Circuit d'attaque d'une charge

Load driving circuit

Steuerschaltung für induktive Last

Abstract

This invention relates to a load driving circuit having a fail-safe breaking mechanism for breaking a primary power source when a failure occurs. This invention also relates to a load driving circuit capable of saving electricity in driving an inductive load and reducing a delay in stopping the load. The breaking mechanism for breaking the primary power source has no contact. The load driving circuit includes a power supply circuit involving a semiconductor switching element that turns ON and OFF the supply of power to the load. There is arranged a detector for detecting a failure in the semiconductor switching element. When detecting a failure, the detector provides an output signal to activate the breaking mechanism. To drive the inductive load, the power supply circuit may have two power supply sources. In response to a load driving instruction signal, the two power supply sources together apply a high voltage to the load. After a predetermined period, one of the power supply sources is stopped, and during a steady-state operation of the load, the remaining power source applies a low voltage to the load. The load driving instruction signal may be used to provide a pulse width modulated output, which is used to supply power to the load through a transformer. During a steady-state operation of the load, this arrangement supplies a voltage lower than an operation start voltage to the load, to thereby reduce power consumption and a delay in stopping the load.

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Patent Citations (3)

    Publication numberPublication dateAssigneeTitle
    DE-1235421-BMarch 02, 1967Rudolf Weber LichtsteuergeraetStromversorgungs- und Schalteinrichtung zur Schnellschaltung induktiver Gleichstromverbraucher
    DE-4010198-A1October 02, 1991Bosch Gmbh RobertVerfahren zum ueberwachen von induktiven lasten auf fehler
    JP-S59229806-ADecember 24, 1984Matsushita Electric Ind Co LtdPlunger drive circuit

NO-Patent Citations (1)

    Title
    PATENT ABSTRACTS OF JAPAN vol. 9, no. 102 (E-312) [1825] , 4 May 1985 & JP 59 229806 A (MATSUSHITA), 24 December 1984,

Cited By (0)

    Publication numberPublication dateAssigneeTitle