lülitusvõimendit

Lülitusvõimendi is an electronic amplifier that operates by switching its output transistors between fully on and fully off states. This on-off switching, often occurring at high frequencies, is fundamentally different from linear amplifiers which operate their transistors in a partially conductive state. The primary advantage of a lülitus võimendi is its high efficiency, as the transistors dissipate very little power when either fully on (low voltage drop) or fully off (no current flow). This high efficiency leads to reduced heat generation and allows for smaller, lighter power supplies.

The switching process in a lülitus võimendi typically involves pulse-width modulation (PWM) or other modulation techniques to control the average output voltage or current. The high-frequency switching is then filtered to produce a smooth output signal. These amplifiers are widely used in power supply applications, motor control, and audio amplification (often referred to as Class D amplifiers in audio). The switching frequency is a critical parameter, influencing both efficiency and the complexity of filtering required. A higher switching frequency generally allows for smaller filter components but can increase switching losses. Despite their efficiency, lülitus võimendid can introduce electromagnetic interference (EMI) due to the rapid switching, necessitating careful design and shielding.