3-phase voltage conditioners. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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3-phase voltage sources are used to power electric motors, in measuring technology, in single-sideband radio technology, etc. To form a 3-phase signal, a classic Scott transformer was previously used - a device that sums sinusoidal signals shifted at angles of 90 and 180 ° in a certain order (Fig. 1).
The disadvantages of such a technical solution are obvious. This is the need for two power supplies, a limited frequency range, distortion and signal loss, etc.
To simplify the transformer-based 3-phase voltage driver. Scott (transition to power from a single source), when the device is operating at a fixed frequency, you can use a phase-shifting chain (Fig. 2).
However, using a modern element base and the principle of dosed addition of phase-shifted sinusoidal signals, the problem of forming a 3-phase voltage can be solved quite easily.
Figure 3 shows an electronic 3-phase voltage driver with two sources of input, phase-shifted voltages E1 and E2.
The second version of a similar shaper is shown in Fig.4.
Electronic drivers of 3-phase voltage at a fixed frequency with phase-shifting RC circuits are shown in Figs. 5 and 6.
When using source. E1 with a voltage of 1 V, the output voltage for each of the outputs is 0,5 V.
The adjustment of the shapers consists in the selection of resistive elements to ensure the required output voltage of each phase and the equality of the output voltages.
Author: M. Shustov, Tomsk
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