Symmetrical dinistor in a transformerless power supply. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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A very interesting circuit solution is the use of a symmetrical dinistor to stabilize the voltage of a transformerless power supply with a quenching capacitor. Device diagrams are shown in fig. 6.14 and fig. 6.15.
When the filter capacitor C2 is charged to the turn-on voltage of the dynistor VS1 (up to the voltage drop across the rectifier bridge), it turns on and shunts the input of the diode bridge. The load receives power from the capacitor C2 At the beginning of the next half-cycle, C2 is recharged again to the same voltage, the process is repeated. It is easy to see that the initial discharge voltage of capacitor C2 does not depend on the load current and mains voltage, so the stability of the output voltage of the unit is very high.
The voltage drop across the dinistor in the on state is small, the dissipated power, and hence the heating, is much less than when installing a zener diode. The maximum direct or pulsating current through the dinistor is determined by the power dissipated by it and is about 60 mA.
If this value is not enough to obtain the required output current, you can "power" the dinistor with a triac or trinistor (Fig. 6.16).
The advantages of power supplies with a dinistor are lower power dissipation and greater stability of the output voltage, the disadvantage is a limited choice of output voltages, determined by the turn-on voltages of dinistors.
Author: Semyan A.P.
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