Ponovo PAC60Bi, User Manual, Page: 14 / 30

PAC60Bi (PAC60Ci)/PAV120Bi POWER AMPLIFIER USER MANUAL
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2. PAC60Bi (PAC60Ci)
Current Power Amplifier
2.1 Basic Principle
This current amplifier is a kind of linear current power amplifier targeting at the CT characteristic of
power system, with the 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, and each amplifier has a output distortion detection circuit.
4) Protection circuit, which can shut off the amplifier when its temperature is too high and will
let it resume to work 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 it’s better for prolonging the service life and reducing the operation noise of the fan.
2.2 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 high current output to guarantee the operation safety
of the simulator.
2) When open circuit or waveform distortion occurs in current output, the alarm light of current
distortion on the front panel will turn on.
3) Pause control function (PAUSE). The pause button on the front panel can cut off the signal input
of the amplifier. Press the pause button, the output current will become zero.
4) When the protection is activated, the input of the amplifier will be terminated and the “Overheat”
alarm light will turn on together.