CN202602606U

CN202602606U - Strong constant current high-voltage thyristor trigger circuit

Info

Publication number: CN202602606U
Application number: CN 201220210921
Authority: CN
Inventors: 宁国云; 李荣朋; 李鹏; 王丽伟; 王怡华
Original assignee: DAYU ELECTRICAL TECHNOLOGY Co Ltd
Current assignee: DAYU ELECTRICAL TECHNOLOGY Co Ltd
Priority date: 2012-05-11
Filing date: 2012-05-11
Publication date: 2012-12-12
Anticipated expiration: 2022-05-11

Abstract

The utility model relates to a strong constant current high-voltage thyristor trigger circuit. The circuit comprises a power frequency transformer, a Buck constant current circuit, a strong impulse current generator, a trigger pulse inductor, a thyristor assembly and a signal trigger. The power frequency transformer is in series connection with the Buck constant current circuit. The Buck constant current circuit is in series connection with the strong impulse current generator. The strong impulse current generator is in series connection with the trigger pulse inductor. The trigger pulse inductor is in series connection with the thyristor assembly. The strong impulse current generator is connected with the signal trigger. The trigger pulse inductor comprises a high-voltage cable and a high-frequency pulse magnet ring. The high-voltage cable passes through the high-frequency pulse magnet ring. The beneficial effects of the strong constant current high-voltage thyristor trigger circuit are that the trigger circuit is short in response time, so that a leading edge steepness of a trigger pulse signal is guaranteed and false triggering is not liable to occur; and the high-frequency pulse magnet ring and the high-voltage cable in the trigger pulse inductor are positioned on the same level, so that corona is not liable to occur and the thyristor trigger circuit can work in a safer and more reliable manner.

Description

A kind of strong constant flow high pressure thyristor gating circuit

Technical field

The utility model belongs to electric and electronic technical field, relates in particular to a kind of circuits for triggering of strong constant flow high pressure thyristor.

Background technology

Along with the development of power electronics industry and the promotion of industrial requirement, the power equipment application scenario of high-voltage large current is more and more, and the power semiconductor switch series connection that this kind equipment is lower with a plurality of voltage withstand class is usually used, to reach higher withstand voltage purpose; Thyristor often is used because its capacity is big, control technology is ripe, reliability is high, cost is low, and therefore the synchronous conducting and the high-grade voltage isolation of a plurality of thyristors are key technical problems.

Triggering mode commonly used at present has several kinds of forms: light triggers, photoelectricity triggering etc.It is to adopt light directly to trigger thyristor that light triggers, and this mode electrical isolation effect is better, but this thyristor does not also get into the practical applications stage at present, and cost is higher; It is to cooperate optical fiber to realize the triggering of thyristor through optical-electrical converter that photoelectricity triggers, this mode electrical isolation effect might as well, also comparative maturity at present; Shortcoming is that every pair of thyristor need be used a pair of optical fiber, needs to cooperate high power strong trigger impulse transformer to use; Cost is high, and the fault point is high.

The utility model content

The purpose of the utility model provides a kind of strong constant flow high pressure thyristor gating circuit, and existing triggering mode cost is high to solve, the problem of poor reliability.

The purpose of the utility model is to realize through following technical scheme:

A kind of strong constant flow high pressure thyristor gating circuit; Comprise Industrial Frequency Transformer, Buck constant-current circuit, hard pulse current feedback circuit, trigger impulse inductor, thyristor assembly and signal trigger; It is characterized in that: said Industrial Frequency Transformer is connected with the Buck constant-current circuit; Said Buck constant-current circuit is connected with the hard pulse current feedback circuit; Said hard pulse current feedback circuit is connected with the trigger impulse inductor, and said trigger impulse inductor is connected with the thyristor assembly, and said hard pulse current feedback circuit is connected with signal trigger.

Further, said trigger impulse inductor comprises high-tension cable and high-frequency impulse magnet ring, and said high-tension cable passes the high-frequency impulse magnet ring.

The beneficial effect of the utility model is:

When the triggering signal of 1, sending when signal trigger arrived, the hard pulse current feedback circuit was the high frequency alternating current with the Constant Direct Current current conversion that the Buck circuit produces fast, and the response time is short, has guaranteed the leading-edge steepness of start pulse signal, is not prone to false triggering;

2, high-frequency impulse magnet ring in the trigger impulse inductor and high-tension cable are in same current potential, are difficult for producing corona, and wherein, high voltage cable is directly not strong to be triggered, and can anticoronaly puncture, and makes that thyristor gating circuit work is more safe and reliable.

Description of drawings

According to accompanying drawing the utility model is done further explain below.

Fig. 1 is the circuit theory diagrams of the described a kind of strong constant flow high pressure thyristor gating circuit of the utility model embodiment.

Fig. 2 is that the high-tension cable in the described a kind of strong constant flow high pressure thyristor gating circuit of the utility model embodiment partly is connected sketch map with the trigger impulse inductor.

Among the figure:

1, Industrial Frequency Transformer; 2, Buck constant-current circuit; 3, hard pulse current feedback circuit; 4, trigger impulse inductor; 5, thyristor assembly; 6, signal trigger; 41, high-tension cable; 42, high-frequency impulse magnet ring.

Embodiment

Shown in Fig. 1-2; The described a kind of strong constant flow high pressure thyristor gating circuit of the utility model embodiment; Comprise Industrial Frequency Transformer 1, Buck constant-current circuit 2, hard pulse current feedback circuit 3, trigger impulse inductor 4, thyristor assembly 5 and signal trigger 6; Said Industrial Frequency Transformer 1 is connected with Buck constant-current circuit 2, and said Buck constant-current circuit 2 is connected with hard pulse current feedback circuit 3, and said hard pulse current feedback circuit 3 is connected with trigger impulse inductor 4; Said trigger impulse inductor 4 is connected with thyristor assembly 5, and said hard pulse current feedback circuit 3 is connected with signal trigger 6; Said trigger impulse inductor 4 comprises high-tension cable 41 and high-frequency impulse magnet ring 42, and said high-tension cable 41 passes high-frequency impulse magnet ring 42.

During concrete the use; Industrial Frequency Transformer 1 is composed in series strong constant-current supply with Buck constant-current circuit 2; When the triggering signal of sending when signal trigger 6 arrived, the direct current that strong constant-current supply is provided became high-frequency ac current through hard pulse current feedback circuit 3, when on the high-tension cable 41 during through high-frequency ac current; Secondary coil on the high-frequency impulse magnet ring 42 obtains by the next alternating signal of high-tension cable coupling; Remove the negative half period pulse after the conversion, only stay the signal pulse of positive half cycle, and then conducting thyristor assembly 5; When the triggering signal that do not have signal trigger 6 to send, the dc current signal of hard pulse current feedback circuit 3 output constant amplitude responds during the triggering signal arrival that could guarantee like this to send when signal trigger 6 fast, reduces to delay time.

The utility model is not limited to above-mentioned preferred forms; Can not limit to the utility model with this; Other various forms of products that anyone draws under the enlightenment of the utility model; No matter on its shape or structure, do any variation, every have identical with a application or akin technical scheme, all drops within the protection range of the utility model.

Claims

1. one kind strong constant flow high pressure thyristor gating circuit; Comprise Industrial Frequency Transformer (1), Buck constant-current circuit (2), hard pulse current feedback circuit (3), trigger impulse inductor (4), thyristor assembly (5) and signal trigger (6); It is characterized in that: said Industrial Frequency Transformer (1) is connected with Buck constant-current circuit (2); Said Buck constant-current circuit (2) is connected with hard pulse current feedback circuit (3); Said hard pulse current feedback circuit (3) is connected with trigger impulse inductor (4), and said trigger impulse inductor (4) is connected with thyristor assembly (5), and said hard pulse current feedback circuit (3) is connected with signal trigger (6).

2. a kind of strong constant flow high pressure thyristor gating circuit according to claim 1 is characterized in that: said trigger impulse inductor (4) comprises high-tension cable (41) and high-frequency impulse magnet ring (42), and said high-tension cable (41) passes high-frequency impulse magnet ring (42).