CN2786636Y

CN2786636Y - Electronic type prepay carrier wave electric energy meter

Info

Publication number: CN2786636Y
Application number: CN 200420042250
Authority: CN
Inventors: 杨永峰
Original assignee: LURUI POWER SUPPLY AUTOMATION CO Ltd XI'AN
Current assignee: LURUI POWER SUPPLY AUTOMATION CO Ltd XI'AN
Priority date: 2004-07-27
Filing date: 2004-07-27
Publication date: 2006-06-07
Anticipated expiration: 2014-07-27

Abstract

The utility model has relates to an electronic type prepay carrier wave energy meter, which has the advantages of high and reliable stability, accurate measurement and long service life, and can complete a prepay carrier wave copy collection function. The utility model comprises a singlechip to which an ADE7755 metrology chip and a PL3105 carrier wave chip are respectively connected. The PL3105 carrier wave chip is connected with an information button. A magnetic core transformer is connected to the PL3105 carrier wave chip. A current divider and a divider resistor are connected to the ADE7755 metrology chip.

Description

The electronic prepayment carrier electric energy meter

One, technical field:

The utility model relates to a kind of metering electric energy meter, especially relates to a kind of electronic prepayment carrier electric energy meter.

Two, background technology:

Existing IC-card formula electronic prepayment electric power table must be offered the plug-in card hole at watch case, IC-card is inserted finish pre paid functionality, dust, the humid air of off-balancesheet can be entered in the table, makes the table metering inaccurate and cause fault and accident.IC-card is prevented magnetic, water proofing property, soil resistance, relatively poor, easy to break, the rapid wear of encryption, and back reading and writing data error rate is higher for several times for plug-in card.In addition, existing electric energy meter can not be finished time-shared charge carrier-wave transmission, centralized automatic meter-reading function, can't realize the electrical management robotization.

Three, utility model content:

The utility model provides a kind of electronic prepayment carrier electric energy meter in order to solve the weak point in the above-mentioned background technology, and it has highly reliable stability, accurate measurement, and long service life, and can finish pre-payment carrier wave collection and copy function.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of electronic prepayment carrier electric energy meter, its special character is: comprise single-chip microcomputer, be connected with computation chip and carrier chip on the single-chip microcomputer respectively, carrier chip and information button link and connect.

Above-mentioned carrier chip is the PL3105 carrier chip.

Above-mentioned computation chip is the ADE7755 computation chip.

Be connected with core transformers on the above-mentioned PL3105 carrier chip.

Be connected with shunt and divider resistance on the above-mentioned ADE7755 computation chip.

Compared with prior art, the advantage and the effect that the utlity model has are as follows:

1, the utility model adopts the information button to finish pre paid functionality, and information button profile is similar to a button cell, can be embedded on the article such as key chain.The information button realizes that by a multi-functional device with data line, address wire and power lead be single line, the realization single line connects, the information button responds main frame by the switching between 500.000 Ω and the 50 Ω impedances, have the communication of contact single-wire-protocol, moment read-write, because of single-wire-protocol need not the watchcase perforate, finish connection but draw the single line terminal in the table, have intact table body sealing;

2, the utility model adopts the PL3105 chip, aims at open automatic data logging design, especially has high precision mould/number conversion and spread spectrum communication unit and LED/LCD display control module except having microprocessor, and has the E of built-in word 16K byte ²The SRAM of PROM program storage and 1K byte, 256 byte SRAM and real time clocks of 8/16 microprocessor internal.PL3105 fully develops chip in the table, finishes pre-payment carrier wave collection and copies function, realizes that a table is multi-functional, improves measuring accuracy of electric energy meter, prolongs electric energy meter serviceable life, reduces installation difficulty and space;

3, the utility model adopts the information button for purchasing dielectric, has highly reliable stability, waterproof, antimagnetic, antifouling, and encryption is good, and reading and writing data is quick and precisely;

4, the utility model has been realized peak, flat, paddy electric energy metrical at times, and adopts spread spectrum communication to finish the carrier wave collection and copy function, and the regulation and control electric load reduces the electric power investment, effectively promotes reform electricity charge policy, improves the electrical management modernization level.

Four, description of drawings:

Fig. 1 is a schematic block circuit diagram of the present utility model;

Fig. 2 and Fig. 3 are circuit theory diagrams of the present utility model.

Five, embodiment:

Referring to Fig. 1, Fig. 2 and Fig. 3, comprise single-chip microcomputer, be connected with ADE7755 computation chip and PL3105 carrier chip on the single-chip microcomputer respectively, PL3105 carrier chip and information button link and connect, be connected with core transformers on the PL3105 carrier chip, be connected with shunt and divider resistance on the ADE7755 computation chip.The utility model electric energy metrical partly adopts the ADE7755 computation chip, and power supply adopts transformer self coupling dividing potential drop, obtains stable 5V voltage through the 78L05 voltage stabilizing, and current sample adopts 350 μ Ω shunts, and voltage sample adopts electric resistance partial pressure.ADE7755 computation chip internal current signal and voltage signal are converted to digital signal through AD, are converted to pulse signal output by numerical frequency after the computing.Pulse signal is sent two paths of signals through optocoupler, and one the tunnel is used for calibration, and one the road delivers to control chip.The utility model pre-payment and carrier wave partly adopt the PL3105 carrier chip, and use big character liquid crystal Chinese character to show.The PL3105 carrier chip is integrated power line carrier communication integrated circuit and 8/16 bit microprocessor; adopted CMOS DA combination manufacturing process; wherein integrated multichannel A/D converter; comprise digital signal processing unit and 8/16 complicated bit microprocessor in the spread spectrum communication parts; the A/D that inner integrated two-way is 16, LED/LCD display control module, three timers; two multifunctional serial ports, and E with built-in word 16K byte ²The SRAM of PROM program storage and 1K byte, 256 byte SRAM and real time clocks of 8/16 microprocessor internal can continue power supply by reserve battery and keep under the situation of primary power power down.In the utility model common segment, all information all are stored in the 24C04 (Serial E in the table ²PROM) in, table number, time, pulse constant, relay control password are by 485 or infrared the setting.Liquid crystal is that single-chip microcomputer directly drives, need not driving circuit.In the utility model metering section, the ADE7755 computation chip produces pulse signal, sends into PL3105 carrier chip P16 pin through optocoupler, add up after the filtering, add up and with the pulse constant relatively, every 1/100KWH once deposits the 24C04 operation, corresponding dump energy subtracts 1/100KWH.The utility model adopts DALLAS information button (linear memory) to realize the pre-payment operation, realizes read-write operation to button by the P33 pin of PL3105 carrier chip.The button type is divided into checks that button, removing button, test button, the button of opening an account-user's button-empty user detain.After checking that button bumps button, show pulse constant, dump energy, purchase electric number of times, total electric weight, table number.Remove button use restricted, must the short circuit table in " SETEP " and " GND ", bump button after, remove the interior prepayment information of table.Opening an account is buckled under the state of opening an account and can not uses, bump button after, all information of user are sent into ammeter, write button and be empty user's button, can purchase electricity, purchase electricity after, write button and detain for the user.Deciliter relay adopts the 50A magnetic latching relay, when dump energy be 0 or during the alarm electric weight P34, the P35 pin output assembled pulse of PL3105 carrier chip give XC2023 (relay chip for driving), drive the relay outage.Relay damaged can not be cut off the power supply, then metering section meter negative electricity.The reception of the utility model carrier wave and transmission are realized that by core transformers T3 the core transformers primary coil inserts the 220V AC power through electric capacity.Carrier wave receives by the T3 coupling and handles through the SIGIN pin, and the P17 pin that carrier wave sends by the PL3105 carrier chip is coupled into AC power through the two-stage push-pull power amplifier by core transformers T3.

Claims

1, a kind of electronic prepayment carrier electric energy meter is characterized in that: comprise single-chip microcomputer, be connected with computation chip and carrier chip on the single-chip microcomputer respectively, carrier chip and information button link and connect.

2, electronic prepayment carrier electric energy meter according to claim 1 is characterized in that: described carrier chip is the PL3105 carrier chip.

3, electronic prepayment carrier electric energy meter according to claim 2 is characterized in that: described computation chip is the ADE7755 computation chip.

4, electronic prepayment carrier electric energy meter according to claim 3 is characterized in that: be connected with core transformers on the described PL3105 carrier chip.

5, electronic prepayment carrier electric energy meter according to claim 4 is characterized in that: be connected with shunt and divider resistance on the described ADE7755 computation chip.