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Isolated driving signal transmission circuit

A technology for driving signals and transmission circuits, applied in the field of isolated driving circuits, which can solve the problems that it is difficult to provide short delay and good CMTI performance

Pending Publication Date: 2019-08-20
厦门芯达茂微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still difficult to provide short delay and good CMTI performance with pulse transformer as the isolation medium

Method used

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  • Isolated driving signal transmission circuit
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Embodiment Construction

[0084] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0085] Such as figure 1 As shown, the circuit block diagram of an embodiment of the isolated driving signal transmission circuit of the present invention, wherein the isolated driving signal transmission circuit of the present invention can be applied in a gate driving device to receive and transmit from a main control An input signal of the chip, such as an IGBT driving signal. Such as figure 1 As shown, an isolated drive signal transmission circuit 1 uses an internal input signal receiving module 11 to perform dual-carrier modulation processing on the input signal to generate a differential signal, and then uses an internal isolation medium 12 to transmit the differential signal to an output signal providing module 13...

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Abstract

The invention provides an isolated driving signal transmission circuit which comprises an input signal receiving module which is coupled between a first power supply and a first ground end and is usedfor receiving an input signal, carrying out dual-carrier modulation processing on the input signal and outputting a differential signal, and an output module which is coupled between the first powersupply and a second ground end and is used for outputting a differential signal; a high-voltage capacitor serving as an isolation medium and being coupled with the input signal receiving module to receive the differential signal; and an output signal providing module coupled between a second power supply and a second ground end, coupled with the high-voltage capacitor at the same time, used for receiving the differential signal through the high-voltage capacitor, and providing an output signal after carrying out dual-carrier demodulation processing on the differential signal.

Description

technical field [0001] The present invention relates to an isolated driving circuit, in particular to an isolated driving signal transmission circuit applied in a gate driving device. Background technique [0002] Insulated Gate Bipolar Transistor (IGBT) is a kind of semiconductor device, which is mainly used for drive control of motors such as electric vehicles, electric locomotives, and air conditioners. In a closed-loop control system, the main control chip of the system generates an IGBT driving signal correspondingly according to the output voltage (current) signal, and the IGBT driving signal is transmitted to the IGBT device through the IGBT gate driver. Therefore, the IGBT gate driver is an electronic chip used to transmit the driving signal to the IGBT device [0003] Commercially available IGBT gate driver chips include isolation media for isolation between a signal receiving circuit and an output circuit inside the IGBT gate driver chip. At present, commonly use...

Claims

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Application Information

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IPC IPC(8): H03K17/081H03K17/567H02M3/28
CPCH03K17/08116H03K17/567H02M3/28
Inventor 秦海怡王燕晖
Owner 厦门芯达茂微电子有限公司
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