Source 3-phase voltage used to power the motors, measurement technology, in the technique of single-sideband radio, etc., To form 3-phase signal previously used classic transformer Scott the device, in a specific order adder offset by angles of 90 and 180° sinusoidal signals (Fig.1).
The disadvantages of such a technical solution is obvious. It the need for two power supplies, a limited frequency range, distortion and loss of signal, etc.
To simplify driver 3-phase voltage on the basis of of the transformer. Scott (the transition of power from one source) at work device at a fixed frequency, you can use phase-shifting chain (Fig.2).
However, using modern element base and the principle metered addition shifted in phase sinusoidal signals, the problem the formation of 3-phase voltage can be solved quite easily.
In Fig.3 shows the electronic driver 3-phase voltage with two sources of input, shifted in phase of the voltages E1 and E2.
The second option is similar to the shaper is presented in Fig.4.
E-shapers 3-phase voltage to a fixed the frequency with phase-shifting RC-circuits is depicted in Fig.5 and 6.
When using source. E1 voltage 1 output voltage for each of the outputs is 0.5 V.
Setup Builder is the selection of resistive elements to provide the required output voltage of each phase and equality of output voltages.
Author: M. Shustov, Tomsk