CN2195759Y

CN2195759Y - Intelligent watt-hour meter

Info

Publication number: CN2195759Y
Application number: CN 93248102
Authority: CN
Inventors: 柴波; 鲍永夫
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-12-27
Filing date: 1993-12-27
Publication date: 1995-04-26
Anticipated expiration: 2003-12-27

Abstract

The utility model discloses an intelligent watt-hour meter. The utility model relates to an electricity meter used for solving the power supply management style which is traditional and laggard and for preventing various behaviors of electric larceny. The utility model is composed of the connection in parallel of an intelligent electric card device and an existing watt-hour meter. The intelligent electric card device is mainly composed of a power supply circuit (1), a measurement sampling circuit (2), a micro computer circuit (3), an electric card interface circuit (4), a load current flow transformer circuit (5), a signal amplification arbitration circuit (6) and a switching executive circuit (7). The intelligent electric card device is connected in parallel with a watt-hour meter to form the intelligent watt-hour meter, the means of power utilization after the payment of users can be realized, the utility model has the inherent functions of implement of multiple time intervals, charging with multiple rates, current limiting, etc. Can be realized, and the occurrence of various electric larceny phenomena can be prevented by the utility model at the same time.

Description

Intelligent watt-hour meter

The utility model belongs to a kind of electronic device, is mainly used in a kind of intelligent watt-hour meter how many metering electric weight prevents stealing.

People generally also use the induction type character wheel to show watt-hour meter at present, and there is the defective of the following aspects in the way to manage of paying the fees after the first electricity consumption of this manual metering charge.(1) make electricity management department work at different levels passive, be that dullness is cumbersome again, waste of manpower and energy, the manual toll collection difficulty is exerted oneself in addition " electricity use based on human relationships ", cause damage to country, (2) ammeter itself, although the device ammeter before, ammeter had been done verification, seal up, but because the unmodifiable parallel operation mode of connection, making much has electrician Chang Shizhe to be easy to stride table robber electricity slightly, makes country suffer great economic loss.In addition, a kind of controller for preventing illegal use of electricity that present report has been succeeded in developing only is single goal with anti-electricity-theft, in case user's stealing promptly enters dead guard mode, recovers again to send electricity to need artificial treatment, correction.The defective of this device is 1. can not realize to break rules and regulations to punish automatically, can not realize the regional network management, 2. cuts off user's violating the regulations supply line continually, and ratio had increased managerial personnel's workload originally exponentially when restoring electricity; Simultaneously, also can not prevent the use of " electricity use based on human relationships " fully.

The purpose of this utility model is to overcome above-mentioned existing problem, design the electric card device of a kind of intelligence a kind of intelligence electricity card watt-hour meter that combines in parallel with existing ammeter, make it to realize computer network management, make power supplier and user by electricity card form unmodifiable " one to one " relation on a kind of card vending machine and the electricity card watt-hour meter, the useful former ammeter meter degree character wheel of design produces in the utility model " degree pulse " added up electric weight; Adopt semiconductor devices that information such as power consumption, stealing record are remembered; To the existence of electricity card whether to adopt micro computer, true and false situation is discerned, and at any time user's electricity consumption situation is carried out synchronously monitoring automatically and handles, and prevents to steal electricity and " electricity use based on human relationships " behavior.

The utility model is to realize with following technical measures: it is to be combined with existing ammeter is in parallel by the electric card device of a kind of intelligence, and the electric card device of described intelligence is by transformation, rectification, filtering circuit (1), constitute by watt-hour meter and degree pulsating sampler, and the electric quantity metering of generation degree pulse signal and sample circuit (2), the break-make of control power supply, produce interrupt response and add up and handle the micro computer and the cryptochannel (3) of planting signal the second month in a season, EEPROM is the electricity card circuit (4) of main devices, the load current amount transformer circuit (5) that two straight leads of current opposite in direction and endless solenoid and rectifying and wave-filtering constitute, the signal that constitutes by amplifier comparer and phase inverter and resistor thereof amplify plant the second month in a season circuit (6) and or the break-make executive circuit (7) that constitutes of door and assembly thereof form.Described transformation, rectification, filtering circuit (1) are made up of transformer T1, rectifier bridge B1, inductance I1, electric capacity E2, resistance R 3; Described electric quantity metering and sample circuit (2) watt-hour meter that is made of watt-hour meter and degree pulsating sampler adopts character wheel induction type single-phase watt-hour meter, and the degree pulsating sampler is made up of resistance R 17, capacitor C 2 and reverser (74LSO4); Micro computer and cryptochannel (3) are made up of CPU8031, address latch 74ls373, memory under program EPROM2764, crystal oscillating circuit 6MHZ, electrify restoration circuit, hardware encryption setting and electric card P1, timer frequency dividing circuit, and wherein reset circuit is made up of electric capacity E1, resistance R 16, R15; Hardware encryption is provided with and electric card P1 is made up of 8 DIP switch, KK1, last connecting resistance RK1; The timer frequency dividing circuit is made up of diode DI01, triode 3DK28, reverser 74LS04, frequency divider 74LS393,74LS74 circuit; Electricity card circuit is made up of memory device EPROM2816A, upper electrical switch S1, reset key S2 and three pilot lamp L2, L3, L4.Described load current amount sampling transformer circuit (5) by mutual inductor coil L1, and formed by the current rectifying and wave filtering circuit that DD1, CC1, R1, R2 constitute; Signal amplifies and arbitration circuit (6) is made up of resistance R 6, R7, R8 amplifier comparer LM311, phase inverter 74LS04 and rheostat P3; Current switching executive circuit (7) be by or door 74LS32,74LS08,74LS74, resistance R 10, R11, R12 and solid-state relay SSRB2, B3 form.

The utility model is to be used for user's electricity consumption situation is carried out synchronously monitoring automatically and control.The advantage that has antitheft electricity simultaneously, it thoroughly change the conventional management mode of paying the fees after the present first electricity consumption and become pay the fees earlier the back electricity consumption advanced way to manage.It makes power supplier and user form unmodifiable " one to one " relation by a kind of sale of electricity form, has realized stealing the built-in function that electric energy is discerned automatically, punished automatically, makes power supply management reach intelligent, scientific.The utility model self energy consumption is little, and discrimination is accurate, also have simultaneously volume little, in light weight, be easy to install, need not do any transformation (promptly annexing fully) existing electrical network with existing supply network hardware.

The utility model description of drawings:

Fig. 1 is the utility model circuit block diagram.

Fig. 2 is the utility model circuit theory diagrams.

Fig. 3 is metering sample circuit schematic diagram.

Fig. 4 is the microcomputer circuit theory diagram.

Fig. 5 is electricity card circuit theory diagrams.

Fig. 6 is the transformer circuit schematic diagram.

Fig. 7 plants circuit theory diagrams the second month in a season for signal amplifies.

Fig. 8 is a break-make executive circuit schematic diagram.

In conjunction with Figure of description principle of work of the present utility model and flow process are described further:

The utility model shown in Fig. 1,2 is amplified by power circuit 1, electric quantity metering and sample circuit 2, micro computer and cryptochannel 3, electricity card circuit 4, load current amount sampling transformer circuit 5, signal to be formed with arbitration circuit 6, current switching executive circuit 7.Wherein sample circuit 2(is shown in Figure 3) drive a pointer by the character wheel of character wheel formula induction meter, whenever turn around and connect two contacts and produce a degree pulse signal and give microcomputer circuit 3, make CPU(8031) generation interrupt response, to spend pulse adds up, write the electricity card, the automatic gauge that makes CPU add deduct and utilize electric weight to reach to electric card interface circuit 4 mnemons, simultaneously micro computer compares memory the user applies electricity consumption number of degrees and automatic gauge value in the electricity card, the difference of the two is that a pilot lamp L3(who lighted on the electricity card in 1 o'clock is shown in Figure 5), this recasting of prompting user has blocked, its difference is 0 o'clock, a level control of micro computer 8031 outputs break-make executive circuit 7 is disconnected, stop power supply; Transformer circuit 5 is used for responding to the size of electric current on current through meter front end live wire and the negative transversal, whether stride electricity filching behaviors such as table wiring through differentiating the user, equate to be normal electricity consumption as size of current, be stealing as not waiting, give signal with induction electromotive force through rectifying and wave-filtering and amplify arbitration circuit 6, import a level signal by arbitration circuit and give break-make executive circuit 7, make it to be in disconnected, stop power supply, arbitration circuit 6 outputs one level signal is given microcomputer circuit 3 simultaneously, start timer, the every mistake of timer is once interrupted to the CPU8031 application for 1 second, and the time tire out remembers and write and check and punish when electric card interface circuit 4 is write card for next time; The user stops stealing, timer cuts out, and automatic recovery of power supply immediately, microcomputer circuit 3 is decrypted true or false and the uniqueness of determining the electricity card with cryptographic calculation according to the password (shown in Figure 4) of hardware encryption interface setting and the various numerical ciphers that write in the electricity card simultaneously, give break-make executive circuit 7 as control signal of nonconforming then micro computer output, make it be in disconnected state, the refusal power supply.(the various numerical ciphers in the described electricity card are write by a kind of card vending machine in the power supply management system, so use of the present utility model must be earlier electric Qana to be bought to power supply department, promptly how much write power supply by card vending machine, or power supply department carries the card vending machine sale of electricity of calling, then electric Qana is returned and insert electric card and make the utility model production run work, so power supply department and user are " one to one " relations, realized buying earlier the management method of electricity back electricity consumption).

Workflow of the present utility model: at first hold electricity and be stuck in power supply department and buy, the electricity card (as shown in Figure 5) that the user will make is gone up switch S 1 and is pushed the left side with the electric card slot on the electricity card insertion ammeter, again S1 is pushed the right, it is bright that the electricity card is gone up pilot lamp L2, click the S2 key, micro computer is started working (as shown in Figure 4), micro computer judges at first whether the electricity card is inserted in the groove, read one group of password in the electricity card EEPROM then, the combined with hardware password setting is carried out specific encrypt and decrypt computing, carries out the BCH verification again, to judge the true or false of electricity card, uniqueness, output control signal 5 is given break-make executive circuit (shown in Figure 8), and one of criterion of SSR on-off is provided.Metering sample circuit (shown in Figure 3) is the pointer OA that a centre is had insulating spacer C, the O end is fixed on the transmission gear of character wheel motor meter, no matter rotate forward or reverse by gear driven OA, OA whenever turns around and the pair of contact of K1 is connected once, formed a negative pulse of signal 1, this negative pulse is shown in Figure 4 to the signal 3(of microcomputer circuit) through the anti-phase positive pulse that becomes, this positive pulse rising edge makes 8031 single-chip microcomputers produce an interruption, power consumption is added 1, interrupt service routine is compared to practical electric weight accumulative total with the application power consumption simultaneously, the difference of the two is 1, lighting the last L3 lamp of electricity card is about to use up to accuse the user applies electric weight, if 0, micro computer output signal 5 is given the break-make executive circuit, produces one of disconnected criterion.It is input live wire and the user load line that entangles ammeter with the endless solenoid of a band magnet ring for a transformer circuit (shown in Figure 6), the two size of current is equal substantially, but direction is opposite, induced electromotive force approaches 0 in the endless solenoid like this, be the V+=0 of I1 ≠ I2 after rectification, prove non-loaded or the normal electricity consumption of user, if user's stealing then I ≠ IV+〉〉 0, giving signal amplification arbitration circuit (shown in Figure 7) with V+ is compared by V+ and reference signal V-, V-can transfer RL(P3) determine, promptly transfer RL at I1 ≈ I2(or I1=I2=0) time, arbitration circuit output signal 6 is a low level.Signal 6 is passed to the break-make executive circuit, form another criterion of SSR on-off, synchronous signal 6 is passed to the microcomputer circuit frequency divider to start timer, so that carry out the stealing timing, timer 1MS asks a CPU8031, produces INTO and interrupts, carry out timing by 8031, add up the stealing time in the electricity card to refresh once per 1 second, intermittently lights the electricity card simultaneously and go up the L4 lamp, to show alarm.Break-make executive circuit (shown in Figure 8), performer is the SSR solid-state relay, it is contactless, drive current is little, and power consumption is few, safety coefficient is high, the life-span is long, and

signal

7 and 8 decision SSR's is logical and disconnected, SSR is logical when

signal

7 and 8 all is low level, power supply, the two one of stop power supply when high, that is to say only normal at the electricity card, when the user did not have electricity filching behavior, SSR was for logical, in case the user has electricity filching behavior, or use illegal electricity card, or the electric weight of application when having used up SSR break.

Claims

1, a kind of intelligence electricity card watt-hour meter, it is characterized in that it is to be combined with existing ammeter is in parallel by the electric card device of a kind of intelligence, the electric card device of described intelligence is by transformation, rectification, filtering circuit (1), watt-hour meter and degree pulsating sampler constitute, and the electric quantity metering of generation degree pulse signal and sample circuit (2), the break-make of control power supply, produce interrupt response and add up and handle the micro computer and the cryptochannel (3) of planting signal the second month in a season, EEPROM is the electricity card circuit (4) of main devices, the load current amount transformer circuit (5) that constitutes by two straight leads of current opposite in direction and endless solenoid and rectifying and wave-filtering, the signal that constitutes by amplifier comparer and phase inverter and assembly thereof amplify plant the second month in a season circuit (6) and or the break-make executive circuit (7) that constitutes of door and assembly thereof form.

2, by the described intelligence electricity of claim 1 card watt-hour meter, it is characterized in that described transformation, rectification, filtering circuit (1) are made up of transformer T1, rectifier bridge B1, inductance I1, electric capacity E2, resistance R 3.

3, by the described intelligence electricity of claim 1 card watt-hour meter, it is characterized in that described electric quantity metering and the sample circuit (2) that constitutes by watt-hour meter and degree pulsating sampler, wherein watt-hour meter adopts character wheel induction type single-phase watt-hour meter, and the degree pulsating sampler is made up of resistance R 17, capacitor C 2 and reverser (74LSO4).

4, by the described intelligence electricity of claim 1 card watt-hour meter, it is characterized in that described micro computer and cryptochannel (3) are made up of CPU8031, address latch 74ls373, memory under program EPROM2764, crystal oscillating circuit 6MHZ, electrify restoration circuit, hardware encryption setting and electric card P1, timer frequency dividing circuit, wherein reset circuit is made up of electric capacity E1, resistance R 16, R15; Hardware encryption is provided with and electric card P1 is made up of 8 DIP switch, KK1, pull-up resistor RK1; The timer frequency dividing circuit is made up of diode DI01, triode 3DK28, reverser 74LS04, frequency divider 74LS393,74LS74 circuit.

5, by the described intelligence electricity of claim 1 card watt-hour meter, it is characterized in that described electricity blocks circuit and is made up of memory device EEPROM2816A, upper electrical switch S1, reset key S2 and three pilot lamp L2, L3, L4.

6, by the described intelligence electricity card watt-hour meter of claim 1, it is characterized in that described load current amount sampling transformer circuit (5) by mutual inductor coil L1, and formed by the current rectifying and wave filtering circuit that DD1, CC1, R1, R2 constitute.

7, by the described intelligence electricity of claim 1 card watt-hour meter, it is characterized in that described signal amplifies and arbitration circuit (6) is by resistance R 6, R7, R8, amplifier comparer LM311, phase inverter 74LS04 and rheostat P3 form.

8, by claim 1,2,3,4,5,6,7 described intelligence electricity card watt-hour meter, it is characterized in that described current switching executive circuit (7) be by or door 74LS32,74LS08,74LS74, resistance R 10, R11, R12 and solid-state relay SSRB2, B3 form.