57results about "Current/voltage measurement" patented technology

An organic light emitting device includes a display panel which includes a plurality of pixels, a power supply which generates a driving voltage, an overcurrent detector which detects an overcurrent flowing from the power supply to the display panel, and a driving voltage blocking unit which blocks the driving voltage to the plurality of pixels based on an output signal of the overcurrent detector.

The invention discloses an analog circuit for detecting the wire breaking of a displacement sensor LVDT, which comprises a displacement sensor LVDT, wherein a primary coil of the displacement sensor LVDT is connected with an excitation signal source. The analog circuit for detecting the wire breaking of the displacement sensor LVDT is characterized in that the output ends of the secondary coils of the displacement sensor LVDT are respectively connected with a test signal and are respectively connected with a multi-channel selection switch through a filter and rectifier circuit, and predetermined different groups and combinations of wire breaking voltages which are output when an LVDT is disconnected are simultaneously connected with the multi-channel selection switch; the two output end voltages of the secondary coils of the LVDT are respectively combined with a group of comparison voltages to be connected with each comparator, and each comparator is connected with the output control end of the multi-channel selection switch through an arithmetic logic OR unit, and the multi-channel selection switch is simultaneously connected with a servo amplifier. The invention can directly achieve the detection of wire breaking state only by a hardware circuit, and the method is simple and reliable.

A multi-scanner device having a detection unit and an outlet tester that can be selectively connected together for convenient use and easy storage. Preferably, a plug on the outlet tester is inserted into a non-functional socket located on the detection unit to form a multi-scanner device with a detachable outlet tester.

The invention discloses a neutral point direct current online measurement device for a transformer, which comprises a Hall sensor, a copper bar, a transmission fiber, a signal processing module arranged in a box body, a photoelectric power conversion module, a measurement signal photoelectric conversion module and a power laser launching circuit module, wherein the copper bar penetrates through the two sides of the box body; the copper bar in the box body is sleeved with the Hall sensor; the signal processing module is used for receiving an output signal of the Hall sensor, converting the output signal into an optical signal and outputting the optical signal into the measurement signal photoelectric conversion module; the measurement signal photoelectric conversion module is used for converting the inputted optical signal into an electrical signal to output; the photoelectric power conversion module is used for providing power for the Hal sensor and the signal processing module; and the power laser launching circuit module is used for inputting medium power laser for the photoelectric power conversion module. The neutral point direct current online measurement device adopts the optical fiber to supply the energy and transmit the signals, blocks an over-voltage transmission path and improves the measurement stability and the accuracy.

A safe power supply circuit of the invention comprises a single-chip microcomputer control circuit, a loop protecting circuit and a voltage reducing and stabilizing power supply circuit which supplies electric power to the single-chip microcomputer control circuit. The output end of the loop protecting circuit is connected with a voltage detecting circuit. One end of the output end of the voltage detecting circuit is connected with the single-chip microcomputer control circuit, and the other end is connected with a loop switch protecting circuit. The output end of the loop switch protecting circuit is connected with a current detecting circuit. The output end of the current detecting circuit is connected with the single-chip microcomputer control circuit. The output end of the single-chip microcomputer control circuit is connected with a voltage detecting circuit. The safe power supply circuit can settle the problems of no protecting measures for overvoltage, overcurrent and reverse charging; and incapability of realizing automatic matching between a charger and an anode and a cathode of a battery. Higher safety and higher user-friendly performance of an electric vehicle are realized.

A measuring apparatus (10), in particular for measuring current, is provided, having a sensor (40) and an evaluation device (42) which is coupled or can be coupled thereto, in which said coupling is effected contactlessly, in particular by means of a transponder interface (44, 46), so that on the one hand current can be measured in a reaction-free manner, wherein on the other hand the resulting measuring apparatus (10) can be used in a particularly flexible and versatile manner on account of the manoeuvrability of the components with respect to one another and on account of the relatively large possible distance between the two parts of the transponder interface (44, 46).

A battery voltage measuring system includes an analog/digital converter configured to receive a higher reference voltage and a lower reference voltage which is lower than the higher reference voltage and to outputs a digital output value based on an input voltage which is lower than the high voltage reference voltage and is higher than the low voltage reference voltage. A battery supplies a battery voltage as the higher reference voltage to the analog/digital converter; a first power supply supplies a first reference voltage as the input voltage to the analog/digital converter; and a second power supply supplies a second reference voltage as the lower reference voltage to the analog/digital converter.

A method and an apparatus for a trouble-location on a transmission line of a concurrent double line are provided. The method includes the steps of: converting a three-phase voltage and current signal on the transmission line to a small signal; collecting and storing the converted voltage and current value as data; comparing the data with predetermined reference data to determine the trouble of the transmission line as well as trouble types; separating and obtaining the voltage and current data after and before the trouble responding the comparing step; performing trouble location algorithm for the obtained data based on a predetermined starting mode to get a current distribution factor, and caculating the trouble distance and trouble information at the trouble point by utilizing the current distribution factor.

The invention relates to a reactance relay and a re-closing method, the reactance relay is based on the current of a fault point of a mixed circuit of a high-voltage cable and a trolley wire, the reactance relay based on the current of the fault point is the reactance relay based on information of momentary current on two sides of the circuit, the momentary current on two sides of the circuit is utilized, capacitance current of a trolley wire circuit and a cable circuit and the current of a shunt reactor of the trolley wire are compensated, and the precise current of the fault point can be obtained by calculation. As for the mixed circuit of the high-voltage cable and the trolley wire without the shunt reactor, a protector on the trolley wire side is used for judging whether the re-closing is started or not, the protector on the trolley wire side always adopts the synchronous check way for superposition, the action range of the reactance relay is set to the junction of the trolley wire and the cable, if the reactance relay acts, a fault occurs in the trolley wire circuit, the re-closing is started, otherwise, the re-closing is locked. The re-closing is started when the fault occurs in the trolley wire of the mixed circuit, and the re-closing is locked when the fault occurs in the cable.

A detecting device for a fuel injector includes a sensor unit and an ECU. The sensor unit is provided with a fuel pressure detection circuit which outputs a pressure detection signal in response to a fuel pressure. The ECU computes the fuel pressure based on a voltage value of the pressure detection signal relative to a reference voltage. The ECU obtains a comparative voltage according to an applied-voltage to the fuel pressure detection circuit and computes a deviation between the comparative voltage and the reference voltage. The sensor unit adjusts the applied-voltage in such a manner as to decrease the deviation. Thus, the computation accuracy of the fuel pressure is improved.

A method and an apparatus for dynamic signal switching with multiple measurement sources, for a merging unit in an electrical power system, said merging unit receiving at least two input signals from at least one current transformer measuring the same physical primary quantity. The method comprises a step of outputting from said merging unit, in a real-time mode, a digitized output stream of sampled values with the truest representation of the physical primary quantity, based on the actual values of the input signals.

An auxiliary tool for a resistive current testing wire of a 750KV lightning arrester comprises a tong-shaped wire clamp, an insulated rod, a wire clamp bracket, an operating rod, and an extended rod which is obtained through modifying a common insulated rod. The wire clamp bracket is fixedly arranged at the upper part of the insulated rod and furthermore obliquely extends along the upper part of the insulated rod outwards. The operating rod is provided with an operating wrench, a test switch, a test wire pile and a grounding pile. The operating wrench is obliquely arranged at the middle part of the operating rod. The middle part of the operating wrench is provided with a fixing screw hole. The test switch is closely adjacent with the operating wrench. The test wire pile and the grounding pile are arranged at the end of the operating rod and are respectively used for connecting with the testing wire and the grounding wire of a resistive current tester. The tail end of the extended rod is provided with a connecting pipe for connecting with the operating rod and another extended rod. The auxiliary tool has an advantage of simple operation and can satisfy a requirement for resistive current testing wires of lightning arresters with different heights, so that a tester is protected from an induction voltage in a wiring process, thereby improving safety and accuracy in resistive current testing of the 750KV lightning arrester.

The invention discloses a multichannel battery sampling circuit and a sampling method thereof. The multichannel battery sampling circuit includes a battery pack, a channel switch unit, a battery voltage difference processing unit, a channel switch control unit, a micro-processing unit and a switch control circuit, wherein the battery pack is connected with an input end of the channel switch unit; an output end of the channel switch unit is connected with the battery voltage difference processing unit; an output end of the battery voltage difference processing unit is connected with the micro-processing unit; and an output end of the micro-processing unit is connected with the channel switch unit through the channel switch control unit. By adopting the structure, the invention has the advantages that, firstly, as the battery voltage sampling channels can be switched according to the logic control signals issued by the mirco-processing unit, the sampling method can improve the battery voltage detection precision and avoid the big power consumption during system hibernation; secondly, the system performance is improved; and thirdly, the system structure is optimized, and the reliability, the flexibility and the performance price ratio of the system are improved.

The invention discloses a safe torque turn-off circuit and system. The safe torque turn-off circuit comprises a power source module, an input module, an execution module and an STO diagnosis module. Double channel redundancy design is adopted in each of the input module and the execution module. Double channel design is adopted in an output passageway, dynamic detection of an output module is realized in a zero vector state, fault accumulation can be prevented, and diagnosis coverage rates can be improved. The double channel redundancy design is also adopted in an input passageway, dynamic monitoring of the input module can be realized via transmission of two channels of test narrow pulses with certain phase difference between the same, and the diagnosis coverage rates can be improved.

A method for controlling amplified signals in a medical diagnostic device having an amplifier system that is adapted to amplify input signals having a baseline and filter means for filtering the amplified signals, comprising the detection of the presence of an amplified signal having an amplitude that is above an upper voltage threshold or below a lower voltage threshold, and freezing the baseline of the amplified signal upon the detection thereof.

The invention relates to a residential power load identification method based on template matched filtering, and belongs to the intelligent power utilization and efficacy monitoring fields. The method is characterized in that a characteristic current template of each electric appliance is calculated; the frequency spectrum of the total current when multiple electric appliances work together is calculated; a threshold is selected to assign 0 and 1 to the frequency spectrum component of the characteristic current template to determine a template filter; the template filter is used to filter the frequency spectrum of the total current; and whether the electric appliance is in the working state is determined according to the reservation degree between the filtered frequency spectrum and the frequency spectrum component of the characteristic current template. Under the condition of non-invasion power utilization data collection, the using state of residential power load is effectively determined, problems in power load identification can be solved, the load type which is being operated can be distinguished from mixed data when multiple loads operate simultaneously, the operation conditions of the single loads are separated, and the method serves as an effective realization method of non-invasion load monitoring technology.

The invention discloses a method, device and equipment for predicting overlarge differential pressure of a battery pack, and the method comprises the steps of determining a single battery cell with apotential problem in the battery pack; acquiring voltage sampling data of a battery pack of a single battery cell with a potential problem; when the voltage sampling data is located in the same temperature interval and the same battery remaining capacity interval, calculating the maximum slope under two adjacent groups of voltage sampling data of the battery pack; judging whether the maximum slopeexceeds a preset slope threshold value or not, and when the maximum slope exceeds the preset threshold value, judging that the voltage difference of the battery pack is too large. The method achievesthe prediction of the overlarge differential pressure of the battery pack, can take corresponding measures in advance when the overlarge differential pressure of the battery pack is predicted, and prevents the overlarge differential pressure of the battery pack from affecting the energy of the battery pack.

The invention provides a method for detecting voltage drop of a three-phase power network based on a mean-value filter, comprising the steps of utilizing the mean-value filter to carry out mean-value filtering on d-axis component of the voltage and obtaining the mean value of the d-axis voltage; and judging the drop situation of the voltage in the power network according to the mean value of the d-axis voltage. According to the method, the metering quantity is small and the reliability is high, and a negative-sequence current component can be inhibited when the voltage of power network is unbalanced. The invention provides the method for quickly detecting the voltage drop, can be used for detecting the drop situation of the voltage within the 1/4 commercial electricity period, and is easy to be applied in practical situation, and the metering quantity is small and the reliability is high,.

The invention discloses a novel alternative current high voltage acquisition circuit which comprises a high voltage resistor, a micro-transformer of current, an air gap protection device and a resampling circuit, wherein the high voltage resistor is connected in series with a primary coil of the micro-transformer of current, the air gas protection device is connected between two ends of the primary coil of the micro-transformer of current, and the resampling circuit is connected between the two ends of a secondary coil of the micro-transformer of current. The novel alternative current high voltage acquisition circuit firstly converts primary high voltage into weak current signals, and then samples the weak current signals and converts the signals into secondary low voltage signals in such a manner that the structure of a secondary circuit is simpler. In addition, primary voltage is isolated from secondary voltage. Furthermore, current signals are transmitted between the primary voltage and the secondary voltage, and high resistance to interference is achieved.

The apparatus is for use with a grid-linked facility and an alarm functionality. The grid-linked facility is of the type having a building containing an electrical load; and a breaker connected to the load and to the grid. The alarm functionality includes electronics adapted to produce information, the information being responsive to the availability of grid power downstream of the breaker; and transmission functionality adapted to receive information and to send received information beyond the building, the transmission functionality being coupled in use to the electronics for the receipt of information therefrom. The apparatus comprises a sensing functionality disposed in use upstream of the breaker; and circuitry coupled in use to the sensing functionality and the transmission functionality to deliver information associated with the availability of grid power upstream of the breaker to the transmission functionality.

A method for testing a multicore cable including not less than three insulated wires to identify a correspondence relationship between one end portion and an other end portion of the insulated wires exposed from both ends of the multicore cable. The method includes inputting a test signal, by capacitive coupling, to an end portion of the tested insulated wire among end portions of the insulated wires exposed at one end of the multicore cable, inputting a phase-inverted test signal in an opposite phase to that of the test signal, by capacitive coupling, to an end portion of the insulated wire, other than the end portion of the tested insulated wire, and measuring voltages of output signals output respectively from end portions of the insulated wires exposed at the other end of the multicore cable to identify an other end portion of the tested insulated wire based on the measured voltages.