Daikin Industries, Ltd.

Takashi Okano

Kouji Kamafusa

Hisatoshi Kawakami

Osamu Tanaka

Hiroshi Doumae

Masaya Nishimura

Hisashi Sumida

Kentaro Niki

Masaharu Sogabe

Kouji Uchida

Kouichiro Tamakoshi

Shuhei Kawamura

Provided is an air conditioner that suppresses power consumption by discharging resistors for discharging residual charges of a transmission path. An analog switch is previously interposed between two discharging resistors. In sending an AMI signal to two lines of a transmission path, an MCU executes discharge control to cause the analog switch to achieve an OFF state when a high level signal voltage is output, and to cause the analog switch to achieve an ON state when a low level signal voltage is output.

Air conditioner

A plurality of air conditioning units () are daisy-chain connected to each other by a switching hub () provided in an outdoor unit (). An integrated transmission line (A) and internal/external transmission lines (B) are connected to each other by a gateway () connected to the switching hub () so as to be capable of separating data transmission.

Transmission system for air conditioner

A receiving circuit includes a positive-side level judgment circuit, a negative-side level judgment circuit, and a gate circuit, and is configured to receive input of an AMI-coded signal, convert the signal to a binary output signal, and output the same. The positive-side level judgment circuit judges whether the voltage of an input signal is greater or less than a threshold on the positive side. The threshold on the positive side is provided with a hysteresis characteristic by a positive feedback. The negative-side level judgment circuit judges whether the voltage of an input signal is greater or less than a threshold on the negative side. The threshold on the negative side is provided with a hysteresis characteristic by a positive feedback loop. The gate circuit logically combines the outputs of the positive-side and negative-side level judgment circuits so as to generate the output signal.

Receiving circuit

The present invention is intended to efficiently implement noise countermeasures for a semiconductor circuit board and for a semiconductor circuit. The present invention is constituted by a control substrate, and a semiconductor circuit connected to the control substrate. The semiconductor circuit includes a substrate, an integrated circuit group, and a noise countermeasure, and is separated from the control substrate. The integrated circuit group includes an integrated circuit as a noise source. The substrate has a stacked multilayer structure, and shifts the frequency of a noise generated by the integrated circuit group to the high frequency side. The noise countermeasure is connected between the integrated circuit group and the control substrate. The noise countermeasure is a filter for attenuating the high frequency of a noise.

Semiconductor circuit board and semiconductor circuit

One end of a power-supply bus is connected to a power supply through a ferrite bead. The power-supply bus is connected to power-supply terminals. The power-supply terminals are connected at positions in such a manner that a terminal with a higher intensity is connected closer to the other end of the power-supply bus. Ground terminals are connected to ground. Capacitors are bypass capacitors or decoupling capacitors, for example, and connected between respective power-supply terminals and ground.

Device and connecting method for connecting power-supply terminals to a power-supply bus based on noise intensities

This invention relates to a rotational speed control system including a plurality of motor drivers for driving motors, and the object thereof is to drive a plurality of motors at the same rotational speed without depending on the number of motor drivers and without depending on the characteristics of each motor driver. A remote controllerand a motor driverare connected to a motor driver. The motor driversandcontrol motors Mand Mat a prescribed rotational speed, respectively. A rotational speed instructing signalindicative of the rotational speed is supplied from the remote controllerto the motor driver, and further supplied from the motor driverto the motor driver. Because the rotational speed instructing signalindicates a rotational speed which is transmitted in a digital value between the motor driversand, both of the motors Mand Mare driven at the rotational speed indicated by the rotational speed instructing signal

Rotational speed control system, rotatingly driving system, air blow system, clean bench, outdoor unit of air conditioner

A set back timer for an air conditioner is provided with a display screen ( ) for the representation of information about normal and set back operations of the air conditioner, wherein a normal operation time period display ( ) indicating a time period of the day during which period a normal operation is carried out and a set back time period display ( ) indicating a time period in the normal operation time period during which period a set back operation is carried out are displayed independently of each other on the display screen ( ). Such arrangement enables an air conditioner user to easily and correctly confirm, at a glance, the relationship between a normal operation time period and a set back operation time period in the normal operation time period for the day, and the contents of a setting can be confirmed remarkably easily, thereby contributing to improvements in air conditioner operability.

Growing community of inventors

Osaka, Japan

Takashi Okano