ELECTRONIC SINGLE-PHASE ACTIVE WATTHOUR METER WITH A PREPAYING IC CARD

摘要

THE ELECTRONIC SINGLE-PHASE ACTIVE WATTHOUR METER WITH A PREPAYING IC CARD ACCORDING TO THE PRESENT UTILITY MODEL IS COMPOSED OF A METER AND AN IC CARD (3) INSERTED INTO A IC CARD SLOT (4) OF THE METER. THE METER CIRCUIT INCLUDES A SAMPLING CIRCUIT (5), AN -APPLICATION SPECIAL INTEGRATED CIRCUIT (ASIC) (U1), PHOTOELECTRIC ISOLATING CIRCUITS (U2, U3 AND U4), A MICROPROCESSOR (US), A DATA MEMORY CIRCUIT (U6), A NIXIE 1UBE DISPLAY CIRCUIT (6), A SWITCH-CONTROLLING CIRCUIT (7) AND A SUPPLY CIRCUIT (8). IT IS CHARACTERIZED BY ITS MULTI-FUNCTIONS OF POWER CONSUMPTION CALCULATING, DISPLAYING, ANTI-INTERFERENCE OF POWER SUPPLY.THE WATTHOUR METER ACCORDING TO THE PRESENT UTILITY MODEL HAS ADVANTAGES OF REAL-TIME CHECK, HIGH RELIABILITY, STABILITY, LOW CONSUMPTION AND LOW COST.