Voltage converter, 12/220 volts 5 watts. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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The voltage converter (Fig. 4.65) provides a mains voltage of 220 V 50 Hz at a load of up to 5 W.
It consists of a master oscillator with a frequency of 100 Hz and a divider trigger on the IC IC1, powerful MOS switches VT1, VT2 and a 6-watt mains transformer with 2x9 V secondary windings, included as a step-up.
When the load increases from zero to maximum, the output voltage decreases from 250 V to 200 V, which is acceptable for most devices. In this case, the current consumed by the device increases from 80 to 630 mA.
Author: Semyan A.P.
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