CN103647557B - Adc circuit, ic for energy metering and electric energy metered system - Google Patents

Adc circuit, ic for energy metering and electric energy metered system Download PDF

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Publication number
CN103647557B
CN103647557B CN201310603166.8A CN201310603166A CN103647557B CN 103647557 B CN103647557 B CN 103647557B CN 201310603166 A CN201310603166 A CN 201310603166A CN 103647557 B CN103647557 B CN 103647557B
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circuit
input
switch
output
operational amplifier
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CN103647557A (en
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郭书苞
商忠志
尹德杨
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The present invention relates to a kind of adc circuit, ic for energy metering and electric energy metered system.Wherein, adc circuit includes switched resistor circuit;First operational amplifier, its input are connected with switched resistor circuit;Second operational amplifier, its input are connected by resistance with the output end of the first operational amplifier;Quantizer, its input are connected with the output end of the second operational amplifier, and its output end, which is used to export, is compared the signal after quantifying to the output signal of the second operational amplifier;The output end connection of digital analog converter module, its input and quantizer, the input of its output end feedback link to the first operational amplifier and the input of the second operational amplifier.Connected between the first operational amplifier and the second operational amplifier of the adc circuit of the embodiment of the present invention by resistance, signal therebetween continuously transmits, and is the sigma delta ADC structures of continuous time a kind of, it is possible to increase the precision of adc circuit.

Description

Adc circuit, ic for energy metering and electric energy metered system
Technical field
The present invention relates to electric energy metrical field, more particularly to a kind of adc circuit, ic for energy metering and electric energy metrical system System.
Background technology
In electric energy metrical field, it is necessary to analog-digital converter(English:Analog to Digital Converter, abbreviation: ADC)To the analog signal of input data signal is acquired, amplifies and is converted into for digital display circuit progress Digital Signal Processing.
The ADC in electric energy metrical field mainly has three kinds of implementations at present, and wherein first way is to amplify gain Device(English:Programable Gain Amplifier, abbreviation:PGA)It is integrated in sigma delta ADC sampling capacitance In, the size by adjusting sampling capacitance realizes different gain multiplication factors.This structure needs to increase Bootstrap (bootstrap)Circuit implements boost to PMOS switch, to transmit negative level signal;In addition, by adjust the size of electric capacity come Different gain multiplication factors is realized, can cause the loop bandwidth of ADC first order integrators reduces, and to reach reasonable bandwidth will Ask, it is necessary to increase the power consumption of amplifier.
The second way is input signal is first passed through control of the resistor-type PGA realizations of a continuous time to input gain System, while output a signal to and be biased in common-mode voltage, it is delivered directly to sigma delta ADC and is changed.This structure Adc circuit when inputting larger negative signal such as -1V, switch can not turn off, and can produce electric leakage, so as to cause PGA to export Signal error.
The third mode is that the work(of zero offset input is realized by reasonable disposition PGA and sigma delta ADC gain Can, and then realize and reduce the bandwidth to sigma delta ADC first order integrator, power dissipation design requirement.It is but this The adc circuit of structure needs extra exhibition ripple amplifier, and extra PGA adds noise source, it is necessary to increase filter circuit, so as to increase The complexity of circuit is added.
The adc circuit structure of three of the above implementation uses discrete time sigma delta ADC structure, this Structure is higher to the bandwidth requirement of amplifier in converter(Generally higher than 10 times), power consumption is larger.In addition, each path input needs One anti-aliasing to the progress of larger RC circuits, adds chip cost and PCB production cost.In addition, discrete time structure The requirement such as foundation of the ADC to amplifier it is higher, when realizing high-precision adc, it is necessary to select the demand of high performance amplifier.
The content 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 above-mentioned technical problem, according to one embodiment of the invention, there is provided a kind of analog-digital converter ADC electricity Road, including:Switched resistor circuit;First operational amplifier, its input are connected with the switched resistor circuit;Second computing is put Big device, its input are connected by resistance with the output end of first operational amplifier;Quantizer, its input and described the The output end connection of two operational amplifiers, its output end are used to export and the output signal of second operational amplifier are compared Compared with the signal after quantization;Digital analog converter module, its input are connected with the output end of the quantizer, and its output end feedback connects It is connected to the input of first operational amplifier and the input of second operational amplifier.
For above-mentioned adc circuit, in a kind of possible implementation, the switched resistor circuit is by two switch resistances Array forms, and the switch resistance array includes:First resistor, its one end connect the output end of pending signal, its other end Connect the input of first operational amplifier;An at least path switching circuit, it includes second resistance, first switch and second Switch;One end of the second resistance is connected with one end of the first resistor, described in the other end connection of the second resistance The first end of first switch;The second end ground connection of the first switch, the three-terminal link configuration module of the first switch First controlling switch;The other end of the second end connection second resistance of the second switch, the first of the second switch End connects the other end of the first resistor, and the second control of configuration module described in the three-terminal link of the second switch is drawn Pin.
For above-mentioned adc circuit, in a kind of possible implementation, it is positive that first operational amplifier includes first Input, the first reverse input end, the first positive output end and the first inverse output terminal, first positive input and one The switch resistance array connection, first reverse input end are connected with switch resistance array another described, and described first Electric capacity, first reverse input end and first computing are connected between positive input and first inverse output terminal Electric capacity is connected between first positive output end of amplifier.
For above-mentioned adc circuit, in a kind of possible implementation, it is positive that second operational amplifier includes second Input, the second reverse input end, the second positive output end and the second inverse output terminal, second reverse input end with it is described Resistance is connected between first inverse output terminal, is connected between second positive input and the first positive output end Resistance, electric capacity, second reverse input end are connected between second positive input and second inverse output terminal Electric capacity is connected between the described second positive output end.
For above-mentioned adc circuit, in a kind of possible implementation, the first input end of the quantizer and described the Two positive output end connections, the second input of the quantizer are connected with second inverse output terminal.
For above-mentioned adc circuit, in a kind of possible implementation, the digital analog converter module includes two digital-to-analogues Change-over circuit, the output end of a digital analog converter module respectively with first positive input and described first anti- Connected to input, the output end of another digital analog converter module respectively with second positive input and described Second reverse input end connects.
For above-mentioned adc circuit, in a kind of possible implementation, the first switch and/or the second switch For FET;The first switch and/or first end of the second switch, the second end and the 3rd end are respectively the field effect Should pipe source electrode, drain and gate.
In order to solve the above-mentioned technical problem, according to another embodiment of the present invention, there is provided a kind of ic for energy metering, bag Include:Power supply, load, the first sampling resistor and adc circuit to be measured;Wherein, the power supply, the load to be measured and described first are adopted Sample resistant series are a loop;The adc circuit is in parallel with first sampling resistor;The adc circuit is using the present invention The adc circuit of any one structure in embodiment;The both ends of first sampling resistor are electric with the switch of the adc circuit respectively The both ends connection of resistance circuit.
In order to solve the above-mentioned technical problem, according to another embodiment of the present invention, there is provided a kind of ic for energy metering, bag Include:Power supply, load to be measured, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor and adc circuit;Wherein, the ADC Circuit uses the adc circuit of any one structure in the embodiment of the present invention;One end of second sampling resistor connects the electricity The connection end of source and the load to be measured, one end of the other end of second sampling resistor and the 3rd sampling resistor and One end connection of the switched resistor circuit of the adc circuit;The other end ground connection of 3rd sampling resistor;4th sampling One end of resistance is connected with the other end of the switched resistor circuit of the adc circuit, another termination of the 4th sampling resistor Ground.
In order to solve the above-mentioned technical problem, according to another embodiment of the present invention, there is provided a kind of electric energy metered system, bag Include:Electric current metering circuit and voltage measurement circuit;Wherein, the electric current metering circuit uses any one in the embodiment of the present invention The ic for energy metering of structure;The voltage measurement circuit uses the electric energy metrical of any one structure in the embodiment of the present invention Circuit.
Beneficial effect
Connected between the first operational amplifier and the second operational amplifier of the adc circuit of the embodiment of the present invention by resistance Connect, signal therebetween continuously transmits, and is the sigma-delta ADC structures of continuous time a kind of, it is possible to increase ADC The precision of circuit.In addition, the first operational amplifier and switched resistor circuit can realize increasing in the adc circuit of the embodiment of the present invention Benefit amplification amplifier(PGA)Function, without use independent PGA, avoid the introduced noises of PGA, and reduce use Amplifier, the quantity of resistance and electric capacity, chip cost can be saved.
According to below with reference to the accompanying drawings becoming to detailed description of illustrative embodiments, further feature of the invention and aspect It is clear.
Brief description of the drawings
Comprising in the description and the accompanying drawing of a part for constitution instruction and specification together illustrate the present invention's Exemplary embodiment, feature and aspect, and for explaining the principle of the present invention.
Fig. 1 shows the structured flowchart of analog-digital converter adc circuit according to an embodiment of the invention;
Fig. 2 shows the physical circuit figure of analog-digital converter adc circuit according to another embodiment of the present invention;
Fig. 3 a show the switch resistance array and configuration mould of analog-digital converter adc circuit according to another embodiment of the present invention The circuit diagram of block annexation;
Fig. 3 b show the physical circuit figure of D/A converting circuit according to an embodiment of the invention;
Fig. 4 shows the schematic diagram of ic for energy metering according to an embodiment of the invention;
Fig. 5 shows the schematic diagram of ic for energy metering according to another embodiment of the present invention;
Fig. 6 shows the schematic diagram of electric energy metered system according to an embodiment of the invention.
Embodiment
Describe various exemplary embodiments, feature and the aspect of the present invention in detail below with reference to accompanying drawing.It is identical in accompanying drawing Reference represent the same or analogous element of function.Although the various aspects of embodiment are shown in the drawings, remove Non-specifically point out, it is not necessary to accompanying drawing drawn to scale.
Special word " exemplary " is meant " being used as example, embodiment or illustrative " herein.Here as " exemplary " Illustrated any embodiment should not necessarily be construed as preferred or advantageous over other embodiments.
In addition, in order to better illustrate the present invention, numerous details is given in embodiment below. It will be appreciated by those skilled in the art that without some details, the present invention can equally be implemented.In some instances, for Method, means, element and circuit well known to those skilled in the art are not described in detail, in order to highlight the purport of the present invention.
Embodiment 1
Fig. 1 shows the structured flowchart of analog-digital converter adc circuit according to an embodiment of the invention.As shown in figure 1, should Adc circuit mainly includes:Switched resistor circuit 110, the first operational amplifier 120, the second operational amplifier 130, quantizer 140 and digital analog converter module 150.Wherein, the input of the first operational amplifier 120 connects with switched resistor circuit 110 Connect, the input of the second operational amplifier 130 is connected by resistance 160 with the output end of the first operational amplifier 120, quantizer 140 input is connected with the output end of the second operational amplifier 130, and the output end of quantizer 140 is used to exporting to described the The output signal of two operational amplifiers is compared the signal after quantifying, the input and quantizer of digital analog converter module 150 140 output end connection, the input of the output end feedback link of digital analog converter module 150 to the first operational amplifier 120 With the input of the second operational amplifier 130.
In a kind of possible implementation, switched resistor circuit 110 can be made up of two switch resistance arrays, be passed through Switching off or closing for controlling switch electric resistance array, can realize the gain of different multiples.
Connected between the first operational amplifier and the second operational amplifier of the adc circuit of the present embodiment by resistance, two Signal between person continuously transmits, and is the sigma-delta ADC structures of continuous time a kind of, it is possible to increase adc circuit Precision.In addition, the first operational amplifier and switched resistor circuit can realize gain amplification fortune in the adc circuit of the present embodiment Put(PGA)Function, without use independent PGA, avoid the introduced noises of PGA, and reduce the amplifier of use, electricity Resistance and the quantity of electric capacity, can save chip cost.
Embodiment 2
Fig. 2 shows the physical circuit figure of analog-digital converter adc circuit according to another embodiment of the present invention.Label in Fig. 2 There is identical function with Fig. 1 identical components, for simplicity, omit the detailed description to these components.
In a kind of possible implementation, the switched resistor circuit 110 of the adc circuit shown in Fig. 2 is by two switch electricity Array 111,112 is hindered to form, wherein, switch resistance array 111 and switch resistance array 112 can be structure identical module.
As shown in Figure 3 a, switch resistance array 111,112 can include:First resistor 310 and four-way switch circuit.Its In, the output end of the pending signal of one end A connections of first resistor 310, the first operational amplifier of other end B connections 120 it is defeated Enter end.Four-way switch circuit can be structure identical module, and each path switching circuit can include a resistance and two are opened Close.Specifically, by taking a path switching circuit as an example, the on-off circuit includes a second resistance 320 and two switches 321,322, Wherein, one end A of second resistance 320 is connected with one end A of first resistor 310, the other end B connections first of second resistance 320 The first end S of switch 321;The second end D ground connection of first switch 321, the 3rd end G connection configuration modules of first switch 321 First controlling switch;The other end B of second end D connections second resistance 320 of second switch 322, the first end of second switch 322 The other end B of the S connections first resistor 310, the second controlling switch of the 3rd end G connection configuration modules of second switch 322.
Configuration module and the connection relationship diagram of switched resistor circuit 110 are as shown in Figure 3 a, succinct in order to become apparent from The annexation of configuration module and switched resistor circuit 110 is described, Fig. 3 a are only by taking a path switching circuit as an example, 3 way switch in addition Circuit is consistent with the annexation described in Fig. 3 a with the annexation of configuration module.First controlling switch of configuration module can be SELB pins, the second controlling switch can be SEL pins, and the configuration module is by controlling EN pins and S<1-0>The letter of pin Number, be worth accordingly to SELB pins and SEL pin configuration, so as to control that each group in four-way switch circuit switchs whether choosing It is logical, so as to realize the gain of different multiples.EN pins and S<1-0>The value of pin and the relation of gain can be such as the institutes of table 1 Show.
The EN pins of table 1 and S<1-0>The value of 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 Fig. 3 a, if the resistance of first resistor 310 is R, the resistance of second resistance 320 can be R, and the resistance of resistance 330 can Think R/2, the resistance of resistance 340 can be R/4, and the resistance of resistance 350 can be R/8., can if realizing 4 times of gains To cause first switch 321, the cut-off of switch 331, second switch 322, the conducting of switch 332, so that second resistance 320, electricity The connection of resistance 330;And cause switch 341, the conducting of switch 351, switch 342, the conducting of switch 352, to cause resistance 340, resistance 350 do not connect.If that is, by the equivalent resistance of switch resistance array 111 and switch resistance array 112 reduce one times, Then the gain of the adc circuit of the present embodiment, which is put, is twice.
In a kind of possible implementation, the switch in switch resistance array as shown in Figure 3 a can be field-effect Pipe, the first end S, the second end D and the 3rd end G are respectively the source S, drain D and grid G of FET.
It should be noted that although the switched resistor circuit knot of adc circuit is described using four-way switch circuit as example Structure as above, it is understood by one of ordinary skill in the art that the present invention answers not limited to this.In fact, user can like according to individual completely Good and/or the flexible configuration switch circuit of practical application scene way, to realize desired gain factor.
The switched resistor circuit structure of the adc circuit of the present embodiment, by one end B mono- of each resistance in four-way switch circuit Aspect is grounded by fet switch, and the input of operational amplifier is on the other hand connected to by another fet switch End, so as to thoroughly disconnect influence of the no resistance to adc circuit performance.In actual test metering process, all the way Using two switches in on-off circuit, another switch OFF can also be used when a switch can not turn off, can be avoided Because switch can not turn off and caused electrical leakage problems, so as to ensure to select accurate gain amplifier.
In a kind of possible implementation, as shown in Fig. 2 the first operational amplifier 120 include the first positive input, First reverse input end, the first positive output end and the first inverse output terminal, first positive input and switch resistance battle array Row 111 are connected, and first reverse input end is connected with switch resistance array 112, first positive input and described the Electric capacity 211 is connected between one inverse output terminal, is connected between first reverse input end and the first positive output end There is electric capacity 212.
In a kind of possible implementation, as shown in Fig. 2 the second operational amplifier 130 include the second positive input, Second reverse input end, the second positive output end and the second inverse output terminal, second reverse input end and described first anti- To resistance 162 is connected between output end, electricity is connected between second positive input and the first positive output end Resistance 161, is connected with electric capacity 221, second reverse input end between second positive input and the second inverse output terminal Electric capacity 222 is connected between the second positive output end.Resistance 161 can be with identical with the resistance of resistance 162.
It should be noted that the first operational amplifier 120 can be the amplifier for having chopper circuit, chopper circuit can drop The noise of low amplifier, so as to improve the measurement accuracy of adc circuit to a certain extent.In addition, electric capacity 211, electric capacity 212, electricity Appearance 221 and electric capacity 222 can improve amplifier stability, it is also ensured that the accuracy of amplifier output signal.
In a kind of possible implementation, as shown in Fig. 2 the first input end C1 of quantizer 140 is put with the second computing Second inverse output terminal of the second positive output end connection of big device 130, the second input C2 and the second operational amplifier 130 connects Connect.According to concrete application scene and it is actually needed, quantizer 140 can be the comparator of one, or 4 or 8 Comparator.
In a kind of possible implementation, turn as shown in Fig. 2 digital analog converter module 150 can include two digital-to-analogues Circuit 151,152 is changed, wherein, the output end of D/A converting circuit 151 is positive defeated with the first of the first operational amplifier 120 respectively Enter end to connect with the first reverse input end, the output end of D/A converting circuit 152 respectively with the second operational amplifier 130 second Positive input and the connection of the second reverse input end, the data signal for quantizer 140 to be exported are converted into analog signal simultaneously Feed back to the first operational amplifier 120 and the second operational amplifier 130.
In a kind of possible implementation, the structure of D/A converting circuit 151 and D/A converting circuit 152 can phase Together, structure as shown in Figure 3 b can be used, specifically, D/A converting circuit can include encoder 360, latch 370, Resistance 381, resistance 382, switch 391, switch 392, wherein, Mj [K] ends are the input of D/A converting circuit, with quantizer 140 output end connection, Pj [K] is the signal that Mj [K] is exported by encoder 360, and Vo1 ends and Vo2 ends are digital-to-analogue conversion The output end of circuit, it is connected respectively with the first positive input of the first operational amplifier 120 and the first reverse input end, or It is connected respectively with the second positive input of the second operational amplifier 130 and the second reverse input end.
Connected between the first operational amplifier and the second operational amplifier of the adc circuit of the present embodiment by resistance, two Signal between person continuously transmits, and is the sigma-delta ADC structures of continuous time a kind of, it is possible to increase adc circuit Precision.In addition, the first operational amplifier and switched resistor circuit can realize gain amplification fortune in the adc circuit of the present embodiment Put(PGA)Function, without use independent PGA, avoid the introduced noises of PGA, and reduce the amplifier of use, electricity Resistance and the quantity of electric capacity, can save chip cost.
Embodiment 3
Fig. 4 shows the schematic diagram of ic for energy metering according to an embodiment of the invention, and the ic for energy metering can be used In measuring the size of current in home circuit.As shown in figure 4, the ic for energy metering can include:Power supply 510, load to be measured 520th, the first sampling resistor 530 and adc circuit 540.
Specifically, power supply 510, the series connection of sampling resistor 530 of load to be measured 520 and first are a loop, load 520 to be measured Can be household electrical appliance etc., the loop can be a circuit loop for including household electrical appliance in home circuit, adc circuit 540 is in parallel with the first sampling resistor 530;Adc circuit 540 can be the ADC electricity using structure described in embodiment 1 or embodiment 2 Road;Both ends of the both ends of first sampling resistor 530 respectively with the switched resistor circuit of adc circuit 540 are connected.Flow through the first sampling The electric current of resistance 530 is amplified and converted to data signal through adc circuit 540, by peripheral processes circuit, can accurately draw institute State the size of electric current in loop.
It should be noted that can in the switched resistor circuit of adc circuit 540 an external current source, for first fortune The input for calculating amplifier provides a low current, so as to provide common-mode point, therefore the electricity of the present embodiment for this grade of amplifier When energy metering circuit can ensure outside big signal negative input, adc circuit 540 still can be with normal work, so as to realize outside zero Biasing input, saves cost.Also, the precision of adc circuit 540 is high used by the ic for energy metering of the present embodiment, so as to The accuracy of the ic for energy metering output result can be ensured.
Embodiment 4
Fig. 5 shows the schematic diagram of ic for energy metering according to another embodiment of the present invention, and the ic for energy metering can be with For measuring the voltage swing in home circuit.As shown in figure 5, the ic for energy metering can include:It is power supply 610, to be measured negative Carry the 620, second sampling resistor 630, the 3rd sampling resistor 640, the 4th sampling resistor 650 and adc circuit 660.
Specifically, power supply 610 and load 620 to be measured can form a circuit loop in home circuit, load to be measured 620 can be household electrical appliance etc., and adc circuit 660 can be the adc circuit using any one structure in above-described embodiment, the One end A connections power supply 610 of two sampling resistors 630 and the connection end C of load 620 to be measured, the other end of the second sampling resistor 630 B is connected with one end of the switched resistor circuit of adc circuit 660;3rd one end A of sampling resistor 640 and opening for adc circuit 660 One end connection of powered-down resistance circuit, the other end B ground connection of the 3rd sampling resistor 640;One end A of 4th sampling resistor 650 It 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 with the resistance of the 4th sampling resistor 650 Be worth it is identical, by the way that the voltage at the both ends of the 3rd sampling resistor 640 is amplified and converted into data signal through adc circuit 660, by outer Enclose process circuit, can accurately draw in the loop voltage swing at 620 both ends of load to be measured and whether the information such as stable.
Furthermore, it is possible to an external current source in the switched resistor circuit of adc circuit 660, is the first operational amplifier Input one low current is provided, so as to provide common-mode point for this grade of amplifier, therefore the electric energy metrical of the present embodiment is electric When road can ensure outside big signal negative input, adc circuit 660 still can with normal work, so as to realize outside zero offset input, Save cost.Also, the precision of adc circuit 660 is high used by the ic for energy metering of the present embodiment, thereby may be ensured that this The accuracy of ic for energy metering output result.
Embodiment 5
Fig. 6 shows the schematic diagram of electric energy metered system according to an embodiment of the invention, and the electric energy metered system can be used In measuring electric current and/or voltage swing in home circuit.As shown in fig. 6, the electric energy metered system can include:Electric current measures Circuit and voltage measurement circuit.Wherein, the electric current metering circuit can be the ic for energy metering using embodiment 3, specifically It may refer to Fig. 4 and its associated description.The voltage measurement circuit can be the ic for energy metering using embodiment 4, specifically It may refer to Fig. 5 and its associated description.Wherein, the ic for energy metering in Fig. 4 and Fig. 5 can also be combined into a circuit. As shown in fig. 6, electric energy metered system can include power supply 710, load to be measured 720, first sampling resistor 530, second sampling electricity Hinder the 630, the 3rd sampling resistor 640, the 4th sampling resistor 650, adc circuit 540 and adc circuit 660.Electric current metering circuit and electricity Press the power supply of metering circuit, load to be measured to share, when measuring voltage, the first sampling resistor 530 can also be included, due to the One sampling resistor resistance is smaller, and partial pressure influences to ignore.
It should be noted that the electric current metering circuit and voltage measurement circuit of the electric energy metered system of the embodiment of the present invention can To carry out the test and measuring of circuit simultaneously, it can also separate and carry out, those skilled in the art will be understood that embodiment 3 and the institute of embodiment 4 The possible implementation stated can be applied to the present embodiment and can obtain identical beneficial effect, repeat no more here.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims (9)

  1. A kind of 1. analog-digital converter adc circuit, it is characterised in that including:
    Switched resistor circuit;
    First operational amplifier, its input are connected with the switched resistor circuit;
    Second operational amplifier, its input are connected by resistance with the output end of first operational amplifier;
    Quantizer, its input are connected with the output end of second operational amplifier, and its output end is used to export to described the The output signal of two operational amplifiers is compared the signal after quantifying;
    Digital analog converter module, its input are connected with the output end of the quantizer, its output end feedback link to described The input of the input of one operational amplifier and second operational amplifier;
    Wherein, the switched resistor circuit is made up of two switch resistance arrays, a switch resistance array and the described first fortune The normal phase input end connection of amplifier is calculated, the inverting input of another switch resistance array and first operational amplifier connects Connect;
    The switch resistance array includes:
    First resistor, its one end connect the output end of pending signal, and its other end connects the defeated of first operational amplifier Enter end;
    An at least path switching circuit, it includes second resistance, first switch and second switch;One end of the second resistance and institute One end connection of first resistor is stated, the other end of the second resistance connects the first end of the first switch;Described first opens The the second end ground connection closed, the first controlling switch of the three-terminal link configuration module of the first switch;The second switch Second end connects the other end of the second resistance, and the first end of the second switch connects the other end of the first resistor, Second controlling switch of configuration module described in the three-terminal link of the second switch.
  2. 2. adc circuit according to claim 1, it is characterised in that
    First operational amplifier includes the first positive input, the first reverse input end, the first positive output end and first Inverse output terminal, first positive input are connected with a switch resistance array, first reverse input end with Another described switch resistance array connection, electricity is connected between first positive input and first inverse output terminal Hold, electric capacity is connected between first reverse input end and the first positive output end of first operational amplifier.
  3. 3. adc circuit according to claim 2, it is characterised in that
    Second operational amplifier includes the second positive input, the second reverse input end, the second positive output end and second Inverse output terminal, resistance is connected between second reverse input end and first inverse output terminal, described second is positive Resistance, second positive input and the described second reversely output are connected between input and the first positive output end Electric capacity is connected between end, electric capacity is connected between second reverse input end and the second positive output end.
  4. 4. adc circuit according to claim 3, it is characterised in that the first input end of the quantizer and described second Positive output end connection, the second input of the quantizer are connected with second inverse output terminal.
  5. 5. the adc circuit according to claim 3 or 4, it is characterised in that the digital analog converter module includes two digital-to-analogues Change-over circuit, the output end of a D/A converting circuit respectively with first positive input and described first reverse Input connects, the output end of another D/A converting circuit respectively with second positive input and described second Reverse input end connects.
  6. 6. adc circuit according to any one of claim 1 to 4, it is characterised in that the first switch and/or described Second switch is FET;
    The first switch and/or first end of the second switch, the second end and the 3rd end are respectively the FET Source electrode, drain and gate.
  7. A kind of 7. ic for energy metering, it is characterised in that including:
    Power supply, load, the first sampling resistor and adc circuit to be measured;
    Wherein, the power supply, the load to be measured and first sampling resistor series connection are a loop;
    The adc circuit is in parallel with first sampling resistor;
    The adc circuit is using the adc circuit as any one of claim 1 to 6;
    Both ends of the both ends of first sampling resistor respectively with the switched resistor circuit of the adc circuit are connected.
  8. A kind of 8. ic for energy metering, it is characterised in that including:
    Power supply, load to be measured, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor and adc circuit;
    Wherein, the adc circuit is using the adc circuit as any one of claim 1 to 6;
    One end of second sampling resistor connects the power supply and the connection end of the load to be measured, second sampling resistor One end of the other end and the 3rd sampling resistor and one end of switched resistor circuit of the adc circuit be connected;It is described The other end ground connection of 3rd sampling resistor;One end of 4th sampling resistor and the switched resistor circuit of the adc circuit The other end connects, the other end ground connection of the 4th sampling resistor.
  9. A kind of 9. electric energy metered system, it is characterised in that including:
    Electric current metering circuit and voltage measurement circuit;
    Wherein, the electric current metering circuit is using the ic for energy metering described in claim 7;
    The voltage measurement circuit is using the ic for energy metering described in claim 8.
CN201310603166.8A 2013-11-25 2013-11-25 Adc circuit, ic for energy metering and electric energy metered system Active CN103647557B (en)

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