22 results about "Voltage polarity" patented technology

A display driving circuit and a display driving method are provided. The display driving circuit includes a controller, a common voltage supply circuit, and a border voltage supply circuit. The controller generates a plurality of border voltage control signals and a plurality of common voltage control signals. The common voltage supply circuit outputs a common voltage to the display panel according to the plurality of common voltage control signals. The border voltage supply circuit outputs a border voltage to the display panel according to the plurality of border voltage control signals. When a voltage polarity of the common voltage is reversed, the common voltage supply circuit performs charge sharing by a common ground voltage.

A dispensing apparatus includes a stage on which a substrate is seated, a dispensing head positioned above the stage, including a head electrode to which a first voltage is applied to electrically charge a resin, and configured to discharge the charged resin through a nozzle onto the substrate in the form of dots, and a resin control electrode positioned between the dispensing head and the stage, where a second voltage having a same polarity as the first voltage is applied to the resin control electrode to control a position of the resin dot discharged from the nozzle.

The application provides an alternating voltage electric spray thruster working state recognition method, device and equipment, relates to the electric spray thruster technical field, and comprises the following steps: in the case where the voltage polarity of an alternating voltage electric spray thruster reverses, collecting a corresponding emission current sequence of the alternating voltage electric spray thruster; extracting a target characteristic quantity corresponding to the emission current sequence, the target characteristic quantity being used for describing the characteristics in the process in which the emission current sequence recovers from a disturbance state to a stable state after the voltage polarity reversal event occurs; and identifying the working state of the alternating voltage electric spray thruster according to the target characteristic quantity. The application can only use the emission current data of the thruster, extract a limited number of simple features from the current waveform under the alternating voltage condition, and realize online identification of states such as 'normal working / serious over spray / high and low flow / launching attenuation'.

To achieve stable temperature control of a piezoelectric vibrator in a sensing device that detects a substance to be detected, under relatively low temperature conditions. [Solution] The sensing device of the present invention comprises a piezoelectric vibrator, an oscillation circuit for causing the piezoelectric vibrator to oscillate, a Peltier element for changing the temperature of the piezoelectric vibrator, a case for housing the piezoelectric vibrator, the oscillation circuit, and the Peltier element, a temperature sensor provided attached to the case for detecting the ambient temperature, and a selection unit for selecting one of the following: a first state in which the polarity of the voltage applied to the Peltier element can be changed so that heating and cooling of the piezoelectric vibrator are possible, and a second state in which the polarity of the voltage applied to the Peltier element is fixed so that only heating of the piezoelectric vibrator is possible.

The application discloses a control method and system for realizing totem pole PFC high-frequency bridge arm staggered parallel and full-range soft switching, and mainly solves the problem that the prior art cannot simultaneously realize stable staggered parallel of totem pole PFC and active tube soft switching of master and slave phases. The implementation scheme comprises the following steps: collecting input voltage, output voltage, inductance current of master and slave phases and circuit parameters of a bridgeless totem pole PFC parallel circuit; calculating PI voltage loop output power and input voltage polarity signal; calculating active tube conduction time parameter, active tube turn-off time parameter, synchronous tube conduction time parameter and synchronous tube turn-off time parameter for realizing ZVS; calculating compensated slave phase active tube turn-off time parameter and synchronous tube conduction time parameter; and controlling active tube and synchronous tube of master and slave phases of the totem pole PFC based on the time parameters. The application can realize soft switching of all high-frequency active tubes while realizing stable staggered parallel of the totem pole PFC high-frequency bridge arm, and can be used for various high-power power electronic circuits.

This application discloses a static electricity neutralization method and apparatus based on PECVD, belonging to the field of semiconductor thin film deposition technology. It includes: applying a first radio frequency (RF) to a reaction chamber to ionize a continuously introduced reactive gas into the chamber, forming plasma which is then deposited onto the wafer surface; after stopping the introduction of the reactive gas and the application of the first RF, applying a second RF in the chamber, wherein the power of the second RF is lower than that of the first RF, and the voltage polarity of the second RF is opposite to that of the first RF; moving a heater base on which the wafer is placed downwards to increase the gap between the wafer and the heater base, thereby facilitating the neutralization of static electricity between the wafer and the heater base by the second RF; and after stopping the application of the second RF, introducing a purge gas into the chamber to clean the wafer surface. This application neutralizes static electricity through low-power plasma discharge, avoiding the problems of wafer breakage and adhesion caused by electrostatic forces between the wafer and the heater base.

The application discloses a control method and system for realizing bridgeless totem-pole PFC full-range ZVS and frequency limitation. The implementation scheme is as follows: input voltage, output voltage and inductor current of the bridgeless totem-pole PFC circuit are collected to obtain input voltage polarity signal and PI voltage loop output power; the additional reverse conduction time of the synchronous tube for realizing ZVS is calculated; the original active tube conduction time of the additional reverse conduction time of the synchronous tube without the synchronous tube and the additional reverse conduction time of the synchronous tube for realizing frequency limitation are calculated; the additional reverse conduction time of the synchronous tube and the active tube conduction time for simultaneously realizing ZVS and frequency limitation are calculated; the dead time is self-defined, and the active tube and the synchronous tube of the bridgeless totem-pole PFC circuit are controlled to act based on the time, the input voltage polarity signal, the additional reverse conduction time of the synchronous tube and the active tube conduction time for simultaneously realizing ZVS and frequency limitation and the inductor current zero-crossing signal. The application can realize high-frequency switch tube full-range ZVS and limit the frequency of the high-frequency tube switch, and can be used in various high-power power electronic circuits.

This application relates to an operational amplifier circuit, an op-amp chip, and an electronic device. At the first input differential pair of the first differential input circuit, a first auxiliary differential pair of the same type but with a proportionally reduced switching transistor size is connected in parallel. The gates of the first auxiliary differential pair are connected to a first differential voltage adjustment circuit, which is configured to adjust the output voltage. When voltage offset occurs in the operational amplifier circuit, the calibration voltage between the output and the gates of the first auxiliary differential pair is adjusted to create a gate-source voltage difference, causing current imbalance between the first auxiliary differential pairs. An equivalent input offset compensation voltage is introduced into the input stage through this imbalance current. This input offset compensation voltage has the opposite polarity and direction to the offset voltage, thereby canceling out the offset voltage and achieving offset calibration. This approach achieves high op-amp offset voltage calibration accuracy while maintaining hardware cost.

This invention relates to a DA conversion circuit for a fiber optic gyroscope with zero-adjustment function, belonging to the field of fiber optic gyroscope technology. The circuit first uses a DA conversion unit to convert the digital angular rate to an analog voltage, then a bipolar conversion module to convert the voltage polarity, a gain configuration module to adjust the voltage gain, a compensation factor module to generate a compensation factor, and a zero-adjustment module to achieve circuit zeroing. Finally, a filtering and adjustment module performs bandwidth limiting, noise filtering, and output range adjustment, ultimately outputting an analog voltage signal with the required angular rate. This invention improves the circuit's output accuracy and stability, enabling precise, real-time conversion of the fiber optic gyroscope's digital angular rate to an analog signal.

This application provides a voltage discharge circuit and display driver chip suitable for positive and negative voltage output VCOM. The voltage discharge circuit includes: a discharge unit connected between the VCOM output terminal and a reference ground, used to discharge the positive or negative voltage of the VCOM output terminal to the reference ground in discharge mode; and a control unit connected to the control terminal of the discharge unit, used to adaptively generate a gate control voltage according to the voltage polarity of the VCOM output terminal in discharge mode to control the discharge unit to conduct. The discharge unit is in a turned-off state during normal operation and conducts in response to the gate control voltage in discharge mode, achieving adaptive discharge of positive or negative voltage. The voltage discharge circuit of this application is low in cost, can quickly and safely discharge output voltage, protect device safety, and can be widely used in various liquid crystal display driver chips, possessing high industrial practical value.

This invention discloses a method, apparatus, device, and medium for identifying the voltage polarity of a hard-plate circuit, belonging to the field of power grid hard-plate status detection technology. The method includes: determining the current operating environment type after the signal acquisition part is installed; if the current operating environment of the signal acquisition part meets a first operating environment condition, analyzing whether the voltage value meets a first comparison condition, and determining the voltage polarity based on the result; if the current operating environment of the signal acquisition part meets a second operating environment condition, analyzing whether the voltage value meets a second comparison condition, and determining the voltage polarity based on the result; if the current operating environment of the signal acquisition part meets a third operating environment condition, analyzing the real-time waveform of the voltage to obtain corresponding signal points in the real-time waveform, and analyzing the signal points to determine the voltage polarity. This invention avoids the risk of violating safety regulations by selecting a suitable identification method based on the current operating environment type of the signal acquisition part, accurately identifying the voltage polarity of the current voltage.

This invention discloses a hybrid DC circuit breaker based on self-charging oscillation-assisted commutation. The main current-carrying branch carries current bidirectionally during normal operation and interrupts fault current in case of a fault, achieving arc-free disconnection of the mechanical switch. One end of the current injection branch is connected to the side of the power electronic device furthest from the mechanical switch, and the other end is connected to the side of the mechanical switch furthest from the power electronic device to generate an oscillating current that cancels out the fault current, generates zero-current-point assisted commutation of the mechanical switch, and establishes the trigger voltage for the energy-consuming branch. The current injection branch includes a series-connected anti-parallel thyristor combination and a capacitor C. p and inductor L p One end of the commutation branch is connected to the side of the power electronic device away from the mechanical switch, and the other end is connected to the side of the mechanical switch away from the power electronic device. This provides a path for fault current transfer and oscillation to reverse the polarity of the capacitor voltage. The commutation branch includes several power electronic module structural units SM connected in series, which have bidirectional conduction and turn-off capabilities.

This invention discloses a reverse polarity protection circuit, an integrated circuit, and an electronic circuit including the integrated circuit. The integrated circuit includes an input terminal for receiving an input voltage, an output terminal for providing an output voltage, a reference terminal, a power ground terminal, a power transistor, a main control circuit, a variable resistor circuit, and a drive circuit. The power transistor has a current conduction path coupled between the input terminal and the output terminal and a control terminal. The main control circuit provides a control signal based on the potential of the reference terminal to the control terminal of the power transistor. The variable resistor circuit is coupled between the reference terminal and the power ground, switching between an on state and an off state based on a drive voltage applied to a control terminal of the variable resistor circuit. The drive circuit adjusts the drive voltage based on the voltage polarity of the input voltage or the output voltage. Using embodiments of this invention, the reliability of the protection circuit is ensured while maintaining low conduction losses.

This invention discloses a sensorless limit control circuit for an electric linear actuator, an electric linear actuator, and a control method. The control circuit includes: a rectifier bridge, whose input terminals are connected only to an external first power line and a second power line; a voltage polarity identification circuit for detecting the external voltage polarity and outputting a digital signal; a motor driver chip with built-in current detection and a fault indication output pin; and a microcontroller connected to the voltage polarity identification circuit, the control input terminal of the motor driver chip, and the fault indication output pin. The microcontroller is configured to: control motor operation based on the polarity identification result; monitor the status of the fault indication pin in real time; determine if the motor is stalled or the linear actuator has reached its stroke end point when a valid signal is detected; immediately shut off the H-bridge output and lock the current direction, allowing only reverse rotation. This invention also provides an electric linear actuator incorporating this control circuit and a corresponding control method. This invention completely eliminates physical limit devices such as limit switches and Hall sensors, requiring only two external power lines, compatible with traditional two-wire systems, and achieving low-cost, high-reliability contactless limit control.

The application relates to a kind of vehicle door emergency control method and system based on thermoelectric conversion, and the method comprises: using the flexible thermoelectric material array laid between the floor and battery pack in vehicle, real-time acquisition floor temperature change, and based on Seebeck effect, floor heat is converted into thermoelectric power difference;Based on the amplitude of thermoelectric power difference, in combination with the output voltage polarity and temperature space distribution characteristics of flexible thermoelectric material array, the overheating abnormal information of battery pack is obtained;In the case of vehicle electric control system power failure, according to the overheating abnormal information, the vehicle door is controlled to execute self-driven unlocking mode through hierarchical response, and the self-driven unlocking mode comprises: electromagnetic self-driven mode driven by thermoelectric power difference, and thermal mechanical drive mode generated by deformation tension of floor heat conduction shape memory alloy element.The application can automatically and reliably open the vehicle door lock in the extreme case of electronic door lock failure.

The application discloses a fault detection method and related device of a flexible direct current power transmission system. The method adopts a voltage gradient algorithm to detect whether the flexible direct current power transmission system has a fault. When the system has a fault, a fault type is distinguished based on a ground model voltage polarity through a sampled voltage signal, a high-frequency impedance difference ratio of a rectification side and an inversion side in the flexible direct current power transmission system is determined based on the voltage signal and a sampled current signal, a fault direction is distinguished based on the high-frequency impedance difference ratio, and finally a fault detection result is determined according to the fault type and the fault direction. It can be seen that the fault polarity is selected based on the ground model voltage polarity, and the intra-zone and extra-zone faults are accurately distinguished through the high-frequency impedance difference ratio, so that the reliability of the fault detection of the flexible direct current power transmission system is improved.

The application provides a 10KV power distribution network fault automatic diagnosis positioning method, constructs a confidence evaluation model by collecting current direction and voltage polarity data, and carries out cross verification combined with a historical fault feature database to obtain a preliminary and adjusted confidence sequence; in view of the interference monitoring point, the weight of the interference monitoring point is reduced, a weighted polarity sequence is generated, and mode matching is carried out to determine a preliminary fault section; a multi-dimensional verification matrix is constructed by fusing the power distribution automation switch action and the user repair geographic position, the spatial deviation is quantified, and when the threshold is exceeded, deep analysis is started, the deviation sequence is corrected by means of the consistency filtering of the power distribution network topological connection relationship and the business standby path, finally, the information fusion technology is adopted to integrate the multi-source results to output the accurate fault position, and the positioning result is fed back to update the fault feature database and the confidence model parameters, adaptive optimization diagnosis is realized, and the diagnosis precision is improved.

The present disclosure provides a system for disinfecting fluid comprising a cylindrical outer electrode defining an internal cavity and a center electrode positioned within the cavity. The center electrode extends along the longitudinal axis and comprises an inner wire and outer shell surrounding the wire. An inlet at the first end allows fluid to enter the cavity. An outlet at the second end allows fluid to exit. A voltage source applies voltage across the electrodes. The outer electrode comprises copper and inner wire comprises stainless steel. The outer shell comprises copper electrodeposited from the outer electrode. First voltage polarity results in electrodeposition from outer electrode to outer shell, while opposite polarity results in ionization of the outer shell metal for disinfection.

The application discloses a DC power spring system for a DC micro-grid, comprising a key load, a non-key load, a single cell and a high-gain bidirectional DC / DC converter; a low-voltage port of the high-gain bidirectional DC / DC converter is connected with the single cell, a high-voltage port of the high-gain bidirectional DC / DC converter is connected in series with the key load and then is connected in parallel with the non-key load, and the high-gain bidirectional DC / DC converter controls the voltage across the key load by adjusting the output voltage of the high-gain bidirectional DC / DC converter. The application can realize the inversion of the polarity of the output voltage without setting an inverter circuit additionally; the application is directly connected in series with the key load, and the adjusting object is the key load itself, so when the bus voltage fluctuates, the fault response speed only depends on the response speed of the high-gain bidirectional DC / DC converter and is not affected by the non-key load, so that the application has a fast response speed after the bus voltage of the DC system fluctuates.

This application discloses a lidar and wind measurement system. The lidar includes a voltage regulator, a charge pump, a flying capacitor, an operational amplifier, a first filter circuit, a second filter circuit, a third filter circuit, and a fourth filter circuit. The voltage regulator converts the output voltage of the power supply into a positive voltage, which, after being filtered by the first filter circuit, powers the positive terminals of the charge pump and the operational amplifier. The charge pump and the flying capacitor reverse the polarity of the positive voltage to generate a negative voltage, which, after being filtered by the second filter circuit, powers the negative terminal of the operational amplifier, providing a symmetrical bipolar power supply rail for the operational amplifier. The operational amplifier can accurately amplify the first laser echo signal. At the same time, the third and fourth filter circuits decouple and filter the positive and negative terminals of the operational amplifier's power supply, respectively, to achieve full-band noise suppression, reduce the interference of power supply noise on signal amplification, improve the signal-to-noise ratio, enhance the detection accuracy of the lidar, and extend the maximum detection range of the lidar.

The application discloses a kind of strong PUF circuits for Internet of Things security protection, including two TMR sensor arrays, two instrument amplifiers, two switched capacitor integrators and a comparator, TMR sensor array includes multiple TMR sensor units, the number of TMR sensor units in two TMR sensor arrays is controlled to be turned on by excitation signal, so that it generates differential voltage signal, two instrument amplifiers differentially amplify two differential voltage signals respectively, generate amplified voltage signal, two switched capacitor integrators are sampled and accumulated to amplified voltage signal respectively, and sample voltage signal is output to comparator, comparator carries out voltage polarity decision to two sample voltage signals, and obtains PUF response;The advantages are that it has higher uniqueness and randomness, and also has higher stability, lower bit error rate and higher excitation-response pair number, can meet the demand of high reliability large-scale security authentication system.