Vicor VI-J00 Family DC-DC Converters and Configurable Power Supplies - Manual (Page 38)

Design Guide & Applications Manual
For VI-200 and VI-J00 Family DC-DC Converters and Configurable Power Supplies
VI-200 and VI-J00 Family Design Guide Rev 3.5 vicorpower.com
Page 37 of 98
Apps. Eng. 800 927.9474 800 735.6200
13. AC Input Harmonic Attenuator Module (HAM)
THE HARMONIC ATTENUATOR MODULE
COMPATIBLE WITH VI-26x AND VI-J6x FAMILIES
The Harmonic Attenuation Module (HAM) 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
(Figure 13–1). The incoming AC line is rectified and fed to
the boost converter. The control circuitry varies the
operating frequency of the boost converter to regulate
and 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. A
power factor better than 0.99 is achieved (Figure 13–2).
Operating efficiency of the boost converter is optimized
at any incoming line voltage by an adaptive output
voltage control scheme.
The output voltage of the HAM varies as a function of
incoming AC line voltage (Figure 13-3). On a nominal 120
Vac line the output voltage of the HAM is 260 Vdc — well
within the input operating voltage range of Vicor VI-26x
and VI-J6x converters. As input line increases, so does the
HAM output voltage; at 220 Vac the delivered voltage will
be about 350 V. 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 unnecessarily sacrificing
operating efficiency.
The HAMD version does not contain an internal bridge
rectifier and is intended for configuring higher power arrays
with Booster versions, referred to as the VI-BAMD
(Figure 13–5).
L1 and L2/N (HAM) Pin. An appropriate line filter is
required to limit conducted emissions and ensure reliable
operation of the HAM, see page 40. Connect single phase
AC mains to the input of the line filter via a 10 A, 250 V
fuse. Connect the output of the filter to L1 and L2/N of
the HAM. Do not put an X-capacitor across the input of
the HAM or use a line filter with an X-capacitor on its
output as power factor correction may be impacted.
+IN, –IN (HAMD, BAMD) Pin. These pins are connected
to the output of the external bridge rectifier in HAMD /
BAMD configurations (Figure 13–5).
GATE IN (HAM) Pin. The user should not make any
connection to this pin.
GATE IN (HAMD) Pin. This pin provides line voltage
envelope and phase information for power factor
correction. This connection must be made through the
synchronization diodes between the line filter and bridge
rectifier (Figure 13–5).
Note:
Non-Isolated
Output
Gate In
Gate Out
ZCS
Boost
Converter
Inrush
& Short
Circuit
Protection
High Frequency
Control
Voltage
Waveform
Current
Sense
AC
Line
Control
& House-
keeping
Circuitry
Output Voltage
Module Enable
Power OK
DC
Out
Recti-
fier
Aux. Supply
+
–
NOTE: No input to output isolation.
Figure 13–1 — HAM block diagram (HAMD version has the rectifier
block deleted.)
Input Voltage
V RMS
Rated Output Power
Output Voltage
Ou
tp
ut
P
ow
er
(W
)
Ou
tp
ut
Vo
lta
ge
(V
dc
)
350
400
450
500
550
600
650
85
190
260
330
400
365
435
295
225
95 105 115 125 135 145 155 165 175 185 195 205 215 225 235 245 255 265
110 Vac
700
derate output power 8 W/V for Vin <110 Vac
Figure 13–3 — Output voltage and power rating vs. input voltage
Figure 13–2 — Input voltage and current wave forms, without and
with power factor correction.