Title:
SWITCHING POWER SUPPLY DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/048680
Kind Code:
A1
Abstract:
The snubber energy in a power switching element of a switching power supply device is effectively regenerated.
The switching power supply device is configured such that a DC voltage input from input terminals (1, 2) is once converted to an AC voltage of several tens to several hundreds of kHz by a power switching element (Q1) driven to turn on/off and a transformer (T1) and then the converted AC voltage is rectified by a diode (D5) and a capacitor (C5) to obtain a DC output at output terminals (3, 4). When the power switching element (Q1) is in the off-state, snubber energy is absorbed into a capacitor (C1) that is connected through a diode (D1) to a primary winding (n1). When the power switching element (Q1) is in the on-state, a series circuit of diodes (D2, D3) and an inductor (L1) is connected between the connection point between the capacitor (C1) and the diode (D1) and a common line (12), and in the next off-period of the power switching element (Q1), the snubber energy absorbed in the capacitor (C1) is regenerated between the common line (12) and a power supply line (11) through the inductor (L1).
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Inventors:
KITAGAWA Hiroshi (16-10, Hon-Haneda 2-chom, Ohta-ku Tokyo 11, 〒1448611, JP)
Application Number:
JP2009/068171
Publication Date:
April 28, 2011
Filing Date:
October 22, 2009
Export Citation:
Assignee:
ETA ELECTRIC INDUSTRY CO., LTD. (16-10, Hon-Haneda 2-chome Ohta-ku Tokyo, 11, 〒1448611, JP)
イーター電機工業株式会社 (〒11 東京都大田区本羽田２丁目１６番１０号 Tokyo, 〒1448611, JP)
イーター電機工業株式会社 (〒11 東京都大田区本羽田２丁目１６番１０号 Tokyo, 〒1448611, JP)
International Classes:
H02M3/28; H01F27/28
Attorney, Agent or Firm:
OTA Keiichi (Toranomon Bldg. 9F, 1-12 Toranomon 1-chome, Minato-ku Tokyo 01, 〒1050001, JP)
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