DC power amplifiers amplify the power of PWM (Pulse-Width Modulated) signals. Electronic control systems, which require high power signals in order to drive actuators or motors, use DC power amplifiers. Amplified signals are sent to DC motors and actuators after they are accepted as non-amplified signals from microcontroller inputs.
The DC input signal is obtained by the input stage, which then processes it to an appropriate level for the amplification stage. The signal power is increased at the amplification stage, which commonly employs transistors or vacuum tubes. The output stage generates the amplified DC output signal and serves as a load for the amplifier.
Amplification of voltage and/or current. Megawatt power range. Depending on the application, amplifiers can be used for AC or DC operation. For DC operation the input signal is directly coupled to the amplifier. For AC operation, filters are used to eliminate the DC components in the input signal.
A weak electrical signal is taken in and converted into a stronger output signal. External power is used to cause this change. There are three main classifications of amplifiers depending on the changes it makes to the input signal: voltage, current, or power amplifier. Power amplifiers are used to increase the power level of a signal.
Power amplifiers are used to increase the power level of a signal. A low-power signal is converted to a higher-power signal to drive output devices The most common example is an audio amplifier, which drives headphones and loudspeakers.
In this type of power amplifier, the active element conducts only when the input voltage is above a certain threshold, which reduces power dissipation and increases efficiency. Power amplifier classes D, E, F, G etc. are used to amplify PWM modulated digital signals.