Powerful stabilized voltage converter, 90 watts. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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A powerful stabilized voltage converter is designed to power various devices designed for mains voltage from batteries.
The main parameters:
- DC supply voltage, V.......24
- Output sinusoidal voltage, V.......220
- Output voltage frequency, Hz.......50
- Maximum output power, W......90
- Efficiency, % ...... not less than 70
- Load frequency instability, Hz/W.......0,003
The converter circuit contains a master oscillator that generates rectangular pulses and a power amplifier based on a ferroresonant stabilizer. The magnetic circuit of the transformer T2 is separated by a magnetic shunt MSH. The primary winding is located on the non-saturated part of the magnetic circuit, the secondary winding is located on the part that enters saturation.
Due to this and the presence of a high-quality oscillatory circuit formed by part of the winding II and capacitor C4, with rectangular pulses, a sinusoidal voltage is removed from the secondary winding. Transistors V5, V6 are installed on radiators designed for a dissipation power of at least 5 watts. Matching transformer T1 - incandescent TN 36 127/220-50. Instead, you can use a network transformer from the radio "Riga-101" or "Riga-102". In this case, the role of the primary winding is performed by its two 127 V windings connected in series. This transformer can be made independently by winding the primary winding of 16 x 24 turns of wire PEV-2 - 700 and the secondary of 1 x 0,2 turns of wire PEV-2 - 95 on a magnetic circuit Ш1 x 0,59.
Transformer T2 with a magnetic shunt - ready from a voltage stabilizer C-0,09. The mains winding of the stabilizer is removed and a winding of I - 2 X 75 turns of PEV-2 wire with a diameter of 2,44 mm is wound in its place. The compensation winding is not used, it is only necessary to carefully isolate its conclusions. Capacitor C4 is connected to the terminals of the output winding (not all terminals are shown in the diagram). The device can also be powered by 12 V, however, the load power should not exceed 40 W. In this case, the resistance of the resistor R7 is 51 ohms.
Transformer T1 - output transformer from the receiver "VEF-12", "Speedola", "VEF-202" or from the tape recorder "Kometa-206". The secondary winding, made in two wires, is separated and connected in series. Winding I of transformer T2 must contain 2 X 34 turns of wire PEV-2 2,44
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