The Sensor Control Module Contactless of Instant Electric Water Heater

• Main Author: 王佩瑛
• Other Authors: 阮昱霖 博士
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/00207537024064029425

碩士 === 國立彰化師範大學 === 電機工程學系 === 101 === With the industry development, the application of water heating is progressed from firewood to natural gas and electricity as heating sources. Because of the feature of fast heating and high efficiency, electronic heater is widely utilized in household to improve the living convenience. However, the temperature of tankless water heater cannot be changed with minor adjustment, which has been compensated by digital thermostat water heater in literature. Also, traditional metal contacting, utilized to control the signal of temperature, might cause electric leakage and rusted metal. Therefore, a sensor control module is proposed in this study to avoid above shortages and reach the purpose of contactless control through ultrared ray sensor. The system of sensor control module for instaneous water heater is to control water temperature without touching the water heater. In the system, a microprocessor control unit is utilized to control the relay and then adjust the heating condition of contactless sensor. The experiment applies reflective sensor of ultrared rays to be the temperature controller with an operating frequency between 2 kHz to 5 kHz. The signal is evaluated as effective while the sensing period is more than 30 ms. The result proves the proposed system achieves the function of contactless temperature control and the advantage of maintenance-free to extend product life.