Power regulator for electric heaters. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Regulators of current, voltage, power
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There are many circuits of power regulators based on thyristors or triacs described in the literature. Basically, the phase principle of voltage regulation at the load is used. Regulators of this type create interference that propagates far through the electrical network, so they should only be used with bulky LC filters. In cases where it is not important that the power is given to the load every half-cycle, but it is necessary to regulate the average power value over a certain period of time, for example, for electric heaters, the noise level can be significantly reduced by switching the load when the mains voltage passes zero.
The scheme of Fig. 1 is based on the publication in "Elektrik" 8/2000, p.23.
(click to enlarge)
The scheme has been finalized and tested. It was possible to obtain high electrical parameters only by using the BT-137600 triac from Philips Semiconductor. This device turned out to be for this class of triacs a small current of the control electrode and a small voltage drop in the open state. When using domestic triacs, it is necessary to select them according to the minimum current of the control electrode, excluding resistors R12, R13.
As C3, a capacitor of the K73-17 type with an operating voltage of 400 V is used. Resistor R3 of the SP3-4am type. Resistors R5, R6, R14 have a power of 0,5 W, the remaining resistors have a power of 0,125 W.
The regulator is mounted on a printed circuit board made of one-sided foil fiberglass 1,5 mm thick, 80x80 mm in size. The drawing of the printed circuit board and the placement of elements on it are shown in Fig. 2. The triac is mounted on a ribbed aluminum alloy radiator with dimensions of 70x40x25 mm.
The assembled circuit is installed in a case from a temperature controller of the RT-3 type. Establishing the circuit consists in selecting the resistor R12 for reliable inclusion in the range of mains voltage changes.
The scheme has passed more than a year of testing together with the electric stove "Malva" with a power of 1 kW, there were no comments on its operation.
Author: O.V.Belousov
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