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Title:
CONTROL SYSTEM FOR ELECTRO-MAGNETIC PUMP
Document Type and Number:
Japanese Patent JPS5929779
Kind Code:
A
Abstract:

PURPOSE: To make it possible to stably control the output of an electro-magnetic pump, by utilizing a pulse current having a constant peak value and a constant period, and by changing the duty ratio of the pulse current.

CONSTITUTION: The terminal voltage, as a negative feed-back, of the emitter side of a transistor Q2 to which a resistor R9 is connected, is applied to the inversion input of a differential amplifier A through a resistor R10, and therefore, the crest value of a current applied to a transistor Q2 is always maintained at a constant value. Accordingly, a pulse current having a constant period (t) and a constant crest and as well having a duty ratio which is determined by the value of a variable resistor RV, is applied to a winding L, thereby the output of the electromagnetic pump may be stably controlled in accordance with the duty ratio.


Inventors:
TANAKA HITOSHI
KOJIMA TADASHI
Application Number:
JP13947082A
Publication Date:
February 17, 1984
Filing Date:
August 11, 1982
Export Citation:
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Assignee:
YAMATAKE HONEYWELL CO LTD
International Classes:
F04B17/04; F04B49/06; H02K33/00; (IPC1-7): F04B17/04; F04B49/06
Domestic Patent References:
JPS5569776A1980-05-26
Attorney, Agent or Firm:
Masaki Yamakawa