Gate commutated thyristor chip applied to hybrid direct-current circuit breakers

Abstract

The invention relates to a gate commutated thyristor chip applied to hybrid direct-current circuit breakers, and belongs to the technical field of semiconductor integrated chips. The gate commutated thyristor chip comprises a cathode metal electrode, gate metal electrodes and an anode metal electrode. A cathode, gates and an anode are connected with external driving circuits by the metal electrodes; a cathode plane of the chip comprises a plurality of concentric cathode rings, a concentric gate contact ring and a plurality of cathode combs; p-type base regions of cells of the combs on the same cathode ring have identical depths, and the depths of p-type base regions of cells on the combs on the different cathode rings can be adjusted according to the distances from the cathode rings to the gate contact ring; the depths of p-type base regions of cells of the combs on the cathode rings are increased along with increase of the distance from the cathode rings to the gate contact ring. The sums of the depths of the p-type base regions of the cells of the combs on the different cathode rings and the depths of n-type base regions are identical to one another. The gate commutated thyristor chip has the advantages that the problem of unbalanced commutation time due to existing unbalanced inductance distribution can be solved by the aid of the chip, and the current turn-off ability of each large-diameter IGCT (integrated gate commutated thyristor) can be improved.

Description

technical field [0001] The invention belongs to the technical field of semiconductor integrated circuits, and in particular relates to a structure of a semiconductor device, in particular to a gate structure of an integrated gate commutation thyristor used in a natural commutation hybrid DC circuit breaker. Background technique [0002] In the field of DC power transmission and distribution, with the development of power electronic devices and the birth of high-power devices such as GTO, IGBT, IGCT, and ETO, the hybrid DC circuit breaker based on power electronic technology has become an important technology for quickly breaking DC current. plan. The structure of natural commutation hybrid DC circuit breaker is as follows: figure 1 As shown, there are three branches including main current branch, main circuit breaker branch, overvoltage limiting and energy absorbing branch. Current flows through the main current branch in the normal conduction state. When a fault occurs, ...

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Problems solved by technology

[0021] The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a gate commutation thyristor chip applied to a hybrid DC circuit breaker. To solve the problem of time imbalance, improve the current turn-off capability of large-diameter IGCTs

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