Converter of single-phase voltage to three-phase. Encyclopedia of radio electronics and electrical engineering

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

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The single-phase to three-phase voltage converter is designed on the basis of the power regulator circuit given in [1]. It is connected to the mains via an SF1 circuit breaker providing the rated current consumption.

Fig.1 (click to enlarge)

After turning on the network, the shift register DD2 is reset to zero for the time of charging the capacitor C2 through the resistor R5. After charging C2 to the response voltage of the element DD1.1, a shift in the register DD2 is allowed. When the register output is set to logic "1", the transistor connected to it (VT1 ... VT6) opens, which switches the corresponding thyristor. The timing diagram of operation (sequence of thyristor switching) is shown in Fig. 2. C4 ... C6 - switching (locking) capacities.

Ris.2

Their values ​​are approximate. They are selected depending on the motor power and thyristor switching frequency. The capacitance value can be calculated using an approximate formula.

C=(0,01 P(W)/n)*(1/30n) (uF), where n=1 at the rated frequency of the motor.

After setting up the circuit, R3 and R4 are soldered, a capacitor with a capacity of 4 microfarads is soldered in place of R0,68. A tuning resistor with a resistance of 15 kOhm is soldered between points A and B, which accurately sets the speed of the electric motor.

Literature

1. Radio, 1987, No. 12. p.22
2. RL No. 1, 2000, p.17.

Author: V.Solomykov, Kirensk, Irkutsk region; Publication: N. Bolshakov, rf.atnn.ru

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