Abstract:
A power conversion device includes a full-bridge switch circuit, a converter circuit, and a control circuit. The full-bridge switch circuit is operable to convert a direct current input voltage to a converted voltage. The converter circuit converts the converted voltage into a direct current output voltage. The converter circuit includes a resonant inductor, a transformer, a first converter switch, a second converter switch, an output inductor, and an output capacitor. The direct current output voltage is provided across the output capacitor. The control circuit controls the full-bridge switch circuit, the first converter switch and the second converter switch based on the direct current output voltage and a reference voltage.
Abstract:
First and second positioning devices disposed at first and second stationary locations transmit first and second pilot signals, respectively. Transmission coverages of the first and second pilot signals have an area of overlap. When a mobile robot moves to the area of overlap, the mobile robot determines first angular orientation information between the mobile robot and the first positioning device, and second angular orientation information between the mobile robot and the second positioning device. The mobile robot then determines an initial position of the mobile robot based on the first stationary location, the second stationary location, the first angular orientation information, and the second angular orientation information.
Abstract:
A method of manufacturing LED packages includes the steps of: forming a conductive circuit layer on a substrate; screen printing a wall layer on the conductive circuit layer to form a trellis with a plurality of wall units, so that regions of the conductive circuit layer surrounded by the wall units are exposed; mounting and electrically connecting at least one LED die on the conductive circuit layer within each of the wall units; molding a transparent layer to cover the LED dies; and cutting along the wall units to form a plurality of LED packages.
Abstract:
In a method for selecting an operation channel, a wireless network connecting apparatus is configured to: identify at least one preoccupied channel; determine a plurality of available channels; evaluate a channel quality of each of the available channels; select one of the available channels based on the channel quality thereof as the operation channel, and to switch to the operation channel; transmit an evaluation packet through the operation channel; determine whether the operation channel needs to be replaced, based on a number of data retransmissions; and exclude the operation channel from the available channels when the determination is affirmative.
Abstract:
A power supply device includes a main unit and a power switching module. The main unit includes a primary circuit board, a transformer including a primary and a secondary coil, a primary-side circuit and a secondary-side circuit. The power switching module includes a separate PCB formed with at least two connection pads and two conductive tracks, and at least one power switching element disposed on the PCB and having two terminals respectively connected to the two connection pads through the two conductive tracks . The power switching module is in the form of a separate PCB that is electrically connected to the primary- or secondary-side circuits through the two connection pads.
Abstract:
A light emitting device includes a substrate having a top surface, upper and lower metal layers, multiple LED chips, at least one Zener diode, multiple conductive wires and an encapsulant. The top surface includes a central region bounded by an imaginary boundary with a profile conforming to an outline of a circle stacked with a polygon. The central region has a die bonding area corresponding to the circle, and at least one polygonal extension area formed outside the die bonding area. The upper metal layer includes multiple conducting pads surrounding the central region. The LED chips are disposed on the die bonding area. The Zener diode is disposed on the polygonal extension area. The encapsulant is disposed on the substrate and covers the LED chips.
Abstract:
In a method for generating image depth maps for image frames included in a video, an image processing device is configured to: acquire a full depth map of an nth image frame of the video; find a to-be-processed region of an (n+m)th image frame of the video, the to-be-processed region differing from a corresponding region of the nth image frame of the video; process the to-be-processed region of the (n+m)th image frame of the video for generating a partial depth map that corresponds to the to-be-processed region; and generate a full depth map of the (n+m)th image frame of the video by using the partial depth map to replace a part of the full depth map of the nth image frame of the video that corresponds in position to the partial depth map.
Abstract:
A method is for allowing a wireless target device to automatically connect to a target network. The method is to be implemented by a wireless executing device in a wireless network system. In the method, the wireless executing device is configured to establish an ad-hoc wireless network with the wireless target device, and to transmit an access setting to the wireless target device over the ad-hoc wireless network. The access setting enables the wireless target device to connect to the target network automatically.
Abstract:
An LED package structure includes: an insulating substrate that has a front bonding pad assembly; a dark-colored die-attach adhesive; blue and green LED chips mounted on the front bonding pad assembly via the dark-colored die-attach adhesive; and a dark-colored and light-transmissible encapsulant that is disposed on the insulating substrate and that encapsulates the blue and green LED chips. The encapsulant has a light transmittance that ranges from 7% to 28% for the blue light and has a light transmittance that ranges from 9% to 30% for the green light.
Abstract:
A control method for implementation in a power supply system includes steps (A), (B), and (C). In step (A), while the power supply system is providing electricity to a load, a control circuit determines, an estimated capacitance value related to an output capacitor. In step (B), while the output capacitor is providing electricity to the load, the control circuit determines an average power value related to the electricity provided by the output capacitor to the load. In step (C), the control circuit determines an estimated hold-up time value related to the power supply system based on a predetermined target voltage value, a predetermined minimum voltage value, the average power value and the estimated capacitance value.