Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By polarity
Patent
1995-03-23
1997-08-26
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By polarity
381 692, 361760, 361811, G01R 1900
Patent
active
056614209
ABSTRACT:
A power supply circuit is set forth which overcomes the problems associated with incorrect battery insertion. The power supply circuit includes first and second battery terminals for electrical connection to the battery. The first and second battery terminals are connected to a first transistor switching circuit. The first transistor switching circuit is responsive to power from the battery to through-connect a negative polarity power signal therethrough irrespective of the polarity orientation of the battery. The first and second battery terminals are also connected to a second transistor switching circuit. The second switching circuit is responsive to power from the battery to through-connect a positive polarity power signal therethrough irrespective of polarity orientation of the battery. The negative and positive polarity power signals are available for connection to a load device, such as a hearing aid amplifier. The device is thereby provided with proper power polarity irrespective of the way in which the battery is inserted between the first and second battery terminals. The power supply circuit is implemented in an integrated circuit format and is mounted with a chip capacitor.
REFERENCES:
patent: 3490055 (1970-01-01), Cox
patent: 4423456 (1983-12-01), Zaidenweber
patent: 5210804 (1993-05-01), Schmid
patent: 5309324 (1994-05-01), Herandez et al.
patent: 5367430 (1994-11-01), Devoe et al.
patent: 5375035 (1994-12-01), Stoddard
patent: 5379189 (1995-01-01), Merriman
patent: 5402321 (1995-03-01), Izu et al.
Killion Mead
Stewart Jonathan K.
Callahan Timothy P.
Etymotic Research Inc.
Kim Jung Ho
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