Abstract: The present invention discloses an interleaved LLC convertor with current sharing.

Abstract: A direct current to direct current (DC/DC) converter includes a resonant converter stage, a buck stage, and a processor apparatus. The resonant converter stage includes a bridge circuit. The buck stage is configured to output an output voltage and an output current, is electrically connected in series with the resonant converter stage, and includes a buck switch. The processor apparatus is configured to sense the output voltage and the output current, and, based on the sensed output voltage and the sensed output current, to perform one of: (a) fixing a switching frequency of the bridge circuit to a predetermined maximum switching frequency and controlling the output voltage by controlling a duty cycle of the buck switch, and (b) fixing the duty cycle of the buck switch to a predetermined duty cycle and controlling the output voltage by controlling the switching frequency of the bridge circuit.

Abstract: A direct current to direct current (DC/DC) converter includes a resonant converter stage, a buck stage, and a processor apparatus. The resonant converter stage includes a bridge circuit. The buck stage is configured to output an output voltage and an output current, is electrically connected in series with the resonant converter stage, and includes a buck switch. The processor apparatus is configured to sense the output voltage and the output current, and, based on the sensed output voltage and the sensed output current, to perform one of: (a) fixing a switching frequency of the bridge circuit to a predetermined maximum switching frequency and controlling the output voltage by controlling a duty cycle of the buck switch, and (b) fixing the duty cycle of the buck switch to a predetermined duty cycle and controlling the output voltage by controlling the switching frequency of the bridge circuit.

Abstract: A DC/DC converter includes a transformer having a primary winding electrically connected to a resonant network and a secondary winding having a plurality of taps including a common tap, a first tap, and a second tap. The DC/DC converter further includes a plurality of rectifier circuits including a first rectifier circuit electrically connected to the common tap, a second rectifier circuit electrically connected to the first tap, and a third rectifier circuit electrically connectable to the second tap. The DC/DC converter also includes a switch electrically connected between the second tap and the third rectifier circuit. The switch is operable to electrically connect and disconnect the third rectifier circuit from the second tap.

Abstract: The present invention relates to a real time dynamic physics simulation device of flexible DC transmission system. The device includes simulated converter transformer, simulated AC field, simulated DC field, simulated converter reactor, simulated converter, and measurement and control cabinet chassis; the simulated AC field includes the vacuum switch I, the contactor I, resistors and the vacuum switch II connected orderly; the simulated DC field includes successively connected the vacuum switch contactor III and II; the simulated AC field is connected with said measurement and control cabinet chassis; Said converter transformer is set between said resistors and said vacuum switch II; Said simulated converter reactors and said simulated converter connected are set between the vacuum switch II and the vacuum switch III.

Abstract: The invention relates to Modular multilevel converter valve protection method, the modular multilevel converter valve consists of 6 arms, the arm includes sub modules, 1 arm is controlled by 1 control host, 6 control hosts is controlled by 1 summary control host, the method of the invention includes that the arm realizes locking sub module, bypass sub module, trip requests and system switching request and the summary control host implements summary and control response. The invention improves the reliability of two protection system through the use of dual redundancy protection method, clears the protection division through the layered protection frame of the upper summary control host and multi arm control host. And finally, it improves the whole safety and reliability of the modular multilevel converter valve.

Abstract: A joint equipment of a boarding bridge is provided, which is suitable for joining with a downwardly turned boarding gate of the aircraft and includes a floor frame having a concave notch at its front end; a first floor arranged at the opening of the concave notch; a sliding plate arranged under the first floor and slidable with respect to the first floor through a slide device arranged under the sliding plate; a joining plate rotatably connected in the front end of the sliding plate; a pair of front cover plates rotatably connected to the joining plate respectively; a pair of rear cover plates rotatably connected to the first floor, wherein the front cover plates are partly lapped over the rear cover plates respectively; an activating device for operating sliding movement of the sliding plate; and a pair of turning mechanisms for turning the pairs of the front and the rear cover plates respectively with respect to the joining plate and the first floor.

Abstract: A joint equipment of a boarding bridge is provided, which is suitable for joining with a downwardly turned boarding gate of the aircraft and comprises a floor frame having a concave notch at its front end; a first floor arranged at the opening of the concave notch; a sliding plate arranged under the first floor and slidable with respect to the first floor through a slide device arranged under the sliding plate; a joining plate rotatablely connected in the front end of the sliding plate; a pair of front cover plates rotatablely connected to the joining plate respectively; a pair of rear cover plates rotatablely connected to the first floor, wherein the front cover plates are partly lapped over the rear cover plates respectively; an activating device for operating sliding movement of the sliding plate; and a pair of turning mechanisms for turning the pairs of the front and the rear cover plates respectively with respect to the joining plate and the first floor.

Abstract: A videoconferencing service operating method and the videoconferencing service system thereof in which Multipoint Control Units communicate with videoconferencing terminals through a communication network is disclosed in this invention, it is characterized that through a computer network, MCUs are connected with a service center that accepts and processes videoconferencing service request, dispatches MCUs resource, manages centrally and drives videoconferencing service. A service center that is used in the said videoconferencing service operating method and system includes a Web server that receives a subscriber service request on a network, a service-processing module that receives subscriber messages sent centrally by the said Web server and dispatches MCUs resources on the computer network.

Abstract: A videoconferencing service operating method and the videoconferencing service system thereof in which Multipoint Control Units communicate with videoconferencing terminals through a communication network is disclosed in this invention, it is characterized that through a computer network, MCUs are connected with a service center that accepts and processes videoconferencing service request, dispatches MCUs resource, manages centrally and drives videoconferencing service. A service center that is used in the said videoconferencing service operating method and system includes a Web server that receives a subscriber service request on a network, a service-processing module that receives subscriber messages sent centrally by the said Web server and dispatches MCUs resources on the computer network.