ONE-TRANSISTOR TYPE SWITCHING POWER SOURCE

Title:

ONE-TRANSISTOR TYPE SWITCHING POWER SOURCE

Document Type and Number:

Japanese Patent JPS6070972

Kind Code:

A

Abstract:

PURPOSE:To increase the withstanding margin of a switching transistor by absorbing a flyback energy by a capacitor. CONSTITUTION:When a switching transistor Q is turned OFF, energy stored in a choke coil L is smoothed through a commutation diode D4 by a choke L and a capacitor C2. The flyback energy stored in a transformer 2 is not discharged to the secondary side at the primary side when OFF, but particularly a spike voltage of the flyback energy is reduced by a capacitor Cx connected to the primary side of the transformer 2. Thus, the withstand voltage margin of the switching transistor can be increased, thereby improving the reliability.

Inventors:

OOISHI HIROTO

Application Number:

JP17642283A

Publication Date:

April 22, 1985

Filing Date:

September 26, 1983

Export Citation:

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Assignee:

RICOH KK

International Classes:

H02M3/335; (IPC1-7): H02M3/335

Domestic Patent References:

JPS5212416A	1977-01-31
JP57165091B

Attorney, Agent or Firm:

Kenjiro Take

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