CN201060225Y

CN201060225Y - Pre-payment single-phase IC card carrier electrical energy meter

Info

Publication number: CN201060225Y
Application number: CNU200720101042XU
Authority: CN
Inventors: 尚群柱
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-16
Filing date: 2007-04-16
Publication date: 2008-05-14
Anticipated expiration: 2017-04-16

Abstract

The utility model provides a prepaying single phase IC card carrier wave watt-hour meter, which belongs to the measurement technology field, and the watt-hour meter is used for preventing the theft of electricity. The utility model provides the technical proposal that the watt-hour meter consists of an electricity source processing circuit, a singlechip, an energy measuring circuit, a carrier wave receiving and emitting coupling circuit, a LCD U5, an IC card reading and writing control circuit, a pulse outputting circuit, and a relay control circuit. The utility model has high measurement precision, high speed, and less power consumption; electricity cannot be stolen by the current reverse connection method; the meter recording and charge managing center can monitor the electricity consumption information of users, can control a power supply loop, can detect and stop the theft of the electricity, can lessen the economic loss, and can eliminate the hidden accident.

Description

The single-phase IC-card carrier electric energy meter of pre-payment

Technical field

The utility model relates to a kind of prepayment IC-card electric energy meter, has thief-proof and the electric line carrier communication function, belongs to field of measuring techniques.

Background technology

Electricity is the indispensable energy in industrial and agricultural production and the people's daily life, and in order to make rational planning for power consumption and collect the electricity charge, power department has been installed watt-hour meter in supply line, so that the power consumption of metering user.Existing IC-card pre payment watthour meter does not have anti-theft device, orders about down in economic interests, often has the people to open watt-hour meter privately, and his-and-hers watches inner control parts are changed, to reach the purpose of stealing.After control assembly is reequiped, watt-hour meter meeting long-term work, the user needn't purchase again.To this electricity filching behavior, power department can not find in time that generally this not only causes economic loss to country, but also can bring electric leakage, accident potential such as catch fire, the safety of life and property around serious threat.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of single-phase IC-card carrier electric energy meter of pre-payment with anti-electricity-theft and communication function is provided.

Problem described in the utility model realizes with following technical proposals:

The single-phase IC-card carrier electric energy meter of a kind of pre-payment, be made up of power supply processing circuit, single-chip microcomputer U4, energy meter circuit, carrier transmitting-receiving coupled circuit, LCD display U5, IC-card read-write control circuit, impulse output circuit and control relay circuit, the formation and the annexation of each several part circuit are as follows:

A. the energy meter circuit is made up of current sampling circuit, voltage sampling circuit and electric energy computation chip U1, described current sampling circuit is made of current transformer CT, current transformer CT is connected on the phase line of single-phase alternating current, the neutral earthing of its output winding, the filtering circuit that one end of output winding is formed through a resistance R _ f 1 and capacitor C f1 connects the V1P end of electric energy computation chip U1, and the filtering circuit that the other end is formed through a resistance R _ f 2 and capacitor C f2 connects the V1N end of electric energy computation chip U1; Described voltage sampling circuit is made of potentiometer W and a resistance R 9, potentiometer W one end ground connection, and the other end is through the phase line of resistance R 9 order cross streams electricity, and the output signal of its sliding end connects the V2P end of electric energy computation chip U1 after capacitor C 5 filtering; The output signal of the CF end of described electric energy computation chip U1 connects the pin 10 of single-chip microcomputer U4;

B. the carrier transmitting-receiving coupled circuit is made up of coupling transformer T, carrier signal receiving circuit and carrier signal transtation mission circuit, the primary coil of described coupling transformer T is connected to through a capacitor C 3 between the phase line and zero line of single-phase alternating current, and secondary coil is carried ripple signal receiving circuit and carrier signal transtation mission circuit; Described carrier signal receiving circuit by the triode T5 that is connected into common-emitter amplifier with and collector load resistor R7, upper offset resistance R 5, below-center offset resistance R 6, repeating resistance R4 constitute, the base stage of triode T5 meets coupling transformer T through repeating resistance R4, the output signal of its collector connects the SIGin end of single-chip microcomputer, also is connected to two antiparallel diodes between the base stage of triode T5 and the emitter; Described carrier signal transtation mission circuit comprises four triodes, be respectively the first triode T1, the second triode T2, the 3rd triode T3 and the 4th triode T4, wherein the first triode T1 and the second triode T2 are connected into the OTL power amplifier, its output terminal meets coupling transformer T through a capacitor C 4 and an inductance L, the complementary amplifier that the 3rd triode T3 and the 4th triode T4 are connected into is the promotion level of above-mentioned OTL power amplifier, and the base stage of the 3rd triode T3 and the 4th triode T4 connects the PSKout end of single-chip microcomputer respectively through a resaistance-capacity coupling circuit;

Pin 1～pin 4 of c.LCD display U5 connects the pin 53～pin 56 of single-chip microcomputer respectively, and pin 5～pin 28 of LCD display U5 connects the pin 58～pin 33 of single-chip microcomputer respectively,

D.IC card read-write control circuit connects the pin 30 and the pin 31 of single-chip microcomputer.

The single-phase IC-card carrier electric energy meter of above-mentioned pre-payment, described control relay circuit is made of magnetic latching relay J and bidirectional drive U2 thereof, the RON of bidirectional drive U2, ROFF end connects the pin 24 and the pin 27 of single-chip microcomputer respectively, the coil of the CKA of bidirectional drive U2, CKB termination magnetic latching relay J, parallel resistance R3 on the coil of magnetic latching relay J, its normally opened contact J-1 is series in the current supply circuit.

The single-phase IC-card carrier electric energy meter of above-mentioned pre-payment is set up the calibration circuit, and described calibration circuit is made of photoelectrical coupler U3, and the light emitting diode in the photoelectrical coupler U3 is held through the CF that resistance R 8 meets electric energy computation chip U1, and the output termination of photoelectric tube is proofreaied and correct electric energy meter.

The utility model utilizes electric energy computation chip to convert electric current, the voltage signal of gathering to the active power signal, and the active power signal delivered to single-chip microcomputer, carry out energy meter by single-chip microcomputer, and will measure the result and be presented on the LCD display, this electric energy gauging method is the measuring accuracy height not only, speed is fast, and power consumption is little, and can effectively prevent electric current reversal connection electricity filching behavior.When the user purchased electric weight and is zero, single-chip microcomputer output relay control signal disconnected current supply circuit, had only after the user purchases electricity and IC-card inserted draw-in groove, and single-chip microcomputer just can make current supply circuit connect, and restores electricity.Single-chip microcomputer also sends to counting cost by gas meter administrative center by the carrier transmitting-receiving coupled circuit with user's power information, and acceptance is from the control information of counting cost by gas meter administrative center, like this, when the illegal stealing of user, counting cost by gas meter administrative center just can in time find, and send the outage control signal, stop electricity filching behavior.After the staff restores electric energy meter, send by the center of checking meter and to send electric signal, restore electricity.Impulse output circuit is used for the calibration of electric energy meter.The utility model measuring accuracy height, speed is fast, power consumption is little, and can't use the stealing of electric current reversal connection mode, counting cost by gas meter administrative center can monitor user's power information, and can control current supply circuit, in time finds and prevent electricity filching behavior, for power department reduces economic loss, and eliminated accident potential.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is an electric theory diagram of the present utility model; Fig. 2 is an electrical schematic diagram.

Each label is among the figure: U1, electric energy computation chip, U2, relay driver, U3, photoelectrical coupler, U4, single-chip microcomputer, U5, LCD display.

Embodiment

The model of each integrated package is among the figure: U1 is AD7755, and U2 is XC2023, and U3 is PS2501-1, and U4 is PL3105C-641, and U5 is LCD-CX41203.

Among Fig. 2, electric energy computation chip AD7755 is a kind of high-performance electric energy measurement integrated circuit, and its dynamic range is big, and high accuracy and long-time stability are arranged, the CF output port of AD7755 is used for verification and and interface microcontroller with higher frequency form active power of output instantaneous value.The current signal of current transformer CT output adopts differential mode to hold input by V1P, V1N behind filtering circuit, and the output signal of potentiometer W sliding end is by the input of V2P end, and the CF of electric energy computation chip AD7755 holds the active power of output momentary signal.Adjusting potentiometer W can be to the instrument verification that gains.

Among Fig. 2, single-chip microcomputer PL3105C-641 has carrier communication and relay control function, and its application can make circuit simpler, and reliability is higher.

The course of work of carrier communication circuit: under normal circumstances, the center of checking meter is sent and is opened modulation signal, signal is delivered to carrier communication circuit by line of electric force, this signal enters coupling transformer T through high-pass filtering capacitor C3, the signal of coupling transformer T output enters the common-emitter amplifier of being made up of triode T5 through resistance R 4, signal after the amplification enters single-chip microcomputer and carries out demodulation, and single-chip microcomputer output relay control signal is connected major loop.The effect of inverse parallel diode D1, D2 is to the input signal amplitude limit.Single-chip microcomputer is delivered to the PSKout end to the modulation signal that contains the electric energy meter job information, this signal is respectively through capacitor C 1, with resistance R 1,2 two resaistance-capacity coupling circuits of capacitor C 2 and resistance R are sent to triode T3, the base stage of T4, by triode T3, T4 is amplified into by triode T1, the OTL power amplifier that T2 forms amplifies, signal after the amplification is through capacitor C 4, inductance L is delivered to coupling transformer T, then through high-pass filtering capacitor C1, line of electric force is delivered to the center of checking meter, and the staff at the center of checking meter can judge according to the information of collecting whether electric energy meter work is normal.Illegally transform electric energy meter as the people, when using electric energy under not purchasing electric situation, the staff at the center of checking meter just can in time find, take anti-theft measure.

Claims

1. single-phase IC-card carrier electric energy meter of pre-payment, it is characterized in that, it is made up of power supply processing circuit, single-chip microcomputer (U4), energy meter circuit, carrier transmitting-receiving coupled circuit, LCD display (U5), IC-card read-write control circuit, impulse output circuit and control relay circuit, and the formation and the annexation of each several part circuit are as follows:

A. the energy meter circuit is made up of current sampling circuit, voltage sampling circuit and electric energy computation chip (U1), described current sampling circuit is made of current transformer (CT), current transformer (CT) is connected on the phase line of single-phase alternating current, the neutral earthing of its output winding, the filtering circuit that one end of output winding is formed through resistance (Rf1) and electric capacity (Cf1) connects the V1P end of electric energy computation chip (U1), and the V1N that the filtering circuit that the other end is formed through resistance (Rf2) and electric capacity (Cf2) connects electric energy computation chip (U1) holds; Described voltage sampling circuit is made of potentiometer (W) and resistance (R9), potentiometer (W) end ground connection, the other end is through the phase line of resistance (R9) order cross streams electricity, and the output signal of its sliding end connects the V2P end of electric energy computation chip (U1) after electric capacity (C5) filtering; The output signal of the CF end of described electric energy computation chip (U1) connects the pin 10 of single-chip microcomputer (U4);

B. the carrier transmitting-receiving coupled circuit is made up of coupling transformer (T), carrier signal receiving circuit and carrier signal transtation mission circuit, the primary coil of described coupling transformer (T) is connected to through electric capacity (C3) between the phase line and zero line of single-phase alternating current, and secondary coil is carried ripple signal receiving circuit and carrier signal transtation mission circuit; Described carrier signal receiving circuit by the triode that is connected into common-emitter amplifier (T5) with and collector load resistor (R7), upper offset resistance (R5), below-center offset resistance (R6), repeating resistance (R4) constitute, the base stage of triode (T5) connects coupling transformer (T) through repeating resistance (R4), the output signal of its collector connects the SIGin end of single-chip microcomputer, also is connected to two antiparallel diodes between the base stage of triode (T5) and the emitter; Described carrier signal transtation mission circuit comprises four triodes, be respectively first triode (T1), second triode (T2), the 3rd triode (T3) and the 4th triode (T4), wherein first triode (T1) and second triode (T2) are connected into the OTL power amplifier, its output terminal connects coupling transformer (T) through electric capacity (C4) and inductance (L), the complementary amplifier that the 3rd triode (T3) and the 4th triode (T4) are connected into is the promotion level of above-mentioned OTL power amplifier, and the base stage of the 3rd triode (T3) and the 4th triode (T4) connects the PSKout end of single-chip microcomputer respectively through a resaistance-capacity coupling circuit;

The pin 1～4 of c.LCD display (U5) connects the pin 53～56 of single-chip microcomputer respectively, and the pin 5～28 of LCD display (U5) connects the pin 58～33 of single-chip microcomputer respectively;

2. the single-phase IC-card carrier electric energy meter of pre-payment according to claim 1, it is characterized in that, described control relay circuit is made of magnetic latching relay (J) and bidirectional drive (U2) thereof, RON, the ROFF end of described bidirectional drive (U2) connects the pin 24 and the pin 27 of single-chip microcomputer respectively, the coil of the CKA of bidirectional drive (U2), CKB termination magnetic latching relay (J), parallel resistance (R3) on the coil of magnetic latching relay (J), its normally opened contact J-1 is series in the current supply circuit.

3. the single-phase IC-card carrier electric energy meter of pre-payment according to claim 1 and 2, it is characterized in that, set up the calibration circuit, described calibration circuit is made of photoelectrical coupler (U3), light emitting diode in the photoelectrical coupler (U3) is held through the CF that resistance (R8) connects electric energy computation chip (U1), and the output termination of photoelectric tube is proofreaied and correct electric energy meter.