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Light-operated thyristor and trigger control system thereof

A technology of light-controlled thyristors and thyristors, which is applied in the direction of thyristors, semiconductor/solid-state device manufacturing, electrical components, etc., can solve problems affecting device performance, device withstand voltage performance degradation, etc., and achieve the effect of small size and fast conduction

Pending Publication Date: 2019-09-13
LANZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And when the junction J2 is designed on the silicon surface of the light-controlled thyristor, although the light can be directly irradiated on the junction J2, the thyristor can be turned on faster when the power required by the light trigger device is small, but the device The design of the middle junction J2 on the surface of the device will seriously affect the performance of the device. Under the forward voltage drop of the thyristor, the J2 junction mainly bears the voltage drop, but designing the junction J2 on the surface of the device will undoubtedly make the device’s endurance The pressure performance is greatly reduced

Method used

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  • Light-operated thyristor and trigger control system thereof
  • Light-operated thyristor and trigger control system thereof
  • Light-operated thyristor and trigger control system thereof

Examples

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Embodiment 1

[0018] Example 1, such as Figure 1 to Figure 3 As shown, an optically controlled thyristor of the present invention includes an optically controlled thyristor chip, and the optically controlled thyristor chip includes a thyristor and an LED device for a light trigger signal, wherein the cathode structure includes a non-ohmic contact type photogenerated carrier semiconductor region In the current collection area in contact with ohms, the short-circuit area is surrounded by the non-short-circuit area. This design can reduce the area of ​​the control electrode on the cathode surface. The cathode not only undertakes the role of current collection, but also undertakes the conduction of the control electrode to the device. effect. The invention improves the structure of the cathode, so that the cathode can be used as a current collection area, and there is a semiconductor area not covered by metal, and light irradiation with a suitable wavelength will generate photocarriers on the ...

Embodiment 2

[0021] Example 2, such as Figure 4 As shown, an optical thyristor trigger control system of the present invention includes the optical thyristor described in Embodiment 1, and also includes an LED device for generating an optical trigger signal. The LED device is triggered by a pulse signal. When the When the photo-controlled thyristor needs to be forward-conducting, a pulse will cause the LED device to emit light, directly irradiating the surface where the cathode of the photo-controlled thyristor is located to make it conduct, wherein the control circuit can be realized by FPGA. The overall structure is compact and saves volume.

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Abstract

The invention relates to a light-operated thyristor and a trigger control system thereof. The light-operated thyristor has a cathode short circuit point and has cathode n+ regions connected together so that the [alpha]2 value is not reduced while improving the dv / dt characteristic of a device. Therefore, when the sum of [alpha]1 and [alpha]2 approaches 1 infinitely and [alpha]2 is not reduced, thedevice is irradiated by light with a wavelength suitable for absorption of silicon, and receives sufficient light intensity to complete conduction. The light-operated thyristor has high voltage and the large current, and can be rapidly conducted. In addition, the light-operated thyristor trigger control system has a small size.

Description

technical field [0001] The invention relates to the field of semiconductors, in particular to a light-controlled thyristor and a trigger control system thereof. Background technique [0002] At present, the maximum voltage and maximum current of the thyristors in the prior art are the highest among existing semiconductor devices during normal operation, and they can operate stably and reliably in the working circuit, so they are widely used in industrial control occasions with large capacity and power . However, the thyristor is triggered by an electrical signal, which leads to non-insulation and mutual interference between the main circuit and the control circuit. Therefore, it is proposed to replace the electrical signal with an optical signal, which is a light-controlled thyristor (also known as a light-controlled thyristor). Optically controlled thyristors use laser diodes or light-emitting diodes as light sources. The dv / dt of optically controlled thyristors and short...

Claims

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Application Information

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IPC IPC(8): H01L29/74H01L29/06H01L21/332
CPCH01L29/66363H01L29/0603H01L29/0684H01L29/74
Inventor 杨建红师楷尹晋超郭小星王红侠陈豪翔许炎周明
Owner LANZHOU UNIVERSITY