How to Current voltage?

Overvoltage protection circuit used in power factor corrector and power factor corrector,Monitoring device for flexible heating elements,Plasma measuring method, plasma measuring device and storage medium,Fuel cell system,Interpolation method suitable for aero-engine real-time model

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Current is the rate at which electric charge flows past a point in a circuit. In other words, current is the rate of flow of electric charge. Voltage, also called electromotive force, is the potential difference in charge between two points in an electrical field.

Overvoltage protection circuit used in power factor corrector and power factor corrector

InactiveCN101557162AImprove transient responseEffective protectionEfficient power electronics conversionEmergency protective circuit arrangementsOvervoltageReference current

The invention provides an overvoltage protection circuit used in a power factor corrector and the power factor corrector, wherein the overvoltage protection circuit comprises a current-voltage switching circuit, a reference current-reference voltage switching circuit, a static overvoltage comparing circuit, a dynamic overvoltage comparing circuit and an overvoltage synthesizing circuit; the current-voltage switching circuit is used for switching a current signal output by an error computing amplifier to a first voltage signal and outputting the first voltage signal to the static overvoltage comparing circuit and the dynamic overvoltage comparing circuit; the reference current-reference voltage switching circuit is used for switching the reference current signal of a current source to a second voltage signal and outputting the second voltage signal to the dynamic overvoltage comparing circuit; the static overvoltage comparing circuit is used for comparing the voltage value of the first voltage signal with the voltage value of the reference voltage of the static overvoltage comparing circuit and outputting a static overvoltage signal; the dynamic overvoltage comparing circuit is used for comparing the voltage value of the first voltage signal and the voltage value of the second voltage signal and outputting a dynamic overvoltage signal; the overvoltage synthesizing circuit is used for synthesizing the static overvoltage signal and the dynamic overvoltage signal, controlling the shut-off of a power element and realizing quick shut-off of the power element.

Owner:XIAN MINZHAN COMM TECH CO LTD

Monitoring device for flexible heating elements

InactiveUS20050263519A1Avoid overall overheatingHeating element shapesFiberElectrical conductor

The invention concerns a controlling and monitoring device for avoiding damage through overheating in the case of flexible, textile surface heating elements which include at least two opposed contact conductors (3.1, 3.2) made of electrically conducting, non-insulated fibers or wires between which there extends a plurality of heating conductors (8) which are electrically connected to the contact conductors (3.1, 3.2) and to a current-voltage source. At least one additional conductor (1) is guided along at least one contact conductor over the heating conductors (8), wherein the additional conductor (1) is electrically insulated by a covering material and is connected to an electric or electronic evaluation switch (11). The coating material has a softening range which is above the standard heating temperature of the surface heating element, but below the permissible thermal limit temperature of the surrounding materials and of the base material (12), wherein, in the case of overheating, the coating material melts and wherein the heating conductors (8.1, 8.2), together with the additional conductor, form an electrical contact via which, for the purpose of controlling any overheating, an electric current flows to the electric or electronic evaluation unit which is connected to the current-voltage source.

Monitoring device for flexible heating elements

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Owner:I G BAUERHIN GMBH

Plasma measuring method, plasma measuring device and storage medium

InactiveUS20100321029A1Easy to optimizeHighly effectiveElectric discharge tubesMaterial analysis by electric/magnetic meansElectricityCurrent voltage

Provided is a technique capable of ascertaining the process condition of the boundary between electrically positive and negative plasma regions. In a vacuum chamber, one of the parameters of process conditions is stepwisely changed to generate a plasma under at least three process conditions. The parameters include a flow rate ratio between an electrically negative gas and an electrically positive gas, a pressure in the vacuum chamber and the magnitude of an energy supplied to the gases. Next, a voltage is applied to a Langmuir probe positioned in that plasma, and a current-voltage curve indicating the relationship between the applied voltage and the electric current to flow through the probe is acquired for each of the process conditions. On the basis of the current-voltage curve group acquired, the process conditions are determined for the boundary between the electrically positive and negative plasma regions.

Plasma measuring method, plasma measuring device and storage medium

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Owner:TOKYO ELECTRON LTD

Fuel cell system

ActiveUS8092947B1Find exactlyFuel cell auxillariesSolid electrolyte fuel cellsFuel cellsCurrent voltage

Provided is a fuel cell system that performs a warm-up operation by reducing a supply of oxidant gas to a fuel cell, the system having: a fuel cell; and a control unit that regulates amounts of oxidant gas and fuel gas supplied to the fuel cell and controls a power-generation state of the fuel cell. During the warm-up operation with a reduced supply of oxidant gas to the fuel cell, the control unit varies a voltage of the fuel cell for a short period of time to obtain current-voltage characteristics which indicate a relationship of an output voltage and an output current of the fuel cell, calculates an effective catalyst area of the fuel cell based on the obtained current-voltage characteristics, and determines whether the warm-up operation of the fuel cell can be stopped or not based on the calculated effective catalyst area.

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Owner:TOYOTA JIDOSHA KK

Interpolation method suitable for aero-engine real-time model

ActiveCN110489877AReduce computing timeSustainable transportationSpecial data processing applicationsAviationCurrent voltage

The invention belongs to the technical field of aero-engine design, and particularly relates to an interpolation method suitable for an aero-engine real-time model. The method comprises the followingsteps: firstly, recording an interpolation algorithm of a current rotating speed position, a current pressure ratio position and a current adjustable blade angle position and the slope; performing first interpolation according to the current rotating speed; obtaining four discrete points, carrying out second interpolation according to the current adjustable blade angle; obtaining two discrete points, and finally, carrying out third interpolation according to the current voltage ratio to obtain the flow and the efficiency of the current working point; recording the interpolation position and the slope of the previous period in the difference calculation process of the next working point, judging whether the position value and the slope value need to be updated or not. Repeated circulation caused by searching is reduced, the interpolation efficiency in a real-time model is improved, and the real-time model running speed is increased.

Interpolation method suitable for aero-engine real-time model

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Owner:AECC SHENYANG ENGINE RES INST

Single-phase AC voltage detection protection circuit based on mutual inductor

ActiveCN113740595ALow costImprove reliabilityElectrical apparatusEnergy saving control techniquesMicrocontrollerOvervoltage

The invention discloses a single-phase AC voltage detection protection circuit based on a mutual inductor. The protection circuit comprises a microcontroller, a reference voltage circuit, a current limiting circuit, a current-voltage conversion circuit, a filter circuit, a voltage amplification circuit and a waveform conversion circuit, wherein the microcontroller collects and samples the single-phase alternating-current voltage which is subjected to current limiting through the current limiting circuit, conversion through the current-voltage conversion circuit, filtering through the filter circuit and amplification through the voltage amplification circuit to obtain sampling data of the single-phase alternating-current voltage, calculates real-time single-phase alternating-current voltage, compares the real-time single-phase alternating-current voltage with a preset overvoltage value and a preset undervoltage value, and when the voltage value is higher than the overvoltage value or lower than the undervoltage value, controls the external relay driving circuit to turn off the power supply; the waveform conversion circuit converts square wave output, the microcontroller collects square waves to detect real-time frequency and a zero crossing point, and when the zero crossing point is detected, the external relay drive circuit is controlled to turn off a power supply. The protection circuit is advantaged in that an effective value of the single-phase AC voltage is detected in a real-time, high-precision and wide-range manner, and the protection circuit is controlled based on the effective value.

Owner:SICHUAN LISHIDA INTELLIGENT LIGHTING TECH CO LTD

Preparation method of composite metal ion water

PendingCN113023836AControl concentrationPrecisely control the quantityMultistage water/sewage treatmentWater/sewage treatment by substance additionChemical physicsElectrolysis

The invention discloses a preparation method of composite metal ion water. The method comprises the following steps: step 1, putting two electrolysis polar plates into each water tank; 2, injecting deionized water into each water tank; 3, carrying out electrolytic treatment; and 4, mixing the deionized water containing the metal ions to obtain the composite metal ionized water. Two electrolysis polar plates are placed in each water tank, direct-current voltage is applied to the two electrolysis polar plates, the positive electrode and the negative electrode of the direct-current voltage are switched, the switching time is controlled, and metal ions on the two electrolysis polar plates are electrolyzed into deionized water; the number of ions, entering the deionized water, of the two electrolysis polar plates is accurately controlled, so that the concentration of the metal ions in the obtained composite metal ionized water is controlled, the composite metal ionized water is obtained by mixing the deionized water containing the metal ions in all the water tanks, and the obtained composite metal ionized water can be applied to various environments.