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3914656 |
Automatic grounding system
A system for grounding alarm boxes on a series loop if a break occurs in the loop has a diode bridge and a Zener diode at each box. If a break occurs the central station power supply supplies a...
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3904931 |
Overvoltage protection circuit
A silicon controlled rectifier (SCR) is connected at its cathode to one terminal of the device to be protected and at its anode to the other terminal of the device. When an overvoltage occurs, a...
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3896480 |
Semiconductor device with housing of varistor material
A PN junction semiconductor device degradable by the application of excess voltages and voltage transients is provided integral built-in protection against such degradation by constituting what is...
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3882529 |
Punch-through semiconductor diodes
A punch-through semiconductor device having three regions of alternate conductivity types which exhibit punch-through conduction characteristics similar to the breakdown characteristics of a Zener...
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3879640 |
Protective diode network for MOS devices
A protective diode network for a differential amplifier comprised of insulated gate field effect transistors. The network provides for both gate-to-gate and gate-to-source protection using a small...
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3849665 |
SHORT CIRCUIT PROTECTED MASTER-SLAVE POWER SUPPLY
A master-slave power supply has a threshold detector on the slave supply to detect loading of the slave supply sufficient to lower its voltage below a threshold level, following which the master...
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3806773 |
FIELD EFFECT TRANSISTOR HAVING BACK-TO-BACK DIODES CONNECTED TO THE GATE ELECTRODE AND HAVING A PROTECTIVE LAYER BETWEEN THE SOURCE AND THE DIODES TO PREVENT THYRISTOR ACTION
An insulated gate field effect transistor having protective means for the gate insulator layer. The protection means comprises two back-to-back diodes connected to the gate electrode. The source...
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3798470 |
SELECTIVE D.C. ISOLATION CIRCUIT
A selective d.c. isolation circuit comprising two series diacs, a resistor, and a triac which exhibits a high impedance to voltages less than a selected threshold value and a low impedance to...
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3795821 |
PROTECTIVE DEVICE FOR A LUMINOUS DIODE
A luminous diode protecting device, which comprising a circuit containing a luminous diode and a means being connected with said luminous diode and being capable to keep the voltage supplied to...
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3790856 |
OVERVOLTAGE PROTECTION CIRCUIT FOR DUAL OUTPUTS OF OPPOSITE POLARITY
An overvoltage protection circuit for two output circuits having output voltages of opposite polarity relative to ground includes a crowbar overvoltage protection circuit for each of the outputs,...
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3784877 |
RF POWER TRANSISTOR SECONDARY BREAKDOWN PROTECTION CIRCUIT
A protection circuit for RF power transistors to prevent secondary breakdown includes gate means to monitor both the collector current and collector voltage. A gate pulse generated each time the...
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3781633 |
VEHICLE-CARRIED STORAGE BATTERY CHARGING DEVICE
A vehicle carried storage battery charging device has been provided which supplies D.C. electrical power through a rectifier circuit from an A.C. generator. A voltage regulator including a voltage...
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3769573 |
SERIES REGULATOR HAVING REGULATION FOR VARIATIONS IN LINE VOLTAGE AND LOAD DEMAND
A voltage regulator for use with a series regulator having a relatively constant output voltage with a range of input voltages and including a capacitor coupled across the input to the series...
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3754171 |
AN INSULATED GATE TYPE FIELD EFFECT SEMICONDUCTOR DEVICE HAVING A BREAKDOWN PREVENTING ELEMENT
An MOS field effect transistor comprising an N-type semiconductor substrate having a P type diffused region formed therein which is more shallow than a P type source and a P type drain diffused...
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3753078 |
FOLDBACK CURRENT CONTROL CIRCUIT
In a foldback current control circuit, a sensing resistor is connected in series between a source and an output transistor. The sensing resistor biases the emitter of a first transistor of a...
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3737672 |
LOW-LEVEL LOGIC PROTECTION INTERFACE
A low-level logic protection interface deriving operating potential from alternating-current line voltage is provided for coupling low-voltage, direct-current, detector signals of the order of zero...
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3733519 |
PROTECTION CIRCUIT FOR REGULATED POWER SUPPLIES
A protection circuit for regulated switching power supplies of the type employing a feedback circuit for adjusting the switching duty cycle to regulate the output thereof. A diode clamping circuit...
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3697850 |
BATTERY CHARGER CONNECTED IN SERIES WITH AN ALTERNATING CURRENT LOAD CIRCUIT VIA A RECTIFIER
A battery charger which receives energy for replenishing and maintaining a charge on a battery, from an alternating current source which may vary in voltage and frequency. The battery charger...
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3684896 |
FLASHER CIRCUIT WITH SHORT PROTECTION
A flasher circuit has a power transistor controlling a circuit with a load therein; a multivibrator produces a timed pulse signal applied to the power transistor for turning the power transistor...
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3673427 |
INPUT CIRCUIT STRUCTURE FOR MOS INTEGRATED CIRCUITS
An MOS integrated circuit has input circuit bonding pads individually used as gate in a protective transistor, having channel width larger than the linear dimensions of a pad, and having turn-on...
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3668465 |
SURGE VOLTAGE PROTECTION FOR CATHODE RAY TUBE DRIVERS
Disclosed in a transient voltage protective network for protecting the transistor of a video amplifier coupled to one of the input terminals of a CRT electron gun from the arcing voltages appearing...
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3668515 |
LOAD CONTROL SYSTEM EMPLOYING SILICON CONTROLLED RECTIFIERS WITH OVERVOLTAGE PROTECTION AND COMPENSATION FOR LINE VOLTAGE FLUCTUATIONS
A control system for a load includes a pair of oppositely poled silicon controlled rectifiers disposed in parallel between a line and the load, each being provided with a drive circuit energized...
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3668545 |
APPARATUS FOR AMPLIFIER PROTECTION
Protection for amplifiers and the like is provided by proportionally combining a measure of the voltage across the output terminals with a measure of the output current and actuating switching...
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3665218 |
CONTROL CIRCUIT FOR INSULATED GATE FIELD EFFECT TRANSISTORS
The gate voltage of an insulated gate switching transistor is controlled by means of a pair of reverse biased Schottky barrier diodes connected in mutual series aiding electrical relationship. A...
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3657574 |
TRANSISTOR CIRCUIT OPERATED IN SECOND BREAKDOWN MODE DRIVING A CAPACITIVE IMPEDANCE
A method of and means for driving a capacitive impedance is disclosed in which a transistor is connected between a source of electrical energy and the capacitive impedance and biased to be...
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3633093 |
AMPLIFIER OVERLOAD PROTECTION CIRCUIT
An amplifier connected in the voltage follower mode which includes a current-limiting circuit in the feedback loop. The circuit increases in impedance as an overload condition develops and a...
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3624541 |
OSCILLATOR CIRCUIT
A field-effect transistor connected in a class C Hartley oscillator circuit has a diode connected to the gate to provide bias. A similar diode is connected in series with the source to provide...
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3624502 |
CORONA-ARCING DETECTING TEST SYSTEM USING ZENER DIODES
A corona detection and measurement apparatus is provided which detects AC, DC corona discharge or combinations of both, which balances out stray capacitance current, and which employs a sensitive...
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3622806 |
DYNAMIC GATE BIAS FOR CONTROLLED RECTIFIERS
A pickup circuit connected to the main power circuit of a controlled rectifier generates an output signal responsive to the forward rate-of-change-of-voltage across the main terminals of the...
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3611042 |
RADIANT ENERGY ANALYZER FEEDBACK SYSTEM
A radiant energy analyzer is disclosed in which a feedback loop is included to vary an electrical bias to a radiant energy detector in response to selected conditions associated with an electrical...
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3609413 |
CIRCUIT FOR THE PROTECTION OF MONOLITHIC SILICON-CONTROLLED RECTIFIERS FROM FALSE TRIGGERING
Power supply voltage transients are prevented from turning on a silicon-controlled rectifier by use of a dual-emitter current switch to short circuit a given PN junction within the...
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3603813 |
FIELD EFFECT TRANSISTOR AS A BUFFER FOR A SMALL SIGNAL CIRCUIT
A field effect transistor having its drain and gate electrodes connected across a large signal generator and its source and gate electrodes connected across the input of a small signal circuit for...
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3586956 |
BATTERY-CHARGING SYSTEMS FOR ROAD VEHICLES
A battery-charging system for a road vehicle includes a permanent magnet alternator which charges the vehicle battery to a rectifier with which is associated one or more negative gated thyristors...
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3585453 |
DEVICE FOR PROTECTING ELECTRICAL LOAD OF AUTOMOTIVE VEHICLES
A device for protecting an electrical load of an automotive vehicle comprising a Zener diode connected to the output terminal of a power source circuit of the automotive vehicle, a switching...
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3584282 |
CURRENT LIMITING SYSTEM FOR MOTOR CONTROL
A system is disclosed for limiting the current to a motor operative with the controlled power supply including controlled rectifier devices for converting an AC input to a DC output wherein a...
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3571695 |
LOW DISTORTION AC LIMITER
An alternating current limiter that does not require a harmonic output filter. A reference signal is coupled through a step-up transformer with a center-tapped secondary and is applied across a...
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3564338 |
OVERVOLTAGE AND OVERCURRENT PROTECTIVE CIRCUIT FOR A TRANSISTOR AMPLIFIER
A protective transistor connected in the input of a transistor amplifier is switched to its conductive condition when the difference between a voltage proportionate to the current flowing through...
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3562547 |
PROTECTION DIODE FOR INTEGRATED CIRCUIT
A transistorized single-ended receiver circuit and a double-ended receiver circuit are provided with a protective diode to limit current resulting from overvoltage at the input during operation or...
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3546572 |
THREE-PHASE TRANSFORMER POWER SUPPLY EMPLOYING CAPACITORS AND CLAMPING DEVICES TO SUPPRESS VOLTAGE SURGES
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3538350 |
CAPACITIVE VOLTAGE DISTRIBUTION NETWORK FOR SERIES CONNECTED TRANSISTOR SWITCHES
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3536958 |
AMPLIFIER PROTECTION CIRCUIT
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3527997 |
REGULATED POWER SUPPLY WITH FOLD-BACK OVERLOAD CURRENT CHARACTERISTIC AND OVERVOLTAGE PROTECTION
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3525879 |
VARIABLE RANGE LIMITER CIRCUIT
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3524124 |
OUTPUT VOLTAGE LIMITING CIRCUIT FOR A CONSTANT CURRENT POWER SUPPLY
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3510756 |
SWITCHING MODE VOLTAGE REGULATOR
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3496449 |
TRANSISTOR PROTECTING CIRCUIT WITH OVERVOLTAGE CONTROL AND SHORT CIRCUIT PROTECTION
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3487265 |
PROTECTION CIRCUIT HAVING EXTENDED RANGE FUSE CHARACTERISTICS
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3476979 |
ELECTRICAL PROTECTION DEVICE FOR ESTABLISHING A SHORT CIRCUIT IN RESPONSE TO THE APPEARANCE OF A LOW LEVEL OVERVOLTAGE
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3473069 |
SYSTEM FOR TRANSLATING ELECTRICAL PULSES INTO INCREMENTAL MECHANICAL MOTIONS
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3473106 |
OVERLOAD PROTECTION FOR A VOLTAGE-REGULATED POWER SUPPLY
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