CN203084073U - Isolation type SPI bus electric energy metering module and multifunctional ammeter - Google Patents
Isolation type SPI bus electric energy metering module and multifunctional ammeter Download PDFInfo
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- CN203084073U CN203084073U CN 201220278713 CN201220278713U CN203084073U CN 203084073 U CN203084073 U CN 203084073U CN 201220278713 CN201220278713 CN 201220278713 CN 201220278713 U CN201220278713 U CN 201220278713U CN 203084073 U CN203084073 U CN 203084073U
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Abstract
Disclosed in the utility model is an isolation type SPI bus electric energy metering module that comprises a diverter, a resistance divider, a single-phase metering circuit, an SPI optical isolation circuit and the like. The module can be packaged into an insulated body and the diverter is installed outside the insulated body, thereby realizing the collection and metering of single-phase electrical parameters. In addition, the utility model also discloses a three-phase three-wire or three-phase four-wire multifunctional ammeter that is formed by three or four isolation type SPI bus electric energy metering modules, an SPI communication bus, and a microprocessing circuit. According to the utility model, the modularization design is employed; and the diverter, the resistance divider, the optical isolation circuit, and the SPI communication bus are utilized. The advantages of good isolation, high anti-interference capability, high measuring precision, simple structure, and convenient production, testing and maintenance are realized.
Description
Technical field
The present invention relates to a kind of voltage, electric current and power-measuring device, especially a kind of multi-functional single-phase slotted line voltage, electric current, and calculate instantaneous voltage and current effective value (RMS), the isolation spi bus electric energy metrical module of meritorious, idle and applied power; And by the three-phase three-wire system of 3 or 4 separate isolation spi bus electric energy metrical module compositions, the multifunction electric meter that three-phase four-wire system band neutral line current is measured.
Background technology
The multifunction electric meter that current domestic and international known three-phase four-wire system band neutral line current is measured, the main monolithic electricity metering circuit chip that adopts, gather each phase current mutual inductor CT secondary voltage with through the line voltage of electric resistance partial pressure, measure instantaneous line voltage, phase current, and further calculate the phase differential of voltage, electric current, and the effective value (RMS) of line voltage and phase current, meritorious, idle and applied power, accumulative total electric weight etc.
What particularly point out is: the multifunction electric meter that known three-phase four-wire system band neutral line current is measured, and be different from single function and gather line voltage, phase current, only calculate the ammeter of electric power accumulative total electric weight, be improvement to this class ammeter.But because the ammeter that known multi-functional three-phase four-wire system band neutral line current is measured, be to adopt each phase current mutual inductor CT and monolithic electricity metering circuit chip to gather line voltage, the electric current of each phase, therefore need to isolate the high voltage between each phase line, and prevent that high voltage from damaging monolithic electricity metering circuit chip.The general current transformer CT that adopts carries out the electrical isolation phase voltage, and employing zero line (N) is as the reference potential ground wire of monolithic electricity metering circuit chip, the circuit board of whole ammeter is for reference to current potential with zero line (N), be not with phase voltage (high voltage), be convenient to meter circuit plate calibration and maintenance in process of production.
The multifunction electric meter that the three-phase four-wire system band neutral line current of known employing current transformer CT is measured mainly makes up structure, referring to accompanying drawing 1.
Wherein: four current transformer CT elementary is serially connected in respectively in three phase lines and the zero line, also be provided with resistor voltage divider circuit between elementary end of current transformer CT and the zero line, secondary and the resistor voltage divider circuit of mutual inductor connects with monolithic electricity metering circuit chip, measure parameters such as each phase line current, line voltage by monolithic electricity metering circuit chip, and calculate instantaneous line voltage and phase current effective value (RMS), parameter such as meritorious, idle and applied power.
The multifunction electric meter that above-mentioned known three-phase four-wire system band neutral line current is measured adopts current transformer CT, resistor voltage divider circuit to measure each phase current, line voltage.This structure frame mode of this ammeter can't carry out the high-precision measurement of big electric current (especially more than the 50A); And current transformer CT self is an inductive load, and there are certain phase difference in voltage, the current signal of its output, influence measuring accuracy; Because metering circuit is installed on the circuit board, there are defectives such as electrical isolation is unreliable, anti-electromagnetic interference capability is more weak simultaneously, and are not easy to test and maintenance.
Summary of the invention
The invention provides a kind of single-phase isolation spi bus electric energy metrical module, this module is a kind of safe insulation body, body interior has electric metering circuit, light isolation spi bus and interface circuit, light is isolated the external interface pin, this external installation divertor, realize the shunt collection and the metering of single-phase electricity parameter, be called for short: isolate spi bus electric energy metrical module.And, realize the three-phase three-wire system of shunt electric quantity acquisition, the multifunction electric meter that three-phase four-wire system band neutral line current is measured by 3 or 4 single-phase isolation spi bus electric energy metrical modules and micro-processor interface circuit.
As shown in Figure 2, isolation spi bus electric energy metrical module of the present invention is by divertor Rg, resitstance voltage divider, single-phase metering circuit, the SPI optically coupled isolation circuit is formed, the two ends of described divertor Rg respectively with single-phase metering circuit signal input part V1p, V1n connects, resitstance voltage divider is formed by resistance R 7 and resistance R n serial connection, one end of resistance R 7 is connected with the end of divertor Rg, and be connected with the signal input part V2n of single-phase metering circuit or be connected with the signal input part V2n of single-phase metering circuit by resistance R 8, the intermediate ends of resistance R 7 and resistance R n is connected with the signal input part V2p of single-phase metering circuit, the signal input of single-phase metering circuit, output terminal is connected with the SPI optically coupled isolation circuit, and described SPI optically coupled isolation circuit is with the input of single-phase metering electric weight, output signal is isolated the back through light and is inserted spi bus.
Wherein, divertor Rg generally selects aldary resistance for use, preferred manganin manganin alloy resistance.
The electric principle schematic of isolating spi bus electric energy metrical module is referring to accompanying drawing 3, and wherein Rg is a divertor, and resistance R 7, R6, R5 form resitstance voltage divider, wherein R6, R5 are concatenated into Rn, and IC1 is single-phase metering circuit, and IC2 is the SPI optically coupled isolation circuit.Isolate both electric current, the voltage on the energy measurement phase line of spi bus electric energy metrical module in order to make, the electric current on the energy measurement zero line can increase a switch SW in resitstance voltage divider again, switch SW and resistance R n series connection W.Switch SW is used to measure phase current, voltage when closed, switch SW is used to measure neutral line current when disconnecting.
In order to realize isolating the modularization production of spi bus electric energy metrical module, can be with in the integrated insulating body that is encapsulated in electric insulation of resitstance voltage divider resistance R 7 and Rn and switch SW, single-phase metering circuit, SPI optically coupled isolation circuit, form a thick film circuit, one side of thick film circuit is drawn three terminals, first terminals 1, second terminals, 2 outer meeting resistance shunt Rg, the 3rd terminals 3 are connected with an end of resitstance voltage divider, SPI optically coupled isolation circuit and interface pin are installed in the opposite side of thick film circuit, form the standalone module of incorporate a, miniaturization.Wherein, the resistance of divertor Rg can be selected according to the size of current of circuit under test.Here, Rg is external with divertor, and the divertor of being convenient to select different resistances especially satisfies the measurement of big electric current to be suitable for the requirement of different measures ranges.Switch SW can be encapsulated in the electric insulation body, and this is external also can be installed in electric insulation.Electronic devices and components in the insulating body can be arranged in order by sampling circuit (divertor, resitstance voltage divider), single-phase metering electric weight, optically coupled isolation circuit, and the realization high pressure separates with low pressure.When being encapsulated in the electric insulation body, switch SW is set to closure or disconnection in advance.The profile three-view diagram of isolating spi bus electric energy metrical module is referring to accompanying drawing 5.
During use, isolate spi bus electric energy metrical module and both can be used for measuring the electrical quantity (parameters such as voltage, electric current, power) of phase line, also can be used to measure the electric current of zero line.When measuring the electrical quantity of phase line, divertor Rg is serially connected in the phase line of circuit to be measured, and the zero line N of circuit under test is connected with an end of resitstance voltage divider, and switch SW is set to closure.During the metering neutral line current, divertor Rg is serially connected in the zero line of circuit to be measured, and switch SW is set to disconnect.
The multifunction electric meter that the present invention also provides a kind of three-phase four-wire system band neutral line current to measure.
The multifunction electric meter that this three-phase four-wire system band neutral line current is measured, by four aforesaid isolation spi bus electric energy metrical modules, the SPI communication bus, micro-processor interface circuit is formed, wherein isolate spi bus electric energy metrical module U11 for three, U12, the divertor Rg of U13 is serially connected in respectively in three phase lines of circuit to be measured, the end of the resistance R n of resitstance voltage divider is connected with zero line, the divertor Rg that another is isolated spi bus electric energy metrical module U14 is serially connected in the zero line, one end of resitstance voltage divider is connected with arbitrary phase line, and described micro-processor interface circuit is connected by the SPI communication bus with four isolation spi bus electric energy metrical modules.
Accompanying drawing 6 is the electric principle schematic of the multifunction electric meter of three-phase four-wire system band neutral line current measurement.Supply transformer is a three-phase four-wire system, and A, B, C have with zero line N and independently isolate spi bus electric energy metrical module separately, and are connected with micro-processor interface circuit by the SPI communication bus, is built into the multifunction electric meter that three-phase four-wire system band neutral line current is measured.Wherein isolate electrical quantitys such as the corresponding separately instantaneous line current of measuring A, B, C phase of spi bus electric energy metrical module U11, U12, U13, line voltage for 3, and further calculating voltage, current effective value (RMS), parameters such as meritorious, idle and applied power, another is isolated spi bus electric energy metrical module U14 and measures electric current on the zero line.Micro-processor interface circuit generally includes microprocessor and peripheral communication interface circuit, data storage circuitry and feed circuit.
The present invention also provides a kind of three-phase three-wire system multifunction electric meter.
This three-phase three-wire system multifunction electric meter, by three aforesaid isolation spi bus electric energy metrical modules, the SPI communication bus, micro-processor interface circuit is formed, described three divertor Rg that isolate spi bus electric energy metrical module U11, U12, U13 are serially connected among three phase line A, B of circuit to be measured, the C successively, one end of resitstance voltage divider is connected with three phase line B, C, A successively, and described micro-processor interface circuit is connected by the SPI communication bus with three isolation spi bus electric energy metrical modules.
Accompanying drawing 8 is for making up the electric principle schematic of three-phase three-wire system multifunction electric meter.Wherein 3 isolate spi bus electric energy metrical module U11, U12, U13 are corresponding separately measures electrical quantitys such as A, B, the instantaneous phase current of C, phase voltage, and further calculating voltage, current effective value (RMS), parameters such as meritorious, idle and applied power.Micro-processor interface circuit generally includes microprocessor and peripheral communication interface circuit, data storage circuitry and feed circuit.
Certainly, utilize the method for the multifunction electric meter of the measurement of isolation spi bus electric energy metrical module of the present invention and aforementioned structure three-phase four-wire system band neutral line current, three-phase three-wire system, can make up single-phase multifunctional ammeter, two-phase multifunction electric meter easily.
The invention provides the module of electrical quantitys such as a kind of metering current, voltage, power, and the multifunction electric meter that utilizes this module construction.The present invention has the following advantages.
Adopted modular design, and be encapsulated in the insulating body, high pressure separates with low pressure, and is simple in structure, convenient production, test and maintenance.
Use divertor and resitstance voltage divider to gather corresponding electric current, voltage signal, the phase differential of corresponding electric current, voltage signal is not produced interference, anti-electromagnetic interference capability is strong, measuring accuracy and reliability height; And by selecting the divertor of different resistances for use, can realize the measurement to big electric current, measurement range can be up to more than the 200A.
Adopt optically coupled isolation circuit, advantage such as it is good to have an isolation effect, and antijamming capability is strong.
Adopt the SPI communication bus and corresponding communication interface circuit is set, make things convenient for input, the output of data, can realize intelligent management and Long-distance Control like a cork, as electricity consumption overall control, tou power price, ladder electricity price etc. to electricity consumption.
Description of drawings
The multifunction electric meter composition frame chart that the known three-phase four-wire system band of Fig. 1 neutral line current is measured.
Fig. 2 the present invention isolates spi bus electric energy metrical module composition frame chart.
Fig. 3 the present invention isolates spi bus electric energy metrical module electricity principle schematic.
Fig. 4 the present invention isolates spi bus electric energy metrical modular circuit schematic diagram.
Fig. 5 the present invention isolates spi bus electric energy metrical modular structure profile three-view diagram.
The multifunction electric meter composition frame chart that Fig. 6 three-phase four-wire system band of the present invention neutral line current is measured.
The multifunction electric meter circuit theory diagrams that Fig. 7 three-phase four-wire system band of the present invention neutral line current is measured.
Fig. 8 three-phase system multifunction electric meter of the present invention composition frame chart.
Embodiment
Below in conjunction with accompanying drawing how instantiation the present invention is described.
Accompanying drawing 4 is concrete a kind of electrical schematic diagrams of implementing to isolate spi bus electric energy metrical module.
According to shown in: divertor is Rg, selects manganin manganin alloy resistance for use.Resitstance voltage divider is made up of resistance R 7, R6, R5, switch SW, and switch SW is selected electric wire connecting junction for use, and RE is a current-limiting resistance.Chip U1 and peripheral circuit thereof are formed single-phase metering circuit, here chip U1 is the electric computation chip (being different from the ADE7755 family chip of no spi bus) that has spi bus, can select for use ADE7753, the ADE7953 of external production or domestic production BL6523, CSE77XX series electric computation chip or select the chip of other equal performances for use.Photo-coupler IC1-IC9 and peripheral circuit thereof are formed the SPI optically coupled isolation circuit, and the isolation of photo-coupler IC1-IC9 is pressed should be greater than 3500VDC.Mu balanced circuit is made up of three terminal regulator U2 and peripheral circuit, and wherein RV is a voltage dependent resistor (VDR).Mu balanced circuit provides direct supply separately for this module, can certainly not establish mu balanced circuit separately and uses external D.C. regulated power supply.
Present embodiment can carry out insulation-encapsulated by profile shown in the accompanying drawing 5.Divertor Rg is encapsulated in the outer side of insulating body, and divertor is removable, is convenient to adjust the galvanometer weight range.Electric wire connecting junction SW is encapsulated in the insulating body, sets in advance to be closed or disconnection, and makes respective markers in the insulating body appearance.Among the figure, 1,2 is divertor Rg terminals, and terminals of 3 voltage shunts, 4-14 are the wiring pin.
During use, divertor Rg connection terminal 1,2 is connected on (A, B, C phase line or zero line N) in the test line, and divertor Rg connection terminal 2 is reference potential contact in this electricity computation chip circuit (being the signal ground Signal GND of relative reference in the circuit); When divertor Rg is connected in the phase line, connection terminal 2 reference potentials are exactly the current potential of measuring phase line, wired voltage 220VAC between phase line and the zero line N.The phase line current that divertor Rg passes through forms voltage drop, holds with V1P, the V1N that C2, protection diode D1 and D2 are linked to electric computation chip U1 through resistance R 1-R4, capacitor C 1.
What particularly point out is: when electric computation chip U1 measures electric current in the phase line, wiring pin 3 must be connected to zero line N; When electric computation chip U1 measures electric current among the zero line N, electric wire connecting junction SW needs to disconnect in the circuit, and wiring pin 3 can select a phase line to connect; And electric computation chip U1 measures the line voltage 220VAC between phase line and the zero line N, is through current-limiting resistance RE, electric wire connecting junction SW, resistance R 5-R8, capacitor C 3 and C4 circuit dividing potential drop, branch pressure voltage is linked to V2P, the V2N end of electric computation chip U1.When electric computation chip U1 measured in the phase line electric current, electric computation chip U1 floated on the phase current potential and works, and by V1P, V1N end and V2P, V2N end, finished the measurement of collection line voltage and phase current.
Because electric current in the measurement phase line, electricity computation chip U1 floats over the circuit (phase current potential and zero line N have high voltage differential 220VAC) of working on the phase current potential, so the SPI interface of electric computation chip U1 and other interface, can not directly link, need finish the SPI communication interface and other interface links with micro-processor interface circuit by photo-coupler with micro-processor interface circuit; The electricity computation chip U1 reset pin mouth 1 pin mouth 17-20 that communicates by letter with SPI is by photo-coupler IC1-IC5, and peripheral resistance R 11-R20, capacitor C 14-C17 finish the light isolation with C22 and link; Electricity computation chip U1 pin mouth 11-14 is by photo-coupler IC6-IC9, and peripheral resistance R 21-R26, capacitor C 18-C21 finish the light isolation with LED and link; The port that photo-coupler IC1-IC9 and micro-processor interface circuit link, pin 4-14 port is corresponding in isolating spi bus electric energy metrical module connects; LED is that output pulse frequency work shows.
The multifunction electric meter circuit theory diagrams that the three-phase four-wire system band neutral line current that accompanying drawing 7 makes up for the present invention is measured.
Wherein: U11, U12, U13, U14 are respectively the isolated spi bus electric energy metrical of A module, the isolated spi bus electric energy metrical of B module, the isolated spi bus electric energy metrical of C module, zero line N isolation spi bus electric energy metrical module.Module adopts embodiment 1 described isolation spi bus electric energy metrical module.The isolated spi bus electric energy metrical of A module U11, the isolated spi bus electric energy metrical of B module U12, the isolated spi bus electric energy metrical of C module U13, zero line N isolate spi bus electric energy metrical module U14, by divertor 1,2 connection terminals separately, through wire connection terminal 1-8, correspondence is connected in the three-phase and four-line electric wire; Wiring pin 3 among the isolated spi bus electric energy metrical of A module U11, the isolated spi bus electric energy metrical of B module U12, the isolated spi bus electric energy metrical of the C module U13 is connected to zero line N; Zero line N isolates wiring pin 3 among the spi bus electric energy metrical module U14, is connected to phase line B.
Microprocessor U10 and peripheral circuit thereof are formed micro-processor interface circuit.Microprocessor U10 is connected with the SPI communication bus with isolating between spi bus electric energy metrical module U11, U12, U13, the U14.
Microprocessor U10 wherein can select tape SPI and the microprocessor or the ARM series microprocessor of 51 series of I2C bus interface, and present embodiment is selected the microprocessor of 51 series for use.SPI interface MISO, corresponding DIN, DOUT, the SCLK that isolates SPI interface among spi bus electric energy metrical module U11, U12, U13, the U14 that connect of MOSI, CLK among the microprocessor U10; RESET, IRQ interface in 4 isolation spi bus electric energy metrical modules in parallel, correspondence is connected to I/O mouth P1.4, P1.6 among the microprocessor U10; And in 4 each self-isolation spi bus electric energy metrical module SPI interfaces, sheet selects interface CSa, CSb, CSc, CSn, and correspondence is connected to I/O mouth P0.4, P0.5, P0.6, P0.7 among the microprocessor U10; And in A, B, each isolated spi bus electric energy metrical module interface of C, voltage waveform zero passage output interface ZXa, ZXb, ZXc, correspondence is connected to I/O mouth P0.1, P2.6, P2.7 among the microprocessor U10.
For the intelligent management and the telemanagement that realize electricity consumption, present embodiment also provides communication interface circuit and data storage circuitry.The I2C bus of microprocessor U10 drives display circuit with eeprom memory, time circuit, temperature sensor, LCD and is connected.UART communication port, P2.0, P2.1, P0.0 and P1.7 I/O mouth are connected with commutation circuit CD4066, infrared communication circuit, RS485 optically coupled isolation circuit, RS485 driving circuit SP48 among the microprocessor U10.
Present embodiment also comprises mu balanced circuit, and stable VCC=3.6VDC and VE=5VDC power supply is provided; Mu balanced circuit partly comprises: voltage stabilizer U31 and U32, transformer T1 and T2, rectifier D31 and D32, voltage dependent resistor (VDR) RT1 and RT2, resistance R 31-R36, capacitor C 31-C311, diode D33-D35, rechargeable battery E form; Wherein power supply VE=5VDC provides the power supply that the RS485 buffer circuit uses, and C and the B line voltage 220V interchange of two-way mutually, through C31, R31, R33, T1 primary inductance and C32, R32, R34, T2 primary inductance, the complex impedance that forms electric capacity, inductance, resistance series connection exchanges input form.Even rechargeable battery E guarantees present embodiment under situation about having a power failure, ammeter still can be preserved data necessary and and extraneous communication.
The three-phase four-wire system multifunction electric watch circuit that the present invention makes up, its components and parts spatial layout feature is: isolation spi bus electric energy metrical module U11, U12, U13, U14 left are the high-voltage connection district to divertor 1,2 terminals, and right spi bus pin is a low-pressure area, makes that meter circuit separates with circuit-board laying-out high pressure, low pressure, clear and rational; And each isolates high-voltage electrical apparatus isolation between the spi bus electric energy metrical module, only each isolates spi bus electric energy metrical inside modules to the phase current potential of A, B, C phase mutually at A, B, C, ammeter reliability of products and security have been improved, and can solve the maintainability and the consistance of ammeter by isolating the transposing of spi bus electric energy metrical module.
The three-phase three-wire system multifunction electric meter circuit theory diagrams that accompanying drawing 8 makes up for the present invention.
Wherein: present embodiment uses three to isolate spi bus electric energy metrical module U11, U12, U13.Module still adopts embodiment 1 described isolation spi bus electric energy metrical module.Three modules divertor 1,2 connection terminals separately are serially connected among three phase line A, B, the C of circuit under test successively, and 3 of connection terminals are connected with three phase line B, C, A successively.
Other part implementation methods of present embodiment can be implemented according to the method for embodiment 2 fully.
Claims (9)
1. isolate spi bus electric energy metrical module for one kind, it is characterized in that: comprise divertor (Rg), resitstance voltage divider, single-phase metering circuit, SPI optically coupled isolation circuits etc. are partly formed, the two ends of described divertor (Rg) respectively with single-phase metering circuit signal input part V1p, signal input part V1n connects, resitstance voltage divider is formed by resistance R 7 and resistance R n serial connection, one end of resistance R 7 is connected with an end of divertor (Rg), and be connected with the signal input part V2n of single-phase metering circuit or be connected with the signal input part V2n of single-phase metering circuit by resistance R 8, the intermediate ends of resistance R 7 and resistance R n is connected with the signal input part V2p of single-phase metering circuit, the signal input of single-phase metering circuit, output terminal is connected with the SPI optically coupled isolation circuit, and described SPI optically coupled isolation circuit is with the input of single-phase metering electric weight, output signal is isolated the back through light and is inserted spi bus.
2. the described isolation spi bus of claim 1 electric energy metrical module, it is characterized in that: described divertor (Rg) is a manganin manganin alloy resistance.
3. claim 1 or 2 described isolation spi bus electric energy metrical modules, it is characterized in that: described resitstance voltage divider also comprises a switch (SW), described switch (SW) is connected with resistance (Rn).
4. claim 1 or 2 described isolation spi bus electric energy metrical modules, it is characterized in that: described resitstance voltage divider, single-phase metering circuit, SPI optically coupled isolation circuit are encapsulated in the insulating body, one side of insulating body is drawn three terminals, first terminals (1), second terminals (2) outer meeting resistance shunts (Rg), the 3rd terminals (3) are connected with resitstance voltage divider, and the interface pin of SPI optically coupled isolation circuit is installed in the opposite side of insulating body.
5. the described isolation spi bus of claim 3 electric energy metrical module, it is characterized in that: described resitstance voltage divider resistance R 7, resistance R n and switch (SW), single-phase metering circuit, SPI optically coupled isolation circuit are encapsulated in the insulating body, one side of insulating body is drawn three terminals, first terminals (1), second terminals (2) outer meeting resistance shunts (Rg), the 3rd terminals (3) are connected with resitstance voltage divider, and the interface pin of SPI optically coupled isolation circuit is installed in the opposite side of insulating body.
6. the multifunction electric meter measured of a three-phase four-wire system band neutral line current, it is characterized in that: comprise that 4 are isolated spi bus electric energy metrical module (U11, U12, U13, U14), the SPI communication bus, micro-processor interface circuit is partly formed, described isolation spi bus electric energy metrical module is arbitrary isolation spi bus electric energy metrical module of claim 1 to 5, wherein isolate spi bus electric energy metrical module (U11 for 3, U12, U13) divertor (Rg) is serially connected in respectively in three phase lines of circuit to be measured, one end of resitstance voltage divider is connected with zero line, 1 divertor (Rg) of isolating spi bus electric energy metrical module (U14) is serially connected in the zero line in addition, one end of resitstance voltage divider is connected with arbitrary phase line, and described micro-processor interface circuit is connected by the SPI communication bus with 4 isolation spi bus electric energy metrical modules.
7. the multifunction electric meter of the described three-phase four-wire system band of claim 6 neutral line current measurement is characterized in that: also comprise communication interface circuit, data storage circuitry.
8. three-phase three-wire system multifunction electric meter, it is characterized in that: comprise that 3 are isolated spi bus electric energy metrical module (U11, U12, U13), the SPI communication bus, micro-processor interface circuit is partly formed, described isolation spi bus electric energy metrical module is arbitrary isolation spi bus electric energy metrical module of claim 1 to 5, isolate spi bus electric energy metrical module (U11 for described 3, U12, U13) divertor (Rg) is serially connected in three phase line A of circuit to be measured successively, B, among the C, one end of resitstance voltage divider successively with three phase line B, C, A connects, and described micro-processor interface circuit is connected by the SPI communication bus with 3 isolation spi bus electric energy metrical modules.
9. the described three-phase three-wire system multifunction electric meter of claim 8 is characterized in that: also comprise communication interface circuit, data storage circuitry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220278713 CN203084073U (en) | 2012-06-14 | 2012-06-14 | Isolation type SPI bus electric energy metering module and multifunctional ammeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220278713 CN203084073U (en) | 2012-06-14 | 2012-06-14 | Isolation type SPI bus electric energy metering module and multifunctional ammeter |
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| Publication Number | Publication Date |
|---|---|
| CN203084073U true CN203084073U (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220278713 Expired - Fee Related CN203084073U (en) | 2012-06-14 | 2012-06-14 | Isolation type SPI bus electric energy metering module and multifunctional ammeter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959821A (en) * | 2018-10-11 | 2019-07-02 | 郭建国 | A kind of high-precision intelligent ammeter based on current divider |
| CN116338304A (en) * | 2023-03-31 | 2023-06-27 | 江苏斯菲尔电气股份有限公司 | Electric energy meter circuit suitable for DC1500V voltage input |
-
2012
- 2012-06-14 CN CN 201220278713 patent/CN203084073U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959821A (en) * | 2018-10-11 | 2019-07-02 | 郭建国 | A kind of high-precision intelligent ammeter based on current divider |
| CN116338304A (en) * | 2023-03-31 | 2023-06-27 | 江苏斯菲尔电气股份有限公司 | Electric energy meter circuit suitable for DC1500V voltage input |
| CN116338304B (en) * | 2023-03-31 | 2024-06-11 | 江苏斯菲尔电气股份有限公司 | Electric energy meter circuit suitable for DC1500V voltage input |
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