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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A single-phase to three-phase voltage converter (Fig. 4.53) is designed to power a three-phase electric motor. It is connected to the mains via an SFI circuit breaker providing the rated current consumption.

(click to enlarge)

After switching on the network, the shift register DD2 is reset to zero for the time the capacitor C2 is charged 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 time diagram of operation (thyristor switching sequences) is shown in fig. 4.54.

Capacitors C4 ... C6 - switching (locking) capacitances. Their values ​​are approximate. They are selected during circuit setup, depending on the motor power and thyristor switching frequency.

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.

Author: Semyan A.P.

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