Appeal No. 95-1188
Application No. 08/046,127
10d. An input 60 Hz AC line voltage at input terminals 10a and
10b is rectified to produce a high DC voltage of 300 volts. In a
parallel circuit connected across the output from the rectifier
is a DC to DC down converter 16, a backup battery 18, and a DC to
DC up converter 20. The down converter reduces the 300 volt
output from the rectifier down to a level sufficient to recharge
the battery to 24 volts, and the output from the battery is
converted by the up converter to a high voltage of 240 volts. If
the output from the rectifier 12 remains at a value higher than
the 240 volts output from the up converter 20, then diode D1 at
the output of the up converter 20 will not become forward biased.
If the output voltage from the rectifier falls below the output
voltage value from the up converter, then the diode D1 will
become forward biased. Thus, the power switch 14 will always
have a voltage input. The power switch 14 is a DC to DC
converter that converts the high voltage input to a voltage low
enough for the load.
The alleged prior art on page 5 of the specification makes
clear that a bridge rectifier 36 (Figure 2) is typically included
in the supported device 20.
Figure 1B of Heavey discloses a standby power system housing
12 that has an AC input plug 16, and several grounded sockets 18.
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Last modified: November 3, 2007