Title:
SWITCHING POWER SUPPLY AND ITS DRIVING METHOD
Document Type and Number:
WIPO Patent Application WO/2003/049271
Kind Code:
A1
Abstract:
A switching power supply comprises an ac-dc converter circuit (3) having a power-factor improving function, a dc-dc converter circuit (4) connected to the ac-dc converter circuit (3), a control circuit (5), and a control power supply circuit (6). The control circuit (5) includes a circuit for judging whether or not the output voltage Eo of the ac-dc converter circuit (3) is higher than a predetermined level and a circuit for starting supply of power to a switch control circuit for the dc-dc converter circuit (4) when the output voltage Eo of the ac-dc converter circuit (3) becomes higher than the predetermined level. The output voltage Vo of the dc-dc converter circuit (4) rises stably at the start-up.
Inventors:
YAMADA TOMOYASU (JP)
SIMADA MASAAKI (JP)
SIMADA MASAAKI (JP)
Application Number:
PCT/JP2002/012589
Publication Date:
June 12, 2003
Filing Date:
December 02, 2002
Export Citation:
Assignee:
SANKEN ELECTRIC CO LTD (JP)
YAMADA TOMOYASU (JP)
SIMADA MASAAKI (JP)
YAMADA TOMOYASU (JP)
SIMADA MASAAKI (JP)
International Classes:
H02M3/28; H02M3/335; H02M7/12; (IPC1-7): H02M7/12; H02M3/28
Foreign References:
| JPH0686537A | 1994-03-25 | |||
| JPH07274528A | 1995-10-20 | |||
| EP0837549A2 | 1998-04-22 | |||
| JPH06339267A | 1994-12-06 | |||
| JPH10248255A | 1998-09-14 |
Attorney, Agent or Firm:
Takano, Noritsugu (5-8 Hyakunincho 2-chom, Shinjuku-ku Tokyo, JP)
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