Preventing dark current flow in a mobile terminal

• US 9,069,538 B2
• Filed: 02/12/2013
• Issued: 06/30/2015
• Est. Priority Date: 02/29/2012
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.), Sony Mobile Communications Incorporated (Sony Group Corp.)
• Inventors: Sakai, Daisuke, Suzuki, Kuniharu
• Primary Examiner(s): WANG, ALBERT C
• Application Number:
  US13/765,148
• Publication Number:
  US 20130227312A1
• Time in Patent Office: 868 Days
• Field of Search: 320/135, 713/300
• US Class Current: 1/1
• CPC Class Codes: G06F 1/263 Arrangements for using multiple switchable power supplies, e.g. battery and AC G06F1/30 takes precedence
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode

Abstract

An information processing apparatus including an internal battery device including a secondary battery; a load device configured to receive power from the secondary battery; a switch section disposed externally to the battery device and configured to generate a control signal for preventing dark current from flowing from the secondary battery to the load device; and a first switching element configured to cut off a power source path from the secondary battery to the load device based on the control signal generated by the switch section.

Claims

1. An information processing apparatus comprising:

an internal battery device including a secondary battery;

a load device configured to receive power from the secondary battery;

a receiving section configured to detachably receive a movable member;

circuitry configured to generate a control signal for preventing dark current from flowing from the secondary battery to the load device; and

a first switching element configured to cut off a power source path from the secondary battery to the load device based on the control signal generated by the circuitry, wherein

the circuitry includes a switch disposed on or within the receiving section, which becomes conductive when the movable member is received by the receiving section.

2. The information processing apparatus of claim 1, wherein

the switching element includes a field-effect transistor (FET).

3. The information processing apparatus of claim 2, wherein

a channel between a source terminal and a drain terminal of the FET is disposed in series in the power source path from the secondary battery to the load device.

4. The information processing apparatus of claim 3, wherein

a gate terminal of the FET is connected to an output of the circuitry and receives the control signal from the circuitry.

5. The information processing apparatus of claim 1, wherein

the internal battery device includes

a battery protection circuit;

a second switching element connected to a first output terminal of the protection circuit and disposed in the power source path from the secondary battery to the load device; and

a third switching element connected to a second output terminal of the protection circuit and disposed in the power source path from the secondary battery to the load device.

6. The information processing apparatus of claim 1, wherein

the internal battery device includes

a battery protection circuit including an input terminal and an output terminal;

and

a second switching element connected to the output terminal of the protection circuit and disposed in the power source path from the secondary battery to the load device, the second switching element configured to cut off a power source path from the secondary battery to the load device based on an output of the output terminal of the battery protection circuit.

7. The information processing apparatus of claim 6, wherein

the first switching element is disposed in series between the input terminal of the battery protection circuit and the power source path from the secondary battery to the load device.

8. The information processing apparatus of claim 7, wherein

a signal output by the output terminal of the battery protection circuit to the second switching element is controlled based on a status of the first switching element.

9. The information processing apparatus of claim 6, wherein

the battery protection circuit includes at least one of an overcharge detector, an overcurrent detector and an overvoltage detector and the input terminal is connected to an output of the circuitry.

10. The information processing apparatus of claim 9, wherein

a signal output by the output terminal is controlled by logically adding the output of the circuitry with an output of the at least one of the overcharge detector, the overcurrent detector and the overvoltage detector.

11. The information processing apparatus of claim 1, wherein

the movable member is a card medium.

12. The information processing apparatus of claim 1, wherein

the movable member is an earphone plug.

13. The information processing apparatus of claim 1, wherein

the switch disposed in the receiving section includes a first contact and a second contact.

14. The information processing apparatus of claim 13, wherein

the movable member includes a conductive portion that causes the first and second contacts to be short-circuited when the movable member is received by the receiving section.

15. The information processing apparatus of claim 1, wherein

the switch disposed in the receiving section includes a mechanical switch that is either actuated or made conductive based on an external force applied by the movable member.

16. An information processing apparatus comprising:

a battery;

a load configured to receive power from the battery;

an interface configured to detachably receive a movable member; and

circuitry configured to generate a signal for preventing dark current from flowing from the battery to the load when the movable member is received by the interface; and

a switching element configured to cut off a power source path from the battery to the load based on the signal generated by the circuitry.

17. An information processing apparatus comprising:

a battery;

a load configured to receive power from the battery;

an interface configured to detachably receive a movable member; and

circuitry disposed on or within the housing which becomes conductive when the movable member is received by the interface; and

a switching element configured to cut off a power source path from the battery to the load device when the circuitry is conductive.