UZCH switching power supply, 200 watts. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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To power a powerful AF amplifier, this switching power supply was developed, the rated power of which in the load at a mains voltage of 220 V is at least 200 W.
The mains voltage rectifier circuit is shown in fig. 5.8, and the diagram of the converter and rectifiers of the output voltage in fig. 5.9. The power supply is not stabilized because the output stage is powered. UMZCH is made according to a push-pull scheme and is not very critical to the supply voltage.
(click to enlarge)
(click to enlarge)
The main parameters of the converter:
- rated power in the load, W, not less than ..... 200;
- output voltage of each of the rectifiers at rated power, V, not less than ..... 30;
- no-load output voltage of each of the rectifiers, V, no more than ..... 40;
- efficiency factor (at P = 200 W), %, not less than.....80;
- converter operation frequency, kHz.....25...35.
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 diode VD7 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 converter is a push-pull half-bridge oscillator launched by a relaxation oscillator based on transistors VT1, VT2.
The winding data of transformers T1 ... T3 are given in Table 5.2.
The recommended winding order of the windings of the transformer T3 is as follows: winding I, shielding, windings V - XII, shielding, windings II, III, IV 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 are of the DM type. The converter board is placed in a perforated casing. Outside it, at the output of each channel of the 30 V power supply, the following are installed: electrolytic capacitors of the K50-16 type with a capacity of 1000 μF.
Author: Semyan A.P.
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