Hybrid power supply system

• US 20030222502A1
• Filed: 05/29/2003
• Published: 12/04/2003
• Est. Priority Date: 05/30/2002
• Status: Abandoned Application

• Current Assignee: NEC Tokin Corporation (Yageo Corporation)
• Original Assignee: NEC Tokin Corporation (Yageo Corporation)
• Inventors: Takahashi, Shingo, Hasebe, Akio, Mori, Kazuya
• Application Number:
  US10/448,479
• Publication Number:
  US 20030222502A1
• Time in Patent Office: Days
• US Class Current: 307/18
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 50/40 using propulsion power supplied by capacitors
• CPC Class Codes: B60L 58/10 for monitoring or controlling batteries
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02M 3/1582 Buck-boost converters H02M3/1584 takes precedence
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

In a hybrid power supply system which includes an electric double layer capacitor (10) having a pair of capacitor terminals (11 and 12), an energy storage (70a), and first and second bidirectional DC/DC converters (30a and 30b), the above-mentioned pair of capacitor terminals of the electric double layer capacitor are connected to a load (60a) through the first bidirectional DC/DC converter and are connected to the energy storage through the second bidirectional DC/DC converter.

Claims

1. A hybrid power supply system comprising:

an electric double layer capacitor (10) having a pair of capacitor terminals (11 and 12), an energy storage (70a), and first and second bidirectional DC/DC converters (30a and 30b), wherein said pair of capacitor terminals of the electric double layer capacitor are connected to a load (60a) through said first bidirectional DC/DC converter and are connected to said energy storage through said second bidirectional DC/DC converter.

2. A hybrid power supply system as claimed in claim 1, wherein at least one of said first and said second bidirectional DC/DC converters is a symmetrical DC/DC converter which comprises an inductor (31) having a pair of inductor terminals and a pair of switching portions (32 and 33) connected to said pair of inductor terminals to be symmetrical with each other with respect to said inductor, said symmetrical DC/DC converter being operable as every one of a step-up converter and a step-down converter when a particular one and a remaining one of said pair of switching portions serve as an input switch and an output switch, respectively, said symmetrical DC/DC converter being also operable as every one of said step-up converter and said step-down converter when said particular one and said remaining one of the pair of switching portions conversely serve as said output switch and said input switch, respectively,

3. A hybrid power supply system as claimed in claim 1, wherein said load comprises a power generator (90).

4. A hybrid power supply system as claimed in claim 1, wherein said energy storage comprises a secondary battery (80).

5. A hybrid power supply system as claimed in claim 1, wherein said electric double layer capacitor comprises a plurality of electric double layer capacitors (10′

) connected in series, said system further comprising a voltage balancing unit (20) for balancing respective voltages of said plurality of electric double layer capacitors connected in series.

6. A hybrid power supply system as claimed in claim 1, further comprising:

an additional energy storage (70b) and an additional bidirectional DC/DC converter (30b′

), said pair of capacitor terminals of the electric double layer capacitor are also connected to said additional energy storage through said additional DC/DC converter.

7. A hybrid power supply system as claimed in claim 1, further comprising:

an additional bidirectional DC/DC converter (30a′

), said pair of capacitor terminals of the electric double layer capacitor are also connected to an additional load (60b) through said additional DC/DC converter.