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 Title: |
US5623550:
Battery power supply circuit which supplies correct power polarity irrespective of battery orientation
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Killion, Mead; Elk Grove Village, IL
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| Assignee: |
Etymotic Research, Inc., Elk Grove Village, IL
other patents from ETYMOTIC RESEARCH, INC. (183455) (approx. 39)
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| Published / Filed: |
1997-04-22
/ 1995-03-08
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| Application Number: |
US1995000400876
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| IPC Code: |
Advanced:
H01L 23/64;
H02H 11/00;
H02J 7/00;
H02M 7/219;
H04R 25/00;
Core:
H01L 23/58;
more...
IPC-7:
H04R 25/00;
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| ECLA Code: |
H01L23/64C; H02H11/00C2; H02J7/00D2; H02J7/00E2; H02M7/219; T04R25/00M2;
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| U.S. Class: |
Current:
381/322;
307/127;
363/063;
Original:
381/069.2;
363/063;
307/127;
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| Field of Search: |
363/063
307/127
381/69.2,68
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| Priority Number: |
| 1995-03-08 |
US1995000400876 |
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| 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.
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| Attorney, Agent or Firm: |
McAndrews, Held & Malloy Ltd. ;
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| Primary / Asst. Examiners: |
Kuntz, Curtis; Nguyen, Duc
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| INPADOC Legal Status: |
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| Designated Country: |
AL AM AP AT AZ BB BG BR BY CA CH CN CZ DE DK EE EP ES FI GB GE HU IS JP KE KG KP KR KZ LK LR LT LU LV MD MG MK MN MW
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| Family: |
Show 4 known family members
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First Claim:
Show all 16 claims |
We claim as our invention:
1. A hearing aid comprising:
- a microphone for transducing audio waves into electronic signals;
- an amplifier for amplifying the electronic signals;
- a receiver for transducing the amplified electronic signals to sound waves;
- a battery for supplying power to the amplifier; and
- battery switch means including first and second battery terminals in electrical contact with the battery for supplying power of correct polarity to the amplifier irrespective of battery polarity orientation, the battery switch means comprising
- a first transistor switching circuit connected between the first and second battery terminals and responsive to voltage from the battery to through-connect a negative polarity power signal therethrough, the first transistor switching circuit comprising
- a first n-channel MOSFET having gate terminal, a drain terminal, and a source terminal, the drain terminal being connected to the first battery terminal the gate terminal being connected to the second battery terminal,
- a second n-channel MOSFET having a gate terminal, a drain terminal, and a source terminal, the drain terminal being connected to the second battery terminal, the gate terminal being connected to the first batten/terminal, the source terminal of the first n-channel MOSFET being connected to the source terminal of the second n-channel MOSFET and supplying the negative polarity power signal, and
- a voltage divider circuit disposed between the first and second battery terminals and connected to the source terminals of the first and second n-channel MOSFETs, the voltage divider circuit comprising
- a first resistor having a first terminal connected to the first battery terminal, and a second terminal, and
- a second resistor having a first terminal connected to the second battery terminal, and a second terminal connected to the second terminal of the first resistor, the second terminals of the first and second resistors being connected to the source terminals of the first and second n-channel MOSFETs, and
- a second transistor switching circuit connected between the first and second battery terminals and responsive to voltage from the battery to through-connect a positive polarity power signal therethrough.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 10 U.S. patent(s) that reference this one
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