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Patent Searching and Data


Matches 651 - 700 out of 12,242

Document Document Title
WO/1998/028764A1
A safety relay for supervising and ensuring safe operation of a machine or an industrial process and corresponding safety devices and actuators has at least one input (In A, In B), which is monitored for short circuits and open circuits,...  
WO/1998/027566A1
In an external cardiac defibrillator (8), a method and system for determining when a relay (22) has failed in a conductive state. The defibrillator (8) includes a charge circuit (14) that charges an energy storage capacitor (C) to a pred...  
WO/1998/024106A1
A solenoid driver (10) capable of detecting the operational status of a solenoid (12) including the position of an armature within a solenoid coil and an operational method. The solenoid driver (10) generates a first solenoid current wit...  
WO/1998/024105A1
An electromagnet for an electrovalve comprises two connections (16, 18) to a voltage source, a rectifier (11, 12, 13, 14), of which each input is linked to one of the two connections (16, 18), a coil (24) situated between the direct curr...  
WO/1998/014788A1
The invention relates to an electrical circuit to detect load current for a clocked, controlled load having at least one inductive component associated to a free-wheeling circuit. The circuit comprises a shunt resistor whose voltage drop...  
WO/1998/013847A1
The invention concerns a circuit arrangement providing an electromagnetically operated mechanism of a switchgear with an electricity supply from a direct current supply device by means of an electronic switching device, which is released...  
WO/1998/011584A1
An electronic circuit (125), and corresponding method, for controlling the closing velocity of electrical switchgear (120), includes an actuator (120) and a current detection circuit (125) that detects whether an optimum amount of curren...  
WO/1998/010452A1
A load driving circuit in which an emergency switch for forced stoppage and a service switch for controlling current are connected in series with a load power-feeding circuit. An emergency switch (SW�A?) and a service switch (SW�B?) ...  
WO/1998/009802A1
An apparatus for automatically controlling the operation of a slide of a fail-safe press. The movement of the hands of a worker in/out of dangerous areas (D and D�N?) above the bolster of the press is detected on the basis of the outpu...  
WO/1998/003901A1
A current control apparatus capable of accurately and stably controlling a current, which is supplied to a controlled system, such as a coil of a solenoid, even when a control target value varies greatly at predetermined time intervals. ...  
WO/1998/001928A1
An electromechanical switching device (10) ensures automatic selected polarity interconnection between terminals of two power sources (14, 12). A double pole double throw (DPDT) switch (34) has three pairs of contacts. A first pair of le...  
WO/1997/050163A1
In a relay switching panel, a switching circuit operates to selectively connect resistive, capacitive, and inductive loads (LOAD) to a power source (POWER SOURCE) with substantially no arcing. The switching circuit comprises a pair of re...  
WO/1997/042641A1
The DC actuator control circuit (104) with voltage compensation, current control and fast dropout period employs an electronic chopper incorporating an oscillator (106) having a variable duty cycle controlled by sensing of coil current. ...  
WO/1997/040509A1
Device for controlling an inductive charge, particularly, of an electromagnetic coil, comprising a chopper switch in series with the coil and governed by a pulse width modulator, and an opening switch which is also mounted in series with...  
WO/1997/040508A1
A circuit arrangement for operating an electromagnet (14) from a direct voltage source (1, 2) contains a power supply device (5) operating in the manner of a switched-mode power supply and a capacitor (12) rated as an energy store. A con...  
WO/1997/037168A1
The invention concerns a protective circuit for monitoring an object which can move between two end positions, for example a displaceable safety door (1) of an electric machine. This type of protective circuit has a very simple and disti...  
WO/1997/036308A1
A solenoid device, for example in an electrical contactor system (26), is provided for use with an alternating current power source (24). An electrical contactor (26) includes an electromagnetic coil assembly (28) configured to generate ...  
WO/1997/030462A1
The invention relates to a control device which comprises a magnetic actuator (1), a final controlling element (2), a control unit (3) and a measuring device (4). The magnetic actuator (1) has a coil (10), a core (11), a spring (12) and ...  
WO1997021237A3  
WO/1997/029501A1
The invention relates to an electronic switch magnet control system for contactors, the contactor (2) having a travel sensor (3) used to determine the position of the armature (4). A measuring transducer (6) determines the actual current...  
WO/1997/029502A1
The invention relates to an electromagnetic switch magnet control system (1) for contactors (2). The contactor (2) has a coil (7) which drives switching contacts (5) via an armature (4) moving between an ON and OFF position. The switch m...  
WO1997021238A3  
WO/1997/028549A1
In order to establish the residual useful life of earth contacts, it has already been proposed to determine the so-called contact action at the breaker gap as a criterion for replacement in the event of contact erosion and to measure the...  
WO1997020224A3  
WO/1997/024790A1
A ground fault circuit interrupter, GFCI, interrupts the flow of current through a pair of lines (L, N) extending between a source of power and a load and includes a circuit breaker having a switch located in one of the pair of lines. Th...  
WO/1997/021237A2
Contactors or relays in particular generally have a magnet system comprising a coil with an armature and a yoke. A device has already been proposed for controlling the magnetic flux in the magnet system in a time-dependent manner accordi...  
WO/1997/021238A2
A contactor safety combination is proposed comprising two contactors (1, 3) and a mechanical locking component (5) coupled between the contactors. The latter can be standard commercial contactors of any size to allow switching of even hi...  
WO/1997/020224A2
A process and device are disclosed for testing a plurality of electric drives (1), in particular the drives of railway point mechanisms. Measurement values are simultaneously collected the plurality of electric drives and the signals tha...  
WO/1997/005637A1
Electronic drive circuitry for a solenoid that utilizes a pulse width modulation scheme is disclosed. The solenoid is connected in series with a transistor and a sense resistor. The voltage across the sense resistor is compared to a refe...  
WO/1997/000525A1
A circuit arrangement for operating an electromagnet (M) is provided with a clock generator (T) for delivering control pulses (SI, HI, AI) for an electronic switch connected in series with a coil (W) of the electromagnet (M). Once the el...  
WO/1996/042098A1
Switching equipment with a contactor (CE) and a circuit breaker (BR) located ahead of the contactor. For detection of welded-together contacts of the contactor, this is provided with means (SC) adapted, a certain time after an opening or...  
WO/1996/041358A1
A power disconnect switch (10) which employs a plurality of high current relays (RLY1-4) which are simultaneously activated by the application of a control signal to an attached control terminal (T3). By providing a plurality of relays (...  
WO/1996/038852A1
A solenoid operated remote resetting device with a protective solenoid activation circuit is disclosed. The device includes a housing for enclosing and protecting a solenoid with a movable plunger, a movable mechanical operator having an...  
WO/1996/036982A1
A current interrupter (4) includes a current interrupting device (4) having at least one movable contact (71); an actuator (8) coupled to the movable contact (71) of the current interrupter (4); a feedback sensor (14) for monitoring move...  
WO/1996/032734A1
A bistable magnetic actuator which has an armature which is moveable between a first bistable position and a second bistable position, and which has a first driving coil for driving the armature from the first to the second bistable posi...  
WO/1996/030923A1
A solenoid relay driving circuit which generates an exciting signal for exciting a solenoid relay after confirming that a make contact of the solenoid relay is off. A forcedly operated type solenoid relay (4) where a make contact (4A) an...  
WO/1996/026528A1
The new circuit has a control circuit (34), in which a switching element (2) and a measurement resistance (3) are connected in series to the contactor coil (1). A pick-up current regulating circuit (24) taps the voltage at the measuremen...  
WO/1996/024149A1
The invention relates to circuitry for the engagement relay for a starting device of an internal combustion engine with an auxiliary relay actuating a relay coil of the engagement relay. There is a control and/or regulating circuit (16) ...  
WO/1996/016422A1
In the protective safety combination according to the invention, two safety or emergency shutdown contacts (Kb1, Ka2 or Ka1, Kb2) are connected upstream or downstream of the coils (a, b) of two auxiliary contactors. A capacitor (7) lying...  
WO/1996/012098A1
A control valve (16) of an engine fuel system includes a valve member which is coupled to an armature (17) and is moved to engage a seating when a winding (18) is energised. The current flow in the winding is first allowed to rise to a p...  
WO/1996/011488A1
A line powered supply for a wall mounted lighting load control system includes a power MOSFET in series with a load control relay and a second MOSFET in parallel with the load control relay. When the lighting load is off, the MOSFET in p...  
WO/1995/034754A1
Described is a method and device for controlling an electromagnetic consumer which includes a moving element, in particular a solenoid valve, for control of the fuel feed into an internal-combustion engine. Within a particular time windo...  
WO/1995/029498A1
An improved economizer for DC actuator coil current control in spring-biased DC actuators is accomplished by control of power from a voltage source Vs to an actuator coil circuit by a chopper circuit (104) incorporating a switch S1 in th...  
WO/1995/028729A1
The invention relates to a remote control device for mobile and stationary concrete pumps. The remote control device has a central control device (10) to control groups and signalling units of the concrete pump and a remote control appli...  
WO/1995/022160A1
A brake pressure control mechanism for establishing a pressure level in a brake actuator includes a valve controlled by the current in a solenoid coil. The current in the coil is controlled in a first mode by switching the current in the...  
WO/1995/014162A1
A system (1) presenting a number of actuator circuits, each including a capacitor (C1), and a first controlled switch (SWi) interposed between the coil of an injector (Li) and a reference line, for permitting supply of the injector (Li) ...  
WO/1995/014304A1
This circuit detects ON failure of a switching element for controlling the power supply to a load, and shuts down the load current reliably. The circuit comprises a monitoring sensor which generates an output when energy is externally su...  
WO/1995/013906A1
A safety reset device for use together with personal safety protection device comprises two reset channels (1, 2) and a reset switch (3) common to the reset channels. Each reset channel comprises in series a reset circuit (11, 21) genera...  
WO/1995/002254A1
A device for preventing welding of the switch contacts of a heavy duty electromechanical relay comprises means (15, 16 and 17) adapted in use for monitoring the voltage supply to the relay coil (2) and detecting low voltage excursions th...  
WO/1995/000966A1
Electronic driving components sized to drive switching contactors of a determined power class are generally used. The object of the invention is to create a process and circuitry which allow contactors of different power classes to be dr...  

Matches 651 - 700 out of 12,242