VI-HAM-CL Vicor Corporation, VI-HAM-CL Datasheet - Page 4

• Manufacturer Part Number: VI-HAM-CL
• Manufacturer: Vicor Corporation

TECHNICAL DESCRIPTION
The HAM (Figure 1) consists of a full-wave rectifier, a
high-frequency zero-current switching (ZCS) boost converter,
active inrush current limiting, short-circuit protection, control
and housekeeping circuitry. The incoming AC line is rectified
and fed to the boost converter. The control circuitry varies the
operating frequency of the boost converter to maintain the
output voltage of the HAM above the peak of the incoming
line, while forcing the input current to follow the waveshape
and phase of the line voltage. The AC input current follows the
voltage waveform and a power factor better than 0.99 is
achieved. Operating efficiency of the boost converter is
optimized at any incoming line voltage by an adaptive output
voltage (Figure 3) control scheme.
Figure 1
Figure 3
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NOTE: No input to output isolation.
Gate Out
Line
Gate In
AC
Waveform
Voltage
Recti-
fier
& House-
Converter
Circuitry
keeping
Control
Current
Sense
Boost
ZCS
Aux. Supply
High Frequency
Control
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Module Enable
Output Voltage
Protection
Power OK
& Short
Circuit
Inrush
Out
DC
Note:
Non-Isolated
Output
+
–
Input Voltage
V
HAM, High-Boost Harmonic Attenuation Module
RMS
Figure 2
The output voltage of the HAM is a function of incoming AC
line voltage (Figure 3). On a nominal 115 Vac line, the output
voltage of the HAM is 280 Vdc — well within the input
operating voltage range of Vicor V375 DC-DC converters.
Above 180 Vac input, the output voltage linearly increases with
input voltage. At 230 Vac the delivered voltage will be
aproximatly 365 Vdc. For any given input line voltage, the
HAM maintains enough headroom between the output voltage
and peak input voltage to ensure high quality active power
factor correction without sacrificing operating efficiency.
Rated Output Power
Output Voltage
Rev. 2.3
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