Bi-polar PNP chopper

Details Bi-polar PNP chopper Bi-polar PNP chopper

2006-03-28

2006-03-28

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

By periodic switching

C330S009000

Reexamination Certificate

active

07019566

ABSTRACT:
A switch comprises an input with two input lines and an input stage comprising four current controlled PNP-transistors and four resistors, and an output comprising two output lines, and arranged to receive a constant voltage on the input and on the output produce a variable voltage. The switch further comprises four constant current sources which are connected to the bases of the first, second, third and fourth transistor, respectively so that the transistors are saturated. The switch further comprises four alternating current sources which are connected to the emitters of the first, second, third and fourth transistor, respectively, so that the transistors alternately are conducting current from emitter to collector and from collector to emitter. Furthermore, an amplifier, a comparator and a method for tuning the working point of a power transistor can be provided using such a switch.

REFERENCES:
patent: 5486788 (1996-01-01), Schlager et al.
patent: 5959498 (1999-09-01), Sauer
patent: 6307430 (2001-10-01), Thomsen et al.

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