Charger detection and enable circuit

Details Charger detection and enable circuit Charger detection and enable circuit

2005-07-19

2005-07-19

Tweel, Jr., John (Department: 2636)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S660000, C323S304000, C323S311000

Reexamination Certificate

active

06919811

ABSTRACT:
A detection circuit is configured to detect the presence of a power source by comparing two input voltages (VIN1, VIN2). An example detection circuit is arranged, such that the first input voltage (VIN1) may operate above the process limit for transistor breakdown, while the second input voltage (VIN2) should be maintained below the transistor breakdown voltage. The detection circuit includes a built-in offset voltage (VOS) for hysteresis such that the detection signal is activated when VIN1>VIN2+VOS. The detection circuit is useful for providing an enable signal in a battery charger application. It is envisioned that the detection circuit is also useful in other applications where detection of a power source is required, and where detection of one voltage relative to another may be desired.

REFERENCES:
patent: 4377781 (1983-03-01), Tatsushi et al.
patent: 5175489 (1992-12-01), Mizuide
patent: 5610506 (1997-03-01), McIntyre
patent: 6392392 (2002-05-01), Nakahara
patent: 6420936 (2002-07-01), Nishiyama
patent: 6456086 (2002-09-01), Bolz et al.
patent: 6703813 (2004-03-01), Vladislav et al.
patent: 6717458 (2004-04-01), Potanin

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