Appeal No. 1997-0288
Application No. 08/200,123
The disclosed invention relates to a load driver that
produces a variable output voltage at a substantially constant
current.
Claim 1 is illustrative of the claimed invention, and it
reads as follows:
1. A load driver adapted to produce a variable voltage
output at substantially constant current, comprising in
combination:
a transformer including primary and secondary windings,
the secondary winding including first and second ends;
an ouput branch to be connected to a reactive and
inductive load, and connected to the secondary winding; the
output branch including a resistor aside from the load;
a transistor connected to the primary winding so as to be
operable to modulate current flow therethrough, the transistor
including a control input;
a pulse-width modulator connected to the resistor so as
to be operable to sense current flow therethrough, and
connected to the control input of the transistor so as to be
operable to modulate current flow therethrough in response to
the current flow through the resistor, to produce a
substantially constant current, variable voltage output.
The reference relied on by the examiner is:
Saito et al. (Saito) 5,297,014 Mar. 22,
1994
(filed Jan. 3, 1992)
Claims 1 through 9 stand rejected under 35 U.S.C. § 103
as being unpatentable over Saito.
2
Page: Previous 1 2 3 4 5 6 7 8 Next
Last modified: November 3, 2007