Title: Electromagnetic control equipment for power supply circuit with current supply kept by electromagnet
Application Number: 99122868 Application Date: 1999.12.03
Publication Number: 1257291 Publication Date: 2000.06.21
Approval Pub. Date: 2004.10.06 Granted Pub. Date: 2004.10.06
International Classifi-cation: H01F7/18;H01H9/54;H01H33/59;H01H71/00
Applicant(s) Name: Schneider Electric SA Address:
Inventor(s) Name: Gueslein Durif
Attorney & Agent: sun lubeng
Abstract:
    The control device comprises a holding coil, an electronic switch and a power supply circuit connected in series to the terminals of a supply voltage of the coil. A circuit for measuring the holding current is connected in parallel with the power supply circuit and comprises in series an additional electronic switch and a measuring resistor. The power supply circuit is thus supplied by the holding current flowing in the coil and the additional electronic switch is periodically closed to measure the holding current which is regulated by a microprocessor-based circuit controlling the two electronic switches.
Time: 9
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