Abstract:
It provides an AC-DC power converter and method for operating the same. The AC-DC power converter includes: an AC-DC conversion circuit with first controllable power switches, being configured to receive a first AC power and output a first DC power generated from the first AC power; a plurality of DC-DC conversion circuits each with intermediate conversion into a second AC power, being configured to receive the first DC power and output in combination a second DC power, wherein each of the plurality of DC-DC conversion circuits includes a full-bridge DC-AC conversion circuit with second controllable power switches having its DC side coupled across output of the AC-DC conversion circuit and an capacitive element inserted between two ends of its AC side; and a controller, being configured to: generate first control signal for turning on and off the first controllable power switches of the AC-DC conversion circuit such that DC voltage of the first DC power can be regulated within a DC voltage range; and generate a plurality of second control signals each for turning on and off the second controllable power switches of the corresponding full-bridge DC-AC conversion circuit of the plurality of DC-DC conversion circuits in full-bridge mode and half-bridge modes such that the plurality of DC-DC conversion circuits exhibit a multiple of steps of voltage gain; wherein: the DC voltage range of the AC-DC conversion circuit is set to cover voltage increase from two successive steps of the voltage gain.
Abstract:
Disclosed is a DC to DC converter (1). The DC to DC converter includes a first H-bridge converter circuit, a second H-bridge converter circuit sharing a phase leg with the first H-bridge converter circuit, a first rectifier circuit (12), a second rectifier circuit (14), a first transformer (11) and a second transformer (13). The primary winding of the first transformer is connected to the output terminals of the first H-bridge converter circuit, and the secondary winding of the first transformer is connected to the input terminals of the first rectifier circuit. The primary winding of the second transformer is connected to the output terminals of the second H-bridge converter circuit, and the secondary winding of the second transformer is connected to the input terminals of the second rectifier circuit. One of the output terminals of the first rectifier circuit and one of the output terminals of the second rectifier circuit are connected in series. The first rectifier circuit can compensate an insufficient part of the rated output power to provide the output power to a load. Since the first transformer and the second transformer commonly provide power to the load during a power transmitting period, transformers with smaller power level can be used to implement the first transformer and/or the second transformer, thereby the volume of the DC-DC converter being decreased.
Abstract:
Embodiments of present disclosure provide a direct current (DC) converter, a charging system and a method of manufacturing the DC converter. The DC converter comprises a first switching circuit configured to receive a first voltage from a DC source; and a second switching circuit coupled in parallel to the first switching circuit between a first DC line and a second DC line, wherein the first switching circuit and the second switching circuit are configured to be generate a second voltage having a plurality of combinations of voltage level based on the first voltage, to cause the DC converter to provide, based on the plurality of combinations, a third voltage in a target voltage range in a manner of switching frequency adjusting. In this way, a DC converter for a wide range voltage may be reached, which supply better compatibility for various type of battery.
Abstract:
An approach is provided for specifying channel state information in a multi-carrier communication system. A determination of either spectral locations of a first carrier and a second carrier, or correlation between the first carrier and the second carrier is made. A report format among a plurality of report formats is selected based on either the determined correlation or spectral locations. Each of the report formats specifies channel state information for the first carrier and the second carrier. The channel state information includes data rate information.
Abstract:
In one aspect this invention provides a wireless communication system (5) that includes a mobile station (20) having circuitry (22, 24, 26) and a computer program controlling operation of the circuitry to make a measurement from a forward channel to obtain a measurement result value, to quantize the measurement result value in accordance with an N level quantization to obtain a code, and to report the code on a reverse channel. The wireless communication system further includes a base station (10) having circuitry (12, 14, 16) and a computer program controlling operation of the circuitry to convert the code to a number, to compare the number to a threshold and, if the comparison indicates that the number may not accurately reflect the measurement result value, to adjust the number using an adjustment factor. In these embodiments the adjustment factor, also referred to as Delta, may be a constant, or it may be a variable. In one embodiment Delta is computed by the mobile station, and is reported to the base station.
Abstract:
An approach is provided for adaptively adjusting a threshold relating to a loading condition of a communication link. The threshold (e.g., rise over thermal (ROT) threshold) is adaptively adjusted the threshold based on an overshoot rate parameter that specifies number of times a tar et rate is exceeded and based on number of occurrences of an overshoot event.
Abstract:
An approach is provided for addressing in a multiple carrier communication system. In one embodiment, a group index is assigned to a group of terminals of a communication network. The group index permits sharing of addressing indices supported by the communication network for transmission of data to the group of terminals. In another embodiment, a plurality of terminals is classified using preamble indices corresponding to the terminals into one or more classes. A multi-user packet, which utilizes the preamble indices to activate only a class of the terminals for processing the multi-user packet, is generated.
Abstract:
A method and device for content information sharing is provided. The method comprises a first device receiving a content information request from at least a second device via a network, said content information request comprises the capability information of the second device; said first device retrieving the information of the content that the first device could provide; said first device filtering the content information of the content that the first device could provide according to the capability information of the second device; and said first device sending the filtered content information of the content that the first device could provide to the second device. According to the present invention, every device could select to obtain the content information or the content that the device could process or display.
Abstract:
The present invention concerns methods for efficiently supporting Voice over Internet Protocol (VoIP) on the Forward Packet Data Channel (F PDCH) in CDMA 2000 1xEV-DV systems. Active speech in VoIP is encoded using, for example enhanced variable rate codec (EVRC), which produces 171, 80 and 16 bits per 20 ms of speech for Rate 1, Rate %2 and Rate 1/8, respectively. However, about 60% of the time a user is inactive during a speech session, so an inordinate amount of system bandwidth is comprised of rate 1/8 VoIP packets. In one embodiment of the present invention the apparatus of the present invention identifies the Rate 1/8 voice frame packets and discards them. In another embodiment of the present invention, the apparatus of the present invention identifies the Rate 1/8 voice frame packets and selects some of them for further transmission. In both embodiments the efficiency of channel utilization is increased since the amount of channel band width used to communicate relatively little information, e.g., gaps of silence, is decreased.
Abstract:
A method for adaptively adjusting power margin over a forward control channel PDCCH from a base station BS to a mobile station MS during a call. Corresponding message packets are sent in parallel over PDCCH and a data channel PDCH to an MS. The BS monitors a reverse channel ACKCH for an expected reply from the MS. If the reply is ACK, the power margin for the next subsequent transmission on PDCCH is lowered. If the reply is NACK, the power margin for the next subsequent transmission on PDCCH is lowered. If no reply is timely received, the power margin for the next subsequent transmission on PDCCH is raised. If the method is applied also to PDCH, an ACK reply causes the power margin on PDCH to decrease; a NACK reply causes the power margin on PDCH to increase, and no reply leaves the power margin on PDCH unchanged.