Title:
POWER SOURCE CIRCUIT WITH BACKUP FUNCTION
Document Type and Number:
Japanese Patent JPH01186135
Kind Code:
A
Abstract:
PURPOSE:To obtain a backup compensating function by a capacitor of a less electrostatic capacity than a conventional one by transmitting charge obtained from a power source to charge storage means by charge supply means having no intrinsic threshold level of an element at a forward voltage drop. CONSTITUTION:A series circuit of a resistor 11 and a capacitor 12 is connected to the anode of a diode 13. Thus, the capacitor 12 is completely charged to a stabilized power source voltage V2. When a stabilized power source 10 is normally operated, a load 15 is energized by a load current I13 from the diode 13 at a load voltage V3. Assume now that the power source 10 is defective so that the voltage V2 is dropped to zero. Then, the current I13 does not flow. Insteads, a backup current I14 from the capacitor 12 charged up to an output voltage corresponding to the output from the power source 10 flows through a diode 14 to the load 15.
Inventors:
HIGA OSAMU
HIROSE SHUNICHI
HIROSE SHUNICHI
Application Number:
JP792288A
Publication Date:
July 25, 1989
Filing Date:
January 18, 1988
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
H02J1/00; G05F1/46; H02J9/06; (IPC1-7): G05F1/46; H02J1/00; H02J9/06
Domestic Patent References:
| JPS4941168B1 | 1974-11-07 |
Attorney, Agent or Firm:
Takehiko Suzue (2 outside)