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Jumping Drive Circuit and Internal Insulating Circuit for a Prepaid Kilowatt-hour Meter

IP.com Disclosure Number: IPCOM000191962D
Original Publication Date: 2010-Feb-12
Included in the Prior Art Database: 2010-Feb-12
Document File: 2 page(s) / 81K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

A metering MCB (Miniature Circuit Breaker) which is mainly applied in a prepay kilowatt-hour meter system usually uses a special circuit to realize its control function, and the implementation of mechanical and electronic isolations is essential to its safety. At the same time, to achieve reliable control with relatively few components and low cost for a metering MCB are increasingly challenging to designers. In one prior solution, when there is no card inserting into a kilowatt-hour meter of card-insert type, the contact will keep open and the signal wire will not have any control signals, and then the coil will be forced to release the MCB. In another solution, when the remote signal in a definite purpose circuit breaker for a prepaid watt-hour meter is available, the related transistors will correspondingly be open or closed to close the thyristor, and then the MCB will be closed. When the remote signal is off, the related transistors will correspondingly be open or closed to open the thyristor, and then the coil will be released to trip the MCB. In a third solution, if the remote signal in a RCD (Residual Current Device) for an Integrated Circuit (IC) card prepaid watt-hour meter is available, the transistor will be open and the thyristor will not be able to release the coil armature to trip the MCB. Otherwise, the special IC pin will output the high signal to force the thyristor to trip RCD. Additionally, the special IC pin can also detect the residual current from the coil to trip the RCD if the magnitude of the residual current is bigger than the preset value. All of these three solutions only use some transistors to realize the basic electric isolations, but none of them can insure the real physical isolation for its safety use in a kilowatt-hour meter system.

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Jumping Drive Circuit and Internal Insulating Circuit for a Prepaid Kilowatt- hour Meter

Idea: Zhang Yao Bao, CN-Shanghai; Tao Xiong, CN-Shanghai; Ai Jun Chai, CN-Shanghai; Hou Yu
Xiong, CN-Shanghai

A metering MCB (Miniature Circuit Breaker) which is mainly applied in a prepay kilowatt-hour meter system usually uses a special circuit to realize its control function, and the implementation of mechanical and electronic isolations is essential to its safety. At the same time, to achieve reliable control with relatively few components and low cost for a metering MCB are increasingly challenging to designers.

In one prior solution, when there is no card inserting into a kilowatt-hour meter of card-insert type, the contact will keep open and the signal wire will not have any control signals, and then the coil will be forced to release the MCB. In another solution, when the remote signal in a definite purpose circuit breaker for a prepaid watt-hour meter is available, the related transistors will correspondingly be open or closed to close the thyristor, and then the MCB will be closed. When the remote signal is off, the related transistors will correspondingly be open or closed to open the thyristor, and then the coil will be released to trip the MCB. In a third solution, if the remote signal in a RCD (Residual Current Device) for an Integrated Circuit (IC) card prepaid watt-hour meter is available, the transistor will be open and the thyristor will not be able to release the coil armature to trip the MCB. Otherwise, the special IC pin will output the high signal to force the thyristor to trip RCD. Additionally, the special IC pin can also detect the residual current from the coil to trip the RCD if the magnitude of the residual current is bigger than the preset value. All of these three solutions only use some transistors to realize the basic electric isolations, bu...