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SECTION 1
P1350 AC POWER SUPPLY INTRODUCTION
The Behlman model P1350 AC Power Source is a solid state frequency converter. It provides regulated AC
power at frequencies that are not available from local utility power. The output of the model P1350 is
transformer coupled providing an isolated voltage source similar to utility power. The model P1350 incorporates
the latest in hard switched, PWM technology. A high frequency “Class D” type output stage provides a savings
in weight and waste heat. This accounts for the compact size and high power capability of this AC power
source. The following is a brief description of the conversion process performed by the P1350.
Line power at 120 VAC 47 - 440Hz is applied to the input of the unit. After passing through a noise filter, the
input AC is converted to a bulk DC voltage. This DC voltage is applied to the output inverter ( refer to the block
diagram below ). The output inverter is a switch mode power amplifier. A sine wave signal of the desired
frequency is developed by the control circuitry and applied to the input of the power amplifier. This sine wave
is amplified and “stepped - up” by the output transformer to provide the proper voltage. The output voltage of
the unit is sensed electronically and used as feedback to regulate the output. This action rejects fluctuations
in the input line voltage and provides an output that may be adjusted above or below the input line. The output
current of the power source is monitored and used to provide overload protection for the output inverter.