fázisvezérelt

Fázisvezérelt refers to a method of controlling the power delivered by an alternating current (AC) electrical device. It works by controlling the timing of when the AC waveform is switched on or off within each cycle. Instead of allowing the full waveform to pass through, the device chops off a portion of it. This chopping is done by using electronic switches, such as thyristors or triacs, which can be turned on and off at specific points in the AC cycle. The amount of power delivered is determined by the angle at which the switch is triggered, known as the firing angle or phase angle. A larger firing angle means more of the waveform is cut off, resulting in less power being delivered. Conversely, a smaller firing angle allows more of the waveform to pass, delivering more power.

This technique is widely used in various applications due to its efficiency and precise control. Common examples include dimming lights, controlling the speed of electric motors in fans and power tools, and regulating the temperature in heating elements. The advantage of phase control is that it does not dissipate significant amounts of power as heat, unlike resistive methods of power reduction. However, it can introduce harmonic distortion into the AC power system, which may require filtering in some sensitive applications. The effectiveness and suitability of fázisvezérelt control depend on the specific requirements of the application and the characteristics of the load being powered.