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5386336 |
On chip current limiter
A current limiting circuit and technique is provided for preventing excessive current supplied to a circuit and for providing self-recovery characteristics thereto. The current limiting circuit...
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5384549 |
Amplifier incorporating current-limiting protection of output transistor
An amplifier circuit having a stabilized power supply circuit as a power source is arranged to ensure that, when the output is short-circuited to a power supply line, the amplifier circuit and the...
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5332973 |
Built-in fault testing of integrated circuits
Built-in current mode quiescent current monitoring circuitry is provided for measuring a circuit's or a subcircuit's quiescent current. Anomalously high quiescent current (Iddq) generally results...
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5324989 |
Power controller module providing user selectable overload protection
A remote power controller module for use in power distribution systems having a number of current limiting channels that are capable of being paralleled to provide current pathways from a power...
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5224007 |
Current window detection circuit
A ground fault interrupt circuit with an improved current window detector. The current window detector works by first rectifying the input current in a pair of current mirrors connected in back to...
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5187632 |
Controllable semiconductor switching device having integrated current limitation and overheating disconnection
A controllable semiconductor switching device having integrated overload protection of a load current path, including a switching section in the load current path and a multiplicity of main...
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5185684 |
Frequency selective arc detection
An arc detection method and apparatus is provided for an electric circuit having an electrified conductor (46) connecting a voltage source (26) to a load (30). A field sensor senses an...
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5177659 |
Device for protection against the short circuit of an MOS-type power device, with a preset dependance on the temperature at which the power device operates
The device for protection against the short circuit of an MOS-type power device comprises at least one secondary branch cirucit arranged in parallel with a main branch circuit which includes the...
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5162965 |
Anti crow bar current interrupter for microwave tube transmitters
A high-speed high-voltage FET current interrupter which opens the cathode circuit of microwave tubes when internal tube arcing occurs. By removing the detrimental fault current which causes...
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5128823 |
Power semiconductor apparatus
A power MOS transistor and a current sensing MOS transistor have a common drain electrode connected to a load. The gates of these MOS transistors are commonly controlled in response to an input...
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5122724 |
Inrush current limiter
A circuit for limiting the inrush current in DC to DC and DC to AC power supplies. The circuit utilizes a small capacitor for taking a charge which slowly turns on a FET transistor placed in series...
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5086294 |
Indicator circuit for protecting light emitting diode
An indicator circuit for indicating the states of various electric components such as limit switches, comprising a light emitting device such as a light emitting diode, and a constant current...
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5084668 |
System for sensing and/or controlling the level of current in a transistor
A transistor sense electrode (20) is coupled to the input branch (24) of a current mirror (22). The current mirror's branch (26) carries a current substantially equal to the current in the input...
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5045963 |
Protective circuit for the induction coil of a magnetically inductive flow meter
The invention relates to a protective circuit for the induction coil of a magnetically inductive type flow meter. If the leads of a flow meter used in an explosive environment are cut there can...
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4994932 |
Superconducting current limiting apparatus
A superconducting current limiting apparatus includes a first container, a superconducting current limiting element accommodated in the first container, a refrigerant filling the first container...
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4987512 |
Solid state circuit protector
A solid state circuit protector is comprised of a coil winding, a latching type Hall effect device, and a solid state switching network including an NPN bipolar junction transistor with a current...
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4985818 |
DC voltage converter with formation of the actual current value
An autoconverter has an electronic switch activated by turn-on pulses and a circuit arrangement for the formation of the actual value of the current in a primary input circuit. Inrush currents are...
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4983955 |
Electric power supply circuit monitoring systems
Monitoring an electric power distribution circuit having a rated load capacity includes continually sensing an intensity of electric power supplied through that circuit. In response to that sensing...
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4956565 |
Output circuit with drive current limitation
A transistor output stage including an output transistor having its base coupled to the emitter of a driver transistor is driven into saturation by a current source which is connected to the base...
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4935836 |
Guard circuit for the protection of capacitive loads
The DIN Standard VDE 160/01.86 involves specific requirements as far as the dielectric strength of electronic devices is concerned which are intended for operation at high-voltage networks. A guard...
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4931778 |
Circuitry for indicating the presence of an overload or short circuit in solid state relay circuits
In a solid state relay circuit using a power semiconductor as the output circuit switching device and having protection against current overload and short circuits, an indicator circuit for...
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4924343 |
Solid state optical relay
A solid-state, four terminal optical relay has a current regulator with two input pins, and an output switch with two output pins. The relay includes an optical isolator assembly so that the...
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4890188 |
Solenoid driver system
A solenoid driver system drives a solenoid, such as a solenoid in a glue applicator or any like apparatus incorporating a solenoid, and which requires control of the solenoid in response to a...
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4871924 |
Safety power receptacle with hot wire switch-through
Safety power outlet connected to a plurality of power lines and arranged to receive the prongs of a matching multi-pronged power plug has a receive terminal connected to each power line. The...
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4868706 |
Protection circuit for a battery charger
A protection circuit for a battery charger for safely charging a battery from a remote electrical power supply is disclosed. The protection circuit includes a power control means responsive to...
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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...
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4849850 |
Circuit for protecting electronic devices against overload
A circuit for protecting electronic devices which are fed from a source of dc voltage and to which a subscriber's line (ASL) is connected. In order to limit the current in the event of an overload...
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4841281 |
Apparatus for controlling a switching amplifier
An apparatus for controlling the output of a switching amplifier includes a signal dividing circuit which generates a delayed replica of the carrier signal and a doubled signal having twice the...
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4814932 |
Device for protection against short circuits for AC networks and current limiting circuit breaker appropriate for such a device
A device for protecting an AC distribution network against short circuit currents and an appropriate current limiting circuit breaker. A downstream circuit breaker (D1) generates a signal (S) for...
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4812943 |
Current fault protection system
An overcurrent protection system (10) for a power supply is disclosed. The system monitors the instantaneous flow of current between a power supply (12) and an electrical load (16) to detect when...
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4810936 |
Failing lamp monitoring and deactivating circuit
A discharge lamp monitoring and deactivating circuit includes a normally closed switch in series with the discharge lamp and its ballast and a detector circuit connected across the lamp to monitor...
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4795980 |
Device for monitoring short circuits and overloads in electronic proximity switches
A device for monitoring short circuits and overloads in electronic proximity switches of a transmission line. The device is a testing circuit which includes a current pickup which measures the...
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4763220 |
Static switch circuit or device for the protected supply of a load, and its line
Each phase circuit comprises a static switch of the IGT or GTO type, between the anode and the cathode of which there is arranged in parallel a series mounting of a CTP resistance and of a normally...
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4736267 |
Fault detection circuit
In a solenoid fuel injection system, an output transistor (16) receives switching signals to control through current therein which is provided to a solenoid fuel injection coil (11) in series with...
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4733319 |
High-speed current limiting circuit breaker
A high-speed current limiting circuit breaker comprises a self-recovery type current limiting element for limiting a fault current, a parallel resistance connected in parallel with the...
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4723188 |
Permanent magnet surge arrestor for DC power converter
An improved surge current limiting method and apparatus is provided for an inverter circuit. The inverter includes electronic switching devices serially connected between relatively positive and...
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4710699 |
Electronic switching device
An electronic switching device having a detection circuit or input circuit powered by an external source and load is described. The external source and load are in a series circuit with a power...
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4709160 |
Solid state dc power switch
A dc power switch responsive to an input signal referenced to a signal reference terminal and having a power input terminal connected to a dc voltage source and a power output terminal connected to...
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4701675 |
Apparatus for limiting arc discharge current in incandescent lamp
An arc discharge current occurred in dc-illuminated incandescent lamp can be effectively suppressed with an apparatus comprising first resistance connected in series with an incandescent lamp...
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4686617 |
Current limited constant frequency dc converter
A constant-current, current-programmed dc-to-dc converter includes a controllable switch and an inductor. The switch is rendered conductive in response to a recurrent clock signal, and...
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4678984 |
Digital power converter input current control circuit
A digital power converter input current control circuit is connected between a power converter and a power source. This circuit monitors, and controls if necessary, the current that flows between...
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4669026 |
Power transistor thermal shutdown circuit
A thermal shutdown circuit for use with a high power transistor which incorporates a sense emitter. A differential amplifier is driven from the transistor base and the sense emitter and has an...
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4661880 |
Failsafe monitoring system with input controlled switch circuits
According to the load-driving switch circuit monitoring system of the present invention, on-off control of a switch circuit connected to in a circuit in series for driving an electric load is...
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4659942 |
Fault-tolerant power distribution system
A fault-tolerant power distribution system which includes a plurality of power sources and a plurality of nodes responsive thereto for supplying power to one or more loads associated with each...
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4654770 |
Current-limit circuit in X-ray generator
Current limit protection is provided to ensure that the current flow within the transistor inverter does not exceed a predetermined safe level to thereby cause damage to the various components such...
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4638396 |
Intrinsically safe battery circuit
An overload protection circuit is disclosed which limits the current supplied by a battery to a load. The circuit is particularly adapted for use in portable radio applications which must meet...
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4638138 |
High frequency inverter circuit for melting and induction heating
A two-pole inverter bridge has an inductor mounted between the two controlled switches in each pole and a resonant load is connected across the poles between ends of the inductors which are...
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4634936 |
Intrinsically safe miner's lamp
An intrinsically safe battery pack arrangement for electrically powering electrical devices is disclosed. The power pack has a device for electronically determining a short in a cable or device and...
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4626953 |
Doubly overload-protected power distribution system
A power distribution system consists of an inverter means providing power to a plurality of separate outputs, with each separate output being protected by its own individual overload protection...
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4594630 |
Emission controlled current limiter for use in electric power transmission and distribution
Method and apparatus are provided for an emission controlled current limiting device. The apparatus may control the current thermionically, by cold cathode emission, by photo-emission, or with...
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