CN2196820Y

CN2196820Y - Silicon controlled rectifier capable of being cut-off

Info

Publication number: CN2196820Y
Application number: CN 94204295
Authority: CN
Inventors: 许正山
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-03-07
Filing date: 1994-03-07
Publication date: 1995-05-10
Anticipated expiration: 2004-03-07

Abstract

The utility model relates to a silicon controlled rectifier which can be switched off. The utility model belongs to a semiconductor element, especially the silicon controlled rectifier which can be switched off. On the basis of a normal unidirectional silicon controlled rectifier, a switching off control pole is led out from the base region without a control pole, when the utility model is used, the switching off control pole and a positive pole are just needed to be switched on, and the silicon controlled rectifier which is switched into conduction can be switched off. The utility model with simple structure, low cost and easy switching off control is especially suitable for using under the condition of direct current high voltage and high electric current, and meanwhile, the utility model also has the application area of the unidirectional silicon controlled rectifier.

Description

Silicon controlled rectifier capable of being cut-off

The utility model relates to a kind of semiconductor element, particularly the controllable silicon that can turn-off.

After the existing controllable silicon conducting, as long as its both positive and negative polarity exists forward voltage poor, it is impossible making its shutoff.Yet in silicon controlled is used, often have to make its requirement of turn-offing at work, produced the contrary type turn-off SCR of leading for reaching this purpose.The diffusion to the control utmost point when making of this controllable silicon requires quite strictness, causes the finished product rate very low; Desire to make its shutoff in actual applications, must add the high peak negative pulse at the control utmost point, this needs a complicated cover control circuit; It only should the current applications below 20A use, if electric current is excessive, then can causes and turn-off failure, has limited the contrary type controllable silicon application in a lot of fields of leading.

The purpose of this utility model provides a kind of controllable silicon that can the shutoff type, and it is simple in structure, easy to manufacture, cost is low, control is easy, can suit working under big electric current.

Implementation of the present utility model is: adopt ripe controllable silicon manufacturing process, draw one again and turn-off the control utmost point in the base of the nothing control utmost point of the one-way SCR of routine, thereby the finished product rate is improved, designs simplification, cost reduce.

Below, the embodiment of the present utility model according to shown in the Figure of description is further described its structure.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is a circuit diagram of the present utility model;

Fig. 3 is circuit symbol figure of the present utility model.

Referring to each figure, conventional one-way SCR has only control utmost point G1, but its A end adds positive voltage, the K end adds negative voltage, when G1 adds a positive signal, controllable silicon is conducting then, can keep conducting even the positive signal voltage at G1 place no longer exists still, and the voltage that has only A, K end could turn-off during less than the voltage of keeping controllable silicon work.The utility model is on the architecture basics of existing one-way SCR, has drawn one and has turn-offed control utmost point G2 in (N district) from first base, the controllable silicon of for positive conducting only needs shutoff control utmost point G2 and silicon controlled anode A are connected, the turn-on condition of PNP triode is destroyed, and controllable silicon also just ends.Being switched on or switched off of silicon controlled control utmost point G2 and silicon controlled anode A is to adopt switch to realize.In the present embodiment, can be with a triode BG as electronic switch.When the conducting of needs controllable silicon, the base stage of triode BG does not have positive voltage signal, is in cut-off state, makes the silicon controlled anode and turn-offs the disconnection of the control utmost point; When the needs controllable silicon ends, add that in the base stage of BG a positive voltage signal makes its conducting, make the silicon controlled anode and turn-off the control utmost point and connect.

By such scheme of the present utility model, following effect is arranged:

1, easy to manufacture, yield rate is high, cost is low. Only need to use ripe controllable silicon manufacturing process, draw again one from first base and turn-off the control utmost point, also do not have in the mill special requirement;

2, operating current and voltage range are big. Owing to the structure of existing one-way SCR is not done big improvement, so it has still possessed the performance of working of suiting of one-way SCR under big electric current and high voltage, its operating current can reach more than the 1200A;

3, control is simple.Need not very complicated control circuit, as long as be switched on or switched off turn-offing the control utmost point and anode.

Claims

1, a kind of turn-off SCR is characterized in that drawing one again in the base of the nothing control utmost point of the one-way SCR of routine turn-offs the control utmost point.

2,, it is characterized in that being connected to switch at silicon controlled anode and shutoff interpolar by the described turn-off SCR of claim 1.