Matches 1 - 50 out of 73 1 2 >
Match Document Document Title
7315097 Power saving control method and device in electronic device, and power saving electronic device  
A power saving control method includes providing a latch circuit that is supplied with current for operation from a power source even if a switch circuit is turned off, so that the switch circuit...
7064946 Electronic fuse  
An electronic fuse comprising an integrated circuit having a control output terminal coupled to a control electrode of a power semiconductor switching device, the power semiconductor switching...
6845000 Limiting circuit for a brushless DC motor  
A limiting circuit for a brushless dc motor in accordance with the present invention comprises a first transistor, a second transistor, a first resistor and a second resistor. The first transistor,...
6768622 Method and apparatus for providing thermal shutdown and current limiting protection  
The present invention provides an apparatus and method for preventing damage to a system due to runaway current and provides for the reactivation of the system. The shutdown and reactivation method...
6411483 Hiccup-mode current protection circuit for switching regulator  
A hiccup mode current protection circuit for switched mode power converters for high power applications is provided. The circuit features a comparator for comparing an indicating voltage to a...
6404608 Overcurrent protection device  
An overcurrent protection arrangement comprises a switching circuit that is intended to be series connected in a line of the circuit to be protected and which will allow normal circuit currents to...
6141198 Solid state overload relay  
A self-powered multiple phase circuit protection device including a plurality of current transformers connected in parallel with each other and associated with one phase of a multiple phase load...
6075368 Method of improving fault current measurement accuracy on electronic reclosure control  
A method of improving fault current measurement accuracy on a power line is disclosed. A first sample is obtained from a first input channel. A current magnitude is calculated from the first...
6002561 Arcing fault detection module  
An arcing fault detection module (4) for detecting arcing faults in an electrical current distribution circuit (8) comprises a filter circuit (9) and an autocorrelation circuit (10). The filter...
5999385 Ground fault circuit breaker  
A reverse fed single pole miniature ground fault circuit breaker includes a housing, a line termination on the lower portion of the housing, and a load termination on the upper portion of the...
5973416 Method for controlling a power supply switch and circuit arrangement for performing the control  
The power supply to a load in a power supply circuit is controlled by a power supply switch which in turn is controlled by a control circuit and by a feedback signal representing a voltage drop...
5926354 Solid state relay and circuit breaker  
A current interruption circuit for interrupting current flow from a source of DC power to a load includes: an electronically controllable primary switch device adapted to be series coupled between...
5841618 Power-line trip circuit  
A power-line trip circuit models the transient characteristic of a change in load (e.g. appearance of a fault current, or switch-on to a normal load) and compares the current actually flowing in...
5805400 Auto-reclosing dead time control apparatus and method thereof for transmission cable protection relay system  
An improved auto-reclosing dead time control apparatus and a method thereof for a transmission cable protection relay system which is capable of providing an on-line stability evaluation method...
5801913 Isolation circuitry  
Isolation circuitry for automatically disconnecting a load from a source upon detecting a short and for automatically reconnecting the load to the source after the short circuit clears. The...
5796636 Apparatus for and method of testing an electrical ground fault circuit interrupt device  
An apparatus for testing a ground fault circuit interrupt device includes a processor, an input device connected to the processor for receiving input from an operator, a storage media connected to...
5793593 Method and apparatus using a five-wire network for distribution of electrical power  
The present invention features a method and an apparatus for distributing electrical power from a power source to a distribution transformer, using at least one hot-phase conductor, a neutral...
5774319 Energy validation arrangement for a self-powered circuit interrupter  
A self-powered circuit interrupter arrangement for interrupting current in a circuit path uses a current-blocking component to ensure that an insufficient amount of accumulated power for actuating...
5754383 Faulted circuit indicatior with variable load levelling circuit  
A faulted circuit indicator includes a variable load levelling circuit which can automatically adjust itself to a peak current in order to accommodate a relatively wide range of load currents. The...
5696660 Line current protection circuit for use with a PCMCIA-architecture modem card  
A novel line-current protection circuit that is useable with a PCMCIA modem card is disclosed. The protection circuit is adapted to detect when an excessive voltage is present across the tip and...
5691871 Test circuit for electrical switching device  
A motor starter for an electrical circuit including a power source and a load, includes an electrical contactor having separable contacts for switching an electrical current flowing between the...
5684322 Sensitive protection component for a subscriber line interface circuit  
A high-speed monolithic protection semiconductor component implements two NPN transistors and two diodes. The cathodes of the diodes and the collectors of the transistors are connected to a common...
5668692 Self-powered circuit interruption arrangement  
A circuit interrupter arrangement for interrupting current in a circuit path includes a hysteresis control circuit arranged to control a power supply charge-accumulation switch and an undervoltage...
5666256 Electrical power distribution system apparatus-resident personality memory module  
An electrical apparatus (100) line actuator (102), such as a voltage regulator or circuit breaker, has resident therein a personality module, electronically reconfigurable memory device (126) which...
5650907 Circuit breaker  
An electronic circuit breaker is provided with a plurality of air coils, each of which is coupled to a main circuit and an overcurrent signal integrating circuit which receives the output of the...
5631795 Line fault monitoring apparatus  
The present invention relates to a line fault monitor for detecting a short circuit in a terminal-side loop line and disconnecting the short-circuit portion from a power supply, so that the...
5605224 Accessory compartment for high ampere-rated circuit breaker  
This invention relates to a high ampere-rated circuit breaker which meets the electrical code requirements of the world market. The circuit breaker electronic trip unit is contained within a recess...
5579197 Backup power system and method  
A backup power system has power supply lines extending from input terminals, connectable to a main AC power system, and output terminals, connectable to a load, with a relay connected in a power...
5570255 Overcurrent preventing circuit  
An overcurrent detecting circuit provided within a battery pack detects any overcurrent flowing in a circuit electrically connecting the battery and connection terminals. Upon detection of any...
5546266 Circuit interrupter with cause for trip indication  
In a circuit interrupter which has multiple electronic trip circuits, such as ground fault and arcing fault trip circuits, indicators such as LED's produce an indication of the cause of the trip....
5512883 Method and device for monitoring the operation of a motor  
In a method and device for monitoring the operation of a motor, the current drawn by the motor is sensed a preselected time after a peak of current is sensed. This sensed current is then compared...
5510949 Duty cycle filtered trip signalling  
A contactor circuit couples electrical power to a load, and has a current sensor responsive to a level of current for generating an output signal level when the current exceeds a fault threshold. A...
5508875 Self powered remote trip indicator  
A self powered trip indicator remotely reads out parameters such as the type of trip detected in a contactor or motor starter circuit controllably coupling a power line to a load. The contactor...
5490086 Plug-in ground fault monitor for a circuit breaker  
The present invention provides a plug-in ground fault monitor module for a circuit breaker trip unit configured to operate with a plurality of different plug-in plug-in modules. The ground fault...
5475371 Faulted circuit detector having isolated indicator  
A faulted circuit detector having an electrically isolated and remotely positioned indicator detects fault currents in a monitored conductor. When a fault of a predetermined magnitude is detected,...
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...
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...
5365394 Electronic relay to protect motors and thyristors against symmetric overload, phase unbalance and short-circuit  
A protective electronic relay is disclosed of the type which includes a feed source with a one-phase transformer, rectifying bridge, filter condenser and voltage regulator. Pickups are provided...
5319515 Circuit protection arrangement  
A number of arrangements for protecting an electrical circuit from an electrical overcurrent are disclosed. In the arrangements the base or gate of a switching transistor (4, 101, 161, 222, 401) is...
5245498 Downed conductor automatic detecting device  
A device for detecting and isolating a downed conductor in a three-phase four-wire multi-grounded distribution system cooperates with a power supply protective device if the device has a breaking...
5241444 Adaptive trip fault current indicator  
The disclosed fault indicator which senses current in a cable, resets in response to a minimum current and arms a trip arrangement in response to current rising a predetermined amount with respect...
5029039 Current adaptive fault indicator  
A fault indicator which senses current in a cable, resets in response to a minimum current and arms a trip arrangement in response to current rising a predetermined amount with respect to time. If...
5019936 Voltage-to-frequency squared circuit  
A voltage-to-frequency converter is provided for generating a frequency which is proportional to the square of the input voltage provided to the converter. Since the input voltage is correlative to...
4984124 Faulted current indicator with inrush restraint  
The disclosed faulted current indicator senses current in a line having a breaker or fuse, and avoids tripping in response to current inrush signals by producing a trip signal in response to an...
4955069 A.C. power controller with short circuit and overload protection  
An A.C. solid state power controller for controlling the current through a load from an alternating current source, including a diode bridge rectifier with its direct current output connected to a...
4879626 Overload relay with adjustable threshold indicator  
The present invention relates to an electronic overload relay which uses a schmidt trigger circuit or a CMOS integrated circuit, wherein the electronic overload relay includes an automatic return...
4853820 Electronic circuit breaker systems  
Electronic circuit breakers safeguard a load connected to a power supply against damage from overload conditions. These circuit breakers interrupt flow of overload currents to the load by...
4758919 Sectionalizer for spur lines  
Fault currents in the phases of a three-phase supply are detected by transformers 28 in respective phase links 14 and are counted by associated circuits 24 when any one of the circuits 24 reaches a...
4751606 Circuit interrupter apparatus with a battery backup and reset circuit  
A circuit interrupter includes a circuit arrangement for sampling a conditioned current value and determining operating characteristics related to the current flow through an electrical circuit....
4707759 Universal fault circuit interrupter  
Improved shock and electrical-fire protection circuits provide line-to-ground plus "line-to-line" fault protection in a power system, and monitor conditions after protective interruption to safely...
Matches 1 - 50 out of 73 1 2 >