40results about How to "The voltage value is accurate" patented technology

An ink jet application device comprises an application head, an information storage, a first converter, a second converter, a third converter, a three-terminal regulator and a switching circuit. The application head has a plurality of nozzles and a plurality of actuators respectively mounted to the nozzles, and sprays ink from a nozzle by applying a voltage to an actuator. The information storage stores a specific volume of an ink-droplet, characteristic information for relating a volume of the ink-droplet to a voltage value to be applied to the actuator, and setting information for relating a voltage value to be applied to the actuator to a DA setting value. The first converter obtains a volume of the ink-droplet sprayed from a nozzle which is a voltage correcting object, calculates a voltage value related to the volume of the ink-droplet with reference to the characteristic information, and calculates a voltage difference value between the calculated voltage value and a voltage value related to a specific volume of the ink-droplet. The second converter converts the voltage difference value into a DA setting value with reference to the setting information. The third converter converts the DA setting value into an analog signal. The three-terminal regulator outputs a correction voltage when the analog signal is input thereto as a reference voltage. The switching circuit supplies the correction voltage to the actuator mounted to the nozzle which is the voltage correcting object.

A reference voltage generating circuit comprises: a monitor circuit, including a low threshold voltage PMOS transistor, a low threshold voltage NMOS transistor, and a resistor having a predetermined resistance which are connected in series, for generating a reference voltage at one end; and an additional circuit for supplying a monitor current to the monitor circuit and for controlling the other end of the monitor circuit to be at a constant voltage, wherein a voltage value of the reference voltage is corrected within a range corresponding to a process fluctuation from a predetermined center value, based on the monitor current changing in response to the process fluctuation.

An apparatus for battery state estimation can accurately estimate the internal state of a battery by taking into consideration the slow response portion of the battery. The apparatus for battery state estimation includes a charge / discharge current detection unit, a terminal voltage detection unit, an equivalent circuit model including a fast response portion and slow response portion of the battery, a sequential parameter estimation unit that performs sequential parameter estimation, using only the fast response portion among response portions, based on the charge / discharge current value and the terminal voltage value, a constant setting unit that sets a constant representing resistance and capacitance in the slow response portion of the equivalent circuit model, a plurality of multiplication units that multiply the parameter estimated by the sequential parameter estimation unit and the constant by the charge / discharge current value, and an addition unit that obtains an overvoltage value of the battery by adding the multiplied values.

The invention discloses an automobile wide-range air / petrol ratio measurement sensor, adopting a flat battery oxygen sensor, which comprises an oxygen pump battery formed by a solid electrolyte and at least two oxygen pump electrodes respectively formed at two side surfaces of the solid electrolyte; an oxygen measurement battery formed by a solid electrolyte, at least one induction electrode at the side surface of the solid electrolyte at a measurement cavity and at least one reference electrode at the side surface of a reference condition, wherein the oxygen pump battery and the oxygen measurement battery are parallel arranged, the oxygen pump battery is arranged more near the object gas than the oxygen measurement battery. The automobile wide-range air / petrol ratio measurement sensor can improve measurement accuracy, reduce sensor activation time, improve reliability and durability of oxygen sensors, and reduce manufacture difficulty and cost, thereby resolving the defects of the prior flat dual-battery oxygen sensors.

The invention relates to the technical field of frequency converters, in particular to a frequency converter with the rotating speed tracking function and a rotating speed tracking method with the frequency converter. The frequency converter comprises a sampling circuit, an amplification adjusting circuit, a shaping circuit and an isolation output circuit, wherein the sampling circuit is connected with any two phases in an output circuit of a motor, and the amplification adjusting circuit, the shaping circuit and the isolation output circuit are sequentially connected according to the circuit flow direction sequence. In the amplification adjusting circuit, after difference amplification and waveshape conversion are carried out on residual voltage signals, shaping is carried out through the shaping circuit, and the frequency of pulse signals is calculated by controlling a processor. The residual voltage frequency of the motor is detected and processed through a hardware circuit to obtain the more accurate voltage value, then the voltage value is utilized for achieving rotating speed tracking of the motor, and the rotating speed of the motor is obtained. Due to the fact that the residual voltage signals of the motor can be directly obtained from the motor, repeated attempts are not required, the reaction time is greatly shortened, the impact caused by a current to equipment is also reduced, efficiency is greatly improved, misinformed current faults of the equipment are reduced, and the service life of the equipment is prolonged.

The invention provides a signal collecting circuit which comprises a power supply VCC (Voltage To Current Converter) and a bridge circuit, wherein the bridge circuit is connected with the power supply VCC and used for receiving a voltage provided by the power supply VCC; a first resistor and a temperature sensor are connected with each other in series to form a first bridge arm; a second resistor and a third resistor are connected with each other in series to form a second bridge arm; the first bridge arm and the second bridge arm are connected between the power supply VCC and a ground level in parallel; the temperature sensor in the first bridge arm is connected with the ground level; and resistances of the resistors, which are positioned in the first bridge arm and the second bridge arm and connected with the power supply VCC, are equal to each other. A voltage measuring circuit is respectively connected with middle ends of the two bridge arms of the bridge circuit, so as to measure the voltage value of the temperature sensor from the bridge circuit; the measured voltage values are only the voltages at two ends of the temperature sensor; the resistance of a lead wire connected between the temperature sensor and a detected point does not affect the voltage value of the temperature sensor, measured by the voltage measuring circuit, so that the calculated temperature value is accurate.

A reference voltage generating circuit comprises: a monitor circuit, including a low threshold voltage PMOS transistor, a low threshold voltage NMOS transistor, and a resistor having a predetermined resistance which are connected in series, for generating a reference voltage at one end; and an additional circuit for supplying a monitor current to the monitor circuit and for controlling the other end of the monitor circuit to be at a constant voltage, wherein a voltage value of the reference voltage is corrected within a range corresponding to a process fluctuation from a predetermined center value, based on the monitor current changing in response to the process fluctuation.

The invention discloses a method for measuring the electric energy loss of a high-energy-consumption smelting system and relates to the field of detection. The method includes the following steps that firstly, a sensor is selected and installed; secondly, a sampling period is determined; thirdly, sampling is carried out; fourthly, the total electric energy quantity of all measuring points is acquired; fifthly, an electric energy loss value is acquired; sixthly, the electric energy loss value is output. According to the method, professional sensors like a PT is selected, accurate current and voltage values of measuring positions are acquired, and a foundation is laid for improving the accuracy of electric energy loss measurement; then, data are collected through a high-frequency analog-digital converter, the spline interpolation error compensation algorithm is utilized, and therefore a more accurate measured value is acquired, the total electric power and the total electric energy quantity value of all the measuring points can be calculated accordingly, and accurate electric energy loss conditions can be acquired according to an electric energy loss formula. The method is convenient to operate and has high market promotion and application value.

The invention relates to a fiber grating voltage sensor. The fiber grating voltage sensor comprises piezoelectric ceramic, a fiber grating A, a fork device and a fiber grating B, wherein the fork device is a signal amplifying device. Voltage is converted into deformation of the piezoelectric ceramic by utilizing the inverse piezoelectric effect of the piezoelectric ceramic, the deformation is amplified through the fork device and transmitted to the fiber gratings, and temperature effect correction is performed through the fiber grating B. The high-sensitivity fiber grating voltage sensor is used for remotely monitoring voltage and acquiring sensitive and stable voltage signals.

An ink jet application method employed in an ink jet application device so as to apply a certain voltage to an actuator mounted to a nozzle and spray an ink-droplet from the nozzle by a uniform volume, including reading characteristic information for relating a volume of the ink-droplet to a voltage value to be applied to the actuator; calculating a voltage value related to the volume of the ink-droplet sprayed from the nozzle which is a voltage correcting object with reference to the characteristic information; calculating a voltage difference value between the calculated voltage value and a voltage value related to a specific voltage to the voltage difference value to the actuator mounted to the nozzle which is the voltage correcting object.

The invention relates to a method, system, vehicle, storage medium and electronic device for balancing batteries, the battery balancing system comprises a balance module, an acquisition module and a control module, the control module is connected with an acquisition module and balance module corresponding to the same single battery through a channel, and the acquisition module and the balance module commonly uses the channel at time divisions. The method comprises the following steps: the control module acquires a voltage value of each single battery through the acquisition module corresponding to each single battery in the battery pack; the control module determines a reference voltage value required by balance judgment according to the voltage value of each single battery in the batterypack; and the control module determines the single battery to be balanced according to the voltage value of at least one single battery in the battery pack and the reference voltage value.

The invention provides an MPPT control method and device, a photovoltaic power generation device and a computer readable storage medium. The MPPT control method comprises the following steps of acquiring at least one of the following parameter information of illumination intensity, environment temperature and illumination time; inputting the parameter information into a preset RBF neural network to obtain a voltage value corresponding to the global maximum power point of a photovoltaic system, wherein the preset RBF neural network is obtained by the following training steps of acquiring the positive sample information, wherein the positive sample information comprises the parameter information; training the RBF neural network by using the positive sample information until the difference between the output of the RBF neural network and the target output is less than a predetermined threshold; and taking the RBF neural network as the preset RBF neural network. According to the invention,the problems of low precision and slower response of the MPPT control method in the prior art are solved, the local optimization problem during neural network optimization is also avoided, and the precision and speed of the prediction control are improved.

The invention relates to the field of aircraft ground test, and discloses a test device applicable to height indicator simulation test. The test device comprises a simulation signal generation circuit, wherein the simulation signal generation circuit comprises a voltage sharing circuit and a voltage stabilizing circuit; the voltage stabilizing circuit comprises a diode circuit and an impedance circuit which is in circuit connection with the diode circuit in parallel; the input end of the voltage sharing circuit is in circuit connection with an external power input; the output end of the voltage sharing circuit is in circuit connection with the input end of the voltage stabilizing circuit; and the output end of the voltage stylizing circuit externally outputs an simulation current signal for the height indicator simulation test. By the technical scheme, during the height indicator simulation test, the precision of the simulation signal can be improved, and the flexibility and the practicability of the test device are improved.

The invention discloses a temperature drift reducing device, which is characterized by comprising a computer, a singlechip, a regulable potentiometer, an operational amplifier circuit and a four-channel analogue-to-digital (A / D) converter, wherein the computer controls the transmitting and receiving of data and is bidirectionally connected with the singlechip; data communication between the computer and the singlechip adopts an RS232 protocol; the singlechip is in input connection with the regulable potentiometer and is bidirectionally connected with the four-channel analogue-to-digital (A / D) converter; the regulable potentiometer is in monodirectional input connection with the operational amplifier circuit; and the operational amplifier circuit is respectively in input connection with the four-channel analogue-to-digital (A / D) converter and an infrared focal plane array.

The invention relates to a measuring instrument, a method for measuring currents and a method for measuring mobile phone charging currents. The measuring instrument comprises a voltage measuring channel and a resistor, wherein the voltage measuring channel is provided with a connecting end, the resistor is parallelly connected with the voltage measuring channel by connecting with the connecting end, and the resistor is used for being serially connected into a to-be-measured current path. The measuring instrument has the advantages that currents can be measured by parallelly connecting the resistor with the voltage measuring channel, impedance is lowered, and the voltage measuring channel of the measuring instrument is utilized effectively.

The invention discloses a feedback circuit for compensating line loss voltage. The feedback circuit is used for compensating the line loss voltage caused by line loss resistance in a power output circuit. The circuit comprises a current detection module, a voltage outer loop feedback module and an output current inner loop feedback module; the current detection module is used for detecting outputcurrent Io of the feedback circuit in real time through a sampling resistor Rc; the voltage outer loop feedback module is used for introducing the line loss voltage Us calculated according to preset line loss resistance Rs and the output current Io, combining the line loss voltage Us, reference voltage VREF and a voltage feedback value Uop on a load and outputting an outer loop feedback voltage deviation Uob; the output current inner loop feedback module is used for combining the received outer loop feedback voltage deviation Uob with output voltage UIo corresponding to the output current andoutputting an inner loop feedback circuit voltage EAP signal to a power chip. The line loss voltage is compensated by increasing an expected value of the output voltage, the voltage which is output bya switch power supply and connected to a load terminal is more accurate, and meanwhile the maximum value of the output current can be limited for short circuit protection.

A light emitting device has a plurality of pixels, each of which includes a drive transistor, a light emitting element and signal lines, a property parameter acquisition circuit which acquires property parameter, a signal correction circuit that generates a corrected gradation signal by correcting the image data based on the property parameter, and a drive signal impressing circuit that impresses a drive signal, generated based on the corrected gradation signal, on the pixel to drive it. The property parameter is constituted of a threshold voltage, a current amplification factor and its irregularity of the drive transistor, and is acquired based on measured voltages of the signal lines after each of a plurality of predetermined settling times elapses from the time when the light emitting device cuts off a voltage subsequent to impressing the voltage on each pixel for a predetermined length of time.

The invention discloses a battery high-voltage detection device, a battery, a power system and an automobile. The battery high-voltage detection device comprises a high-voltage detection module and amain controller which are separated from each other. The high-voltage detection module comprises an acquisition circuit, a slave controller and a first wireless communication module; the acquisition circuit acquires an electric signal of a high-voltage loop of the battery, converts the electric signal into a digital signal and transmits the digital signal to the slave controller; the main controller is provided with a second wireless communication module, and the second wireless communication module receives the digital signal from the first wireless communication module. Due to the fact thatthe high-voltage detection module and the main controller are arranged on different circuit boards of the battery high-voltage detection device, compared with the mode that the high-voltage detectionmodule and the main controller are arranged on the same circuit board, electromagnetic interference of the high-voltage detection module to the main controller is avoided. Therefore, the voltage valueof the high-voltage loop calculated by the main controller is accurate, and safe and stable operation of an automobile is guaranteed.

The invention relates to a minority carrier lifetime tester probe and a minority carrier lifetime tester and belongs to the technical field of semiconductor minority carrier lifetime testing. The probe comprises an outer housing and a probe body, and is characterized in that a cylindrical cavity is disposed in the center of the outer housing, wire pipelines are arranged on the left and right sides of the cylindrical cavity symmetrically and lead to the cylindrical cavity, laser accommodating chambers are arranged at the lower ends of the wire pipelines and communicates with the wire pipelines, laser radiation channels are arranged on the end portions of the inner side ends of the laser accommodating chambers, the probe body is provided with a wire receiving section and a probe needle clamping section from top to bottom, and fixing clamps are disposed inside the probe clamping section symmetrically in front and back and clamp a probe needle. The minority carrier lifetime tester comprises a control module and a power supply module, an AD acquisition module and a counting module which are electrically connected with the control module. The minority carrier lifetime tester probe is stable in overall structure and compact and reasonable in configuration. The minority carrier lifetime tester is more portable, more accurate in test accuracy, and suitable for popularization and application.

The invention discloses a sampling circuit and electronic equipment. The sampling circuit comprises a constant current source device, a diode, an auxiliary voltage device, a first resistor and a voltage sampling device, wherein the constant current source device comprises a voltage amplifier and an operational amplifier, one end of the first voltage amplifier is connected with the output end of the operational amplifier, and the second end of the voltage amplifier is connected with the output end of a front-end voltage device; the cathode of the diode is connected between the second end of the voltage amplifier and the output end of the front-end voltage device; the auxiliary voltage device is connected with the anode of the diode; the first end of the first resistor is connected between the auxiliary voltage device and the anode of the diode, and the second end of the first resistor and the third end of the voltage amplifier are respectively connected with the first input end of the operational amplifier and simultaneously grounded; and the first end of the voltage sampling device is connected between the auxiliary voltage device and the anode of the diode and is connected with the first end of the first resistor.

A spectroscopic measurement device includes a light receiving element that receives light and outputs a light receiving signal, a variable amplification circuit that amplifies the light receiving signal which is input, and a dark voltage correction unit that calculates a correction coefficient that is a rate of change of a dark voltage value with respect to gains, based on an output value of the variable amplification circuit with each value of two or more gains which are equal to or greater than a predetermined value in an environment where no light is incident on the light receiving element.

Disclosed is a polyphase type voltage conversion system. The polyphase type voltage conversion system comprises an input power supply, multiple voltage conversion units, a pulse-width modulation controller and multiple voltage detection units. The pulse-width modulation controller is used for outputting multiple pulse-width modulation signals with different phases; each voltage conversion unit comprises a diverter switch and an inductor; each voltage detection unit comprises a sampling switch which synchronizes switching with the diverter switch, and a voltage detector electrically connected with the pulse-width modulation controller; each voltage detector is electrically connected with one corresponding inductor through the sampling switch for detecting the voltage value of the corresponding inductor and outputting the voltage value to the pulse-width modulation controller; and the pulse-width modulation controller is also used for calculating an average value of received voltage values, comparing each voltage value respectively with the voltage average value, and correspondingly adjusting the duty ratio of a pulse-width modulation signal outputted to a corresponding voltage conversion unit according to a comparison result.

The invention relates to the technical field of conductor resistance measurement, and in particular relates to a conductor direct current resistance testing method. The method comprises the steps of cutting off a conductor at a potential pole to form a middle section and end sections positioned at two ends of the middle section, connecting the middle section and the end sections through crimping pipes of which the interiors are axially through, filling a conductive material between the middle section and the end sections in the crimping pipes, and crimping two ends of the crimping pipes with the middle section and the end sections respectively. The crimping can enable the paint films of monofilaments at the joints of the middle section and the end sections of the conductor and the crimping pipes to be broken, so that the monofilaments are in full contact, full contact of the monofilaments at the potential pole of the conductor is realized, and the crimping pipes is filled with the conductive material, so that the sections of the conductor can be in good contact, and the test current can smoothly pass through. It can be ensured that an accurate voltage value is measured at the potential pole of the conductor, and uncertainty of conductor resistance measurement caused by high welding temperature is avoided.

The invention discloses a direct current voltmeter and a method for measuring voltage by using the same, and relates to the technical field of electric quantity measuring instruments. The direct current voltmeter comprises an MCU (micro controller unit) as a main controller, and further comprises a program-controlled voltage source module and a current detection module which are in signal transmission with the MCU respectively, wherein the MCU controls the program-controlled voltage source module to output a varying voltage signal according to a signal transmitted from the current detection module; the voltage signal is gradually enhanced, and during voltage measurement, the internal resistance of the direct current voltmeter can be equivalent to infinity. The direct current voltmeter solves the technical problem that the conventional electric quantity measuring instrument cannot measure current and voltage accurately in the prior art; during the voltage measurement, the direct current voltmeter does not affect a to-be-measured circuit and can accurately measure the voltage of the to-be-measured circuit.

A spectroscopic measurement device includes a light receiving element that receives light and outputs a light receiving signal, a variable amplification circuit that amplifies the light receiving signal which is input, and a dark voltage correction unit that calculates a correction coefficient that is a rate of change of a dark voltage value with respect to gains, based on an output value of the variable amplification circuit with each value of two or more gains which are equal to or greater than a predetermined value in an environment where no light is incident on the light receiving element.

The invention discloses a voltage source circuit based on an operational amplifier bootstrap and feedback circuit, including a digital-to-analog conversion excitation source, an operational amplifier bootstrap and feedback topology network circuit, a push-pull output topology network circuit; a digital-to-analog conversion excitation source, It is used to provide a control circuit for the operational amplifier bootstrap and feedback topology network circuit, making the voltage source circuit digitally controllable; at the same time, the operational amplifier bootstrap and feedback topology network circuit realizes negative voltage by collecting the output node voltage of the push-pull output topology network circuit. Feedback ensures that the push-pull output topology network circuit outputs a constant voltage value; the operational amplifier bootstrap and feedback topology network circuit adjusts the voltage rail through bootstrap to achieve a wide range of voltage output, and through the push-pull The output topology network circuit realizes the voltage output above 100V and the current output above 1A. The invention realizes a wide range of voltage output and relatively large current output, significantly improves the load capacity of the voltage source circuit, and on this basis, takes into account the high precision of the voltage source output.

The invention discloses an overpressure protection device for a non-invasive sphygmomanometer and a threshold setting method of the overpressure protection device for the non-invasive sphygmomanometer. The overpressure protection device comprises a control device, a rectifier device, a comparator and a pressure sensor, wherein the control device is used for sending different PWM (Pulse Width Modulation) signals to the rectifier device; the rectifier device is used for rectifying the PWM signals and sending a rectified direct-current signal to the comparator; the comparator is used for comparing the direct-current signal with an output signal of the pressure sensor; and when a value of the output signal of the pressure sensor is not less than that of the direct-current signal, the comparator sends a control signal to the control device. Within a certain time if the control device does not receive the control signal, frequencies and duty ratios of the PWM signals are changed and the PEM signals are output, and if the control device receives the control signals, the frequencies and the duty ratios of the PWM signals are stored.

Disclosed is a polyphase type voltage conversion system. The polyphase type voltage conversion system comprises an input power supply, multiple voltage conversion units, a pulse-width modulation controller and multiple voltage detection units. The pulse-width modulation controller is used for outputting multiple pulse-width modulation signals with different phases; each voltage conversion unit comprises a diverter switch and an inductor; each voltage detection unit comprises a sampling switch which synchronizes switching with the diverter switch, and a voltage detector electrically connected with the pulse-width modulation controller; each voltage detector is electrically connected with one corresponding inductor through the sampling switch for detecting the voltage value of the corresponding inductor and outputting the voltage value to the pulse-width modulation controller; and the pulse-width modulation controller is also used for calculating an average value of received voltage values, comparing each voltage value respectively with the voltage average value, and correspondingly adjusting the duty ratio of a pulse-width modulation signal outputted to a corresponding voltage conversion unit according to a comparison result.

The invention discloses a temperature drift reducing device, which is characterized by comprising a computer, a singlechip, a regulable potentiometer, an operational amplifier circuit and a four-channel analogue-to-digital (A / D) converter, wherein the computer controls the transmitting and receiving of data and is bidirectionally connected with the singlechip; data communication between the computer and the singlechip adopts an RS232 protocol; the singlechip is in input connection with the regulable potentiometer and is bidirectionally connected with the four-channel analogue-to-digital (A / D)converter; the regulable potentiometer is in monodirectional input connection with the operational amplifier circuit; and the operational amplifier circuit is respectively in input connection with the four-channel analogue-to-digital (A / D) converter and an infrared focal plane array.