Panasonic

About: Panasonic is a company organization based out in Kadoma, Ôsaka, Japan. It is known for research contribution in the topics: Signal & Layer (electronics). The organization has 49129 authors who have published 71118 publications receiving 942756 citations. The organization is also known as: Panasonikku Kabushiki-gaisha & Panasonic.

Radio communication apparatus and pilot symbol transmission method

Abstract: A radio communication apparatus is disclosed that enables the influence of the feedback information on the channel capacity to be kept to the minimum without reducing the transmission efficiency of information by transmission of pilot symbol. In the apparatus, a delay dispersion measuring section (272) generates a delay profile using the received signal, and measures delay dispersion indicative of dispersion of delayed versions. A moving speed estimating section (274) estimates moving speed of a mobile station apparatus that transmits a pilot symbol based on the variation in reception power of the pilot symbol. An other-cell interference measuring section (276) measures other-cell interference caused by signals transmitted in cells except the cell to which the apparatus belongs. Corresponding to the delay dispersion, moving speed and other-cell interference, a pilot pattern information generating section (278) selects a pilot pattern such that placement of pilot symbol is optimal in a frame, and generates the pilot pattern information.

Metallized film capacitor

Abstract: A metallized film capacitor has a slit (5a) almost at the center, in a width (W) direction, of an effective electrode portion contributing to the capacity formation of a pair of vapor-deposition electrodes (110, 210), and is provided, on the sides extending toward insulation margins (4a, 4b) from the center, with split electrodes (2a, 2b) connected in parallel by fuses (7a, 7b), whereby such a construction as having fuses located away from metallikons (6a, 6b) can reduce the values of currents supplied from meallikons and passing through the fuses to thereby reduce heating by the fuses and restrict the temperature rise of the metallized film capacitor.

99.3% Efficiency of three-phase inverter for motor drive using GaN-based Gate Injection Transistors

Abstract: In this paper, we present a successful operation of Gallium Nitride(GaN)-based three-phase inverter with high efficiency of 99.3% for driving motor at 900W under the carrier frequency of 6kHz. This efficiency well exceeds the value by IGBT (Insulated Gate Bipolar Transistor). This demonstrates that GaN has a great potential for power switching application competing with SiC. Fully reduced on-state resistance in a new normally-off GaN transistor called Gate Injection Transistor (GIT) greatly helps to increase the efficiency. In addition, use of the bidirectional operation of the lateral and compact GITs with synchronous gate driving, the inverter is operated free from fly-wheel diodes which have been connected in parallel with IGBTs in a conventional inverter system.

Metal detection method, metal detection device, metal detection method for wireless power supply device, and wireless power supply device

Abstract: Provided are a metal detection method, a metal detection device, a metal detection method for a wireless power supply device, and a wireless power supply device which are capable of accurately detecting whether an object is a metal or a nonmetal. An oscillation circuit (10) oscillates and produces a sine wave having a single fundamental frequency, and excites a metal detection coil (Ls) by the oscillation current (It) of the sine wave. An electromagnetic wave of the sine wave having the single fundamental frequency is radiated from the metal detection coil (Ls). A high-pass filter circuit (11a) receives the oscillation current (It), removes the fundamental frequency component from the oscillation current (It), and extracts a high-harmonic component of the fundamental frequency. A comparison circuit (12) determines the presence or absence of a metal.