Mains power supply for transistor equipment, 220/±6,8 volts 350 milliamps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The network power supply for transistor equipment has small overall dimensions and weight, high efficiency.
(click to enlarge)
The mains voltage is lowered by capacitor C1, rectified by a diode bridge (VI-V4) and then converted by a push-pull transformer converter (transistors V6, V7). From the secondary windings of the transformer T1 (only one is shown in the diagram), the necessary alternating voltage is removed. Capacitor C2 smooths out voltage ripples. The operating frequency of the converter is about 3 kHz. Transformer T1 disconnects the load and the network, and since the conversion frequency is quite high, the overall dimensions of the transformer are small.
The voltage from the secondary winding is rectified by a bridge rectifier (V8-V11), the ripples are smoothed out by capacitors C3, C4. At the output, two bipolar voltages of 6,8 V are obtained, stabilized by zener diodes V12, V13. Load current up to 350 mA.
The magnetic circuit of the transformer T1 is tape, toroidal, made of permalloy 79 NM. The dimensions of the magnetic circuit are 40 x 30 x 10 mm, the thickness of the tape is 0,1 mm.
Windings 1-2 and 6-7 contain 20 turns of wire PEV-2 - 0,1, winding 3-5 has 2 X 100 turns of wire PEV-2 - 0,2 and 8-10 - 2 x 30 turns of wire PEV- 2 - 0,31. The transformer can use standard cores OL 25/40-6,5, OL 28/40-10. Transistors V6, V7 should be installed on radiators with an area of about 20 cm2, capacitor C1 should have an operating voltage of at least 400 V.
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