44 results about "Galvanostat" patented technology

The invention discloses a light-emitting diode (LED) driving power supply and an LED lighting lamp. The LED lighting lamp comprises an LED light source chip, a substrate, the LED driving power supply and a lamp casing. The LED light source chip is arranged on the substrate to form an LED lamp panel fixedly arranged in the lamp casing. The LED driving power supply comprises a bridge rectifier circuit, a power factor corrector circuit and a galvanostat circuit which are sequentially electrically connected. The input end of the bridge rectifier circuit is used for being connected with an external power supply, and the output end of the galvanostat circuit is connected with the LED light source chip. The rated forward voltage of the LED light source chip is no higher than the direct-current voltage output by the power factor corrector circuit. In the LED lighting lamp, high-voltage direct-current voltage is subjected to constant current and then directly drives the LED light source chip. The LED driving power supply is simple in structure, small in loss, high in efficiency and strong in generality, and therefore general utilization of the LED lighting lamp can be achieved.

The invention relates to a self-feedback linear galvanostat integrating an adjustable thermistor, which belomngs to the technical field of a semiconductor power device. The self-feedback linear galvanostat comprises a junction-type field effect transistor (JFET) and an adjustable thermistor, which are integrated together, wherein one end of the adjustable thermistor is connected with a JFET source electrode, and the other end is connected with a grid electrode of the JFET. The self-feedback linear galvanostat is centralized on the adjustable thermistor, and the adjustable thermistor can obtain a resistance value meeting the requirement of the output current through a laser cutting way, so that different types of products can be obtained in the same batch. The thermistor is a positive temperature coefficient, under the working situation, the temperature is increased, the resistance is increased, the output current is reduced, and the reliability of an application system is protected. The self-feedback linear galvanostat has advantages of high integration, stability in output current, adjustability of the current and good temperature property and can be applied to the fields such as light emitting diode (LED).

Disclosed is a method of in-situ monitoring a reduction process of uranium oxides by lithium metal, wherein a conversion yield of uranium metal from uranium oxides upon production of uranium metal through a reaction of uranium oxides (UO_x, x≦3) with lithium metal in the presence of a high-temperature molten salt is measured according to an electrochemical analysis based on an oxidation of an oxygen ion and a reduction of a lithium ion dissociated from lithium oxide obtained as a by-product of the reaction, by use of a measuring device composed of a potentiostat/galvanostat and a reactor provided with an anode and a cathode. The in-situ monitoring method of the current invention is advantageous in terms of fast and simplified measuring techniques, by directly measuring the reduction process of uranium oxides at the anode and cathode connected to the potentiostat/galvanostat in the presence of the high-temperature molten salt.

The invention relates to a heat-dissipation structure of a light-emitting diode (LED) daylight lamp. A metal heat-dissipation inner sleeve is arranged inside a glass tube outer cover or a full-plastic tube outer cover, an LED lamp panel is fixedly connected with a lamp bead heat conductive plate and is placed on bulged strips of the metal heat-dissipation inner sleeve, and two sides of the lamp bead heat conductive plate are attached to two inner sides of the metal heat-dissipation inner sleeve. The outer wall of the metal heat-dissipation inner sleeve is attached to the inner wall of the tube outer cover, and therefore the heat-dissipation area of the lamp bead heat conductive plate is increased, the requirement for the temperature for the long service lives of LED beads is basically met, and an LED galvanostat is convenient to assemble. The heat-dissipation structure of the LED daylight lamp enables products to meet the international electrotechnical commission 60598 (IEC) standard requirement, avoids the phenomenon of electric shock, guarantees safe use of the LED daylight lamp, and enables the service life of the LED daylight lamp to be effectively guaranteed at the same time, thereby effectively promoting the development of the LED daylight lamp.

The invention provides an on-line gas density measuring method which realizes the parameter measurement by utilizing a measuring device; the measuring device comprises a galvanostat, a throttle, a differential pressure sensor and a computer, wherein the inlet end of the galvanostat is connected with measured gas, and the outlet end of the galvanostat is communicated with air through the throttle; two air pressure input interfaces of the differential pressure sensor are connected with pressure sampling pipes at two sides of a throttle hole of the throttle, and the signal output end of the differential pressure sensor is connected with the input port of the computer; during testing, the measured gas continuously flows through the galvanostat and the throttle sequentially, the pressure difference Delta between two ends of the throttle are measured at the same time, then the density of the measured gas is calculated by using the following formula: p:p=2*deltaP/(qV/C/(1-Beta4)0.5*epsilon*Pi/4*d2)2. Due to the adoption of the method, not only is the on-line measurement of the gas density realized, but also the measuring device is simple in structure, low in cost, and exact and reliable in measuring structure, and furthermore, a condition is created for the accurate measurement of flow of mixed gas and the accurate control of gas density.

One object is to provide a measuring device configured to evaluate the power generation characteristics of a response-delay type fuel cell automatically, precisely, and with excellent reproducibility with consideration of the response delay against power load fluctuations, and effectively acclimatize and develop microorganisms that are provided to generate power. A potentio-galvanostat is connected to a microbial fuel cell provided as an exemplary response-delay type fuel cell. Further, an automatic measuring device is connected to the potentio-galvanostat. The automatic measuring device has a program function and measures the internal resistance of the microbial fuel cell at set time. The internal resistance measurement is executed through the automatic measuring device that instructs the potentio-galvanostat to change a current value flowing to the microbial fuel cell and that repeatedly executes the process of measuring and recording a voltage value of the microbial fuel cell and the current value while changing a current control value in stages after the voltage value is stabilized.

The invention discloses a device and method for electrochemical hydrogen permeation measurement in a high-temperature environment and belongs to the field of electrochemical hydrogen permeation measurement technologies. The device comprises a cathode chamber, an anode chamber, an external circulating constant-temperature oil bath device, a constant current meter, an electrochemical workstation anda data collection device, wherein an electrolytic solution is contained in the cathode chamber and the anode chamber, organic alcohol with a melting point lower than 80 DEG C and a boiling point greater than 150 DEG C is used as a matrix of the electrolytic solution, phosphoric acid and phosphate are dissolved in the matrix, and the organic alcohol can dissolve the phosphoric acid and the phosphate in an 80-150 DEG C working environment. The test method comprises the steps that a sample is fixed into a double-electrolytic cell, the electrolytic solution is added into the cathode chamber and the anode chamber, and the external circulating constant-temperature oil bath device is utilized to maintain an electrochemical hydrogen permeation test in the cathode chamber and the anode chamber inthe 80-150 DEG C high-temperature environment. Through the device and method, the problem that electrochemical hydrogen permeation is unavailable under the temperature of 80 DEG C or above is solved,the temperature range of the electrochemical hydrogen permeation test is expanded, and important scientific research value is obtained.

A device and method is described for analyzing the elemental composition of a liquid sample utilizing a combination of electrochemical pre-concentration followed by spectrochemical analysis of analytein a single device. The device consists of two electrodes for the purpose of pre- concentration of the analyte ions by electro-deposition, a DC power supply/potentiostat/galvanostat, a high voltage power supply capable of creating an electrical discharge such as arc, spark, glow discharge or plasma, a spectrometer capable of recording a spectrum generated during such discharges as well as a pump(s) for pumping the analyte containing solution. Such a device is autonomous, field-deployable and capable of providing online analysis.

The invention discloses a high-precision electronic blood pressure detector, relating to a blood pressure detector. The high-precision electronic blood pressure detector comprises a power supply, a sensor, a sleeve strap, a galvanostat, a 16-bit Sigma-Delta A/D (Analog/Digital) converter, an air pump, a keyboard display and an air valve; the power supply is connected with the sensor; the sensor is connected to the 16-bit Sigma-Delta A/D converter; the sleeve strap is connected to the sensor; the air pump is connected to the galvanostat; the keyboard display 7 is connected with the 16-bit Sigma-Delta A/D converter to each other; and the air valve is connected with the 16-bit Sigma-Delta A/D converter. The high-precision electronic blood pressure detector disclosed by the invention has the advantages of high hardware integration level, simpleness and convenience for design and implementation, integration of multiple advanced algorithms, such as morphological filtering and the like in software design, high accuracy, strong anti-jamming property, favorable precision and capability of meeting general requirements of blood pressure measurement.

The invention discloses a device for simulating and evaluating damages of recharge to a stratum. The device comprises a gas cylinder, a sucking pump, a pressure stabilizer, a galvanostat, a buffer chamber, a liquid storage tank, a first liquid sucking pump, a stirring barrel, a first valve, a second liquid sucking pump, a sterilization device, a first flow meter, a first pressure meter, a second pressure meter, a second flow meter, a liquid discharging pipe, a waste liquid barrel, a salt adding device and a sample holder, and can simulate and evaluate damages of recharge to the stratum.

The invention relates to an LED constant-current driver overvoltage and overcurrent protection module. The protection module is arranged between a driver and a load. The protection module comprises an overvoltage diode D1 and resistors R1 and Rcs. The output part is protected by the use of the overvoltage diode D1. If an output voltage of a galvanostat is too high (higher than a voltage regulation value of D1), the output voltage will be limited at the voltage regulation value of D1 so as to prevent LED damage caused by overvoltage. According to the output part, the resistor Rcs is used as a current limiting resistor of an output load. If output current exceeds service power of the resistor, the resistor will protect safety of LED due to insufficient power.

The invention discloses a linear high-power-factor driving circuit. The linear high-power-factor driving circuit comprises a power supply, a rectifier and a plurality of driving circuit units, whereinthe power supply is connected with the first driving circuit unit through the rectifier; each driving circuit unit comprises an LED load, an electronic filter, an electrolytic capacitor, a galvanostat segmented circuit unit and a current detection resistor; the LED load and the electronic filter are connected in series to form a first branch to be connected with the electrolytic capacitor in parallel; the first branches of the adjacent driving circuit units are connected through an isolation sectionalizer; the output end of the first branch is connected with the input end of the galvanostat segmented circuit unit, and the output end of the galvanostat segmented circuit unit is connected with one end of the corresponding current detection resistor; and the current detection resistors in the adjacent driving circuit units are sequentially connected in series, and the current detection resistor in the last driving circuit unit is grounded. According to the linear high-power-factor driving circuit, the segmented working mode is adopted, so that the working current waveform of the load follows the voltage waveform, thereby improving the power factor.

The invention discloses a device for measuring permeability of a filter and belongs to the fields of water environment, traffic, chemistry and the like. The device comprises a galvanostat, a galvanostat connecting pipe, a pressure stabilizing tank, a pressure gauge, a valve, a sample container and a sample connecting pipe. The test process is completed on weighing equipment; before the test is started, the valve is closed, flowing water flow is introduced above the galvanostat until water flows out of an overflow port and the water flow is stable, and at the moment, the total weight of the device before the test is recorded; the valve is opened, the water flow starts to uniformly flow into the pressure stabilizing tank, and the reading of the pressure gauge and the test starting time are recorded; the test is ended when the liquid level of the pressure stabilizing tank rises to the lower edge of the glass tube, connected with the pressure stabilizing tank, of the galvanostat, and the total weight of the device and the test ending time are recorded; the air volume is calculated according to the weight difference, water and the air density under the corresponding pressure, and then the permeability index of the filter is calculated. The constant water flow device is adopted to replace a conventional air source method, so that the pressure is more constant and controllable; and the accuracy of measuring the permeability of the filter is improved.

The invention discloses a semiconductor galvanostat which belongs to the technical field of semiconductor devices. The semiconductor galvanostat comprises an MOSFET (Metal Oxide Semiconductor Field Effect Transistor) (14), a voltage stabilizing diode (13) and a current limiting resistor (12) which are integrated on the same chip. One end of the voltage stabilizing diode is connected with the grid G of the MOSFET, the other end of the voltage stabilizing diode is connected with the source S of the MOSFET, one end of the current limiting resistor is connected with the drain D of the MOSFET, and the other end of the current limiting resistor is connected with the grid G of the MOSFET. The voltage stabilizing diode can be used for clamping a voltage of the grid of the MOSFET, so that the current ID of a drain source of the MOSFET is maintained constant; and the current limiting resistor R can inhibit the current of the voltage stabilizing diode. The current limiting resistor can be a polycrystalline silicon resistor and also be a trap resistor. The semiconductor galvanostat has the characteristics of simple structure, remarkable constant current effect, and stable temperature, and can be used as an LED illumination load constant-current drive source.

The invention provides a method for balancing battery cells in a battery pack, and belongs to the technical field of electric automobiles or energy storage systems. A galvanostat is arranged on each battery cell control panel; the battery cell control board is communicated with the battery pack control board, a battery cell information acquisition device is arranged on the battery cell control board, and the battery cell information is transmitted to the battery pack control board by the battery cell control board; and the battery pack control panel transmits a balancing command to the battery cell control panel according to the battery cell information, and the battery cell control panel executes balancing of the battery cells according to the command. The battery cell equalization can be realized without leading out an equalization line from each battery cell, and the risk of short-circuit fire is avoided; and the temperature rise of the battery pack is reduced.

The invention relates to an improved mobile power source, which comprises an outer shell, wherein a control circuit board is arranged inside the outer shell; the upper part of the control circuit board is connected with a power inlet galvanostat and then connected with a power inlet socket on the outer shell, and the lower part of the control circuit board is connected with a power outlet galvanostat and then connected with a lithium iron phosphate battery pack, so as to ensure that the current and voltage are stable; the control circuit board and the lithium iron phosphate battery pack are further connected with a protection circuit board and a digital display circuit board for preventing short circuit of the circuits and displaying electric quantity; the protection circuit board is connected with a charging socket arranged on the exterior of the outer shell; and the digital display circuit is connected with an intelligent electric quantity alarm and then connected with an electric quantity display screen arranged on the exterior of the outer shell. Through the improvement, the improved mobile power source has the advantages of being long in service life, being safe and environment friendly, being convenient to master the electric quantity condition for prompting charging of the mobile power source, and preventing the occurrence of electric leakage accidents.

The invention discloses a galvanostat, a water outlet terminal, a bubbler and an adapter, the galvanostat comprises a shell and an elastic ring, a water flow cavity, a water inlet and a water outlet are formed in the shell, the water inlet and the water outlet are communicated with the water flow cavity, and the elastic ring is arranged at the end, where the water outlet is located, of the water flow cavity; the elastic ring is located on the periphery of the water outlet. The device further comprises a movable part which is movably arranged in the water flow cavity, the movable part is provided with a plurality of extrusion parts which face the elastic ring and are distributed in the circumferential direction of the elastic ring at intervals, and when water enters the water inlet, the movable part is driven by water pressure to move towards the side where the elastic ring is located. Each extrusion part is close to or in contact with or extrudes the elastic ring, and a water passing gap communicated with the water flow cavity and the water outlet is formed between every two adjacent extrusion parts. The movable part is arranged, the area of the pressed face of the movable part is easily larger than that of the pressed face of the elastic ring, and therefore the high-sensitivity flow control valve is high in sensitivity and constant in flow control.

The invention discloses a test device and a test method for simulating steel bar corrosion in different environments, the test device comprises a sealing box, a plurality of electrolytic tanks with simulation liquid are arranged in the sealing box, and working electrode-steel bar samples are placed in the electrolytic tanks; a reference electrode and an auxiliary electrode are arranged above the electrolytic tanks, and the reference electrode and the auxiliary electrode are controlled to enter different electrolytic tanks when the steel bar corrosion process is regularly measured; and the voltage-stabilizing galvanostat and the electrochemical test computer acquisition equipment are connected outside the electrolytic tank and are used for monitoring the time-varying rule of steel bar corrosion in different periods. According to the invention, the problems of large test result difference, poor repeatability and the like caused by complexity and instability of current sample storage environment conditions are solved; the key factors of steel bar corrosion are accurately mastered by controlling external condition variables, and meanwhile, the influence degrees of different factors on the steel bar corrosion process are selectively controlled according to the required test conditions.