Noritz Corporation

Noritz Electronics Technology Corporation Inc.

Tomoki Kishimoto

Akira Ohta

Shinichi Okamoto

Yoshifumi Atobe

Yoshihisa Kitano

Daisuke Konishi

Masahiro Mori

Masanori Kubotani

Yasuhide Ikeuchi

Tomoya Nakano

Yuji Takagi

Masayoshi Yasukawa

Ryo Ikeda

Haruki Inoue

Akira Takabayashi

Hiroshi Yakoyama

Yoshitaka Kimura

Takashi Yashima

A combustion device includes: a gas proportional valve; a control portion; a driving circuit; and a monitoring circuit. The monitoring circuit includes: a voltage generating portion configured to generate monitoring voltages corresponding to a driving current; and a branch output portion configured to output the monitoring voltages to a plurality of terminals of the control portion. When a voltage difference between the monitoring voltages input to the plurality of terminals is a determination reference value or more, the control portion determines that there is a failure of the monitoring circuit. When the voltage difference between the monitoring voltages is less than the determination reference value, and at least one of the monitoring voltages does not fall within a predetermined normal range while the gas proportional valve is controlled to become a predetermined state, the control portion determines that there is the failure of the monitoring circuit.

Combustion device

A solenoid valve driving apparatus includes switching means for ON/OFF-controlling application of a direct current voltage to a solenoid of a solenoid valve, and signal outputting means. A first period and a consecutive second period are set as a valve opening operation period of the solenoid valve. When the signal outputting means outputs the PWM signal to the switching means, a duty ratio of the output signal is set to be higher in the second period than in the first period so that a power supplied to the solenoid is larger in the second period than in the first period. As a result, a valve opening operation is performed in the solenoid valve reliably, and loud noise generation during the valve opening operation is suppressed.

Driving method for solenoid valve, solenoid valve driving apparatus, and combustion apparatus including same

The present invention relates to a combustion control device incorporated in an apparatus such as water heater and provides the combustion control device having an improved configuration with a main controller and a sub controller, capable of employing a microcomputer with lower capability as the sub controller, and ensuring higher safety than ever before. Signals indicating a combustion state of a combustion apparatus are inputted into the main controllerand the sub controllerin parallel. Upon fulfillment of a predetermined condition of stopping, the main and sub controllersandeach output a stop signal to cut off a current to be supplied to a device driving circuit. The conditions of stopping in outputting of the stop signal by the main and sub controllers are such that the sub controlleris less apt to execute the cutoff than the main controller

Combustion control device

Growing community of inventors

Hyogo, Japan

Tomoki Kishimoto