CN201311451Y - High-accuracy single-phase electric meter - Google Patents
High-accuracy single-phase electric meter Download PDFInfo
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- CN201311451Y CN201311451Y CNU2008202276995U CN200820227699U CN201311451Y CN 201311451 Y CN201311451 Y CN 201311451Y CN U2008202276995 U CNU2008202276995 U CN U2008202276995U CN 200820227699 U CN200820227699 U CN 200820227699U CN 201311451 Y CN201311451 Y CN 201311451Y
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Abstract
A high-accuracy single-phase electric meter belongs to the technical field of metering, and is used to solve the metering accuracy problems of electric meters. The utility model adopts the technical scheme that the high-accuracy single-phase electric meter comprises a direct current electrical source, an electric energy metering chip, a voltage sampling circuit, a current sampling circuit, an EEPROM and an LCD (or mechanical ) display, wherein the direct current electrical source consists of a rectification bridge, a DC/DC module and an electric inductance, wherein the input end of the rectification bridge is connected with phase voltage, output voltage is connected with the input end of the DC/DC module, the output end thereof is connected with the VA end of the electric energy metering chip through the electric inductance and a T-type low-pass filter, and is connected with the VD end of the electric energy metering chip through a pi-shaped filter, the current sampling circuit, the voltage sampling circuit and the EEPROM are connected with the input port of the electric energy metering chip, and the LCD display is connected with the output port of the electric energy metering chip. The high-accuracy single-phase electric meter can effectively restrain rectification electrical source high-order harmonic interference, improves metering accuracy, and guarantees charging fairness.
Description
Technical field
The utility model relates to a kind of single-phase watt-hour meter that electric energy is measured of being used for, and belongs to field of measuring techniques.
Background technology
Electricity is the indispensable energy in industrial and agricultural production and the people's daily life, and in order to make rational planning for power consumption and collect the electricity charge, power department has been installed watt-hour meter in supply line, so that the accurate power consumption of metering user.The measuring accuracy that improves watt-hour meter is to realize fair prerequisite of chargeing.Measuring accuracy is higher because of having, continuous data is convenient to advantages such as management for electron watt-hour meter, has obtained application more and more widely.At present, the acquisition speed and the arithmetic speed that improve electric energy computation chip are further to improve the main path of electron watt-hour meter measuring accuracy, but when acquisition speed and arithmetic speed are higher, from the interference of electrical network higher hamonic wave, just become to influence the principal element of electron watt-hour meter measuring accuracy.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of high precision single-phase watt-hour meter that can effectively suppress the interference of rectifier power source higher hamonic wave is provided.
Problem of the present utility model realizes with following technical proposals:
A kind of high precision single-phase watt-hour meter is made up of direct supply, electric energy computation chip, voltage sampling circuit, current sampling circuit, EEPROM and LCD display, and described electric energy computation chip adopts CS5460A (CS5463); Described direct supply is made up of rectifier bridge, DC/DC module, inductance, the input termination phase voltage of described rectifier bridge, output voltage connects the input end of DC/DC module after filter capacitor filtering, described DC/DC module adopts MAX758, its output terminal connects the VA end of CS5460A earlier through inductance and T type low-pass filter, connect the VD end of CS5460A again through a pi type filter; Described current sampling circuit, voltage sampling circuit, EEPROM connect the input port of electric energy computation chip; Described LCD display (or mechanical type display device) connects the output port of electric energy computation chip.
Above-mentioned high precision single-phase watt-hour meter, described voltage sampling circuit is made of voltage transformer (VT) and a difference channel of being made up of resistance, electric capacity, the input termination phase voltage of voltage transformer (VT), its output signal meet differential voltage input end VIN+, the VIN-of electric energy computation chip through difference channel.
Above-mentioned high precision single-phase watt-hour meter, described current sampling circuit is made of current transformer and a difference channel of being made up of resistance, electric capacity, current transformer is connected on the phase line of single-phase alternating current, and its output signal meets difference current input end IIN+, the IIN-of electric energy computation chip through difference channel.
The utility model is that core parts are formed electric energy measurement instrument with the high speed electric energy computation chip, also can accurate measurement to instantaneous electric power, direct supply adopts the DC/DC module that the higher hamonic wave that rectifier bridge produced is isolated, can effectively suppress the rectifier power source higher hamonic wave to the interference of the A/D of electric energy computation chip conversion, computing and to the alternating voltage of gathering, the influence of current offset register, the stability that low-pass filter can further improve DC voltage is set, has guaranteed the precision of metering.The utility model can effectively suppress the rectifier power source higher hamonic wave to be disturbed, and has improved the precision of metering, has guaranteed the fairness of electric energy tariffing.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is an electric theory diagram of the present utility model;
Fig. 2 is an electrical schematic diagram.
Each label is among the figure: U1, electric energy computation chip, DC/DC, DC to DC converter, ZL, rectifier bridge, L, inductance, D stabilivolt, LCD, LCD, T, transformer, PT, voltage transformer (VT), CT, current transformer, EEPROM, storer.
The model of each integrated package is among the figure: U1 is CS5460A (CS5463), and DC/DC is MAX758, and EEPROM is IM25C040M8.
Embodiment
Referring to Fig. 2, electric energy computation chip CS5460A is a kind of high-performance electric energy measurement integrated circuit, its inner integrated two delta sigma A/D converters, high, lowpass digital filter, energy calculation unit, serial line interface, number-to-frequency converter, simulation such as register array and WatchDog Timer, digital signal processing unit, CS5460A can move under single+5V voltage, also can operation under ± 2.5V voltage, the current channel input range is 30mV or 150mV, the voltage channel input range is 150mV, and CS5460A is driving device register or LCD or light-emitting diode display directly.Its arithmetic speed height, each cycle can be gathered the operational data of 80 points, makes most of instantaneous power be mended meter, has reduced the loss of electrical network, but CS5460A is also higher to the quality requirements of direct supply.
Among Fig. 2, DC/DC is a DC to DC converter, can effectively suppress of the interference of rectifier power source higher hamonic wave to electric energy computation chip U1, resistance R 1, R2, capacitor C 2 constitute a T type low-pass filter, resistance R 3, capacitor C 3, C4 constitute a T type low-pass filter, have guaranteed the quality of digital circuit power vd and the analog power VA of electric energy computation chip U1.Resistance R 4, R5 constitute bleeder circuit, and its output signal feeds back to 4 pin of DC/DC.Partial pressure value between resistance R 14, the R15 enters 17 pin of U1, to the supply voltage monitoring, implements circuit protection.
Among Fig. 2, resistance R 6, R7, capacitor C 5, C6 constitute difference channel, and resistance R 8, R9 are repeating resistance, and C7 is a filter capacitor.In like manner, resistance R 10, R11, capacitor C 8, C9 constitute difference channel, and resistance R 12, R13 are repeating resistance, and C10 is a filter capacitor.
Principle of work:
The 220V alternating current is after transformer T step-down, rectifier bridge ZL rectification, the DC voltage that the obtains MAX758 that makes a gift to someone carries out harmonic wave and isolates, the voltage of the 7 pin output of MAX758 is sent into analog voltage input VA and the digital voltage input end VD of CS5460A behind inductance L and low-pass filter, make CS5460A get electric operate as normal.
PT is the voltage input mutual inductor of CS5460A, and sampled voltage is through R6, R7, capacitor C 5, the differentiated magnitude of voltage of C6 make a gift to someone differential voltage input end VIN+ and the VIN-of CS5460A, as the magnitude of voltage of rated output.
CT is the electric current input mutual inductor of CS5460A, and sampled voltage is through resistance R 10, R11, capacitor C 8, the differentiated magnitude of voltage of C9 make a gift to someone difference current input end IIN+ and the IIN-of CS5460A, as the current value of rated output.
The MOD of electric energy computation chip U1, CS, SDI, SDO, SCLK and INT termination EEPROM, IM25C040M8 is EEPROM, has write self-check program, the bootstrap that powers on reads in data run.The EDIR of U1, EOUT termination LCD (or machinery) display shows the metering result.
Claims (3)
1, a kind of high precision single-phase watt-hour meter is characterized in that, it is made up of direct supply, electric energy computation chip (U1), voltage sampling circuit, current sampling circuit, EEPROM and LCD display, and described electric energy computation chip (U1) adopts CS5460A or CS5463; Described direct supply is made up of rectifier bridge (ZL), DC/DC module, inductance (L), the input termination phase voltage of described rectifier bridge (ZL), output voltage connects the input end of DC/DC module after filter capacitor (C1) filtering, described DC/DC module adopts MAX758, its output terminal connects the VA end of CS5460A earlier through inductance (L) and T type low-pass filter, the VD that meets CS5460A through a pi type filter holds again; Described current sampling circuit, voltage sampling circuit, EEPROM connect the input port of electric energy computation chip (U1), and described LCD display connects the output port of electric energy computation chip (U1).
2, according to the described high precision single-phase watt-hour meter of claim 1, it is characterized in that, described voltage sampling circuit is made of voltage transformer (VT) (PT) and a difference channel of being made up of resistance, electric capacity, the input termination phase voltage of voltage transformer (VT) (PT), its output signal meet differential voltage input end VIN+, the VIN-of electric energy computation chip (U1) through difference channel.
3, according to claim 1 or 2 described high precision single-phase watt-hour meters, it is characterized in that, described current sampling circuit is made of current transformer (CT) and a difference channel of being made up of resistance, electric capacity, current transformer (CT) is connected on the phase line of single-phase alternating current, and its output signal meets difference current input end IIN+, the IIN-of electric energy computation chip (U1) through difference channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202276995U CN201311451Y (en) | 2008-12-05 | 2008-12-05 | High-accuracy single-phase electric meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202276995U CN201311451Y (en) | 2008-12-05 | 2008-12-05 | High-accuracy single-phase electric meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201311451Y true CN201311451Y (en) | 2009-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202276995U Expired - Fee Related CN201311451Y (en) | 2008-12-05 | 2008-12-05 | High-accuracy single-phase electric meter |
Country Status (1)
| Country | Link |
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| CN (1) | CN201311451Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226330A (en) * | 2013-03-27 | 2013-07-31 | 杭州绿庭照明管理有限公司 | Outdoor load switch controller |
| CN103543330A (en) * | 2013-11-11 | 2014-01-29 | 博耳(宜兴)电力成套有限公司 | High-precision circuit collection device |
| CN107315156A (en) * | 2017-08-09 | 2017-11-03 | 浙江涵普电力科技有限公司 | High-accuracy direct current standard electric energy meter |
-
2008
- 2008-12-05 CN CNU2008202276995U patent/CN201311451Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226330A (en) * | 2013-03-27 | 2013-07-31 | 杭州绿庭照明管理有限公司 | Outdoor load switch controller |
| CN103543330A (en) * | 2013-11-11 | 2014-01-29 | 博耳(宜兴)电力成套有限公司 | High-precision circuit collection device |
| CN103543330B (en) * | 2013-11-11 | 2016-01-27 | 博耳(宜兴)电力成套有限公司 | High-precision circuit collection device |
| CN107315156A (en) * | 2017-08-09 | 2017-11-03 | 浙江涵普电力科技有限公司 | High-accuracy direct current standard electric energy meter |
| CN107315156B (en) * | 2017-08-09 | 2024-04-16 | 浙江涵普电力科技有限公司 | High-precision direct-current standard electric energy meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090916 Termination date: 20131205 |