fázisvezérlés

Fázisvezérlés, also known as phase control, is a method used in electronics and electrical engineering to control the power delivered to a load by varying the point in the alternating current (AC) waveform at which the current is switched on. This is typically achieved using semiconductor devices such as thyristors or triacs.

The fundamental principle of fázisvezérlés involves interrupting the AC waveform at a specific point within each half-cycle. By delaying the turn-on of the switching device, a portion of the AC waveform is effectively blocked, thus reducing the average power delivered to the load. The greater the delay, the less power is supplied. The control is achieved by adjusting a trigger signal to the semiconductor device, which determines the firing angle, or the point in the AC cycle where conduction begins.

Fázisvezérlés is widely employed in applications where variable power output is required, such as dimming lights (phase-cut dimming), controlling the speed of AC motors in fans and pumps, and regulating the temperature in heating elements. It offers an efficient and cost-effective way to achieve power regulation without the need for more complex and expensive components like variable transformers or complex motor controllers in some scenarios. However, it can also introduce harmonic distortion into the power supply, which may require filtering in certain applications.