Title:
WELDING EQUIPMENT
Document Type and Number:
WIPO Patent Application WO/2008/072387
Kind Code:
A1
Abstract:
Conventional welding equipment has such a problem that when a fuse or a circuit
breaker is not provided in the welding equipment, the fuse or circuit breaker
in a switchboard for supplying power to the welding equipment must have such a
value as can prevent burning of an apparatus in case of short circuit failure of
a semiconductor element, and the welding equipment cannot be protected when
a fuse or a circuit breaker having a higher value is used. Spreading of failure
is achieved through a simple arrangement with low cost by monitoring the voltage
of the semiconductor element, and interrupting an input power supply when the
voltage applied to the semiconductor element becomes zero or lower than a normal
voltage, thereby interrupting input power supply to the welding equipment.
Inventors:
TOCHINO MASAMITSU
UMEDA WATARU
UMEDA WATARU
Application Number:
PCT/JP2007/058793
Publication Date:
June 19, 2008
Filing Date:
April 24, 2007
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
TOCHINO MASAMITSU
UMEDA WATARU
TOCHINO MASAMITSU
UMEDA WATARU
International Classes:
B23K9/073; B23K9/06; B23K11/24
Foreign References:
| JPS6241837B2 | 1987-09-04 | |||
| JPH04294879A | 1992-10-19 | |||
| JPH069760U | 1994-02-08 | |||
| JPH06260048A | 1994-09-16 |
Attorney, Agent or Firm:
IWAHASHI, Fumio et al. (1006, Oaza Kadom, Kadoma-shi Osaka 01, JP)
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