Title:
SWITCHING POWER CIRCUIT AND CONTROL METHOD USED FOR SWITCHING POWER CIRCUIT
Document Type and Number:
Japanese Patent JP3761558
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce switching loss in a switching power circuit.
SOLUTION: When a switching element 33 changes from an on-state to an off-state, a capacitor 35 is charged, and a rising of voltage becomes gentle as compared with the falling of a current passed through the switching element 33. As a result, the switching loss is reduced. When the switching element 33 changes from the off state to the on state, a diode 34 has been already in the on-state. Therefore, zero-voltage switching takes place, and the switching loss is reduced. When an auxiliary switching element 39 changes from the on-state to the off-state, an auxiliary capacitor 41 is charged, and a rising of voltage becomes gentle as compared with the falling of a current passed through the auxiliary switching element 39. As a result, the switching loss is reduced. When the auxiliary switching element 39 changes from the off-state to the on-state, an auxiliary diode 40 has been already in the on-state. Therefore, zero-voltage switching takes place, and the switching loss is reduced.
Inventors:
Masaki Natori
Application Number:
JP2004132146A
Publication Date:
March 29, 2006
Filing Date:
April 27, 2004
Export Citation:
Assignee:
NEC Computer Techno Co., Ltd.
International Classes:
H02M3/155; H02M7/12; (IPC1-7): H02M3/155; H02M7/12
Domestic Patent References:
| JP7203673A | ||||
| JP2002095243A |
Attorney, Agent or Firm:
Seisei Nishimura
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