Appeal No. 2001-1627
Application No. 09/289,420 Page 16
of a magnetic coupling transformer MCT are interposed in series
on the rectified output line between the positive terminal of a
bridge rectifying circuit D1 and that of smoothing condenser Ci
(col. 5, lines 29-32). Yasumura further discloses that the
polarity of the drive winding NB2 is opposite to that of drive
winding NB1 to produce a voltage of reverse polarity (col. 6,
lines 29-31). It is further disclosed that MCT transfers the
alternating voltage of the switching frequency generated by the
switching output to the secondary windings Ni through the
magnetic coupling. In addition, since the secondary winding Ni
is interposed on the positive output line from the bridge
rectifying circuit D1, the switching voltage transferred to the
secondary winding is superimposed to the rectified output voltage
on the rectifying path. Owing to the superimposition of the
switching voltage, the high speed recovery type rectifying diode
D2 interposed on the rectifying path switches on and off the
rectified current at the switching frequency (col.6, line 62
through col. 7, line 6). Moreover, Yasumura discloses (col. 7,
lines 57-65)
The voltage V1 between the connection point of the
high-speed recovery type rectifying diode D2 and
secondary winding Ni and the primary ground, which is
equivalent to the voltage across the secondary winding
Ni of the magnetic coupling transformer MCT, takes on a
waveform that the alternating voltage of the switching
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