PA460Bi-L Power Amplifier User Manual
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4. Functions of Current Amplifier
4.1 Basic Principle
This current amplifier is a kind of linear current power amplifier targeting at the CT
characteristic of power system, with strengths of high accuracy, high current and quick
response, which consists of below parts mainly:
1) High-speed differential input circuit for amplifier;
2) Current power amplifier module;
3) Detection and alarm circuit: each amplifier has an output distortion detection circuit.
4) Protection circuit, by which the amplifier can be terminated when its temperature is
too high and will resume working when it is cooled down to a reasonable degree.
5) Cooling fan. When the temperature of the amplifier is quite low, the fan will work at
low speed for prolonging the service life and reducing the operation noise of the fan.
4.2 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 producing high currents to
guarantee the operation safety of the simulator.
2) When one current output is open-circuit or overload, the indicator of overload to the
related phase on front panel will be on. After overload and open-circuit disappear, it
