Triac stabilized power regulator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Regulators of current, voltage, power
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In [1], a triac power controller is described, which allows not only to regulate, but also to stabilize the output voltage. This article describes a simpler circuit that allows you to regulate and stabilize the voltage (and hence the power) at a constant load. This circuit allows you to maintain the output voltage with an accuracy of 5% when the input voltage changes by 50%.
The controller circuit is shown in the figure.
The power controller contains a triac VS1, a time (phase) delay unit, a compensating circuit and a power source. With the help of the compensating circuit R8C2, a value proportional to the supply voltage is added to the voltage of the zener diode VD3. This amount is the interbase voltage of the transistor VT1. Then a decrease in the supply voltage reduces the supply voltage of the transistor VT1 and causes a decrease in the time delay, and the output voltage will not change. The lower limit of stabilization is reached at the moment when the supply voltage is equal to the specified output.
Adjustment. It is necessary to connect the regulator to the network with the load through an autotransformer and turn on the voltmeter in parallel with the load. By changing the voltage at the input of the power regulator, the variable resistor R8 achieves the minimum voltage at the load.
Capacitor C1 type K73-17 or K73-11, C2 type K50-16. Transformer T1 on the Sh5Ch6 core, the primary winding is 40 turns, and the secondary winding is 50 turns of PEL-0,2 wire. When setting up, it is necessary to observe safety measures, since the elements of the power regulator are galvanically connected to the network.
References:
- Mezhlumyan A. Stabilized triac power controller//Radio. - 2001. - N8. - C.42-43.
Author: V.F. Yakovlev
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