CN102680910A - Supply current detection method and circuit - Google Patents
Supply current detection method and circuit Download PDFInfo
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Abstract
The invention provides a supply current detection method and a circuit, wherein the circuit comprises a detection circuit, an amplifying circuit, a code value sampling circuit and a control circuit, and the detection circuit is controlled by a control circuit so as to respectively input an object reference signal and a signal to be detected to the amplifying circuit; the amplifying circuit is controlled by the control circuit so as to respectively carry out treatment on the object reference signal and the signal to be detected; the code value sampling circuit can respectively sample the object reference signal and the signal to be detected after amplification to obtain a voltage sampling value of the reference signal and a voltage sampling value of the signal to be detected; and the control circuit calculates to the voltage value of the signal to be detected according to the voltage sampling value of the reference signal, the voltage sampling value of the signal to be detected and the voltage value of the object reference signal. According to the technical scheme in the invention, the object reference signal is taken as a base so as to adopt a relative measurement method, thereby improving measuring accuracy.
Description
Technical field
The present invention relates to the power supply detection technique, relate in particular to a kind of source current detection method and circuit.
Background technology
It is an emphasis that detects the electric current of various power supplys (for example accumulator) that source current detects always, also is a difficult point.Detection to source current mainly is to be serially connected in circuit through shunt (be actually a very little resistance value, be used for detecting DC current) at present, adopts the mode of difference to realize the detection to source current then.Fig. 1 is the circuit diagram that detects source current at present.As shown in Figure 1, shunt 11 is serially connected with power supply 12, both sides operational amplifiers of parallel connection (abbreviation amplifier) 13 of shunt 11.
To the application scenarios of big electric current such as present power supply 1000A, 10000A, need to select to support the shunt of big electric current (being that specification is bigger), electric current causes the shunt thermal value very big than conference, and it is bigger to cause detecting error, can't satisfy the demand of accuracy of detection.
Summary of the invention
The present invention provides a kind of source current detection method and circuit, in order to improve the precision that source current is detected.
The embodiment of the invention provides a kind of source current testing circuit, comprising: testing circuit, amplifying circuit, code value sample circuit and control circuit; Said testing circuit, said amplifying circuit and said code value sample circuit are connected successively, and said control circuit is connected with said testing circuit, said amplifying circuit and said code value sample circuit respectively;
Said testing circuit; Be used under the control of said control circuit, importing target reference signal and signal to be detected respectively to said amplifying circuit; Said target reference signal is used to be calculated the above voltage of signals value to be detected reference data is provided, and said signal to be detected is the signal that the shunt that is connected with power supply to be detected is exported;
Said amplifying circuit is used under the control of said control circuit, respectively said target reference signal and said signal to be detected being carried out processing and amplifying, and the target reference signal after will amplifying and signal to be detected offer said code value sample circuit respectively;
Said code value sample circuit; Be used for respectively the signal to be detected after target reference signal after the said amplification and the said amplification being sampled; Obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and said reference signal voltage sampled value and said signal voltage sampled value to be detected are offered said control circuit;
Said control circuit; Be used to control said testing circuit and import said target reference signal and said signal to be detected respectively to said amplifying circuit; Control said amplifying circuit and respectively said target reference signal and said signal to be detected are carried out processing and amplifying, and calculate said voltage of signals value to be detected according to the magnitude of voltage of said reference signal voltage sampled value, said signal voltage sampled value to be detected and said target reference signal.
The embodiment of the invention provides a kind of source current detection method, comprising:
Amplifying circuit under the control of the control circuit of the testing circuit in the source current testing circuit in said source current testing circuit in said source current testing circuit is imported target reference signal and signal to be detected respectively; Said target reference signal is used to be calculated said voltage of signals value to be detected reference data is provided, and said signal to be detected is the signal that the shunt that is connected with power supply to be detected is exported;
Said amplifying circuit carries out processing and amplifying to said target reference signal and said signal to be detected respectively under the control of said control circuit, and the target reference signal after will amplifying and signal to be detected offer the code value sample circuit in the said source current testing circuit respectively;
Said code value sample circuit is sampled to the signal to be detected after target reference signal after the said amplification and the said amplification respectively; Obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and said reference signal voltage sampled value and said signal voltage sampled value to be detected are offered said control circuit;
Said control circuit calculates said voltage of signals value to be detected according to the magnitude of voltage of said reference signal voltage sampled value, said signal voltage sampled value to be detected and said target reference signal.
Source current detection method and circuit that the embodiment of the invention provides; Control circuit control detection circuit is respectively to amplifying circuit input target reference signal and signal to be detected; Amplifying circuit offers the code value sample circuit after respectively target reference signal and signal to be detected being amplified; And target reference signal and voltage of signals to be detected after amplifying are sampled by the code value sample circuit; The voltage sample value is offered control circuit; Control circuit calculates voltage of signals to be detected according to the magnitude of voltage of the voltage sample value of target reference signal, voltage of signals sampled value to be detected and target reference signal, owing to being the method that benchmark has adopted relative measurement with the target reference signal, has improved measuring accuracy.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply; Obviously, the accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
The structural representation of the source current testing circuit that Figure 1A provides for one embodiment of the invention;
The structural representation of the source current testing circuit that Figure 1B provides for another embodiment of the present invention;
The structural representation of the source current testing circuit that Fig. 2 provides for further embodiment of this invention;
The process flow diagram of the source current detection method that Fig. 3 provides for one embodiment of the invention;
The process flow diagram of the source current detection method that Fig. 4 provides for another embodiment of the present invention;
The process flow diagram of the source current detection method that Fig. 5 provides for further embodiment of this invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The structural representation of the source current testing circuit that Figure 1A provides for one embodiment of the invention.As shown in Figure 1, the source current testing circuit of present embodiment comprises: amplifying circuit 10, testing circuit 11, code value sample circuit 14 and control circuit 15.Wherein, testing circuit 11, amplifying circuit 10 and code value sample circuit 14 are connected successively, and control circuit 15 is connected with testing circuit 11, amplifying circuit 10 and code value sample circuit 14 respectively.
Amplifying circuit 10 is used under the control of control circuit 15, respectively target reference signal and signal to be detected being carried out processing and amplifying, and the target reference signal after will amplifying and signal to be detected offer code value sample circuit 14 respectively.
Code value sample circuit 14; Be used for respectively target reference signal after amplifying and the signal to be detected after the amplification being sampled; Obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and reference signal voltage sampled value and signal voltage sampled value to be detected are offered control circuit 15.
The source current testing circuit that present embodiment provides; Control circuit control detection circuit is respectively to amplifying circuit input target reference signal and signal to be detected; Amplifying circuit offers the code value sample circuit after respectively target reference signal and signal to be detected being amplified; By the code value sample circuit target reference signal and voltage of signals to be detected after amplifying are sampled then; The voltage sample value is offered control circuit; Control circuit calculates voltage of signals to be detected according to the magnitude of voltage of the voltage sample value of target reference signal, voltage of signals sampled value to be detected and target reference signal, has realized with the target reference signal being that benchmark is treated the method that detection signal carries out relative measurement, has improved measuring accuracy.In addition, source current testing circuit that present embodiment provides adopts the relative measurement method to improve measuring accuracy, and is lower to the accuracy requirement of the amplifying circuit that uses; Allow the relatively low device of use cost to realize; For example therefore operational amplifier etc., also has the lower advantage of the cost of realization.
The structural representation of the source current testing circuit that Figure 1B provides for another embodiment of the present invention.Present embodiment can be realized based on Figure 1A illustrated embodiment.Shown in Figure 1B, the difference of circuit shown in the source current testing circuit of present embodiment and Figure 1A is: the amplifying circuit 10 of present embodiment comprises two parts, is respectively that appearance is with amplifying circuit 12 and multiple amplifying circuit 13.That is to say that the circuit of present embodiment comprises: testing circuit 11, appearance are with amplifying circuit 12, multiple amplifying circuit 13, code value sample circuit 14 and control circuit 15.Wherein, testing circuit 11, appearance are connected with amplifying circuit 12, multiple amplifying circuit 13 and code value sample circuit 14 successively, and control circuit 15 is connected with testing circuit 11, multiple amplifying circuit 13 and code value sample circuit 14 respectively.
Wherein, testing circuit 11 is used under the control of control circuit 15, importing target reference signal and signal to be detected to appearance respectively with amplifying circuit 12.Wherein, testing circuit 11 can provide many group reference signals, and target reference signal is one group of reference signal in many groups reference signal of testing circuit 11.Signal to be detected is the signal of the shunt output that is connected with power supply to be detected.
Concrete, testing circuit 11 can be connected with shunt, is used for obtaining signal to be detected from shunt.
Appearance is with amplifying circuit 12; Be used for target reference signal and signal to be detected are carried out preposition processing and amplifying (or perhaps first order processing and amplifying) respectively, and the signal to be detected after target reference signal after the preposition amplification and the preposition amplification is offered multiple amplifying circuit 13 respectively.
Optional, appearance can be built by devices such as operational amplifier and resistance with amplifying circuit 12.
Optional, appearance can also use existing appearance to realize with amplifying chip with amplifying circuit 12.
Wherein, Appearance is suitable for causing the tiny signal in the environment to amplify with amplifying circuit 12; So in the source current testing circuit of present embodiment with appearance with amplifying circuit 12 as pre-amplification circuit, help improving amplification precision to target reference signal and signal to be detected.
Multiple amplifying circuit 13; Be used for respectively the signal to be detected after target reference signal after the preposition amplification and the preposition amplification being carried out multiple processing and amplifying (or perhaps second level processing and amplifying) under the control of control circuit 15, and the signal to be detected after target reference signal after the multiple amplification and the multiple amplification is offered code value sample circuit 14 respectively.Multiple amplifying circuit 13 is on the basis of appearance with amplifying circuit 12, further target reference signal and signal to be detected is amplified.
Optional, multiple amplifying circuit 13 can be built by devices such as a plurality of operational amplifiers, resistance.
Code value sample circuit 14; Signal to be detected after target reference signal after being used for respectively multiple being amplified and multiple amplify is sampled; Obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and reference signal voltage sampled value and signal voltage sampled value to be detected are offered control circuit 15.
Optional, code value sample circuit 14 can be the AD sample circuit.
Wherein, the control circuit 15 of present embodiment can be realized by software, for example can be that (Central Processing Unit CPU), also can be realized by hardware CPU.
The source current testing circuit that present embodiment provides; Control circuit control detection circuit is imported target reference signal and signal to be detected to appearance with amplifying circuit respectively; Appearance carries out offering the multiple amplifying circuit after the preposition amplification to target reference signal and signal to be detected respectively with amplifying circuit; Control circuit control multiple amplifying circuit is done further processing and amplifying to target reference signal and signal to be detected respectively; And sample by the target reference signal and the voltage of signals to be detected of code value sample circuit after to further amplification; The voltage sample value is offered control circuit; Control circuit calculates voltage of signals to be detected according to the magnitude of voltage of the voltage sample value of target reference signal, voltage of signals sampled value to be detected and target reference signal, has realized with the target reference signal being that benchmark is treated the method that detection signal carries out relative measurement, has improved measuring accuracy.In addition; The source current testing circuit that present embodiment provides adopts the relative measurement method to improve measuring accuracy; Appearance to using is lower with the accuracy requirement of amplifying circuit and multiple amplifying circuit, the device realization that the permission use cost is relatively low, for example operational amplifier etc.; Therefore, also has the lower advantage of the cost of realization.
The structural representation of the source current testing circuit that Fig. 2 provides for further embodiment of this invention.Present embodiment can be realized based on Figure 1B illustrated embodiment.As shown in Figure 2, the testing circuit 11 of present embodiment can comprise first multiway analog switch 111.Wherein, every group of reference signal of testing circuit 11 and signal to be detected are connected with a way switch of first multiway analog switch 111 respectively, and the output terminal of first multiway analog switch 111 is connected with amplifying circuit 12 with appearance.
Based on this, control circuit 15 specifically can be used for controlling a way switch conducting that is connected with target reference signal in first multiway analog switch 111, imports the purpose of target reference signal with amplifying circuit 12 to appearance with control detection circuit 11.
In this explanation; Control circuit 15 once can only be controlled the way switch conducting in first multiway analog switch 111; Promptly once can only with amplifying circuit 12 a kind of signal be provided to appearance by control detection circuit 11, this signal or target reference signal or signal to be detected.
Further, the testing circuit 11 of present embodiment also comprises: input switch 112.This input switch 112 respectively with shunt and first multiway analog switch 111 in the way switch that is connected with signal to be detected connect.Wherein, shunt is connected with power supply to be detected, is used for power supply to be detected is shunted.The testing circuit 11 of present embodiment obtains signal to be detected through its input switch 112 from shunt, and gives first multiway analog switch 111 with signal conveys to be detected.
In addition, as shown in Figure 2, the testing circuit 11 of present embodiment also comprises the auxiliary circuit that some are made up of resistance or diode, and these auxiliary circuits are no longer explained at this.
The testing circuit 11 of present embodiment adopts input switch to be connected with shunt; Rather than adopt fixed form to be connected with shunt; Help difference power supply to be detected is detected; Make and to detect a plurality of power supplys to be detected through using a source current testing circuit, help practicing thrift the detection cost as a whole.
As shown in Figure 2, the appearance of present embodiment is mainly built by three operational amplifiers and six resistance with amplifying circuit 12, but is not limited thereto.The code value sample circuit 14 of present embodiment is an AD sample circuit.
Further, the multiple amplifying circuit 13 of present embodiment comprises a plurality of amplification channels 131 and second multiway analog switch 132.Wherein, each amplification channel 131 is connected with a way switch of second multiway analog switch 132, and the output terminal of second multiway analog switch 132 is connected with code value sample circuit 14.Wherein, the enlargement factor of each amplification channel 131 is different in a plurality of amplification channels 131.As shown in Figure 2, the enlargement factor of an amplification channel 131 is 1, promptly directly be connected with second multiway analog switch 132 a road; The times magnification number average of other amplification channels 131 mainly is made up of operational amplifier greater than 1, and different according to the number of the different employed operational amplifiers of enlargement factor.For ease of diagram, the multiple amplifying circuit 13 that provides among Fig. 2 comprises three amplification channels 131.
Based on above-mentioned, control circuit 15 specifically can be used for controlling a way switch conducting of second multiway analog switch 132, respectively the signal to be detected after target reference signal after the preposition amplification and the preposition amplification is carried out the multiple processing and amplifying with control multiple amplifying circuit 13.The enlargement factor of said multiple processing and amplifying for second multiway analog switch 132 in the enlargement factor of the amplification channel that is connected of the way switch that is switched on.That is to say; Control circuit 15 is through certain way switch conducting in control second multiway analog switch 132, makes multiple amplifying circuit 13 carry out the multiple processing and amplifying through the amplification channel that is connected with switch that this is switched on target reference signal and the signal to be detected after the preposition amplification after to preposition amplification.Wherein, the enlargement factor of multiple amplifying circuit is the enlargement factor of carrying out the amplification channel of processing and amplifying.
Optional; Many groups reference signal of testing circuit 11 can be two groups of reference signals, and (IREF1 is AGND1) with second group of reference signal (IREF2 to be respectively first group of reference signal; AGND2), and the magnitude of voltage of first group of reference signal less than the magnitude of voltage of second group of reference signal.Then control circuit 15 specifically can be used for the voltage of signals estimated value to be detected and the predeterminated voltage thresholding that obtain are in advance compared; When voltage of signals estimated value to be detected during more than or equal to the predeterminated voltage thresholding; Select second group of reference signal as target reference signal; When voltage of signals estimated value to be detected during, select first group of reference signal as target reference signal less than the predeterminated voltage thresholding; Control a way switch conducting that is connected with target reference signal in first multiway analog switch 111 then, import target reference signal to appearance with amplifying circuit 12 with control detection circuit 11.Wherein, voltage of signals estimated value to be detected is that the magnitude of voltage of treating detection signal is in advance estimated to obtain.
Based on above-mentioned; Control circuit 15 specifically can be used for voltage of signals estimated value to be detected respectively with first group of reference signal in magnitude of voltage and the magnitude of voltage of second group of reference signal compare; Confirm the target enlargement factor according to comparative result; Controlling in second multiway analog switch 132 with enlargement factor then is the way switch conducting that the amplification channel 131 of the target enlargement factor determined is connected, and respectively the signal to be detected after target reference signal after the preposition amplification and the preposition amplification is carried out the multiple processing and amplifying that enlargement factor is determined target enlargement factor with control multiple amplifying circuit 13.
Further; When control circuit 15 specifically is used in voltage of signals estimated value to be detected greater than the magnitude of voltage of second group of reference signal; Confirm that the target enlargement factor is first enlargement factor; In voltage of signals estimated value to be detected during less than the magnitude of voltage of first group of reference signal; Confirm that the target enlargement factor is second enlargement factor, during less than the magnitude of voltage of second group of reference signal, confirm that the target enlargement factor is the 3rd enlargement factor greater than the magnitude of voltage of first group of reference signal in voltage of signals estimated value to be detected; Wherein, second enlargement factor is greater than the 3rd enlargement factor, and the 3rd enlargement factor is greater than first enlargement factor.
In conjunction with the structure that comprises three amplification channels 131 shown in Figure 2, be followed successively by first via amplification channel 131, the second road amplification channel 131 and Third Road amplification channel 131 from top to bottom.Correspondingly, the enlargement factor of the corresponding first via amplification channel 131 of first enlargement factor can be 1; The enlargement factor of corresponding the second road amplification channel 131 of the 3rd enlargement factor; The enlargement factor of the corresponding Third Road amplification channel 131 of second enlargement factor.
Further, every group of reference signal comprises reference signal and earth signal in the present embodiment.Accordingly, the target reference signal of present embodiment use also comprises reference signal and earth signal; Correspondingly, the reference signal voltage sampled value comprises reference signal voltage sample value and earth signal voltage sample value.Wherein, the earth signal in the reference signal is mainly used in to be removed with the common-mode signal of amplifier in the amplifying circuit 12 appearance through adding earth signal, can further improve accuracy of detection.
Based on above-mentioned, control circuit 15 specifically can calculate voltage of signals value to be detected according to formula (1).
（M
v-M
GND)/V=（M
IREF-M
GND)/V
IREF （1）
Wherein, M
vBe signal voltage sampled value to be detected; M
IREFBe reference signal voltage sample value; M
GNDBe earth signal voltage sample value; V
IREFMagnitude of voltage for target reference signal; V is a voltage of signals value to be detected.
In this explanation, wherein the magnitude of voltage of target reference signal is actually the magnitude of voltage of the reference signal in the target reference signal, and the magnitude of voltage of other reference signals in fact also is the magnitude of voltage of reference signal wherein.
In this explanation; Draw through experimental verification: under the shunt specification of 25mv/500A; And under the outside first group of reference signal that provides and the second group of more stable prerequisite of reference signal, the accuracy of detection of the source current testing circuit of present embodiment can reach 0.5%.
By above-mentioned visible; The source current testing circuit of present embodiment can be accomplished the detection of multichannel electric current through input switch, through first multiway analog switch can accomplish many group reference signals (comprising reference signal and earth signal) selection, can be that different signals to be detected are selected different target reference signal; Simultaneously can be under the situation of difference signal to be detected through the multiple amplifying circuit that comprises the multichannel amplification channel; Select different magnifications, accomplish signal sampling by the code value sample circuit then, and finally adopt formula (1) to accomplish the relative measurement of treating detection signal by control circuit; Greatly improve measuring accuracy, reduced the measurement cost.
Further specify, in order further to improve accuracy of detection, need to guarantee the accuracy of reference signal, the source current testing circuit of present embodiment can also be proofreaied and correct reference signal for this reason.Concrete trimming process is: with the reference signal in the reference signal to be corrected (abbreviating reference signal to be corrected as) as signal to be detected; Use the big or small known of outside input and known signal that precision is very high as target reference signal; Control circuit 15 control detection circuit 11 offer appearance with amplifying circuit 12 with known signal and reference signal to be corrected respectively; Appearance carries out preposition amplification to known signal and reference signal to be corrected respectively with amplifying circuit 12, respectively known signal after the preposition amplification and reference signal to be corrected is offered multiple amplifying circuit 13 then.Control circuit 15 is confirmed the target enlargement factor according to the magnitude relationship of the voltage of the voltage estimated value of reference signal to be corrected and known signal; And the corresponding amplification channel 131 in the control multiple amplifying circuit 13 carries out the multiple processing and amplifying that enlargement factor is the target enlargement factor determined to the known signal after the preposition amplification and reference signal to be corrected respectively; Known signal and reference signal to be corrected after respectively multiple being amplified then offer code value sample circuit 14; Known signal after code value sample circuit 14 amplifies multiple respectively and reference signal to be corrected are sampled; Sampled value is offered control circuit 15; Calculate the accurate magnitude of voltage of reference signal to be corrected at last according to formula (1) by control circuit 15; Guarantee the accuracy of reference signal, handled laying the foundation for the follow-up detection of carrying out signal to be detected based on reference signal, helped improving accuracy of detection.
To specify the principle of work of the source current testing circuit that the embodiment of the invention provides below through specific embodiment.
The process flow diagram of the source current detection method that Fig. 3 provides for one embodiment of the invention.As shown in Figure 3, the method for present embodiment comprises:
Amplifying circuit under the control of the control circuit of testing circuit in the source current testing circuit in step 301, the source current testing circuit in the source current testing circuit is imported target reference signal and signal to be detected respectively.
Wherein, target reference signal is used to be calculated voltage of signals value to be detected reference data is provided, and signal to be detected is the signal that the shunt that is connected with power supply to be detected is exported.
The source current testing circuit of present embodiment comprises testing circuit, amplifying circuit, code value sample circuit and control circuit, and its concrete structure can be referring to shown in Figure 1A.
In the present embodiment; Control circuit control detection circuit is respectively to amplifying circuit input target reference signal and signal to be detected; Amplifying circuit offers the code value sample circuit after respectively target reference signal and signal to be detected being amplified; And target reference signal and voltage of signals to be detected after amplifying are sampled by the code value sample circuit; The voltage sample value is offered control circuit; Control circuit calculates voltage of signals to be detected according to the magnitude of voltage of the voltage sample value of target reference signal, voltage of signals sampled value to be detected and target reference signal, owing to being the method that benchmark has adopted relative measurement with the target reference signal, has improved measuring accuracy.
The process flow diagram of the source current detection method that Fig. 4 provides for another embodiment of the present invention.As shown in Figure 4, the method for present embodiment comprises:
Amplifying circuit under the control of the control circuit of testing circuit in the source current testing circuit in step 401, the source current testing circuit in the source current testing circuit is imported target reference signal and signal to be detected respectively.
In the present embodiment, testing circuit comprises many group reference signals, and target reference signal is one group of reference signal in many groups reference signal of testing circuit, is used to equally to calculate voltage of signals value to be detected reference data is provided.
In the present embodiment, amplifying circuit comprises that appearance is with amplifying circuit and multiple amplifying circuit; Testing circuit comprises first multiway analog switch.Every group of reference signal in the testing circuit is connected with a way switch of first multiway analog switch respectively with signal to be detected, and the output terminal of first multiway analog switch is connected with amplifying circuit with appearance.
Based on above-mentioned, the embodiment of step 401 can be: a way switch conducting that is connected with target reference signal in first multiway analog switch of control circuit control detection circuit; Correspondingly, testing circuit is imported target reference signal to appearance with amplifying circuit through a way switch that is switched on.Control circuit is controlled a way switch conducting that is connected with signal to be detected in first multiway analog switch; Correspondingly, testing circuit is imported to be detected signal to appearance with amplifying circuit through a way switch that is switched on.
Further, testing circuit can also comprise: input switch, said input switch respectively with shunt and first multiway analog switch in the way switch that is connected with signal to be detected connect, be used for signal to be detected is offered the first multichannel module switch.
Optional, organize reference signal more and comprise first group of reference signal and second group of reference signal, and the magnitude of voltage of first group of reference signal is less than the magnitude of voltage of second group of reference signal.
Comprise before the way switch conducting that then is connected with target reference signal in first multiway analog switch of control circuit control detection circuit: control circuit compares voltage of signals estimated value to be detected and predeterminated voltage thresholding; When voltage of signals estimated value to be detected during more than or equal to the predeterminated voltage thresholding; Select second group of reference signal as target reference signal; When voltage of signals estimated value to be detected during, select first group of reference signal as target reference signal less than the predeterminated voltage thresholding.
Appearance in step 402, the amplifying circuit carries out preposition processing and amplifying with amplifying circuit respectively to target reference signal and signal to be detected, and the signal to be detected after target reference signal after the preposition amplification and the preposition amplification is offered the multiple amplifying circuit in the amplifying circuit respectively.
In the present embodiment, the multiple amplifying circuit comprises a plurality of amplification channels and second multiway analog switch.Each amplification channel is connected with a way switch of second multiway analog switch, and the output terminal of second multiway analog switch is connected with the code value sample circuit.Wherein, the enlargement factor of each amplification channel is different in a plurality of amplification channels.
Based on above-mentioned, the multiple amplifying circuit is specially respectively the signal to be detected after target reference signal after the preposition amplification and the preposition amplification being carried out the multiple processing and amplifying under the control of control circuit: a way switch conducting of second multiway analog switch of control circuit control multiple amplifying circuit; Correspondingly; The multiple amplifying circuit carries out the multiple processing and amplifying to the signal to be detected after target reference signal after the preposition amplification and the preposition amplification respectively, the enlargement factor of said multiple processing and amplifying for second multiway analog switch in the enlargement factor of the amplification channel that is connected of the way switch that is switched on.
Optional; Comprise first group of reference signal and second group of reference signal if organize reference signal more; Then a way switch conducting of second multiway analog switch of control circuit control multiple amplifying circuit specifically can comprise: the voltage of signals estimated value to be detected that control circuit will obtain in advance respectively with first group of reference signal in magnitude of voltage and the magnitude of voltage of second group of reference signal compare, confirm the target enlargement factor according to comparative result; Controlling in second multiway analog switch with enlargement factor then is the way switch conducting that the amplification channel of target enlargement factor is connected.
Further; Control circuit confirms that according to comparative result the target enlargement factor can comprise: control circuit is in voltage of signals estimated value to be detected during greater than the magnitude of voltage of second group of reference signal; Confirm that the target enlargement factor is first enlargement factor; In voltage of signals estimated value to be detected during less than the magnitude of voltage of first group of reference signal; Confirm that the target enlargement factor is second enlargement factor, during less than the magnitude of voltage of second group of reference signal, confirm that the target enlargement factor is the 3rd enlargement factor greater than the magnitude of voltage of first group of reference signal in voltage of signals estimated value to be detected.Wherein, second enlargement factor is greater than the 3rd enlargement factor, and the 3rd enlargement factor is greater than first enlargement factor.
Signal to be detected after target reference signal after step 404, code value sample circuit amplify multiple respectively and multiple amplify is sampled; Obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and reference signal voltage sampled value and signal voltage sampled value to be detected are offered control circuit.
Optional, each reference signal comprises reference signal and earth signal.Accordingly, the target reference signal of present embodiment also comprises reference signal and earth signal, and then the reference signal voltage sampled value comprises reference signal voltage sample value and earth signal voltage sample value.
Then control circuit can calculate voltage of signals value to be detected according to formula (1).About the relevant description of formula (1), can be referring to the description of the foregoing description.
In the present embodiment; Control circuit control detection circuit is imported target reference signal and signal to be detected to appearance with amplifying circuit respectively; Appearance carries out offering the multiple amplifying circuit after the preposition amplification to target reference signal and signal to be detected respectively with amplifying circuit; Control circuit control multiple amplifying circuit is done further processing and amplifying to target reference signal and signal to be detected respectively; And sample by the target reference signal and the voltage of signals to be detected of code value sample circuit after to further amplification; The voltage sample value is offered control circuit; Control circuit calculates voltage of signals to be detected according to the magnitude of voltage of the voltage sample value of target reference signal, voltage of signals sampled value to be detected and target reference signal, has realized with the target reference signal being that benchmark is treated the method that detection signal carries out relative measurement, has improved measuring accuracy.In addition; The source current testing circuit that present embodiment provides adopts the relative measurement method to improve measuring accuracy; Appearance to using is lower with the accuracy requirement of amplifying circuit and multiple amplifying circuit, the device realization that the permission use cost is relatively low, for example operational amplifier etc.; Therefore, also has the lower advantage of the cost of realization.
In this explanation, in above-mentioned each method embodiment, the source current testing circuit is independently to target reference signal with the processing procedure of treating detection signal, is not to carry out simultaneously.For example, target reference signal corresponding reference signal voltage sampled value can handled and obtain to the source current testing circuit earlier to target reference signal; Then, the source current testing circuit is treated detection signal again and is handled and obtain signal voltage sampled value to be detected, calculates voltage of signals to be detected according to formula (1) more at last.Again for example, the source current testing circuit can be treated detection signal earlier and handle and obtain signal voltage sampled value to be detected; Then, the source current testing circuit is handled target reference signal and is obtained target reference signal corresponding reference signal voltage sampled value, calculates voltage of signals to be detected according to formula (1) more at last.
Below in conjunction with the structure of source current testing circuit shown in Figure 2, earlier target reference signal is handled with the source current testing circuit, and then treated the detailed implementation process that detection signal is treated to example explanation said method.This implementation process is as shown in Figure 5, specifically comprises:
Voltage of signals estimated value to be detected and predeterminated voltage thresholding that step 501, control circuit will obtain in advance compare; When voltage of signals estimated value to be detected during more than or equal to the predeterminated voltage thresholding; Select second group of reference signal as target reference signal; When voltage of signals estimated value to be detected during, select first group of reference signal as target reference signal less than the predeterminated voltage thresholding.
This step 501 is an optional step.Wherein, voltage of signals estimated value to be detected is that the magnitude of voltage of treating detection signal is in advance estimated to obtain.
A way switch conducting that is connected with target reference signal in first multiway analog switch of step 502, control circuit control detection circuit; Testing circuit is imported target reference signal to appearance with amplifying circuit through a way switch that is switched on.
Step 503, appearance carry out preposition processing and amplifying with amplifying circuit to target reference signal, and the target reference signal after the preposition amplification is offered the multiple amplifying circuit.
One way switch conducting of second multiway analog switch of step 504, control circuit control multiple amplifying circuit; The multiple amplifying circuit carries out the multiple processing and amplifying through the amplification channel that is connected with a way switch that the is switched on target reference signal after to preposition amplification, and the target reference signal after multiple amplified offers the code value sample circuit.
Optional; Comprise first group of reference signal and second group of reference signal if organize reference signal more; Then a way switch conducting of second multiway analog switch of control circuit control multiple amplifying circuit specifically can comprise: control circuit with voltage of signals estimated value to be detected respectively with first group of reference signal in magnitude of voltage and the magnitude of voltage of second group of reference signal compare; Confirm the target enlargement factor according to comparative result, controlling in second multiway analog switch with enlargement factor then is the way switch conducting that the amplification channel of target enlargement factor is connected.
Target reference signal after step 505, code value sample circuit amplify multiple is sampled, and obtains the reference signal voltage sampled value and the reference signal voltage sampled value is offered control circuit.
One way switch conducting of second multiway analog switch of step 508, control circuit control multiple amplifying circuit; The multiple amplifying circuit carries out the multiple processing and amplifying through the amplification channel that is connected with a way switch that the is switched on signal to be detected after to preposition amplification, and the signal to be detected after multiple amplified offers the code value sample circuit.
Signal to be detected after step 509, code value sample circuit amplify multiple is sampled, and obtains signal voltage sampled value to be detected and signal voltage sampled value to be detected is offered control circuit.
Optional, control circuit can calculate voltage of signals value to be detected according to formula (1).
In the present embodiment; Control circuit control detection circuit is imported target reference signal and signal to be detected to appearance with amplifying circuit respectively; Appearance carries out offering the multiple amplifying circuit after the preposition amplification to target reference signal and signal to be detected respectively with amplifying circuit; Control circuit control multiple amplifying circuit is done further processing and amplifying to target reference signal and signal to be detected respectively; And sample by the target reference signal and the voltage of signals to be detected of code value sample circuit after to further amplification; The voltage sample value is offered control circuit; Control circuit calculates voltage of signals to be detected according to the magnitude of voltage of the voltage sample value of target reference signal, voltage of signals sampled value to be detected and target reference signal, has realized with the target reference signal being that benchmark is treated the method that detection signal carries out relative measurement, has improved measuring accuracy.In addition; The source current testing circuit that present embodiment provides adopts the relative measurement method to improve measuring accuracy; Appearance to using is lower with the accuracy requirement of amplifying circuit and multiple amplifying circuit, the device realization that the permission use cost is relatively low, for example operational amplifier etc.; Therefore, also has the lower advantage of the cost of realization.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each method embodiment can be accomplished through the relevant hardware of programmed instruction.Aforesaid program can be stored in the computer read/write memory medium.This program the step that comprises above-mentioned each method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
What should explain at last is: above each embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although the present invention has been carried out detailed explanation with reference to aforementioned each embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, perhaps to wherein part or all technical characteristic are equal to replacement; And these are revised or replacement, do not make the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (17)
1. a source current testing circuit is characterized in that, comprising: testing circuit, amplifying circuit, code value sample circuit and control circuit; Said testing circuit, said amplifying circuit and said code value sample circuit are connected successively, and said control circuit is connected with said testing circuit, said amplifying circuit and said code value sample circuit respectively;
Said testing circuit; Be used under the control of said control circuit, importing target reference signal and signal to be detected respectively to said amplifying circuit; Said target reference signal is used to be calculated said voltage of signals value to be detected reference data is provided, and said signal to be detected is the signal that the shunt that is connected with power supply to be detected is exported;
Said amplifying circuit is used under the control of said control circuit, respectively said target reference signal and said signal to be detected being carried out processing and amplifying, and the target reference signal after will amplifying and signal to be detected offer said code value sample circuit respectively;
Said code value sample circuit; Be used for respectively the signal to be detected after target reference signal after the said amplification and the said amplification being sampled; Obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and said reference signal voltage sampled value and said signal voltage sampled value to be detected are offered said control circuit;
Said control circuit; Be used to control said testing circuit and import said target reference signal and said signal to be detected respectively to said amplifying circuit; Control said amplifying circuit and respectively said target reference signal and said signal to be detected are carried out processing and amplifying, and calculate said voltage of signals value to be detected according to the magnitude of voltage of said reference signal voltage sampled value, said signal voltage sampled value to be detected and said target reference signal.
2. source current testing circuit according to claim 1 is characterized in that, said amplifying circuit comprises: appearance is with amplifying circuit and multiple amplifying circuit;
Said appearance is used amplifying circuit, is used for said target reference signal and said signal to be detected are carried out preposition processing and amplifying respectively, and the signal to be detected after target reference signal after the preposition amplification and the preposition amplification is offered said multiple amplifying circuit respectively;
Said multiple amplifying circuit; Be used for respectively the signal to be detected after target reference signal after the said preposition amplification and the said preposition amplification being carried out the multiple processing and amplifying under the control of said control circuit, and target reference signal and the signal to be detected after the multiple amplification offered said code value sample circuit respectively.
3. source current testing circuit according to claim 2 is characterized in that, said target reference signal is one group of reference signal in many groups reference signal of said testing circuit;
Said testing circuit comprises first multiway analog switch; Every group of reference signal in the said testing circuit is connected with a way switch of said first multiway analog switch respectively with said signal to be detected, and the output terminal of said first multiway analog switch is connected with amplifying circuit with said appearance;
Said control circuit specifically is used for controlling the way switch conducting that said first multiway analog switch is connected with said target reference signal; Import said target reference signal to said appearance with amplifying circuit to control said testing circuit; Control a way switch conducting that is connected with said signal to be detected in said first multiway analog switch, import said signal to be detected to said appearance with amplifying circuit to control said testing circuit.
4. source current testing circuit according to claim 3; It is characterized in that; Said testing circuit also comprises: input switch, said input switch respectively with said shunt and said first multiway analog switch in the way switch that is connected with said signal to be detected connect.
5. according to claim 3 or 4 described source current testing circuits, it is characterized in that said multiple amplifying circuit comprises a plurality of amplification channels and second multiway analog switch; Each said amplification channel is connected with a way switch of said second multiway analog switch, and the output terminal of said second multiway analog switch is connected with said code value sample circuit, and the enlargement factor of each amplification channel is different in said a plurality of amplification channels;
Said control circuit specifically is used to control a way switch conducting of said second multiway analog switch; With control said multiple amplifying circuit respectively to the target reference signal after amplifying said for the first time with amplify for the first time after signal to be detected carry out the multiple processing and amplifying, the enlargement factor of said multiple processing and amplifying for said second multiway analog switch in the enlargement factor of the amplification channel that is connected of the way switch that is switched on.
6. source current testing circuit according to claim 5 is characterized in that, said many group reference signals comprise first group of reference signal and second group of reference signal, and the magnitude of voltage of said first group of reference signal is less than the magnitude of voltage of said second group of reference signal;
Said control circuit specifically is used for; The voltage of signals estimated value said to be detected and the predeterminated voltage thresholding that obtain are in advance compared; When said voltage of signals estimated value to be detected during more than or equal to said predeterminated voltage thresholding; Select said second group of reference signal as said target reference signal,, select said first group of reference signal as said target reference signal when said voltage of signals estimated value to be detected during less than said predeterminated voltage thresholding; Control a way switch conducting that is connected with said target reference signal in said first multiway analog switch then, import said target reference signal to said appearance with amplifying circuit to control said testing circuit.
7. source current testing circuit according to claim 6; It is characterized in that; Said control circuit specifically is used for said voltage of signals estimated value to be detected is compared with the magnitude of voltage of said first group of reference signal and the magnitude of voltage of said second group of reference signal respectively; Confirm the target enlargement factor according to comparative result; Controlling in said second multiway analog switch with enlargement factor then is the way switch conducting that the amplification channel of said target enlargement factor is connected, and respectively the signal to be detected after target reference signal after the said preposition amplification and the said preposition amplification is carried out the multiple processing and amplifying that enlargement factor is said target enlargement factor to control said multiple amplifying circuit.
8. source current testing circuit according to claim 7; It is characterized in that; Said control circuit specifically is used for, and during greater than the magnitude of voltage of said second group of reference signal, confirms that said target enlargement factor is first enlargement factor in said voltage of signals estimated value to be detected; In said voltage of signals estimated value to be detected during less than the magnitude of voltage of said first group of reference signal; Confirm that said target enlargement factor is second enlargement factor, during less than the magnitude of voltage of said second group of reference signal, confirm that said target enlargement factor is the 3rd enlargement factor greater than the magnitude of voltage of said first group of reference signal in said voltage of signals estimated value to be detected; Wherein, said second enlargement factor is greater than said the 3rd enlargement factor, and said the 3rd enlargement factor is greater than said first enlargement factor.
9. according to each described source current testing circuit of claim 1-4; It is characterized in that; Said target reference signal comprises reference signal and earth signal, and said reference signal voltage sampled value comprises said reference signal voltage sample value and earth signal voltage sample value;
Said control circuit specifically is used for according to formula (M
v-M
GND)/V=(M
IREF-M
GND)/V
IREF, calculate said voltage of signals value to be detected;
Wherein, M
vBe said signal voltage sampled value to be detected;
M
IREFBe said reference signal voltage sample value;
M
GNDBe said earth signal voltage sample value;
V
IREFMagnitude of voltage for said target reference signal;
V is said voltage of signals value to be detected.
10. a source current detection method is characterized in that, comprising:
Amplifying circuit under the control of the control circuit of the testing circuit in the source current testing circuit in said source current testing circuit in said source current testing circuit is imported target reference signal and signal to be detected respectively; Said target reference signal is used to be calculated said voltage of signals value to be detected reference data is provided, and said signal to be detected is the signal that the shunt that is connected with power supply to be detected is exported;
Said amplifying circuit carries out processing and amplifying to said target reference signal and said signal to be detected respectively under the control of said control circuit, and the target reference signal after will amplifying and signal to be detected offer the code value sample circuit in the said source current testing circuit respectively;
Said code value sample circuit is sampled to the signal to be detected after target reference signal after the said amplification and the said amplification respectively; Obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and said reference signal voltage sampled value and said signal voltage sampled value to be detected are offered said control circuit;
Said control circuit calculates said voltage of signals value to be detected according to the magnitude of voltage of said reference signal voltage sampled value, said signal voltage sampled value to be detected and said target reference signal.
11. source current detection method according to claim 10; It is characterized in that; Said amplifying circuit carries out processing and amplifying to said target reference signal and said signal to be detected respectively under the control of said control circuit, and the code value sample circuit that the target reference signal after will amplifying and signal to be detected offer respectively in the said source current testing circuit comprises:
Appearance in the said amplifying circuit carries out preposition processing and amplifying with amplifying circuit respectively to said target reference signal and said signal to be detected, and the signal to be detected after target reference signal after the preposition amplification and the preposition amplification is offered the multiple amplifying circuit in the said amplifying circuit respectively;
Said multiple amplifying circuit is carrying out the multiple processing and amplifying to the signal to be detected after target reference signal after the said preposition amplification and the said preposition amplification respectively under the control of said control circuit, and target reference signal and the signal to be detected after the multiple amplification offered said code value sample circuit respectively.
12. source current detection method according to claim 11 is characterized in that, said target reference signal is one group of reference signal in many groups reference signal of said testing circuit;
Target reference signal imported respectively by amplifying circuit under the control of the control circuit of the testing circuit in the said source current testing circuit in said source current testing circuit in said source current testing circuit and signal to be detected comprises:
Said control circuit is controlled a way switch conducting that is connected with said target reference signal in first multiway analog switch of said testing circuit, and said testing circuit is imported said target reference signal to said appearance with amplifying circuit through a way switch that is switched on;
Said control circuit is controlled a way switch conducting that is connected with said signal to be detected in said first multiway analog switch, and said testing circuit is imported said to be detected signal to said appearance with amplifying circuit through a way switch that is switched on.
13. source current detection method according to claim 12; It is characterized in that said multiple amplifying circuit comprises respectively the signal to be detected after target reference signal after the said preposition amplification and the said preposition amplification being carried out processing and amplifying under the control of said control circuit:
Said control circuit is controlled a way switch conducting of second multiway analog switch of said multiple amplifying circuit; Said multiple amplifying circuit carries out the multiple processing and amplifying to the signal to be detected after target reference signal after the said preposition amplification and the said preposition amplification respectively, the enlargement factor of said multiple processing and amplifying for said second multiway analog switch in the enlargement factor of the amplification channel that is connected of the way switch that is switched on.
14. source current detection method according to claim 13; It is characterized in that; Said many group reference signals comprise first group of reference signal and second group of reference signal, and the magnitude of voltage of said first group of reference signal is less than the magnitude of voltage of said second group of reference signal;
Said control circuit comprises before controlling a way switch conducting that is connected with said target reference signal in first multiway analog switch of said testing circuit:
Voltage of signals estimated value said to be detected and predeterminated voltage thresholding that said control circuit will obtain in advance compare; When said voltage of signals estimated value to be detected during more than or equal to said predeterminated voltage thresholding; Select said second group of reference signal as said target reference signal; When said voltage of signals estimated value to be detected during, select said first group of reference signal as said target reference signal less than said predeterminated voltage thresholding.
15. source current detection method according to claim 14 is characterized in that, the way switch conducting that said control circuit is controlled second multiway analog switch of said multiple amplifying circuit comprises:
Said control circuit with said voltage of signals estimated value to be detected respectively with said first group of reference signal in magnitude of voltage and the magnitude of voltage of said second group of reference signal compare; Confirm the target enlargement factor according to comparative result, controlling in said second multiway analog switch with enlargement factor then is the way switch conducting that the amplification channel of said target enlargement factor is connected.
16. source current detection method according to claim 15 is characterized in that, said control circuit confirms that according to comparative result the target enlargement factor comprises:
Said control circuit is in said voltage of signals estimated value to be detected during greater than the magnitude of voltage of said second group of reference signal; Confirm that said target enlargement factor is first enlargement factor; In said voltage of signals estimated value to be detected during less than the magnitude of voltage of said first group of reference signal; Confirm that said target enlargement factor is second enlargement factor; During less than the magnitude of voltage of said second group of reference signal, confirm that said target enlargement factor is the 3rd enlargement factor greater than the magnitude of voltage of said first group of reference signal in said voltage of signals estimated value to be detected; Wherein, said second enlargement factor is greater than said the 3rd enlargement factor, and said the 3rd enlargement factor is greater than said first enlargement factor.
17. according to each described source current detection method of claim 10-16; It is characterized in that; Said target reference signal comprises reference signal and earth signal, and said reference signal voltage sampled value comprises said reference signal voltage sample value and earth signal voltage sample value;
Said control circuit calculates said voltage of signals value to be detected according to the magnitude of voltage of said reference signal voltage sampled value, said signal voltage sampled value to be detected and said target reference signal and comprises:
Said control circuit is according to formula (M
v-M
GND)/V=(M
IREF-M
GND)/V
IREF, calculate said voltage of signals value to be detected;
Wherein, M
vBe said signal voltage sampled value to be detected;
M
IREFBe said reference signal voltage sample value;
M
GNDBe said earth signal voltage sample value;
V
IREFMagnitude of voltage for said target reference signal;
V is said voltage of signals value to be detected.
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