Expanding the possibilities of a dynamic lighting installation. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Color and music settings
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The refinement described below can be carried out with any automatic light-dynamic installation (SDU), the power amplification unit of which is assembled according to the traditional scheme - channel trinistors with series-connected screen device lamps are connected in parallel to the diagonal of a diode bridge powered directly from the mains. The modification concerns the power amplification unit, in which six diodes VD5-VD10 are added (see diagram), an additional lamp (EL4 - EL9) of the screen is connected in series with each diode. We will consider the operation of the block on the upper pair of channels according to the scheme.
When both trinistors VS1 and VS2 are closed, lamps EL1 and EL2 do not light up. The voltage between the anodes of the trinistors is zero, so the additional lamps EL4 and EL5 do not light up either.
When the trinistor VS1 opens, and VS2 is closed, the EL1 and additional EL5 lamps are lit. If, on the contrary, the trinistor VS2 opens, and VS1 is closed, then the lamps EL2 and EL4 are lit. And finally, when both trinistors are open, the lamps EL1 and EL2 are lit. Additional lamps EL4 and EL5 do not light up, since the voltage between the anodes of the trinistors is again zero.
The interdependence between any other pairs of SCRs of the channels of the power amplification unit is similar to that described. Additional lamps must be rated for the same voltage as the main ones, and their power must be significantly less than the main ones. The permissible forward current of the diodes VD5 - VD10 must be at least the operating current through additional lamps, and the maximum permissible reverse voltage must be at least the supply voltage of the unit.
A modified power amplification block provides background transitions between channels. The diagram shows a modified three-channel block. Similarly, it is possible to remake a four-channel SDU, however, the power of additional lamps will have to be chosen even less, otherwise their burning will be accompanied by illumination of the main lamps.
Author: V. Shelekhov; Publication: cxem.net
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