The Design And Implementation Of IC Card Heat Meter

In economy-developed countries, residential heat meters have gained quit wide application.Heat meter, as the metering basis for collecting fees between heat supply companies and heat users , not only has been widely accepted by users, but also has performed a distinct function in economizing energy. As faras our reforming and opening country is concerned, according to international convention, heat-supplying charging by meter is imperative. Metering by heat meters is only a method, while realizing reasonable charging is our purpose.Fu-rthermore, the use of prepayment heat meters is the certain trend for heat system reform. Despite many kinds of heat meters available in current market,thereare different problems, more or less, in them.After making researches on the scientific methods of heat metering, we first use the latest components and the comparatively advanced electronic technology, and then synthetically use many technique methods from different aspects of software and hardware, and finally make an elaborate design, which extremely reduces the efficiency cost of the meter, promotes the measuring precision of the meter, and makes it have more reliability. On the other hand, the scientific nature of metering the heat used provides an accurate basis for collecting fees between heating users and heat supply companies; possessing the prepayment function essentially solves the difficult problem that heat supply companies collect heating fees.In the meanwhile, in view of the situation that the majority of the heat meters on the market haven't solved the data security problem perfectly, we make a deep investigation from the password security of the IC card, encrypting and checking the data on the IC card, and several other topics. We then provide a novel comprehensive data security design scheme that characterized by "one password per card, data encrypting, and two-way recognizing". This scheme, simple and practical, safe and reliable, is able to effectively avoid the attacks on system data, and provide a new idea for the IC card prepayment meters.