CN202196118U - Stepped billing electric energy meter - Google Patents
Stepped billing electric energy meter Download PDFInfo
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- CN202196118U CN202196118U CN2011200745143U CN201120074514U CN202196118U CN 202196118 U CN202196118 U CN 202196118U CN 2011200745143 U CN2011200745143 U CN 2011200745143U CN 201120074514 U CN201120074514 U CN 201120074514U CN 202196118 U CN202196118 U CN 202196118U
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- circuit
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- electric energy
- energy meter
- metering
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Abstract
The utility model relates to a stepped billing electric energy meter. Circuits of the electric energy meter include a power supply circuit, a metering circuit, a communication circuit and an MCU circuit, wherein the power supply circuit comprises three independent circuits including an MCU power supply circuit, a metering power supply circuit and an RS485 communication power supply circuit; the metering circuit includes a metering chip circuit communicated with an MCU, as well as a tested voltage pick-up circuit and a tested circuit pick-up circuit connected with the metering chip circuit respectively; the communication circuit includes a communication channel switching circuit bidirectionally communicated with the MCU as well as an RS485 communication passage and an infrared communication passage bidirectionally connected with the communication channel switching circuit respectively; and the MCU circuit includes a battery undervoltage detection circuit, a system power-down detection circuit and an I2C bus circuit connected with the MCU respectively, as well as an ICP circuit bidirectionally connected with the MCU. The stepped billing electric energy meter device has reasonable structure, strong anti-interference performance, safety and reliability in use, and accuracy in metering.
Description
Technical field
The utility model relates to a kind of power measurement device, specifically, relates to a kind of prepayment meter.
Background technology
Existing pre-paying kilowatt-hour meter comprises contact cassette and contactless two kinds.Wherein, contact cassette ammeter is by variety of ways such as magnetic card, electricity card and CPU cards, and its principal feature is to combine with the plug-in card machine through various cards, and transmission information is each other accomplished message exchange.The occasion that contact cassette ammeter is used in civilian single-phase circuit system mostly, is convenient to carry out the plug-in card operation.Yet; For the big three-phase supply of use amount, ammeter is loaded in the metering cabinet, power distribution cabinet of sealing, and metering cabinet, power distribution cabinet also possibly be installed on the high-tension electricity line source or the electric pole eminence nearby; Contact cassette ammeter all has difficulties on operation, safety and electricity bill control, and measures inaccurate.Contactless ammeter adopts means transmission ammeter information such as infrared signal mostly, can realize remote copying, but its poor anti jamming capability, and transmission reliability receives bigger restriction, and owing to be interfered, measures inaccurate.
The utility model content
The purpose of the utility model is to have above-mentioned deficiencies such as anti-interference is poor, metering is inaccurate to existing prepayment meter, and the pre-payment step electricity price electric energy meter of a kind of strong interference immunity, accurate measurement is provided.
The technical scheme of the utility model is: a kind of pre-payment step electricity price electric energy meter; Described electric energy meter circuit comprises power circuit, metering circuit, communicating circuit and MCU circuit, and described power circuit comprises independently circuit of three of MCU power circuits, metering power circuit and RS485 communication power supply circuit; Described metering circuit comprises a computation chip circuit that is connected with MCU, and the tested voltage pick-up circuit and the circuit-under-test pick-up circuit that are connected respectively at the computation chip circuit; Described communicating circuit comprise with the communication channel commutation circuit of the two-way UNICOM of MCU and respectively with two-way RS485 communication channel that is connected of communication channel commutation circuit and infrared communication passage; Described MCU circuit comprises battery undervoltage detection circuit, system's power-fail detection circuit and the I2C bus circuit that is connected with MCU respectively, and with the two-way ICP circuit that is connected of MCU.
Preferably; Described I2C bus circuit comprises that I2C bus, temperature sensor, real-time clock, storer, LCD drive display device; Temperature sensor, real-time clock, storer, LCD drive display device and are connected with MCU is two-way through the I2C bus respectively, and LCD drives display device and comprises lcd driver and the LCD display that is connected with lcd driver.
Preferably, in the described power circuit, metering power circuit and RS485 communication power supply circuit be the mu balanced circuit for being made up of step-down, rectification, voltage stabilizing and filtering four parts all; The MCU power circuit comprises a mu balanced circuit, fast powering-up circuit and real-time clock feed circuit.
Preferably; Described computation chip circuit comprises computation chip; And the voltage channel circuit that is connected with computation chip respectively, current channel circuit, filter circuit and interface circuit; The voltage channel circuit is a bleeder circuit through electric resistance partial pressure, and the current channel circuit is a programmable differential operational amplifying circuit of PGA, and interface circuit is connected with MCU through optocoupler.
Preferably, described current channel circuit also is provided with the anti alias filter circuit, and this anti alias filter circuit is made up of two low-pass first order filters.
Preferably, described infrared communication passage comprises radiating circuit and receiving circuit, and receiving circuit is infrared receiving integrate circuit.
Preferably, described RS485 communication channel is connected with the RS485 bus circuit with the MCU circuit respectively through optocoupler.
Preferably, described MCU circuit also comprises an indicator light circuit that is connected with MCU, and this indicator light circuit comprises peak indicating circuit, paddy indicating circuit and communication indicating circuit.
Preferably, described MCU selects 89LPC931 or 922 two kinds of single-chip microcomputers for use.
The beneficial effect of the utility model is: rational in infrastructure, the strong anti-interference performance of the utility model; Safe and reliable, accurate measurement is provided with independently circuit of three of MCU power circuits, metering power circuit and RS485 communication power supply circuit; Make metering circuit; The power supply of RS485 communication and MCU is isolated each other, reaches the purpose that is independent of each other, and has improved anti-interference, the reliability of ammeter.The utility model passes through electric resistance partial pressure; Can adjust the size of signal voltage within the specific limits, guarantee that signal voltage is in the scope of its work in the voltage channel, the verification electric energy is exported the frequency of pulse; The precision of adjustment ammeter; Through the high fdrequency component of anti alias filter filtering current channel, and the error that causes of the imbalance of compensating current signal own, the accuracy of ammeter metering improved; And two communication channel realization telecommunication networks are checked meter.
Description of drawings
Accompanying drawing 1 is the structured flowchart of the utility model specific embodiment.
Accompanying drawing 2 is the circuit theory diagrams of mu balanced circuit in the utility model MCU power circuit.
Accompanying drawing 3 is the circuit theory diagrams of fast powering-up circuit in the utility model MCU power circuit.
Accompanying drawing 4 is the circuit theory diagrams of real-time clock feed circuit in the utility model MCU power circuit.
Accompanying drawing 5 is the circuit theory diagrams of the utility model voltage channel circuit.
Accompanying drawing 6 is the circuit theory diagrams of the utility model current channel circuit.
Embodiment
The embodiment of the utility model: shown in Fig. 1 to 6: a kind of pre-payment step electricity price electric energy meter, described electric energy meter circuit comprises power circuit, metering circuit, communicating circuit and MCU circuit.Power circuit comprises independently circuit of three of MCU power circuits, metering power circuit and RS485 communication power supply circuit; Metering power circuit and RS485 communication power supply circuit be the mu balanced circuit for being made up of step-down, rectification, voltage stabilizing and filtering four parts all; The MCU power circuit comprises a mu balanced circuit, fast powering-up circuit and real-time clock feed circuit.Metering circuit comprises a computation chip circuit that is connected with MCU, and the tested voltage pick-up circuit and the circuit-under-test pick-up circuit that are connected respectively at the computation chip circuit; The computation chip circuit comprises computation chip; And the voltage channel circuit that is connected with computation chip respectively, current channel circuit, filter circuit and interface circuit; The voltage channel circuit is a bleeder circuit through electric resistance partial pressure; The current channel circuit is a programmable differential operational amplifying circuit of PGA, and interface circuit is connected with MCU through optocoupler.Communicating circuit comprise with the communication channel commutation circuit of the two-way UNICOM of MCU and respectively with two-way RS485 communication channel that is connected of communication channel commutation circuit and infrared communication passage; The current channel circuit also is provided with the anti alias filter circuit, and this anti alias filter circuit is made up of two low-pass first order filters; The infrared communication passage comprises radiating circuit and receiving circuit, and receiving circuit is infrared receiving integrate circuit; The RS485 communication channel is connected with the RS485 bus circuit with the MCU circuit respectively through optocoupler.The MCU circuit comprises battery undervoltage detection circuit, system's power-fail detection circuit and the I2C bus circuit that is connected with MCU respectively, and with the two-way ICP circuit that is connected of MCU.The I2C bus circuit comprises that I2C bus, temperature sensor, real-time clock, storer, LCD drive display device; Temperature sensor, real-time clock, storer, LCD drive display device and are connected with MCU is two-way through the I2C bus respectively, and LCD drives display device and comprises lcd driver and the LCD display that is connected with lcd driver.The MCU circuit also comprises an indicator light circuit that is connected with MCU, and this indicator light circuit comprises peak indicating circuit, paddy indicating circuit and communication indicating circuit.MCU selects 89LPC931 or 922 two kinds of single-chip microcomputers for use.
In the MCU power circuit; The principle of work of mu balanced circuit is: through the AC power of electrical network input 220V; Through transformer TR1 step-down; In the AC power of 5,6 ends generation 12V,, produce a direct current that has certain flutter component through AB1 full-wave rectification integrated package and by the differential filtering network filtering that C1, TR2, C2, E1 constitute.Through parallel voltage-stabilizing integrated circuit LM317, adjust the ratio of R1, R2 simultaneously again, obtain the required voltage value.The principle of work of fast powering-up circuit is: utilize the MAX809 power monitoring chip, when the power supply that powers on reached the voltage threshold, power channel was opened in the conducting of T1 triode, reaches the purpose of MCU fast powering-up.The principle of work of real-time clock feed circuit is: when the electrical network normal power supply, the voltage of V3.9 is 3.9V, and greater than cell voltage, because the effect of VD1 device, VDD selects the power supply of V3.9 power supply; When grid power blackout, because the effect of VD1 device, VDD selects battery power, and battery is supplied power to clock chip through the R7 current limliting simultaneously; The battery voltage detection network is arranged in the circuit, detect network and is made up of R5, R6 and C10, because R5, R6 are far longer than R7, so can ignore the influence of R7, the electric current that detects network is zero no better than, also the energy of consuming cells not.
In the metering circuit, the voltage channel circuit is actually a bleeder circuit, through electric resistance partial pressure, guarantees that signal voltage is in the scope of its work in the ADE7755 voltage channel.Because the actual environment of pre-payment step electricity price electric energy meter work and the error of component parameters; In the voltage attenuation network; Design a resistance adjustment network, can adjust the size of signal voltage within the specific limits, the frequency of verification ADE7755 electric energy output pulse; The precision of adjustment pre-payment step electricity price electric energy meter, so the voltage attenuation network is claimed the verification network again.The current channel circuit is a programmable differential operational amplifying circuit of PGA, and peripheral circuit mainly is an anti alias filter, forms the high fdrequency component of filtering current channel by two low-pass first order filters that R27, C19 and R28, C21 form.C20 selects the system that whether acts on through the JL1 wire jumper, and it is that the imbalance of compensating current signal own causes ADE7755 metering electric energy bigger error to occur, and the people is for causing imbalance, and the system that makes reaches the purpose of balance.DVDD and AVDD link together through the filtering circuit that C22, R23, R29 form, and AGND and DGND link together filtering interfering through inductance simultaneously.Select the internal reference power supply, add a filter capacitor C24, strengthen internal reference and do not receive external interference at the reference power supply output terminal.The interface circuit of ADE7755 chip mainly is the output pulse of CF pin and the electric energy direction indication of REVP pin, and isolates output through light lotus root device and MCU circuit.
Claims (9)
1. pre-payment step electricity price electric energy meter; It is characterized in that: described electric energy meter circuit comprises power circuit, metering circuit, communicating circuit and MCU circuit, and described power circuit comprises independently circuit of three of MCU power circuits, metering power circuit and RS485 communication power supply circuit; Described metering circuit comprises a computation chip circuit that is connected with MCU, and the tested voltage pick-up circuit and the circuit-under-test pick-up circuit that are connected respectively at the computation chip circuit; Described communicating circuit comprise with the communication channel commutation circuit of the two-way UNICOM of MCU and respectively with two-way RS485 communication channel that is connected of communication channel commutation circuit and infrared communication passage; Described MCU circuit comprises battery undervoltage detection circuit, system's power-fail detection circuit and the I2C bus circuit that is connected with MCU respectively, and with the two-way ICP circuit that is connected of MCU.
2. pre-payment step electricity price electric energy meter as claimed in claim 1; It is characterized in that: described I2C bus circuit comprises that I2C bus, temperature sensor, real-time clock, storer, LCD drive display device; Temperature sensor, real-time clock, storer, LCD drive display device and are connected with MCU is two-way through the I2C bus respectively, and LCD drives display device and comprises lcd driver and the LCD display that is connected with lcd driver.
3. pre-payment step electricity price electric energy meter as claimed in claim 2 is characterized in that: in the described power circuit, metering power circuit and RS485 communication power supply circuit be the mu balanced circuit for being made up of step-down, rectification, voltage stabilizing and filtering four parts all; The MCU power circuit comprises a mu balanced circuit, fast powering-up circuit and real-time clock feed circuit.
4. pre-payment step electricity price electric energy meter as claimed in claim 1; It is characterized in that: described computation chip circuit comprises computation chip; And the voltage channel circuit that is connected with computation chip respectively, current channel circuit, filter circuit and interface circuit; The voltage channel circuit is a bleeder circuit through electric resistance partial pressure, and the current channel circuit is a programmable differential operational amplifying circuit of PGA, and interface circuit is connected with MCU through optocoupler.
5. pre-payment step electricity price electric energy meter as claimed in claim 4 is characterized in that: described current channel circuit also is provided with the anti alias filter circuit, and this anti alias filter circuit is made up of two low-pass first order filters.
6. pre-payment step electricity price electric energy meter as claimed in claim 1 is characterized in that: described infrared communication passage comprises radiating circuit and receiving circuit, and receiving circuit is infrared receiving integrate circuit.
7. pre-payment step electricity price electric energy meter as claimed in claim 1 is characterized in that: described RS485 communication channel is connected with the RS485 bus circuit with MCU respectively through optocoupler.
8. pre-payment step electricity price electric energy meter as claimed in claim 1 is characterized in that: described MCU circuit also comprises an indicator light circuit that is connected with MCU, and this indicator light circuit comprises peak indicating circuit, paddy indicating circuit and communication indicating circuit.
9. like any described pre-payment step electricity price electric energy meter of claim 1 to 8, it is characterized in that: described MCU selects 89LPC931 or 922 two kinds of single-chip microcomputers for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200745143U CN202196118U (en) | 2011-03-21 | 2011-03-21 | Stepped billing electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200745143U CN202196118U (en) | 2011-03-21 | 2011-03-21 | Stepped billing electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202196118U true CN202196118U (en) | 2012-04-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200745143U Expired - Fee Related CN202196118U (en) | 2011-03-21 | 2011-03-21 | Stepped billing electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202196118U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529290A (en) * | 2012-11-02 | 2014-01-22 | 国家电网公司 | Three-phase intelligent meter capable of acquiring information of power distribution and power utilization |
| CN104316114A (en) * | 2014-11-21 | 2015-01-28 | 国家电网公司 | Intensive type touch screen intelligent power meter |
| CN104678314A (en) * | 2015-02-11 | 2015-06-03 | 宁波三星电气股份有限公司 | Method for monitoring power consumption of energy meter battery |
| CN106443102A (en) * | 2016-10-31 | 2017-02-22 | 宁波三星医疗电气股份有限公司 | Power supply distribution system for twin-core electric energy meter |
| CN106597088A (en) * | 2016-10-31 | 2017-04-26 | 宁波三星医疗电气股份有限公司 | Power source distribution system of dual-core electric energy meter |
-
2011
- 2011-03-21 CN CN2011200745143U patent/CN202196118U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529290A (en) * | 2012-11-02 | 2014-01-22 | 国家电网公司 | Three-phase intelligent meter capable of acquiring information of power distribution and power utilization |
| CN104316114A (en) * | 2014-11-21 | 2015-01-28 | 国家电网公司 | Intensive type touch screen intelligent power meter |
| CN104678314A (en) * | 2015-02-11 | 2015-06-03 | 宁波三星电气股份有限公司 | Method for monitoring power consumption of energy meter battery |
| CN106443102A (en) * | 2016-10-31 | 2017-02-22 | 宁波三星医疗电气股份有限公司 | Power supply distribution system for twin-core electric energy meter |
| CN106597088A (en) * | 2016-10-31 | 2017-04-26 | 宁波三星医疗电气股份有限公司 | Power source distribution system of dual-core electric energy meter |
| CN106443102B (en) * | 2016-10-31 | 2019-03-26 | 宁波三星医疗电气股份有限公司 | A kind of power distribution system for twin-core electric energy meter |
| CN106597088B (en) * | 2016-10-31 | 2019-05-17 | 宁波三星医疗电气股份有限公司 | A kind of power distribution system of twin-core electric energy meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120418 Termination date: 20150321 |
|
| EXPY | Termination of patent right or utility model |