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7372218 |
Open protection circuit for backlight module
An open protection circuit ( 300 ) for a backlight module includes a PWM ( 350 ) with a control port ( 351 ) to disable the PWM. A switch ( 371 ) has a gate and a source connected to the control...
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7342761 |
Apparatus and method for limiting application of electrical power to a load
The application of electric power from a power source to a load is controlled by detecting the magnitude of electric current flowing to the load and producing a first signal level that is...
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7339773 |
Method for driving a semiconductor switch and circuit configuration with a semiconductor switch
A method for driving a semiconductor switch with load current limiting and thermal protection whose maximum load current is limited and which switches off when a predetermined upper temperature is...
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7333313 |
Multiplexed temperature sensing circuit for HID lamp ballast
A temperature sensing circuit for a ballast for a HID lamp multiplexes the temperature measurement function with another function to reduce the number of pins required for the temperature...
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7327543 |
Method and device for switching a semi-conductor circuit breaker
The invention relates to a method for switching a semi-conductor circuit breaker by means of which the resistance of the breaker gap of the semi-conductor circuit breaker is controlled by a control...
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7321102 |
Float switch transient suppression device
A float switch system for limiting to desirable levels current and energy entering a tank of combustible liquid comprises: a float switch disposed within the tank; an interface circuit external to...
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7286332 |
Apparatus for protecting bicycle electrical components
An electrical control apparatus comprises a current sensor and a current inhibiting circuit that inhibits current flow between first and second terminals of a bicycle dynamo when current sensed by...
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7280335 |
Protection circuit and method for protecting a switch from a fault
A protection circuit for protecting a switch from a fault includes a first sensing circuit and a second sensing circuit. The first sensing circuit senses a low-side load current through a switch...
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7268992 |
Power supply with disconnect fuse
A power supply in which a feed voltage (U s ) is guided through at least one longitudinal branch to at least one output, the at least one branch having a disconnect fuse formed as a controlled...
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7250794 |
Voltage source converter
A voltage source converter with a line-side diode rectifier, a load-side inverter with an electronic circuit, a power supply for the electronic circuit, and a slim DC link with a DC link capacitor...
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7233462 |
Voltage regulator having overcurrent protection circuit
An overcurrent protection circuit for a voltage regulator has a first transistor having a gate for connection to a gate of an output transistor of the voltage regulator, a resistor connected to a...
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7218496 |
Overcurrent protection circuit
The voltage generator circuit includes a regulator, a first sensor circuit, and a second sensor circuit. The first sensor circuit includes a first transistor, a first resistor, and an error...
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7183835 |
Semiconductor device which realizes a short-circuit protection function without shunt resistor, and semiconductor device module
A control output signal is supplied to a gate electrode of an insulated gate transistor from a control signal output terminal of a control device, however, with regard to the insulated gate...
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7161783 |
Overcurrent protection circuit for switching power supply
In an overcurrent protection circuit for a switching power supply having multiple voltage supply sections, an overcurrent in a low voltage supply section is detected to make it possible to take a...
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7158359 |
Circuit configuration having a semiconductor switch and a protection circuit
A circuit configuration has a first semiconductor switch and a first protection circuit. The protection circuit has a second semiconductor switch whose load path is connected between a control...
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7136269 |
Inverted circuit overcurrent protection device and hybrid integrated circuit device with the same incorporated
An inverter circuit overcurrent protection device in which an overcurrent detection resistor (Rs) is incorporated in a hybrid integrated circuit, in which a detection voltage from the overcurrent...
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6956727 |
High side current monitor with extended voltage range
A high side current monitor circuit includes an op amp which is coupled across a sensing element which carries a current I sense and develops a shunt voltage V sense . A feedback transistor driven...
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6947272 |
Inrush current control method using a dual current limit power switch
A current limit circuit regulates the current flow through a power switch 90 by measuring the current through the switch 90 and comparing it to a reference voltage V REF that represents the...
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6917503 |
Programmable current limiting using a shunt resistor
An overcurrent protection circuit using a shunt resistor and the voltage drop across a switch to program a user-defined current limiting level. This protects the switch and the input power supply,...
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6891707 |
Semiconductor protection circuit
In a semiconductor protection circuit comprising a low speed protection circuit having an overcurrent detector for detecting an overcurrent of a predetermined switching element and turning off the...
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6870325 |
Led drive circuit and method
An LED drive circuit is disclosed, comprising an electronic controller which is arranged to monitor LED current as a first input. The controller also receives a second input from a sensor...
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6781502 |
Method of forming a protection circuit and structure therefor
A protection circuit ( 10 ) is formed to protected a load ( 11 ) when a short circuit develops during operation of the load ( 11 ). A load transistor ( 18 ) is formed to couple the load to a...
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6717787 |
Current sensing IC with resistive sensing
A power MOSFET has a main current carrying section and a sense current carrying section, with separate source electrodes. The source electrode of the main section is connected to the device source...
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6704183 |
Fault detection in a LED bias circuit
A bias circuit for preventing excessive emission from light emitting diodes includes a switch connected to power. A light emitting diode connects to the switch output. Two bias current legs,...
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6697242 |
Main element of a surge protector device
The present invention is directed to a main element of a surge protector device and its fabrication method which uses breakdown phenomenon of a single high resistive film. A breakdown voltage and a...
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6639776 |
Programmable controller
A programmable controller has an overcurrent detection portion, an overcurrent indication portion and a transistor for interrupting a load current at the time of occurrence of an overcurrent are...
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6633473 |
Overcurrent control circuit of power semiconductor device
The present invention relates to a technique of limiting an overcurrent of a power semiconductor element ( 1 ) such as an IGBT. In a background art overcurrent protection circuit ( 10 P), when an...
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6594131 |
Over current protection circuit of semiconductor switching device
In an over current protection circuit of a semiconductor switching device, a change in a main current of a semiconductor switching device with respect to a change in the detected voltage of the...
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6587027 |
Solid state fuse
A solid state fuse type protective circuit is provided in which a series MOSFET is connected in series with the load and its voltage source and a shunt MOSFET is connected in parallel with the...
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6580590 |
Motor driver fault protector
A motor driver high current protector includes a voltage source, a current sensor, a comparator, a switch, a delay circuit, and an inhibitor. The current sensor is configured to sense current...
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6404607 |
Power distribution module
A power distribution module is especially suited to vehicular applications. An input/output module port is adapted for connection to an external multiplexed communication path, with transceiver...
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6396674 |
System and method for monitoring the operation of a power converter
A fault detection circuit and method for monitoring a power converter system to identify faults. The detection circuit includes two comparator circuits each having one input connected to the dc bus...
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6377428 |
Switching device having the capability of detecting an abnormality
A switching device includes a commanding device ( 813 , Q 51 ) which commands a driving of a load, a driving device ( 111 ) which outputs a drive signal in response to a drive command signal from...
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6356424 |
Electrical protection systems
An electrical protection system on a power distribution side includes a control element of a series combination of a PTC device thermally coupled with a resistive device, and a relay coil coupled...
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6320733 |
Pulse-width modulator for controlling a semiconductor circuit breaker
A pulse-width modulator for controlling a semiconductor circuit-breaker in a switched-mode power supply has a comparator circuit for generating control pulses determined by an oscillator signal....
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6278596 |
Active ground fault disconnect
A circuit for detecting and automatically responding to ground faults. A passive protection PTC resistor is coupled in series with an active protection switch, the active protection switch being...
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6268988 |
Ground fault detector for gas discharge tubing
A method of detecting absence of connection of an external ground to a ground connection point associated with an AC supply circuit of a power supply. The AC supply circuit has hot and neutral...
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6246559 |
Power controller with short circuit protection
A sensing and control circuit for power line shorts works especially well for sensor or actuator devices controlled through a microcontroller. A power control circuit is placed between a pin of a...
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6236184 |
Variable speed cooling fan control
An AC to DC to AC converter has an input to receive input AC, a rectifier to rectify the input AC to DC, and an inverter to invert the DC to output AC. A load sensor senses load on the AC to DC to...
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6185082 |
Protection circuit for a boost power converter
A protection circuit for a boost power converter provides input under-voltage protection and output over-voltage and over-current protection. The protection circuit includes a control power MOSFET...
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6137666 |
High speed, selective protective relays
A protective relay receives current and voltage inputs, digitizes them and reduces the effects of high and low frequency noise. In the case of a distance relay, incorporated in the relay is a...
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6108182 |
Overcurrent sensing circuit and self adjusting blanking
A sensing circuit 100 includes two resistors 11 and 12, two pnp transistors 13 and 14, and a current mirror 15 and 16. Resistors 11 and 12 convert the high voltages present in the bridge into a...
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6094330 |
Circuit interrupter having improved current sensing apparatus
A circuit interrupter of the type including an electronic trip unit for overcurrent determination which includes a small-sized iron core current transformer to power the trip unit electronics along...
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6072679 |
Electric protection systems including PTC and relay-contact-protecting RC-diode network
An electrical protection system includes a control element of a series combination of a PTC device thermally coupled with a resistive device, and a relay coil coupled with relay contacts. If the...
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5999384 |
Circuit interrupter with arcing fault protection and PTC (positive temperature coefficient resistivity) elements for short circuit and overload protection
A circuit protection apparatus employs a PTC element for overload and/or short circuit protection and an arcing fault interruption arrangement. The circuit protection apparatus may be employed in a...
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5955792 |
Method and device for driving a load
A method and a device for driving a load, particularly an electromagnetic load. The current flowing through the load is detected, and is controlled by a control device connected in series to the...
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5914843 |
Neon power supply with improved ground fault protection circuit
A power supply power supply circuit of the kind which includes a transformer having primary and secondary windings and an oscillator for driving the primary winding in a bi-directional fashion,...
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5864456 |
Clock line over-current protector and industrial control system employing same
A clock line over-protection circuit (28) carried on an interface card (16) for interfacing synchronous clock line (20), power line (22), DC common line (24) and data line (26) between a host...
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5859757 |
Output driving circuit for use in DC stabilized power supply circuit
An output transistor supplies a current based on a drive current to a load. An output voltage is divided by a feedback voltage, and an error amplifier outputs a voltage according to a difference in...
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5844326 |
Managed electrical outlet for providing rank-ordered over-current protection
A managed electrical outlet includes a plurality of electrical receptacles, a current sensor, logic circuitry, a switch driver, and one or more switches. The electrical current provided to the...
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