CN2174710Y - Electric card type prepaying electronic watt-hour meter - Google Patents

Abstract

The utility model relates to an electric card type payable electronic electricity meter. The utility model is composed of a sampling amplifying circuit, a V-F conversion circuit, a calculation controlling circuit, an electric card, a card socket circuit, a switch, a power down protection circuit, a casing, etc. The electricity can be realize that electric card is inserted in the electricity meter for using electricity after a user purchases the electricity with holding the electric card, and the utility model has the functions of metering in a time sharing method, electricity increase in a delay mode, over current protection, and start and stop through wireless remote control for energy storing type domestic equipment which use the electricity.

Description

Electric card type prepaying electronic watt-hour meter

In the present watt metering of China, use the mechanical type watt-hour meter always.This class table only possesses function of measuring, and has following several scarce limit, and the one, the metal material and the power consumption own that expend some are bigger, and the 2nd, to measure inaccurately, error at present commonly used is 2%, three, does not possess time-sharing measurement and forward purchasing electric weight function.In order to overcome these numbness diseases, domestic existing several units develop electron watt-hour meter, but these tables have only solved with electronic type and replace mechanical type, have saved nonferrous materials, have reduced power consumption own and have improved accuracy class.And unresolved forward purchasing electric weight and time-sharing measurement problem.Do not released the Electrical key watt-hour meter in the eighties abroad, solved the pre-payment problem, but it is mainly towards the industrial user, has only solved electricity charge prepayment, and unresolved time-sharing measurement and data passback problem, and involve great expense, be difficult to adapt to China's actual conditions.

The purpose of research electric card type pre-payment electronic electric meter, exactly in order to address the above problem, it is little that it has an oneself power consumption, and accurate measurement can time-sharing measurement and multiple advantage such as forward purchasing electric weight.

The utility model adopts a kind of new device " electricity card ", and (being the EEPROM card) as the media that carries out exchanges data between sale of electricity department and the user, this electricity card has the shape of card or key.The electric weight that sale of electricity department buys the user writes in the electricity card, after the user blocks electricity skewer and goes into the utility model, the electric weight of being bought imports in the table immediately, the user gets final product electricity consumption, when the user use this electric weight 90% the time send warning, the prompting user buys electric weight, disconnect user power supply when using zero, and the user must buy electric weight could continue electricity consumption.

The utility model is gathered the voltage U and the magnitude of current I of user power utilization, and it is carried out the V-F conversion, by calculating electric pulse, this pulse is used for drive stepping motor on the one hand and drives mechanical counter (register) degree of counting, convert digital quantity on the one hand to and compare, the break-make of control magnetic freeze mode two-position switch with the electric weight of purchasing.

The utility model has two kinds of formulas, and a kind of do not possess the time-sharing measurement function, adapts to general domestic lighting, a kind of have a time-sharing measurement function, is adapted to collective unit, has being divided into single-phase again and three equating types of time-sharing measurement function, but what of collection capacity just, other no big differences.

The electric card type pre-payment electronic electric meter logic diagram that does not possess the time-sharing measurement function is seen Fig. 1, and its circuit diagram is seen Fig. 3, and the electric card type pre-payment electronic electric meter logic diagram that possesses the time-sharing measurement function is seen Fig. 2, and its power supply reason figure sees Fig. 4.

Voltage sampling carries out the V-F conversion after adopting the direct dividing potential drop of precision resistance, rectification integration, becomes pulse.Current sampling adopts 0.1 Europe resistance, the rectification integration carried out the V-F conversion again after the magnitude of current become this faint voltage of voltage and carry out linear amplification, take out the phase place of the voltage and the magnitude of current simultaneously and carry out the V-F conversion again, above-mentioned three amounts are multiplied each other, promptly draw the charge value pulse and send into mechanical type register meter degree, this pulsed quantity carries out accumulated time and draws digital quantity, can carry out various processing such as timesharing storage to it.

The electricity card is made with eeprom chip, can be card form, and various profiles such as key are so that user's skewer pulls out and carries.Back-up source when power down protection provides power down, to guarantee that data are not lost, calibration interface is 232 interfaces; consistent with industry calibrated electronic formula reading with mechanical reading; single chip microcomputer is adopted in computing and control, adopts 87C751 during batch process, adopts 80C31 to add 27C64 during experimental production and forms.

Electric card type pre-payment electronic electric meter with time-sharing measurement function, only increase a hardware clock (seeing 58167 chips of Fig. 4) and LCDs (seeing the LCD frame of Fig. 4) (three-phase table have three overlap identical input end) software on the pre-payment electronic electric meter of time-sharing measurement function and distinguish to some extent not possessing, other principles are identical.

The utility model has the advantages that and adopt electric card mode, solved the problem of difficult charge in the past.In addition, because the function of time-division processing makes that more science is more reasonably collected the charges, this watt-hour meter can reduce function, and is functional strong, is user's best ideal product.

The components and parts that the utility model relates to allow to change with technical progress, but it constitutes essence and this case has been an equivalent effect.

Claims (5)

1, the utility model relates to a kind of measurement instrument of electric weight, is called electric card type pre-payment electronic electric meter, and it is adapted to carry out the various occasions of electric quantity metering; The utility model partly is made up of sampling amplification circuit, V-F translation circuit, arithmetic control circuit, electricity card and deck circuit, switch, power down protection circuit, shell etc.; it is characterized by: electric deck is connected with arithmetic control circuit; sampling amplification circuit and V-F conversion behind arithmetic control circuit, driving device register, liquid crystal display and switch.

2, by the described ammeter of claim 1, it is characterized by: electricity card deck is contained in the table body and is connected with control circuit.

3, by the described ammeter of claim 1, it is characterized by: switch adopts magnetic freeze mode two-position switch.

4, by the described ammeter of claim 1, it is characterized by: display device has comprised mechanical type register and LCDs.

5, by the described ammeter of claim 1, it is characterized by: the electricity card is to be constituted and made portable card or key shape by eeprom chip.

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