235 results about "Voltage sensing" patented technology

The invention discloses a high-integration intelligent ignition head device and an automobile safety communication power supply system thereof. The device comprises an input unit, a power management module, a communication module, a communication judgment module, an MCU, a voltage sensing module, a current sensing module, an ignition control module, an ignition element and a substrate, and an environment self-adaption unit, a dual-mode wireless energy supply unit and an optical fiber diagnosis channel can be additionally arranged. The system adopts the device, communicates with a central control unit through a redundant optical fiber bus and a double-wire bus, and further comprises the central control unit, a dynamic topology reconstruction unit and a pre-ignition energy distribution unit. Through digital signal control, multi-dimensional sensing module integration and a double-wire bus topological structure, ignition threshold multi-stage protection, state real-time monitoring and feedback, multi-ignition-head parallel independent control and miniaturized function integration are achieved, and the reliability, the intelligent degree and the driving efficiency of an automobile safety system are improved.

Disclosed is a system for zero voltage switching in a power converter with a first half-bridge and a second half-bridge. The first half-bridge has a first set of transistors and output inductor. The second half-bridge has a second set of transistors and auxiliary inductor. A current sensing means measures, at switching cycle scale, average and maximum current values of output inductor and average, minimum and maximum current values of auxiliary inductor. A voltage sensing means measures input and output voltages of first and second half-bridge. A controller is configured to compute dead times of pulse width modulation control signal of second half-bridge, generate pulse width modulation control signal of second half-bridge and to adapt dead times of first half-bridge.

The invention relates to the technical field of overvoltage monitoring, in particular to a wide-frequency-domain overvoltage online monitoring system and method for electric power high-voltage equipment. Comprising an electric field sensor array, an acquisition unit, a calculation unit and an output unit, the electric field sensor array comprises a plurality of sensors which are radially distributed on the same circumferential plane and have different measuring ranges and sensitivities, and sensors which are axially distributed; the electric field sensor comprises a sensing unit and a fiber bragg grating temperature measuring unit; the fiber bragg grating temperature measuring unit is suitable for measuring the temperature of the sensing unit; the acquisition unit is suitable for synchronously acquiring the emergent light intensity of the sensing unit and the temperature data of the fiber grating temperature measurement unit. The multi-range sensors distributed in the radial direction achieve wide-range and high-sensitivity voltage sensing through differential design, the intrusion direction of overvoltage can be determined through cooperation of the axial sensors and the radial sensors, and the problem that the range and sensitivity of a single electric field sensor are mutually restricted is solved.

The application provides a pressure signal fitting method and device, the method comprises: applying pressure to each sensing point in a pressure sensor, measuring the relationship between pressure and resistance of each sensing point, and integrating to obtain the pressure-resistance relationship; the pressure-resistance relationship is corrected through a numerical filtering algorithm, and the corrected pressure-resistance relationship is fitted to obtain an optimized pressure-resistance relationship; the switching of the voltage sensing circuit sensing points is carried out through an integrated analog electronic switch, the voltage of the stressed multiple array sensing points is measured; the resistance of the multiple array sensing points is calculated according to the measured voltage combined with the acquisition circuit; and the pressure of the multiple array sensing points is calculated through the optimized pressure-resistance relationship; based on the area of the stress area and the non-stress area of the multiple array sensing points, the actual stress of the multiple array sensing points is calculated through the relationship between force and pressure.

A power conversion system includes: a rectifier for rectifying an AC input voltage to generate a rectified voltage; a power stage circuit coupled to the rectifier; a sensing circuit coupled between a multiplex pin and either the AC input voltage or the rectified voltage and configured to generate a multiplexed sensing signal; and a control circuit for performing operations for over-temperature protection and brown-out protection during respective over-temperature and brown-out protection periods based on the status of the multiplexed sensing signal. The control circuit includes: the multiplex pin; and a current source and a bias switch, serially coupled to the multiplex pin. During the over-temperature protection period, the bias switch is conductive to provide a bias current to the sensing circuit to generate a temperature sensing signal. Outside the over-temperature protection period, the bias switch is non-conductive to stop providing the bias current, thereby generating an input voltage sensing signal.

The invention discloses an all-digital PVT sensor based on a ring oscillator, and relates to the field of PVT sensors, the all-digital PVT sensor comprises a process sensing circuit, a voltage sensing circuit and a temperature sensing circuit, the process sensing circuit comprises a process detection ring oscillator, the voltage sensing circuit comprises a voltage detection ring oscillator, and the temperature sensing circuit comprises a temperature detection ring oscillator. The temperature sensing circuit comprises a temperature sensitive ring oscillator; under the control of an enable signal, the process detection ring oscillator, the voltage detection ring oscillator and the temperature-sensitive ring oscillator start oscillation, and the process corner, the temperature and the power supply voltage of the detected chip are determined based on the oscillation frequencies of the process detection ring oscillator, the voltage detection ring oscillator and the temperature-sensitive ring oscillator. The PVT sensor is completely realized based on a digital circuit, an additional analog module does not need to be introduced, the area overhead is greatly reduced, and the PVT sensor has remarkable area advantage and structural simplicity while the high-precision detection capability is maintained.

The present disclosure relates to the technical field of display, and provides an ambient light detection circuit and method, and a display device. The ambient light detection circuit is used for ambient light detection of a display panel. The detection circuit comprises: a plurality of sensing modules, which are used for collecting ambient light and outputting current sensing signals based on the ambient light; a plurality of current conversion modules, which are arranged correspondingly to the plurality of sensing modules, and are used for converting the current sensing signals output by the sensing modules connected thereto into voltage sensing signals; a plurality of storage modules, which are arranged correspondingly to the plurality of current conversion modules, and are used for storing the voltage sensing signals output by the current conversion modules connected thereto in response to a sampling control signal; and a control module, which is connected to the storage modules respectively, and is used for synchronously outputting the sampling control signal to each of the storage modules.

According to certain embodiments, a switch cover comprises a panel with a hole, wherein the hole is configured to receive a rocker, wherein the rocker selectively controls an electrical connection between a first line and a second line; a voltage sensor disposed on the panel and configured to induce a current from an electrical field generated by electrical power transmitted over the electrical connection between the first line and the second line; and an antenna disposed on the panel and configured to transmit a radio signal in response to induction of the current in the voltage sensor.

A thermostat with voltage and current sensing capability is coupled directly to an HVAC unit and provides low latency failure detection and control using an on-board CPU. The thermostat can be configured to detect failure modes using current and voltage sensing and to make autonomous decisions to control the HVAC in response to such measurements.

A system (12) for a vehicle, an assembly (10), and a method for detecting a connection state of a switching device (62) of a charging circuit (56) are provided. The system (12) comprises at least one stator coil (30) of an electric machine (18), an inverter (16), and a charging circuit (56). The inverter (16) is configured to be coupled to a battery (14) of the vehicle. The charging circuit (56) is configured to be coupled to a charging device external to the vehicle. The charging circuit (56) is further configured for adapting a charging program of the battery (14) of the vehicle. The charging circuit (56) comprises at least a capacitor (64) and the switching device (62). The switching device (62) is arranged between the capacitor (64) and the stator coil (30). A single voltage sensing element (66) is arranged between the switching device (62) of the charging circuit (56) and a star point (60) of the electric machine (18). A control circuit (36) is configured to detect the connection state of the switching device (62) of the charging circuit (56) based on a voltage magnitude measured by the voltage sensing element (66).

A current sensing device is provided, including: a laminate having a plurality of insulating layers laminated therein; a current sensing element provided in an inner layer of the laminate; a current wire configured to flow current to the current sensing element, the current wire being provided above an interlayer insulating layer with respect to the current sensing element; a plurality of current vias configured to connect the current sensing element and the current wire in such a manner as to penetrate the interlayer insulating layer; and a voltage sensing via configured to obtain a voltage drop in the current sensing element, the voltage sensing via being electrically connected to the current sensing element.

A detector circuit includes a parametric resonator circuit comprising a first varactor and a second varactor disposed in a loop. The parametric resonator has a conductor disposed between the first varactor and the second varactor. The detector circuit further includes a voltage sensing resonator circuit aligned on the parametric resonator circuit so that at least a first portion of the resonator circuit is disposed in the loop and a second portion is disposed outside the loop in an axial view.

The invention relates to a voltage sensing device with a micro-electro-mechanical element. The voltage sensing device comprises a micro-electro-mechanical sensing element, a transimpedance amplifying circuit and a differentiating circuit, the micro-electro-mechanical sensing element is used for sensing an input voltage to generate a sensing current. The transimpedance amplification circuit is connected to the output end of the micro-electro-mechanical sensing element to receive the sensing current and convert the sensing current into an amplification voltage. The differentiating circuit is connected to the transimpedance amplifying circuit and used for receiving the amplified voltage and differentiating the amplified voltage to generate a differential signal, and the differential signal indicates whether the input voltage has a sudden change state or not and indicates the time point when the input voltage suddenly changes.

The application discloses a four-electrode voltammetry oil product acid-base value detection circuit design method, and belongs to the technical field of electrochemical detection. The method comprises the following steps: designing a four-electrode system, a controllable current source, a voltage sensing unit and a regulation circuit to form a complete oil product acid-base value detection circuit. The four-electrode system comprises an auxiliary electrode, a working electrode and two reference electrodes; the controllable current source outputs an excitation current and injects the excitation current into a detection solution through the auxiliary electrode and the working electrode; the voltage sensing unit collects a response potential difference of the detection solution through the two reference electrodes; the regulation circuit adjusts the output excitation current of the controllable current source in a current scanning or voltage scanning mode and synchronously collects the response potential difference, constructs a voltammetry curve between the excitation current and the response potential difference, and calculates a reaction peak area parameter and a corresponding acid-base value of the measured oil product. The application can overcome the problem caused by the working electrode potential drift of the traditional three-electrode type oil product acid-base value detection circuit, and thus stable and accurate detection results are obtained.

A battery pack comprises a storage battery, several switches, a voltage sensing circuit, and a diagnostic circuit. The storage battery has several battery cells connected in series. The switches correspond to the respective battery cells and are each located in a first parallel path of a corresponding battery cell. The voltage sensing circuit is configured to detect the voltages across the switches as multiple cell voltages corresponding to the respective battery cells. The diagnostic circuit is configured to activate one or more of the switches within a predetermined time period and to perform a diagnostic process based on a voltage sensing circuit reading before and after the predetermined time period.

The present disclosure relates to methods and systems for determining the torque applied to a long shaft of a motor. A three-phase motor has a shaft, a main rotor-stator assembly and two sense stator-rotor assemblies. A control circuit applies three phase power to cables connected to the assemblies. At a measurement circuit, time-varying voltages on the cables are measured, which include the voltage induced due to the two sense rotor-stator assemblies. The sense assemblies differ from the main motor assembly to induce additional, small voltages into the electrical circuit. A transformation is applied to these signals to determine the main frequencies, amplitudes, and phases of the different signals. Using the phase differences among the voltages induced by the first and second sense rotor-stator assemblies and the main rotor-stator assembly, the torque on the shaft may be determined.

The motor drive device comprises: a pre-charge resistor that suppresses an inrush current during the pre-charging of a capacitor provided at a DC intermediate stage on the DC output side of an inverter; a pre-charge switch connected in parallel to the pre-charge resistor; a voltage sensing unit that detects the value of an input voltage; an input switching unit that selectively switches the voltage to be input to the voltage sensing unit between a first voltage, which is a voltage of the pre-charge resistor, and a second voltage, which is a voltage other than the voltage of the pre-charge resistor; and a fault detection unit that determines, based on the voltage value detected by the voltage sensing unit, whether or not there is a fault in the pre-charge switch.

The invention provides a direct current motor driving system integrating remote measurement and safety control, and relates to the technical field of motor driving and control, and the system comprises a PWM signal conditioning circuit which receives and conditions a PWM signal and is originally compatible with Pixhawk; the bidirectional polarity control circuit realizes positive and negative rotation of the motor through an optical isolation solid-state relay; the H-bridge driving circuit modulates the current of the motor; the current and voltage sensing circuit is used for generating current and voltage analog signals; the step-down conversion circuit supplies power to the flight controller; the logic level conversion interface is used for realizing 3.3 V / 5V level conversion; the telemetering output circuit outputs the analog signal to a flight controller ADC and transmits the analog signal to a ground station through MAVLink; and the fault protection circuit is used for triggering protection during overcurrent, overvoltage or undervoltage. Through the integrated design, the problems that a traditional driving module is poor in compatibility and lacks telemetering and protection are solved, and plug-and-play, state sensing, safe and reliable integrated driving is achieved.

A water-quality detection apparatus includes a detection chamber device, a pump module, a light source, a light sensor and a controller. The pump module is configured to transport a to-be-tested liquid and a reagent to a detection chamber of the detection chamber device. The light source emits detection light to the detection chamber. The light sensor senses the detection light traveling through the detection chamber and generates a detection voltage. The controller performs the following procedures: a voltage sensing procedure, a dilution determination procedure, a dilution procedure and a concentration acquisition procedure. The dilution determination procedure may calculate a voltage ratio between the detection voltage value and a basic-voltage value. When the voltage ratio is greater than a critical value, the concentration acquisition procedure is performed. When the voltage ratio is not greater than the critical value, the dilution procedure is performed.

The described embodiments include a protection circuit comprising a voltage attenuation circuit with an input coupled to a switch terminal. A filter circuit has a filter input coupled to the output of the attenuation element. A first transistor has a first current terminal coupled to a power supply terminal and a first control terminal coupled to the filter output. A second transistor, matched to the first transistor, has a third current terminal coupled to the first current terminal, a second control terminal coupled to the first control terminal, and a fourth current terminal coupled to a first voltage sensing terminal. A buffer circuit has a buffer input coupled to the attenuation output.A S / H circuit has a sampling input coupled to the buffer output and a sampling output that provides a minimum ringing voltage of a signal from the switch terminal.

A lamp control method, a chip, a non-transitory computer-readable storage medium, a computer program, and an electronic device are provided. The lamp control method comprises acquiring a present working state of a lamp; determining a control priority of a voltage sensing function block and a control priority of a timing function block based on the present working state of the lamp to obtain a priority result; controlling the lamp to work based on the priority result. When the lamp is in the operating state, the control priority of the timing function block is configured to be higher than the control priority of the voltage sensing function block, such that the lamp is controlled to work based on the preset timing strategy, avoiding interference from other external light sources.

A method is performed in a welding or cutting system including a power supply configured to deliver current pulses through a weld circuit to a contact tip extending from a welding torch to create an arc on a workpiece. The method includes: while the contact tip is shorted to the workpiece to set an arc voltage equal to zero: sampling a current pulse to produce current values; and at a voltage sense point, on the power supply or the weld circuit, that is spaced-apart from the welding torch, sampling a voltage pulse associated with the current pulse to produce voltage values that differ from the arc voltage due to an electrical circuit parameter of the weld circuit; and computing a value of the electrical circuit parameter based on the current values, the voltage values, and the arc voltage equal to zero.

Certain aspects of the present disclosure relate to techniques and apparatus for adaptive drive control of switching regulators. An example power supply circuit generally includes a power supply rail and a switching regulator power stage. The switching regulator power stage includes a power transistor and an input coupled to the power supply rail. The power supply circuit also includes a transient voltage sensing circuit having an input coupled to the power supply rail and an input voltage sensing circuit having an input coupled to the power supply rail. The power supply circuit further includes control logic having an output coupled to a gate of the power transistor, a first input coupled to an output of the transient voltage sensing circuit, and a second input coupled to an output of the input voltage sensing circuit.

An electricity meter is disclosed. The electricity meter comprises at least one current sensing device configured to sense an electrical current at a first terminal of the meter. The electricity meter comprises at least one voltage sensing device. The electricity meter comprises an actuatable device coupled to the voltage sensing device and selectively configurable between a first state and a second state. In the first state the at least one voltage sensing device is configured to sense a first voltage between the first terminal and a second terminal of the meter. In the second state the at least one voltage sensing device is configured to sense a second voltage between the first terminal and a test point of the meter.

This application relates to a primary and secondary integrated multifunctional instrument-type current transformer, comprising a body and an intelligent module. The body includes a housing and a first coil. The housing has a receiving cavity and a central opening. The receiving cavity is located on the outer periphery of the central opening, and the first coil is located inside the receiving cavity. The central opening is for copper busbars to pass through, and multiple central openings are provided. The intelligent module includes a circuit board, which includes a signal processing circuit and a voltage sensing unit. The signal processing circuit is electrically connected to the coil to acquire current parameters, and the voltage sensing unit is used to acquire voltage parameters. The body and intelligent module are integrated, requiring only one installation of the body. The copper busbars do not need to bend, reducing the amount of copper busbar material used and reducing manpower and material resources.

Non-contact AC voltage sensing systems, methods and circuits are described. An example comprises a conductive sense component for positioning, when in use, in non-contacting proximity to a conductor to capacitively couple with the conductor to generate an AC sensing signal at the conductive sense component, wherein the AC sensing signal is dependent on an AC voltage of the conductor. The system also comprises a comparator comprising: a first input coupled to the conductive sense component, a second input, and an output to output a first comparison signal indicative of which of a first potential at the first input and a second potential at the second input is higher. Either input of the comparator is biased by a variable reference voltage. The system comprises an analysis circuit coupled to the output of the comparator and configured to sense the AC voltage based on the variable reference voltage and the comparison signal.

An electrical circuit that emulates a battery, e.g., an EV battery, when being charged may comprise: terminals configured to connect to a battery charging device; and a regulator circuit including: a voltage sensing circuit for sensing the voltage at the terminals and providing a voltage proportional thereto; a comparator circuit responsive to the difference between the voltage sensing circuit and the reference voltage; a controllable load circuit connected to the terminals and including a controllable element responsive to the comparator circuit for causing a current to flow between the terminals; whereby the current flowing in the controllable load circuit is controlled to maintain the voltage between the terminals at a voltage that is proportional to the reference voltage.

A switching regulator includes: a phase number signal generator circuit which includes: a current sensing signal differentiator circuit for performing differentiation on a current sensing signal to generate a current differentiation signal; a current sense signal filter circuit for filtering the current sense signal to generate a filtered current signal according to the current differentiation signal; and a phase number decision circuit for deciding a phase number signal according to the filtered current signal; and an AQR signal generator circuit which includes: a voltage sensing signal differentiator circuit for performing differentiation on a voltage sensing signal to generate a voltage differentiation signal; and plural comparator circuits for comparing the voltage differentiation signal with plural AQR threshold signals to generate plural AQR comparison signals, so as to generate an AQR signal to control an operation signal generator circuit to perform an adaptive quick response procedure.

Disclosed is a system with regenerative cascaded H-bridge circuitry leveraging a hybrid control topology, an example of which is a variable frequency drive. Hybrid control allows for substantially cost and efficiency-improved implementation. With hybrid control, fault detection and gating control are split into those features managed at an regenerative power cell level (e.g., fundamental front-end control), those features managed at a central controller level (e.g., alternating-current over / under voltage detection), and those features that may be collaboratively managed by both the regenerative power cell and controller control (e.g., phase synchronization, direct-current bus over / under voltage detection, and power loss). Hybrid control uses current sensors at the input to the primary coil of a transformer in the system and voltage sensing at each regenerative power cell of the system. Voltage sensing at each regenerative power cell eliminates the need to calibrate the transformer during commissioning, while fewer current sensors improve implementation cost.

A detection circuit includes: a plurality of sensing modules, where a sensing module of the plurality of sensing modules is configured to collect ambient light and output a current sensing signal based on the ambient light; a plurality of current conversion modules, where a current conversion module of the plurality of current conversion modules is configured to convert a current sensing signal output by a sensing module connected to the current conversion module into a voltage sensing signal; a plurality of storage modules, where a storage module of the plurality of storage modules is configured to store a voltage sensing signal output by a current conversion module connected to the storage module in response to a sampling control signal; and a control module, where the control module is configured to output the sampling control signal synchronously to each storage module of the plurality of storage modules.