Thyristor current converter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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The thyristor current converter is designed to convert direct current into alternating current. For example, for powering devices designed for operation from 127-220 V from the on-board network of a car. Figure 1 shows a diagram of such a relaxation-type converter.
When the power is connected, the trinistors V2, V3 alternately open, creating a pulsating current in the primary winding of the transformer T1. A voltage appears on the secondary winding, from which the load is powered.
The capacitance of the capacitor C1 is selected depending on the current through the SCRs. So, for example, at a current of 0,5 A, a capacitance of 2 μF is sufficient, and at a current of 2 A, a capacitance of 20 μF. The capacitor must allow operation when the voltage polarity is reversed with an amplitude twice the supply voltage.
The operability of the device is maintained when the supply voltage changes from 12 to 24 V. This device uses a T1 transformer assembled on a magnetic circuit Ш20 x 30. Winding I contains 2 x 160 turns of wire PEV-2 - 0,35, winding II, designed for a voltage of 60 V, - 780 turns of PEV-2 wire - 0,25. If it is necessary to obtain a voltage of 220 V from the secondary winding, the number of turns should be increased to 2860. The inductor L1 contains 350 turns of PEV 2 - 0,25 wire wound on the same magnetic circuit as the transformer.
The operating frequency of the converter with the ratings indicated in the diagram is 50 Hz, and the output power is about 10 watts. The power of the converter can be increased by replacing the trinistor KU201 with KU202 and using a thicker wire for the transformer winding.
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