CN1199172A

CN1199172A - Semi-idleness prepaid watthour meter

Info

Publication number: CN1199172A
Application number: CN 97111304
Authority: CN
Inventors: 戴鹏辉
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-05-09
Filing date: 1997-05-09
Publication date: 1998-11-18

Abstract

A prepayment kilowatt-hour meter aimed at lowering cost and increasing reliability features that the prepayment kilowatt-hour value is stored in the memory of single-chip computer and low-order digits of counter that is divided into high-order and low-order digits. When the value of low-order digits becomes zero, it is necessary to pay, otherwise, the load is cut off by relay. The prepayment kilowatt-hour value is input to the meter by IC card.

Description

Semi-idleness prepaid watthour meter

Affiliated field: measurement instrument, watt-hour meter.

Reference technique: single-chip microcomputer is used; Electromechanical or electronic prepayment watt-hour meter.

Purpose: reduce the pre payment watthour meter cost, and improve its reliability.Content: semi-idleness prepaid watthour meter mainly contains gauge outfit, counter, single-chip microcomputer (comprising EEPROM), the IC-card seat, query key, display and to counter input pre-payment electric degree preset composition such as input media, as shown in drawings.The counter here is more special, and it is divided into two parts---a high position and low level, the whole wastage in bulk or weight electric degree that shows; Low level shows that the pre-payment electric degree of enter counter has consumed part, its complement (supposes that low level is 34.5, its complement then is 100-34.5=65.5) be the last value of pre-payment electric degree of enter counter, low level overflows when being zero relay will move the cut-out load, at this moment need to re-enter pre-payment electric degree (be input as certain value at every turn, spend 100 degree etc.) as 10 to counter, single-chip microcomputer will have or not the pre-payment electric degree according to internal memory, preset input or do not have the pre-payment electric degree to show.

Single-chip microcomputer is in the non-transformer idle condition in the ordinary course of things, and is only in running order in one of following situation:

1. import the pre-payment electric degree of purchasing by IC-card to internal memory.

2. when the counter low level is zero, preset input pre-payment electric degree to counter.

3. the last pre-payment electric degree of user inquiring single-chip microcomputer internal memory.

More than three kinds of states, the working time is very short, is generally in one minute, so total working time of single-chip microcomputer and peripheral circuit thereof is extremely short, single-chip microcomputer is disturbed and the possibility of makeing mistakes is very little; Its working time is short, and power consumption is low especially, so single-chip microcomputer can adopt battery to isolate fully with the load electrical network as power supply, the chance that allows single-chip microcomputer be disturbed is further dwindled, the reliability of whole like this table will improve greatly, and the anti-interference requirement of circuit simultaneously can reduce, thereby reduces cost.The responsible workload of single-chip microcomputer institute seldom also can reduce greatly the requirement of single-chip microcomputer and internal memory, thereby can continue to reduce cost in addition.

Counter and preset the importation and will increase cost, but increase part much smaller than reducing part, so whole telogenesis originally still can reduce greatly.

Compare with general prepayment meter: advantage has: cost is low; The reliability height.Shortcoming has: it is discontinuous enough to buy pre-payment electric degree electric degree, promptly can only purchase 10 degree or 100 degree and integral multiple electric degrees thereof; It is longer to preset input time.The former easily allows the people accept, and the latter runs into when having a power failure and will make mistakes, but probability is very little, as long as counter is not made mistakes, importing makes mistakes also can obtain artificial correction even preset.

Claims

Pre payment watthour meter table inside counting device can be deposited the pre-payment electric degree, and during operate as normal, the single-chip microcomputer most of the time is in off position.