Portable power supply incorporating a generator driven by an engine

(54) PORTABLE POWER SUPPLY

INCORPORATING A GENERATOR DRIVEN
BY AN ENGINE

(75) Inventor: Mitsuo Fukaya, Shizuoka (JP)

(73) Assignee: Yamaha Hatsudoki Kabushiki Kaisha, Shizuoka (JP)

( * ) Notice: Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 189 days.

(21) Appl. No.: 10/393,683

(22) Filed: Mar. 20, 2003

(65) Prior Publication Data

US 2004/0008009 Al Jan. 15, 2004

(30) Foreign Application Priority Data

Mar. 20, 2002 (JP) 2002-078944

Mar. 26, 2002 (JP) 2002-086027

Mar. 29, 2002 (JP) 2002-094655

Apr. 22, 2002 (JP) 2002-118763

(51) Int. CI.7 F02N 11/00; F02N 11/04;

H02P 9/04; H02K 29/06

(52) U.S. CI 322/10; 322/14; 307/46;

307/67

(58) Field of Search 322/10, 14; 307/46,

307/48, 64, 67, 105

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(Continued)

FOREIGN PATENT DOCUMENTS

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JP 2934675 4/1999

JP 2000-278998 10/2000

Primary Examiner—Nicholas Ponomarenko

Assistant Examiner—Pedro J. Cuevas

(74) Attorney, Agent, or Firm—Knobbe, Martens, Olson &

Bear LLP

A portable power supply includes an engine-driven generator that generates a first AC power. A rectifier rectifies the first AC power to a first DC power. A DC/DC converter converts a second DC power from a storage unit to a third DC power. Acontroller selectively enables one or both ol the rectifier and the DC/DC converter to provide one or both ol the first DC power and the third DC power to the input ol an inverter. The inverter converts the DC power at its input to a second AC power. Alternatively, the power supply advantageously includes a second generator and a second rectifier. The outputs ol the two rectifiers are summed and the sum ol the two outputs is provided as an input the inverter to extend the range over which a constant second AC power can be provided.

27 Claims, 25 Drawing Sheets

U.S. PATENT DOCUMENTS

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* cited by examiner