CIRCUIT FOR DRIVING LOAD - NIPPON SIGNAL CO LTD

Title:

CIRCUIT FOR DRIVING LOAD

Document Type and Number:

WIPO Patent Application WO/1993/014506

Kind Code:

A1

Abstract:

A circuit for driving a load wherein the breaking mechanism for breaking a main power supply when a failure occurs is a fail-safe one. The circuit can drive an inductive load, saving power. The circuit also is improved in delay of its operation stop. The breaking mechanism is of a contactless one. In a feeding circuit for fedding power to the load, interposed is a means for sensing failure of semiconductor switching elements which perform the ON/OFF control of the power-feed to the load. The breaking mechanism is operated by the output of the failure sensing means. When driving an inductive load, two power supplies for feeding power to the load are interposed in the feeding circuit. Upon generating a signal for commanding the feeding circuit to drive the load, a high voltage is applied to the load by the two power supplies; and after a predetermined time, one of the two power supplies is stopped. In a stationary operation, a low voltage is applied to the load, feeding the power by one power supply, utilizing the signal for commanding the feeding circuit to drive the load, a pulse width modulation output is created. Using the output, power is fed to the load via a transformer. Thereby, when the load is driven stationarily, fed is a voltage lower than the voltage when starting the driving operation. Power for driving a load is saved, and the delay of operation stop is improved.

Inventors:

SAKAI MASAYOSHI (JP)
FUTSUHARA KOICHI (JP)

Application Number:

PCT/JP1993/000048

Publication Date:

July 22, 1993

Filing Date:

January 14, 1993

Export Citation:

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Assignee:

NIPPON SIGNAL CO LTD (JP)

International Classes:

H01F7/18; H01H47/32; (IPC1-7): H01F7/18

Foreign References:

JPH0314206A	1991-01-22
JPS5715708B2	1982-04-01

Other References: