Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2005-02-15
2008-09-02
Berhane, Adolf (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S282000
Reexamination Certificate
active
07420356
ABSTRACT:
A current direction detection circuit includes a monitoring transistor having a control terminal and an output terminal respectively connected with a control terminal and an output terminal of a ground side output transistor; an impedance element having one terminal connected with an input terminal of the monitoring transistor and the other terminal grounded; first and second constant-current sources; a diode-connected reference transistor interposed between the first constant-current source and ground potential; and a sensing transistor interposed between the second constant-current source and the impedance element and having a control terminal connected with the control terminal of the reference transistor. The current direction detection circuit is small yet capable of minimizing power loss of a switching regulator.
REFERENCES:
patent: 6847197 (2005-01-01), Susak et al.
patent: 7132818 (2006-11-01), Matsuura
patent: 7245116 (2007-07-01), Tateno et al.
patent: 7298122 (2007-11-01), Bernacchia et al.
patent: 7323850 (2008-01-01), Ryu et al.
patent: 2000-092824 (2000-03-01), None
Berhane Adolf
Keating & Bennett LLP
Rohm Co. Ltd
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