CN201247284Y - Electro-on-site service terminal - Google Patents

Abstract

The utility model discloses a power consumption locale service terminal, which comprises a three-phase metering chip and a function processing chip with liquid crystal to drive, wherein the three-phase metering chip is connected on the input end of the function processing chip, the function processing chip is further connected with an impulse output circuit, an LCD display circuit, a memory, an infrared communication circuit, a RS 485 circuit, a clock chip with temperature compensation, a 232 communication circuit and a GPRS communication circuit, wherein the three-phase metering chip adopts an AD73360 chip. The power consumption locale service terminal adopts a high-precision metering chip AD73360L, which leads sampling resolution factors of voltage and current to be greatly improved, improves metering precision of a distribution terminal, and can stably and reliably run in long period.

Description

The on-the-spot service terminal of electricity consumption

[technical field]

The utility model relates to the on-the-spot service terminal of the full electronic electricity consumption with long-range GPRS/SMS communication function that designs at large user's substation transformer AC sampling, automatic data logging, load remote measurement, load control and equipment on-line monitoring.

[background technology]

Power office generally is with a multifunction electric meter electricity consumption situation to be measured to big power consumption client's management now, and then the ruuning situation of multifunctional meter is monitored with the on-the-spot service terminal of electricity consumption, by cordless communication network Monitoring Data is dealt into the related system of power office, office side just judges according to these real time datas whether the electricity consumption situation ammeter work whether normal, that be used to measure at electricity consumption scene is normal.Performance requirement to the on-the-spot service terminal of electricity consumption is very high so in fact, because what it played in this system in fact is the effect of a standard scale and human observer, and relevant Monitoring Data will be transferred to wireless communication networks by it, so the requirement of reliability to it is quite high, particularly the requirement aspect computation chip, GPRS communication is all higher, and the on-the-spot service terminal measuring accuracy of present electricity consumption is relatively poor, long-play is reliable and stable inadequately.

[summary of the invention]

The purpose of this utility model solves the problems of the prior art exactly, proposes the on-the-spot service terminal of a kind of electricity consumption, can improve measuring accuracy, and can long-time reliable and stable operation.

For achieving the above object, the utility model proposes the on-the-spot service terminal of a kind of electricity consumption, the function treatment chip that comprises three phase metering chip, band liquid crystal drive, the three phase metering chip is connected the input end of function treatment chip, also be connected with clock chip, 232 communicating circuits, the GPRS communicating circuit of impulse output circuit, LCD display circuit, storer, infrared communication circuit, RS485 circuit, band temperature compensation on the function treatment chip respectively, described three phase metering chip adopts the AD73360L chip.

As preferably, described storer adopts the 24LC256I chip.

As preferably, the input end of described function treatment chip also is connected with button inputting circuits and negative phase sequence testing circuit.

As preferably, three line control circuits that described infrared communication circuit adopts an incoming line, the output line of an output 38K waveform, an output to send signal waveform.

As preferably, described RS485 circuit adopts the MAX13485 chip.

As preferably, the clock chip of described band temperature compensation adopts the DS3231 chip.

The beneficial effects of the utility model: the utility model voltage, electric current are after sample circuit is taken a sample respectively, sending into the three phase metering chip handles, and be converted into digital signal and deliver to the function treatment chip and calculate, to the storage access data, on the LCD of LCD display circuit liquid crystal, show every data, carry out the communication transmission as required by infrared communication circuit or RS485 circuit.And utilize the GPRS communicating circuit to finish the monitoring of the on-the-spot parameters of electricity consumption, the every data of recording storage.Adopt high-precision measuring chip AD73360L, make the electric current and voltage sampling resolution greatly improve, improved the measuring accuracy of the on-the-spot service terminal of electricity consumption, and can long-time reliable and stable operation.When not having external power source, the 6V battery and the 3.6V battery that utilize ammeter to carry are powered to ammeter, and the rechargeable battery that utilizes the GPRS communicating circuit to carry is powered to GPRS.

Feature of the present utility model and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.

[description of drawings]

Fig. 1 is the structural representation of the on-the-spot service terminal of the utility model electricity consumption.

[embodiment]

Consult Fig. 1, the on-the-spot service terminal of electricity consumption, the function treatment chip 2 that comprises three phase metering chip 1, band liquid crystal drive, three phase metering chip 1 is connected the input end of function treatment chip 2, also be connected with clock chip 8,232 communicating circuits 14, the GPRS communicating circuit 15 of impulse output circuit 3, LCD display circuit 4, storer 5, infrared communication circuit 6, RS485 circuit 7, band temperature compensation on the function treatment chip 2 respectively, described three phase metering chip 1 adopts the AD73360L chip, and function treatment chip 2 adopts the STR710FZ2T6 chip.The input end of described function treatment chip 2 also is connected with button inputting circuits 9 and negative phase sequence testing circuit 10.Voltage, electric current are sent into three phase metering chip 1 and are handled after sample circuit is taken a sample respectively, and are converted into digital signal and deliver to function treatment chip 2 and calculate.Owing to adopted special-purpose AD73360L chip, make the electric current and voltage sampling resolution greatly improve, improved the measuring accuracy of the on-the-spot service terminal of electricity consumption, and can long-time reliable and stable operation.Function treatment chip 2 is used for time-shared charge and handles various inputoutput datas, by serial line interface the data of special-purpose electric energy chip are read, and finish metering of timesharing active energy and maximum demand metering function according to the real-time time of clock chip 8 and the predefined period of band temperature compensation, as required to storer 5 access datas, on the LCD of LCD display circuit 4 liquid crystal, show every data, carry out the communication transmission by infrared communication circuit 6 or RS485 circuit 7, and finish the monitoring of operational factor, the various data of recording storage.Utilize the GPRS communicating circuit to finish the monitoring of the on-the-spot various parameters of electricity consumption, the various data of recording storage simultaneously.

Entire circuit adopts linear power supply 11 and battery circuit 13 by electric power management circuit 12 power supplies.Adopt linear transformer step-down mode, the hermetically sealed mode of transformer adopting, clean and tidy reliable, simultaneously because the rear end power consumption is very big, so the output power of transformer also is bigger.Because the power consumption during the GPRS emission is very big, can reach on the 1A, common stabilivolt can not be exported such electric current at all, can export the LM2576 5.0V of 3A electric current as voltage-stabilizing device so select maximum, the 5V power supply is supplied with outside the metering section, supply with related devices such as single-chip microcomputer and ARM by 3.3VLDO, by supplying with the GPRS communication module about LM29302 output 4.2V, the reason that adopts LM29302 is a module to the quality requirements of power supply than higher, what especially ripple will be absolute is little, in addition because be to 4.2V with the 5V power conversion, and suitable big of the power consumption of 4.2V power supply, can reach about 1.6A, and under such output current situation, require falling of voltage to be less than 400mA, the magnitude of voltage after falling must be greater than the module of 3.3V minimum operating voltage, so select output power big, ripple is little, and the LM29302 of low pressure reduction exports as voltage stabilizing.Because terminal only need not kept its operate as normal 3 minutes when having external power source, allow it last related data can be dealt into telecommunication network, after this only need to guarantee that the normal operation of clock is just passable, our design guarantees not have power supplies in 3 minutes behind the external power source with nickel-hydrogen chargeable cell, guarantees the power supply of clock chip DS3231 with single-unit 3.6V battery.When having external power source and Ni-MH battery electric weight not enough, BQ2507 charges to Ni-MH battery by the battery charge control chip, and charging process can be divided into precharge, rapid charge, supply charging and 4 stages of trickle charge.Adopt little pre-charge electricity when just beginning to charge, the terminal voltage of battery rises very fast, changes rapid charge when rising to 1.2V over to, and rapid charge is to use large current charge, generally adopts more than the 1C, and most of electric energy of battery recovered in this stage.In order to guarantee that battery fills people 100% electric energy, also supply charging process with regard to adding, promptly after reaching 4.2V, cell voltage enters the trickle floating charge stage, battery is safeguarded, to prevent self-discharge of battery, charge rate is generally (1/30) C, and the charging current of accumulator represents with charge rate C that usually C is the rated capacity of accumulator.For example, to the 1Ah battery charge, charge rate is exactly 2C with the 2A electric current; Similarly, to the 500mAh battery charge, charge rate is exactly 4C with the 2A electric current.We receive the front end of LM2576 5.0V with the output terminal of rechargeable battery, and the output of rechargeable battery power supply does not provide the power supply of entire equipment when having external power source.

Described storer 5 adopts the 24LC256I chip.24LC256I is the Low-Power CMOS serial EEPROM of U.S. Microchip company, it is to include 32K x 8 (256K bit) storage space, have operating voltage wide (2.5～5.5V), the fast characteristics such as (less than 5ms) of erasable (greater than 10000 times) often, writing speed.1,2,3 pin of 24LC256I are three address wires, be used for determining the hardware address of chip, the 8th pin and the 4th pin are respectively positive and negative power supply, the 5th pin SDA is the serial data I/O, data are by this two-way I2C bus serial transfer, the 6th pin SCL is the serial clock incoming line, SDA and SCL all need and positive supply between respectively connect on the resistance of a 10K and draw, the 7th pin needs ground connection.Have address register in the sheet among the 24LC256I.Whenever after writing or read a data byte, this address register adds 1 automatically, to realize the read-write to next storage unit.All bytes all read in the single operation mode.For reducing total write time, single job can write the nearly data of 8 bytes.

Three line control circuits that described infrared communication circuit 6 adopts an incoming line, the output line of an output 38K waveform, an output to send signal waveform.Infrared communication circuit 6 is divided into and transmits and receives two parts.The radiated element of radiating portion is an infrarede emitting diode, and what it sent is infrared ray rather than visible light, and the Infrared wavelength that infrarede emitting diode commonly used sends is about 940nm, the about 100mW of emissive power.The infrared receiving tube of receiving circuit is a kind of photodiode, will add reverse biased to infrared receiving diode during use, and its could operate as normal and obtain high sensitivity.Because the emissive power of infrarede emitting diode is less, the signal that infrared receiving diode is received a little less than, so receiving end will increase the high-gain amplifying circuit.No matter yet now be amateurish the making or formal product, mostly adopt the integrated reception head of finished product.The integrated head that receives of infrared ray is the module that collects infrared reception, amplification, filtering and comparer output etc., stable performance, reliable.The infrared part circuit adopts three line control circuits, i.e. output (emission) is imported (reception) and is used single line with two lines, exports one of them mouthful and utilizes timer to export the 38K ripple always, another mouthful output sends signal waveform, can be regarded as the transmission of control 38K ripple; Receive owing to adopting integrated reception head, what arrive function treatment chip 2 pins is common level, so connect with a middle fracture, begins to receive infrared data when receiving to enter after level changes to break.

The on-the-spot service terminal table of electricity consumption is because of involving time-shared charge, must use external hardware clock clock chip, should not adopt software clock, software clock causes inaccurate clock when being interfered, by the software algorithm error correction, can cause certain error, example adopts technology of error correction in a minute, makes mistakes when needing error correction in interference, can cause one minute error.Adopt external clock to adopt Philip PCF8563 in early days, the outside 32.768KHZ crystal that adopts, the external clock crystal is strict on welding technology, can only adopt the backguy technology, otherwise can cause the crystal failure of oscillation, and clock stops walking.The DS3231 chip is 3PPM for band auto thermal compensation chip at-40 ℃ ~+80 ℃ clock clocking errors, and a day error is 0.26 second every day, is 2PPM in nominal temperature, and a day error is 0.18 second every day.Produce in batches and can guarantee your office's requirement is day error at 0.2 second, can satisfy.The RX8025 that EPSON company produces, clock be ± 5PMM, and this day error is 0.4 second every day, and its precision can be adjusted, but step pitch is 3PPM, promptly is-0.5 second originally promptly 0.26 second every day, can be-0.24 second after adjustment.But its output pulse is inhomogeneous, must will amplify test period.Adopt the RX8025 outside also temperature sensor must be arranged, adopt the software mode mode to carry out temperature compensation, calculated once in general 10 minutes, compensation falls flat; Can't carry out temperature compensation under the power-off condition, clocking error is difficult to control, in operational process clock is rewritten, and has a big risk, and causes the clock disorder easily.DS3231 is little power consumption, also can carry out the clock temperature self-compensation under the power-off condition.

GPRS communicating circuit 15 adopts mobile communications network, carries out communication with the electric power terminal system; Each ammeter is determined own identity by a SIM card of going into electric system, can be equivalent to a mobile phone terminal by this number access electric power terminal system communication, has just added different networks.Adopt sonyericsson R64 module stable and reliable for performance as communication module.GR64 is the advanced wireless module that has a complete set of voice-and-data function of GSM/GPRS.Its volume extra small (only 50 x, 33 x 7.2mm), all functions all concentrate in the integrated chip; Embedded ICP/IP protocol stack makes the user can farthest shorten the R﹠D cycle of GPRS product.The GR64 module can dispose, and the external control that makes outside input, output interface provide is used more effective, thereby makes the GR64 product be more suitable for the M2M solution.

The foregoing description is to explanation of the present utility model, is not to qualification of the present utility model, any structure after the utility model simple transformation is all belonged to protection domain of the present utility model.

Claims (6)

1. the on-the-spot service terminal of electricity consumption, it is characterized in that: the function treatment chip (2) that comprises three phase metering chip (1), band liquid crystal drive, three phase metering chip (1) is connected the input end of function treatment chip (2), also be connected with clock chip (8), 232 communicating circuits (14), the GPRS communicating circuit (15) of impulse output circuit (3), LCD display circuit (4), storer (5), infrared communication circuit (6), RS485 circuit (7), band temperature compensation on the function treatment chip (2) respectively, described three phase metering chip (1) adopts the AD73360L chip.

2. the on-the-spot service terminal of electricity consumption as claimed in claim 1, it is characterized in that: described storer (5) adopts the 24LC256I chip.

3. the on-the-spot service terminal of electricity consumption as claimed in claim 1, it is characterized in that: the input end of described function treatment chip (2) also is connected with button inputting circuits (9) and negative phase sequence testing circuit (10).

4. the on-the-spot service terminal of electricity consumption as claimed in claim 1 is characterized in that: three line control circuits that described infrared communication circuit (6) adopts an incoming line, the output line of an output 38K waveform, an output to send signal waveform.

5. the on-the-spot service terminal of electricity consumption as claimed in claim 1, it is characterized in that: described RS485 circuit (7) adopts the MAX13485 chip.

6. as the on-the-spot service terminal of any one described electricity consumption in the claim 1 to 5, it is characterized in that: the clock chip of described band temperature compensation (8) adopts the DS3231 chip.

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