CN203552355U - Single-phase and wide-range intelligent prepayment electric energy meter - Google Patents
Single-phase and wide-range intelligent prepayment electric energy meter Download PDFInfo
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- CN203552355U CN203552355U CN201320645330.7U CN201320645330U CN203552355U CN 203552355 U CN203552355 U CN 203552355U CN 201320645330 U CN201320645330 U CN 201320645330U CN 203552355 U CN203552355 U CN 203552355U
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Abstract
The utility model provides a single-phase and wide-range intelligent prepayment electric energy meter capable of meeting a requirement on wide-current-range metering. The single-phase and wide-range intelligent prepayment electric energy meter comprises an MCU (micro control unit) module and a power circuit, wherein the MCU module is connected with a carrier module and an RS485 communication port; the power circuit is connected with the carrier module and the RS485 communication port; the MCU module is also connected with an electric energy metering chip circuit, an LCD (liquid crystal display), an infrared communication port, a clock module and an ESAM (embedded secure access module) fee control encryption module; the electric energy metering chip circuit is connected with a current sampling module and a voltage sampling module. The active precision of the single-phase and wide-range intelligent prepayment electric energy meter disclosed by the utility model is up to the 1.0 level, and the current range is up to 1(80)A, so that the metering error within a current range is less than +/-0.2 percent; under a condition that a temperature coefficient is smaller than +/-150ppm/DEG C, the precision of current measurement is kept constant; conversion between the prepayment electric energy meter and a non-prepayment electric energy meter can be realized; multiple functions of electric energy data recording, remote communication and the like are realized; furthermore, the whole electric energy meter is small in size and convenient to operate.
Description
Technical field
The utility model relates to a kind of electric energy meter, especially a kind of single-phase wide-range prepaid intelligent electric energy meter.
Background technology
Current specification is an important parameter of electric energy meter, by this parameter, can reflect that an electric energy meter can measure the levels of precision of user power utilization load institute consumption of electric power, generally with fundamental current Ib/ rated current In and maximum current Imax, represents.As 5 (60) common A, 10 (40) A, 20 (80) A etc.In the company standard Q/GDW364-2009 of State Grid Corporation of China, stipulate, electric energy meter adopts direct insertion type, and maximum current is preferably fundamental current more than 4 times.Owing to serviceable life of electric energy meter being generally 10 years, during this period of time, but resident's need for electricity may be installed and within several years, occur afterwards larger growth at electric energy meter, especially in the peak electricity consumption period all occurring every year, makes maximum power load may approach the maximum current that even surpasses electric energy meter.For Electrical Safety needs, Utilities Electric Co. has to change in a large number at the beginning of serviceable life, the electric energy meter in mid-term, causes a large amount of wastings of resources.
The scope of general current specification is relevant to the dynamic range of metering section A/D sampling.For Utilities Electric Co., the computation chip dynamic range of having been put on market limits, and has to electric energy meter to stipulate more current specification, to adapt to different power load users' demand.The electric energy meter that estimated current specification is more, the resource that has strengthened Utilities Electric Co. and electric energy meter manufacturing enterprise drops into, and has increased the kind of checkout equipment and the stock of quantity and product standby redundancy, has restricted the standardized management process of core manufacturing enterprise of Utilities Electric Co..
Therefore, needing a kind of current specification to meet the demand of all users to power load, is the common demand of Utilities Electric Co. and electric energy meter enterprise.
Utility model content
The purpose of this utility model is to provide a kind of single-phase wide-range prepaid intelligent electric energy meter that can meet wide current range metering.
The single-phase wide-range prepaid intelligent electric energy meter of realizing the utility model object, comprises MCU module, and described MCU module is connected with RS485 communication port with carrier module, the power circuit being connected with RS485 communication port with carrier module; Described MCU module is also connected with electric energy computation chip circuit, LCD display, infrared communication mouth, CPU card and ESAM expense control encrypting module, and described electric energy computation chip circuit is connected with current sample module and voltage sample module.
The current range of electric energy meter can reach 1 (80) A, and in range of current error in dipping be better than ± 0.2%, at temperature coefficient, lower than ± 150ppm/ ℃ in the situation that, the degree of accuracy of current measurement remains unchanged.
Described electric energy computation chip circuit adopts the IDT90E23 that possesses wide electric current function of measuring.
Described MCU module is also connected with battery detection circuit.
Described MCU module is also connected with system power failure observation circuit.
Described MCU module is also connected with ICP circuit.
Described ESAM expense control encrypting module comprises the expense control CPU card interface of being located in MCU module, and is installed on the safety encipher chip ESAM in described expense control CPU card interface.
Described MCU module is also connected with storer.
Described MCU module is also connected with pilot lamp.
The beneficial effects of the utility model are as follows: single-phase wide-range prepaid intelligent electric energy meter of the present utility model, and meritorious precision can reach 1.0 grades; Current range can reach 1 (80) A, has realized error in dipping in range of current to be better than ± 0.2%, and at temperature coefficient, lower than ± 150ppm/ ℃ in the situation that, the degree of accuracy of current measurement remains unchanged.Can realize the conversion between prepayment meter and non-prepayment meter; Be provided with the infrared communication mouth and the storer that are connected with MCU module, realized the various functions such as energy data record, telecommunication, and whole ammeter volume be little, easy to operate, for electric energy metrical provides powerful protective capacities.
Accompanying drawing explanation
Fig. 1 is the structural representation of single-phase wide-range prepaid intelligent electric energy meter of the present utility model.
Embodiment
Embodiment of the present utility model is as follows: as shown in Figure 1, single-phase wide-range prepaid intelligent electric energy meter of the present utility model, comprise MCU module 1, described MCU module 1 is connected with RS485 communication port 4 with carrier module 3, the power circuit 2 being connected with RS485 communication port 4 with carrier module 3 is the power supply of normally working of whole electric energy meter hardware system; Described MCU module 1 is also connected with electric energy computation chip circuit 5, LCD display 8, infrared communication mouth 9, CPU card 10, clock module 15 and ESAM expense control encrypting module 11, and described electric energy computation chip circuit 5 is connected with current sample module 6 and voltage sample module 7.Described ESAM expense control encrypting module 11 comprises the expense control CPU card interface of being located in MCU module 1, and is installed on the safety encipher chip ESAM in described expense control CPU card interface.
The current range of electric energy meter can reach 1 (80) A, and in range of current error in dipping be better than ± 0.2%, at temperature coefficient, lower than ± 150ppm/ ℃ in the situation that, the degree of accuracy of current measurement remains unchanged.
Described electric energy computation chip circuit 5 adopts the IDT90E23 that possesses wide electric current function of measuring.
Described MCU module 1 is also connected with battery detection circuit 12, system power failure observation circuit 13, ICP circuit 14, storer 16 and pilot lamp 17.
Electric current and voltage sampling module is isolated electric energy meter hardware system and main electrical network, makes forceful electric power and light current separately, offers metering module and carries out signal processing.Special-purpose electric energy computation chip comprises digital signal processing module, programmable gain amplifier PGA and power offset compensation circuit, and simulation energy information is converted into the digital energy information that MCU module can read and operates, and finally by LCD display, is shown to terminal user.
The embedded control encrypting module that takes of ESAM is used as wallet in electric energy meter, and the amount of money and some other important parameter are supplemented and consumed in storage with money, have identity recognition function simultaneously, carry out bidirectional identity authentication with outside card.Can also realize the safe storage of data, the functions such as identification and authentication of the encryption and decryption of data, terminal identity.
What the computation chip of electric energy computation chip circuit adopted is the 90E23 Novel measuring chip of American I DT development, this chip has error in dipping in the dynamic range of 5000:1 and is better than ± and 0.2%, at temperature coefficient, lower than ± 150ppm/ ℃ in the situation that, the degree of accuracy of current measurement remains unchanged.Voltage sample adopts resistor network partial pressure type; The sampling of L line current adopts manganese copper diverter, copper-manganese from heat affecting while considering large electric current, 90E32 chip internal is integrated gain multiple optional (maximum gain is 24) and have the programmable gain amplifier PGA of low noise, with the copper-manganese resistance that reduces to select; Consider isolation, the sampling of N line current adopts the current transformer of 1 (80) A of customization.
Electric energy meter of the present utility model has forward and reverse active energy function of measuring, can store its data, and it is meritorious that combination can be set accordingly.Have time-sharing measurement function, active energy added up respectively by the corresponding period, storage is total, point, peak, put down, paddy electric flux.At least store total electric energy of 12 months.Can measure, record, show the operational factors such as voltage, electric current (comprising neutral line current, except mutual inductance type accesses), power, power factor of current electric energy meter.According to managerial demand, rate, period and electricity price scheme can be set voluntarily, and realize the pre paid functionality of table and the conversion of non-pre paid functionality by CPU card.
The basic parameter of electric energy meter of the present utility model is:
1. reference voltage: AC220V;
2. current specification: 1 (80) A;
3. reference frequency: 50HZ;
4. meter constant: 3200imp/kwh;
5. class of accuracy: meritorious 1 grade;
6. starting current: 0.4%Ib (4mA);
7. shunt running electric current: 0mA.
Single-phase wide-range prepaid intelligent electric energy meter of the present utility model, adopting IDT90E32 dynamic range is 5000:1 electric energy meter application-specific integrated circuits, realized the design of the wide magnitude electrical energy meter of current specification 1 (80) A, test result shows, electric energy meter, in the range of current of 20mA-80A, has the error in dipping of function electric energy to be better than ± 0.2%.Wide magnitude electrical energy meter is conducive to reduce the multiple current specification electric energy meter of current existence, thereby simplifies the production complexity of electric energy meter manufacturer, also can reduce the dead storage table of Utilities Electric Co., simplifies user management.This table has been realized the metering of forward and reverse active energy and teletransmission real-time voltage, electric current, neutral line current, power, power factor, and can realize by CPU card the switching of prepayment meter and non-prepayment meter; Also the several functions such as preset parameter, auto-breaking, automatic data logging flexibly, by infrared, RS485, carrier interface, facilitates power department to realize computer network management, is a electric energy meter product being worthy to be popularized.
Embodiment recited above is described preferred implementation of the present utility model; not scope of the present utility model is limited; design under spiritual prerequisite not departing from the utility model; various distortion and improvement that the common engineering technical personnel in this area make technical solutions of the utility model, all should fall in the definite protection domain of claims of the present utility model.
Claims (8)
1. a single-phase wide-range prepaid intelligent electric energy meter, is characterized in that: comprise MCU module, described MCU module is connected with RS485 communication port with carrier module, the power circuit being connected with RS485 communication port with carrier module; Described MCU module is also connected with electric energy computation chip circuit, LCD display, infrared communication mouth, clock module and ESAM expense control encrypting module, and described electric energy computation chip circuit is connected with current sample module and voltage sample module.
2. single-phase wide-range prepaid intelligent electric energy meter according to claim 1, is characterized in that: described electric energy computation chip circuit adopts the IDT90E23 that possesses wide electric current function of measuring.
3. single-phase wide-range prepaid intelligent electric energy meter according to claim 1 and 2, is characterized in that: described MCU module is also connected with battery detection circuit.
4. single-phase wide-range prepaid intelligent electric energy meter according to claim 1 and 2, is characterized in that: described MCU module is also connected with system power failure observation circuit.
5. single-phase wide-range prepaid intelligent electric energy meter according to claim 1 and 2, is characterized in that: described MCU module is also connected with ICP circuit.
6. single-phase wide-range prepaid intelligent electric energy meter according to claim 1 and 2, it is characterized in that: described ESAM expense control encrypting module comprises the expense control CPU card interface of being located in MCU module, and is installed on the safety encipher chip ESAM in described expense control CPU card interface.
7. single-phase wide-range prepaid intelligent electric energy meter according to claim 1 and 2, is characterized in that: described MCU module is also connected with storer.
8. single-phase wide-range prepaid intelligent electric energy meter according to claim 1 and 2, is characterized in that: described MCU module is also connected with pilot lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320645330.7U CN203552355U (en) | 2013-10-20 | 2013-10-20 | Single-phase and wide-range intelligent prepayment electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320645330.7U CN203552355U (en) | 2013-10-20 | 2013-10-20 | Single-phase and wide-range intelligent prepayment electric energy meter |
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| CN203552355U true CN203552355U (en) | 2014-04-16 |
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| CN201320645330.7U Expired - Lifetime CN203552355U (en) | 2013-10-20 | 2013-10-20 | Single-phase and wide-range intelligent prepayment electric energy meter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142414A (en) * | 2014-08-11 | 2014-11-12 | 无锡锐泰节能系统科学有限公司 | Detachable combined electricity meter |
| CN104408825A (en) * | 2014-11-28 | 2015-03-11 | 山东鲁能智能技术有限公司 | Encrypted card swiping public charging pile and charging method |
-
2013
- 2013-10-20 CN CN201320645330.7U patent/CN203552355U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142414A (en) * | 2014-08-11 | 2014-11-12 | 无锡锐泰节能系统科学有限公司 | Detachable combined electricity meter |
| CN104408825A (en) * | 2014-11-28 | 2015-03-11 | 山东鲁能智能技术有限公司 | Encrypted card swiping public charging pile and charging method |
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