Other

The Hong Kong University of Science and Technology

Hong Kong Applied Science and Technology Research Institute Company, Limited

Yat To Wong

Wing Hung Ki

David Kwok Kuen Kwong

Tak Sang Yim

Chi Ying Tsui

Kam Chuen Wan

Lin Cheng

Ziang Chen

Chik Wai Ng

David Chik Wai Ng

Cheung Sing Wong

A wireless charging receiver as described herein includes a configurable rectifier configured to convert an alternating current input to a direct current output in a single processing stage, wherein the configurable rectifier comprises one or more diodes, and a controller communicatively coupled to the one or more diodes and configured to select one of a plurality of mode cycling schemes and control a present operating mode of the active diodes according to a selected mode cycling scheme. Additionally, an active diode as described herein includes a comparator, a gate driver, a power transistor, and a delay compensation circuit for compensation of at least one of a turn-on delay and a turn-off delay of the active diode, the delay compensation circuit including analog feedback loops.

Wireless charging receiver

Techniques are provided to tune a gate-drive control signal for a switching device. In an aspect, a device is provided that includes a dead-time generator circuit, a first dead-time tuner circuit and a second dead-time tuner circuit. The dead-time generator circuit generates a control signal for a first switching device that is coupled to a second switching device via a switching node. The first dead-time tuner circuit generates, based on the control signal and a switching signal indicative of a voltage associated with the switching node, a first modified control signal for the first switching device. The second dead-time tuner circuit generates, based on a modified version of the switching signal and a tuning process that repeatedly modifies the control signal until a first dead-time value satisfies a defined criterion, a second modified control signal for the first switching device.

Gallium nitride driver with tuned dead-time

A three-in-one sofa bed including a bedstead assembly; a sofa cushion and sofa seat assembly fixedly connected to the bedstead assembly; a moveable coffee table; a mattress and mattress frame assembly a proximal section of which is pivotably connected to a rear section of the bedstead assembly to enable the mattress and mattress frame assembly to be rotated with respect to the bedstead assembly between a horizontal position and a vertical position. In the horizontal position, the mattress and mattress frame assembly straddles the sofa cushion and sofa seat assembly and the movable coffee table to form a bed. In the vertical position, the sofa cushion and sofa seat assembly and the movable coffee table are exposed. Balance weights are provided for the mattress frame between adjacent pulley grooves, to make torque in front of central axes of the pulleys be equal to that behind the central axes.

Three-in-one sofa bed

A multifunction barbecue oven includes a main furnace, an auxiliary furnace arranged below the main furnace and a charcoal disc selectively placed on the bottom of the main furnace or the bottom of the auxiliary furnace. The top of the main furnace has an inclined tile roof shaped main furnace top portion with hinged left and right triangular side plates and a detachable connecting rod means. The furnace chamber can be covered by hinged front and rear covers. The handled fork can be inclined erected on top portion of the main furnace or inclined inserted into the interior of the main furnace chamber and the auxiliary furnace chamber for grilling or roasting in a hanging manner to avoid the food to contact the iron grid. The barbecue oven can be used for grilling, roasting, grilled and hot pot cooking and other function, and can be stored and carried conveniently.

Multifunction barbecue oven

A feedback controller comprises first and second feedback circuits. The first feedback circuit is connected between an input node and an output node and has an error node. The first feedback circuit comprising a feedback amplifier for comparing a feedback signal to a reference signal and providing an error signal, and a comparator for comparing the error signal to a second reference signal and providing an output signal. The second feedback circuit is connected between the input node and the error node and comprises a current source coupled to the error node and a controller coupled to the input node for controlling the current source in response to a value of the feedback signal being above or below a threshold value.

Feedback controller having multiple feedback paths

Systems and methods which provide an oscillator circuit outputting non-overlapping trigger signals throughout a range of operating voltages using a reset-set (RS) flip-flop type circuit configuration are shown. Embodiments utilize output driver buffers internal to the RS flip-flop circuit configuration to provide oscillator feedback delay. Feedback control circuitry may be implemented to ensure that the delay associated with any one driver buffer does not solely provide the feedback delay. Embodiments further implement input delay circuitry adapted to maintain a relatively constant reset and set input feedback delay ratio throughout a large range of operating conditions.

Growing community of inventors

Hong Kong, China

Yat To Wong