Voltage converter for electric shaver, 12/220 volts 2,5 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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The popular Era electric razor runs on AC power only, so it cannot be used in a car. The device described below is designed to power this electric shaver from the car's on-board network with a constant voltage of 12 V. It draws a current of about 2,5 A under load.
The converter (Fig. 4.33) contains a master oscillator for a frequency of 100 Hz on a DD1.1 trigger, a frequency divider by 2 on a DD1.2 trigger, a preamplifier on transistors VT1, VT2 and a power amplifier on transistors VT3, VT4, loaded with a transformer T1.
The master oscillator has a very high frequency stability (no worse than 5% when the supply voltage changes from 6 to 15 V). The frequency divider simultaneously plays the role of a balancing stage, allowing you to improve the shape of the output voltage of the converter.
Chip DD1 and pre-amplifier transistors are fed through the filter R9, C3, C4. The secondary winding of the transformer T1 with the capacitor C5 and the load form an oscillatory circuit with a resonant frequency of about 50 Hz. Chip K561TM2 can be replaced by 564TM2. Instead of transistors KT973B (VT1 and VT2), you can use a composite emitter follower on transistors of the KT361 and KT502 series. KT805AM transistors can be replaced by any powerful ones of a similar structure. Capacitors C1 and C2 - KMBP, C3 - KM-5, C4 - K50-6, C5 - MBGO for a voltage of 400 V. Transistors VT3, VT4 should be placed on heat sinks, when using metal transistors, a radiator is optional.
The Tl transformer can be rewound from any 30...50 W mains transformer. All secondary windings are removed from the transformer (the network will serve as winding II), and instead of them, two half-windings are wound with PEL or PEV-2-1,28 mm wire, each with a number of turns corresponding to a transformation ratio of about 20 in relation to the left 220 V winding .
Author: Semyan A.P.
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