272results about "Two-wire dc circuits" patented technology

This disclosure describes a non-dissipative snubber circuit configured to boost a voltage applied to a load after the load's impedance rises rapidly. The voltage boost can thereby cause more rapid current ramping after a decrease in power delivery to the load which results from the load impedance rise. In particular, the snubber can comprise a combination of a capacitive element, two inductive elements, and three switches, where a duty cycle of two of the three switches controls the voltage boost. The snubber can be arranged between a DC power supply and a switching circuit configured to generate a pulsed waveform for provision to the load.

A multi-drop, packet energy transfer (PET) receiver configured to be electrically connected to a PET transmission line and an electric load comprising receiver front-end circuitry including an input configured to be electrically connected to the PET transmission line, an output; and at least one switch or at least one diode connected at the output. There is a receiver output control and conditioning circuity with an input connected to the switch / diode, an output to be connected to the electrical load. There is a bootstrap capacitor connected across the input, and a bulk capacitor connected across the output and across the electric load. There is a load controller configured to operate the switch / diode to allow power to flow into the receiver output control and conditioning circuitry during transfer periods and to prevent power to flow into the receiver output circuitry during sample periods.

The invention relates to a method for passive arc suppression in an electrical treatment of plants, comprising the step: (S400) Applying a pulse-width modulated direct electrical current (I) to the plants.

Provided is an elevator derailment detection device, which is configured to bring a first conductive wire and a second conductive wire, which are provided in a hoistway in parallel with an elevating direction of an elevating body, into conduction with each other when derailment occurs, to thereby increase a voltage applied to the second conductive wire to a level higher than a voltage applied to the second conductive wire when no derailment has occurred, and is configured to detect the derailment through detection of the increase in voltage. The elevator derailment detection device is configured to inspect the behavior of a diagnosis target by performing control to switch a state of connection between a power supply unit and the diagnosis target between a conductive state and a non-conductive state, to thereby diagnose soundness of the diagnosis target.

The present invention relates to a DC network, which has an electrical conductor and a switching unit arranged at one end of the conductor, the switching unit being used to separate an electrical connection via the conductor, wherein the switching unit comprises at least one controllable power semiconductor connected in series in a current path of the conductor, wherein, starting from the switching unit, the conductor is divided into a first and a second section, a first overvoltage protection device is connected between a connection point of the first and the second section and a second pole of the DC network, and a second overvoltage protection device is connected between an end of the second section remote from the switching unit and the second pole, and the overvoltage protection devices each have a capacitor.

A high-voltage DC electrical distribution plate with two integrated electromechanical power contactors. Chambers of fixed and movable contact terminals of the two contactors are disposed on a first of the major surfaces of the plate, while on the second major surface of the plate are disposed complementary assemblies of the two contactors, each complementary assembly including a motor intended to activate the contact terminals of the contactor in question. The other components disposed on the second major surface of the plate leave a free space constituting an area of attachment of the complementary assemblies of the two contactors, this area being dimensioned to allow the arrangement of the complementary assemblies of the contactors in two orthogonal orientations allowing the motors to activate contact terminals of different sub-assemblies of the contact chambers and thus to make the parallel or series configurations of the contactors.

An exemplary power conditioning method and system are disclosed using a power converter in combination with a diode bridge rectifier and a series transformer in which the power converter is configured to inject VARs to a high-speed rotating machine to compensate for the machine reactance. By injecting VARs into the machine using the power converter through the series transformer, the power converter can be fractionally rated, in terms of power rating, to a lower power rating which would otherwise have to be higher due to the reactance requirements due to its high-frequency input. And additionally, because of the lower power rating, the transformer can be beneficially rated for the corresponding power level of the machine. The operation of the diode bridge rectifier and a transformer does not add to the complexity of the control of the system or that of the power converter.

A battery power supply device of an electrical energy supply system for aircraft includes at least two battery modules connected to a DC power network through a positive line, a negative line, and power switching elements, wherein each module includes at least one switching device for isolating said module from said network or for connecting said module to the network.

Embodiments of this application provide a power transmission system and a power generation system. The power transmission system includes: a power conversion circuit, configured to perform power conversion on an input electrical signal; a filter circuit, including a first filter circuit and / or a second filter circuit, where the first filter circuit is coupled between an input end of the power transmission system and an input end of the power conversion circuit, and the second filter circuit is coupled between an output end of the power conversion circuit and an output end of the power transmission system; and at least one crossover capacitor group, where one end of the crossover capacitor group is coupled to the input end of the power transmission system, and the other end of the crossover capacitor group is coupled to the output end of the power transmission system, to form a loop, so that an interference signal in an electrical signal output by the output end of the power conversion circuit can return to the input end of the power conversion circuit. In embodiments of this application, the interference signal can return, which reduces a common-mode interference current at the input end and / or a common-mode interference current at the output end, and a safety Y capacitor is not required, so that a volume of a filter inductor can be reduced, and costs are reduced.

The application relates to a method and a device (10) for regulating the potential position of a first and a second DC conductor (DC+, DC-), wherein the DC conductors (DC+, DC-) are provided for supplying an electrolyzer (14) with electrical power and the electrical power can be transferred from an AC network (12) to the DC conductors (DC+, DC-) via a rectifier (20), wherein in a first operating mode the potential position of the first and the second DC conductor (DC+, DC-) is regulated such that both DC conductors (DC+, DC-) have the same polarity with respect to ground potential (GND). The application further relates to a DC network (30) comprising an electrolyzer (14), such a device (10) and the first and second DC conductors (DC+, DC-).

A PET transmitter including an input conditioning and protection circuitry electrically connected to an electrical source, having an output and a switch connected at the output. There is a front end circuit having an input connected to the switch and an output connected to a PET transmission line. There is a source controller configured to close the switch to connect the source to the output of the front end circuit during a transfer period and open the switch to disconnect the source during a sample period. Across the output of the front end circuit, there is a minimum effective cross-line capacitance that enables the source controller to differentiate a measured voltage at the output of the front end circuit indicative of a fault and a measured voltage indicative of no fault without a PET receiver being in electrical communication with the output of the front end circuit.

A DC power distribution and protection system that comprises a DC power source 2, a power bus 3, 4 connecting the power source 2 with a load R or with a further power source 20, at least one capacitor

Provided is a power supply device for a DC distribution board that improves the reliability of power supply, shortens the recovery time of a DC power supply failure, and guarantees the normal operation of equipment. 【Solution means】 A power supply device for a DC distribution board, wherein the DC distribution board is provided with a first power input line branching circuit 1 and a second power input line branching circuit 2, the power supply device includes a normal power supply, a backup power supply, and a mechanical interlock device 7, the first power input line branching circuit is connected to the normal power supply, the second power input line branching circuit is connected to the backup power supply, the mechanical interlock device is connected to the first power input line branching circuit and the second power input line branching circuit respectively, and the first power input line branching circuit and the second power input line branching circuit are prevented from being closed simultaneously.

A detection circuit of an external display device includes a first connector, a display circuit, a switch circuit, a power supply circuit, and a control circuit. The display circuit is configured to provide a display signal to the external display device via the first connector. The power supply circuit is configured to provide power required for the display circuit to operate via the switch circuit when the switch circuit is turned on. The control circuit is configured to turn on the switch circuit to turn on the power supply circuit and the display circuit when the external display device is detected. After the switch circuit is turned on, the control circuit is configured to accumulate a duration of continuous time during which the external display device is not detected or a number of times of detection, and turn off the switch circuit to turn off the power supply circuit and the display circuit when the duration of continuous time reaches a time threshold or the number of times of detection reaches a number threshold.

The invention relates to a converter (100) comprising a conversion stage (104) and an output protection circuit (106). The output protection circuit (106) comprises a first input terminal (201) and a second input terminal (202), and a first output terminal (203) and a second output terminal (204). The first input terminal and the first output terminal are on a first voltage level and the second input terminal and the second output terminal are on a second voltage level. The converter further comprises a switch S1 connected between the first input and output terminals or between the second input and output terminal, and an interruptible freewheeling circuit (120) between the first output terminal and the second output terminal. The freewheeling circuit comprises a freewheeling path (122) including a freewheeling switch and a freewheeling diode, and a voltage clamping device parallel to at least the freewheeling switch.

An in-vehicle power supply network according to the present invention is an in-vehicle power supply network that supplies power to a load installed in a vehicle via several nodes in the vehicle, wherein the several nodes include a first node that supplies power and a second node that receives the power supplied by the first node, wherein the first and the second node are connected by a power line through which the power is supplied and by a signal line through which information relating to the power is transmitted, wherein both the first and the second node have a current measuring unit that measures a current value entering and exiting the node via the power line, a current input / output unit that inputs and outputs a current proportional to the current value between the signal line and the node, and a potential measuring unit.which measures a potential of the signal line, and the signal line is terminated via a resistor at a termination potential, and it is diagnosed that an anomaly has occurred somewhere in the vehicle's internal power supply network if the potential of the signal line differs from the termination potential.

A method of operating a medical device comprises electrically connecting a power device to the medical device. The method further comprises sensing at least one characteristic of one of the medical device with the power device. The method further comprises adjusting or maintaining one or more characteristics of an electrical connection feature the power device according to the at least one observed characteristic such that the electrical connection features of the power device and medical device are operationally compatible, and operating the power device according to an operational profile associated with the medical device.

An electrical power system and an aircraft including an electrical power system are provided. The electrical power system includes: an electrical power source; a DC electrical network; a power converter including at least one input terminal and first and second DC output terminals, the at least one input terminal connected to the electrical power source, the first and second DC output terminals connected to the DC electrical network; a DC link capacitor connected between the first and second DC output terminals; a power semiconductor switch connected in series with the DC link capacitor between the first and second DC output terminals; and a control unit configured to respond to a fault in the DC electrical network by opening the power semiconductor switch, whereby discharge of the DC link capacitor is prevented.

Conveyor arrangement (1), adapted to convey an object (9), the conveyor arrangement (1), comprising, - a plurality of conveyor zones (2), each conveyor zone (2) is adapted to convey an object (9) from an inlet (1) of said conveyor zone (2) to an outlet (0) of said conveyor zone (2), each conveyor zone (2) is provided with a drive unit (3M), each drive unit (3M) is adapted to transform electrical power into mechanical power required for conveying said objects (9); - a plurality of, in particular at least two, power supply devices (21) adapted to supply electric power (P21) to the drive units (3M); - in particular at least one controller (10, 11) adapted to control operation of said conveyor zones (2); the conveyor arrangement (1) further comprising a power supply network (20), comprising - the plurality of power supply devices (21); - the plurality of drive units (3M); - at least one power supply line (23) connecting the plurality of power supply devices (21) with the plurality of drive units (3M).

The present disclosure relates to a power switch device for an escalator or moving walkway refueler, enabling an operator to safely operate the escalator or moving walkway refueler and prompting the operator to restore the power supply of the refueler to a normal state. The power switch device includes a power input port, including a first power input terminal and a second power input terminal, for connecting to an input power supply; a power output port, including a first power output terminal and a second power output terminal, for connecting to the escalator or moving walkway refueler, the second power input terminal is connected to the second power output terminal, and a first branch and a second branch connected in parallel are connected between the first power input terminal and the first power output terminal; an electric control on-off device, connected in the first branch, for controlling the on-off of the first branch according to the escalator or moving walkway operation signal; a manual switch, connected in the second branch, for controlling the on-off of the second branch; and a status indicator, for indicating the switch state of the manual switch.

This power distribution system comprises: a power converter (4) that converts the voltage of a primary-side DC bus (1) into AC or DC and outputs the AC or DC to power feeding lines (9); and a voltage controller (104) that controls the power converter (4) so as to change the output voltage to the ground of each line of the power feeding lines (9) while keeping the output voltage of the power converter (4) constant.

The present invention relates to a DC power supply device (400) for supplying operating DC power to one or more DC powered devices having corresponding DC power requirements, the DC power supply device comprising: a power interface (402) for providing DC output power via a single twisted pair wired bus (401); a DC power supply network communication unit (404) configured to receive DC power requirement information indicating a DC voltage requirement and a DC current requirement of each connected DC powered device; and a DC power supply control unit (406) configured to: drive delivery of an initialization DC output power amount in an initialization supply mode, the initialization supply mode being suitable for transmitting the corresponding DC power requirement information by the DC powered device; determine and provide operating DC output power using the DC power requirement information and a power determination rule for powering the at least one DC powered device for operation in its normal operating mode, thereby enabling powering a plurality of DC powered devices having different DC power requirements.

The application discloses a kind of suitable for symmetric unipolar-bipolar DC operating mode conversion and control method and system, applied to DC control technical field, method includes obtaining the data of symmetric unipolar-bipolar DC system;Real-time operating parameter data and system reference parameter data are handled, and fault data is obtained;Device physical parameter data are handled, and DC system digital simulation model is obtained;DC system digital simulation model is handled, and stability boundary condition is obtained;Based on fault data and stability boundary condition, DC voltage data is obtained;Based on fault data and rated voltage, determine thermal stability limit voltage data;Based on power factor data, DC voltage data and thermal stability limit voltage data are handled, and target voltage data is obtained;With target voltage data as reference, power adjustment processing is carried out.The method provided by the application can solve the technical problem that the voltage reduction operation control strategy cannot adapt to different operating conditions of the system.

The present invention relates to a smart energy management system (1) that combines all energy equipment in the energy infrastructure and enables this equipment to be smartened with artificial intelligence. Thanks to the smart energy management system (1), all devices that can access the Internet are included in the cloud network and these devices are enabled to communicate with each other through artificial intelligence. With the smart energy management system (1), a world-class infrastructure is achieved with uninterrupted communication, where high-level infrastructure is smartened, managed, sustainability and continuity are ensured. With the commissioning of the smart energy management system (1), significant energy savings are achieved.

The application provides a cross-voltage domain power supply circuit and a circuit control method, and relates to the technical field of submarine communication. The cross-voltage domain power supply circuit comprises a control module, a main power supply module, a backup power supply module and a load function circuit module; a main supply state signal of the main power supply module and a backup supply state signal of the backup power supply module are collected by a main circuit detection submodule and a branch circuit detection submodule; the control circuit submodule receives and processes the main supply state signal and the backup supply state signal, generates a switch control signal, and controls the on-off state of the first bypass switch and the second bypass switch and the connection state of the switching switch according to the switch control signal. The cross-voltage domain power supply circuit provided by the application controls the state of the switch in the circuit according to the supply state signal by the control circuit submodule, so that the main power supply module and the backup power supply module can realize intelligent switching, the heat loss in the power supply circuit is reduced, the reliability of power supply is improved, the circuit structure is simple, and the space occupation is reduced.

Modular power supplies and configurations of connecting the same. One example provides a power supply system comprising a battery extender configured to output first direct current (DC) power and a power station electrically connected to the battery extender. The power station includes a battery, a DC input port configured to receive the first DC power from the battery extender and an alternating current (AC) port configured to receive first AC power from an external power supply. The power station also includes a DC output port configured to provide second DC power to a first connected device, and an AC output port configured to provide second AC power to a second connected device.

According to the present invention, the functional module is charged through the power supply module before and during communication of the functional module by using a bus connecting the power supply module and the functional module, in order to achieve multi-master power supply communication between multiple functional modules using two power lines, thus solving the technical problems of a lack of a streamlined multi-master power supply communication system and a weak driving capability in the current bus communication mode.

Technologies are described herein for a two-wire power delivery system that may be employed by a mobile device with a reversable cable. The described techniques allow for the two-wire power cable to be inserted in any orientation into the mobile device, without requiring a special keying or registration element, and without requiring any additional pins or wires. The mobile device includes a passive protection circuit that assists the two-wire power cable system in detecting the correct orientation for power delivery.

The present DC power supply and distribution system comprises: a plurality of power distribution lines each connected to a respective one of a plurality of loads; a first converter to receive an AC voltage from a commercial AC power source, convert the received AC voltage into a plurality of DC voltages and supply each of the plurality of DC voltages to a respective one of the plurality of power distribution lines; a second converter to receive a DC power from a power generating and / or storing source, convert the received DC power into a plurality of DC powers, and supply each of the plurality of DC powers to a respective one of the plurality of power distribution lines; and a controller to enhance the second converter in efficiency by controlling the first converter so that a ratio of the plurality of DC voltages is a predetermined first ratio.