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Multi-switch synchronous isolation driving circuit with over-current protection

A technology for isolating drive circuits and overcurrent protection, which is applied to emergency protection circuit devices, emergency protection circuit devices, and circuit devices for limiting overcurrent/overvoltage, and can solve the problem of reducing short-circuit withstand time and reducing IGBT impedance , short-circuit current increase and other problems, to achieve the effect of increasing the voltage amplitude, increasing the turn-off speed, and improving the ability of electromagnetic compatibility

Inactive Publication Date: 2019-04-16
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above relationship exists because as the saturated conduction voltage drop decreases, the impedance of the IGBT also decreases, and the short-circuit current increases at the same time. The power consumption during the short-circuit increases with the square of the current, resulting in a rapid decrease in the short-circuit withstand time.

Method used

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  • Multi-switch synchronous isolation driving circuit with over-current protection
  • Multi-switch synchronous isolation driving circuit with over-current protection
  • Multi-switch synchronous isolation driving circuit with over-current protection

Examples

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Embodiment 1

[0022] Such as figure 1 and figure 2 As shown, a multi-switch synchronous isolation drive circuit with overcurrent protection in this embodiment is used to synchronously drive a plurality of semiconductor switch tubes, including: a control circuit (not shown in the figure), a primary side drive circuit (in the figure not shown), the magnetic isolation transformer 10 and the secondary drive control circuit 20.

[0023] A control circuit for generating and outputting analog signals.

[0024] The primary side drive circuit is electrically connected with the control circuit and used for converting the analog signal into a bipolar pulse signal.

[0025] The primary side drive circuit is used to generate a bipolar pulse signal with adjustable pulse width, phase and frequency.

[0026] The magnetic isolation transformer 10 has a primary winding electrically connected to the primary driving circuit, a plurality of core-through magnetic rings connected in series with the primary wi...

Embodiment 2

[0038] This embodiment has a control circuit (not shown in the figure), a primary side drive circuit (not shown in the figure), a magnetic isolation transformer 10 and a secondary side drive control circuit. Compared with Embodiment 1, the overcurrent protection module 203 of this embodiment is different, and has the following structure:

[0039] Such as Figure 4 As shown, the overcurrent protection module 203 includes a semiconductor switch S1 whose gate is connected to one end of the energy storage capacitor Cq and whose emitter is connected to the other end of the energy storage capacitor Cq. One end is connected to the emitter of the semiconductor switch S1 and the other end is connected to the second end of the semiconductor switch S1. The drains of the two MOS transistors Q2 are connected to the sampling resistor Re and the bidirectional voltage regulator transistors Z1 and Z2 connected in parallel to the gate of the semiconductor switch S1 and the drain of the second M...

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Abstract

The invention provides a multi-switch synchronous isolation driving circuit with over-current protection, and the circuit is used for synchronously driving a plurality of semiconductor switch tubes. The circuit comprises a control circuit which is used for generating and outputting an analog signal; a primary side driving circuit which is electrically connected with the control circuit and is usedfor converting the analog signal into a bipolar pulse signal; a magnetic isolation transformer which is provided with a primary side winding electrically connected with the primary side driving circuit, a plurality of cross-core magnetic rings connected to the primary side winding in series in an isolation manner, and a secondary side winding wound on the cross-core magnetic rings, and is used for transmitting the bipolar pulse signal; a secondary side driving control circuit which is electrically connected with a secondary side winding of the magnetic isolation transformer and is used for receiving the bipolar pulse signal and generating an isolation driving signal, wherein the primary side driving circuit is used for generating the bipolar pulse signal with adjustable pulse width, phaseand frequency, and the secondary side driving control circuit comprises a driving module and an overcurrent protection module.

Description

technical field [0001] The invention belongs to the technical field of pulse power, and in particular relates to a multi-switch synchronous isolation drive circuit with overcurrent protection. Background technique [0002] IGBT has the advantages of low driving power, low conduction voltage, large current capacity, and high withstand voltage, and is currently the mainstream semiconductor switching device. However, the current flow and withstand voltage capability of a single switch tube is still limited. When high voltage or high current is required, multiple IGBT or MOSFET switch tubes are usually used in series or in parallel, so multiple switch tubes need to be driven synchronously. However, the working potentials of different switching tubes are different, so the driving signals of the switching tubes also need to be isolated. [0003] Common isolation drive schemes include magnetic isolation drive, optical fiber or optocoupler isolation drive. The cost of optical fibe...

Claims

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Application Information

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IPC IPC(8): H02H9/02H02M1/088
CPCH02H9/02H02M1/088
Inventor 饶俊峰吴改生姜松李孜曾彤
Owner UNIV OF SHANGHAI FOR SCI & TECH
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