CN2331975Y

CN2331975Y - Dual-purpose prepayment electric energy meter for double fee rate and single fee rate

Info

Publication number: CN2331975Y
Application number: CN 98231172
Authority: CN
Inventors: 肖建如; 宋其新; 万步炎; 丁一鸣
Original assignee: Changsha Institute of Mining Research Co Ltd
Current assignee: Changsha Institute of Mining Research Co Ltd
Priority date: 1998-08-10
Filing date: 1998-08-10
Publication date: 1999-08-04
Anticipated expiration: 2008-08-10

Abstract

The prepayment electric energy meter for both double-purpose of double-rate and single-rate consists of the existing common inductive electric energy meter 1 and the newly designed control meters 2 to 13, the control meters are based on a single chip microcomputer, are matched with proper hardware and software, utilize IC card as the medium for transmitting power supply data, before the user uses electricity, buy the IC card to the power supply department, insert the card into the control meter and supply power. The meter can automatically measure, process and control the electricity consumption according to the multi-rate or single rate (i.e. ordinary rate), thus saving the complicated procedure of charging by manual meter reading and also implementing the limited plan management for the areas with short power supply. The device has high precision, reliable work and low manufacturing cost.

Description

Multiple rate and the dual-purpose prepayment meter of single rate

The utility model relates to a kind of tariff meter of measuring the special use of power consumption, also belongs to a kind of design that is suitable for the machine element of distribution network, specifically is meant a kind of multiple rate and the dual-purpose prepayment meter of single rate.

At present no matter industry or civilian electric energy meter, it all is first electricity consumption, regularly checked meter and charged by power supply department in the back, do not only formality trouble like this, need to drop into great amount of manpower, and the income of the electricity charge lags behind the input of power supply, even also has the phenomenon of owing electricity charges sometimes, along with the deep development of market economy reform, power supply department presses for pay the fees the earlier way to manage of back electricity consumption of implementation, to quicken the withdrawal of currency from circulation of fund.In addition, along with the rapid raising of social productive forces and living standards of the people, the growth of power supply capacity has been difficult to catch up with increasing rapidly of power consumption.A kind of method that solves this imbalance between supply and demand is to carry out multiple rate accounting system, to stabilize the peak electricity consumption, accomplishes balanced electricity consumption as far as possible, improves the power supplying efficiency of existing generating set.

This actual needs according to society, the purpose of this utility model, but be to provide a kind of to need not manual metering and must pay the electricity charge just multiple rate and the dual-purpose prepayment meter of single rate of finite quantity electricity consumption earlier, make of the charging of this electric energy meter to power consumption, both can adopt multiple rate system (promptly the regular making software of formulating by power supply department carries out data processing), also can be single rate accounting by existing common rate.

Because the domestic electric energy meter overwhelming majority all is to adopt induction type electric energy meter at present, this electric energy meter also can not be passed into disuse in the quite a long time, therefore, design philosophy of the present utility model, be the Based Intelligent Control table of core by installing one additional with the microcomputer exactly, existing induction type electric energy meter be transformed into IC-card as pre-payment purchase electric weight the transmission media, use the intelligent electric energy meter of electric control according to multiple rate or common rate, to satisfy social actual needs.

Referring to the utility model shown in Figure 1 electricity functional-block diagram and the sampling rotating disk of the present utility model and the attaching synoptic diagram of Photoelectric infrared switch shown in Figure 2, this design proposal of answering rate and the dual-purpose prepayment meter of single rate is as follows.It is combined by existing common induction type electric energy meter 1 and newly-designed control table 2 to 13 two large divisions, evenly coat a bit of pitch-dark or stick a bit of black Pressure sensitive adhesive tape and form sampling rotating disk 11 at the edge of the rotating disk of common induction type electric energy meter 1, two mutually close reflective Photoelectric infrared switches 12 and 13 in edge with sampling rotating disk 11 are installed on the frame of common induction type electric energy meter 1, and make length pitch-dark or the black Pressure sensitive adhesive tape be a bit larger tham spacing distance between two optoelectronic switches 12 and 13, Photoelectric infrared switch 12 and 13 combines with sampling rotating disk 11, the electric power analog-signal transitions that common induction type electric energy meter 1 is measured becomes pulse digital signal, Photoelectric infrared switch 12 follows the input end of power consumption sampling processing circuit 4 to link to each other respectively with 13 signal output part, send the sampling processing circuit 4 of electricity consumption to handle pulse digital signal, the signal after the processing flows to the one-chip computer circuit 3 that links to each other with power consumption sampling processing circuit 4 output terminals again and handles; Be loaded with in the IC-card seat that effective IC-card 10 of purchasing electric weight and code data is plugged on IC-card read/write circuit 6, IC-card read/write circuit 6 combines with the one-chip computer circuit 3 that is connected, finish the read-write operation to IC-card, one-chip computer 3 outsides connect with real time clock circuit 7A and Serial E ²PROM memory circuit 7B (7A and the 7B use of can not pegging graft simultaneously, when promptly working can only alternatively), one-chip computer circuit 3 outsides also are connected with power cut detection circuit 5; After the signal of 3 pairs of inputs of one-chip computer circuit is handled, the digital display circuit 9 that connects outside shows related content, and output signal to continuous power-supplying circuit 8, the power supply of the common induction type electric energy meter 1 that is attached thereto by power-supplying circuit 8 control, system power supply 2 provides working power for the power end of The whole control watch circuit 3 to 9 from output terminal E.

In above-mentioned design proposal, use two Photoelectric infrared switches 12 and 13 simultaneously, be in order to improve reliability on the one hand to the power consumption sampling, also be on the other hand for prevent the user with the incoming line of AC power with the output line reversal connection so that 11 reversings of sampling rotating disk and stealing (when the identical power consumption, 11 reversings of sampling rotating disk are than just changeing slow a lot).The power consumption sampling principle is as follows: when user power utilization, sampling rotating disk 11 rotates, when the pitch-dark or black Pressure sensitive adhesive tape on the rotating disk 11 does not forward the reach of Photoelectric infrared switch 12 as yet to, the infrared ray of infrared transmitting tube in the Photoelectric infrared switch 12 emission reflexes to infrared phototriode in the Photoelectric infrared switch 12 through sampling rotating disk 11, make infrared phototriode be in conducting state, when the pitch-dark or black Pressure sensitive adhesive tape on the rotating disk 11 turns to the reach of Photoelectric infrared switch 12, the infrared light that Photoelectric infrared switch 12 sends is absorbed by the pitch-dark or black Pressure sensitive adhesive tape on the rotating disk 11, infrared phototriode in the Photoelectric infrared switch 12 does not receive infrared light and becomes cut-off state, the pulse signal that this state variation produced is after 4 shapings of power consumption sampling processing circuit, be input to an I/O port of one-chip computer circuit 3 (hereinafter to be referred as CPU), receive by the CPU sampling.The action principle of Photoelectric infrared switch 13 is identical with Photoelectric infrared switch 12.Because the length of the pitch-dark or black Pressure sensitive adhesive tape on the rotating disk 11 is greater than the distance between Photoelectric infrared switch 12 and the Photoelectric infrared switch 13, therefore have only the phototriode in optoelectronic switch 12 to occur earlier ending, and under the state of remain off, phototriode in the optoelectronic switch 13 also becomes and ends, and when the pitch-dark or black Pressure sensitive adhesive tape on the rotating disk 11 leaves optoelectronic switch 12 and 13, phototriode in the optoelectronic switch 12 becomes conducting earlier, phototriode in the optoelectronic switch 13 is just conducting subsequently, rotating disk 11 so just is described for just changeing, CPU just is used as this variation of these two input signals once normal dial rotation number and receives.When causing rotating disk 11 reversings because of AC power cord reversal connection stealing, then situation antithesis, the phototriode of optoelectronic switch 13 becomes earlier and ends, the phototriode of optoelectronic switch 12 just becomes and ends then, and the pitch-dark or black Pressure sensitive adhesive tape on the rotating disk 11 leaves optoelectronic switch 13 and at 12 o'clock, the phototriode of optoelectronic switch 13 is earlier by after becoming conducting, and the phototriode of optoelectronic switch 12 is also just by by becoming conducting, and CPU changes the sort signal that receives and is considered as reversing stealing.As seen from the above analysis, the pulses of Photoelectric infrared switch 12 and 13 outputs are should have correct sequential relationship the time, and it is normal to think that just sampling rotating disk 11 rotates, otherwise think that sampling rotating disk 11 reverses stealings.When continuous appearance is reversed for several times (for example 3 times), CPU just can be sure of it is the reversing stealing, i.e. the power supply cut off the user of may command power-supplying circuit 8, and on digital display circuit 9, show.When sampling rotating disk 11 rotated, what CPU received only was the state variation that a road in optoelectronic switch 12 or 13 produce, and occurred (for example 3 times) for several times continuously, and CPU promptly is judged as an optoelectronic switch and related circuit damages.CPU is except that receiving the rotation number of this signal as the sampling rotating disk, also on digital display circuit 9, make alarm indication simultaneously, remind the user notification power supply department to keep in repair, otherwise after the user continues to use a certain amount of electric energy (for example 10 degree), also will control power-supplying circuit 8 and cut off power supply, after power supply department keeps in repair, just continue power supply.Owing to the possibilities that two Photoelectric infrared switches 12 and 13 damage simultaneously are less.Therefore adopting two infrared switches to concern by certain time sequence gathers power consumption, both can improve the reliability of sample circuit, can prevent user's " reversing " stealing again.

In Fig. 1 design proposal, real time clock circuit 7A of the present utility model makes a real time clock module, lithium battery is arranged as standby power supply in the module, after the initial value of real time clock is used the specialized equipment one-time write by factory, real time clock can begin independent timing, and can adjust year automatically, month, day, the time, divide and the leap year timing, when real time clock module 7A inserts main circuit board of the present utility model by connector, CPU can obtain correct time by the read-write operation to real time clock, and according to the rule of multiple rate accounting system to the peak of user in electricity consumption, flat, the power consumption of paddy period carries out data processing, and is shown by digital display circuit 9.The peak of multiple rate, flat, paddy period are set by special-purpose IC-card.Real time clock adopts modular structure and is used the mode of the initial value of the disposable input real time clock of specialized equipment by factory, usually the every table that adopts compared with present multi-rate meter all is provided with the method that input button isochronon primary data input circuit is provided with the real time clock initial value, more economical, easy, reliable, and can not change by the user.

Because the still unexecuted multiple rate system of the power supplies in China's overwhelming majority area at present, also have practicality for making the utility model when the unexecuted multiple rate system, the utility model also adds Serial E in design proposal shown in Figure 1 ²PROM memory circuit 7B, this circuit links to each other with the CPU respective pins by the integrated circuit socket that is installed on the main printed circuit board.When not carrying out multiple rate system, do not patch real time clock module 7A and insert Serial E ²PROM memory circuit 7B, 7A and 7B can only select one, but can not use simultaneously, the main effect of 7B is to be used for preserving data necessary when having a power failure.Depositing the data whether sign carries out multiple rate system at the specific memory cell of 7A and 7B, CPU is by the read-write of flag data that this specific memory cell is deposited, that can judge that the utility model patches is 7A or 7B, thereby learns it is to adopt multiple rate system or common rate system to carry out metering data to handle.

The utility model with foregoing circuit structure in use, the user must buy the effective IC-card 10 that has write password and purchased electric amount of money certificate to power supply department earlier, with the IC-card seat CZ1 in effective IC-card 10 insertion IC-card read/write circuits 6, after CPU receives the plug-in card signal, whether the password of at first proofreading on the IC-card is correct, as correctly then read on the card purchase electric data after, with IC-card clear " 0 ", and on digital display circuit 9, show the read-write card end signal, the user can extract IC-card, after this digital display circuit 9 will show existingly purchases electric data, and controls power-supplying circuit 8 simultaneously and begin the power supply for the user.Used IC-card, the user should preserve properly, reclaims in order to power supply department and uses.If password bad, CPU do not receive data, to user power supply and on digital display circuit 9, do corresponding demonstration.When user power utilization, the power consumption sampling processing circuit 4 signal input CPU that rotating disk 11 rotates that will sample, the CPU basis is the period of real time clock circuit 7A at that time, carry out data processing when patching 7B (as only carry out data processing) by multiple rate rule by common rate, gradually the purchasing electricity charge are deducted the corresponding electricity charge of power consumption, and on digital display circuit 9, show the residue electricity charge.When the residue electricity charge reduced to zero, CPU control power-supplying circuit 8 cut off power supply, inserts effective IC-card again until the user.As remain the electricity charge and reduced to before zero, the user just inserts effective IC-card, and then CPU will newly purchase the electricity charge automatically and add the residue electricity charge and show on digital display circuit 9.

When having a power failure, power cut detection circuit 5 is imported CPU with power cut signal, and the data that CPU in time will protect are sent to the RAM among the real time clock circuit 7A or are sent to Serial E ²PROM memory circuit 7B is temporary.After waiting to restore electricity, CPU will be temporarily stored in the data retrieval among 7A or the 7B, restart normal running.

The utility model utilization micro-computer technology, common induction type electric energy meter and IC-card Based Intelligent Control table are combined, both can also can measure and realize Based Intelligent Control and management to user's electricity consumption and electric energy by multiple rate by common rate (single rate), this has just saved numerous and diverse formality of charging by manual metering at present, and can carry out the planning management of the power supply of limiting the quantity of to the area of power shortage by the distribution IC-card.Adopt multiple rate accounting system can stabilize " high honeybee " electricity consumption, encourage " low ebb " electricity consumption, help accomplishing balanced electricity consumption, to improve the efficient of generating set.Carry out the way to manage of charge back electricity consumption earlier, make electric energy really become commodity, guaranteed the economic benefit of power supply department.Owing to adopt one-chip computer and integrated component, and make the real time clock circuit modularization and use self-control specialized equipment one-time write clock initial value, thereby saved the keyboard equal time data input circuit of input real time clock initial value, and making the user arbitrarily not change the time period, high precision, high reliability, the antijamming capability that therefore can try to achieve product is strong, compact conformation and good effect with low cost.

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1 is an electric functional-block diagram of the present utility model;

Fig. 2 is the attaching synoptic diagram of sampling rotating disk of the present utility model and Photoelectric infrared switch;

Fig. 3 is the embodiment of a kind of physical circuit of control table 2 to 13 among Fig. 1.

Referring to Fig. 2, Yin Putong induction type electric energy meter 1 is a prior art, thus its structure omit, only draw in the drawings the sampling rotating disk that is connected mutually with control table 2 to 13 11 this part.Edge at the rotating disk of common induction type electric energy meter 1, evenly coat a bit of pitch-dark or stick a bit of black Pressure sensitive adhesive tape 14 and form sampling rotating disk 11, support member 15 is connected on the frame 16 of common induction type electric energy meter 1, two mutually close reflective Photoelectric

infrared switches

12 and 13 in edge with sampling rotating disk 11 are installed on support member 15 again, and are made length pitch-dark or black Pressure sensitive adhesive tape 14 be a bit larger tham spacing distance between two

optoelectronic switches

12 and 13.

Referring to Fig. 3 and Fig. 1, system power supply 2 comprises the electromagnetic interface filter of being made up of inductance L 1 and L2, capacitor C 1 to C3 and fuse tube F1, the current rectifying and wave filtering circuit of forming by transformer B1, rectifier bridge Q1 and capacitor C 4 and C5, by the DC-stabilized circuit that three end integrated stable voltage circuit U4 and capacitor C 6 and C7 form, system power supply 2 anodes are exported from UCC.U4 can adopt LM7805.

Referring to Fig. 3 and Fig. 1, one-chip computer circuit 3 is made up of one-chip computer U1, resistance R 2 and capacitor C 8, it is the one-chip computer of PIC16C57 that U1 adopts model, this single-chip microcomputer fast operation, function driving force strong, low in energy consumption, the I/O interface are big, peripheral circuit is very simple, only needs to form the RC clock oscillation circuit by R2 and C8 and gets final product as the clock of U1.

Referring to Fig. 3 and Fig. 1, power consumption sampling processing circuit 4 is made up of a slice single supply double operational integrated circuit U5 and resistance R 8 to R17, R8 and R13 be respectively reflective Photoelectric infrared switch GK1 and GK2 (be Fig. 1 with Fig. 2 in 12 and 13) in the collector load resistor that infrared transmitting tube was connected, R9 and R14 are respectively the collector load resistor that infrared receiving tube was connected among GK1 and the GK2.Two operational amplifier U5:A of U5 and U5:B respectively form a positive feedback hysteresis comparator, and positive feedback resistor is respectively R11 and R17, and the reference voltage of comparer is provided by the resitstance voltage divider that resistance R 10 and R12 and R15 and R16 form respectively.The positive feedback hysteresis comparator that U5 forms is input to two I/O ports of U1 then with the sampling pulse signal shaping of two reflective Photoelectric infrared switches, carries out power consumption signal for U1 and handles operation.The model of U5 can adopt LM358.

Referring to Fig. 3 and Fig. 1, power cut detection circuit 5 is made of economical reseting circuit U3, and the output terminal of U3 is connected to the I/O port of U1, the output terminal of the input end welding system power supply 2 of U3.When AC power just often, the voltage of D.C. regulated power supply is higher than the action threshold values of U3, U3 exports high level; If when having a power failure, when the output voltage of stabilized voltage supply was brought down below the action threshold values of U3, the U3 output low level after U1 receives this low level signal, was carried out the power failure handling procedure immediately, preserve data necessary.U3 can adopt AN051.

Referring to Fig. 3 and Fig. 1, IC-card read/write circuit 6 mainly is made of IC-card seat CZ1.CZ1 is commercially available existing product, needs only the corresponding I/O port and the power supply that each relevant contact of IC-card seat CZ1 are connected to U1, can form the IC-card read/write circuit.When plug-in card not, normally closed (or the often opening) contact 9 of IC-card seat CZ1 and 10 closures (or disconnection), the corresponding I/O port of U1 is input as low level (or being high level); When plug-in card, IC-card will make normally closed (or the often opening)

contact

9 and 10 of deck CZ1 disconnect (or closed), the corresponding I/O port input becoming of U1 high level (or low level), U1 receives this signal, just known that IC-card inserts, promptly carried out the read-write card subroutine, finished read-write operation IC-card.

Referring to Fig. 3 and Fig. 1, real time clock circuit 7A forms a module by serial real time clock integrated circuit U2, crystal oscillator OC1, standby lithium battery BAT and diode D2 and D3, is connected through corresponding I/O port of connector P1 to P5 and U1 and system power supply.OC1 provides the reference clock oscillation source for U2, and D2 and D3 are isolating diode, and standby lithium battery BAT and D.C. regulated power supply are isolated.When normal power supply, stabilized voltage supply Ucc is greater than BAT voltage, the D3 forward bias, and the D2 reverse bias is only powered to U2 by Ucc; When having a power failure, BAT voltage is greater than Ucc voltage, the D2 forward bias, and the D3 reverse bias is powered to U2 by BAT.The model of U2 can adopt DS1302, and it can correct timing after by the initial value of self-control specialized equipment write time, and adjust automatically second, branch, the time, day, the moon, year (comprising the automatic adjustment in leap year), its time value can be read and write by U1.Deposit data when the RAM of 32 bytes is for power failure in addition in the U2.This modular structure can be worked real time clock circuit alone, also can insert main printed circuit board arbitrarily and provide the real-time time data for U1.Therefore needn't be as the multi-rate meter of present use, each ammeter all adds button equal time data input circuit, so that to real time clock circuit initial value is set.Therefore, structure of the present utility model is more simple, practical and reliable, and has reduced cost.

Referring to Fig. 3 and Fig. 1, Serial E ²PROM memory circuit 7B is made up of data memory U6 and corresponding integrated circuit socket, the respective pins of the input end of clock CLK of U6 (the 6th pin) and serial data I/O end SDA (the 5th pin) and the real time clock integrated package U2 of real time clock circuit 7A links together and is connected to two the I/O ports of U1 in the one-chip computer circuit 3, so U6 and real time clock module 7A can not insert simultaneously.When not carrying out multiple Fei Zhishi, pull up real time clock module 7A, insert U6, in the specific memory cell of U6 and U2, respectively deposit the data that indicate common rate system and multiple rate system respectively of a byte, when powering on, U1 carries out read operation to these two specific memory cells, analyzes according to the data that receive, can learn it is to carry out common rate charging or multiple rate accounting, handle thereby carry out corresponding metering data.If that peg graft is 7B, when having a power failure, U1 deposits the data that must protect in U6, and when restoring electricity, U1 is again with the data retrieval of preserving in the U6.Except metering data processing mode difference, be essentially identical when all the other working methods and insertion real time clock module 7A.The model of U6 can adopt 24C01.

Referring to Fig. 3 and Fig. 1, power-supplying circuit 8 is made up of triode T1, resistance R 1, diode D1, relay J 1 and voltage dependent resistor (VDR) MY1, the I/O port (as RAO) of the end of R1 and U1 joins, the normally closed contact of J1 is serially connected between the current coil of AC power end of incoming cables and common induction type electric energy meter 1, and MY1 is attempted by on the normally closed contact of J1.R1 is the base electrode bias resistance of T1, and T1 is connected into the common emitter working method and plays amplification, is used for driving relay J 1.When the RAO of U1 port output low level, the T1 conducting, J1 gets electric adhesive, and normally closed contact NC disconnects, and stops the power supply for the user; When the RAO of U1 port output high level, T1 ends, and the J1 dead electricity discharges, and normally closed contact NC closure begins the power supply for the user.D1 is the fly-wheel diode of J1 coil, plays protection T1.MY1 then plays arc extinguishing and protection contact when the normally closed contact NC of J1 disconnects.

Referring to Fig. 3 and Fig. 1, digital display circuit 9 is total to anode charactron W1 to W4, triode T2 to T5 by four and resistance R 3 to R7 is formed, R3 to R7 joins with 12 I/O ports of U1 respectively and logarithmic code display circuit 9 is controlled, and adopts dynamic scan mode to show various data and symbol.Wherein T2 to T5 is the position driving triode of charactron W1 to W4, and by four I/O port controlling of U1, the position drives effectively during low level.R4 to R7 is respectively the base electrode bias resistance of T2 to T5.R3 is that the section of digital display tube W1 to W4 drives current-limiting resistance, and segment encode is directly exported by 8 I/O ports of U1.Wherein the PGM signal port of the deck CZ1 of the output I/O port of radix point and IC-card read/write circuit 6 is multiplexing.

Each several part circuit of the present utility model is worked under the control of CPU (being U1 among Fig. 3), when the user inserts the deck CZ1 of IC-card read/write circuit 6 with IC-card, the normally closed

contact

9,10 of CZ1 disconnects, after the corresponding I/O termination of CPU is received a high level signal, CPU promptly carries out the read-write card subroutine, after verifying that earlier password is correct, just the electric data of purchasing on effective IC-card are read into the CPU internal RAM and stored, and the electric data zero clearing of purchasing on the IC-card, show the symbol that read-write card is finished on display circuit 9, this moment, the user can extract IC-card.After IC-card was extracted, display circuit 9 showed the electric data of purchasing that receive at once.If the user extracted IC-card before CPU finishes the IC-card zero clearing, the data of then originally reading in are invalid, so just guarantee that the electric data of purchasing on every effective IC-card can only be by the CPU reception once.If password bad, CPU will not receive the data on the IC-card, and show wrong card symbol on digital display circuit 9.

CPU received purchase electric data after, make its corresponding I/O port (as RAO) output high level, triode T1 is ended, relay J 1 dead electricity, then the normally closed contact NC of J1 connects, and can power to the user.

The sampling rotating disk 11 of common induction type electric energy meter 1 rotates when user power utilization, whenever turn around, reflective photoelectric switch GK1 that sampling processing circuit 4 input ends of electricity consumption are connected and the collector of GK2 will be exported a pulse signal separately, after the U5 shaping, be input to two I/O ports of CPU respectively, as previously mentioned, the sequential relationship that CPU occurs according to two pulse signals, judge that sampling rotating disk 11 is forward or reverse, as just changeing, the period at that time that then receives this signal and read real time clock circuit 7A, carry out the data processing (as that patch is 7B, then only carry out data processing) of power consumption by multiple rate system by common rate system; As counter-rotating, then record counter-rotating number of times when the counter-rotating number of times reaches some (as continuous three times), thinks that then the user is carrying out " reversal connection stealing ", promptly controls the power supply that power-supplying circuit 8 cuts off the user.As receive only have only one road pulse signal, and certain number of times (as continuous three times) appears continuously, then in record rotating disk number, display alarm symbol on digital display circuit 9, remind user notification power supply department on-call maintenance, otherwise continue to have used as the user (as 10 degree) behind the electric energy of some, CPU will control the power supply that power-supplying circuit 8 cuts off the user, till after the maintenance well again.

When having a power failure; the output voltage of the direct current regulation circuit of system power supply 2 will be dropped to when being lower than in the power cut detection circuit 5 U3 work threshold values gradually by 5V; the output terminal of U3 becomes low level; this low level is input to the I/O port of CPU; CPU is after receiving this low level signal; carry out to have a power failure handle subroutine immediately, the data that will protect are deposited by the memory cell that the internal RAM of CPU is sent to 7A or 7B.After this power to U2 by standby lithium battery BAT, make U2 do as usual timing and the influence that do not had a power failure, and the data among the RAM in the U2 can not lost yet.If that peg graft is 7B, the data that then are deposited with among the 7B can forever be preserved.When restoring electricity, the output terminal of U3 reverts to high level again, and CPU will be deposited with the internal RAM of the data retrieval CPU of U2 or U6 again, the beginning operate as normal.When the user uses up purchasing electric weight, CPU makes corresponding I/O port (as RAO) output low level, make triode T1 conducting, relay J 1 gets electric adhesive, the normally closed contact of J1 disconnects, and stops the power supply to the user, inserts effective IC-card of newly purchasing again until the user, then CPU adds dump energy automatically and newly purchases electric weight, and shows on digital display circuit 9.

Claims

1, a kind of multiple rate and the dual-purpose prepayment meter of single rate comprise the common induction type electric energy meter of existing product (1), it is characterized in that it also includes newly-designed control table (2 to 13), and:

A) evenly coat at the edge of the rotating disk of common induction type electric energy meter (1) a bit of pitch-dark or stick a bit of black Pressure sensitive adhesive tape and form sampling rotating disk (11), two reflective Photoelectric infrared switches (12) and (13) mutually close with the edge of sampling rotating disk (11) are installed on the frame of common induction type electric energy meter (1), and make length pitch-dark or the black Pressure sensitive adhesive tape be a bit larger tham spacing distance between two optoelectronic switches 12 and 13, Photoelectric infrared switch (12) combines with sampling rotating disk (11) with (13), the electric power analog-signal transitions that common induction type electric energy meter (1) is measured becomes pulse digital signal, Photoelectric infrared switch (12) links to each other with the input end of power consumption sampling processing circuit (4) respectively with the signal output part of (13), send power consumption sampling processing circuit (4) to handle pulse digital signal, the signal after the processing flows to the one-chip computer circuit (3) that links to each other with power consumption sampling processing circuit (4) output terminal again and handles;

B) being loaded with effective IC-card (10) of purchasing electric weight and code data is plugged in the IC-card seat of IC-card read/write circuit (6), IC-card read/write circuit (6) combines with the one-chip computer circuit (3) that is connected, finish the read-write operation to IC-card, one-chip computer (3) outside connects with real time clock circuit (7A) and Serial E ²PROM memory circuit (7B) (7A and the 7B use of can not pegging graft simultaneously, when promptly working can only alternatively), one-chip computer circuit (3) outside also is connected with power cut detection circuit (5);

C) after one-chip computer circuit (3) was handled the signal of input, the digital display circuit (9) that connects outside showed related content, and outputs signal to continuous power-supplying circuit (8).The power supply of the common induction type electric energy meter (1) that is attached thereto by power-supplying circuit (8) control, system power supply (2) provides working power for the power end of The whole control watch circuit (3) to (9) from output terminal E.

2, multiple rate as claimed in claim 1 and the dual-purpose prepayment meter of single rate, it is characterized in that, one-chip computer circuit (3) is by one-chip computer U1, resistance R 2 and capacitor C 8 are formed, power consumption sampling processing circuit (4) is made up of a slice single supply double operational collecting circuit U5 and resistance R 8 to R17, power cut detection circuit (5) is made of economical reseting circuit U3, IC-card read/write circuit (6) is made of IC-card seat CZ1, power-supplying circuit (8) is by triode T1, resistance R 1, diode D1, relay J 1 and voltage dependent resistor (VDR) MY1 form, and digital display circuit (9) is total to anode charactron W1 to W4 by four, triode T2 to T5 and resistance R 3 to R7 are formed.

3, as claim 1,2 described multiple rate and the dual-purpose prepayment meters of single rate, it is characterized in that, real time clock circuit (7A) is formed a module by serial real time clock integrated circuit U2, crystal oscillator OC1, standby lithium battery BAT and diode D2 and D3, is connected through corresponding I/O port of connector P1 to P5 and U1 and system power supply; Serial E ²PRO memory circuit (7B) is made up of data memory U6 and corresponding integrated circuit socket, and the input end of clock CLK of U6 and serial data I/O hold the respective pins of the real time clock integrated package U2 of SDA and real time clock circuit (7A) to link together and be connected to two the I/O ports of U1 in the one-chip computer circuit (3).