Title:
POWER SUPPLY DEVICE AND ELECTRIC APPARATUS USING IT
Document Type and Number:
Japanese Patent JP3292066
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To form the compact and inexpensive power supply device by setting a switching element in the cut-off state until the counter-electromotive force by an inductance element becomes the current value or less for specifying the forward-direction voltage of a flywheel diode.
SOLUTION: A switching element 3 and an inductance element 4 are connected in series between a voltage input terminal T1 and an output terminal T3. A monitoring circuit 6 detects the current flowing to the terminal T3 and prevents the fowling of the current higher than a specified value. The switching element 3 is turned on or off in accordance with the result of the current detection at a driving circuit 7 and the monitoring circuit 6. A flywheel diode 8 forms the path, through which the current caused by the counter-electromotive force of the inductor element 4 flows when the switching element 3 is turned off. Then, a characteristic improving circuit 9 sets the switching element in the cur-off state until the counter-electromotive force caused by the inductance element 4 becomes the current value or less for specifying the forward-direction voltage of the flywheel diode 9.
Inventors:
Hiroshi Hayashi
Application Number:
JP28196196A
Publication Date:
June 17, 2002
Filing Date:
October 24, 1996
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
H02J7/00; H02M3/155; (IPC1-7): H02M3/155; H02J7/00; H02M3/155
Domestic Patent References:
| JP3195357A | ||||
| JP59501094A |
Attorney, Agent or Firm:
Kaoru Sato
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