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| Number | Title | Issue Date |
| 7339485 | Rectifier for supplying double voltage and RFID tag thereof Disclosed is a rectifier for supplying double voltage and an RFID tag thereof. The rectifier includes a charging part for charging an input voltage induced to input ends by a received radio frequency (RF) signal; a power provider for charging a sum voltage correspon... | 03/04/2008 |
| 7315255 | Load status indicator A load status indicator is disclosed wherein a green light-emitting diode of a bi-color light-emitting diode lights up when power is available to but not being used by a monitored device, whereas a red light-emitting diode of the bi-color light-emitting diode lights... | 01/01/2008 |
| 7262700 | Inductive powering surface for powering portable devices An inductive powering device provides power to a portable device via inductive coupling between primary coils in the surface of the powering device and a secondary coil in the portable device. The portable device includes a passive locator device, such as an RFID de... | 08/28/2007 |
| 7123006 | Sensing apparatus having fluxgate and control method thereof In a sensing apparatus, and a control method of a sensing apparatus, the sensing apparatus includes a fluxgate including a driving coil for exciting a magnetic substance core with a current, first and second current amplifiers for applying the current to first and s... | 10/17/2006 |
| 6998735 | Controlled rectifier bridge, control system, and method for controlling rectifier bridge by disabling gate control signals A controlled rectifier bridge includes a plurality of segments each having an element responsive to a control signal, and an output having a voltage, a first current and a second current. Sensors provide sensed current values from first and second output currents fr... | 02/14/2006 |
| 6822432 | Methods and systems for automated pipeline testing A system and method for testing a cathodic protection system includes a cathodic protection rectifier configured to apply a voltage across a pipeline and a reference point. The method includes measuring a magnitude of an output voltage of the cathodic protection rec... | 11/23/2004 |
| 6320404 | Defective power source detection method and apparatus of power source supply system The defective power source detecting apparatus of a power source supply system has: an output voltage monitoring circuit 16-1 to 16-N for monitoring the DC voltage on an output end of the rectifier circuit which is an output end of each power source appar... | 11/20/2001 |
| 6147616 | Automatic power interruption and re-supply relay for an electric power line The present invention provides a digital automatic power interruption and re-supply relay for performing detection and comparing operation to inform a state of an accident with voice and numerals and automatically operating a connected relay to interrupt ... | 11/14/2000 |
| 5785842 | Corrosion protection monitoring and adjustment system A system for monitoring and alternatively adjusting the electrical energy input and output of remotely located corrosion protection rectifiers on a section of a longer pipeline includes three elements. The first element is a monitoring unit which monitors... | 07/28/1998 |
| 5578936 | Method and apparatus for automatically testing semiconductor diodes A portable electronic test instrument is adapted for the automatic testing of semiconductor diodes regardless of the orientation of the diode relative to the test probes. The test instrument supplies an a.c. sine wave test voltage coupled to the test prob... | 11/26/1996 |
| 5510725 | Method and apparatus for testing a power bridge for an electric vehicle propulsion system A method for testing a power bridge for an electric vehicle propulsion system, the power bridge including a switching circuit having first and second switching elements operable between "on" and "off" states. The method comprises the steps of selectively ... | 04/23/1996 |
| 5225815 | Monitor for a polyphase rectifier which detects open diodes by sensing a signal below a predetermined threshold An electronic circuit senses that at least one circuit of rectifying diodes has been opened and response initiates an alarm. To sense one of the diode circuits being opened, the electronic circuit detects a temporary crossing of a low threshold by a DC vo... | 07/06/1993 |
| 5223821 | Triac power switching and testing system In a triac power switching system, two triacs are connected in series between an AC power source and a load. Each time power is applied to a load, the triacs are tested by first turning on one of the triacs while maintaining the other triac turned off, th... | 06/29/1993 |
| 5119073 | AC ripple meter An apparatus and method are disclosed for measuring and displaying the percentage of ac voltage ripple present on a direct current input voltage. In addition, the apparatus can be set to activate alarms and trip relays when the percentage of ac voltage ri... | 06/02/1992 |
| 4929932 | Solid state relay having visual contact monitor A visual indication system for easily providing information about the status of the output terminals of a solid state relay. A two-electrode neon glow lamp is connected across the output terminals of the relay in series with a current limiting resistor. T... | 05/29/1990 |
| 4847728 | Detecting a defective suppressor diode in a coil driving circuit A driver circuit for the coil in relay contains a suppressor diode across the coil terminals. Two light-emitting diodes are connected in reverse polarity so that one diode operates when the coil is energized and the other diode operates if there is curren... | 07/11/1989 |
| 4713652 | Electrical apparatus An electrical apparatus for monitoring electrical continuity includes a number of input circuits each associated with a respective arm of a multi-phase rectifier circuit the continuity of which is to be monitored. Each input circuit includes a comparator ... | 12/15/1987 |
| 4685045 | Device for failure detection in series-connected semiconductor rectifiers A device for failure detection in series-connected semiconductor rectifiers (1) comprises transformers (2) whose number is equal to that of the rectifiers (1) and which comprise input windings (3), supply windings (6), and additional parallel-connected wi... | 08/04/1987 |
| 4672315 | Circuit arrangement for monitoring a thyristor A circuit arrangement for monitoring a thyristor comprising an auxiliary thyristor disposed between the anode terminal and gate terminal the thyristor, and a signal generator device which contains a light-emitting diode for sending light signals to an eva... | 06/09/1987 |
| 4644258 | Electronic switch An electronic switch with CSE wiring, especially a triac, has a load connected in series therewith to an a-c voltage network. A rectifier bridge circuit has its a-c terminals connected into the driving circuit of the electronic switch. The d-c terminals o... | 02/17/1987 |
| 4633241 | Method of automated in-place SCR testing An automated SCR cell test exercises each of the twelve SCRs in a dual, 3 phase, full wave SCR rectifier bridge singly to detect shorted SCRs and in pairs to detect open SCRs or faulty gate circuits.... | 12/30/1986 |
| 4600917 | Gate-turn-off thyristor failure detecting circuit A gate-turn-off thyristor failure detecting circuit includes a detector which detects an off-gate signal for a gate-turn-off thyristor and a current level detector which compares the signal with a predetermined value and produces an output signal indicati... | 07/15/1986 |
| 4597038 | Switching overlap protection by control gate impedance monitoring In a power converter switching system, the instantaneous blocking ability of semiconductor switching elements is determined by monitoring the reverse blocking ability of a control junction in each switching device. A gate firing circuit applies negative t... | 06/24/1986 |
| 4577072 | Telephone equipment tester A tester for telephones and telephone answering systems features a dialing test capability for high speed dialing systems by providing the dialed digits in a single display element serially in time at a delayed rate set by strobing the digits from a memor... | 03/18/1986 |
| 4565998 | Diode failure detecting device in rotary rectifier A diode failure detecting device in a rotary rectifier having fuses provided respectively for phases and connected in series to rectifying diodes. Light emitting diode circuits in one embodiment are connected in parallel respectively to the fuses which ar... | 01/21/1986 |
| 4559486 | Detector for shorted rotating diode of a brushless alternator A circuit for detecting the occurrence of a shorted diode in the rotating rectifier of a brushless alternator. A sensing circuit is responsive to the direction of current flow through the exciter field winding. A reversal of the current indicates that the... | 12/17/1985 |
| 4554507 | Arrangement for testing the operability of a semiconductive device An arrangement for checking the integrity and operability of a semiconductive device including a control circuit for injecting test signals into a normal control signal to induce a momentary change of the operating condition of the semiconductive device, ... | 11/19/1985 |
| 4494182 | Commutation detection apparatus and method A method and apparatus for use in conjunction with a power conversion system employing a plurality of switching elements for controlling the electrical power supplied to a load from a source includes the sensing of the instantaneous voltage furnished to t... | 01/15/1985 |
| 4471301 | Device for monitoring thyristors of high-voltage valve A device for monitoring thyristors of a high-voltage valve comprises thyristor voltage detectors coupled via light guides to a buffer storage unit through a selector. Also provided are an OR gate assembly, an adder, a memory unit, and a comparison unit, w... | 09/11/1984 |
| 4442480 | Protective circuit for thyristor controlled systems and thyristor converter embodying such protective circuit A snubber circuit coupled across each thyristor to be gated in a chain of thyristors determines the critical output of a NOR LATCH whenever one snubber circuit could not be charged and discharged under normal gating conditions because of a short failure.... | 04/10/1984 |
| 4415884 | Diagnostic circuit for programmable logic safety control systems A programmable controller (41) based logic system places two electronic output converters (14,18) in series for redundant protection against the inadvertent energization, due to the failure of an image register (66,68) or due to the shorted failure of a t... | 11/15/1983 |
| 4394647 | Voltage monitoring arrangement for ORed power diodes Each power diode in an ORed direct-current power distribution system has connected thereacross, between the respective load and source terminals of the power diode, a series connection of respective first and second light-emitting diodes (LEDs) with the L... | 07/19/1983 |
| 4374380 | Automotive electrical network voltage regulation monitoring circuit To provide a visible output indication, for example by an indicator light on a controller supervisory panel of the vehicle, of proper functioning of the voltage regulator power transistor, monitoring circuits are provided which sense the electrical condit... | 02/15/1983 |
| 4349813 | Blown fuse sensor Each arm forming a three-phase full wave rectifier bridge includes a semiconductor diode, a current transformer and a fuse. The current transformer is connected to a pulse extinction indicator circuit through a pulse transformer. When no current flows thr... | 09/14/1982 |
| 4346347 | Diode faults detecting apparatus First and second diodes are formed on the same semiconductor substrate. Both the diodes are forward biased by a direct current power supply. An attenuator is connected to a positive terminal of the first diode to produce an output lower in level than a vo... | 08/24/1982 |
| 4285023 | Rectifier system with failure alarm circuitry A rectifier unit for supplying power to a D.C. load including a transformer having a primary, a secondary and a saturable core, the secondary defining an output section and a control section. A ferroresonance control circuit simulates saturation of the tr... | 08/18/1981 |
| 4259636 | Monitoring device for semiconductor rectifiers A monitoring device for semiconductor rectifiers which are located in a three-phase current bridge circuit, in which the bridge circuit is provided with two semiconductor rectifiers per rectifier branch, including a current-sensitive detector circuit conn... | 03/31/1981 |
| 4242674 | Alternator failure warning indicator A transistorized detector sensitive to the ripple component of the DC output of an alternator gives a visual or audible warning signal when the ripple component exceeds a predetermined level providing early indication of failure of either a winding or rec... | 12/30/1980 |
| 4242713 | Triac output asymmetry detector A circuit for protecting an AC driven load that is controlled by a solid state device, such as a triac, or inverse SCR's, or the like. Whenever the AC power output of the control is asymmetrical to the load, the circuit produces a signal capable of shutti... | 12/30/1980 |
| 4228477 | Circuit for monitoring the current distribution in parallel-connected converted branches A circuit arrangement for monitoring the current inbalance in two parallel-connected converter branches, each of which includes at least two series-connected converter valves. The anodes and cathodes, respectively, of adjacent converter valves in a given ... | 10/14/1980 |
