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5406438 |
Apparatus for triggering chemically augmented electrical fuses
An apparatus for triggering chemical augmented electrical fuses includes a light source which emits a light signal in the form of visible or infrared light energy upon receiving a signal from a...
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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...
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5394287 |
Overcurrent protective device for power device
A TSD (8) is provided in the vicinity of an IGBT (1), and reference voltages (VR1 to VR5) are provided to the negative inputs of comparators (51 to 55) as a function of a temperature detection...
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5390069 |
Short circuit limit circuit with temperature-dependent current limit
A current limit circuit is provided, with a DMOS output transistor DM2. A second DMOS transistor DM1 is provided in parallel with DM2. A pair of matched resistors R12 and R13 are connected to a...
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5383083 |
Protective apparatus for power transistor
A protective apparatus for a power transistor which detects an abnormal temperature of a power transistor and cuts a load to the power transistor to prevent possible breakdown of the power...
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5378931 |
Low leakage fuse blown detection circuit
A fuse blown detection circuit for use in conjunction with the control transistor output circuits of a programmable controller which provides low leakage after the fuse is blown. The detection...
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5379145 |
Laser transmitter for light wave (fiber optic) communication espectially of AM modulated CATV signals having means . . . against damage
A laser transmitter utilizes a laser diode which is biased to its stimulated (laser) emission mode of operation by the application of current from a source of one or more operating voltages. The...
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5360999 |
Explosively actuated thermal opening switch
An apparatus and method are provided for controlling the switching characteristics of an explosively actuated switch. The switch comprises a conductor that is only partially severed by explosive...
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5355123 |
Overheating detection circuit for detecting overheating of a power device
An arrangement for detecting overheating of a power integrated circuit includes a power device integrated in a semiconductor substrate and an overheating detection circuit. The overheating...
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5355274 |
Fused disconnect
A fused disconnect device constructed according to the present invention comprises a housing, a line side terminal, a load side terminal, a protection fuse holder assembly removably installed in a...
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5323287 |
Protective device for electric motors
A protective device for electric motors for protecting electric motors from high operational temperatures, has an element for determining an operational temperature of an electric motor and an...
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5295034 |
Method for the overload protection of devices which cannot endure continous running on account of heat loss
A method for the overload protection of devices which cannot endure continuous running on account of heat loss, to avoid a complex, cost-intensive direct coupling of the device to be protected to a...
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5291387 |
Switching voltage regulator with protective device against thermal breakdown
A switching-type voltage regulator of this invention comprises a voltage control section for generating a stabilized voltage by controlling a voltage supply period from input side to output side,...
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5291607 |
Microprocessor having environmental sensing capability
A microprocessor having a monolithically integrated environmental sensor is provided. The microprocessor is shielded from an environmental signal by isolation which is specific to the type of...
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5285346 |
Current driven control circuit for a power device
A control circuit for protecting a power device has been provided. The control circuit has a thermal shutdown circuit for activating a first SCR when the temperature of the control circuit exceeds...
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5285345 |
Modulator switching system having at least one semiconductor switch for adaptation to different load ranges and protection thresholds
A modular switching system includes a transistor operative in a switching mode for applying current to a load. Adaptation of the system to accommodate different values of load is attained by...
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5283708 |
Overload current protection apparatus
A device protects an electric load, such as a motor, from excessive current levels. The current flows from a source to the load through a switch and a primary winding of a current sensing...
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5274526 |
Fuse structure
A fuse structure for automatically resetting fuses is in the form of a housing for enclosing a resettable fuse circuit pack. The housing comprises a plurality of identically constructed shells. A...
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5267118 |
Method and apparatus for thermally separating devices on a power integrated circuit
Circuitry (46, or 28 and 70) for thermally separating a power integrated circuit device (12) from a plurality of other such devices (14, 16, and 18) on a common power integrated circuit chip (10)...
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5255149 |
Temperature abnormality detector for electronic apparatus
According to this invention, in a temperature abnormality detector, an electronic apparatus can be continuously operated without halt, a failure of a sensor can be reliably detected, and power...
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5249141 |
Method and apparatus for maintaining an active device below a maximum safe operating temperature
The present invention relates to the protection of a semiconductor active device from thermal breakdown without actually measuring the temperature of the semiconductor active device. Instead, the...
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5237481 |
Temperature sensing device for use in a power transistor
A semiconductor diode array monolithically integrated onto a power MOS transistor or power IGBT for temperature sensing. With the application of a positive bias and a constant current, the diode...
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5231848 |
Refrigerator cold control
The present invention is a cold control for refrigerators. The cold control circuit includes temperature sensitive resistances disposed within the cold box portion of the refrigerator. The cold...
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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...
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5227944 |
Breaker for surge protector
A breaker assembly for use in conjunction with a surge or lightning arrestor of the type that includes at least one varistor. The varistor circuit is enclosed within a substantially airtight...
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5221888 |
Current limited temperature responsive circuit
A temperature responsive circuit (100) has a temperature sensitive device (1), a first current source (2) connected in series with the temperature sensitive device for generating a given current (I...
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5206777 |
Three-phase panelboard using standard rated three-pole circuit protective devices in a grounded delta system
A neutral connector of a standard three-phase, three-wire panelboard is replaced by a specific multiple termination assembly having a limited number of terminations specifically adapted for...
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5206778 |
Sense circuit for on-chip thermal shutdown
An on-chip thermal shutdown circuit senses the average junction temperature of an integrated circuit device. The on-chip circuit generates a signal when the junction temperature exceeds a preset...
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5200872 |
Internal protection circuit for electrically driven device
Protection for an encased motor driven device is enhanced by utilizing additional sensors with associated resistance heaters to actuate the thermally responsive contacts of the internal line break....
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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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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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5162669 |
Semiconductor switch including a device for measuring a depletion layer temperature of the switch
A semiconductor switch includes a device for measuring the depletion-layer temperature of a semiconductor rectifier (V) which conducts load current. This device consists of a network (N) which...
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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...
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5132868 |
Over-heating protective circuit
A protective circuit for protecting electrical equipment. The circuit has a eat sensor for sensing heat from the electrical equipment, an amplifier for amplifying the sensor voltage. The circuit...
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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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5122727 |
Electric power supply system with distribution of output
An electric power supply system with at least two mains (10, 12, 14) is indicated, whose outputs (16, 18, 20) are switched in parallel and who together supply a load (22). The output power of the...
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5119265 |
Semiconductor device protection circuit
FET protection circuit (10; 100) senses the temperature of a FET (11) and, via a control circuit (24), increases FET conduction in response to sensed FET temperature exceeding a high temperature...
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5107389 |
Circuit for limiting temperature without distortion in audio power amplifiers
A circuit for limiting temperature without distortion in audio power amplifiers, comprising a temperature sensor for sensing the temperature in an audio power amplifier, and a variable-gain...
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5101315 |
Drive control apparatus for electric actuator
In a drive control apparatus for an electric actuator to be activated under control of a changeover switch, the drive control apparatus including a power transistor arranged to supply therethrough...
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5099381 |
Enable circuit with embedded thermal turn-off
An enable circuit that integrates thermal shutdown capability. The enable circuit utilizes a temperature insensitive threshold detector network that provides a desired biasing current when the...
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5099379 |
Surge preventing circuit for electromagnetic induction cooking apparatus
A surge preventing circuit for an electromagnetic induction cooker comprising a heating plate temperature sensor, an upper plate temperature sensor, a collector voltage limiting circuit, an...
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5088000 |
Electronic thermal relay and appropriate thermal element
An electronic thermal relay is disclosed which can be associated with a multiphase electric load for generating a pre-alarm and/or an order for cutting off the power supply to the load in the case...
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5073838 |
Method and apparatus for preventing damage to a temperature-sensitive semiconductor device
A temperature-sensitive semiconductor device, such as a laser diode, is protected against damage from overheating by use of a temperature sensor which produces a signal that is digitized and...
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5072327 |
Electronic protection device for use with a fuse mount
An electronic protection device without moving parts uses an automatically-resetting overcurrent protection element, such as positive temperature coefficient device, and keeps its alarm contact...
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5070427 |
Thermal switch for battery protection
Lithium batteries are protected from a runaway condition marked by over-current and high temperature by a temperature sensor having a thermally conductive housing in thermal contact with all the...
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5057811 |
Electrothermal sensor
An electrothermal sensor is shown having an electrically conductive substrate, an electrically insulating layer disposed on the substrate, a first thermistor disposed on a central region of the...
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5057962 |
Microprocessor-based protective relay system
A microprocessor-based relay system is used in combination with relay contactors and a control circuit therefor to protect an electric motor from overload currents in addition to phase faults,...
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5045964 |
Thermal clamp for an ignition coil driver
A circuit in an ignition system having a switchable current drive circuit responsive to a first control signal, and a charging circuit responsive to the switchable current drive circuit for...
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5008771 |
Diagnostic circuit for units providing current control and protection against excessive heat dissipation for semiconductor power devices
The diagnostic circuit comprises a comparator having a first input connected to the power device and a second input connected to a reference voltage generator. A signal generator is connected to...
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5008736 |
Thermal protection method for a power device
A thermally protected power transistor comprising a first chip which includes a power transistor and a second chip which includes protection circuitry. The second chip has a plurality of metallic...
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