Current control circuit

Details Current control circuit Current control circuit

2004-12-21

2008-08-19

Sherry, Michael J (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Reexamination Certificate

active

07414822

ABSTRACT:
A current control circuit controls a current from a current drawing circuit to which a primary coil of a transformer is connected. A first N channel transistor has a source connected to the current drawing terminal and has a body diode that directs a current from the source to a drain. A second N channel transistor has a drain connected to the drain of the first N channel transistor and a source connected to a ground. The second N channel transistor has a body diode that directs a current from the source to the drain. The first and second N channel transistors are turned on to direct a current from the current drawing terminal to the ground via the first and second N channel transistors. The first and second N channel transistors are turned off to stop the current from the current drawing terminal. Further, the body diode of the first N channel transistor inhibits current flowing from the ground to the primary coil of the transformer.

REFERENCES:
patent: 4841166 (1989-06-01), Harnden
patent: 5438290 (1995-08-01), Tanaka
patent: 5847912 (1998-12-01), Smith et al.
patent: 5892650 (1999-04-01), Kinoshita et al.
patent: 6822518 (2004-11-01), Lin et al.
patent: 6856098 (2005-02-01), Piaskowski
patent: 2002/0085402 (2002-07-01), Zhang
patent: 2002-289385 (2002-10-01), None
English Patent Abstract of 2002-289385 from esp@cenet.

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