Title:
AUTOMATIC POWER CONTROLLER FOR INDUCTIVE LOAD
Document Type and Number:
Japanese Patent JPH01197819
Kind Code:
A
Abstract:
PURPOSE:To raise an energy saving effect by absorbing a difference current portion of a DC output current and a current flowing to a control winding, when a semiconductor switch is turned off, and generating an output signal being proportional to a load state of an inductive load. CONSTITUTION:When a semiconductor switch 88 is turned off, a current absorbing circuit 90 executes an action for absorbing a difference current portion of a DC output current of a rectifier 84 and a DC exciting current. A voltage control element 92 conducts when an exciting voltage reaches a voltage limited by the voltage control element 92, so that an overvoltage is not applied to the semiconductor switch 88 and the current absorbing circuit 90. A control circuit 34 responds to an output signal (f) of a load state detecting circuit 32, controls an exciting current I' by controlling a conduction ratio of the semiconductor switch 88, and adjusts an output voltage supplied to an inductive load 18 from a control reactor 24 so that the power factor becomes near '1'. In such a way, the inductive load 18 is always driven by optimum power in accordance with a load state, and a remarkable energy saving effect is obtained.
More Like This:
| JPS52118235 | DC VARIABLE VOLTAGE DEVICE |
| JPH01197820 | POWER SAVING CONTROLLER FOR INDUCTIVE LOAD |
Inventors:
HATANAKA TAKESHI
Application Number:
JP2128688A
Publication Date:
August 09, 1989
Filing Date:
February 02, 1988
Export Citation:
Assignee:
AREX DENSHI KOGYO KK
International Classes:
G05F1/32; (IPC1-7): G05F1/32
Domestic Patent References:
| JPS471942U | 1972-08-22 | |||
| JPS5468962A | 1979-06-02 | |||
| JPS622887A | 1987-01-08 | |||
| JPS6077697A | 1985-05-02 |
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