Matches 1 - 50 out of 102 1 2 3 >
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7558037 Over current protection circuit and method  
Circuit and method for providing over-current and overloading protection with a single additional pin. A converter controller circuit is provided that includes a voltage controlled oscillator and...
7518838 Protection of variable frequency power systems from excessive peak electrical potentials  
A method of protecting an electromechanical power transfer system from excessive peak electrical potentials, the power transfer system comprising a prime mover, a dynamoelectric machine coupled to...
7511930 System and method for high voltage protection of powered devices  
A powered device includes a rectifier circuit, a logic circuit, and a power protection element. The rectifier circuit includes two inputs to receive an input voltage from a powered network and...
7507977 System and method of ion beam control in response to a beam glitch  
The present invention is directed to a switch circuit and method to quickly enable or disable the ion beam to a wafer within an ion implantation system. The beam control technique may be applied to...
7368768 Semiconductor integrated circuit device with protection capability for protection circuits from static electrical charge  
Semiconductor Integrated Circuit (IC) devices such as diode and MOSFET that protect circuits from Electrostatic Discharge (ESD) are formed. A diode is formed by an N+ (or P+) and P+ (or N+)...
7245470 Unsafe voltage shutoff control  
A circuit and device protects connected equipment from a broad range of unsafe conditions of over-voltage and under-voltage by disconnecting the line voltage before surge protection components,...
7085662 Power quality indicator  
There is provided a method and a power quality indicator coupled to an electrical circuit. The indicator comprises the summing device configured to received a sensed wave form from the electrical...
6947266 Power protection device  
A power protection device protects electronic equipment from AC supply system disturbances. An electronically controlled relay circuit passes power to connected equipment if the electrical supply...
6577479 Arc suppression circuit  
A circuit for suppressing electrical arcing in an ion beam source or other plasma devices is provided. The arc suppression circuit of this invention detects current rises on ion beam source grids...
6543673 Dissolving shunt connection system for ESD sensitive components  
A method and system are disclosed for protecting an electrical component from electrostatic discharge prior to its electrical connection to an additional component. Specifically, a flex on...
6452235 Floating body ESD protection circuit  
A floating body ESD protection circuit positioned between and coupled to an I/O pad and an internal circuit. A p-type depletion mode transistor is used to control the body of an n-type enhancement...
6366434 Apparatus for safely disconnecting an electrical load from an electrical DC voltage supply  
An apparatus for disconnecting an electrical load from an input DC voltage includes first and second lines which carry the input DC voltage to the electrical load. A fuse is connected in series in...
6295189 Protection for battery module with diode memory  
A battery module including at least one cell, at least one sensor, an interrupter device such as a fuse connected in series with the cells and an electronic switch. The electronic switch includes...
6222441 Process and circuit for connecting an actuator to a line  
An improved circuit and method for connecting a device to an actuator-sensor interface ("ASI") bus. The circuit provides the proper AC and DC coupling between the device and bus during normal...
6118639 Fast acting disconnect system for protecting surge suppressors and connected utilization equipment from power line overvoltages  
A fast acting disconnect system is incorporated with a transient voltage surge suppressor to protect the surge suppressor and the connected utilization equipment from power frequency overvoltages....
5939921 Drive circuit for a field-effect-controlled semiconductor component which opens a switch when a predetermined current is exceeded  
A drive circuit for a field-effect-controlled semiconductor component reduces a charging current for driving the field-effect-controlled semiconductor component when a load current limiting...
5812352 Circuit breaker tester  
Apparatus and method for opening circuit breakers in a circuit are disclosed. The apparatus includes input terminals adapted to be connected to the circuit, a switch and a load. When the apparatus...
5805394 Overvoltage protection circuit for a generating system utilizing a fault current sensing Circuit in combination with a shunting circuit  
An overvoltage protection circuit utilizes the fault current sensing capabilities of a differential protection circuit in combination with a shunting circuit to protect a power generating system...
5629570 Paint flow control interface  
Paint flow control interface circuitry for passing electrical signals across a paint booth barrier including a feedback signal indicating a paint flow parameter from a parameter transducer within...
5473494 Electrical power supply system  
An electrical power supply system includes an electrical power source system connected to a bus bar and a plurality of electric power transmission systems each connected via circuit breakers to the...
5408379 Device for opening a circuit and device for protecting the circuit against surges  
An insulating substrate has a heat generating resistor and an electrical conductor on its surface. A pair of conductors, such as power or communication leads, are connected to a protected circuit....
5402039 Non-automatic resetting thermal-protected ballast  
An embodiment of the present invention is a ballast for a high intensity discharge lamp that includes a non-automatically resetting thermal protector thermally coupled to a coil wound on a core and...
5400203 Short circuit detector and isolator  
An isolation circuit, which draws essentially zero current in a normal or stand-by state, uses a normally closed relay in combination with a storage element. A capacitor can be used as the storage...
5377067 Junction box with protection function to protect from overvoltage and overcurrent  
A junction box for the protection of electronic devices and communication lines from lightning surges, overcurrent and overvoltage. The box includes sockets for connection to the devices and liens...
5243487 Gravure press with crowbar circuit  
A gravure printing press with an electrostatic assist unit having a fault detection circuit and crowbar circuit in which the crowbar circuit has a transformer with a primary winding and a plurality...
5229909 Surge suppression and fault containment circuit and packaging therefor  
There is provided a circuit that protects the electronic tripping circuitry of a circuit breaker system from external transient high voltages and prolonged high voltage faults. The circuit...
5225958 Electronic endoscope apparatus capable of protecting overvoltage for solid-state image sensor  
In an electronic endoscope apparatus, an overvoltage is produced by discharging electrostatic energy induced on an electronic scope made of a synthetic resin. The electronic scope used for the...
5159520 Semiconductor integrated circuit having function of preventing rise of surface temperature  
A semiconductor integrated circuit includes a semiconductor chip having a predetermined circuit device and a PN junction diode group formed on the surface thereof. The PN junction diode group is...
5146384 Automatically resetting protection arrangement for a telephone subscriber line interface circuit  
A protection arrangement for coupling a two-wire line to a SLIC includes surge protecting triacs between each wire and ground, and normally closed contacts coupling the wires to the SLIC. The...
5144517 Intrinsically safe barrier device  
An protection barrier provides voltage and current necessarily conveyed to hazardous, such as explosive, areas. The system includes a current sensing circuit which triggers a silicon control...
5089925 Protection device for electronic circuit  
A synchronized ballast for a discharge lamp having an increased dimming range. The ballast includes a combined overvoltage and reverse voltage protection device for an electronic circuit operable...
4926281 Fail-safe and fault-tolerant alternating current output circuit  
A protected digital output circuit coupled to a programmable controller, for controlling a load supplied through alternating-current (ac) power lines, including a fuse and a single controlled...
4858054 Protective circuits and devices for the prevention of fires  
Protective circuits for preventing fires due to arc short circuits (as opposed to dead short circuits), are described. Current flow in excess of that existing during normal transient overloads is...
4745513 Protection of GTO converters by emitter switching  
A fault current protection arrangement for a power converter circuit utilizes gate turn-off thyristors as electronic switching devices. A gate turn-off thyristor is connected between relatively...
4698721 Power line filter for transient and continuous noise suppression  
A power line filter suppresses or dissipates and clamps short rise time high voltage transients carried by power transmission lines and provides continuous protection against continuous type...
4685021 Fault current diverter  
A fault current diverter for use with high voltage electrical equipment is operative to divert fault current to ground by establishing a non-arcing low impedance current path to ground. The...
4651253 Shunting element  
A shunting element includes first and second electrical terminals for shunting an electrical component, a semiconductor component, and at least two electrically conducting parts partly formed in...
4636910 Varistor overvoltage protection system with temperature systems  
A system having a bus protected against overvoltage by a plurality of series connected zinc oxide varistors in a column, uses temperature sensors to protect the varistors from damage. First...
4587588 Power line transient surge suppressor  
A power line transient surge suppressor circuit features a nonlinear surge-bypassing network connected to bypass line surges around electrical loads connected to circuit output terminals. A fuse is...
4566052 Overvoltage protection circuit for power supply  
Circuitry for use in a power supply of the type which includes a power switching means and uses a waveform of predetermined shape to control the power switching means such as in a first mode the...
4562509 Safety switch  
A safety switch for a glass door, which is used for refrigerating and deep freeze chambers and comprises two or more glass panes of hardened glass, of which the front pane (21) remote from the...
4547827 Power surge isolator  
A self-contained fused unit for the protection of electrical appliances against damage caused by abnormal power surges is disclosed. Fuses are selected so that the proper amperage required to...
4520419 Polarity and overload protective circuit for electric consumers  
The protective circuit against overpoling and overloading of an electronic consumer includes a combination of a zener diode connected parallel to the consumer and a parallel connection of a fuse...
4520416 Shunt-foldback voltage source  
A foldback power supply (12) is used in an automatic testing device for application of power to a device under test (17). Connection to the device under test is made by means of relay contacts (32,...
4477857 Printed circuit fuse  
Apparatus for preventing a fire in electrical equipment when a relatively constant overvoltage condition appears on an input line comprises a meltable fuse in the line and a surge arrestor...
4439801 Electrical load imbalance detection and protection apparatus  
The apparatus includes three electrodes housed in a single enclosure which is filled with a gas. A first one of the electrodes is connected to the junction of a load and a fuse. A second one of the...
4438477 Combination power and communication line protection apparatus  
A combination power and communication line protection apparatus includes a housing which contains a power line plug adapted to be received by a conventional wall power receptacle and a receptacle...
4389695 Equipment for protecting electronic equipment and personnel against inadvertent occurrence of extended or transient high voltages and method  
A method and equipment for protecting sensitive equipment against extended duration or transient over-voltages and their hazards. This is accomplished through a high-voltage fusing concept, a...
4371910 Safety device for electric consumers in motor vehicles  
Safety apparatus for a motor vehicle electric consumer having a temperature-dependent internal resistance, which includes a temperature indicating circuit for providing a signal which accurately...
4363064 Overcurrent protection system  
An overcurrent protection system adaptable for use with power controllers the single or multi-phase ac, or dc types includes a load current sensing element in combination with an overcurrent...
Matches 1 - 50 out of 102 1 2 3 >