Abstract: An adaptive dead-time controller is provided to improve a conversion efficiency of a power converter at a low/no load condition. The adaptive dead-time controller has a reference voltage generator, an error amplifier, a comparator, an oscillator, an adaptive dead-time generator and a flip-flop. The adaptive dead-time controller outputs a gate pulse according to an output voltage and an oscillation. When power converter is at a low/no load condition, the adaptive dead-time generator delays a rising edge of an oscillation signal by a dead-time from a rising edge of a clock signal, so the frequency of the gate pulse and the power consumption of the power converter are reduced.

Abstract: This invention relates to an AC power network for collecting the electric powers of distributed power cells. The AC power network of the invention includes a plurality of AC power cells, a plurality of transmission lines, and at least one resistant load. The AC power network has important properties, such as simple structure and easy setup and maintenance. In addition, when there is non-uniform distribution among AC power cells or some AC power cells are broken down, the AC power network possesses equal potential rings or equal potential planes to eliminating non-uniform distribution without decreasing its power efficiency.

Abstract: A memory management unit (MMU) includes a translation lookaside buffer capable of simultaneously servicing three requests supplied to the MMU by an instruction cache and two data caches, respectively. Also, an arbiter selects one of several pending requests from sources of different priorities for immediate processing by the MMU, using a process which avoids undue delay in servicing requests from sources of lower priority.