Voltage converter 12/220 volts 30 watts. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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The device described below converts a 12 volt DC automotive voltage to 220 V AC, at a frequency of 50 Hz. The output power is about 30 watts. It consumes a current of about 2,5 A under load.
The converter contains a master oscillator at a frequency of 100 Hz on a DD1.1 trigger, a frequency divider by 2 on a DD1.2 trigger, a pre-amplifier on transistors VT1, VT2 and a power amplifier on transistors VT3, VT4, loaded with transformer T1.
(click to enlarge)
The master oscillator has a 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. 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 K564TM2. Instead of KT973B transistors, you can use a composite emitter follower on transistors of the KT361 and KT502 series. Capacitors C1 and C2 - KMBP, C3 - KM5, C4 - K50-6, C5 - MBGO for a voltage of at least 400V. Transistors VT3, VT4 should be placed on heat sinks with a usable area of about 8 cm1 each; when using metal transistors, a heatsink is not required. Transformer T30 can be rewound from any network transformer with a power of 50..21 W. All secondary windings are removed (the network will serve as winding II), and instead of them, two half-windings are wound with a PEL or PEV-28, 20 wire, each with a number of turns corresponding to a transformation ratio of about 220 in relation to the left winding at XNUMX V.
The converter assembled from serviceable parts does not require adjustment, with the exception of the selection of capacitor C5 from the condition of obtaining the maximum output voltage with the load connected.
Authors: S.Karlashchuk, V.Karlashchuk, Moscow; Publication: cxem.net
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