461 results about "Electronic current" patented technology

The present invention provides a protection circuit disposed in a lithium-ion cell for protection of the lithium-ion cell. The protection circuit includes a first protection module, a second protection module, an integrated circuit module, a thermal sensor or thermocouple, a switch, a fuse and/or a resistor.

The invention discloses an electronic current transformer calibrating device. Two current sources respectively transmit current signals A1 and A2, wherein, the A1 is bigger than the A2 and has different frequency from the A2. A reference transformer senses the A1 and the A2 which is amplified by N folds simultaneously, and a tested transformer senses the A1. A merging unit transmits a synchronization pulse signal to the reference transformer, the tested transformer and an AD converter simultaneously, obtains digital quantities of current sampling values of the reference transformer and the tested transformer and the digital quantity of the voltage value at the two ends of a sampling resistor which is obtained by conversion with a reference AD converter at the falling edge of the synchronization pulse signal, and synthesizes the digital quantities into a data frame and sends the data frame to a control computer. The control computer compares the current signal which is obtained by sensing the A1 by the reference transformer with the current signal output by the tested transformer, calibrates the scale difference and the angular difference of the tested transformer, compares the current signal which is obtained by sensing NA2 by the reference transformer with the current signal which is obtained by converting the output voltage from the reference AD converter, and performs self calibration on the reference transformer.

This invention relates to a method of sterilizing air that contains airborne pathogenic agents or microorganisms such as spores, bacteria, viruses, yeasts and moulds The method consists in damaging and braking up the contaminant molecular structure by oxidation and ionization and chemical bond rupture. Through this process the microorganisms or the contaminants are inactivated through structural damages to the cellular membrane and/or the nucleus membrane and/or to the DNA structure. This is accomplished by creating through the air to be treated, various electronic current having a plurality of specific controlled average kinetic energies matching the desired chemical bonds to be affected and/or ruptured. The air interaction with such various currents, having specific energies, sufficient intensities and exposition time is accomplished through several stages to completely sterilize the air or gas. The air or gas is then processed to remove undesirable by-products that may be present so that it can be used directly or stored.

The invention relates to an automatic measurement range switching device of an electronic current transformer, which comprises a current sensor, a single-pole two-throw electronic changeover switch, an A/D converter and a microprocessor. The two outputs with different transformation ratios of the current sensor are both connected with one input end of the electronic changeover switch, the output of the electronic changeover switch is converted to digital quantity through the A/D converter and then read-in by the input end of the microprocessor, and the measurement range control output end of the microprocessor is connected with the changeover control end of the electronic changeover switch. The automatic measurement range switching device provided by the invention can conduct automatic switchover according to the signal variation amplitude; and in case of low current, the A/D converter adopts large measurement input to increase signal-to-noise ratio, and in case of heavy current, the switch is switched to protecting signal input to ensure large A/D input range. Through the use of the automatic measurement range switching device, the electronic current transformer can use the same A/D channel to realize high precision and large-range measurement at the same time, so as to enhance the antijamming capability of small signals.

The present invention relates to an electrochromic film. The invention demonstrates the electrochromic effect of a single substrate film by applying electronic current to induce a reversible oxidation-reduction reaction of an organic electrochromic layer. The electrochromic film can attach to a surface of an object with the using of an adhesive layer.

The invention provides an on-site steady-state accuracy verification system for an electronic current transformer and a verification method thereof. The method comprises the following steps: a, the electronic current transformer is connected with a standard current transformer in series, and primary testing current is applied to the standard current transformer and a to-be-tested electronic current transformer through a current riser; b, a secondary current signal of the standard current transformer becomes digital quantity after analog-to-digital conversion, and then the digital quantity is transmitted to an analysis processing unit of the on-site steady-state accuracy verification system for the electronic current transformer; c, the digital quantity output by the electronic current transformer is connected with the mainframe of the on-site steady-state accuracy verification system for the electronic current transformer through an Ethernet cable after photoelectric conversion; and d, the analysis processing unit performs analysis processing to the digital quantity of the standard voltage signal collected by the on-site steady-state accuracy verification system for the electronic current transformer and the digital quantity output by the electronic current transformer to obtain the verification value of the to-be-tested article. The method can realize the on-site steady state verification of the electronic current transformer and has the advantages of high verification accuracy, high speed and high efficiency.

The invention relates to a multifunctional mutual inductor checking instrument, belonging to the electronic power unit technical field. The checking instrument comprises a signal conditioning box and an upper machine, wherein, the signal conditioning box comprises two precision voltage mutual inductors, two precision current mutual inductors, a signal acquisition unit, a control unit, a power supply module, a prior voltage mutual inductor connector, a standard voltage mutual inductor connector, a prior current mutual inductor connector, a standard current mutual inductor connector, an electronic voltage mutual inductor analog quantity connector, an electronic current mutual inductor analog quantity connector and two electronic voltage or current mutual inductor digital quantity connectors. The multifunctional mutual inductor checking machine can check the prior mutual inductor, the electronic mutual inductor with an analog quantity output and the electronic mutual inductor with a digital quantity output and can satisfy the checking requirements of the prior mutual inductor.

The electronic current transformer belongs to the current transformer of the power system. It is suitable for the current measurement of the high-voltage power system of various voltage levels. It solves the problems of the current electronic current transformer with complex structure, difficult to accurately measure the transient fault current, and poor long-term stability. The high-voltage side sensing unit and the low-voltage side signal processing unit of the present invention are connected by a signal optical fiber, and the sensing unit includes a Rogowski coil, a sampling resistor, a low-pass filter circuit, an amplification circuit, a voltage-frequency conversion circuit, and an electro-optic conversion circuit; the signal processing unit consists of It is composed of photoelectric conversion circuit, pulse counter and microprocessor. The invention has both analog-to-digital conversion function and ideal integrator function. The sensing unit does not need analog or digital integration circuits, and does not need to sample synchronous signals, which greatly simplifies the structure and hardware circuit of the transformer, and improves the reliability of the current transformer.

Provided are an all-fiber electronic current transformer frequency characteristic testing device and a testing method. The testing device comprises a control calculation and display unit, a frequency response control unit and an equal ampere-turn current raising device. The control calculation and display unit is used for generating reference data and control instructions to drive the frequency response control unit and receive test data from the frequency response control unit. The frequency control unit is used for variable alternating current signals with variable frequency and size variable currents; under the control of a synchronous clock, the frequency control unit collects digitalized output signals of a data interface of a current transformer, and the collected output signals of the tested current transformer are formatted and then are transmitted to the control calculation and display unit. The equal ampere-turn current raising device is used for further raising the variable alternating current signals through an equal ampere-turn method, and the variable alternating current signals are applied to the tested current transformer. According to the testing device, large-range frequency regulation can be carried out conveniently, signals are accurate and stable, and the requirements of the fiber current transformer which has the characteristics of being wide in frequency band and large in dynamic range and the requirement of quantity transmission are met.

The invention relates to a Rogowski coil-based integrator circuit for an electronic current transformer. The integrator circuit consists of a Rogowski coil, a low-frequency gain planarization analog integrator and a signal processing circuit, wherein the Rogowski coil is used for outputting a transient signal to the low-frequency gain planarization analog integrator and outputting a steady-state signal to the signal processing circuit; the low-frequency gain planarization analog integrator is used for processing the transient signal output by the Rogowski coil and is connected with the Rogowski coil and the signal processing circuit; and the signal processing circuit is used for processing an output signal of the low-frequency gain planarization analog integrator and performing digital integration on the steady-state signal output by the Rogowski coil, and then the processed signal is transmitted to a protecting channel and a metering channel through an output interface circuit. The integrator circuit has the advantages of measuring the steady-state signal with high precision, quickly responding to the transient signal, and providing measurement data of the protecting channel and the metering channel at the same time through one Rogowski coil, along with high temperature stability and vibration resistance.

The invention discloses a management system, a platform, a module and a method of electronic current account and relevant service. The management system comprises an electronic current account service system which runs independently, wherein the electronic current account service system mainly comprises a central data processing center and an area data processing center. The invention realizes the reception, the certification, the storage and the forwarding of current account and relevant service records, also constructs a public current service management platform and a professional internal current service management system, reconstructs and upgrades relevant modules in a traditional financial system, a traditional ERP system, a traditional public integrated service management platform, a traditional commercial platform, a traditional factoring system and a traditional guarantee system, realizes the electronization of the current account and the relevant service by a corresponding system operation rule, a corresponding system operation procedure and a corresponding system operation protocol, enhances the management efficiency of a participant of the relevant service, lowers the cost, reduces the loss, enhances the benefit, simplifies the interface relationship and enhances the running stability of the system.

The invention provides an absolute time delay detection device of an intelligent substation mutual inductor data collection system. The absolute time delay detection device comprises a three-phase programmable power supply, an electronic transformer, a merging unit, a Hall sensor and a control workstation. The invention further provides an absolute time delay detection method of the intelligent substation mutual inductor data collection system. The three-phase power supply with the output voltage waveform modulated is adopted, and voltage output with coded information is achieved, and the Hall sensor is used for recording a corresponding waveform coding time sequence. Meanwhile, the control workstation detects and records corresponding output signals of the detected electronic current transformer and the merging unit, and the corresponding output signals are compared with the waveform coding time sequence recorded by the Hall sensor so as to obtain the absolute time delay of the mutual inductor data collection system. According to the absolute time delay detection device and method of the intelligent substation mutual inductor data collection system, accuracy of measurement can be ensured, meanwhile, accurate judgment and detection can be performed on the full period time delay with the detection method, and in addition, the phase difference of the current and the voltage can be detected under the condition of the same source.

The equipment for preparing solid film Li-ion battery by in-situ deposition process comprises four chambers for depositing film, and a glove box. Different kind of films are prepared in different chamber: DC magnetron sputtering chamber is used to prepare electronic current collector film; DC or RF magnetron sputtering chamber is used to prepare each cathode film; RF magnetron sputtering chamber is used to prepare each electrolyte film; vacuum heat evaporation chamber is used to prepare each metal anode film.

The invention discloses an electronic current transformer based on a Rogowski coil. The electronic current transformer comprises a Rogowski coil equivalent circuit, an amplifying circuit and an integrating circuit. The integrating circuit is connected to the Rogowski coil equivalent circuit through the amplifying circuit. The Rogowski coil equivalent circuit in an established Rogowski coil electronic current transformer model is used for allowing coil parameters to be equivalent, and a voltage signal is outputted through a sampling resistor. The amplifying circuit amplifies a small voltage signal outputted from the coil to be used by subsequent integral components. A final integration circuit is the most important part, firstly, a good integration step can amplify a signal to be restored,the accuracy of measurement can be ensured, and errors are reduced. On the other hand, the signal can be optimized, and useless interference is filtered. The simulation is carried out according to theestablished Rogowski coil electronic current transformer model and the characteristics are analyzed, and technical support is provided for the electronic current transformer in the practical process.

The invention provides a power electronic current converter and a control method capable of eliminating two-way fault current. The current converter comprises current conversion bridge arms connected through electric reactors. The current conversion bridge arms comprise T-shaped power submodules connected in series. The two horizontal ends of one T-shaped power submodule are connected through a capacitor and then connected with the vertical end of another T-shaped power submodule. The current conversion bridge arms are sequentially connected through the vertical ends, the electric reactors and the horizontal ends. Submodule controllers and optical fiber current mutual inductors of the current conversion bridge arms are connected with current conversion bridge arm controllers through optical fibers. The current conversion bridge arm controllers are connected with a current converter master controller. According to the control method, dual fault current protection is carried out on the power electronic current converter through a current detection method for a driving circuit and the current conversion bridge arms of a fully-controlled device. Compared with the prior art, the power electronic current converter and the control method capable of eliminating the two-way fault current can rapidly and effectively eliminate the two-way fault current.

The invention discloses an enhancement mode planar insulated gate bipolar transistor (IGBT), belonging to the technical field of semiconductor power devices, wherein a hole bypass structure consisting of a P+ body region and a trench-type metallization emitter is introduced based on the traditional enhancement mode planar IGBT; and on the basis of the traditional non-through type planar IGBT, a JFET(Junction Field Effect Transistor) effect weakening structure consisting of an N type hole potential barrier layer and an N- draft region is introduced, and a path structure of expanded current formed by the N type hole potential barrier layer is introduced. Through the N type hole potential barrier layer, the conductivity modulation effect of one side of a device near the emitter can be enlarged, the JFET effect is reduced, the area flown through by electronic current is increased, therefore the on-state voltage drop is lowered; through the trench-type hole bypass structure, the current density of a latch can be increased, hole extraction is accelerated, and then the shutoff speed is enhanced; in addition, the area of an exhaustion region is increased by the P+ body region, thus the breakdown voltage is also increased; and the resistance of the device can be further lowered by the trench-type metallization emitter, thus the on-state voltage drop is reduced.

The invention discloses an electronic current transformer transient transformation delay time measuring device and method. The device comprises a signal conditioning module, an optical signal transceiver, an analog-to-digital conversion module, a high-precision constant-temperature crystal oscillator module, a field programmable gate array, a microprocessor and a display module, wherein the signal input end of the signal conditioning module is used for inputting a standard source signal, the signal output end of the signal conditioning module is connected with the first signal input end of the field programmable gate array through the analog-to-digital conversion module, the second signal input end of the field programmable gate array is connected with the transmitting end of the optical signal transceiver, the receiving end of the optical fiber transceiver is used for being connected with a to-be-measured source signal, the signal transmitting end of the field programmable gate array is connected with the microprocessor, the microprocessor is connected with the display module, and the high-precision constant-temperature crystal oscillator module is respectively connected with the analog-to-digital conversion module, the field programmable gate array and the microprocessor.

The invention relates to an on-load detection method and an on-load detection device for an intelligent optical fiber electric energy meter in a substation. The method comprises the following steps of: measuring actual field running voltage and actual field running current by using an electronic voltage transformer and an electronic current transformer; outputting a digital signal, and transmitting to a combination unit; processing and allocating the digital signal by using the combination unit, and transmitting to a first optical switch; dividing the output of the first optical switch into two paths, and respectively transmitting to a detected intelligent optical fiber electric energy meter and an intelligent electric energy meter dual-central-processing-unit (CPU) calibration device; dividing the output of the detected intelligent optical fiber electric energy meter in operation into two paths, and respectively connecting to the combination unit and the intelligent electric energy meter dual-CPU calibration device by using a second optical switch; comparing standard electric energy with detected electric energy; and calculating a metering error of the detected intelligent optical fiber electric energy meter to complete the detection of the detected intelligent optical fiber electric energy meter in operation. The invention has the advantages that: the method and the device are convenient, simple, high-efficient, safe and the like.

A non-contact magnetic current sensing system (100) for measuring a plurality of power generation sources includes one or more fused electrical inputs (104, 105) that are arranged in parallel manner to form a comb feeding a center conductor member for receiving power from the power generation sources. A return connection block (113) is separated from the plurality of input fuses for providing a return path for the power generation sources. An electronic current sensing module (300) is used for providing current sensing for each of the plurality of input fuses (104, 105) in a non-contact manner. The invention provides that the electronic current sensing module is positioned over the comb for electrically connecting the electric current module to each of the plurality of input fuses and is powered solely from the power generation sources without the use of power from electrical mains.

The invention discloses a periodic non-sinusoidal wave reference of an electronic current transformer with a current booster, comprising a main iron core of the current booster, an auxiliary iron core of the current booster, a reference main iron core, a reference auxiliary iron core, a fundamental wave power supply supplying coil, a harmonic wave power supplying coil, a primary coil, a secondary coil, a detection coil of the current booster, a compensation coil of the current booster, a reference detection coil, a reference compensation coil, a compensation mechanism, a pure resistive built-in precise resistor, an operational amplifier and a secondary coil shielding layer. By adopting the invention, the primary test current of the periodic non-sinusoidal wave for verifying the accuracy of the electronic current transformer can be generated, and the secondary standard reference voltage in linear proportional relation with the primary test current of the periodic non-sinusoidal wave can be output, the limitations of verification accuracy for the fundamental wave and the harmonic wave of the traditional electronic current transformer under the condition of the single frequency is overcome, and the non-linear phenomenon of the electronic current transformer is verified.

An intelligent safety monitoring device for a charging pile, characterized in that: the charging pile monitoring device includes a DSP processor, an electronic voltage transformer A, an electronic current transformer A, a temperature sensor A, a temperature sensor B, and an electronic voltage transformer B , electronic current transformer B, power module, humidity sensor, electromagnetic switch, RFID electronic tag, GPRS module, front-end circuit, charging terminal circuit, background management server, APP client; the present invention can not only monitor the charging status of the charging pile in real time, Moreover, it has the function of remote communication and independent power failure alarm, which ensures the safe charging of charging piles, and at the same time supervises and guarantees the inspection work of inspection personnel.