Voltage converter, 220/30 volts 200 watts. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Voltage converter, 220/30 volts 200 watts. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters

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The converter is designed to power a powerful load, such as a powerful ULF. The mains voltage rectifier circuit is shown in Fig. 1, and Fig. 2 shows a diagram of the converter and output voltage rectifiers. The power supply is unstable.

Voltage converter, 220/30 volts 200 watts
(click to enlarge)

(click to enlarge)

The main parameters of the converter:

Rated power in the load, not less than ....... 200 W.
The output voltage of each of the rectifiers at rated power ....... 30 V.
The output voltage of each of the rectifiers at idle, not more than ....... 40 V.
K.P.D. (at pH=200 W.), not less than.......80%
Conversion frequency ....... 25...35 kHz.

To limit the inrush current, the power supply provides a step-by-step power increase mode to the nominal one. For this purpose, a limiting resistor R2 and a trinistor VD6 are introduced into it.

At the initial time, the trinistor VD6 is closed, the charging current of the capacitor C6 is limited by the resistor R2 and the converter starts at a reduced voltage. After that, from the winding IV of the transformer T3 (see Fig. 2) the diode VD7 (see Fig. 1) receives a control voltage, which opens the trinistor. It shunts the resistor R2, and the converter enters the nominal operating mode. Diode VD5 protects the trinistor VD6. The circuit R1, C2, which limits the rate of voltage rise at the anode of the trinistor VD6, eliminates its spontaneous switching on. Elements L1, L2, C3, C4 form a filter that suppresses impulse noise generated by the power supply generator.

The winding data of transformers T1 - T3 are given in the table. The recommended winding order of the T3 transformer is as follows: winding I, shielding, windings V-XII, shielding, windings II, III, IV. The secondary windings V-XII are wound simultaneously in four wires.

The T4 transformer is made on a Sh6x6 magnetic circuit made of 2000NMS ferrite, each of its windings contains 40 turns of PEV-2 0,41 wire. All chokes type DM.

number	Magnetic circuit	Wire brand and diameter	Number of turns, winding numbers
number	Magnetic circuit	Wire brand and diameter	V-I	II	III	IV	XII
T1	K10X6X3 Ferrite 3000NMS	PEV-2 0,56	4	4	9	2	--
T2	K10X6X3 Ferrite 2000NM-A	PEV-2 0,56	4	2	--	--	--
T3	PK30X16 Ferrite 3000NMS	PEV-2 0,9	48	48	6	6	19*

The converter board is placed in a perforated casing. Outside of it, at the output of each channel of the 30 volt power supply, electrolytic capacitors of the K50-16 type with a capacity of 1000 microfarads are installed.

The windings V-XII of the T3 transformer are wound with PEV-2 0,56 wire.

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