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Title:
DRIVE CONTROL CIRCUIT FOR DISPLACEMENT PUMP AND THE DISPLACEMENT PUMP
Document Type and Number:
Japanese Patent JP2012026430
Kind Code:
A
Abstract:

To provide a displacement pump low in power consumption.

In the displacement pump 1, a diaphragm 12 that varies the volume of a pump chamber 8 is mounted to the moving body 33 of an electromagnetic direct-operated actuator 3. A drive control circuit 70 includes an H bridge circuit 73, a constant current control circuit 76 and a power saving circuit 77. When reciprocating the moving body 33, the H bridge circuit 73 changes directions of an excitation current supplied to a drive coil 38 between the time of outward moving and the time of returning. In each time of outward moving and returning, the constant current control circuit 76 gradually decreases the excitation current from a time when starting the excitation of the drive coil 38, to a first excitation current I1, and to a second excitation current I2 which is lower than the first excitation current I1. The power saving circuit 77 reduces the excitation current from the second excitation current I2 to zero. Thus, power consumption is reduced compared to the case of continuously supplying a constant current to the drive coil 38 while the moving body 33 is reciprocated.


Inventors:
KURITA YUKINOBU
Application Number:
JP2010282270A
Publication Date:
February 09, 2012
Filing Date:
December 17, 2010
Export Citation:
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Assignee:
NIDEC SANKYO CORP
International Classes:
F04B43/04; F04B43/02; F04B45/04; F04B45/047
Domestic Patent References:
JPS51150703A1976-12-24
JPH03293956A1991-12-25
JPS51150703A1976-12-24
JPH03293956A1991-12-25
Attorney, Agent or Firm:
Shiro Yokozawa
Shin Kodaira
Toru Kawai