Charging device for portable electronic device battery and portable phone battery

• US 7,839,119 B2
• Filed: 11/19/2007
• Issued: 11/23/2010
• Est. Priority Date: 11/20/2006
• Status: Expired due to Fees

• Current Assignee: NEC Tokin Corporation (Yageo Corporation)
• Original Assignee: NEC Tokin Corporation (Yageo Corporation)
• Inventors: Onose, Katsuya
• Primary Examiner(s): Tso; Edward
• Assistant Examiner(s): DIAO, M BAYE
• Application Number:
  US11/942,289
• Publication Number:
  US 20080224661A1
• Time in Patent Office: 1,100 Days
• Field of Search: 320/113
• US Class Current: 320/113
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 2310/22 The load being a portable electronic device
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00306 Overdischarge protection
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/0049 Detection of fully charged condition
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters

Abstract

A charging device for a portable phone is provided which is capable of achieving its improved usability by making the device small-sized, improving its portability, and enabling instant telephone speech even in a state in which a battery of the portable phone has been exhausted. The charging device for a portable phone for charging a rechargeable battery housed in a portable phone includes the first charging section to charge the rechargeable battery housed in the portable phone and the second charging section to charge the lithium-ion battery built in the first charging section in which the first and second charging sections are connected so as to be freely detachable and attachable from or to each other and can be disconnected from each other.

Claims

1. A charging device for a portable phone battery for charging a rechargeable battery housed in a portable phone comprising:

a first charging section to charge said rechargeable battery housed in the portable phone; and

a second charging section to charge a lithium-ion battery built in said first charging section;

wherein said first charging section comprises;

an input terminal connected to said second charging section;

said lithium-ion battery connected to said input terminal via a protecting circuit;

a boosting-type DC/DC (Direct Current/Direct Current) converter to boost a voltage output from said lithium-ion battery;

a current limiting circuit to control a direct current fed from said boosting-type DC/DC converter and to prevent flowing of currents exceeding currents required for an activation of a current protecting circuit in the portable phone;

an output connector connected to said current limiting circuit and to have an electrode to supply a direct current voltage and direct current fed from said boosting-type DC/DC converter to a charging circuit of the portable phone; and

a control circuit to switch on-off said boosting-type DC/DC converter and said current limiting circuit;

wherein said second charging section comprises an AC (Alternating Current) adaptor connector to be used for charging said portable phone and connected to an AC adaptor to convert an alternating current into a direct current having a predetermined voltage and current;

a charging circuit to charge said lithium-ion battery by using a direct current voltage and direct current fed from said AC adaptor as inputs at constant current and voltage methods;

a current backflow preventing circuit connected to an input side of said charging circuit;

an output terminal connected to said first charging section used to charge said lithium-ion battery by using said charging circuit; and

an output connector to output a direct current voltage and direct current fed from said AC adaptor; and

wherein said second charging section and said first charging section are freely detachable and attachable from or to each other and are disconnected from each other.

2. The charging device for the portable phone battery according to claim 1, wherein said boosting-type DC/DC converter supplies a direct current voltage being higher than a voltage usable for charging a portable phone and being lower than a voltage activating a voltage protecting circuit of a portable phone and a direct current being larger than a maximum consuming current and being smaller than a current activating said current protecting circuit of a portable phone to a charging circuit of a portable phone.

3. The charging device for the portable phone battery according to claim 1, wherein said control circuit detects a voltage of said lithium-ion battery to switch on said boosting-type DC/DC converter and said current limiting circuit when a voltage of said lithium-ion battery is within a voltage range from a level usable for charging the portable phone to a level or lower activating said protecting circuit against overcharge of said lithium-ion battery and to switch off said boosting-type DC/DC converter and said current limiting circuit when a voltage of said lithium-ion battery is within a voltage range from a level being higher than a level activating said protecting circuit used to prevent overdischarge and to a level being lower than a level reaching discharge terminating and starting.

4. The charging device for the portable phone battery according to claim 2, wherein said control circuit detects a voltage of said lithium-ion battery to switch on said boosting-type DC/DC converter and said current limiting circuit when a voltage of said lithium-ion battery is within a voltage range from a level usable for charging the portable phone to a level or lower activating said protecting circuit against overcharge of said lithium-ion battery and to switch off said boosting-type DC/DC converter and current limiting circuit when a voltage of said lithium-ion battery is within a voltage range from a level being higher than a level activating said protecting circuit used to prevent overdischarge and to a level being lower than a level reaching discharge terminating and starting.

5. A charging device for a portable electronic device battery for charging a rechargeable battery housed in a portable electronic device comprising:

a first charging section to charge said rechargeable battery housed in the portable electronic device; and

a second charging section to charge a lithium-ion battery built in said first charging section;

wherein said first charging section comprises;

an input terminal connected to said second charging section;

said lithium-ion battery connected to said input terminal via a protecting circuit;

a boosting-type DC/DC (Direct Current/Direct Current) converter to boost a voltage output from said lithium-ion battery;

a current limiting circuit to control a direct current fed from said boosting-type DC/DC converter and to prevent flowing of currents exceeding currents required for an activation of a current protecting circuit in the portable electronic device;

an output connector connected to said current limiting circuit and to have an electrode to supply a direct current voltage and direct current fed from said boosting-type DC/DC converter to a charging circuit of the portable electronic device; and

a control circuit to switch on-off said boosting-type DC/DC converter and said current limiting circuit;

wherein said second charging section comprises an AC (Alternating Current) adaptor connector to be used for charging said portable electronic device and connected to an AC adaptor to convert an alternating current into a direct current having a predetermined voltage and current;

a charging circuit to charge said lithium-ion battery by using a direct current voltage and direct current fed from said AC adaptor as inputs at constant current and voltage methods;

a current backflow preventing circuit connected to an input side of said charging circuit;

an output terminal connected to said first charging section used to charge said lithium-ion battery by using said charging circuit; and

an output connector to output a direct current voltage and direct current fed from said AC adaptor; and

wherein said second charging section and said first charging section are freely detachable and attachable from or to each other and are disconnected from each other.

6. The charging device for the portable electronic device battery according to claim 5, wherein said boosting-type DC/DC converter supplies a direct current voltage being higher than a voltage usable for charging a portable electronic device and being lower than a voltage activating a voltage protecting circuit of a portable electronic device and a direct current being larger than a maximum consuming current and being smaller than a current activating said current protecting circuit of a portable electronic device to a charging circuit of a portable electronic device.

7. The charging device for the portable electronic device battery according to claim 5, wherein said control circuit detects a voltage of said lithium-ion battery to switch on said boosting-type DC/DC converter and said current limiting circuit when a voltage of said lithium-ion battery is within a voltage range from a level usable for charging the portable electronic device to a level or lower activating said protecting circuit against overcharge of said lithium-ion battery and to switch off said boosting-type DC/DC converter and said current limiting circuit when a voltage of said lithium-ion battery is within a voltage range from a level being higher than a level activating said protecting circuit used to prevent overdischarge and to a level being lower than a level reaching discharge terminating and starting.

8. The charging device for the portable electronic device battery according to claim 6, wherein said control circuit detects a voltage of said lithium-ion battery to switch on said boosting-type DC/DC converter and said current limiting circuit when a voltage of said lithium-ion battery is within a voltage range from a level usable for charging the portable electronic device to a level or lower activating said protecting circuit against overcharge of said lithium-ion battery and to switch off said boosting-type DC/DC converter and current limiting circuit when a voltage of said lithium-ion battery is within a voltage range from a level being higher than a level activating said protecting circuit used to prevent overdischarge and to a level being lower than a level reaching discharge terminating and starting.