1236results about "Indicating presence of current/voltage" patented technology

A sensor product for electric field sensing. The sensor includes a substrate, at least one electrically conductive area on the surface of the substrate, an output, and at least one conductor between the at least one electrically conductive area and the output. Also a sensor product web.

A method and system for measuring electric current in a plurality (n) of conductors. According to the invention, the method comprises the following steps: an electric current transducer is place substantially opposite to each conductor (I, i=1, . . . , n); a decorrelation matrix ([G]), which is a function of the position of the transducers in relation to the conductors, is constructed; the current (I_mesi) in each conductor (i) is measured with the aid of electric current transducers and real currents (I_reeli) are deduced with the aid of the decorrelation matrix ([G]) and the measured currents (I_mesi).

A current sensor for measuring an electric current flowing through a conductor includes a ring shaped magnetic core, a bare semiconductor chip, and a case. The magnetic core has a gap and surrounds the conductor. The bare semiconductor chip has a front surface and a vertical Hall effect element formed on the front surface. The bare semiconductor chip is arranged in the gap of the magnetic core to detect a magnetic field generated by the electric current. The magnetic core and the bare semiconductor chip are accommodated in the case. A back surface of the bare semiconductor chip is fixed in the case in such a manner that the front surface of the bare semiconductor chip is parallel to a direction of the magnetic field.

A transmitter that is electrically connected to a circuit and an associated receiver is used to identify an element of that circuit in the presence of other circuits. This may be used in AC or DC systems that are powered or not to identify or trace circuit elements such as lines, junctions, switches, fuses, or breakers. One version that identifies the circuit breaker of the circuit connected to the transmitter in a powered AC distribution system.

A current sensor includes a sensing circuit for sensing current and supplying indications thereof. The current sensor also includes two or more output terminals coupled to the sensing circuit that alternately supply respective indications of the sensed current according to control signals supplied to the current sensor.

A hand tool includes an alarm circuit assembly mounted in an insulating sheath at a handle of an electrically conducting tool body of the hand tool for producing a visual alarm signal when the electrically conducting tool body of the hand tool touches an electrified body, and a light-transmitting member for reflecting and refracting light from the visual alarm to form a ring of light around a top end of the insulating sheath upon the presence of the visual alarm signal.

A system and associated method for detecting lighting strikes on a wind turbine uses a plurality of lightning strike conductors that are connected to any combination of the wind turbine components. A common ground cable is connected to the conductors and to a wind turbine grounding system. A sensor is operatively configured on the common ground cable to detect current flowing through the cable from a lightning strike incident on any one of the receptors, with the sensor producing a signal proportional to the intensity of the lightning strike.

A boost converter for high power and high output voltage applications includes a low voltage controller integrated circuit and a high voltage, vertical, discrete field effect transistor, both of which are packed in a single package.

The invention discloses an online monitoring method of a switch cabinet lightning arrester, a double indirect electricity testing method of equipment at the wire outgoing side of a high-voltage switch cabinet, and a device for realizing the method. In the method and a matched device thereof, a voltage signal and a current signal are simultaneously taken as signal monitoring input signals of the switch cabinet lightning arrester, the input signal is subjected to digitalized processing so as to display a specific value of a primary voltage of the equipment at the wire outgoing side in real time, to be capable of collecting the action times of the lightning arrester in a switch cabinet, the accurate time of each action, the leakage full current and resistance current of each phase of the lightning arrester, and automatically recording the values of the full current and resistance current in a set time. The device is provided with three current indicating lamps which are directly connected with a three-phase lightning arrester. The current indicating lamps can be turned on by the leakage current of the lightning arrester directly so as to achieve the purpose of indicating electricity. The leakage current indicating lamps of the lightning arrester and line primary voltage form double indirect electricity testing so as to reach the standard of switch cabinet indirect electricity testing.

Systems and methods for environmental monitoring of high activity facilities, generally comprising low profile devices having sensing elements for various environmental uses, designed to provide the wireless communications network as a basis for performing a wide variety of tasks. The devices may be installed on an existing electrical system and may measure, among other things, electrical current on various circuits.

An output current calculating circuit for a flyback converter operating under CCM and DCM is disclosed. The off current value I_ON and the blanking current value I_LEB flowing through a sensing resistor are calculated using a detection module and are summed together using a current summing unit. A voltage converted from the sum value of the off current value I_OFF and the blanking current value I_LEB is transmitted through an output stage in a predetermined time ratio of a cycle with the duty cycle determined by a logic control unit, in which the logic control unit controls the output stage to receive the voltage converted from sum current in a predetermined time period of each cycle, and prevents the output stage to receive the voltage converted from sum current in the remaining time other than such predetermined time period of each cycle.

Vertical sense devices in vertical trench MOSFET. In accordance with an embodiment of the present invention, an electronic circuit includes a vertical trench metal oxide semiconductor field effect transistor configured for switching currents of at least one amp and a current sensing field effect transistor configured to provide an indication of drain to source current of the MOSFET. A current sense ratio of the current sensing FET is at least 15 thousand and may be greater than 29 thousand.

A shock detector having an electrical detector having a set of water immersible electrodes for detecting hazardous water conditions through the determination of the presence of either an electrical current in a body of water, a voltage in the body of water or a voltage gradient in the body of water and then providing an alert to the existence of hazardous electrical conditions in the body of water which in some cases may transmitted to a power source to shut off a power source thereby removing the hazardous water condition.

The invention discloses a non-contact electroscope and an electroscopy and belongs to the field of electrical equipment. The electroscope comprises an inducing module, a distance measurement module and a processing module. The inducing module is used for detecting electric field intensity of an object to be detected. The distance measurement module is used for detecting the distance between the electroscope and the object to be detected. The processing module is used for judging whether the object to be detected is electrified or not according to the detected distance between the electroscope and the object to be detected and the detected electric field intensity. Due to the fact that the non-contact electroscope judges whether the object to be detected is electrified or not according to the electric field intensity of the object to be detected, the distance between the electroscope and the object to be detected and the corresponding relation between the distance and the electric field intensity, the situation that due to influences of the ambient environment, detection accuracy is low is avoided, detection accuracy is improved, and potential safety hazards are eliminated.

The invention belongs to the field of high-tension distributing line electricity verification and ground lead and particularly relates to a robot system based on high-tension distributing line electricity testing and ground lead operation. The robot system comprises a robot body, wherein the robot body comprises a moving mechanism and a three-degree of freedom mechanical motion arm connected with each other and further comprises a control box mounted on the robot body; a control unit, a first power module and a first communication module are mounted in the control box; the first power module is connected with the control unit; the control unit is connected with a driving module; the driving module is connected with the moving mechanism and the three-degree of freedom mechanical motion arm; and the control unit is connected with a handheld control terminal and a ground control terminal through the first communication module. According to the invention, a robot is adopted to replace a field operation worker to finish electricity verification and ground lead operation, so that the field operation worker is prevented from dangerous and onerous electric power operation, and the defects that manual operation is low in degree of automation and high in labor strength and risk are overcome.

A tunable photonic crystal device comprises: alternating layers of a first material and a second material, the alternating layers comprising a responsive material, the responsive material being responsive to an external stimulus, the alternating layers having a periodic difference in refractive indices giving rise to a first reflected wavelength; wherein, in response to the external stimulus, a change in the responsive material results in a reflected wavelength of the device shifting from the first reflected wavelength to a second reflected wavelength.

A broadband communications system for providing radio frequency (RF) signals to subscriber equipment that includes an amplifier for amplifying the RF signals and for providing an indication of the presence of the RF signals. The amplifier includes an input for receiving the RF signals, a first gain circuit for amplifying the RF signals and providing amplified RF signals, and an output for providing the amplified RF signals to the subscriber equipment. An RF detector included within the amplifier where there is a tap circuit for diverting a portion of the amplified RF signals, the tap circuit connected between the first gain circuit and the output, a gain circuit for amplifying the diverted RF signals, a rectification circuit for converting the amplified diverted RF signal to a DC voltage, a comparator for comparing the DC voltage to a reference voltage, and an indicator connected to the comparator for indicating when the DC voltage exceeds the reference voltage, whereby the DC voltage exceeding the reference voltage indicates the presence of an RF signal.

A monitor circuit has a first detection module for detecting an input signal and for generating a first examining signal according to the input signal, a second detection module electrically connected to the first detection module for generating an output signal according to the first examining signal, and a control unit electrically connected to the first and the second detection modules selectively for controlling the second detection module to generate the output signal according to the first examining signal, for controlling the first detection module to monitor the output and to generate a second examining signal, or for comparing the first examining signal with the second examining signal so as to determine if the monitor circuit is functioning normally.