Abstract: The present invention relates to variable speed constant frequency (VSCF) devices and methods for maximizing engine generator efficiency. In one embodiment, a VSCF device may include at least two paths for conducting power to the load. One path, a line inductor path, may advantageously incur minimal power loss when the engine generator is supplying rated power to a load. A second path, a VSCF path, may be used to ensure that the frequency of the power is maintained at a substantially constant frequency under various load conditions. Another embodiment of the invention describes a process for determining optimal engine generator speed for a particular load. Because engine speed can be varied using any VSCF device, this process determines a speed that minimizes fuel consumption, emissions, and noise pollution for a given load.
Abstract: To provide an IC chip for contactless IC card that ensures reliabilities such as data retention of nonvolatile memory and reduces power consumption. Power supply voltages VDD and VSS, which are output from a rectifier circuit, are used as a power supply for driving an analog circuit, digital circuit, and memory control circuit to cause them to operate at low voltages. A booster circuit is provided for generating a power supply voltage VDDM, which is a boost voltage, to drive a memory circuit. Because the memory circuit can be operated at the same, high voltage and the other circuits can be operated at lower voltages than voltages that would be used in a case where the analog circuit, digital circuit, memory control circuit and memory circuit are driven by a common power supply, power consumption can be reduced.
November 8, 2001
Date of Patent:
February 25, 2003
Matsushita Electric Industrial Co., Ltd.
Abstract: A capacity changer device in which there is a first capacitor means of the 1-terminal capacitor type, and an enclosing hollow metal sphere enclosing the first capacitor means which may be spaced therefrom and being itself a 1-terminal capacitor with a current power supply for energizing a number of evacuated glass tubes containing an ionizable gas and forming part of the first capacitor means. It includes a second power suppy for direct current for charging the first capacitor means and connected also to the metal sphere for combining the charge to form a combination with the sphere of a change to a 2-terminal capacitor.