Mutual connection judging circuit
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United States of America Patent
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Jun 4, 2002
Grant Date -
Oct 4, 2001
app pub date -
Apr 2, 2001
filing date -
Apr 3, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention provides a mutual connection judging circuit for judging mutual connection between a device 3 with an incorporated battery 4 and a charger 1, wherein there are provided transistors Q1 and Q2 on the charger 1 side and the device 3 side respectively, bases of the transistors Q1 and Q2 on the charger 1 side and the device 3 side are connected with each other, and mutual connection is judged by collector potential of the transistors Q1 and Q2. The charger 1 controls the charging by judging mutual connection depending upon whether the collector of the PNP transistor Q1 is in opened state or not. The device 3 comprises a circuit Q3 for controlling emitter potential of the NPN transistor Q2, controls emitter potential depending upon whether the charging is in enable state or not, and turns on or off the NPN transistor Q2, and the charger 1 starts the charging by judging collector potential of the PNP transistor Q1. With the features of construction as described above, the mutual connection can be confirmed by a single signal line, and it is possible to control connection signal from the device side.
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