CN103647557A - Analog-to-digital converter (ADC) circuit, electric energy metering circuit and electric energy metering system - Google Patents
Analog-to-digital converter (ADC) circuit, electric energy metering circuit and electric energy metering system Download PDFInfo
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- CN103647557A CN103647557A CN201310603166.8A CN201310603166A CN103647557A CN 103647557 A CN103647557 A CN 103647557A CN 201310603166 A CN201310603166 A CN 201310603166A CN 103647557 A CN103647557 A CN 103647557A
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Abstract
The invention relates to an analog-to-digital converter (ADC) circuit, an electric energy metering circuit and an electric energy metering system. The ADC circuit comprises a switch resistance circuit, a first operational amplifier, a second operational amplifier, a quantizer and a digital to analog converter module, wherein the input end of the first operational amplifier is connected with the switch resistance circuit; the input end of the second operational amplifier is connected with the output end of the first operational amplifier through a resistor; the input end of the quantizer is connected with the output end of the second operational amplifier, and the output end is used for outputting signals generated after comparison and quantization are carried out on output signals of the second operational amplifier; the input end of the digital to analog converter module is connected with the output end of the quantizer, and the output end is connected to the input end of the first operational amplifier and the input end of the second operational amplifier in a feedback mode. according to the embodiment of the invention, the first operational amplifier and the second operational amplifier of the ADC circuit are connected through the resistor, signals between the first operational amplifier and the second operational amplifier are transmitted continuously, thereby being a time-continuous sigma-delta ADC structure and capable of improving the precision of the ADC circuit.
Description
Technical field
The present invention relates to electric energy metrical field, relate in particular to a kind of adc circuit, ic for energy metering and electric energy metered system.
Background technology
In electric energy metrical field, need analog to digital converter (English: Analog to Digital Converter, abbreviation: ADC) analog signal of input is gathered, amplifies and convert to digital signal and carry out Digital Signal Processing for digital system.
ADC in electric energy metrical field mainly contains three kinds of implementations at present, wherein first kind of way is by gain amplifier (English: Programable Gain Amplifier, abbreviation: PGA) be integrated in the sampling capacitance of sigma delta ADC, realize different gain multiplication factors by adjusting the size of sampling capacitance.This structure need to increase Bootstrap (bootstrap) circuit PMOS switch is implemented to boost, to transmit negative level signal; In addition, by adjusting the size of electric capacity, realize different gain multiplication factors, can cause the loop bandwidth of ADC first order integrator to reduce, reach reasonable bandwidth requirement, must increase the power consumption of amplifier.
The second way is to make input signal first by the resistor-type PGA of a continuous time, realize the control to input gain, signal is outputed to and is biased in common-mode voltage simultaneously, directly flows to sigma delta ADC and changes.The adc circuit of this structure the larger negative signal of input for example-during 1V, switch cannot turn-off, and can produce electric leakage, thereby causes PGA output signal mistake.
The third mode is by the gain of reasonable disposition PGA and sigma delta ADC, to realize the function of zero offset input, and then has realized and having reduced the bandwidth of the first order integrator of sigma delta ADC, power consumption designing requirement.But the adc circuit of this structure needs extra exhibition ripple amplifier, and additionally PGA has increased noise source, need to increase filter circuit, thereby increase the complexity of circuit.
The adc circuit structure of above three kinds of implementations all adopts the structure of discrete time sigma delta ADC, and this structure is to the bandwidth requirement of amplifier in transducer higher (being generally greater than 10 times), and power consumption is larger.In addition, each of path input needs carry out anti-aliasing to larger RC circuit, have increased the production cost of chip cost and PCB.In addition, the ADC of discrete time structure has relatively high expectations to foundation of amplifier etc., when realizing high-precision adc, need to select the demand of high performance amplifier.
Summary of the invention
technical problem
In view of this, the technical problem to be solved in the present invention is how to improve the precision of adc circuit.
solution
In order to solve the problems of the technologies described above, according to one embodiment of the invention, provide a kind of analog to digital converter adc circuit, comprising: switched resistor circuit; The first operational amplifier, its input is connected with described switched resistor circuit; The second operational amplifier, its input is connected with the output of described the first operational amplifier by resistance; Quantizer, its input is connected with the output of described the second operational amplifier, and its output compares the signal after quantification for exporting to the output signal of described the second operational amplifier; Digital to analog converter module, its input is connected with the output of described quantizer, and its output feedback link is to the input of described the first operational amplifier and the input of described the second operational amplifier.
For above-mentioned adc circuit, in a kind of possible implementation, described switched resistor circuit is comprised of two switch resistance arrays, and described switch resistance array comprises: the first resistance, its one end connects the output of pending signal, and its other end connects the input of described the first operational amplifier; At least one path switching circuit, it comprises the second resistance, the first switch and second switch; One end of described the second resistance is connected with one end of described the first resistance, and the other end of described the second resistance connects the first end of described the first switch; The second end ground connection of described the first switch, the 3rd end of described the first switch connects first of configuration module and controls pin; The second end of described second switch connects the other end of described the second resistance, and the first end of described second switch connects the other end of described the first resistance, and the 3rd end of described second switch connects second of described configuration module and controls pin.
For above-mentioned adc circuit, in a kind of possible implementation, described the first operational amplifier comprises the first positive input, the first reverse input end, the first forward output and the first inverse output terminal, described the first positive input is connected with a described switch resistance array, described the first reverse input end is connected with switch resistance array described in another, between described the first positive input and described the first inverse output terminal, be connected with electric capacity, between the first forward output of described the first reverse input end and described the first operational amplifier, be connected with electric capacity.
For above-mentioned adc circuit, in a kind of possible implementation, described the second operational amplifier comprises the second positive input, the second reverse input end, the second forward output and the second inverse output terminal, between described the second reverse input end and described the first inverse output terminal, be connected with resistance, between described the second positive input and described the first forward output, be connected with resistance, between described the second positive input and described the second inverse output terminal, be connected with electric capacity, between described the second reverse input end and described the second forward output, be connected with electric capacity.
For above-mentioned adc circuit, in a kind of possible implementation, the first input end of described quantizer is connected with described the second forward output, and the second input of described quantizer is connected with described the second inverse output terminal.
For above-mentioned adc circuit, in a kind of possible implementation, described digital to analog converter module comprises two D/A converting circuits, the output of a described digital to analog converter module is connected with described the first positive input and described the first reverse input end respectively, and described in another, the output of digital to analog converter module is connected with described the second positive input and described the second reverse input end respectively.
For above-mentioned adc circuit, in a kind of possible implementation, described the first switch and/or described second switch are field effect transistor; The first end of described the first switch and/or described second switch, the second end and the 3rd end are respectively source electrode, the drain and gate of described field effect transistor.
In order to solve the problems of the technologies described above, according to another embodiment of the present invention, provide a kind of ic for energy metering, comprising: power supply, load to be measured, the first sampling resistor and adc circuit; Wherein, described power supply, described load to be measured and described the first sampling resistor series connection are a loop; Described adc circuit is in parallel with described the first sampling resistor; Described adc circuit adopts the adc circuit of any one structure in the embodiment of the present invention; The two ends of described the first sampling resistor are connected with the two ends of the switched resistor circuit of described adc circuit respectively.
In order to solve the problems of the technologies described above, according to another embodiment of the present invention, provide a kind of ic for energy metering, comprising: power supply, load to be measured, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor and adc circuit; Wherein, described adc circuit adopts the adc circuit of any one structure in the embodiment of the present invention; One end of described the second sampling resistor connects the link of described power supply and described load to be measured, and the other end of described the second sampling resistor is connected with one end of described the 3rd one end of sampling resistor and the switched resistor circuit of described adc circuit; The other end ground connection of described the 3rd sampling resistor; The other end of described the 4th one end of sampling resistor and the switched resistor circuit of described adc circuit is connected, the other end ground connection of described the 4th sampling resistor.
In order to solve the problems of the technologies described above, according to another embodiment of the present invention, provide a kind of electric energy metered system, comprising: electric current metering circuit and voltage measurement circuit; Wherein, described electric current metering circuit adopts the ic for energy metering of any one structure in the embodiment of the present invention; Described voltage measurement circuit adopt any one structure in the embodiment of the present invention ic for energy metering.
beneficial effect
Between the first operational amplifier of the adc circuit of the embodiment of the present invention and the second operational amplifier, by resistance, be connected, the signal between the two is transmission continuously, is the sigma-delta ADC structure of a kind of continuous time, can improve the precision of adc circuit.In addition, in the adc circuit of the embodiment of the present invention, the first operational amplifier and switched resistor circuit can be realized the function that amplifier (PGA) is amplified in gain, without adopting independently PGA, the noise of having avoided PGA to introduce, and reduced the quantity of the amplifier, resistance and the electric capacity that adopt, can save chip cost.
According to below with reference to accompanying drawing to detailed description of illustrative embodiments, it is clear that further feature of the present invention and aspect will become.
Accompanying drawing explanation
The accompanying drawing that is included in specification and forms a part for specification shows exemplary embodiment of the present invention, feature and aspect together with specification, and for explaining principle of the present invention.
Fig. 1 illustrates the structured flowchart of analog to digital converter adc circuit according to an embodiment of the invention;
Fig. 2 illustrates the physical circuit figure of analog to digital converter adc circuit according to another embodiment of the present invention;
Fig. 3 a illustrates the switch resistance array of analog to digital converter adc circuit and the circuit diagram of configuration module annexation according to another embodiment of the present invention;
Fig. 3 b illustrates the physical circuit figure of D/A converting circuit according to an embodiment of the invention;
Fig. 4 illustrates the schematic diagram of ic for energy metering according to an embodiment of the invention;
Fig. 5 illustrates the schematic diagram of ic for energy metering according to another embodiment of the present invention;
Fig. 6 illustrates the schematic diagram of electric energy metered system according to an embodiment of the invention.
Embodiment
Below with reference to accompanying drawing, describe various exemplary embodiments of the present invention, feature and aspect in detail.The identical same or analogous element of Reference numeral presentation function in accompanying drawing.Although the various aspects of embodiment shown in the drawings, unless otherwise indicated, needn't draw accompanying drawing in proportion.
Here special-purpose word " exemplary " means " as example, embodiment or illustrative ".Here as " exemplary " illustrated any embodiment, needn't be interpreted as being better than or being better than other embodiment.
In addition, for better explanation the present invention, in embodiment below, provided numerous details.It will be appreciated by those skilled in the art that and there is no some detail, the present invention can implement equally.In some instances, the method for knowing for those skilled in the art, means, element and circuit are not described in detail, so that highlight purport of the present invention.
embodiment 1
Fig. 1 illustrates the structured flowchart of analog to digital converter adc circuit according to an embodiment of the invention.As shown in Figure 1, this adc circuit mainly comprises: switched resistor circuit 110, the first operational amplifier 120, the second operational amplifier 130, quantizer 140 and digital to analog converter module 150.Wherein, the input of the first operational amplifier 120 is connected with switched resistor circuit 110, the input of the second operational amplifier 130 is connected with the output of the first operational amplifier 120 by resistance 160, the input of quantizer 140 is connected with the output of the second operational amplifier 130, the output of quantizer 140 compares the signal after quantification for exporting to the output signal of described the second operational amplifier, the input of digital to analog converter module 150 is connected with the output of quantizer 140, the output feedback link of digital to analog converter module 150 is to the input of the first operational amplifier 120 and the input of the second operational amplifier 130.
In a kind of possible implementation, switched resistor circuit 110 can be comprised of two switch resistance arrays, and switch disconnection or closure by control switch electric resistance array, can realize the gain of different multiples.
Between the first operational amplifier of the adc circuit of the present embodiment and the second operational amplifier, by resistance, be connected, the signal between the two is transmission continuously, is the sigma-delta ADC structure of a kind of continuous time, can improve the precision of adc circuit.In addition, in the adc circuit of the present embodiment, the first operational amplifier and switched resistor circuit can be realized the function that amplifier (PGA) is amplified in gain, without adopting independently PGA, the noise of having avoided PGA to introduce, and reduced the quantity of the amplifier, resistance and the electric capacity that adopt, can save chip cost.
embodiment 2
Fig. 2 illustrates the physical circuit figure of analog to digital converter adc circuit according to another embodiment of the present invention.The assembly that in Fig. 2, label is identical with Fig. 1 has identical function, for simplicity's sake, omits the detailed description to these assemblies.
In a kind of possible implementation, the switched resistor circuit 110 of the adc circuit shown in Fig. 2 is comprised of two switch resistance arrays 111,112, and wherein, switch resistance array 111 can be the identical module of structure with switch resistance array 112.
As shown in Figure 3 a, switch resistance array 111,112 can comprise: the first resistance 310 and four-way switch circuit.Wherein, one end A of the first resistance 310 connects the output of pending signal, and other end B connects the input of the first operational amplifier 120.Four-way switch circuit can be the identical module of structure, and each path switching circuit can include a resistance and two switches.Particularly, take a path switching circuit as example, and this switching circuit comprises second resistance 320 and two switches 321,322, wherein, one end A of the second resistance 320 is connected with one end A of the first resistance 310, and the other end B of the second resistance 320 connects the first end S of the first switch 321; The second end D ground connection of the first switch 321, the 3rd end G of the first switch 321 connects first of configuration module and controls pin; The second end D of second switch 322 connects the other end B of the second resistance 320, and the first end S of second switch 322 connects the other end B of described the first resistance 310, and the 3rd end G of second switch 322 connects second of configuration module and controls pin.
The annexation schematic diagram of configuration module and switched resistor circuit 110 as shown in Figure 3 a, annexation for clearer succinct description configuration module and switched resistor circuit 110, Fig. 3 a only be take a path switching circuit as example, and other 3 path switching circuits are consistent with annexation and the annexation described in Fig. 3 a of configuration module.It can be SELB pin that first of configuration module is controlled pin, the second control pin can be SEL pin, this configuration module is by controlling the signal of EN pin and S<1-0> pin, be worth accordingly to SELB pin and SEL pin configuration, thereby can control the whether gating of respectively organizing switch in four-way switch circuit, thereby can realize the gain of different multiples.The value of EN pin and S<1-0> pin and the relation of gain can be as shown in table 1.
The value of table 1 EN pin and S<1-0> pin and the relation of gain
| EN | S<1-0> | Gain |
| 0 | ×× | 16 |
| 1 | 00 | 8 |
| 1 | 01 | 4 |
| 1 | 10 | 2 |
| 1 | 11 | 1 |
In a kind of possible implementation, the structure of switch resistance array 111 and switch resistance array 112 can be as shown in Figure 3 a, if the resistance of the first resistance 310 is R, the resistance of the second resistance 320 can be R, the resistance of resistance 330 can be R/2, the resistance of resistance 340 can be R/4, and the resistance of resistance 350 can be R/8.If realize 4 times of gains, can be so that the first switch 321, switch 331 cut-offs, second switch 322, switch 332 conductings, thus the second resistance 320, resistance 330 are communicated with; And make switch 341, switch 351 conductings, switch 342, switch 352 conductings, so that resistance 340, resistance 350 are not communicated with.That is to say, if the equivalent resistance of switch resistance array 111 and switch resistance array 112 is reduced to one times, the gain of the adc circuit of the present embodiment is put and is twice.
In a kind of possible implementation, the switch in switch resistance array as shown in Figure 3 a can be field effect transistor, and described first end S, described the second end D and described the 3rd end G are respectively source S, drain D and the grid G of field effect transistor.
It should be noted that, although using switched resistor circuit structure that four-way switch circuit introduced adc circuit as example as above, it will be appreciated by those skilled in the art that the present invention should be not limited to this.In fact, user completely can be according to the way of personal like and/or the flexible configuration switch circuit of practical application scene, to realize the gain multiple of expectation.
The switched resistor circuit structure of the adc circuit of the present embodiment, one end B of each resistance in four-way switch circuit is passed through to fet switch ground connection on the one hand, by another fet switch, receive on the other hand the input of operational amplifier, thereby can thoroughly disconnect the impact of no resistance on adc circuit performance.In actual test and measuring process, in a path switching circuit, adopt two switches, when a switch cannot turn-off, can also adopt another switch to turn-off, can avoid because switch cannot turn-off the electric leakage problem producing, thereby guarantee to select gain amplifier accurately.
In a kind of possible implementation, as shown in Figure 2, the first operational amplifier 120 comprises the first positive input, the first reverse input end, the first forward output and the first inverse output terminal, described the first positive input is connected with switch resistance array 111, described the first reverse input end is connected with switch resistance array 112, between described the first positive input and described the first inverse output terminal, be connected with electric capacity 211, between described the first reverse input end and described the first forward output, be connected with electric capacity 212.
In a kind of possible implementation, as shown in Figure 2, the second operational amplifier 130 comprises the second positive input, the second reverse input end, the second forward output and the second inverse output terminal, between described the second reverse input end and described the first inverse output terminal, be connected with resistance 162, between described the second positive input and described the first forward output, be connected with resistance 161, between described the second positive input and the second inverse output terminal, be connected with electric capacity 221, between described the second reverse input end and the second forward output, be connected with electric capacity 222.Resistance 161 can be identical with the resistance of resistance 162.
It should be noted that, the first operational amplifier 120 can be the amplifier with chopper circuit, and chopper circuit can reduce the noise of amplifier, thereby can improve to a certain extent the certainty of measurement of adc circuit.In addition, electric capacity 211, electric capacity 212, electric capacity 221 and electric capacity 222 can improve amplifier stability, also can guarantee the accuracy of amplifier output signal.
In a kind of possible implementation, as shown in Figure 2, the first input end C1 of quantizer 140 is connected with the second forward output of the second operational amplifier 130, and the second input C2 is connected with the second inverse output terminal of the second operational amplifier 130.According to concrete application scenarios and actual needs, quantizer 140 can be the comparator of, can be also 4 or 8 s' comparator.
In a kind of possible implementation, as shown in Figure 2, digital to analog converter module 150 can comprise two D/A converting circuits 151,152, wherein, the output of D/A converting circuit 151 is connected with the first reverse input end with the first positive input of the first operational amplifier 120 respectively, the output of D/A converting circuit 152 is connected with the second reverse input end with the second positive input of the second operational amplifier 130 respectively, for the digital signal of quantizer 140 outputs is converted into analog signal and feeds back to the first operational amplifier 120 and the second operational amplifier 130.
In a kind of possible implementation, D/A converting circuit 151 can be identical with the structure of D/A converting circuit 152, can adopt structure as shown in Figure 3 b, particularly, D/A converting circuit can comprise encoder 360, latch 370, resistance 381, resistance 382, switch 391, switch 392, wherein, Mj[K] end is the input of D/A converting circuit, be connected with the output of quantizer 140, Pj[K] for Mj[K] signal exported by encoder 360, Vo1 end and Vo2 end are the output of D/A converting circuit, be connected with the first reverse input end with the first positive input of the first operational amplifier 120 respectively, or be connected with the second reverse input end with the second positive input of the second operational amplifier 130 respectively.
Between the first operational amplifier of the adc circuit of the present embodiment and the second operational amplifier, by resistance, be connected, the signal between the two is transmission continuously, is the sigma-delta ADC structure of a kind of continuous time, can improve the precision of adc circuit.In addition, in the adc circuit of the present embodiment, the first operational amplifier and switched resistor circuit can be realized the function that amplifier (PGA) is amplified in gain, without adopting independently PGA, the noise of having avoided PGA to introduce, and reduced the quantity of the amplifier, resistance and the electric capacity that adopt, can save chip cost.
embodiment 3
Fig. 4 illustrates the schematic diagram of ic for energy metering according to an embodiment of the invention, and this ic for energy metering can be for measuring the size of current in home circuit.As shown in Figure 4, this ic for energy metering can comprise: power supply 510, load to be measured 520, the first sampling resistor 530 and adc circuit 540.
Particularly, power supply 510, load to be measured 520 and the first sampling resistor 530 series connection are a loop, load 520 to be measured can be household electrical appliance etc., and described loop can be a circuit loop that comprises household electrical appliance in home circuit, and adc circuit 540 is in parallel with the first sampling resistor 530; Adc circuit 540 can be the adc circuit of structure described in employing embodiment 1 or embodiment 2; The two ends of the first sampling resistor 530 are connected with the two ends of the switched resistor circuit of adc circuit 540 respectively.The electric current of the first sampling resistor 530 of flowing through amplifies and converts digital signal to through adc circuit 540, by peripheral processes circuit, can accurately draw the size of electric current in described loop.
It should be noted that, can be in the switched resistor circuit of adc circuit 540 an external current source, for the input of the first operational amplifier provides a little electric current, thereby can provide common-mode point for this grade of amplifier, when therefore the ic for energy metering of the present embodiment can guarantee outside large-signal negative input, adc circuit 540 still can normally be worked, thereby realizes outside zero offset input, saves cost.And the precision of the adc circuit 540 that the ic for energy metering of the present embodiment adopts is high, thereby can guarantee the accuracy of this ic for energy metering Output rusults.
embodiment 4
Fig. 5 illustrates the schematic diagram of ic for energy metering according to another embodiment of the present invention, and this ic for energy metering can be for measuring the voltage swing in home circuit.As shown in Figure 5, this ic for energy metering can comprise: power supply 610, load to be measured 620, the second sampling resistor 630, the 3rd sampling resistor 640, the 4th sampling resistor 650 and adc circuit 660.
Particularly, power supply 610 and load to be measured 620 can form a circuit loop in home circuit, load 620 to be measured can be household electrical appliance etc., adc circuit 660 can be for adopting the adc circuit of any one structure in above-described embodiment, one end A of the second sampling resistor 630 connects the link C of power supply 610 and load 620 to be measured, and the other end B of the second sampling resistor 630 is connected with one end of the switched resistor circuit of adc circuit 660; One end A of the 3rd sampling resistor 640 is connected with one end of the switched resistor circuit of adc circuit 660, the other end B ground connection of described the 3rd sampling resistor 640; One end A of the 4th sampling resistor 650 is connected with the other end of the switched resistor circuit of adc circuit 660, the other end B ground connection of the 4th sampling resistor 650.
In a kind of possible implementation, the resistance of the 3rd sampling resistor 640 can be identical with the resistance of the 4th sampling resistor 650, by the voltage at the 3rd sampling resistor 640 two ends is amplified and converts digital signal to through adc circuit 660, by peripheral processes circuit, can accurately draw the voltage swing at load to be measured 620 two ends in described loop and the information such as stable whether.
In addition, can be in the switched resistor circuit of adc circuit 660 an external current source, for the input of the first operational amplifier provides a little electric current, thereby can provide common-mode point for this grade of amplifier, when therefore the ic for energy metering of the present embodiment can guarantee outside large-signal negative input, adc circuit 660 still can normally be worked, thereby realizes outside zero offset input, saves cost.And the precision of the adc circuit 660 that the ic for energy metering of the present embodiment adopts is high, thereby can guarantee the accuracy of this ic for energy metering Output rusults.
embodiment 5
Fig. 6 illustrates the schematic diagram of electric energy metered system according to an embodiment of the invention, and this electric energy metered system can be for measuring electric current and/or the voltage swing in home circuit.As shown in Figure 6, this electric energy metered system can comprise: electric current metering circuit and voltage measurement circuit.Wherein, described electric current metering circuit can be the ic for energy metering of employing embodiment 3, specifically can be referring to Fig. 4 and associated description thereof.Described voltage measurement circuit can be the ic for energy metering of employing embodiment 4, specifically can be referring to Fig. 5 and associated description thereof.Wherein, also the ic for energy metering in Fig. 4 and Fig. 5 can be combined into a circuit.As shown in Figure 6, electric energy metered system can comprise power supply 710, load to be measured 720, the first sampling resistor 530, the second sampling resistor 630, the 3rd sampling resistor 640, the 4th sampling resistor 650, adc circuit 540 and adc circuit 660.The power supply of electric current metering circuit and voltage measurement circuit, load to be measured can share, and during measuring voltage, also can comprise the first sampling resistor 530, and because the first sampling resistor resistance is less, dividing potential drop impact can be ignored.
It should be noted that, the electric current metering circuit of the electric energy metered system of the embodiment of the present invention and voltage measurement circuit can carry out the test and measuring of circuit simultaneously, also can separately carry out, those skilled in the art will be understood that, embodiment 3 all can be applicable to the present embodiment and can obtain identical beneficial effect with the possible implementation described in embodiment 4, repeats no more here.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (10)
1. an analog to digital converter adc circuit, is characterized in that, comprising:
Switched resistor circuit;
The first operational amplifier, its input is connected with described switched resistor circuit;
The second operational amplifier, its input is connected with the output of described the first operational amplifier by resistance;
Quantizer, its input is connected with the output of described the second operational amplifier, and its output compares the signal after quantification for exporting to the output signal of described the second operational amplifier;
Digital to analog converter module, its input is connected with the output of described quantizer, and its output feedback link is to the input of described the first operational amplifier and the input of described the second operational amplifier.
2. adc circuit according to claim 1, is characterized in that, described switched resistor circuit is comprised of two switch resistance arrays, and described switch resistance array comprises:
The first resistance, its one end connects the output of pending signal, and its other end connects the input of described the first operational amplifier;
At least one path switching circuit, it comprises the second resistance, the first switch and second switch; One end of described the second resistance is connected with one end of described the first resistance, and the other end of described the second resistance connects the first end of described the first switch; The second end ground connection of described the first switch, the 3rd end of described the first switch connects first of configuration module and controls pin; The second end of described second switch connects the other end of described the second resistance, and the first end of described second switch connects the other end of described the first resistance, and the 3rd end of described second switch connects second of described configuration module and controls pin.
3. adc circuit according to claim 2, is characterized in that,
Described the first operational amplifier comprises the first positive input, the first reverse input end, the first forward output and the first inverse output terminal, described the first positive input is connected with a described switch resistance array, described the first reverse input end is connected with switch resistance array described in another, between described the first positive input and described the first inverse output terminal, be connected with electric capacity, between the first forward output of described the first reverse input end and described the first operational amplifier, be connected with electric capacity.
4. according to the adc circuit described in claim 2 or 3, it is characterized in that,
Described the second operational amplifier comprises the second positive input, the second reverse input end, the second forward output and the second inverse output terminal, between described the second reverse input end and described the first inverse output terminal, be connected with resistance, between described the second positive input and described the first forward output, be connected with resistance, between described the second positive input and described the second inverse output terminal, be connected with electric capacity, between described the second reverse input end and described the second forward output, be connected with electric capacity.
5. adc circuit according to claim 4, is characterized in that, the first input end of described quantizer is connected with described the second forward output, and the second input of described quantizer is connected with described the second inverse output terminal.
6. according to the adc circuit described in claim 4 or 5, it is characterized in that, described digital to analog converter module comprises two D/A converting circuits, the output of a described D/A converting circuit is connected with described the first positive input and described the first reverse input end respectively, and described in another, the output of D/A converting circuit is connected with described the second positive input and described the second reverse input end respectively.
7. according to the adc circuit described in any one in claim 2 to 6, it is characterized in that, described the first switch and/or described second switch are field effect transistor;
The first end of described the first switch and/or described second switch, the second end and the 3rd end are respectively source electrode, the drain and gate of described field effect transistor.
8. an ic for energy metering, is characterized in that, comprising:
Power supply, load to be measured, the first sampling resistor and adc circuit;
Wherein, described power supply, described load to be measured and described the first sampling resistor series connection are a loop;
Described adc circuit is in parallel with described the first sampling resistor;
Described adc circuit adopts the adc circuit as described in any one in claim 1 to 7;
The two ends of described the first sampling resistor are connected with the two ends of the switched resistor circuit of described adc circuit respectively.
9. an ic for energy metering, is characterized in that, comprising:
Power supply, load to be measured, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor and adc circuit;
Wherein, described adc circuit adopts the adc circuit as described in any one in claim 1 to 7;
One end of described the second sampling resistor connects the link of described power supply and described load to be measured, and the other end of described the second sampling resistor is connected with one end of described the 3rd one end of sampling resistor and the switched resistor circuit of described adc circuit; The other end ground connection of described the 3rd sampling resistor; The other end of described the 4th one end of sampling resistor and the switched resistor circuit of described adc circuit is connected, the other end ground connection of described the 4th sampling resistor.
10. an electric energy metered system, is characterized in that, comprising:
Electric current metering circuit and voltage measurement circuit;
Wherein, described electric current metering circuit adopts ic for energy metering claimed in claim 8;
Described voltage measurement circuit adopts ic for energy metering claimed in claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310603166.8A CN103647557B (en) | 2013-11-25 | 2013-11-25 | Adc circuit, ic for energy metering and electric energy metered system |
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| CN201310603166.8A CN103647557B (en) | 2013-11-25 | 2013-11-25 | Adc circuit, ic for energy metering and electric energy metered system |
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| CN103647557A true CN103647557A (en) | 2014-03-19 |
| CN103647557B CN103647557B (en) | 2017-12-22 |
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| CN201310603166.8A Active CN103647557B (en) | 2013-11-25 | 2013-11-25 | Adc circuit, ic for energy metering and electric energy metered system |
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