Title:
ELECTRIC SOURCE CIRCUIT DEVICE
Document Type and Number:
Japanese Patent JPS6434176
Kind Code:
A
Abstract:
PURPOSE: To protect a power supply circuit surely by making a forcible switching to a second control voltage obtained through an independent primary circuit by means of the control terminal of a control circuit upon missing a control voltage acting on the primary. CONSTITUTION: The power supply circuit comprises a circuit power supply section including a primary switching transistor (Tr) T1, a transformer 2, a control circuit 4 and a driver 5 for the Tr T1 wherein two working voltages U1, U2 are formed by means of a secondary winding 6 and two rectifier circuits 7, 8 on the secondary of the transformer 2. A control voltage Ur1 proportional to the voltage U1 is taken out from a potentiometer 9 and fed to the base of a Tr 10 which serves as a modulator for delivering a pulse, subjected to amplitude modulation by the control voltage Url, to the winding 14 of a transformer 15. The modulated pulse is taken out from a winding 16 and used for amplitude modulating a pulse 18 from the control circuit 4 and stabilizing the working voltages U1, U2.
Inventors:
JIERAARU RIRII
YOOZEEIGUNACHIO RODORIGESU
YOOZEEIGUNACHIO RODORIGESU
Application Number:
JP17528488A
Publication Date:
February 03, 1989
Filing Date:
July 15, 1988
Export Citation:
Assignee:
THOMSON BRANDT GMBH
International Classes:
H02M3/335; H02M3/28; (IPC1-7): H02M3/28
Domestic Patent References:
| JPS52100916U | 1977-07-30 |
Attorney, Agent or Firm:
Toshio Yano (1 outside)