Power switch arrangement

• US 5,500,562 A
• Filed: 03/14/1994
• Issued: 03/19/1996
• Est. Priority Date: 03/14/1994
• Status: Expired due to Term

• Current Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Kelley, Paul H.
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): PALADINI, ALBERT WILLIAM
• Application Number:
  US08/212,097
• Time in Patent Office: 736 Days
• Field of Search: 307/64, 307/65, 307/66, 368/64, 368/203, 368/204, 368/205
• US Class Current: 307/66
• CPC Class Codes: H02J 9/061 for DC powered loads

Abstract

A split battery contact arrangement (10) for a low voltage portable electronic product having a first circuit (18) and second circuit (18) comprises a split positive battery contact having a first positive contact point (20) selectively isolatable from a second positive contact point (17), the first positive contact point being coupled to the first circuit (18) and the second circuit (16) being coupled to the second positive contact point. The arrangement further comprises a back-up energy source (24) coupled to the first positive contact point and a removable battery (12), which when removed selectively isolates the first circuit from the second circuit, thereby preventing the back-up energy source from powering the second circuit. When the removable battery is inserted, it couples the first circuit to the second circuit.

Claims

1. A split battery contact arrangement for a low voltage portable electronic product having a light resistive load portion and a relatively higher resistive load portion, comprising:

a split positive battery contact having a first positive contact point selectively isolatable from a second positive contact point, the relatively higher resistive load portion being selectively coupled to the second positive contact point when a battery is inserted between the first and second positive contact point, the relatively higher resistive load portion being completely isolated from the light resistive load portion when the battery is removed; and

a back-up energy source and the light resistive load portion coupled to the first positive contact point.

2. The split battery contact arrangement of claim 1, wherein the portable electronic product comprises a wristwatch pager.

3. The split battery contact arrangement of claim 1, wherein the relatively higher resistive load comprises a sensory alerting circuit such as an audio transducer, a lamp, or a vibrator.

4. The split battery contact arrangement of claim 1, wherein the relatively lower resistive load comprises a microprocessor and memory devices.

5. The split battery contact arrangement of claim 1, wherein the backup energy source comprises a capacitor.

6. The split battery contact arrangement of claim 1, wherein the means for coupling comprises a zinc-air battery.

8. The low voltage portable electronic product of claim 1, wherein the portable electronic product comprises a wristwatch pager.

9. The low voltage portable electronic product of claim 1, wherein the relatively higher resistive load comprises a sensory alerting circuit such as an audio transducer, a lamp, or a vibrator.

10. The low voltage portable electronic product of claim 1, wherein the relatively lower resistive load comprises a microprocessor and memory devices.

11. The low voltage portable electronic product of claim 1, wherein the back-up energy source comprises a capacitor.

12. The low voltage portable electronic product of claim 1, wherein the means for coupling comprises a zinc-air battery.

13. The low voltage portable electronic product of claim 8, wherein the relatively higher resistive load and the relatively lower resistive load reside on a circuit board within a watchcase and wherein a watch caseback and a contact point on the circuit board coupled to the relatively lower resistive load forms the split positive battery contact.

14. The low voltage portable electronic product of claim 13, wherein the caseback is coupled to the relatively higher resistive load via a spring.

15. The low voltage portable electronic product of claim 13, wherein the battery comprises a zinc-air battery.

7. A low voltage portable electronic product having a split battery contact arrangement, comprising:

a split positive battery contact having a first positive contact point selectively isolatable from a second positive contact point, a relatively higher resistive load portion being selectively coupled to the second positive contact point;

a back-up energy source and a light resistive load portion coupled to the first positive contact point; and

a battery having a positive contact used for coupling the first positive contact point to the second positive contact point.

16. A split battery contact arrangement for a low voltage portable electronic product having a first circuit and second circuit, comprising:

a split positive battery contact having a first positive contact point selectively isolatable from a second positive contact point, the first positive contact point coupled to the first circuit;

a back-up energy source and the second circuit coupled to the second positive contact point; and

a removable battery, when removed selectively and completely isolates the first circuit from the second circuit and which when inserted couples the first circuit to the second circuit.

17. The low voltage portable electronic product of claim 16, wherein the second circuit comprises a sensory alerting circuit such as an audio transducer, a lamp, or a vibrator and the first circuit comprises a microprocessor and memory devices.

18. The low voltage portable electronic product of claim 17, wherein the portable electronic device is a communication device in the form of a watch and wherein the first circuit and the second circuit reside on a circuit board within a watchcase and wherein a watch caseback and a contact point on the circuit board coupled to the first circuit forms the split positive battery contact.

19. The low voltage portable electronic product of claim 18, wherein the caseback is couple to the second circuit via a spring.

20. The low voltage portable electronic product of claim 16, wherein the battery comprises a zinc-air battery.