Prepaid watt-hour state of development

95 years ago, mainly for electric key IC card, IC card rewritable memory chip or general storage card, IC card storage, easy to use, cheap, security is not high, there is a possibility to crack the user to property community-based.
95 to 99 years, mainly for the telephone card IC card in the memory card and the logical  mcb circuit breaker  card-based security in which the logical encryption card has been further improved, in the memory chip embedded in an increase of the control logic outside, before accessing the storage area need to check passwords, only the password is correct, it

Can be operated. Users from simple residential property extends to the power industry management department, began to use the massive popularity
1998 - present, mainly for financial level IC card, the CPU card (CPU card and SAM module encrypted media) based CPU card embedded chip is equivalent to a special type of microcontroller, in addition with controller, memory, timing control logic endures, also with arithmetic unit and operating

Operating system,  electri cenergy meter , processing capacity, information storage security and other features. The first in the Beijing Power Supply Bureau to promote, and in Henan, Hunan and other cities began to promote.
Prepaid meter for the electricity sector and the meter reading charges brought great convenience and benefits, but also for manufacturers bring profits; as IC card prepaid meter  Electric transformer  should fully learn each of the cases brought to many thinking, positive self-reflection as a preventive measure

Actively eliminate the products in question, so that the enterprises themselves responsible for development of the industry responsible, socially responsible! Meter jointly safeguard the healthy development of the industry!