Abstract: The present invention provides an isolated power supply having a fast output response, comprising an isolated power supply and a control unit. The isolated power supply includes a primary side power-stage unit, a secondary side power-stage unit, and an isolation transformer, and the control unit includes a primary side control unit, a secondary side control unit, and a photo-coupling isolation unit.

Abstract: A radio frequency (RF) positioning system comprises transceivers, positioning tags, processing units and a computing host. One or multiple positioning tags are attached to a target object being located. When the transceivers first generate and transmit transmission signals, one or multiple tag antennas in the positioning tag receive the transmission signals and transmit back modulated signals. The transceivers then receive and transmit the modulated signals to the processing units. The processing units are configured to obtain received signals, and calculate frequency differences based on the received signals and the transmission signals. The computing host calculates position coordinates of tag antennas based on the frequency differences, and then calculates the orientation of the target object being located according to the position coordinates of the tag antennas.

Abstract: A radio frequency (RF) positioning system comprises transceivers, positioning tags, processing units and a computing host. One or multiple positioning tags are attached to a target object being located. When the transceivers first generate and transmit transmission signals, one or multiple tag antennas in the positioning tag receive the transmission signals and transmit back modulated signals. The transceivers then receive and transmit the modulated signals to the processing units. The processing units are configured to obtain received signals, and calculate frequency differences based on the received signals and the transmission signals. The computing host calculates position coordinates of tag antennas based on the frequency differences, and then calculates the orientation of the target object being located according to the position coordinates of the tag antennas.

Abstract: The present invention provides a LLC resonant converter with magnetic-flux balance control circuit. The LLC resonant converter comprises a primary-side circuit and a secondary-side circuit, wherein the control loop of secondary-side circuit comprises a voltage control unit, a digital pulse-width-modulation generation unit, and the control loop of primary-side circuit comprises a DC detection unit, a balance control unit, a digital pulse-width-modulation generation unit.

Abstract: An alternator apparatus and a voltage converter thereof are provided. The voltage converter includes a voltage converting circuit and an auxiliary circuit. The voltage converting circuit has a first power end, a second power end and an inductor. The voltage converting circuit converts a first voltage on the first power end to generate a second voltage on the second power end during an operation time period, or the voltage converting circuit converts the second voltage on the second power end to generate the first voltage on the first power end during the operation time period. The auxiliary circuit forms a first loop between the first power end and the inductor during a reset time period, or forms a second loop between the second power end and the inductor during the reset time period, or forms a third loop in the auxiliary circuit.

Abstract: A multi-antenna system uses non-radiation coupling edges to achieve isolation. A first radiation antenna, a second radiation antenna and at least one isolator are disposed on the surface of a substrate, wherein each of the first radiation antenna and the second radiation has a resonance radiating portion, a feeding portion, and at least one non-radiation coupling edge. The isolator is disposed between the first and second radiating antennas, extending from the non-radiation coupling edge of the first radiating antenna to that of the second radiating antenna. By disposing the isolator beside the non-radiation coupling edges, the near field coupling energy between the first and second radiating antennas is cancelled out, thereby improving the isolation of the antenna. By changing the length of the isolator, the resonant frequency of the system can be adjusted.

Abstract: The present invention discloses a folded trolley structure, which comprises a front rod, a handle stem, a rear rod, a first support rod and a second support rod, wherein a fixing block fixed on the rear rod is disposed on the rear rod; the slider is provided with a control hole; the rear rod is provided with a movable button and a return spring capable of allowing the button to be extended out of the rear rod and into the control hole; an elastically movable pull member is articulated on the fixing block; a first clamping member is disposed on the pull member; a second clamping member corresponding to the first clamping member is disposed on the slider; after the clamped connection between the first clamping member and the second clamping member, the slider and the fixing block are mutually fixed and cannot be separated.

Abstract: A method of fabricating a heat exchanger unit is provided. The method includes forming a first heat exchange component by providing a first inlet interface device; providing a first outlet interface device; providing a first set of pipes; and connecting respective first ends of each of the first set of pipes to the first inlet interface device and connecting a respective second ends of the each of the first set of pipes to the first outlet interface device. The method further includes forming a second heat exchange component in the same fashion as the first heat exchange component. The method also includes overlapping the first and second heat exchange components and cross-coupling the first set of pipes and the second set of pipes at a plurality of joints.

Abstract: A receiving and transmitting device for wireless transceivers is revealed. The device has been developed from a high isolation MIMO (multiple-input multiple-output) antenna used for 2.45 GHz WLAN operation. The antenna is a dual-fed coupled monopole MIMO antenna that includes a dielectric substrate and a MIMO antenna. A grounding portion with two signal ends for feeding signals is disposed on the dielectric substrate. A T-shaped metal plate is extended from the grounding portion and located between two signal ends. A C-shaped parasitic element is arranged at the metal plate and there is a certain distance therebetween so as to adjust the isolation. The antenna is symmetrical for improving isolation and is suitable for USB dongles or small-sized wireless mobile devices.

Abstract: A receiving and transmitting device for wireless transceivers is revealed. The device has been developed from a high isolation MIMO (multiple-input multiple-output) antenna used for 2.45 GHz WLAN operation. The antenna is a dual-fed coupled monopole MIMO antenna that includes a dielectric substrate and a MIMO antenna. A grounding portion with two signal ends for feeding signals is disposed on the dielectric substrate. A T-shaped metal plate is extended from the grounding portion and located between two signal ends. A C-shaped parasitic element is arranged at the metal plate and there is a certain distance therebetween so as to adjust the isolation. The antenna is symmetrical for improving isolation and is suitable for USB dongles or small-sized wireless mobile devices.

Abstract: A circularly polarized antenna and a manufacturing method thereof. The manufacturing method includes disposing a radiation metal sheet and a ground metal sheet on a top and bottom surfaces of a substrate, respectively, disposing a metal microstrip comprising a first and a second metal microstrip segment on corner regions of the top and bottom surfaces of the substrate and a third metal microstrip segment on a side wall of the substrate, wherein the third metal microstrip segment is electrically connected to the first metal microstrip segment and the second metal microstrip segment, connecting one end of a signal-fed component to a system ground unit, connecting the other end of the signal-fed component to the second metal microstrip segment, and regulating dimensions and locations of the radiation metal sheet, the ground metal sheet, the second metal microstrip segment and/or the first metal microstrip segment so as to optimize signal characteristic of the circularly polarized antenna.

Abstract: An ultra-wideband (UWB) antenna is provided. It comprises a dielectric substrate, a ground plate, a metal plate, and a transmission line. The ground plate formed on the dielectric substrate has a first slot thereon. The metal plate formed on the dielectric substrate has a feed-point and a second slot thereon. The total length of the second slot is about a half-wavelength at the desired notched frequency for the UWB antenna. By embedding the second slot of a suitable length on the metal plate resided in the first slot, a band notched characteristic is achieved for the antenna in the 5 GHz band, thereby overcoming the problem of signal interference with the UWB operations. The disclosed antenna and the circuitry for the antenna system are easily integrated. With the simple structure, the fabrication cost for the antenna is also reduced.