delay judgment functions when performing protection, and therefore the drive has perfect protection effect for an insulated gate bipolar translator (IGBT).

Description

technical field [0001] The invention belongs to the technical field of driving power tubes in switching power supplies, in particular to the isolation driving and protection of insulated gate power devices (MOSFET, IGBT or other gate isolation devices, hereinafter referred to as IGBT). Background technique [0002] The design of high-power device drive circuit (driver) in switching power supply has always been one of the key technologies in the field of power supply. At present, in the field of power electronics, the power level of the switching power supply is moving towards two directions of micro power and super power. Whether the IGBT in a high-power switching power supply can work reliably is directly related to whether the design of its drive protection circuit is perfect. An ideal driver, first of all, can provide a positive voltage of about 15V when the IGBT is turned on, so that the IGBT is fully saturated and reduces its conduction loss; when it is turned off, it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/567
Inventor 陈坷陈亚宁
Owner BEIJING LMY ELECTRONICS
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