43results about How to "Correct polarity" patented technology

The invention discloses a dispatching end grid fault diagnosis method based on wide-area fault recording information. The method comprises the following steps that when a grid breaks down, fault data of a primary system of the grid are recorded according to a certain sampling frequency mode and are sent to a dispatching main station end through a fault recording networking system; the mapping relation between a basic data platform of grid equipment and a fault recording system is established through CT identification; different sampling frequencies of a fault recorder are unified to be the same sampling frequency according to an interpolation method; a differential-current out-of-limit value is set and independent grid equipment serves as a calculation unit to carry out differential-current calculation; whether the differential-current value is out of limit is confirmed to position fault places and confirm protection actions. The dispatching end grid fault diagnosis method has the advantages of solving the key problems that sampling frequency of the fault recorder is different and data are hard to synchronize, and achieves fault diagnosis application functions such as system operation state monitoring, protection behavior analyzing and accurate fault positioning through the fault recording information only.

An optical, multi-channel, Differential Phase Shift Keying (DPSK) receiver demodulates multiple Wavelength Division Multiplexed (WDM) channels using at least one interferometer. This distributes expense of the interferometer(s) over all channels of an optical signal, allowing for deployment of cost-effective, scalable, wideband, WDM DPSK systems. For example, for an 80 channel WDM link, the receiver uses a single interferometer instead of eighty interferometers and associated stabilization hardware, dramatically reducing size, weight, power, and cost. The receiver is architecturally compatible with existing interferometer technologies so previous development and qualification efforts can be leveraged. This allows for expedited technology insertion into existing optical communications networks, including terrestrial and space-based optical networks.

A variable delay circuit uses a plurality of inverters or inverting gates as delay elements in a delay line. In one embodiment of the invention, the point in the delay circuit at which an input clock signal enters the delay circuit is adjusted to vary the delay of an output clock signal. In another embodiment, the point in the delay circuit from which the output clock signal exits the delay circuit is adjusted to vary the delay of an output clock signal. In either case, the polarity of the input or output clock signal is adjusted as the delay is adjusted so there are always an even number of inverters or inverting gates between an input terminal to which the input clock signal is applied and an output terminal from which the output clock signal is generated.

An electronic animal containment system with direction-of-approach determination, or direction-sensitive animal containment system. The direction-sensitive animal containment system generally contains a transmitter unit connected to a wire loop bounding a containment area and a receiver unit carried by the animal. The direction-sensitive animal containment system of the present invention generates a containment field having polarity and retains the polarity information when the containment field is sensed using a sensing coil optimized along the azimuth. The receiver unit also generates a gravity vector to determine the orientation of the receiver unit. The gravity vector is combined with the containment field vector to produce a function that automatically yields a sensing coil output that is independent of the orientation of the receiver unit. The polarity of the sensing coil output allows determination of the direction from which the receiver unit is approaching the wire loop.

A circuit including at least one low voltage input, at least one high voltage output, and a field transistor having a source, a drain and a control region. The circuit may comprise a high-voltage amplifier. In this embodiment, an electrical connection between the high-voltage output terminal and the field transistor control region, and an electrical connection between the input terminal and a second transistor. Various embodiments of the field transistor are described.

A multi-battery charger for at least one rechargeable battery includes a charger case, and a multi-battery charging module. The charger case includes a plurality of electrically neutral charging terminals spacedly provided thereon, and an electric input terminal adapted for electrically connecting with an external DC power source. The multi-battery charging module is provided in the charger case to electrically communicate with the charging terminals, and includes a recharging circuitry and a polarity detection circuitry. The polarity detection circuitry is electrically connected with the recharging circuitry to accurately detect a positive polarity and a negative polarity of the first and the second battery terminal when the first and the second battery terminals are electrically connected with two of the charging terminals, in such a manner that when a correct polarity of the first and the second battery terminals is determined, the recharging circuitry is activated to properly recharge the rechargeable battery.

Quick-connect disconnect connectors are provided as part of an electrical assembly used to electrically couple components to the end of an electrical track section. The connectors have a tongue portion insertable into the end of the track only one way to ensure against cross-wiring and include structures for retaining electrical contacts and strain reliefs. The connectors readily disconnect from the end of the track when force is applied which might be sufficient to damage the track or electrical assembly to prevent such damage.

A battery powered flashlight is described that has a pivot contact with an off-center pivot point and/or battery polarization is described. The flashlight is configured to allow batteries to be dropped into place without interference with internal flashlight components.

The invention discloses a method for checking a differential protection secondary circuit of a transformer, and belongs to the field of differential protection of an electric power system. Through a mode of arranging a three-phase large current generator on the low voltage side of the transformer, the checking method solves the problem that an on-load test of secondary connection of a differential protection current transformer of the transformer cannot be carried out because the load current of the conventional to-be-protected transformer is too low. The checking method judges whether the parameter setting of a differential protection device is correct by means of comparing the induced current, acquired by the differential protection device, of a secondary winding of the current transformer with the theoretical value. The checking method judges whether the connection of a differential protection secondary circuit is right according to the condition that whether the differential current is 0. The checking method judges whether the polarity of the current transformer of the differential protection secondary circuit is correct according to the condition that whether the induced current of the secondary winding of the same-side three-phase current transformer is in a positive phase sequence. The method is suitable for checking the differential protection secondary circuit of the transformer.

Whether or not one utilizes direct DC coupling of the microradios to the antenna feed points or couples the RF energy from the dipoles associated with the spaced-apart contact pads on the microradio, in the subject invention one selects only those microradios that are within a certain variance of a preferred direction and then makes sure that the polarization direction of all of these radios is in the preferred direction are identical, in one embodiment by utilizing digital coding, which both activates the microradio and is used to sense the polarity associated with the connection from the signal source to the contact pads.

A power supply polarity protection circuit comprises a first input terminal, a second input terminal, an electronic switch, a relay, a positive output terminal and a negative output terminal; wherein, the relay is provided a first normally open contact, a second normally open contact, a first normally closed contact and a second normally closed contact; the first input terminal and the second input terminal are respectively connected with an anode and a cathode of a DC power supply; a first terminal and a second terminal of the electronic switch are respectively connected with the first input terminal and the second input terminal; a third terminal of the electronic switch is connected with the first input terminal via the relay; the first input terminal and the second input terminal are respectively connected with the positive output terminal and the negative output terminal via the first normally open contact and the second normally open contact, and are also respectively connected with the negative output terminal and the positive output terminal via the first normally closed contact and the second normally closed contact; the positive output terminal and the negative output terminal are respectively communicated with the first input terminal and the second input terminal via the first normally closed contact and the second normally closed contact or via the first normally open contact and the second normally open contact to output correct polarity. The power supply polarity protection circuit is simple in structure.

This invention relates to a LED lamp holder, and more particularly to a LED lamp holder enabling a LED bulb to be correctly mounted according to its polarity, when using LED lamp strings. A LED lamp holder comprises a soft head having a columnar shape and made of insulated materials, a stopper-shaped soft core made of insulated materials and preassembled with a LED bulb having a long polarity and a short polarity, two connecting plates disposed on ends of two wires, wherein the soft core and the connecting plates are inserted into each other respectively from two ends of the soft head and mounted in the soft head, and two polarities of a LED bulb connect with two connecting plates respectively, wherein the soft core has a high polarity-fixing portion and a low polarity-fixing portion on the end thereof which joins with the connecting plates, the long polarity of LED lamp fixed on the high polarity-fixing portion, and the short polarity of LED lamp on the low polarity-fixing portion; the soft core has a first plane on an outside surface thereof and the soft head has a second plane on an inside surface thereof which corresponds to the first plane of the soft core to limit the circumferential location of the soft core in the soft head; the soft head has a polarity-distinguishing device on the outside thereof. So the invention provides a LED lamp holder which enables a LED bulb to be correctly mounted according to its polarities.

To realize a stable operation and the suppression of heat generation in the case where an excitation current supplied from a converter is used to generate a power source voltage, a standard signal generator is provided. The standard signal generator includes an input circuit that includes: a rectification circuit that rectifies an excitation current; a resistor that is provided between a power source voltage output terminal for supplying a power source voltage and an output terminal of the rectification circuit; an amplification circuit that outputs an output voltage obtained by amplifying a voltage across both ends of the resistor; and a constant voltage circuit that performs control such that the power source voltage is constant. A power source voltage switch switches the power source voltage with the constant voltage circuit being controlled in accordance with the result of a comparison between the output voltage and a prescribed threshold value.

The invention discloses an inductance encapsulating machine, relating to the technical field of electronic machine manufacturing. The inductance encapsulating machine comprises a control box and a stand, wherein a band collecting shaft driven by a band collecting motor and a band feeding shaft driven by a band feeding motor, an upper paper reel and a carrier band guide wheel are arranged on the stand, a lower reel conveyor track is arranged between the band collecting shaft and the band feeding shaft, a carrier band guide groove is arranged on the lower reel conveyor track, a base is arranged on the tail end of the lower reel conveyor track, a hot end socket on a vertically arranged guide rail is arranged above the base, and an electromagnetic driver is connected between the stand and the hot end socket. According to the inductance encapsulating machine, the problem that a terminal user cannot correct take and use components due to encapsulated component polarity faults caused when inductance components on a carrier band jump because of instability in pull force of the encapsulating machine can be solved.

The invention relates to a power polar protective circuit, which comprises a first input end, a second input end, a comparison amplifier, a first electronic switch, a second electronic switch, a third electronic switch, a fourth electronic switch, a positive output end and a negative output end. A positive input end and a reverse input end of the comparison amplifier are connected to the first input end and the second input end respectively; when the first input end and the second input end are connected with a positive electrode and a negative electrode of a DC power supply respectively, the first electronic switch and the second electronic switch are conducted, and the positive output end and the negative output end are communicated with the first input end and the second input end respectively; and when the first input end and the second input end are connected with the negative electrode and the positive electrode of the DC power supply respectively, the positive output end and the negative output end are communicated with the second input end and the first input end through the fourth electronic switch and the third electronic switch, so that a correct polar is output. The power polar protective circuit has a simple structure.