CN205246757U

CN205246757U - Electric energy meter signal acquisition metering modules

Info

Publication number: CN205246757U
Application number: CN201520798866.1U
Authority: CN
Inventors: 詹华东; 顾家春; 张强
Original assignee: Taizhou Qichen Electrical Equipment Co Ltd
Current assignee: Taizhou Xinyuan Building Energy Saving Technology Co.,Ltd.
Priority date: 2015-10-16
Filing date: 2015-10-16
Publication date: 2016-05-18
Anticipated expiration: 2025-10-16

Abstract

The utility model relates to an electric instrument field provides an electric energy meter signal acquisition metering modules for signal acquisition and electric energy measurement among the smart electric meter, including measurement chip and peripheral hardware circuit, the measurement chip is ATT7022C three -phase electric energy chip, peripheral hardware circuit includes power, voltage input unit, electric current input unit, pulse output unit and SPI communication interface circuit. The utility model discloses an electric energy meter signal acquisition metering modules has and gathers the advantage that the function is many, measuring accuracy is high, anti -electricity -theft.

Description

A kind of electric meter signal gathers metering module

Technical field

The utility model relates to electrical instrumentation field, especially the signals collecting metering module of intelligent electric meter.

Background technology

Be accompanied by the pace of progress of China's process of industrialization, industry and residential electricity consumption sharply increase, and huge supply network has brought huge challenge to management of power use unit, have brought inconvenience also to resident factory. The solution that China proposes to build " intelligent grid " in " 12 planning " for this reason, realizes electrical network, computer network, the telecommunications network integration of three networks.

Early stage electric energy meter is induction type machinery electric energy meter, and the metering accuracy of this kind of table is poor, and power consumption is large, and metering width is limited, and service life is short, can not adapt to electricity consumption client's demand and the demand of electric power enterprise reform and development. Along with the development of electronics industry, electronic electric energy meter is by customer power supply voltage and current real-time sampling, adopt special electric energy computation chip, IC design, be the smart instrumentation that integrates the functions such as electric energy metrical, data processing, telecommunication, possess the computing capability of data volume, capability of fast response and precision are high, real-time high, its design is no matter for supplier of electricity or electricity consumption side can bring good economic benefit. In electronic electric energy meter, especially, in intelligent electric meter, signals collecting metering module is the unit of core.

Summary of the invention

It is a kind of precisely efficient that the technical problem that the utility model solves is to provide, and the electric meter signal that function of measuring is many gathers metering module.

For addressing the above problem, the utility model has adopted following technical scheme:

A kind of electric meter signal gathers metering module, for signals collecting and the electric energy metrical of intelligent electric meter, comprise computation chip and peripheral hardware circuit, described computation chip is ATT7022C three-phase electrical energy computation chip, and described peripheral hardware circuit comprises power supply, voltage input block, electric current input block, pulse output unit and SPI communication interface circuit; Wherein, described power supply is for powering to computation chip, the connection alternating current circuit, one end of described voltage input block, the other end connects computation chip, described electric current input block is serially connected with in alternating current circuit, and connect described computation chip, and described pulse output unit connects CFl, CF2, CF3, the CF4 pin of ATT7022C chip, and the communication line interface of described SPI communication interface circuit connects CS, SCLK, DIN, the DOUT pin of ATT7022C chip.

Preferably, described voltage input block adopts electric resistance partial pressure type circuit, comprises resistance R 1-R3 and capacitor C 1, C2; Described resistance R 1 one end connects input live wire, one end and the output of other end contact resistance R2, capacitor C 1, another termination bias voltage REFO of described resistance R 2, the other end of capacitor C 1 connects input zero line ground connection, one termination bias voltage REFO of resistance R 3, the other end connects one end and the output of C2, the other end ground connection of capacitor C 2.

Preferably, described electric current input block adopts Differential input circuit, comprises transformer T1, resistance R 4-R7 and capacitor C 3, C4; The input of described transformer T1 connects input live wire and zero line, one end of output difference contact resistance R4 and R6, the other end contact resistance R5 of resistance R 4, one end and the output of capacitor C 3, another termination bias voltage REFO of resistance R 5; The other end of resistance R 6 connects one end and the output of capacitor C 4, resistance R 7, and the other end of capacitor C 4 connects the other end the ground connection of capacitor C 3, another termination bias voltage REFO of resistance R 7.

Further, described pulse output unit connects CFl, CF2, CF3, the CF4 pin of ATT7022C chip, and output is for the electrical energy impulse signals of calibration, and wherein, CFl pin is exported meritorious energy pulse, the pulse of CF2 pin output quadergy; When the control register that ATT7022C chip is set is selected first-harmonic table schema, the meritorious pulse of CF3 pin output first-harmonic, the pulse of CF4 pin output fundamental wave reactive power, when selected harmonic table schema, the pulse of gaining merit of CF3 pin output harmonic wave, pulse that CF4 pin output harmonic wave is idle.

Preferably, on the holding wire of described SPI communication interface, be in series with a resistance, and be provided with a decoupling capacitor at signal input part.

Further, described power supply comprises battery, PMU and AC/DC converter unit.

Electric meter signal of the present utility model gathers metering module, select the core devices of ATT7022C three-phase electrical energy computation chip as signals collecting metering module, its chip package is 44 pin QFP forms, due to its inner integrated Liao Qi road second order sigma-deltaADC, wherein three tunnels are for three-phase voltage sampling, three tunnels, for three-phase current sampling, also have the sampling of a road for neutral line current or other anti-electricity-theft parameters, very convenient to use. When its inner electric voltage observation circuit can ensure to power up with power-off, normally work, a SPI interface is provided, between convenience and outside MCU, carry out the transmission of measuring parameter and calibration parameter.

Electric meter signal of the present utility model gathers metering module, has advantages of that acquisition function is many, measuring accuracy is high, anti-electricity-theft. While measurement for the collection of electric weight, have powerful data processing operation, storage and fan-out capability, and can be connected with peripheral hardware with spi bus by serial ports, make to adopt the electric energy meter oneself power consumption of this module greatly to reduce, and inside provides software regulating meter, greatly reduce cost of human resources.

Brief description of the drawings

Fig. 1 is the structural representation that electric meter signal of the present utility model gathers an embodiment of metering module;

Fig. 2 is the peripheral circuit diagram of ATT7022C three-phase electrical energy computation chip in Fig. 1 embodiment;

Fig. 3 is the circuit diagram of voltage input block in Fig. 1 embodiment;

Fig. 4 is the circuit diagram of electric current input block in Fig. 1 embodiment.

Detailed description of the invention

In order further to understand the utility model, below in conjunction with embodiment, the utility model preferred embodiment is described, but should be appreciated that these describe just as further illustrating feature and advantage of the present utility model, instead of restriction to the utility model claim.

In conjunction with the accompanying drawings and embodiments, the utility model is further described.

As Figure 1-4, in an embodiment of the present utility model, a kind of electric meter signal gathers metering module, for signals collecting and the electric energy metrical of intelligent electric meter, comprise computation chip and peripheral hardware circuit, described computation chip is ATT7022C three-phase electrical energy computation chip, and described peripheral hardware circuit comprises power supply, voltage input block, electric current input block, pulse output unit and SPI communication interface circuit.

As shown in Figure 3, voltage input block adopts electric resistance partial pressure type circuit, comprises resistance R 1-R3 and capacitor C 1, C2; Wherein, resistance R 1 one end connects input live wire, one end and the output of other end contact resistance R2, capacitor C 1, another termination bias voltage REFO of described resistance R 2, the other end of capacitor C 1 connects input zero line ground connection, one termination bias voltage REFO of resistance R 3, the other end connects one end and the output of C2, the other end ground connection of capacitor C 2.

As shown in Figure 4, described electric current input block adopts Differential input circuit, comprises transformer T1, resistance R 4-R7 and capacitor C 3, C4; The input of described transformer T1 connects input live wire and zero line, one end of output difference contact resistance R4 and R6, the other end contact resistance R5 of resistance R 4, one end and the output of capacitor C 3, another termination bias voltage REFO of resistance R 5; The other end of resistance R 6 connects one end and the output of capacitor C 4, resistance R 7, and the other end of capacitor C 4 connects the other end the ground connection of capacitor C 3, another termination bias voltage REFO of resistance R 7.

In the present embodiment, above-mentioned bias voltage REFO is made as 2.4V.

Electrical energy pulse output signal is mainly used in calibration, and CFl is the meritorious energy pulse of output, and CF2 is the pulse of output quadergy. And by the setting to ATT7022C control register, while selecting first-harmonic table schema, CF3 is the meritorious pulse of output first-harmonic, CF4 is the pulse of output fundamental wave reactive power, and when selected harmonic table schema, CF3 is the meritorious pulse of output harmonic wave, and CF4 is the idle pulse of output harmonic wave.

Meanwhile, have 6 connecting lines between ATT7022C and peripheral hardware MCU, wherein 4 is SPI communication line interface CS, SCLK, DIN, DOUT, the reset control line of an ATT7022C, a handshake line SIG. Although the SPI read-write of ATT7022C own has very perfect verification means, but also more need to strengthen the antijamming capability of holding wire, therefore in design, SPI communication interface line should be shorter as much as possible, for the SPI signal transmission property-line around that is not interfered is wrapped. For eliminating the High-frequency Interference that receives signal, the l0Q resistance of can connecting on SPI holding wire, and add a decoupling capacitor at signal input part, and this can be similar to and form a low pass filter, and decoupling capacitor can suitably select greatly, to strengthen antijamming capability.

Consider the various requirement of design, ATT7022C peripheral hardware circuit as shown in Figure 2.

Finally, power supply comprises battery, PMU and AC/DC converter unit, has good stability and Electro Magnetic Compatibility.

The explanation of above embodiment is just for helping to understand method of the present utility model and core concept thereof. Should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.

Claims

1. an electric meter signal gathers metering module, for signals collecting and the electric energy metrical of intelligent electric meter, it is characterized in that: comprise computation chip and peripheral hardware circuit, described computation chip is ATT7022C three-phase electrical energy computation chip, and described peripheral hardware circuit comprises power supply, voltage input block, electric current input block, pulse output unit and SPI communication interface circuit; Wherein, described power supply is for powering to computation chip, the connection alternating current circuit, one end of described voltage input block, the other end connects computation chip, described electric current input block is serially connected with in alternating current circuit, and connect described computation chip, and described pulse output unit connects CFl, CF2, CF3, the CF4 pin of ATT7022C chip, and the communication line interface of described SPI communication interface circuit connects CS, SCLK, DIN, the DOUT pin of ATT7022C chip.

2. electric meter signal as claimed in claim 1 gathers metering module, it is characterized in that: described voltage input block adopts electric resistance partial pressure type circuit, comprises resistance R 1-R3 and capacitor C 1, C2; Described resistance R 1 one end connects input live wire, one end and the output of other end contact resistance R2, capacitor C 1, another termination bias voltage REFO of described resistance R 2, the other end of capacitor C 1 connects input zero line ground connection, one termination bias voltage REFO of resistance R 3, the other end connects one end and the output of C2, the other end ground connection of capacitor C 2.

3. electric meter signal as claimed in claim 1 gathers metering module, it is characterized in that: described electric current input block adopts Differential input circuit, comprises transformer T1, resistance R 4-R7 and capacitor C 3, C4; The input of described transformer T1 connects input live wire and zero line, one end of output difference contact resistance R4 and R6, the other end contact resistance R5 of resistance R 4, one end and the output of capacitor C 3, another termination bias voltage REFO of resistance R 5; The other end of resistance R 6 connects one end and the output of capacitor C 4, resistance R 7, and the other end of capacitor C 4 connects the other end the ground connection of capacitor C 3, another termination bias voltage REFO of resistance R 7.

4. electric meter signal as claimed in claim 1 gathers metering module, it is characterized in that: described pulse output unit connects CFl, CF2, CF3, the CF4 pin of ATT7022C chip, output is for the electrical energy impulse signals of calibration, wherein, the meritorious energy pulse of CFl pin output, the pulse of CF2 pin output quadergy; When the control register that ATT7022C chip is set is selected first-harmonic table schema, the meritorious pulse of CF3 pin output first-harmonic, the pulse of CF4 pin output fundamental wave reactive power, when selected harmonic table schema, the pulse of gaining merit of CF3 pin output harmonic wave, pulse that CF4 pin output harmonic wave is idle.

5. electric meter signal as claimed in claim 4 gathers metering module, it is characterized in that: on the holding wire of described SPI communication interface, be in series with a resistance, and be provided with a decoupling capacitor at signal input part.

6. the electric meter signal as described in claim 1-5 any one gathers metering module, it is characterized in that: described power supply comprises battery, PMU and AC/DC converter unit.