CN103033655A

CN103033655A - Intelligent electric energy meter with accurate timing module

Info

Publication number: CN103033655A
Application number: CN2011102932276A
Authority: CN
Inventors: 闫书芳; 陈文藻; 季飞龙; 吴懋珏; 曹晓峰; 华号; 须鹏飞
Original assignee: JIANYIN CHANGYI GROUP
Current assignee: JIANYIN CHANGYI GROUP
Priority date: 2011-10-08
Filing date: 2011-10-08
Publication date: 2013-04-10

Abstract

The invention discloses an intelligent electric energy meter with an accurate timing module. The intelligent electric energy meter with the accurate timing module comprises a microprocessor, a timing module, an embedded type safety control module, a communication module, a metering module, a data storing module and a relay. The microprocessor is respectively connected with the embedded type safety control module, the communication module, the metering module, the data storing module and the timing module. A clock circuit, a 32.768K crystal oscillator and a temperature sensor are built in the timing module. The timing module is sequentially connected with an optoelectronic isolation interface and a timing interface and is connected with a battery. The intelligent electric energy meter is provided with a high-accuracy clock signal within a large temperature range.

Description

A kind of intelligent electric energy meter with precise timing module

Technical field

The present invention relates to a kind of intelligent electric energy meter, be specifically related to a kind of intelligent electric energy meter with precise timing module.

Background technology

Intelligent electric energy meter is widely used, and microprocessor is the core of whole intelligent electric energy meter, and clock signal is the basis of microprocessor steady operation accurately.At present, microprocessor is general to adopt the 32.768K clock generator that is comprised of crystal and load capacitance, and this clock generator temperature influence is very large, and high-precision clock signal can not be provided in wide temperature range.

Summary of the invention

The object of the invention is to overcome the defective that exists in the prior art, a kind of intelligent electric energy meter with precise timing module is provided, described intelligent electric energy meter can have high-precision clock signal in wide temperature range.

For achieving the above object, technical scheme of the present invention is a kind of intelligent electric energy meter with precise timing module of design, and described intelligent electric energy meter with precise timing module comprises microprocessor, timing module, embedded safe control module, communication module, metering module, data memory module, relay, timing module; Described microprocessor is connected with embedded safe control module, communication module, metering module, data memory module, relay, timing module respectively; Described timing module onboard clock circuit, 32.768K crystal oscillator, temperature sensor.

Interface was connected when preferably, timing module was isolated with the school by photoelectricity.

Preferably, timing module is connected with battery.

Preferably, described timing module is the timing chip of model R8025T.

Microprocessor: be the core of whole intelligent electric energy meter, data acquisition, data storage, data operation, communication, control signal output, demonstration, corresponding event record etc.

Embedded safe control module: be used for the message exchange safety certification.

Communication module: be used for transmitting with the long-range electricity-selling system information of carrying out.

Metering module: be used for the metering of each related data of intelligent electric energy meter.

Data memory module: each related data that is used for the storage intelligent electric energy meter.

Relay: be used for cooperating the reclosing command of operating a switch, allow of long-range electricity-selling system to cut off the power supply, send electric control.

Timing module onboard clock circuit, 32.768K crystal oscillator, temperature sensor, the temperature variation that can record according to temperature sensor, automatically crystal oscillation frequency is compensated, make it in high-temperature region and low-temperature space crystal frequency and change very littlely, greatly improved the precision of clock signal.

Timing module during successively with photoelectricity isolation, school interface be connected, when interface carried out the school to timing module when external unit can be by the school.

Timing module is connected with battery, make the power down of intelligent electric energy meter primary power after, timing module can be battery-powered and be worked on.

Advantage of the present invention and beneficial effect are: a kind of intelligent electric energy meter with precise timing module is provided, and described intelligent electric energy meter can have high-precision clock signal in wide temperature range.

Description of drawings

Fig. 1 is theory diagram of the present invention;

Fig. 2 is the temperature curve of crystal.

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is further described.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.

The technical scheme of implementation of the present invention is:

A kind of intelligent electric energy meter with precise timing module, described intelligent electric energy meter with precise timing module comprises microprocessor, timing module, embedded safe control module, communication module, metering module, data memory module, relay, timing module; Described microprocessor is connected with embedded safe control module, communication module, metering module, data memory module, relay, timing module respectively; Described timing module onboard clock circuit, 32.768K crystal oscillator, temperature sensor; Interface was connected when timing module was isolated with the school by photoelectricity; Timing module is connected with battery.

Traditional Design Mode is the crystal oscillator of MCU circuit+clock circuit+32.768K or the crystal oscillator of the built-in RTC+32.768K of MCU circuit.The external pattern of crystal of 32.768kHz is adopted in traditional design, and temperature control unit and RTC unit be not at same position, and the compensating unit of crystal can only independently be carried out by software and thermometric like this, and error range can't realize linearization, and error amount reaches 100ppm.

The design's circuit: the encapsulation that clock circuit+32.768K crystal oscillator+temperature sensor is the integrated design.Change the Parabolic temperature curve of crystal into linear temperature curve.Independent temperature detects and the 32.768kHz crystal module is encapsulated in the unified module jointly, process crystal and curve corresponding to temperature by processor independently, like this, in-40 ℃～+ 85 ℃ scope, temperature curve is corrected between linear zone, and MCU directly reads linear temperature value for the timescale data of MCU unit.The precision of clock timing in-40 ℃～+ 85 ℃ scope reaches 3ppm, compares with the intelligent electric energy meter of the integrated RTC circuit of similar use, and precision improves 10 times.

Preferably, described timing module is the integrated timing chip of model R8025T, as shown in Figure 2, and the temperature curve of the revised crystal of 1 integrated timing chip; 2 is the initial temperature curve of the crystal of separation circuit, need to obtain by software and algorithm the offset of clocking error.

The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims

1. intelligent electric energy meter with precise timing module is characterized in that:

Described intelligent electric energy meter with precise timing module comprises microprocessor, timing module, embedded safe control module, communication module, metering module, data memory module, relay, timing module;

Described microprocessor is connected with embedded safe control module, communication module, metering module, data memory module, relay, timing module respectively;

Described timing module onboard clock circuit, 32.768K crystal oscillator, temperature sensor.

2. the intelligent electric energy meter with embedded safe control module according to claim 1 is characterized in that, interface was connected when described timing module was isolated with the school by photoelectricity.

3. the intelligent electric energy meter with embedded safe control module according to claim 1 is characterized in that, described timing module is connected with battery.

4. the intelligent electric energy meter with embedded safe control module according to claim 1 is characterized in that, described timing module is the timing chip of model R8025T.