Title:
SWITCHING POWER SUPPLY CIRCUIT
Document Type and Number:
Japanese Patent JP2007236112
Kind Code:
A
Abstract:
To provide a switching power circuit capable of avoiding shutdown due to insufficient charging time of a floating power supply voltage, using a simple circuit configuration.
The difference between an input voltage from a DC power supply V2 and a switching output voltage of FET1 charges a voltage clamped by a Zener voltage of a Zener diode D5 into a capacitor C6 of a backup power circuit 4. The electricity charged into a capacitor C1 is consumed by the switching operation of FET1; and when the voltage of the capacitor C1 is lower than a predetermined voltage, a diode D3 is turned on, and power is fed from the capacitor C6 to a gate drive circuit 2.
COPYRIGHT: (C)2007,JPO&INPIT
Inventors:
KONDO HIKARI
Application Number:
JP2006054892A
Publication Date:
September 13, 2007
Filing Date:
March 01, 2006
Export Citation:
Assignee:
VICTOR COMPANY OF JAPAN
International Classes:
H02M3/155
Domestic Patent References:
| JPH07222439A | 1995-08-18 |
Attorney, Agent or Firm:
Hidekazu Miyoshi
Shunichi Takahashi
Shunichi Takahashi