Title:
DC POWER SUPPLY DEVICE
Document Type and Number:
Japanese Patent JPS6140623
Kind Code:
A
Abstract:
PURPOSE:To simplify the circuit of a DC power supply device by inputting the voltage at the connection point between series resistance circuits, which are connected to both ends of a reference power source, and the voltage of a current detecting resistance to a comparator and controlling the output of a power transistor with the output of the comparator. CONSTITUTION:If a switch S1 is connected as shown by a dotted line in the figure, the output of a comparator 3 supplies an output voltage V0 having a determined value to a load RL in preference to the output of a comparator 2 until an output current I0 reaches a set value; and after the current I0 reaches the set value, the output of the comparator 2 is preferred, and the voltage V0 is reduced in accordance with a drooping characteristic (dotted line). If the switch S1 is connected as shown by a solid line in the figure, a voltage V1 at a connection point P2 is increased and the value of the current I0 by which an input voltage Vin of the comparator 2 is zero is raised becase the current flowed to a resistance R3 is included in the current flowed to a resistance R1, and the potential at the connection point P2 and the current I0 are reduced together with the voltage V0, and a backward drooping characteristic (solid line) is shown. Thus, the drooping characteristic and the backward drooping characteristic are obtained by the switch to simplify the circuit.
Inventors:
ISHIKAWA YUICHI
IGARASHI HIROYUKI
IGARASHI HIROYUKI
Application Number:
JP16237784A
Publication Date:
February 26, 1986
Filing Date:
July 31, 1984
Export Citation:
Assignee:
TOKO INC
International Classes:
G05F1/56; G05F1/573; (IPC1-7): G05F1/573
Domestic Patent References:
| JP57084022B |