Active power factor correction and harmonic attenuation
500-1000 Watts, 85 to 265 Vac Input, 47-440 Hz Single Phase
The PF series are Single-Phase, Wide-AC Input
Active-Power Factor Correction & Harmonic Attenuation Modules.
This family of front end modules utilize the continuous mode non-isolated
boost topology which has the advantage of boosting to a regulated
DC output (380Vdc) higher than the peak of the AC input voltage
and as a result maintain longer hold up time for the downstream
dc-dc converters. This series of modules can maintain a high power
factor close to unity by forcing the input current to follow the
shape of the input voltage waveform, and by eliminating any phase
difference between both the input current and the input voltage.
The PF series of modules reduce the input harmonic
distortion level to meet MIL-STD-1399 requirements. Non sinusoidal
waveforms typically contain a fundamental waveform and higher frequency
harmonics that contain high percentage of the fundamental. Reducing
harmonics distortion is accomplished by forcing the input current
waveform to become sinusoidal in shape resulting in a fundamental
waveform and low harmonic contents.
These modules operate at a constant frequency
of 80kHz to simplify EMI requirements. PFC1000 utilizes a "lossless" passive
snubber to reduce voltage stress on components and to minimize
noise. Companion filter modules (PFF500 & PFF1000) are available
to meet MIL-STD-461 requirements.
PF500 is supplied as a Full Brick product and
requires the addition of output storage capacitance. Both PFC500 & PFC1000
are supplied with storage capacitance of 495uF & 1000uF respectively.
All three products contain inrush current limiting.