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Patent Searching and Data


Matches 451 - 500 out of 4,729

Document Document Title
WO/1998/056095A2
Circuit protection systems employing arrangements of PTC devices and mechanical switches. The PTC device is not involved in the circuit until a fault is sensed. In one embodiment, a current sensing relay senses an overcurrent and directs...  
WO/1998/047213A1
Several partial discharge measuring probes (4, 5, 6) which detect electromagnetic signals from partial discharges are provided in a high-voltage installation. The corresponding measuring data is fed into an evaluation device (10) with a ...  
WO/1998/045920A1
An electrical safety device comprises a sensor strip (123) disposed in the insulation (121) of an electrical power cord (101) or other electrical apparatus. The sensor strip is made of a conductive polymer with a positive temperature coe...  
WO/1998/039753A1
A system monitors and controls external utilities interacting with a site to mitigate hazards during disaster or other emergency situations. Upon the occurrence of a disaster or other emergency event, the system disconnects the external ...  
WO/1998/035441A1
The invention relates to a controllable switching device comprising at least one switch which has at least one active zone to be protected against electric and/or thermal overload. Said switching device has at least one load circuit and ...  
WO/1998/035419A1
The invention relates to a circuit breaker, which is in a fault situation arranged to disconnect an electrical apparatus, such as a distribution transformer, from an average voltage network or a high voltage network at each terminal. At ...  
WO/1998/035440A1
The invention relates to an arrangement and method for measuring the temperature of a component, in particular of a contactless switch, whereby a transistor or diode is used as a temperature sensor.  
WO/1998/026487A1
A device (1) for supplying electric power to a load (4) connected to the device (1) in a power-on mode comprises a driver stage (7), a control unit (9), adapted to supply turn-on pulses to the driver stage (7), and an output stage (12) w...  
WO/1998/024161A1
An apparatus and method for the avoidance of electrical shock in an electrical system. For a two wire appliance, the device consists of a current interrupting circuit that bidirectionally impedes current flow for short time intervals in ...  
WO/1998/016778A1
A lamp (10) incorporating one or more safety features for reducing the risk of fire or heat damage associated with improper operation of the lamp (10). One safety feature can be an automatic safety switch (20) for terminating power to th...  
WO/1998/010301A1
A loss-less current sensing driver and method includes providing current (603) to a load (113) from a power supply (115) through a transistor (101). A voltage drop is measured (605) across the transistor (101) responsive to the provision...  
WO/1998/002946A1
An overcurrent protection system which will give a rapid response to even relatively small overcurrents. A sensor element, e.g. a resistive element, and a circuit interruption element, e.g. a set of relay contacts, are placed in series w...  
WO/1998/000620A1
An electric switch has a signal generator (1) which causes a switching function when a closed circuit is interrupted. A relay-safety combination (2) is connected into the closed circuit and the electric input and output lines between the...  
WO/1997/042512A1
An abnormality detection apparatus includes a receiver (3; 3A; 3B) for receiving microwaves (2, 8) emitted from objects (1; 1A; 1B; 1C; 1D; 1E; 1F); a detector (4) connected to the receiver (3; 3A; 3B), for converting the microwaves (2, ...  
WO/1997/026687A1
The invention concerns a socket (1) in which a switching device (11) switches voltage from the supply side (3) through to the consumer side (4) only when a consumer (2) is provided. A measuring device (5), which is supplied with power, c...  
WO/1997/012379A1
A method for preventing explosions and fires in an electrical transformer (1) with a tank (2) filled with an inflammable coolant (7), wherein a break in the electrical insulation of the transformer (1) is sensed using a pressure sensor m...  
WO/1997/012174A1
A method and a device for sensing the distance between a first object and a second object so as to activate or facilitate predetermined actions when the distance has attained a certain value. A person (1) (first object) holds a handle (2...  
WO/1997/011582A1
The invention concerns a thermally-protected control apparatus containing electrical components, in particular for controlling high-pressure gas-discharge lamps in motor vehicle headlights. According to the invention, electrical componen...  
WO/1996/042131A1
A household electrical service (10) is protected against overheating by running a sensor line or wire (36 or 38), coextensively together with hot, neutral and ground lines or wires (12, 13, 14 or 31, 32, 33), from a power company hookup ...  
WO/1996/037955A1
The invention relates to an integrated circuit with a power transistor (T1, T2, T3) and a temperature-dependently operating circuit (14) thermally coupled to the power transistor. There is a pnp or npn transistor (T5), the off-state curr...  
WO/1996/034450A1
A method and a device for protecting regenerating resistor by which a regenerating resistor is sufficiently protected from thermal damage caused by excessive regeneration by using both a thermostat and an analog simulation circuit in coo...  
WO/1996/030992A1
A hybrid alternator comprising a stator (702) and a rotor (710) mounted for rotation within the stator and separated therefrom by an air gap. The rotor has a rotor core defining a plurality of magnetic poles (716) wherein adjacent ones o...  
WO1996007192A3  
WO/1996/010284A1
The base of a thermal shutdown bipolar transistor (Q6) having a VBE(on) which decreases with increasing temperature is biased with a bias voltage VPTATbias which increases proportionally with increasing absolute temperature. By supplying...  
WO/1996/007192A2
Switching devices may have means for contactlessly detecting their position. According to the invention, to recognise the switching position there are magnetic field sensors arranged at a suitable point inside and/or outside the device h...  
WO/1996/000457A1
An electrical safety device for controlling the supply of power from a power supply such as a mains power supply to an appliance, such as an electrical powered lawnmower, is disclosed. The safety device comprises means for monitoring the...  
WO/1995/031028A1
A detector for monitoring the integrity of a ground connection to an electrical appliance having live and neutral terminals for feeding current to the appliance from respective live and neutral feeders of an electrical supply having a gr...  
WO/1995/026586A1
A fault current safety switch has a thyristor (1) which when ignited simulates a fault current in a summing current transformer (5). An ohmic resistance (2) and a PTC resistance (3) interconnected in series are connected in parallel to t...  
WO/1995/024757A1
An electrical safety device (3) is disclosed which utilizes a sensor conductor (16) configured in a continuous loop and disposed in an electrical component (12) so as to sense overtemperature or mechanical damage over a length or wide ar...  
WO/1995/020307A1
A heater for a heating pad uses heating elements of positive temperature coefficient (PTC) material arranged in parallel between a conductor connected through a fuse (5) to an ungrounded pole of electric a.c. mains and a conductor connec...  
WO/1995/017032A1
A clocked current supply has a fault current detector (32) that evaluates a voltage drop occurring at an ohmic measurement resistance (25) and supplies a switching-off signal (40) to a clocked voltage transformer (5). The ohmic measureme...  
WO/1995/006350A1
A magnetic thermal shutdown for use in a power converter comprising a pair of switching elements connected in a bridge mode configuration; a control device for controlling the switching operation of the switching elements; a resonant net...  
WO/1994/028608A1
In response to the loss of a generator in an electrical power system, all operating electrical loads are automatically switched to a second generator, and the electric power system continues to provide power to all of the loads. The tota...  
WO/1994/027348A1
Method for making an electrical power distribution point safe, particularly an electrical socket (1), in an electrical power supply system (2). Initially the output port (3) of the distribution point is not live and a monitoring sequence...  
WO/1994/019854A1
An electrical supply safety plug (202) that prevents power from a mains electrical supply (204, 206, 208) from being accessible to an electrical appliance (214) unless the electrical supply safety plug is properly engaged with the socket...  
WO/1994/017573A1
An electrical supply safety socket (200) that prevents power from a mains electrical supply (12, 14, 16) to be accessible at the outlets of the socket (18, 22, 20) unless an electrical appliance is properly engaged with the socket outlet...  
WO/1994/011939A1
A safety shut-off switch assembly (22) is provided for deenergizing power supplied to a plurality of wall panels (10 and 12) which are electrically coupled together and configured to form a plurality of office cubicles. The safety shut-o...  
WO/1994/011937A1
The present invention provides a current limiting short-circuiting protector which utilizes an electronic and thermal feedback principle for achieving precise and rapid release of the protector, which can be readily reset. The principle ...  
WO/1994/000901A1
An overtemperature sensing and signaling circuit for electronic trip units includes a voltage divider (16) and a trigger circuit (18). The voltage divider is formed of a first resistor (R1) and a positive coefficient resistor (PT1). The ...  
WO/1993/010586A1
A personnel protection system for electrical connections is disclosed, which is of the type that differentially senses the current flow between the power lead (50) and the return lead (52) (or between two power loads) is provided with an...  
WO/1993/001640A1
An electrical appliance (1) is protected against overheating by the provision of a plurality of series-connected, auto-reset type thermal cut-outs (2) each located in the appliance in the region of a potential hot-spot, and by the provis...  
WO1992013379A3  
WO/1992/013379A2
Security and electric protection systems. Basically, they are comprised of electronic circuits for measuring and/or comparing and/or actuating. One of those systems detects the short-circuit and neutralizes it. Another of those systems a...  
WO/1992/010032A1
A temperature-control system includes an integrated circuit (14) and a sequence controller (12) therefore, wherein the sequence controller (12) provides instructions and/or data to the integrated circuit (14) which performs operations ac...  
WO/1992/009129A1
An electrical safety device acting as a contact potential limiter and combined with a current limiter via a differential relay (49) controlling a device for cutting off the electrical supply (1) whenever critical current and fault voltag...  
WO/1992/002064A1
A sensing conductor (62) and a detection circuit (59, 60, 61, 63) cause a low resistance shorting of an appliance circuit (57, 58) in response to immersion in water or other electrically conductive liquid, and an interrupter device (4, 5...  
WO/1991/020116A1
A deliberately undersized power conditioner circuit (35) for high peak power, low duty cycle equipment (31). The circuit may be connected with a thermal switch (54) to shut off the power if the transformer (36) gets too hot. The transfor...  
WO/1991/017596A1
A loss of neutral or ground protection circuit is disclosed which uses a simple capacitive circuit (C2, C6) which discharges through the neutral (3) or ground leads (4) in normal conditions, and in the event of loss of neutral or ground ...  
WO/1990/009693A1
A safety device for minimizing electrical shock to a user is taught. Briefly stated, a ground plane (30) is disposed inside an electrical tool (10) or device. Should the tool (10) become immersed in water or become unreasonably wet, the ...  
WO/1990/009694A1
A protection device (1, 10) for connection between an electrical supply and electrical apparatus includes a circuit breaker to interrupt the supply when an open neutral or live conductor is detected. The protection device includes means ...  

Matches 451 - 500 out of 4,729