Power supply circuit

• US 6,320,278 B1
• Filed: 06/26/1998
• Issued: 11/20/2001
• Est. Priority Date: 06/30/1997
• Status: Expired due to Term

• Current Assignee: Tokin Corporation (Yageo Corporation)
• Original Assignee: NEC Corporation
• Inventors: Sakata, Kouji, Nishiyama, Toshihiko, Harada, Gaku, Kurihara, Junko
• Primary Examiner(s): FLEMING, FRITZ M
• Application Number:
  US09/105,000
• Time in Patent Office: 1,243 Days
• Field of Search: 307/109, 307/110, 307/43, 307/44, 307/64, 307/66, 307/85, 307/71, 307/62, 307/52, 307/53, 307/80, 307/140, 307/59, 307/63, 307/54
• US Class Current: 307/53
• CPC Class Codes: G06F 1/305 in the event of power-supply fluctuations
• CPC Class Codes: H01M 16/00 Structural combinations of different types of electrochemical generators
• CPC Class Codes: H01M 4/60 of organic compounds
• CPC Class Codes: H01M 4/606 containing aromatic main chain polymers
• CPC Class Codes: H01M 4/608 containing heterocyclic rings
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A power supply device of the present invention includes an electric double layer capacitor connected to, e.g., an HDD (Hard Disk Drive), CD-ROM (Compact Disk Read Only Memory) drive, floppy disk drive or similar motor-driven equipment, and another electric double layer capacitor connected to, e.g., a pulse generating device included in a radio transmitter. The capacitors each feed power when the load of the associated equipment sharply varies during operation of the equipment. This makes it needless for a main power supply to feed such power. A laminate polymer battery is connected to a low voltage IC (Integrated Circuit) and feeds power thereto. This also makes it needless for the main power to feed power to the low voltage IC, and allows a short feed line to connect the laminate polymer battery and IC. The short feed line reduces the transfer of noise to the IC and therefore malfunction ascribable to noise.

Claims

1. A power supply circuit, comprising:

a main power supply;

a first auxiliary power supply which supplies power to a first circuit having first load requirements that result when a change in load of said first circuit occurs; and

a second auxiliary power supply which supplies power to a second circuit having second load requirements, said second load requirements being less than said first load requirements,

wherein said first auxiliary power supply includes an electric double layer capacitor connected in parallel with said main power supply, said electric double layer capacitor dividing a current load of said first circuit between said electric double layer capacitor and said main power supply, and

wherein said second auxiliary power supply is connected to said main power supply and includes a battery having one of a positive pole and a negative pole formed of a conductive polymer.

2. A power supply circuit as claimed in claim 1, wherein the conductive polymer of said battery comprises a positive pole or a negative pole active substance selected from the group consisting of polypyrol, polyaniline, and polythiophene.

3. A power supply circuit as claimed in claim 1, wherein as a result of said electric double layer capacitor dividing the current load of said first circuit between said electric double layer capacitor and said main power supply, maximum capacity requirements of said main power supply are reduced by an amount sufficient to reduce a size of said power supply circuit.

4. A power supply circuit as claimed in claim 1, wherein said main power supply has a minimum output power capacity substantially greater than the second load requirements of said second circuit, said polymer battery supplying power to said second circuit so that energy of said main power supply is not dissipated as a result of a disparity between the minimum output power capacity of said main power supply and the second load requirements of said second circuit.

5. A power supply circuit as claimed in claim 1, wherein said electric double layer capacitor supplies power to said first circuit while said main power supply charges said electric double layer capacitor.

6. A power supply circuit as claimed in claim 1, wherein said second auxiliary power supply is connected to said second circuit by a feed line of a length sufficient to reduce noise from propagating from the second circuit.

7. A power supply circuit as claimed in claim 1, wherein the main power supply directly supplies power to at least a third circuit having third load requirements different from said first and second load requirements.

8. A power supply circuit comprising:

a main power supply;

an auxiliary power supply; and

a plurality of loads connected in parallel to said main power supply,

wherein at least one of said plurality of loads rapidly varies,

wherein said auxiliary power supply comprises a plurality of auxiliary power supplies connected in parallel to said main power supply and each being assigned to a particular load, and

wherein said main power supply and said plurality of auxiliary power supplies each take over a portion of a varying load current.

9. A power supply circuit as claimed in claim 8, wherein first one of said auxiliary power supplies supplies power to a first circuit having first load requirements that result when a change in load of said first circuit occurs, and

wherein a second one of said auxiliary power supplies supplies power to a second circuit having second load requirements, said second load requirements being less than said first load requirements.

10. A power supply circuit as claimed in claim 9, wherein said first auxiliary power supply includes an electric double layer capacitor connected in parallel with said main power supply, said electric double layer capacitor dividing a current load of said first circuit between said electric double layer capacitor and said main power supply, and

wherein said second auxiliary power supply is connected to said main power supply and includes a battery having one of a positive pole and a negative pole formed of a conductive polymer.

11. A handy electronic apparatus, comprising:

a plurality of loads; and

a power supply circuit which includes;

(a) a main power supply, and

(b) an auxiliary power supply, said plurality of loads connected in parallel to said main power supply,

wherein at least one of said plurality of loads rapidly varies,

wherein said auxiliary power supply comprises a plurality of auxiliary power supplies connected in parallel to said main power supply and each being assigned to a particular load, and

wherein said main power supply and said plurality of auxiliary power supplies each take over a portion of a varying load current.