Matsushita Electric Industrial Co., Ltd.

Shinji Naka

Noboru Nomura

Satoshi Yamada

Joji Kane

Michio Sasaki

Takashi Deguchi

Hirotaka Ishihara

Morihiro Nakayama

Hiroyuki Unida

Akinori Yanase

Masahiro Kadono

Toshiakai Yagi

Katsuya Tanioka

Hirokazu Kaidou

An antenna apparatus having at least one radiating element. A second radiating element is located opposite a first radiating element. Earth is on the side opposite to the first radiating element with respect to the second radiating element thus opposite to the second radiating element. The second radiating element intervenes between the first radiating element and earth. Either the first or the second radiating element employs a feed terminal.

Antenna apparatus and communication system

A data drive type air conditioner control apparatus includes a main controller for controlling an air conditioner having a plurality of control modes and including an operation procedure memory for storing control operation procedures corresponding to the respective control modes of the air conditioner, and a control data memory for storing numerical data to be used for the control of the air conditioner and including a numerical data memory for initially storing numerical data to be used for controlling the drive of the air conditioner, such that the main controller drives the air conditioner in accordance with the numerical data stored in the control data memory.

Data drive type air conditioner control apparatus

In an inverter-drive controlling apparatus in accordance with a simulated sinusoidal wave non-uniform PWM system, data of one carrier period comprises data region of integer number, and at least one HALT region, and the carrier period T.sub.0 and data unit timer T.sub.2 are produced by frequency division from a common reference oscillator, and the frequency divisions to obtain the carrier period T.sub.0 and the data unit timer T.sub.2 are controlled individually from each other, thereby output frequency to the inverter and output voltage thereto can be desirably controlled in digital process; thereby even utilizing limited area for storing sinusoidal wave data, accurately simulated sinusoidal waveform and good characteristic of the voltage-frequency is attainable and completely synchronized switching of plural waveform data regions are obtainable, thereby enabling adjusting of the revolution speed of electric motor in extremely wide range and up to a very high speed, and the waveform becomes very good.

Inverter-drive controlling apparatus

Growing community of inventors

Moriyama, Japan

Shinji Naka