LOAD DRIVING CIRCUIT

The invention relates to a load drive circuit wherein an emergency shutdown switch for forcible interruption and a normal shutdown switch for normal current control are disposed in series in a load power supply circuit. An emergency shutdown switch (SWA) and a normal shutdown switch (SWB) are dispos...

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Bibliographic Details
Main Authors SAKAI, MASAYOSHI, FUTSUHARA, KOICHI
Format Patent
LanguageEnglish
French
German
Published 16.09.1998
Edition6
Subjects
BASIC ELECTRIC ELEMENTS
BASIC ELECTRONIC CIRCUITRY
BLASTING
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
LIGHTING
MECHANICAL ENGINEERING
PERFORMING OPERATIONS
PRESSES
PRESSES IN GENERAL
PULSE TECHNIQUE
RELAYS
SAFETY DEVICES IN GENERAL
SELECTORS
THERMAL INSULATION IN GENERAL
TRANSPORTING
WEAPONS
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Summary:The invention relates to a load drive circuit wherein an emergency shutdown switch for forcible interruption and a normal shutdown switch for normal current control are disposed in series in a load power supply circuit. An emergency shutdown switch (SWA) and a normal shutdown switch (SWB) are disposed in series in a load power supply circuit. The normal shutdown switch (SWB) is periodically driven off for a short time by means of a control signal (X) from a normal shutdown switch control circuit (30), and the fact that this is off is monitored by an output signal (AC) from a monitor circuit (40). If the output signal (AC) is not generated for an off-delay time or more of an off-delay circuit (21), then a control signal (Z) for an emergency shutdown switch control circuit (20) is stopped thereby forcibly switching off the emergency shutdown switch (SWA).
Bibliography:Application Number: EP19970926238