Phase power regulator for 12-volt AC circuit. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Phase power regulator for 12V AC circuit. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Regulators of current, voltage, power

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Many halogen lamps are powered by a low voltage AC source, typically 42 volts. These are various spotlights and other lamps in offices, residential premises. There are also soldering irons for 12 volts. These consumers are powered by an alternating voltage of 12 volts from a local step-down transformer.

In order to regulate the brightness of the light of halogen lamps or the temperature of a low-voltage soldering iron, you can use a phase regulator, like those that operate at -220 V, but rated at -12 V. The figure shows a diagram of one of the possible options for such a regulator.

Phase power regulator for 12V AC circuit

The circuit is built on the same principle as the "large" (220 volt) phase regulator. Power is supplied to the load through a powerful triac VS1 And its opening phase is regulated using the RC circuit R1-R2-C1. An analogue of a low-voltage symmetrical dinistor is assembled on transistors VT1-VT4. The regulator can operate with a load of no more than 100 watts.

This regulator can only be used in low-voltage networks, where reduced voltage is obtained using a conventional low-frequency step-down power transformer.

With the so-called "electronic transformer", the operation of this regulator is impossible due to the presence of a high-frequency component in the output voltage of the "electronic transformer". The triac must be installed on a heat sink.

Literature

Radioconstructor 2009 №12

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