The Hong Kong Polytechnic University

Other

City University of Hong Kong

Chi Kong Tse

Franki Ngai Poon

Wai Man Tam

Chung Ming Lau

Siu-Chung Wong

Xiaohui Qu

Xiaolu Li

The present invention provides a reconfigurable single-inductor multiport converters comprising a single inductor, a primary input port, a primary output port and a plurality of reconfigurable cells, each including a bidirectional port which is reconfigurable to be an auxiliary input port configured to share the inductor and work with the inductor to form an input cell or an auxiliary output port configured to work with a corresponding capacitor to form an output cell; and a plurality of switches arranged for facilitating the bidirectional port to act as auxiliary input port or auxiliary output port; and regulating bidirectional power flowing through the bidirectional port. The present invention provides a simple and low-cost solution for integrating multiple sources and loads simultaneously. The adoption of single-inductor design minimizes the use of magnetic components and the independent output cells configuration avoids cross-regulation problem among output ports, which simplifies the control design.

Reconfigurable single-inductor multiport converter

The present invention discloses a current-source-output light-emitting-diode (LED) driver based on LCLC circuit to provide a constant output current regardless of variations in LED parameters. In the LCLC circuit, the number of additional capacitors is scalable with the number of LED strings for current balancing. Moreover, the input impedance of the improved LCLC circuit is designed to be resistive at the operating frequency to minimize reactive power. The conventional duty cycle control can easily incorporate zero-voltage-switching (ZVS).

Multi-string LED driver with current balancing

An approximated lower-triangle structure for the parity-check matrix of low-density parity-check (LDPC) codes which allows linear-time-encoding complexity of the codes is disclosed, and the parity part of the parity-check matrix is semi-deterministic which allows high flexibility when designing the LDPC codes in order to provide higher error-correction capabilities than a typical dual-diagonal structure.

Method and system for encoding and decoding low-density-parity-check (LDPC) codes

The fast transient load corrector is a circuit that attaches to the output terminals of a switching converter. Requiring no feedback circuit that interacts with any control parameter of the switching regulator, the fast transient load corrector works independently to improve the transient response of any switching regulator. Effectively the fast transient load corrector combines with the actual load to form a slowly varying composite load which permits the switching converter to maintain a well regulated output voltage or a voltage of pre-defined waveform. The conceptual construction consists of a bi-directional controlled current source and either a voltage sensor or a current sensor. The voltage or current sensor measures the amount of load disturbance and triggers the bi-directional controlled current source to supply transient current to the load. The quantity to be sensed can be the output voltage, the rate of change of the output voltage, or the rate of change of the output current. A practical construction, in the case of voltage sensing, consists of a pair of comparators which determine the deviation of the output voltage from the nominal value and trigger the action of the bi-directional controlled current source to supply transient current to the load. A practical construction, in the case of current sensing, consists of a negative feedback operational amplifier which, with a first-order circuit and sensing resistor, limits the rate of change of the output current and triggers the action of the bi-directional controlled current source to supply transient current to the load.

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Hong Kong, China

Chi Kong Tse