Title:
クランプ回路を備えた電圧レギュレータ
Document Type and Number:
Japanese Patent JP4169155
Kind Code:
B2
Abstract:
A circuit for clamping a voltage across a switching element to a value equal to or less than the sum of the input voltage plus the voltage across a clamping capacitor is provided. The circuit achieves voltage clamping accordance with one embodiment in which an active clamp circuit includes a switch and a clamping capacitor connected in parallel with a first winding of a coupled winding. The active clamp prevents the occurrence of voltage spikes across the switch. The clamping capacitor recovers energy stored in the first winding of the coupled winding. The circuit achieves voltage clamping in accordance with a second embodiment in which a passive clamp circuit includes a switch a clamping capacitor,and first and second diodes. The passive clamp circuit prevents the occurrence of voltage spikes across the switch. The clamping capacitor recovers energy stored in the first winding of the coupled winding.
Inventors:
Jin Long, Kian
Application Number:
JP2003525978A
Publication Date:
October 22, 2008
Filing Date:
August 21, 2002
Export Citation:
Assignee:
NXP B.V.
International Classes:
H02M3/137; H02M1/34; H02M3/155
Domestic Patent References:
| JP9233808A | ||||
| JP62262655A |
Foreign References:
| US6069803 | ||||
| US6097614 | ||||
| US6239993 |
Attorney, Agent or Firm:
Kenji Yoshitake
Hidetoshi Tachibana
Takeshi Sekine
Takahashi
Hidetoshi Tachibana
Takeshi Sekine
Takahashi
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