Title:
SWITCHING POWER SUPPLY PORTION FOR REDUCING HIGHER HARMONIC LOAD IN POWER SUPPLY
Document Type and Number:
Japanese Patent JPH09331676
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To dispense with a switching transistor with an improved withstanding voltage, by connecting the junction between a choke and a diode with a constant-voltage point via a second diode to reduce the amplitude and interfering radiation of a voltage impulse. SOLUTION: A series circuit comprising a choke LH and a diode DH is interposed between a charging capacitor CN and a tap (A) of a primary winding W1. Further, a junction (D) between the choke LH and the diode DH is connected with a constant-voltage point (B) via a second diode DE. Thereby, the load of a switching transistor T1 which is generated in the choke LH by an induced impulse generated at the moment of turning off the switching transistor T1 is reduced considerably. Therefore, as the switching transistor T1, the use of any transistor with an improved withstanding voltage is dispensed with.
Inventors:
RAINHARUTO KEEGERU
JIYANNPOORU RUBUERU
JIYANNPOORU RUBUERU
Application Number:
JP6158797A
Publication Date:
December 22, 1997
Filing Date:
March 17, 1997
Export Citation:
Assignee:
THOMSON BRANDT GMBH
International Classes:
H02M3/28; H02M1/00; H02M1/12; H02M1/42; H02M3/335; H02M7/06; H02M7/12; (IPC1-7): H02M3/28; H02M7/06
Attorney, Agent or Firm:
矢野 敏雄 （外２名）
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