Converter 12/220 volts for hiking. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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In order to be able to use conventional electrical equipment powered by 220 V AC on the road or on vacation, radio amateurs collect various ones. On fig. 4.35 shows a diagram of one of these devices. The circuit consists of three functional units: a master multivibrator that generates a pulsed voltage with a frequency of 50 Hz, with an output inverter, a push-pull transistor switch power amplifier and a step-up transformer.
The multivibrator is made on a D1 chip, on elements D1.1 and D1.2. Its frequency depends on the ratings of R1 and C1. At the output of the multivibrator, an inverter on D1.4 is turned on, which creates anti-phase signals supplied to the bases of transistors VT1 and VT2, then a push-pull power amplifier on transistors VT3 and VT4 follows, loaded on the low-voltage winding of the power transformer T1, as a result, a pulsed current flows in this winding . At the output of the transformer, a high voltage is formed, which is close to sinusoidal in shape. The circuit, consisting of the step-up winding of this transformer and capacitor C4, is tuned to a frequency of 50 Hz, which further increases the sinusoidality of the output voltage. Instead of the K561LN2 chip, you can use any inverters from the K561 series, for example, the K561LA7 or K561LE5 chip, the inputs of each of the elements of which are connected together (so that a simple inverter is obtained from the AND-NOT or OR-NOT element).
KT973 transistors - with any letter index, KT805 transistors can be replaced with KT819, also with any letter indices, any network transformer with a power of 50 ... 100 W is suitable as a step-up transformer, the primary winding of which is designed for 220 V, and two secondary ones for 10 ... 15 V each (or one with a tap in the middle of 20 ... 30 V), The transformer is turned on the other way around, the low-voltage winding is the "I" winding, and the high-voltage winding is "II". Transistors VT4 and VT3 must be installed on radiators that provide reliable heat dissipation.
Author: Semyan A.P.
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