CN2385384Y

CN2385384Y - Single phase electronic intelligent network kilowatt-hour meter

Info

Publication number: CN2385384Y
Application number: CN 99214592
Authority: CN
Inventors: 李胜利
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-05
Filing date: 1999-07-05
Publication date: 2000-06-28
Anticipated expiration: 2009-07-05

Abstract

The utility model relates to a single phase electronic intelligent network kilowatt-hour meter, which is composed of a CPU module 1, a measuring module 2, a carrier wave module 3, an electric theft proof module 4, a real-time clock module 5, an IC card module 6, a relay module 7, an LCD module 8, and a power module 9. The price of electricity in a user meter is changed by a carrier channel, a real-time clock is provided, and a multiple fee rate kilowatt-hour meter can be realized. The utility model has the advantages of good reliability, simple structure, high precision of measurement, and complete function. The utility model belongs to power measurement field.

Description

Electronic single-phase intelligent network watt-hour meter

Electronic single-phase intelligent network watt-hour meter is with the electricity price in the carrier channel change subscriber's meter, has the electric energy meter that real-time clock is realized multiple rate, belongs to the electric energy metrical field.

Though existing IC-card prepayment meter can be controlled user power utilization, make electric industry department collect the electricity charge and become initiatively by passive, it also has following shortcoming:

1. be not easy to electricity charge rise in price management;

2. the power consumption management is real-time inadequately;

3. do not answer the rate function;

4. there is not anti-stealing electricity function;

The purpose of the present utility model is to overcome the defective of existing IC-card prepayment meter, invents a kind of electronic single-phase intelligent network watt-hour meter.

The purpose of the present utility model is achieved in that it (Fig. 1) is made up of CPU module 1, metering module 2, carrier module 3, anti-electricity-theft module 4, real-time clock module 5, IC-card module 6, relay module 7,

LCD MODULE

8 and 9 nine functional modules of power module.

Its major function of metering module is a metering user institute power consumption, and sends CPU to the form of pulse.The major function of carrier module is the signal that receives characteristic frequency from low-voltage distributing line, sends CPU to after conversion, and sends on the low-voltage distributing line after the conversion of signals that CPU is sent.The function of anti-stealing electricity function module mainly is the generation that prevents individual user's stealing electricity phenomenon in use.When the user might stealing action the time, electric energy meter can be made corresponding processing.Real-time clock module is in order to realize multiple rate function, to be furnished with a real-time timepiece chip and electric power system thereof.The IC-card functional module is the most important link that sale of electricity administrative center contacts with the user, and it has a reliable and stable IC-card read/write circuit.And have anti-interference and function short-circuit protection.The CPU module is the core of whole electric energy, and it is made up of 8 highly reliable microprocessors and some peripheral circuit that carries inner watchdog circuit.Relay module adopts magnetic latching relay.LCD MODULE adopts the large scale liquid crystal display panel.Power module provides reliable assurance for the whole electric energy safe and stable operation.

Advantage of the present utility model is it with the electricity price in the carrier channel change subscriber's meter, and what solved like this that IC-card gives the paying electric energy meter is unfavorable for electricity price rise in price problem.The utlity model has real-time clock realization multiple rate truly.Simultaneously its supervisory user table running status at any time solves the stealing problem, and can monitor inquiry and purchase electric remaining sum.The utility model is simple in structure, good reliability, and the measuring accuracy height, multiple functional, be very promising product on the market.

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

Fig. 1 is a block scheme of the present utility model.The 1st, CPU module, the 2nd, metering module, the 3rd, carrier module, the 4th, anti-electricity-theft module, the 5th, real-time clock module, the 6th, IC-card module, the 7th, relay module, the 8th, LCD MODULE, the 9th, power module.

Fig. 2 is the circuit diagram of CPU module of the present utility model.

Fig. 3 is the circuit diagram of metering module of the present utility model.

Fig. 4 is the circuit diagram of carrier module of the present utility model.

Fig. 5 is the circuit diagram of anti-electricity-theft module of the present utility model.

Fig. 6 is the circuit diagram of real-time clock module of the present utility model

Annexation between each module of the utility model and the CPU is such (Fig. 2): the output of metering module 2 connects the pin two 5 of CPU, carrier module 3 connects the pin one 2,13,14,15 and 24 of CPU, anti-electricity-theft module 4 connects the pin one 6 of CPU, real-time clock module 5 connects the pin one 7,18 of CPU, IC-card module 6 connects the

7,8,9,10 and 27 of CPU, relay module 7 connects the pin two 1,22 of CPU, and LCD MODULE 8 connects the pin one 7,18 of CPU.

What the CPU microprocessor was selected for use is the COP8 series microprocessor of National Semiconductor, and this chip functions is complete, the performance height, and have SPL bus and inner house dog.As 4U2 among Fig. 2,4U3 is EEPROM, also has the SPL bus, and what the reset circuit of its CPU adopted is that the LM339 comparer is realized, and the function that LM339 also has a shaping circuit is applied in the circuit.

The main devices of metering module (Fig. 3) is 0932 chip of company of Shanghai Belling, and this chip has anti-electricity-theft and the measuring accuracy advantages of higher, as shown in Figure 3: 2R1 wherein, 2C1,2C2 constitutes potential-divider network, through 2D1,2D2,2C3,2D3,2D4,2C4,2C5 form a power-supply system and use for 0932, FLQ among the figure (shunt) is the divider resistance of a high precision micro-ohm level, with 2R2 thereafter, 2R3,2C6,2C7 composition current sampling circuit is input to 0932 1,2 bipod.SMR/SMR10 among the figure is a precision resister network, and its effect is to carry out voltage sample, 3 of input 0932,4 bipods, then, after the electric current of 0932 pair of sampling and voltage are handled, according to the difference of bearing power, the pulse square wave (dutycycle is 1: 1) of output different frequency.This pulse square wave after 2U2 carries out the photoelectricity isolation, is received the electric energy meter test port, with standby again, after 2U3 photoelectricity is isolated, connect LED pulse pilot lamp and be transported to the I/O mouth of CPU, the 2R21 among the figure is arranged, 2R10 again, 2R11,2R12,2R13,2R14,2R15,2R16 resistance is used for the accommodometer accuracy of measurement.

Core in the carrier module (Fig. 4) is 7536 chips (3U1) of ST company, ST7536 is the synchronous FSK-MODEM of half-duplex, the interface that is used for line of electric force and microprocessor, it has 4 different channels and 2 different data rates (600 and 1200 baud rates, our usefulness be 1200 baud rates), this part circuit also comprises a transmission amplifying circuit and a reception amplifying circuit, all realize (3U2 and 3U3) with NE5532, sending amplification circuits, in order to guarantee that signal sends power, there are two push-pull type power tube TIP31 and TIP32 to realize power amplification (3T6 and 3T7) again.Realize the coupling of signal with a coupling transformer (3BY1) at the interface of power amplifier and line of electric force.The inferior coil of coupling transformer is divided into two groups, wherein is used to send the inferior coil of signal and the turn ratio of primary winding is 1: 1, and being used for the inferior coil of received signal and the turn ratio of primary winding is 4: 1.When receiving, signal there is higher sensitivity with assurance.In this module by 3R6,3R7,3R8,3R9,3R10 and 3T1,3T2,3T3,3T4,3T5 constitutes an on-off circuit, only to guarantee that when CPU sent data, this power amplifier part power supply was just opened, transmitting time is very short, be less than 3 seconds, transmission finishes, and switch disconnects to cut off the electricity supply, to reduce the power consumption of electric energy meter itself.

The core of anti-electricity-theft module (Fig. 5) circuit is a photosensitive tube (to pipe) 6U1, and its major function is that electricity filching behavior is made suitable processing.

Real-time clock module (Fig. 6) also is the PCF8563 (U1) that adopts PHILIPS Co., this chip has the 12C bus interface, and can solve Y2K problem, for the precision that guarantees clock meets national standard, adopt the adjustable condenser (CC1) of a high precision high reliability, regulate the precision of clock crystal, in addition clock circuit also have powered battery and charging circuit (by D1, D2, D3, R9, the B1-battery constitutes) and clock verification output circuit (by 4R10,4R30,4R29,4C13,4T3,4U6 forms).

Claims

A kind of electronic single-phase intelligent network watt-hour meter, it has IC-card module 6, relay module 7, LCD MODULE 8, power module 9, it is characterized in that it also has CPU module 1, metering module 2, carrier module 3, anti-electricity-theft module 4 and real-time clock module 5; The output of metering module 2 connects the pin two 5 of CPU, carrier module 3 connects the pin one 2,13,14,15 and 24 of CPU, anti-electricity-theft module 4 connects the pin one 6 of CPU, real-time clock module 5 connects the pin one 7,18 of CPU, IC-card module 6 connects the pin 7,8,9,10 and 27 of CPU, relay module 7 connects the pin two 1,22 of CPU, and LCD MODULE 8 connects the pin one 7,18 of CPU.