IGBT driving circuit embedded with isolating source

A technology for driving circuits and isolating power supplies. It is applied in electrical components, electronic switches, and conversion equipment with intermediate conversion to AC. It can solve the problems of large transmission delay time, limited optocoupler isolation voltage tolerance, driving signal frequency and duty cycle. Limitations and other issues, to achieve the effect of short transmission delay time, good applicability and perfect performance

Active Publication Date: 2010-02-03
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Optocoupler isolation voltage tolerance is limited, there is a large transmission delay time; using a pulse transformer to directly drive the circuit, the transmission speed has been greatly improved, but the frequency and duty cycle of the driving signal are limited

Method used

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  • IGBT driving circuit embedded with isolating source
  • IGBT driving circuit embedded with isolating source
  • IGBT driving circuit embedded with isolating source

Examples

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Embodiment Construction

[0029] The basic idea of ​​the present invention is that the internal integrated isolated DC / DC power supply provides positive and negative output voltages to provide energy for the IGBT drive circuit.

[0030] In order to facilitate a deep understanding of the present invention, the following will be described in detail in conjunction with the accompanying drawings and embodiments.

[0031] see figure 1 , the IGBT drive circuit with built-in isolated power supply in the present invention includes two parts: a power supply circuit 100 and a drive circuit 200, wherein,

[0032] The power supply circuit 100 includes in turn:

[0033] The oscillation circuit 101 generates a push-pull drive signal when the power supply is input;

[0034] The push-pull conversion circuit 102 includes at least one pair of switch tubes, which are alternately turned on / off according to the push-pull drive signal to realize energy conversion;

[0035] Fixed turns ratio power transformer T1, which tr...

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PUM

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Abstract

The invention discloses an IGBT driving circuit embedded with an isolating source, comprising a power supply circuit and a driving circuit; wherein the power supply circuit sequentially comprises an oscillating circuit in charge of producing a push-pull driving signal, a transforming circuit which comprises at least one pair of switch tube and realizes energy transformation by alternate on/off according to the push-pull driving signal, a power transformer in charge of transmitting energy from the primary winding thereof to the secondary winding and a rectifying filtering circuit in charge of independent rectifying filtering on the secondary winding of the power transformer in two paths, wherein a common terminal is led out to realize positive and negative power supply output, so as to supply power to the driving circuit. A high-efficiency DC/DC isolating converter and the IGBT driving circuit are integrated, thus saving an outdoor isolating source and being convenient for application of a driver; and the invention is easy to be realized by adopting hybrid integrated thick film circuit, thus being beneficial to adopting SIP encapsulation and saving PCB area.

Description

technical field [0001] The invention relates to a hybrid integrated IGBT driving circuit, in particular to an IGBT driving circuit with a built-in isolated power supply. Background technique [0002] Insulated gate bipolar transistor (IGBT) has high current capacity and voltage capacity, high switching frequency, low conduction saturation voltage, high input impedance, simple driving, and is widely used in medium and high power conversion systems. As a bridge between the control circuit and the power circuit, the drive circuit plays a vital role in fully utilizing the performance of the IGBT and improving the reliability and stability of the power system. The function of the IGBT drive circuit is to isolate and convert the control signal from the controller into a drive signal with sufficient power to ensure the reliable turn-on and turn-off of the IGBT. At the same time, the IGBT drive circuit also provides safe electrical isolation between the controller and the power tub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/567H02M3/28H03K17/08
Inventor 尹向阳
Owner MORNSUN GUANGZHOU SCI & TECH
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