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AN436 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN436 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 9 page 1/9 April 2004 AN436 APPLICATION NOTE TRIAC CONTROL BY PULSE TRANSFORMER Rev. D2A - 3575 INTRODUCTION Among the many ways to drive a triac the pulse transformer is one of the easiest. By applying some simple rules it can be used to design an efficient triac triggering circuit without reduction of the commutation ca- pability of the triac. WHY USE A PULSE TRANSFORMER? The use of pulse transformers in triac triggering circuits offers many advantages: – Galvanic insulation between the power and gate drive circuit (a few kV). – Gate drive circuit with a few components. – Choice of the gate current polarity (triggering in the 2nd and 3rd quadrants for SNUBBERLESS triacs). – Optimization of gate signal (single pulse or train of pulses). – Possibility to drive several triacs with only one drive circuit THE PULSE TRANSFORMER To optimize the triac and the pulse transformer in the application it is necessary to know the main charac- teristics of the transformer: The transformer ratio It is the N2/N1 ratio, where N1 corresponds to the primary winding and N2 to the secondary. The LP inductance The primary winding inductance measured at a given frequency. The RP resistance The primary winding resistance. The area of the output pulse For a given magnetic material the voltage.time product Vo.to of the output pulse is constant. For each type of transformer the manufacturer gives the maximum voltage.time product under no load operation which corresponds to the Figure 1. |
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