A variable period cycle controller for triggering a thyristor

Abstract

The invention discloses a variable period cycle controller for triggering thyristors, which comprises a case and further comprises a V-F converter circuit, an R-S trigger circuit, a two-way frequencydivider circuit, a pulse stretcher circuit, a zero-crossing pulse inverter circuit, a trigger board circuit, a signal conversion circuit, a power supply circuit and a terminal strip. The invention discloses a variable period cycle controller for triggering a thyristor. the number of output cycles can be changed to realize the function of continuously adjusting the output power; meanwhile, the temperature control is more accurate; temperature fluctuation is small, the variable-period cyclic waves are controlled at intervals in a minimum period; the sine wave zero-crossing trigger is adopted, the thyristor outputs complete sine waves, the radiation interference, conduction interference and transient surge of load current of the thyristor are minimum, and under the operation mode, the triggerboard circuit emits a series of pulse sequences when the sine wave zero-crossing occurs, so that the thyristor can be conducted quickly and is not prone to damage.

Description

technical field [0001] The invention relates to a controller, in particular to a variable-period cycle controller for triggering a thyristor. Background technique [0002] With the widespread use of power electronic components, thyristor components are commonly used in temperature control to achieve the purpose of controlling and adjusting temperature, and thyristors must use corresponding trigger circuits to ensure that the equipment works according to the control requirements. On the one hand, the thyristor trigger control modes are mainly: zero-crossing trigger and phase-shift triggering. In practical applications, since large-scale thyristor equipment adopts phase-shift triggering compared with zero-crossing triggering, it is easier to generate a large number of harmonic sources, which seriously pollutes the power grid. Quality, so zero-crossing trigger is widely used: zero-crossing conduction and zero-crossing cut-off, because the thyristor generates a lot of heat durin...

AI Technical Summary

Problems solved by technology

[0002] With the widespread use of power electronic components, thyristor components are commonly used in temperature control to achieve the purpose of controlling and adjusting temperature, and thyristors must use corresponding trigger circuits to ensure that the equipment works according to the control requirements. On the one hand, the thyristor trigger control modes are mainly: zero-crossing trigger and phase-shift triggering. In practical applications, since large-scale thyristor equipment adopts phase-shift triggering compared with zero-crossing triggering, it is easier to generate a large number of harmonic sources, which seriously pollutes the power grid. Quality, so zero-crossing trigger is widely used: zero-crossing conduction and zero-crossing cut-off, because the thyristor generates a lot of heat during use, and the trigger circuit around it must ensure normal, reliable and continuous operation under long-term high temperature In order to ensure the normal, reliable and continuous operation of the thyristor and its circuit under long-term high temperature, a variable-period cycle controller for triggering the thyristor of the present invention is proposed

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