269 results about "Voltmeter" patented technology

The invention provides a display device and a display method. The display device comprises a display panel and a driving chip, the driving chip comprises a voltage regulating unit, an overvoltage driving unit and a triggering unit; the trigger unit is used for detecting whether the current display picture of the display panel is a heavy-load picture or not, and when the display picture is the heavy-load picture, the trigger voltage regulation unit and the overvoltage driving unit are triggered to work cooperatively; the voltage adjusting unit is used for adjusting a target driving voltage corresponding to a target gray scale in the liquid crystal driving voltmeter, so that the lighting effect reaches the preset brightness when the display panel displays a white picture; the overvoltage driving unit is used for starting a driving function, adjusting the parameter configuration table and performing overvoltage driving on a data line of the display panel based on the parameter configuration table and the target driving voltage so as to improve the charging rate of the heavy-load picture, so that the charging rate is improved by detecting the heavy-load picture and cooperatively adjusting the voltage and overvoltage driving, and the charging efficiency is improved. The method has the advantages of improving the charging rate of a heavy-load picture, eliminating display defects and improving the display quality.

A neuromorphic device includes a plurality of resistor lines, each comprising a plurality of resistors that are serially connected to each other; one or more current sources configured to control a current flowing in each of the resistor lines to a respective current value; a plurality of capacitors configured to be electrically connected to each of the resistor lines and to sample respective voltage of each of the resistor lines representing results of neuromorphic operations; and a switch configured to connect the plurality of the capacitors in parallel after the sampling the respective voltage of each of the resistor lines, to output a sum of the results of neuromorphic operations.

A measuring system comprises a voltage converter circuit that converts and outputs a voltage between a first terminal and a second terminal, and a computing device that detects anomalies in the voltage converter circuit. The voltage converter circuit comprises: a first output circuit that outputs a first output voltage obtained by multiplying a potential of the first terminal with respect to a predetermined reference potential by a conversion gain; a second output circuit that outputs a second output voltage obtained by multiplying a potential of the second terminal with respect to the reference potential by a conversion gain; and a third output circuit that outputs a third output voltage obtained by multiplying a voltage between the first terminal and the second terminal by a conversion gain.The conversion gains of the first output circuit, the second output circuit, and the third output circuit can be set to values ​​of at least one first group and one second group, and the ratio between a first group conversion gain and a second group conversion gain set in the third output circuit differs from the ratio between a first group conversion gain and a second group conversion gain set in the first output circuit or the second output circuit.The computing device comprises the following: a voltmeter which measures the first output voltage, the second output voltage and the third output voltage, and a diagnostic unit which, using conversion gains of a selected group, which is one of the first group and the second group, calculates a first conversion value, a second conversion value and a third conversion value corresponding to input voltages of the first output circuit, the second output circuit and the third output circuit, based on the first output voltage, the second output voltage and the third output voltage, and determines that an anomaly exists if the sum of the first conversion value and the second conversion value deviates from the third conversion value by at least one predetermined value.

1. Name of the product in this design: Graphical user interface for displaying battery power in electronic devices. 2. Purpose of this design: For use as a battery power display interface on a motorcycle voltage display panel. 3. The key design features of this product are its graphical user interface content. 4. The image or photograph that best illustrates the design's key features: the front view. 5. The rear view, left view, right view, top view, and bottom view have no design points, so the rear view, left view, right view, top view, and bottom view are omitted. 6. Human-computer interaction method of graphical user interface: The main view is the full-charge state of the color screen voltmeter, that is, the state after the voltmeter is fully charged and charging is turned off when the OFF button is clicked; clicking the ON button can switch to the changing state diagram 1, the color screen voltmeter interface is in the charging state; changing state diagram 2 is the low battery display of the color screen voltmeter; changing state diagram 3 is the discharge short circuit protection state of the color screen voltmeter.

The invention discloses a voltage detection method, a voltage detection device, electronic equipment and a computer readable storage medium, the detection method is applied to the electronic equipment, and the detection method specifically comprises the following steps: under the condition that the electronic equipment is accessed to a preset network, respectively sending channel establishment instructions to at least two target voltmeters, establishing a communication channel with each target voltmeter; the target voltmeter is a voltmeter determined by the electronic equipment based on a preset method; sending a network connection instruction to each target voltmeter based on the communication channel corresponding to each target voltmeter so as to instruct each target voltmeter to access a preset network; the network connection instruction comprises networking information of a preset network; detection voltages sent by the target voltmeters are received based on a preset network so as to complete voltage detection, and the detection voltages are voltages obtained by detecting the corresponding detection points through the target voltmeters. According to the method, different voltage detection scenes can be flexibly and efficiently coped with, so that the reliability of voltage detection is improved.

A photoelectric converter sensitivity adjusting device and method, comprising a light source module, a shielding cage, an optical fiber bundle, an optical power meter, a power supply, a photoelectric converter and a voltmeter, the light source module is used to generate test light, one end of the shielding cage is provided with a small hole for receiving the test light, the other end is provided with an optical fiber bundle connector connected with the optical fiber bundle, the test light entering the shielding cage from the small hole enters one end of the optical fiber bundle from the optical fiber bundle connector, the optical power meter is used to test the optical power emitted from the other end of the optical fiber bundle, the photoelectric converter has an optical fiber bundle connector and an output signal line, the optical fiber bundle connector is used to be detachably connected to the other end of the optical fiber bundle, and the voltmeter tests the output voltage of the photoelectric converter; the photoelectric converter is provided with a sensitivity adjusting resistor, and the output voltage can be changed under the same light intensity excitation. The device can shield the interference of environmental light in ordinary experimental environment, accurately adjust the sensitivity of the photoelectric converter, and has the advantages of low cost, high detection efficiency and convenient operation.

A method (100) of operating a flyback converter (250) to charge a DC link capacitor (210), with the steps of: determining (120) a voltage (Ux), characterizing the voltage at the DC link capacitor (210), specifying (140) a target charging current level (I_L) for charging the DC link capacitor (210) and specifying a corresponding duty cycle (Tx) for actuating the first circuit breaker (252) for as long as the determined voltage (Ux) falls below a first voltage level value (U1), specifying (150) a target charging voltage level (U_L), for as long as the determined voltage (Ux) corresponds to the first voltage level (U1) or the determined voltage (Ux) exceeds the first voltage level (U1) and the determined voltage (Ux) falls below a second voltage level (U2).

The utility model discloses a multifunctional battery box, which solves the technical problems that a battery is easy to shake and shift in the battery box and the current and voltage of the battery cannot be monitored at any time, and comprises a box body, a battery fixing mechanism is arranged at the bottom of an inner cavity of the box body, and a voltmeter is arranged on the front wall of the box body close to the left side. The ammeter is arranged on the right side of the voltmeter, the positioning mechanisms are arranged on the ammeter and the voltmeter respectively, a threading opening is formed in the front wall of the box body, and the voltmeter and the ammeter can monitor a battery through mutual cooperation of the fixed plate, the multidirectional lead screw, the positioning plate, the fixed frame, the movable frame and the like; the voltmeter, the ampere meter and the switch fuse can be replaced conveniently if damaged, the switch fuse can protect the battery during use, in addition, the battery can be clamped by the two fixing plates by rotating the multidirectional lead screw, and the problem that the battery shakes is effectively avoided.

1. The name of the design product: standard cell. 2. The use of the design product: standard cell is a kind of electromotive force standard device, which can save and transfer electromotive force standard. It can be used as a reference standard of potentiometer or for calibration of digital voltmeter. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.

The utility model belongs to the technical field of transformer performance detection, and particularly relates to a portable transformer loss test power box which is characterized by comprising a suitcase shell, a panel and a three-phase compensation power capacitor, the panel and the three-phase compensation power capacitor are both accommodated in the suitcase shell, and the panel is connected with the three-phase compensation power capacitor. An input ammeter, an input voltmeter, an output ammeter, an output voltmeter, an input side connector socket and an output side connector socket are arranged on the panel; three groups of three-phase compensation power capacitors are arranged, and three fling-cut switches are correspondingly arranged on a panel; the input side connector socket is connected with a voltage regulator through a cable, and the output side connector socket is connected with a to-be-tested transformer through a cable. The beneficial effects of the utility model are that the portable box-type structure is adopted, which is convenient to carry and is especially suitable for the on-site loss test of a large-scale transformer; the switching type three-phase compensation power capacitor can be suitable for various transformer models and is high in universality; the method is very suitable for transformer loss batch test operation.

The utility model discloses a compact sludge specific resistance measuring device relates to sludge specific resistance measuring technical field, wherein, compact sludge specific resistance measuring device includes box, vacuum pump, monitoring module and three -way valve, and the box has the cavity, and the rear side of box is equipped with the heat dissipation hole, and the vacuum pump is installed in the cavity, and monitoring module is installed in the cavity, and monitoring module is electrically connected with vacuum pump, to monitor the running condition of vacuum pump, and monitoring module includes the timer, voltmeter, pressure gauge, timing switch and vacuum pump switch that show in the front of box, and three -way valve is located the side portion outside the box, and vacuum pump is connected with two different filtrate containers respectively through three -way valve. The utility model discloses adopts mesa formula design, and the volume of device is reduced, and through the design three -way valve, can realize the synchronous suction filtrate of two different filtrate containers, improves the suction efficiency.

This invention discloses an active coupling cavity device and calibration method for calibrating a standard microphone. A sound source adapter is located at the signal input end of the active coupling cavity. A multi-channel sound field distribution structure is located within the active coupling cavity, comprising eight acoustic channels evenly distributed circumferentially along the central axis of the active coupling cavity. A symmetrical clamping assembly constrains the reference microphone and the microphone under test to be symmetrical about the central axis of the active coupling cavity. A coaxiality test ring assembly rigidly constrains the axes of the reference microphone and the microphone under test to coincide with the central axis of the active coupling cavity. The calibration test system includes a signal generator, a sound level meter under test, a preamplifier, a measurement amplifier, a bandpass filter, and a digital voltmeter. The multi-channel uniformly distributed sound field structure solves the problem of uneven sound pressure distribution caused by unidirectional input, and the symmetrical clamping assembly and the coaxiality test ring assembly respectively solve the problem of poor consistency in low-frequency and high-frequency phase measurements.

In some examples, a circuit include a class-D amplifier configured to receive an input signal and provide a drive signal based on and responsive to the input signal for driving an output device. The circuit also includes a current sensing circuit coupled to the class-D amplifier and configured to provide voltage signals representative of current flow through the class-D amplifier. The circuit also includes a current measurement circuit coupled to the current sensing circuit and configured to provide a first and second voltage difference signals derived from the voltage signals. The circuit also includes a current summing circuit coupled to the current measurement circuit and configured to determine a first current signal representative of the first voltage difference signal, determine a second current signal representative of the second voltage difference signal, and combine the first and second current signals to form a current sum signal. The circuit also includes a converter circuit coupled to the current summing circuit and configured to convert the current sum signal to a voltage representation.

The objective is to provide an electromagnetic pump malfunction detection device that can accurately determine whether or not there is a malfunction in the pump without being affected by external vibrations. [Solution] The configuration of the electromagnetic drive pump abnormality detection device according to the present invention is an electromagnetic drive pump abnormality detection device that pumps fluid by causing a plunger to reciprocate using an electromagnetic coil, and comprises a varistor inserted in parallel with the electromagnetic coil, a voltmeter arranged on a drive circuit that supplies power to the electromagnetic coil, and a determination unit that determines an abnormality from the value acquired by the voltmeter, wherein the determination unit acquires the minimum value V1 of the voltage after a first predetermined time Ta has elapsed from the falling edge of the drive voltage and before a second predetermined time Tb has elapsed, and if the minimum value V1 falls below the threshold V0, it determines that the plunger is operating normally and that it is functioning normally, and if the minimum value V1 does not fall below the threshold V0, it determines that the plunger is locked and that it is functioning abnormally.

A measuring unit for a target member is adapted to be submerged into a body of water. The measuring unit has a connector adapted to be in electrically conducting contact with the target member, at least a portion of the connector being in fluid communication with the environment ambient of the measuring unit; a reference electrode at least a portion of which being in fluid communication with the environment ambient of the measuring unit; a voltmeter electrically connected to each one of the connector and the reference electrode whereby the voltmeter is adapted to determine a potential difference value indicative of a potential difference between the connector and the reference electrode, and a consumer assembly adapted to consume electric energy.

The utility model discloses a kind of MCDU multifunctional control display test bench, belong to test equipment technical field, including test bench body, the front end surface of test bench body is bolted with panel, the surface of panel is respectively set as MCDU area and ARINC area;The top of MCDU area is provided with voltmeter and ammeter, the bottom of MCDU area is provided with connecting cable and first control switch, the connecting cable and first control switch are all arranged directly below voltmeter and ammeter;The top of ARINC area is provided with data interface and second control switch, the bottom of ARINC area is provided with external input interface;The rear end surface of test bench body is provided with power cable interface, the inside of test bench body is provided with transformer, to improve the test range of MCDU multifunctional control display test bench, increase MCDU multifunctional control display test bench applicability.

The invention discloses resistor rated power detection equipment and a detection method thereof. The resistor rated power detection equipment comprises a constant temperature and humidity chamber, a water cooling plate, a cooling liquid circulating pump, a plurality of PCB test boards, a voltmeter, a direct current source and a temperature display. The water cooling plate is arranged in the constant-temperature and constant-humidity chamber, a winding cooling liquid circulating pipe is arranged on the water cooling plate, and the cooling liquid circulating pump is connected with the cooling liquid circulating pipe; the voltmeter is connected with a voltage test end on each PCB test board, and the direct current source is connected with a current access end on each PCB test board; a resistor to be detected is placed on each PCB test board, and a thermocouple temperature sensor for detecting the real-time temperature of the resistor is arranged on each PCB test board. According to the invention, rated power detection can be simultaneously carried out on a batch of resistors within a certain temperature range, so that the electrical performance of the batch of resistors can be reflected more comprehensively.

A built-in vibrator control system of a low-voltage electronic variable frequency motor belongs to the technical field of engineering machinery. According to the technical scheme, the control system is composed of four vibrators with built-in motors, a machine frame, a frequency conversion control cabinet, a grounding wire and a low-voltage electronic frequency converter. A cable of the vibrator with the built-in motor is inserted into the frequency conversion control cabinet through an industrial plug and is tightly and reliably fixed with the rack; a system circuit is composed of an air switch, a voltmeter, an ampere meter, a frequency meter, an indicating lamp, a thermal relay, an intermediate relay, a cooling fan, a low-voltage electronic frequency converter and a matched remote control device. A circuit of the frequency conversion control cabinet is divided into a manual unit and a remote control unit which can be switched to start, operate and reset. The system has the advantages of overcoming the defects of an existing system, guaranteeing vibration compaction quality, achieving mechanization and intellectualization of concrete compaction construction, and being high in operation efficiency, good in compaction effect, novel in design, reasonable in structure, comfortable to operate, easy and convenient to maintain, safe and reliable.

The invention relates to the technical field of metering related to green hydrogen production, and provides an electrical performance metering and testing device and method for a renewable energy hydrogen production system. Comprising a renewable energy power generation side assembly, an electrolytic hydrogen production side assembly, a main controller, a first data acquisition controller, a second data acquisition controller, a variable resolution digitizer, a voltage acquisition module, a current acquisition module, a broadband resistance voltage divider, a broadband current sensor, a voltage range selection assembly, a current range selection assembly and a synchronous scanning switch. A first digital voltmeter, a second digital voltmeter and a direct current sensor. The device is an integrated correlation test platform, solves the problem that no synchronous test platform exists in the prior art, and realizes synchronous measurement of parameters of a power generation side and a hydrogen production side. As an energy value analysis tool of a renewable energy hydrogen production system, an operation model of the system is verified, and performance evaluation and dynamic characteristic research are carried out.

A testing system calibration instrument (134) includes a plurality of device inputs (136), a plurality of signal processing units (138), a display device (139), a controller (140) and a housing (141) that unifies the components. The plurality of signal processing units (138) includes two or more of a millivolt / volt signal reader (138A) configured to produce a first calibration signal (146A) based on a millivolt / volt signal (136A) received from a first calibration sensor (144A) through one of the device inputs (136), a decoder (138B) configured to produce a second calibration signal (146B) based on an encoded signal (136B) received from a second calibration sensor (142B) through one of the device inputs (136), and a voltmeter (138C) configured to produce a third calibration signal (146C) based on an analog voltage signal (136C) received from a third calibration sensor (142C) through one of the device inputs (136). The controller (140) is configured to control the display device (139) to display information relating to the first calibration signal (146A), the second calibration signal (146B) and / or the third calibration signal (146C).

A spiking neural network (SNN) system is disclosed having spiking neurons associated with clause values associated with a satisfiability (SAT) problem. Each spiking neuron generates a voltage spike when on input voltage applied to each spiking neuron is increased above a spiking voltage threshold. The input voltage that is increased above the spiking voltage threshold is indicative that the corresponding clause value is satisfied. A controller applies the clause grid that includes clause values to a literal grid that includes literal values. The controller generates the input voltage that is applied to each spiking neuron based on each corresponding clause value associated with each spiking neuron that is applied to the literal values. The controller determines that each clause value is satisfied when the corresponding spiking neuron generates the voltage spike and that each clause value is unsatisfied when the corresponding spiking neuron fails to generate the voltage spike.

The embodiment of the invention provides a rotor position determination method and device of a synchronous reluctance motor, equipment and a medium. The method comprises the following steps: acquiring stator data at the current moment; wherein the stator data comprises stator voltage and stator current; based on an equivalent transmission line model, according to the stator data at the current moment and the incident voltage at the previous moment, determining the back electromotive force at the current moment; wherein the equivalent transmission line model represents a physical model for enabling stator inductance to be equivalent to a short-circuit transmission line, the equivalent transmission line model is used for determining back electromotive force, the back electromotive force represents the magnetic resistance characteristic of a rotor of the synchronous reluctance motor, and the incident voltage represents the initial state of voltage waves propagating in the short-circuit transmission line; determining rotor position information at the current moment according to the back electromotive force at the current moment; wherein the rotor position information comprises a rotor electrical angle and a rotor electrical angular velocity. The method is used for achieving the effect of improving the adaptability and precision of determining the rotor position of the synchronous reluctance motor.

The present application relates to a pixel driving method, a display device, a timing controller and a storage medium. The method is applied to the timing controller, and the method comprises the following steps: receiving an image to be displayed, and generating first voltage data according to the image to be displayed pixel by pixel; when processing a current pixel row, judging whether the first voltage data is same as second voltage data, wherein the second voltage data is voltage data sent by the timing controller to a pixel driver when processing a previous pixel row; if the first voltage data is same as the second voltage data, sending the first voltage data to the pixel driver; if the first voltage data is not same as the second voltage data, obtaining third voltage data from a preset overdrive voltage table, and sending the third voltage data to the pixel driver. The pixel driving method can solve the problem that when the current row triggers the line OD, the next row data is same as the current row data, the line OD is not triggered, and the next row cannot reach the target gray scale, thereby improving the charging problem caused by the opening of the line OD function.

1. The name of the design product: voltmeter (D5 and T3). 2. The use of the design product: the design product is used for connecting various DC interface power adapters, various USB chargers, mobile terminals and other electronic products to display real-time power-on parameters. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: design 1 perspective view 1. 5. Design 1 is designated as the basic design.

The utility model discloses a kind of overvoltage and undervoltage acousto-optic alarm protection devices of heat exchange station, including monitoring device, overvoltage and undervoltage protection system, power supply system, alarm system and test system, the monitoring device includes voltmeter installed in input, the overvoltage and undervoltage protection system includes overvoltage and undervoltage protector, overvoltage and undervoltage protector compares with rated power supply to the power supply voltage of detection input, if input side voltage is higher than rated voltage, protection system action disconnects circuit and plays a protective role, if input side voltage is lower than rated voltage, protection system action disconnects circuit and plays a protective role, the power supply system includes 12V direct current power supply, lithium battery group provides power supply for alarm system, the alarm system includes sound-light alarm, the test system includes test switch to test whether alarm system is normal work, the utility model relates to heat exchange station control system power protection technical field.The device plays overvoltage protection, undervoltage protection, power flash protection for heat exchange station control system power, reduces the failure frequency of control system electrical equipment, saves cost, guarantees the stable and safe operation of heat exchange station control system.

The invention discloses equipment for detecting the service life of a conductive rolling ring. The equipment can dynamically simulate working conditions and test wear characteristics at multiple rotating speeds. The device is composed of a servo motor, a coupler, a rotating shaft, a fixed rack, a conductive rolling ring, a conductive rolling ring fixing frame, a fixed beam supporting base and a machine outer cover. The servo motor drives the rotating shaft through the coupler, the rotating shaft is assembled in the fixing shaft, and the rotating shaft is connected with a bearing in the fixing shaft. The fixed end and the rotating end of the conductive rolling ring are respectively connected to a volt-ammeter. Through the real-time work of the conductive rolling ring, the voltage and current change is monitored in real time, and the contact resistance and wear rule is analyzed. Compared with static detection, the device dynamically simulates working conditions, synchronously obtains rotating speed-voltage and current data, evaluates durability and contact stability of the conductive rolling ring, provides support for material selection and life prediction, and is suitable for reliability verification of high-precision rotary conductive parts.

This invention provides a threshold voltage adjustment circuit that allows for easy adjustment of the threshold voltage. [Solution] The threshold voltage adjustment circuit 10 includes a reference current circuit 20 and a transimpedance circuit 30. The reference current circuit 20 outputs a reference current formed on the substrate. The transimpedance circuit 30 has multiple resistors on the substrate and the threshold voltage V is expressed as a function of the combined resistance of the multiple resistors and external resistors and the reference current. TH Outputs.

The invention discloses a quick lap joint device for an overhaul test power supply, which comprises a shell, a contact arranged at the bottom end of the shell and a socket arranged on the shell, and is characterized in that the end part of the contact is connected with the socket through a wire; the contact is used for being in contact with an electrified terminal of an electrified device, and when the contact and the electrified terminal are in contact and electrified, the socket is electrified at the same time; the first contact head and the second contact head on the shell are aligned with the lower terminal of the air switch to be pushed in, after the contacts are in contact with the L terminal and the N terminal, the voltmeter displays the current voltage value, the electrification is normal, the locking mechanism operation handle is shifted, the locking mechanism eccentric wheel rotates, and the shell is locked on the air switch in cooperation with the retaining piece. The elastic contact is ensured not to get power from the air switch; the technical problem that in the prior art, when a power box is overhauled, a plug needs to be disassembled, a copper wire is adopted for direct power connection, and a wire head is exposed to cause high lap joint risk is solved.

A three-phase asynchronous motor winding head and tail end tester comprises a box body (1), and a power supply module used for supplying power, a binding post module used for providing an equipment interface, a voltmeter display unit used for displaying detection data and an operation conversion control unit are arranged in the box body (1). The device has the advantages of improving the test efficiency, remarkably shortening the test time due to the quick test function, and improving the motor maintenance and production efficiency. A hardware structure and an induced voltage processing algorithm are optimized, so that the reliability of a test result is ensured, and motor faults caused by misjudgment are reduced.

The application discloses a control system of a pulse sequence control triangular wave current mode soft switching Buck converter, the Buck converter comprises a direct current input power supply, a first switching tube, a second switching tube, an inductor, an output capacitor and a load, the positive pole of the direct current input power supply is connected with one end of the second switching tube and one end of the inductor through the first switching tube, the other end of the inductor is connected with one end of the output capacitor and one end of the load, the other end of the output capacitor, the other end of the load and the other end of the second switching tube are connected with the negative pole of the direct current input power supply, and the control system comprises a PT controller, a voltmeter for detecting and collecting a voltage signal between the load and a current meter for collecting an inductor current, wherein the input end of the PT controller is connected with the output end of the current meter and the output end of the voltmeter, the output end of the PT controller is connected with the control end of the first switching tube and the control end of the second switching tube, and the control system can control the size of negative current and has a relatively simple structure.