CN103424617B - Single-phase electric energy metering system - Google Patents
Single-phase electric energy metering system Download PDFInfo
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- CN103424617B CN103424617B CN201310177683.3A CN201310177683A CN103424617B CN 103424617 B CN103424617 B CN 103424617B CN 201310177683 A CN201310177683 A CN 201310177683A CN 103424617 B CN103424617 B CN 103424617B
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Abstract
Present invention is disclosed a kind of single-phase electric energy metering system, comprise three road A/D conversion circuits, digital signal processing circuit and UART communication interface circuit, wherein this three roads A/D conversion circuit has at least a road to be provided with MUX circuit, in order to receive other interchange, direct current signal, the output terminal of this three roads A/D conversion circuit is connected with the input end of digital signal processing circuit, the signal that digital signal processing circuit Dui Gai tri-road A/D conversion circuit exports processes, and UART communication interface circuit is in order to communicate with the control module of outside, the information that outside control module acquisition number word signal processing circuit exports, and A/D conversion circuit and digital signal processing circuit are configured.
Description
[technical field]
The present invention relates to the measurement to electric signal, metering, belong to technical field of hybrid signal processing, refer to the single-phase electric energy metering system for measuring, measuring the various electric signal needed for single-phase electric energy metering device especially.
[background technology]
Electric energy meter develops to intelligent electric meter gradually from early stage mechanical power energy meter, register digital electricity meter, liquid crystal simple digital electric energy meter.Its function increases gradually from simple metering energy, progressively adds reactive measurement, effective value measurement, fundamental power metering, first-harmonic effective value measurement.In nearest development trend, turn increase the measurement and monitoring etc. of the direct current such as relay status, external electromagnetic field, AC signal.These are proposed higher requirement to the function of electric energy metered system, the number of A/D conversion circuit and performance.
[summary of the invention]
The object of the present invention is to provide a kind of single-phase electric energy metering system, in order to solve existing single-phase electric energy metering system function singleness, the problem of more measurement capabilities cannot be provided.
For achieving the above object, implement single-phase electric energy metering system of the present invention and comprise three road A/D conversion circuits, digital signal processing circuit and UART communication interface circuit, wherein this three roads A/D conversion circuit has at least a road to be provided with MUX circuit, exchange in order to receive, direct current signal, the output terminal of this three roads A/D conversion circuit is connected with the input end of digital signal processing circuit, the signal that digital signal processing circuit Dui Gai tri-road A/D conversion circuit exports processes, and UART communication interface circuit is in order to communicate with the control module of outside, the information that outside control module acquisition number word signal processing circuit exports, and A/D conversion circuit and digital signal processing circuit are configured, this three roads A/D conversion circuit is in order to a road voltage, two-way electric current exchanges with a road, two-way direct current signal is changed, three railway digital signals are become from simulation modality, wherein this three roads A/D conversion circuit is all configured with low-noise simulation amplifying circuit, the input end of the low-noise simulation amplifying circuit on the first via and the second tunnel accesses voltage U and A road current signal IA respectively, and the 3rd tunnel comprises a MUX circuit, this MUX circuit can be selected to input B road current signal IB, ac input signal VT, direct current signal VDC1, direct current signal VDC2, the output terminal of this MUX circuit is connected with the input end of low-noise simulation amplifying circuit, and the output terminal of three low-noise simulation amplifying circuits is connected with A/D conversion circuit, A/D conversion circuit exports three railway digital signal U/I and M.
According to above-mentioned principal character, this digital signal processing circuit comprises angular difference correction, fast current detection, voltage/current AC/DC component, U signal fundamental frequency, first-harmonic instantaneous active/reactive power/energy, first-harmonic on average meritorious/reactive power/energy, first-harmonic instantaneous voltage/current effective value, first-harmonic average voltage/current effective value, all-wave instantaneous active/reactive power/energy, all-wave on average meritorious/reactive power/energy, all-wave instantaneous voltage/current effective value and all-wave average voltage/current effective value computing unit.
According to above-mentioned principal character, this single-phase electric energy metering system also comprises reference voltage source, and this reference voltage source produces one does not affect voltage for A/D conversion circuit by supply voltage/chip temperature.
According to above-mentioned principal character, electric power management circuit comprises LDO power supply and POR reset management circuit, wherein the generation of LDO power supply can be configured to the power supply of 1.4V ~ 2.0V (giving tacit consent to 1.8V after reset) for system, POR reset management circuit is in order to produce reset lower than during a level, halt system work when input voltage.
According to above-mentioned principal character, look-at-me circuit for generating is in order to provide a signal interrupting form for external control unit outside process to various event.
According to above-mentioned principal character, system management circuit is communicated by UART according to external reset input signal RSTN and external control unit outside the duty of the configuration management system carried out.
According to above-mentioned principal character, WDT watchdog circuit is for detecting the time out fault in communication process.
According to above-mentioned principal character, crystal start-oscillation circuit is in order to provide chip one clock frequency accurately.
Compared with prior art, implement single-phase electric energy metering system of the present invention and more measurement capability can be provided, function more comprehensively can be realized, thus difference demand easily can be met.
[accompanying drawing explanation]
Fig. 1 is the composition block schematic illustration implementing single-phase electric energy metering system of the present invention.
[embodiment]
Refer to shown in Fig. 1, for implementing the composition block schematic illustration of single-phase electric energy metering system of the present invention, implement single-phase electric energy metering system of the present invention and be applicable to the use of single-phase electric energy metering device, for carrying out measuring to electric signal and providing extra interchange, the measurement function of direct current signal.This single-phase electric energy metering system comprises:
Three road A/D conversion circuits, to a road voltage, two-way electric current exchanges with a road, two-way direct current signal is changed, three railway digital signals are become from simulation modality, wherein this three roads A/D conversion circuit is all configured with low-noise simulation amplifying circuit (APGA), the input end of the low-noise simulation amplifying circuit on the first via and the second tunnel accesses voltage U and A road current signal IA respectively, and the 3rd tunnel comprises a MUX circuit (MUX), this MUX circuit can be selected to input B road current signal IB, ac input signal VT, direct current signal VDC1, direct current signal VDC2, wherein in Fig. 1, IBP/IBN pin forms the Differential Input of IB, VTP/VTN pin forms the Differential Input of VT, VDC1 and VSS () pin forms the single ended input (ground of VSS and system shares a signal) of VDC1, VDC2 and VSS () pin forms the single ended input of VDC2, the output terminal of this MUX circuit is connected with the input end of low-noise simulation amplifying circuit (APGA), and the output terminal of three low-noise simulation amplifying circuits (APGA) is connected with A/D conversion circuit (ADC), A/D conversion circuit exports three railway digital signal U/I and M.
One digital signal processing circuit, couple above-mentioned three A/D conversion circuits, to three railway digital signal U/I and M process, wherein main angular difference compensation (namely adding some phase delays between this two paths of signals) is carried out to U/I, and filtering is carried out to these signals and process obtains following information: whether (1) I signal exceedes the mark of given thresholding; (2) DC component of U/I/M signal; (3) AC compounent of U/I/M signal; (4) frequency values of U signal first-harmonic composition (frequency is near 50Hz); (5) effective value (comprising instantaneous value and mean value) of U/I/M signal; (6) effective value (comprising instantaneous value and mean value) of U/I/M signal first-harmonic composition (frequency is near 50Hz); (7)/the reactive power value (comprising instantaneous value and mean value) of gaining merit that U/I signal is corresponding; (8) fundamental active/First Harmonic Reactive Power value (comprising instantaneous value and mean value) that U/I signal first-harmonic composition (frequency is near 50Hz) is corresponding; And this digital signal processing circuit also carries out power/frequency conversion to a power (meritorious, idle, fundamental active, fundamental wave reactive power), and the frequency being converted into CF signal by performance number exports.In the specific implementation, this digital signal processing circuit comprises angular difference and corrects, fast current detects, voltage/current AC/DC component, U signal fundamental frequency, first-harmonic instantaneous active/reactive power/energy, first-harmonic is meritorious/reactive power/energy on average, first-harmonic instantaneous voltage/current effective value, all-wave average voltage/current effective value, all-wave instantaneous active/reactive power/energy, all-wave is meritorious/reactive power/energy on average, all-wave instantaneous voltage/current effective value and first-harmonic average voltage/current effective value computing unit etc., to complete calculating and the process of above-mentioned each information, its principle of work has description existing in the art, no longer describe in detail herein.
One UART communication interface circuit, communicate with the control module (not shown) in the external world, extraneous control module can obtain the value of above-mentioned all information, can be configured A/D conversion circuit and digital signal processing circuit simultaneously, undertaken by TX/RX two pins with the communication of the control module in the external world, and B0/B1 bis-pins are used for configuration communication baud rate.
In addition, this single-phase electric energy metering system also comprises other auxiliary circuit, as reference voltage source (REF), electric power management circuit (LDO power supply and POR reset management circuit), look-at-me circuit for generating, system management circuit (reset management, Clock management, mode of operation management etc.), WDT watchdog circuit and crystal start-oscillation circuit etc.Wherein reference voltage source does not affect voltage (in the present embodiment, being 1.185V) for A/D conversion circuit by supply voltage/chip temperature in order to produce one; LDO power supply produce in this example can be configured to 1.4V ~ 2.0V (giving tacit consent to 1.8V after reset) power supply for system; POR reset management circuit, in order to reset lower than producing during a level when input voltage, halt system work; Interrupt circuit for generating (INT) in order to provide one to interrupt the signal of form for external control unit outside process to various event (mainly exceptional reset, internal data make mistakes, current detecting result etc.); System management circuit (SysCtrl) is in order to the duty of the configuration management system carried out that communicated by UART according to external reset input signal RSTN and external control unit outside; WDT watchdog circuit is for detecting the time out fault in communication process; OSC crystal start-oscillation circuit is in order to provide chip one clock frequency accurately, and what adopt in the present embodiment is the crystal of a 6.5536MHz.
Utilize above-mentioned single-phase electric energy metering system to complete to comprise that a road voltage, two-way electric current and first-harmonic effective value thereof calculate, gain merit in a road, idle and fundamental active/reactive power calculates, a road energy meter and power/frequency conversion exports and measurement (comprising DC component and effective value) to two-way direct current signal, a road AC signal.
Meanwhile, utilize above-mentioned framework, implement single-phase electric energy metering system of the present invention and more measurement capability can be provided, function more comprehensively can be realized, thus difference demand easily can be met.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection domain that all should belong to the claim appended by the present invention.
Claims (8)
1. a single-phase electric energy metering system, comprise three road A/D conversion circuits, digital signal processing circuit and UART communication interface circuit, it is characterized in that: this three roads A/D conversion circuit has at least a road to be provided with MUX circuit, exchange in order to receive, direct current signal, the output terminal of this three roads A/D conversion circuit is connected with the input end of digital signal processing circuit, the signal that digital signal processing circuit Dui Gai tri-road A/D conversion circuit exports processes, and UART communication interface circuit is in order to communicate with the control module of outside, the information that outside control module acquisition number word signal processing circuit exports, and A/D conversion circuit and digital signal processing circuit are configured, this three roads A/D conversion circuit is in order to a road voltage, two-way electric current exchanges with a road, two-way direct current signal is changed, three railway digital signals are become from simulation modality, wherein this three roads A/D conversion circuit is all configured with low-noise simulation amplifying circuit, the input end of the low-noise simulation amplifying circuit on the first via and the second tunnel accesses voltage U and A road current signal IA respectively, and the 3rd tunnel comprises a MUX circuit, this MUX circuit can be selected to input B road current signal IB, ac input signal VT, direct current signal VDC1, direct current signal VDC2, the output terminal of this MUX circuit is connected with the input end of low-noise simulation amplifying circuit, and the output terminal of three low-noise simulation amplifying circuits is connected with A/D conversion circuit, A/D conversion circuit exports three railway digital signal U/I and M.
2. single-phase electric energy metering system as claimed in claim 1, it is characterized in that: this digital signal processing circuit comprises angular difference and corrects, fast current detects, voltage/current AC/DC component, U signal fundamental frequency, first-harmonic instantaneous active/reactive power/energy, first-harmonic is meritorious/reactive power/energy on average, first-harmonic instantaneous voltage/current effective value, first-harmonic average voltage/current effective value, all-wave average voltage/current effective value, all-wave instantaneous active/reactive power/energy, all-wave is meritorious/reactive power/energy and all-wave instantaneous voltage/current effective value computing unit on average.
3. single-phase electric energy metering system as claimed in claim 1, it is characterized in that: this single-phase electric energy metering system also comprises reference voltage source, this reference voltage source produces one does not affect voltage for A/D conversion circuit by supply voltage/chip temperature.
4. single-phase electric energy metering system as claimed in claim 1, it is characterized in that: electric power management circuit comprises LDO power supply and POR reset management circuit, wherein the generation of LDO power supply is configured to the power supply of 1.4V-2.0V for system, POR reset management circuit is in order to produce reset lower than during a level, halt system work when input voltage.
5. single-phase electric energy metering system as claimed in claim 1, is characterized in that: look-at-me circuit for generating is in order to provide a signal interrupting form for external control unit outside process to various event.
6. single-phase electric energy metering system as claimed in claim 1, is characterized in that: system management circuit is communicated by UART according to external reset input signal RSTN and external control unit outside the duty of the configuration management system carried out.
7. single-phase electric energy metering system as claimed in claim 1, is characterized in that: WDT watchdog circuit is for detecting the time out fault in communication process.
8. single-phase electric energy metering system as claimed in claim 1, is characterized in that: crystal start-oscillation circuit is in order to provide chip one clock frequency accurately.
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| CN201310177683.3A CN103424617B (en) | 2013-05-13 | 2013-05-13 | Single-phase electric energy metering system |
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| CN201310177683.3A CN103424617B (en) | 2013-05-13 | 2013-05-13 | Single-phase electric energy metering system |
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| CN103424617A CN103424617A (en) | 2013-12-04 |
| CN103424617B true CN103424617B (en) | 2016-03-23 |
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| CN112730973A (en) * | 2020-12-24 | 2021-04-30 | 上海贝岭股份有限公司 | Electric energy metering chip and electric energy metering device |
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| CN201141892Y (en) * | 2007-08-16 | 2008-10-29 | 天正集团有限公司 | Three-phase four-wire electronic split-phase measuring electric energy meter |
| CN201233427Y (en) * | 2008-07-04 | 2009-05-06 | 广东东方电讯科技有限公司 | Multifunction electric energy meter |
| CN201378186Y (en) * | 2009-02-26 | 2010-01-06 | 浙江省电力试验研究院 | Alternating/direct current combined electric energy meter |
| CN102253359A (en) * | 2011-04-28 | 2011-11-23 | 深圳市锐能微科技有限公司 | Method and system for correcting false wiring of three-phase four-wire watt-hour meter and watt-hour meter |
| GB2490340A (en) * | 2011-04-27 | 2012-10-31 | Northern Design Electronics Ltd | Measurement of voltages using voltage attenuation and optical isolation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7589516B2 (en) * | 2007-01-05 | 2009-09-15 | Texas Instruments Incorporated | Poly-phase electric energy meter |
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Patent Citations (6)
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|---|---|---|---|---|
| CN2172478Y (en) * | 1993-11-08 | 1994-07-20 | 姜荣行 | Multifunctional electronic watt-hour meter |
| CN201141892Y (en) * | 2007-08-16 | 2008-10-29 | 天正集团有限公司 | Three-phase four-wire electronic split-phase measuring electric energy meter |
| CN201233427Y (en) * | 2008-07-04 | 2009-05-06 | 广东东方电讯科技有限公司 | Multifunction electric energy meter |
| CN201378186Y (en) * | 2009-02-26 | 2010-01-06 | 浙江省电力试验研究院 | Alternating/direct current combined electric energy meter |
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Address after: Hangzhou City, Zhejiang province 310051 Binjiang District Dangfeng Road No. 788 sea floor of Building 9 Patentee after: Hangzhou hi tech Limited by Share Ltd Address before: Hangzhou City, Zhejiang province 310051 Binjiang District Dangfeng Road No. 788 sea floor of Building 9 Patentee before: Wangao (Hangzhou) Technology Co.Ltd |