CN101413971A - Electrical energy meter and method for amplifying signal used therein - Google Patents
Electrical energy meter and method for amplifying signal used therein Download PDFInfo
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- CN101413971A CN101413971A CNA2008101732410A CN200810173241A CN101413971A CN 101413971 A CN101413971 A CN 101413971A CN A2008101732410 A CNA2008101732410 A CN A2008101732410A CN 200810173241 A CN200810173241 A CN 200810173241A CN 101413971 A CN101413971 A CN 101413971A
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Abstract
The invention discloses a signal amplification method and a power meter, and the signal amplification method comprises: a voltage signal is input into a programmable gain amplifier PGA in the power meter and an amplification control signal of the voltage signal is provided, or a current signal is input and the amplification control signal of the current signal is provided; the PGA carries out the amplification treatment of the voltage signal or the current signal according to the amplification which is indicated in the currently received amplification control signal. The use of the method can solve the problem that the measurement range of the power meter which adopts the multiplexing algorithm in the prior art is comparatively small.
Description
Technical field
The present invention relates to the electric energy meter application, relate in particular to the method for amplifying signal and the electric energy meter that are input in the electric energy meter.
Background technology
Electric energy meter is by analog to digital converter (ADC) voltage signal and the current signal of simulation to be sampled, and converts their digital signal corresponding to, so that follow-up metering circuit comes data such as rated output, electric energy and effective value.
In recent years, in order to reduce chip area, reduce cost, in three-phase electric energy meter, adopt the time division multiplex algorithm, utilize an ADC to come the analog voltage signal and the current signal of leggy are sampled, and converting digital signal corresponding to, publication number is that the Chinese patent of CN 1682119 has been announced this method.
Figure 1 shows that and in three-phase electric energy meter, adopt said method that voltage signal and current signal are carried out analog-to-digital synoptic diagram, analog voltage signal UA 101, UB 103 and UC 105 represent to be respectively from three phase places of three-phase electrical system the voltage signal of A, B and C respectively, and analog current signal IA 102, IB104 and IC 106 represent to be respectively from three phase places of three-phase electrical system the current signal of A, B and C respectively.Because ADC 120 once can only change a signal, therefore, use multiplexer MUX 110 scheduling signals UA 101, IA 102, UB 103, IB 104, UC 105 and IC 106, voltage signal UA 101 from a plurality of inputs, UB 103, UC 105 and current signal IA 102, IB 104, select a signal output among the IC 106, input signal as ADC 120, demodulation multiplexer DEMUX 130 will be through the digital signal demultiplexing of ADC 120 conversion generations, generate a plurality of digital signal Ua 151, Ia 152, Ub153, Ib 154, Uc 155 and Ic 156, these a plurality of digital signal Ua 151, Ia 152, Ub 153, Ib 154, Uc 155 and Ic 156 and a plurality of simulating signal UA 101 that import, IA 102, UB 103, IB 104, UC 105 and IC 106 are corresponding one by one, the clock signal of MUX 110 and DEMUX 130 is CLK 111, and the clock signal of ADC 120 is CLK 121.Because the non-sampling simultaneously of electric current and voltage, so for voltage signal and current signal from same phase place, such as UA 101 and IA 102, a phase differential is arranged between digital signal Ua 151 after its corresponding conversion and the Ia 152, compensate this phase differential so need carry out filtering by 140 couples of current signal Ia of phase compensation filter 152, in like manner, also need carry out filtering and compensate phase differential between its corresponding voltage signal by 140 couples of current signal Ib 154 of phase compensation filter and Ic 156.
Based on said method, in order to improve the measurement range of electric energy meter, existing additive method adds a programmable gain amplifier PGA 200 between MUX 110 and ADC 120, the voltage signal of MUX 110 outputs or current signal are as the input signal of PGA 200, after PGA 200 amplifies, import ADC120 again and carry out analog to digital conversion, as shown in Figure 2, amplify by 200 pairs of above-mentioned voltage signals of PGA and current signal, improve the measurement range of electric energy meter.
But, in electrical system, the magnitude of voltage of voltage signal to be measured generally depends on the regulation of country, variation range is little, and the current value of current signal to be measured generally from several milliamperes to above 100 amperes, variation range is but very big, adopt said method, when the magnitude of voltage of voltage signal bigger, the current value ratio of current signal hour, because it is not high that ADC measures the precision of small-signal, if thinking to measure current value exactly then need amplifies current signal, but because voltage signal is amplified identical multiple with current signal, at this moment, voltage signal also has been exaggerated identical multiple, and the magnitude of voltage of the voltage signal that process is amplified may exceed the measurement range of ADC, therefore, in order to make ADC simultaneously measuring voltage value and current value exactly, the enlargement factor of PGA is restricted, and the minimum current value that ADC can measure exactly is also bigger, causes adopting the measurement range of electric energy meter of multiplexing algorithm less than normal.
Summary of the invention
The invention provides a kind of method for amplifying signal and electric energy meter, in order to solve the measurement range problem less than normal that prior art adopts the electric energy meter of multiplexing algorithm.
The embodiment of the invention provides a kind of electric energy meter, comprising:
Enlargement factor control signal transmitting element is used for when outputing signal to described PGA, sends the enlargement factor control signal to described PGA, and indication is to the enlargement factor of this signal;
Programmable gain amplifier PGA is used for when its input signal, and the enlargement factor of indicating in the enlargement factor control signal according to current reception is amplified described signal.
Described signal to the PGA input is voltage signal or current signal.
Above-mentioned electric energy meter also comprises output control signal transmitting element and multiplexer;
Described output control signal transmitting element is used to send first kind output control signal or second type output control signal to described multiplexer;
Described multiplexer is used for selecting the voltage signal of input to export to described PGA according to the first kind output control signal that receives; Perhaps, select the current signal of input to export to described PGA according to second type output control signal that receives.
Above-mentioned electric energy meter also comprises:
Analog to digital converter, the voltage signal or the current signal that are used for amplifying through described PGA convert digital signal to;
Described output control signal transmitting element is a frequency divider, is used for the clock signal of described analog to digital converter is carried out integral frequency divisioil, generates described first kind output control signal or described second type output control signal.
Described output control signal transmitting element also is used for, and sends described first kind output control signal or described second type output control signal to described enlargement factor control signal transmitting element;
Described enlargement factor control signal transmitting element also is used for generating described enlargement factor control signal according to the described first kind output control signal or described second type output control signal that receive.
Above-mentioned electric energy meter also comprises:
Demodulation multiplexer is used for the voltage signal that the digital signal demultiplexing is and described multiplexer is imported of described analog to digital converter output and the corresponding digital signal of current signal of input.
The embodiment of the invention provides a kind of method for amplifying signal that is applied to electric energy meter, comprising:
Programmable gain amplifier PGA input signal in electric energy meter also provides the enlargement factor control signal of this signal;
The enlargement factor of indicating in the enlargement factor control signal of described PGA according to current reception is carried out processing and amplifying to described signal.
Described signal to the PGA input is voltage signal or current signal.
To described PGA input signal, specifically comprise:
Multiplexer in described electric energy meter sends first kind output control signal or second type output control signal;
Described multiplexer selects the voltage signal of input to export to described PGA according to the first kind output control signal that receives; Perhaps, select the current signal of input to export to described PGA according to second type output control signal that receives.
When described electric energy meter was three-phase electric energy meter, described first kind output control signal comprised: the first output control signal, the second output control signal or the 3rd output control signal;
Described multiplexer in described electric energy meter sends first kind output control signal, specifically comprises: the multiplexer in described electric energy meter sends the first output control signal, the second output control signal or the 3rd output control signal;
Described multiplexer selects the voltage signal of input to export to described PGA according to the first kind output control signal that receives, and specifically comprises:
Described multiplexer is according to the first output control signal that receives, and first phase voltage signal in the three-phase voltage signal of selecting to import is exported to described PGA; Or according to the second output control signal that receives, second phase voltage signal in the three-phase voltage signal of selecting to import is exported to described PGA; Or according to the 3rd output control signal that receives, the third phase voltage signal in the three-phase voltage signal of selecting to import is given described PGA;
And
Described second type output control signal comprises: the 4th output control signal, the 5th output control signal or the 6th output control signal;
Described multiplexer in described electric energy meter sends second type output control signal, specifically comprises: the multiplexer in described electric energy meter sends the 4th output control signal, the 5th output control signal or the 6th output control signal;
Described multiplexer selects the current signal of input to export to described PGA according to second type output control signal that receives, and specifically comprises:
Described multiplexer is according to the 4th output control signal that receives, and first phase current signal in the three-phase current signal of selecting to import is exported to described PGA; Or according to the 5th output control signal that receives, second phase current signal in the three-phase current signal of selecting to import is exported to described PGA; Or according to the 6th output control signal that receives, the third phase current signal in the three-phase current signal of selecting to import is exported to described PGA.
Said method also comprises:
The clock signal of the analog to digital converter in the described electric energy meter is carried out integral frequency divisioil by frequency divider, generate described first kind output control signal or described second type output control signal.
Described enlargement factor control signal generates according to described first kind output control signal or described second type output control signal.
Beneficial effect of the present invention is as follows:
Voltage signal that the embodiment of the invention provides and current signal amplification method, programmable gain amplifier PGA input voltage signal in electric energy meter also provides the enlargement factor control signal of this voltage signal, or input current signal and the enlargement factor control signal of this current signal is provided; The enlargement factor of indicating in the enlargement factor control signal of PGA according to current reception is carried out processing and amplifying to this voltage signal or current signal.Therefore, adopt voltage signal provided by the invention and current signal amplification method and electric energy meter, can make PGA that voltage signal is carried out different gain control with current signal, solved the measurement range problem less than normal of the electric energy meter of prior art employing multiplexing algorithm.
Description of drawings
Fig. 1, Fig. 2 are for carrying out analog-to-digital system architecture synoptic diagram to voltage signal and current signal in the three-phase electric energy meter in the prior art;
The method for amplifying signal process flow diagram that is applied to electric energy meter that Fig. 3 provides for the embodiment of the invention;
Fig. 4 is the structural representation of electric energy meter in the embodiment of the invention;
The structural representation that in the three-phase electric energy meter that Fig. 5 provides for the embodiment of the invention voltage signal and current signal is amplified;
Fig. 6 is a fraction frequency device synoptic diagram in the embodiment of the invention;
Fig. 7 is a coherent signal waveform synoptic diagram in the frequency divider in the embodiment of the invention;
The structural representation that in the single-phase electric energy meter that Fig. 8 provides for the embodiment of the invention voltage signal and current signal is amplified.
Embodiment
The embodiment of the invention provides a kind of method for amplifying signal and electric energy meter, and the multiplexer of control in the electric energy meter selects a signal to export to PGA from the voltage signal of its a plurality of inputs and current signal; When the input signal of PGA is voltage signal, the enlargement factor to this voltage signal of indicating in the enlargement factor control signal of PGA according to current reception, amplification voltage signal; When the input signal of PGA is current signal, the enlargement factor to this current signal of indicating in the enlargement factor control signal of PGA according to current reception, amplified current signal.Adopt method for amplifying signal provided by the invention and electric energy meter, can enlarge the measurement range of the electric energy meter that adopts multiplexing algorithm.
The method for amplifying signal that the embodiment of the invention provides divides following steps as shown in Figure 3:
S801: the programmable gain amplifier PGA input signal in electric energy meter also provides the enlargement factor control signal of this signal;
The enlargement factor of indicating in the enlargement factor control signal of S802:PGA according to current reception is carried out processing and amplifying to signal.
Those skilled in the art knows clearly that the signal of indication is meant voltage signal or current signal here.
Be illustrated in figure 4 as the structural representation of electric energy meter in the embodiment of the invention, comprise: PGA 310, enlargement factor control signal transmitting element 320, output control signal transmitting element 330, multiplexer 340, analog to digital converter 350 and demodulation multiplexer 360.
Function to each structure is described in detail below.
Enlargement factor control signal transmitting element 320 is used for sending the enlargement factor control signals to PGA 310 when output voltage signal or current signal are given PGA310, and indication is to the enlargement factor of this voltage signal or current signal;
Output control signal transmitting element 330 is used to send first kind output control signal or second type output control signal to multiplexer 340;
Analog to digital converter 350, the voltage signal or the current signal that are used for amplifying through PGA 310 convert digital signal to;
Above-mentioned output control signal transmitting element 330 also is used for the clock signal of analog to digital converter 350 is carried out integral frequency divisioil, generates first kind output control signal or second type output control signal.
Above-mentioned output control signal transmitting element 330 also is used to send first kind output control signal or second type output control signal to enlargement factor control signal transmitting element 320.
Above-mentioned output control signal transmitting element 330 also is used to send first kind output control signal or second type output control signal to demodulation multiplexer 360.
Above-mentioned enlargement factor control signal transmitting element 320 also is used for generating the enlargement factor control signal according to first kind output control signal that receives or second type output control signal.
Provide the concrete structure embodiment of above-mentioned electric energy meter below, and the method that the voltage signal that is input to this electric energy meter and current signal amplify is described in detail in conjunction with the concrete structure of electric energy meter.
Embodiment one:
A kind of three-phase electric energy meter structural representation as shown in Figure 5, comprise: PGA 310, multiplexer MUX 340, ADC 350 and demodulation multiplexer DEMUX 360, enlargement factor control signal transmitting element 320 in the above-mentioned electric energy meter is realized that by multiplexer MUX 410 output control signal transmitting element 330 is realized by frequency divider 400.Frequency divider 400 carries out integral frequency divisioil generation signal 401 with the clock signal clk 121 of ADC 350, signal 402 and signal 403, with signal 401, the combination of signal 402 and signal 403 is as the output control signal 401 of MUX 340,402 and 403, be used to control the voltage signal UA 101 of MUX 340 from a plurality of inputs, UB 103, UC 105 and current signal IA 102, IB 104, select a signal output among the IC 106, input as PGA 310, also being used to control DEMUX 360 will be through the digital signal demultiplexing of ADC 350 conversion generations, generate a plurality of digital signal Ua 151, Ia 152, Ub153, Ib 154, Uc 155 and Ic 156, these a plurality of digital signal Ua 151, Ia 152, Ub 153, Ib 154, Uc 155 and Ic 156 and a plurality of simulating signal UA 101, IA 102, UB 103, IB 104, UC 105 and IC 106 are one to one.
In the embodiment of the invention, signal 401, signal 402 and signal 403 are respectively the binary digit pulse signal, when signal 401 is " 0 " (low level), will export control signal 401,402 and 403 as first kind output control signal, voltage signal of control MUX 340 outputs; When signal 401 is " 1 " (high level), will export control signal 401,402 and 403 as second type output control signal, current signal of control MUX 340 outputs.
Further, when signal 402 and signal 403 are respectively the various combination of " 0 " or " 1 ", output control signal 401,402 and 403 correspondences be respectively first output control signal, the second output control signal, the 3rd output control signal, the 4th output control signal, the 5th output control signal or the 6th output control signal are used to control the MUX 340 corresponding output first phase voltage signal UA101, the second phase voltage signal UB103, third phase voltage signal UC105, the first phase current signal IA102, the second phase current signal IB104 or third phase current signal IC106.Concrete, the output of output control signal 401,402 and 403 value and corresponding MUX 340 is as shown in table 1,
The output of the value of table 1 output control signal 401,402,403 and corresponding MUX 340
The signal 401 that frequency divider 400 generates also is used to control MUX 410 and generates signal 411, signal 412 and signal 413, with the combination of signal 411, signal 412 and signal 413 enlargement factor control signal 411,412 and 413, be used for determining the enlargement factor of PGA 310 to its input signal as PGA 310; Input signal 421, the signal 422 with MUX 410 is identical with signal 423 respectively for signal 411, signal 412 and the signal 413 of signal 401 control MUX 410 outputs, perhaps input signal 424, the signal 425 with MUX 410 is identical with signal 426 respectively, wherein, the combination of signal 421, signal 422 and signal 423 is used to be provided with the enlargement factor of 310 pairs of voltage signals of PGA, signal 424, signal 425 and signal 426 are used to be provided with the enlargement factor of 310 pairs of current signals of PGA, and signal 421-426 is provided by the system outside.
In the embodiment of the invention, when signal 401 was " 0 ", input signal 421, the signal 422 with MUX 410 was identical with signal 423 respectively with 413 for the enlargement factor control signal 411,412 of MUX 410 outputs; When signal 401 was " 1 ", input signal 424, the signal 425 with MUX 410 was identical with signal 426 respectively with 413 for the enlargement factor control signal 411,412 of MUX 410 outputs.The output of the MUX 410 of the value of signal 401 and correspondence is as shown in table 2,
The output of the MUX 410 of the value of table 2 signal 401 and correspondence
| 401 | The output of |
|
| First kind output control signal | 0 | 421,422 and 423 |
| Second type |
1 | 424,425 and 426 |
In the embodiment of the invention, signal 411, signal 412 and signal 413 are respectively the binary digit pulse signal, can be respectively " 0 " or " 1 ", when signal 411, signal 412 and signal 413 are respectively the various combination of " 0 " or " 1 ", the enlargement factor of the PGA 310 that enlargement factor control signal 411,412 and 413 expressions are corresponding, concrete, the enlargement factor of enlargement factor control signal 411,412 and 413 value and corresponding PGA310 is as shown in table 3
The enlargement factor of the PGA 310 of the value of table 3 enlargement factor control signal 411,412,413 and correspondence
| 413 | 412 | 411 | The enlargement factor of |
| 0 | 0 | 0 | 1 times |
| 0 | 0 | 1 | 2 times |
| 0 | 1 | 0 | 4 times |
| 0 | 1 | 1 | 8 |
| 1 | 0 | 0 | 16 |
| 1 | 0 | 1 | 16 |
| 1 | 1 | 0 | 16 |
| 1 | 1 | 1 | 16 times |
By the description in the above-mentioned table 1 as seen, when signal 401 was " 0 ", the signal of MUX 340 outputs was voltage signal UA 101, UB 103 or UC 105, and when signal 401 was " 1 ", the signal of MUX 340 outputs was current signal IA 102, IB 104 or IC 106; By the description in the above-mentioned table 2 as seen, when signal 401 is " 0 ", input signal 421, the signal 422 with MUX410 is identical with signal 423 respectively with 413 for the enlargement factor control signal 411,412 of MUX 410 outputs, associative list 1 as can be known, corresponding indication PGA310 is to the enlargement factor of voltage signal, when signal 401 is " 1 ", input signal 424, the signal 425 with MUX 410 is identical with signal 426 respectively with 413 for the enlargement factor control signal 411,412 of MUX 410 outputs, associative list 1 as can be known, the enlargement factor of 310 pairs of current signals of corresponding indication PGA; Specifically set the enlargement factor of the PGA310 of the value of enlargement factor control signal 411,412 and 413 and corresponding indication in the above-mentioned table 3 to its input signal.
In above-mentioned three-phase electric energy meter, clock signal clk 121 frequencies of ADC 350 are integral multiples of clock signal clk 111 frequencies of MUX 340 and DEMUX 360, therefore, the embodiment of the invention has been used frequency divider 400, as the output control signal transmitting element 330 in the above-mentioned electric energy meter, clock signal clk 121 is carried out integral frequency divisioil generate output control signal 401,402 and 403 control MUX 340 and DEMUX360 work, Figure 6 shows that the structural representation of frequency divider 400 in the embodiment of the invention, comprising: comparer 510, counter 520, toggle flip-flop 530, phase inverter 540, d type flip flop 550, d type flip flop 560 and with door 570.Suppose that ADC 350 needs 511 121 cycles of clock CLK of n just can finish once conversion, then is made as n 511 to the comparison numerical value of comparer 510; Counter 520 is exported a series of countings 521 according to the rising edge of clock CLK 121, comparer 510 can compare the counting 521 of numerical value n 511 and counter 520, when numerical value n 511 equates with the counting 521 of counter 520, comparer 510 will be exported a high level square wave 512, counter 520 is compared high level square wave 512 triggerings of device 510 outputs and resets to initial state, exports a series of countings 521 according to the rising edge of clock CLK 121 again; Toggle flip-flop 530 is subjected to the triggering of the high level square wave 512 of comparer 510 outputs, generate signal 401, and signal 401 will be anti-phase; Signal 401 generates the trigger pip 541 of d type flip flop 550 and d type flip flop 560 by phase inverter 540 backs; The input signal of d type flip flop 550 is the Q end output 561 of d type flip flop 560, and the Q end of d type flip flop 550 is output as control signal 403; The Q of d type flip flop 550 end output signal 551 and signal 561 are by generating the input signal 571 of d type flip flops 560 with door 570, and the Q end of d type flip flop 560 is output as control signal 402.
Figure 7 shows that hypothesis ADC 350 needs just to finish when once changing 2 121 cycles of clock CLK, the waveform synoptic diagram of signal CLK 121, signal 521, signal 401, signal 561, signal 551, signal 402 and signal 403, signal 401, signal 402 and the signal 403 of frequency divider 400 generations satisfy the described requirement of table 1 as seen from Figure 7.
The specific implementation method of MUX 340, PGA 310, ADC 350, DEMUX 360 and MUX 410 can adopt various ways among Fig. 5, is prior art, does not do detailed description at this.
Above-mentioned is voltage signal provided by the invention and the application of current signal amplification method in three-phase electric energy meter, and among other embodiment, this method can be applied in the single-phase electric energy meter equally.
Embodiment two:
A kind of single-phase electric energy meter structural representation as shown in Figure 8, owing to need carry out analog-to-digital signal is that a voltage signal U701 and a current signal I702 amount to two signals, therefore, only need frequency divider 400 that clock signal clk 121 is carried out integral frequency divisioil and generate the output control signal 401 of a signal 401 as MUX 710, control MUX 710 and from signal U701 and I702, select a signal output, input signal as PGA 310, output control signal 401 also is used to control DEMUX 720 with the digital signal demultiplexing, generates two digital signal U721 and I722.Concrete, the output of the value of output control signal 401 and corresponding MUX 710 is as shown in table 4,
The output of the value of table 4 output control signal 401 and corresponding MUX 710
| 401 | The output of |
|
| First kind output control signal | 0 | U701 |
| Second type |
1 | I702 |
The output of the value of output control signal 401 and corresponding MUX 410, and the value of the enlargement factor control signal 411,412 of PGA 310 receptions and 413 and corresponding enlargement factor are with identical among the embodiment one, shown in table 2, table 3.
In sum, the scheme that the embodiment of the invention provides, the multiplexer of control in the electric energy meter selects a signal to export to PGA from the voltage signal of its a plurality of inputs and current signal; When the input signal of PGA is voltage signal, the enlargement factor to this voltage signal of indicating in the enlargement factor control signal of PGA according to current reception, amplification voltage signal; When the input signal of PGA is current signal, the enlargement factor to this current signal of indicating in the enlargement factor control signal of PGA according to current reception, amplified current signal.Solved the measurement range problem less than normal of the electric energy meter of prior art employing multiplexing algorithm.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1, a kind of electric energy meter is characterized in that, comprising:
Enlargement factor control signal transmitting element is used for when outputing signal to described PGA, sends the enlargement factor control signal to described PGA, and indication is to the enlargement factor of this signal;
Programmable gain amplifier PGA is used for when its input signal, and the enlargement factor of indicating in the enlargement factor control signal according to current reception is amplified described signal.
2, electric energy meter as claimed in claim 1 is characterized in that, described signal to the PGA input is voltage signal or current signal.
3, electric energy meter as claimed in claim 2 is characterized in that, described electric energy meter further comprises:
Output control signal transmitting element is used to send second type output control signal that is used to represent the first kind output control signal of voltage type control signal or is used to represent the current type control signal to described multiplexer;
Multiplexer is used for selecting the voltage signal of input to export to described PGA according to the first kind output control signal that receives; Perhaps, select the current signal of input to export to described PGA according to second type output control signal that receives.
4, electric energy meter as claimed in claim 3 is characterized in that, described electric energy meter further comprises:
Analog to digital converter, the voltage signal or the current signal that are used for amplifying through described PGA convert digital signal to;
Described output control signal transmitting element is a frequency divider, is used for the clock signal of described analog to digital converter is carried out integral frequency divisioil, generates described first kind output control signal or described second type output control signal.
As claim 3 or 4 described electric energy meters, it is characterized in that 5, described output control signal transmitting element also is used for, send described first kind output control signal or described second type output control signal to described enlargement factor control signal transmitting element;
Described enlargement factor control signal transmitting element also is used for generating described enlargement factor control signal according to the described first kind output control signal or described second type output control signal that receive.
6, electric energy meter as claimed in claim 5 is characterized in that, described electric energy meter further comprises:
Demodulation multiplexer is used for the voltage signal that the digital signal demultiplexing is and described multiplexer is imported of described analog to digital converter output and the corresponding digital signal of current signal of input.
7, a kind of method for amplifying signal that is applied to electric energy meter, described electric energy meter comprises programmable gain amplifier PGA and multiplexer and frequency divider, it is characterized in that, described method comprises:
Programmable gain amplifier PGA input signal in electric energy meter also provides the enlargement factor control signal of this signal;
The enlargement factor of indicating in the enlargement factor control signal of described PGA according to current reception is carried out processing and amplifying to described signal.
8, method as claimed in claim 7 is characterized in that, described signal to the PGA input is voltage signal or current signal.
9, method as claimed in claim 8 is characterized in that, to described PGA input signal, specifically comprises:
Multiplexer in described electric energy meter sends and is used to second type output control signal representing the first kind output control signal of voltage type control signal or be used to represent the current type control signal;
Described multiplexer selects the voltage signal of input to export to described PGA according to the first kind output control signal that receives; Perhaps, select the current signal of input to export to described PGA according to second type output control signal that receives.
10, method as claimed in claim 9 is characterized in that, when described electric energy meter was three-phase electric energy meter, described first kind output control signal comprised: the first output control signal, the second output control signal or the 3rd output control signal;
Described multiplexer in described electric energy meter sends first kind output control signal, specifically comprises: the multiplexer in described electric energy meter sends the first output control signal, the second output control signal or the 3rd output control signal;
Described multiplexer selects the voltage signal of input to export to described PGA according to the first kind output control signal that receives, and specifically comprises:
Described multiplexer is according to the first output control signal that receives, and first phase voltage signal in the three-phase voltage signal of selecting to import is exported to described PGA; Or according to the second output control signal that receives, second phase voltage signal in the three-phase voltage signal of selecting to import is exported to described PGA; Or according to the 3rd output control signal that receives, the third phase voltage signal in the three-phase voltage signal of selecting to import is exported to described PGA;
And
Described second type output control signal comprises: the 4th output control signal, the 5th output control signal or the 6th output control signal;
Described multiplexer in described electric energy meter sends second type output control signal, specifically comprises: the multiplexer in described electric energy meter sends the 4th output control signal, the 5th output control signal or the 6th output control signal;
Described multiplexer selects the current signal of input to export to described PGA according to second type output control signal that receives, and specifically comprises:
Described multiplexer is according to the 4th output control signal that receives, and first phase current signal in the three-phase current signal of selecting to import is exported to described PGA; Or according to the 5th output control signal that receives, second phase current signal in the three-phase current signal of selecting to import is exported to described PGA; Or according to the 6th output control signal that receives, the third phase current signal in the three-phase current signal of selecting to import is exported to described PGA.
11, as claim 9 or 10 described methods, it is characterized in that described method further comprises:
The clock signal of the analog to digital converter in the described electric energy meter is carried out integral frequency divisioil by frequency divider, generate described first kind output control signal or described second type output control signal.
As claim 9 or 10 described methods, it is characterized in that 12, described enlargement factor control signal generates according to described first kind output control signal or described second type output control signal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101893868A (en) * | 2009-05-21 | 2010-11-24 | Ls产电株式会社 | Analog output module |
| CN102135563A (en) * | 2011-02-23 | 2011-07-27 | 深圳科瑞格电子有限公司 | Method and system for calculating electric energy and electric energy meter |
| CN102262172A (en) * | 2010-05-31 | 2011-11-30 | 西门子公司 | Power monitoring method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893868A (en) * | 2009-05-21 | 2010-11-24 | Ls产电株式会社 | Analog output module |
| CN101893868B (en) * | 2009-05-21 | 2014-03-19 | Ls产电株式会社 | Analog output module |
| CN102262172A (en) * | 2010-05-31 | 2011-11-30 | 西门子公司 | Power monitoring method and device |
| CN102262172B (en) * | 2010-05-31 | 2014-06-18 | 西门子公司 | Power monitoring method and device |
| CN102135563A (en) * | 2011-02-23 | 2011-07-27 | 深圳科瑞格电子有限公司 | Method and system for calculating electric energy and electric energy meter |
| CN102135563B (en) * | 2011-02-23 | 2013-05-08 | 深圳科瑞格电子有限公司 | Method and system for calculating electric energy and electric energy meter |
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