PA460Bi-L Power Amplifier User Manual
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5. Functions of Voltage Amplifier
5.1 Basic Principle
This voltage power amplifier is a linear voltage power amplifier specially targeting at the PT
characteristics of power system with the strengths of high accuracy, high voltage and quick
response, which consists of below parts mainly:
1) High-speed differential input circuit for amplifier;
2) Voltage power amplifier module;
3) Detection and alarm circuit: each amplifier has an output distortion detection circuit.
4) Temperature protection circuit: It will terminate the amplifier as soon as the
temperature of the amplifier reaches dangerous degree and will let the amplifier
resume to work automatically when it has been cooled down to a reasonable level.
5) Cooling fan: Fan will work at low speed if amplifier temperature is certain low,
which is benefit for prolonging its service life and reducing working noise.
5.2 Function
1) The differential input circuit can reduce the influence of the common mode noise to
make it possible that use long wires to connect across the amplifier and signal source,
which will reduce mutual effects between all amplifiers during output to guarantee the
operation safety of the simulator.
2) The output voltage distortion and overload auto-detection circuit will protect the voltage
amplifier output overload or short-circuit automatically. It automatically closes amplifier
