CN102680910B - 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 power detecting technology, particularly relate to a kind of source current detection method and circuit.
Background technology
Source current detects an emphasis of the electric current being always the various power supply of detection (such as accumulator), is also a difficult point.At present to the detection of source current mainly by shunt (being actually a very little resistance value, for detecting DC current) serial connection in circuit, the detection that the mode of difference realizes source current is then adopted.Fig. 1 is the circuit diagram detecting source current at present.As shown in Figure 1, shunt 11 and power supply 12 are serially connected, a both sides operational amplifier (abbreviation amplifier) 13 in parallel of shunt 11.
For the application scenarios of the big current such as current power supply 1000A, 10000A, need the shunt selecting to support larger current (namely specification is larger), electric current comparatively conference causes shunt thermal value very large, causes metrical error comparatively large, cannot meet the demand of accuracy of detection.
Summary of the invention
The invention provides a kind of source current detection method and circuit, in order to improve the precision detected source current.
The embodiment of the present invention provides a kind of source current testing circuit, comprising: testing circuit, amplifying circuit, code value sample circuit and control circuit; Described testing circuit, described amplifying circuit are connected successively with described code value sample circuit, and described control circuit is connected with described testing circuit, described amplifying circuit and described code value sample circuit respectively;
Described testing circuit, for inputting target reference signal and signal to be detected respectively to described amplifying circuit under the control of described control circuit, described target reference signal is used for providing reference data for the magnitude of voltage calculating upper described signal to be detected, and described signal to be detected is the signal that the shunt be connected with power supply to be detected exports;
Described amplifying circuit, for carrying out amplification process to described target reference signal and described signal to be detected respectively under the control of described control circuit, and is supplied to described code value sample circuit respectively by the target reference signal after amplification and signal to be detected;
Described code value sample circuit, for sampling to the signal to be detected after the target reference signal after described amplification and described amplification respectively, obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and described reference signal voltage sampled value and described signal voltage sampled value to be detected are supplied to described control circuit;
Described control circuit, described target reference signal and described signal to be detected is inputted respectively to described amplifying circuit for controlling described testing circuit, control described amplifying circuit and respectively amplification process is carried out to described target reference signal and described signal to be detected, and calculate the magnitude of voltage of described signal to be detected according to the magnitude of voltage of described reference signal voltage sampled value, described signal voltage sampled value to be detected and described target reference signal.
The embodiment of the present invention provides a kind of source current detection method, comprising:
Target reference signal and signal to be detected is inputted respectively to the amplifying circuit in described source current testing circuit under the control of the control circuit of the testing circuit in source current testing circuit in described source current testing circuit; Described target reference signal is used for providing reference data for the magnitude of voltage calculating described signal to be detected, and described signal to be detected is the signal that the shunt be connected with power supply to be detected exports;
Described amplifying circuit carries out amplification process to described target reference signal and described signal to be detected respectively under the control of described control circuit, and the target reference signal after amplification and signal to be detected is supplied to respectively the code value sample circuit in described source current testing circuit;
Described code value sample circuit is sampled to the signal to be detected after the target reference signal after described amplification and described amplification respectively, obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and described reference signal voltage sampled value and described signal voltage sampled value to be detected are supplied to described control circuit;
Described control circuit calculates the magnitude of voltage of described signal to be detected according to the magnitude of voltage of described reference signal voltage sampled value, described signal voltage sampled value to be detected and described target reference signal.
The source current detection method that the embodiment of the present invention provides and circuit, control circuit controls testing circuit respectively to amplifying circuit input target reference signal and signal to be detected, amplifying circuit is supplied to code value sample circuit after amplifying target reference signal and signal to be detected respectively, and sampled by the voltage of code value sample circuit to the target reference signal after amplification and signal to be detected, voltage sample value is supplied to control circuit, control circuit is according to the voltage sample value of target reference signal, the voltage sample value of signal to be detected and the magnitude of voltage of target reference signal calculate the voltage of signal to be detected, owing to taking target reference signal as the method that benchmark have employed relative measurement, improve measuring accuracy.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained 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 making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
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 the 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 are connected successively with code value sample circuit 14, and control circuit 15 is connected with testing circuit 11, amplifying circuit 10 and code value sample circuit 14 respectively.
Testing circuit 11, for inputting target reference signal and signal to be detected respectively to amplifying circuit 10 under the control of control circuit 15.Wherein, target reference signal is used for providing reference data for the magnitude of voltage calculating signal to be detected, for the electric current adopting relative measurement to measure power supply to be detected lays the first stone.Signal to be detected is the signal that the shunt be connected with power supply to be detected exports.Concrete, the voltage of power supply to be detected carries out shunting through shunt and obtains signal to be detected.Wherein, described power supply to be detected can be accumulator, but is not limited thereto.
Amplifying circuit 10, for carrying out amplification process to target reference signal and signal to be detected respectively under the control of control circuit 15, and is supplied to code value sample circuit 14 respectively by the target reference signal after amplification and signal to be detected.
Code value sample circuit 14, for sampling to the target reference signal after amplification and the signal to be detected after amplifying respectively, obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and Reference Signal voltage sample value and signal voltage sampled value to be detected are supplied to control circuit 15.
Control circuit 15, target reference signal and signal to be detected is provided respectively to amplifying circuit 10 for controlling testing circuit 11, control amplifying circuit 10 and respectively amplification process is carried out to target reference signal and signal to be detected, and calculate the magnitude of voltage of signal to be detected according to the magnitude of voltage of reference signal voltage sampled value, signal voltage sampled value to be detected and target reference signal.
The source current testing circuit that the present embodiment provides, control circuit controls testing circuit respectively to amplifying circuit input target reference signal and signal to be detected, amplifying circuit is supplied to code value sample circuit after amplifying target reference signal and signal to be detected respectively, then sampled by the voltage of code value sample circuit to the target reference signal after amplification and signal to be detected, voltage sample value is supplied to control circuit, control circuit is according to the voltage sample value of target reference signal, the voltage sample value of signal to be detected and the magnitude of voltage of target reference signal calculate the voltage of signal to be detected, achieving with target reference signal is the method that benchmark treats that detection signal carries out relative measurement, improve measuring accuracy.In addition, the source current testing circuit that the present embodiment provides adopts relative measurement to improve measuring accuracy, lower to the accuracy requirement of the amplifying circuit used, the device allowing use cost relatively low realizes, such as operational amplifiers etc., therefore, also have and realize lower-cost advantage.
The structural representation of the source current testing circuit that Figure 1B provides for another embodiment of the present invention.The present embodiment can realize based on Figure 1A illustrated embodiment.As shown in Figure 1B, the difference of circuit shown in the source current testing circuit of the present embodiment and Figure 1A is: the amplifying circuit 10 of the present embodiment comprises two parts, is instrument amplifying circuit 12 and multiple amplifying circuit 13 respectively.That is, the circuit of the present embodiment comprises: testing circuit 11, instrument amplifying circuit 12, multiple amplifying circuit 13, code value sample circuit 14 and control circuit 15.Wherein, testing circuit 11, instrument amplifying circuit 12, multiple amplifying circuit 13 are connected successively with code value sample circuit 14, 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, for inputting target reference signal and signal to be detected respectively to instrument amplifying circuit 12 under the control of control circuit 15.Wherein, testing circuit 11 can provide and organize reference signal more, 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 that the shunt be connected with power supply to be detected exports.
Concrete, testing circuit 11 can be connected with shunt, for obtaining signal to be detected from shunt.
Instrument amplifying circuit 12, for carrying out enlarge leadingly process (or perhaps the first order amplifies process) respectively to target reference signal and signal to be detected, and the signal to be detected after the target reference signal after enlarge leadingly and enlarge leadingly is supplied to multiple amplifying circuit 13 respectively.
Optionally, instrument amplifying circuit 12 can be built by the device such as operational amplifier and resistance.
Optionally, instrument amplifying circuit 12 can also use existing instrument amplification chip to realize.
Wherein, instrument amplifying circuit 12 be suitable for causing the tiny signal in environment to amplify, therefore in the source current testing circuit of the present embodiment using instrument with amplifying circuit 12 as pre-amplification circuit, be conducive to improving the amplification precision to target reference signal and signal to be detected.
Multiple amplifying circuit 13, amplify process (or perhaps process is amplified in the second level) for carrying out multiple to the signal to be detected after the target reference signal after enlarge leadingly and enlarge leadingly respectively under the control of control circuit 15, and the signal to be detected after the target reference signal after multiple amplification and multiple being amplified is supplied to code value sample circuit 14 respectively.Multiple amplifying circuit 13 is on the basis of instrument amplifying circuit 12, amplifies further to target reference signal and signal to be detected.
Optionally, multiple amplifying circuit 13 can be built by devices such as multiple operational amplifier, resistance.
Code value sample circuit 14, sample for the signal to be detected after amplifying the target reference signal after multiple amplification and multiple respectively, obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and Reference Signal voltage sample value and signal voltage sampled value to be detected are supplied to control circuit 15.
Optionally, code value sample circuit 14 can be AD sample circuit.
Control circuit 15, target reference signal and signal to be detected is inputted respectively to instrument amplifying circuit 12 for controlling testing circuit 11, control multiple amplifying circuit 13 and respectively multiple amplification process is carried out to the signal to be detected after the target reference signal after enlarge leadingly and enlarge leadingly, and calculate the magnitude of voltage of signal to be detected according to the magnitude of voltage of reference signal voltage sampled value, signal voltage sampled value to be detected and target reference signal.
Wherein, the control circuit 15 of the present embodiment can by software simulating, such as, can be CPU (central processing unit) (Central Processing Unit, CPU), also can by hardware implementing.
The source current testing circuit that the present embodiment provides, control circuit controls testing circuit respectively to instrument amplifying circuit input target reference signal and signal to be detected, instrument amplifying circuit is supplied to multiple amplifying circuit after carrying out enlarge leadingly to target reference signal and signal to be detected respectively, control circuit control multiple amplifying circuit does target reference signal and signal to be detected respectively and amplifies process further, and sampled by the voltage of code value sample circuit to the target reference signal after further amplification and signal to be detected, voltage sample value is supplied to control circuit, control circuit is according to the voltage sample value of target reference signal, the voltage sample value of signal to be detected and the magnitude of voltage of target reference signal calculate the voltage of signal to be detected, achieving with target reference signal is the method that benchmark treats that detection signal carries out relative measurement, improve measuring accuracy.In addition, the source current testing circuit that the present embodiment provides adopts relative measurement to improve measuring accuracy, lower to the accuracy requirement of the instrument amplifying circuit used and multiple amplifying circuit, the device allowing use cost relatively low realizes, such as operational amplifier etc., therefore, also have and realize lower-cost advantage.
The structural representation of the source current testing circuit that Fig. 2 provides for further embodiment of this invention.The present embodiment can realize based on Figure 1B illustrated embodiment.As shown in Figure 2, the testing circuit 11 of the present embodiment can comprise the first multiway analog switch 111.Wherein, often group reference signal and the signal to be detected of testing circuit 11 are connected with a way switch of the first multiway analog switch 111 respectively, and the output terminal of the first multiway analog switch 111 is connected with instrument amplifying circuit 12.
Based on this, control circuit 15 specifically can be used for the way switch conducting be connected with target reference signal in control first multiway analog switch 111, to control testing circuit 11 to input object from target reference signal to instrument amplifying circuit 12.
Control circuit 15 also specifically for controlling the way switch conducting be connected with signal to be detected in the first multiway analog switch 111, inputs signal to be detected to control testing circuit 11 to instrument amplifying circuit 12.
In this explanation, control circuit 15 once can only control the way switch conducting in the first multiway analog switch 111, namely once can only control testing circuit 11 and provide a kind of signal to instrument amplifying circuit 12, this signal or target reference signal or signal to be detected.
Further, the testing circuit 11 of the present embodiment also comprises: input switch 112.This input switch 112 connects with the way switch be connected with signal to be detected in shunt and the first multiway analog switch 111 respectively.Wherein, shunt and power sources in series to be detected, for shunting power supply to be detected.The testing circuit 11 of the present embodiment obtains signal to be detected by its input switch 112 from shunt, and signal to be detected is flowed to the first multiway analog switch 111.
In addition, as shown in Figure 2, the testing circuit 11 of the present embodiment also comprises some auxiliary circuits be made up of resistance or diode, no longer illustrates at this these auxiliary circuits.
The testing circuit 11 of the present embodiment adopts input switch to be connected with shunt, instead of adopt fixed form to be connected with shunt, be conducive to detecting difference power supply to be detected, making it possible to by using a source current testing circuit to detect multiple power supply to be detected, being conducive to as a whole saving testing cost.
As shown in Figure 2, the instrument amplifying circuit 12 of the present embodiment builds primarily of three operational amplifiers and six resistance, but is not limited thereto.The code value sample circuit 14 of the present embodiment is an AD sample circuit.
Further, the multiple amplifying circuit 13 of the present embodiment comprises multiple amplification channel 131 and the second multiway analog switch 132.Wherein, each amplification channel 131 is connected with a way switch of the second multiway analog switch 132, and the output terminal of the second multiway analog switch 132 is connected with code value sample circuit 14.Wherein, in multiple amplification channel 131, the enlargement factor of each amplification channel 131 is different.As shown in Figure 2, the enlargement factor of an amplification channel 131 is 1, the road be namely directly connected with the second multiway analog switch 132; The enlargement factor of other amplification channels 131 is all greater than 1, forms primarily of operational amplifier, and the number of the operational amplifier used according to the difference of enlargement factor is different.For ease of diagram, the multiple amplifying circuit 13 provided in Fig. 2 comprises three amplification channels 131.
Based on above-mentioned, control circuit 15 specifically can be used for a way switch conducting of control second multiway analog switch 132, carries out multiple amplification process respectively to control multiple amplifying circuit 13 to the signal to be detected after the target reference signal after enlarge leadingly and enlarge leadingly.Described multiple amplifies the enlargement factor that the enlargement factor processed is the amplification channel be connected with a way switch switched in the second multiway analog switch 132.That is, control circuit 15 is by certain way switch conducting in control second multiway analog switch 132, and the amplification channel that multiple amplifying circuit 13 is connected by switch switched on this carries out multiple to the signal to be detected after the target reference signal after enlarge leadingly and enlarge leadingly and amplifies and process.Wherein, the enlargement factor of multiple amplifying circuit is the enlargement factor of carrying out the amplification channel amplifying process.
Optionally, many groups reference signal of testing circuit 11 can be two groups of reference signals, is respectively first group of reference signal (IREF1, AGND1) and second group of reference signal (IREF2, and the magnitude of voltage of first group of reference signal is less than the magnitude of voltage of second group of reference signal AGND2).Then control circuit 15 specifically can be used for the voltage estimated value of the signal to be detected obtained in advance and predeterminated voltage thresholding to compare, when the voltage estimated value of signal to be detected is more than or equal to predeterminated voltage thresholding, select second group of reference signal as target reference signal, when the voltage estimated value of signal to be detected is less than predeterminated voltage thresholding, select first group of reference signal as target reference signal; Then control the way switch conducting be connected with target reference signal in the first multiway analog switch 111, input target reference signal to control testing circuit 11 to instrument amplifying circuit 12.Wherein, the voltage estimated value of signal to be detected is that the magnitude of voltage treating detection signal in advance carries out estimating to obtain.
Based on above-mentioned, control circuit 15 specifically can be used for the voltage estimated value of signal to be detected to compare with the magnitude of voltage of the magnitude of voltage in first group of reference signal and second group of reference signal respectively, according to comparative result determination object magnification, then controlling is the way switch conducting that the amplification channel 131 of the object magnification determined is connected with enlargement factor in the second multiway analog switch 132, respectively the multiple amplification process that enlargement factor is determined object magnification is carried out to the signal to be detected after the target reference signal after enlarge leadingly and enlarge leadingly to control multiple amplifying circuit 13.
Further, when the voltage estimated value that control circuit 15 is specifically used in signal to be detected is greater than the magnitude of voltage of second group of reference signal, determine that object magnification is the first enlargement factor, when the voltage estimated value of signal to be detected is less than the magnitude of voltage of first group of reference signal, determine that object magnification is the second enlargement factor, when the voltage estimated value of signal to be detected is greater than the magnitude of voltage of first group of reference signal and is less than the magnitude of voltage of second group of reference signal, determine that object magnification is the 3rd enlargement factor; Wherein, the second enlargement factor is greater than the 3rd enlargement factor, and the 3rd enlargement factor is greater than the first enlargement factor.
Comprise the structure of three amplification channels 131 shown in composition graphs 2, be followed successively by first via amplification channel 131, second road amplification channel 131 and the 3rd road amplification channel 131 from top to bottom.Correspondingly, the enlargement factor of the corresponding first via amplification channel 131 of the first enlargement factor can be 1; The enlargement factor of the corresponding second road amplification channel 131 of the 3rd enlargement factor; The enlargement factor of the corresponding 3rd road amplification channel 131 of the second enlargement factor.
Further, often organize reference signal in the present embodiment and comprise reference signal and earth signal.Accordingly, the target reference signal that the present embodiment uses also comprises reference signal and earth signal; Correspondingly, reference signal voltage sampled value comprises reference signal voltage sampled value and earth signal voltage sample value.Wherein, the earth signal in reference signal is mainly used in the common-mode signal of amplifier in instrument amplifying circuit 12 to be removed by additional earth signal, can improve accuracy of detection further.
Based on above-mentioned, control circuit 15 specifically can calculate the magnitude of voltage of signal to be detected according to formula (1).
（M
v-M
GND)/V=（M
IREF-M
GND)/V
IREF（1）
Wherein, M
vfor signal voltage sampled value to be detected; M
iREFfor reference signal voltage sampled value; M
gNDfor earth signal voltage sample value; V
iREFfor the magnitude of voltage of target reference signal; V is the magnitude of voltage of signal to be detected.
Illustrate at this, wherein the magnitude of voltage of target reference signal is actually the magnitude of voltage of the reference signal in target reference signal, and the magnitude of voltage of other reference signals is in fact also the magnitude of voltage of reference signal wherein.
In this explanation, checking draws by experiment: under the shunt specification of 25mv/500A, and under first group of reference signal providing of outside and second group of more stable prerequisite of reference signal, the accuracy of detection of the source current testing circuit of the present embodiment can reach 0.5%.
From above-mentioned, the source current testing circuit of the present embodiment, the detection of multichannel electric current can be completed by input switch, the selection organizing reference signal (comprising reference signal and earth signal) can be completed by the first multiway analog switch more, it can be the different target reference signal of different signal behavior to be detected, multiple amplifying circuit simultaneously by comprising multichannel amplification channel can when difference signal to be detected, select different enlargement factors, then sampled by code value sample circuit settling signal, and finally adopt formula (1) to complete the relative measurement treating detection signal by control circuit, drastically increase measuring accuracy, reduce measurement cost.
Further illustrate, in order to improve accuracy of detection further, need the accuracy ensureing reference signal, the source current testing circuit of the present embodiment can also correct reference signal for this reason.Concrete trimming process is: using the reference signal (reference signal referred to as to be corrected) in reference signal to be corrected as signal to be detected, use the size of outside input known and the known signal that precision is very high as target reference signal, control circuit 15 controls testing circuit 11 and respectively known signal and reference signal to be corrected is supplied to instrument amplifying circuit 12, instrument amplifying circuit 12 carries out enlarge leadingly to known signal and reference signal to be corrected respectively, then respectively the known signal after enlarge leadingly and reference signal to be corrected are supplied to multiple amplifying circuit 13.Control circuit 15 is according to the magnitude relationship determination object magnification of the voltage estimated value of reference signal to be corrected and the voltage of known signal, and the corresponding amplification channel 131 controlled in multiple amplifying circuit 13 carries out to the known signal after enlarge leadingly and reference signal to be corrected the multiple amplification process that enlargement factor is the object magnification determined respectively, then the known signal after being amplified by multiple respectively and reference signal to be corrected are supplied to 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 supplied to control circuit 15, the last accurate voltage values being calculated reference signal to be corrected by control circuit 15 according to formula (1), ensure that the accuracy of reference signal, for the follow-up check processing carrying out signal to be detected based on reference signal lays the foundation, be conducive to improving accuracy of detection.
To be described in detail the principle of work of the source current testing circuit that the embodiment of the present invention provides below by 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 the present embodiment comprises:
Target reference signal and signal to be detected is inputted respectively to the amplifying circuit in source current testing circuit under the control of the control circuit of testing circuit in source current testing circuit in step 301, source current testing circuit.
Wherein, target reference signal is used for providing reference data for the magnitude of voltage calculating signal to be detected, and signal to be detected is the signal that the shunt be connected with power supply to be detected exports.
The source current testing circuit of the present embodiment comprises testing circuit, amplifying circuit, code value sample circuit and control circuit, and its concrete structure can see shown in Figure 1A.
Step 302, amplifying circuit carry out amplification process to target reference signal and signal to be detected respectively under the control of control circuit, and the target reference signal after amplification and signal to be detected are supplied to respectively the code value sample circuit in source current testing circuit.
Step 303, code value sample circuit are sampled to the target reference signal after amplification and the signal to be detected after amplifying respectively, obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and Reference Signal voltage sample value and signal voltage sampled value to be detected are supplied to control circuit.
Step 304, control circuit calculate the magnitude of voltage of signal to be detected according to the magnitude of voltage of reference signal voltage sampled value, signal voltage sampled value to be detected and target reference signal.
In the present embodiment, control circuit controls testing circuit respectively to amplifying circuit input target reference signal and signal to be detected, amplifying circuit is supplied to code value sample circuit after amplifying target reference signal and signal to be detected respectively, and sampled by the voltage of code value sample circuit to the target reference signal after amplification and signal to be detected, voltage sample value is supplied to control circuit, control circuit is according to the voltage sample value of target reference signal, the voltage sample value of signal to be detected and the magnitude of voltage of target reference signal calculate the voltage of signal to be detected, owing to taking target reference signal as the method that benchmark have employed relative measurement, improve 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 the present embodiment comprises:
Target reference signal and signal to be detected is inputted respectively to the amplifying circuit in source current testing circuit under the control of the control circuit of testing circuit in source current testing circuit in step 401, source current testing circuit.
In the present embodiment, testing circuit comprises organizes reference signal more, and target reference signal is one group of reference signal in many groups reference signal of testing circuit, provides reference data equally for the magnitude of voltage for calculating signal to be detected.
In the present embodiment, amplifying circuit comprises instrument amplifying circuit and multiple amplifying circuit; Testing circuit comprises the first multiway analog switch.Reference signal of often organizing in testing circuit is connected with a way switch of the first multiway analog switch respectively with signal to be detected, and the output terminal of the first multiway analog switch is connected with instrument amplifying circuit.
Based on above-mentioned, the embodiment of step 401 can be: control circuit controls the way switch conducting be connected with target reference signal in the first multiway analog switch of testing circuit; Correspondingly, testing circuit inputs target reference signal by a way switch switched on to instrument amplifying circuit.Control circuit controls the way switch conducting be connected with signal to be detected in the first multiway analog switch; Correspondingly, testing circuit inputs signal to be detected by a way switch switched on to instrument amplifying circuit.
Further, testing circuit can also comprise: input switch, and described input switch connects with the way switch be connected with signal to be detected in shunt and the first multiway analog switch respectively, for signal to be detected is supplied to the first multichannel module switch.
Optionally, many group reference signals 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.
Then control circuit comprises before controlling the way switch conducting be connected with target reference signal in the first multiway analog switch of testing circuit: the voltage estimated value of signal to be detected and predeterminated voltage thresholding compare by control circuit, when the voltage estimated value of signal to be detected is more than or equal to predeterminated voltage thresholding, select second group of reference signal as target reference signal, when the voltage estimated value of signal to be detected is less than predeterminated voltage thresholding, select first group of reference signal as target reference signal.
Instrument amplifying circuit in step 402, amplifying circuit carries out enlarge leadingly process respectively to target reference signal and signal to be detected, and the signal to be detected after the target reference signal after enlarge leadingly and enlarge leadingly is supplied to the multiple amplifying circuit in amplifying circuit respectively.
Step 403, multiple amplifying circuit carry out multiple to the signal to be detected after the target reference signal after enlarge leadingly and enlarge leadingly respectively and amplify process under the control of control circuit, and the target reference signal after multiple amplification and signal to be detected are supplied to code value sample circuit respectively.
In the present embodiment, multiple amplifying circuit comprises multiple amplification channel and the second multiway analog switch.Each amplification channel is connected with a way switch of the second multiway analog switch, and the output terminal of the second multiway analog switch is connected with code value sample circuit.Wherein, in multiple amplification channel, the enlargement factor of each amplification channel is different.
Based on above-mentioned, multiple amplifying circuit carries out multiple amplification process to the signal to be detected after the target reference signal after enlarge leadingly and enlarge leadingly respectively and is specially under the control of control circuit: control circuit controls a way switch conducting of the second multiway analog switch of multiple amplifying circuit; Correspondingly, multiple amplifying circuit carries out multiple to the signal to be detected after the target reference signal after enlarge leadingly and enlarge leadingly respectively and amplifies process, and described multiple amplifies the enlargement factor that the enlargement factor processed is the amplification channel be connected with a way switch switched in the second multiway analog switch.
Optionally, if many group reference signals comprise first group of reference signal and second group of reference signal, then a way switch conducting of the second multiway analog switch of control circuit control multiple amplifying circuit specifically can comprise: the voltage estimated value of the signal to be detected obtained in advance compares, according to comparative result determination object magnification with the magnitude of voltage of the magnitude of voltage in first group of reference signal and second group of reference signal by control circuit respectively; Then controlling is the way switch conducting that the amplification channel of object magnification is connected with enlargement factor in the second multiway analog switch.
Further, control circuit can comprise according to comparative result determination object magnification: control circuit is when the voltage estimated value of signal to be detected is greater than the magnitude of voltage of second group of reference signal, determine that object magnification is the first enlargement factor, when the voltage estimated value of signal to be detected is less than the magnitude of voltage of first group of reference signal, determine that object magnification is the second enlargement factor, when the voltage estimated value of signal to be detected is greater than the magnitude of voltage of first group of reference signal and is less than the magnitude of voltage of second group of reference signal, determine that object magnification is the 3rd enlargement factor.Wherein, the second enlargement factor is greater than the 3rd enlargement factor, and the 3rd enlargement factor is greater than the 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 sample value and signal voltage sampled value to be detected are supplied to control circuit.
Step 405, control circuit calculate the magnitude of voltage of signal to be detected according to the magnitude of voltage of reference signal voltage sampled value, signal voltage sampled value to be detected and target reference signal.
Optionally, each reference signal comprises reference signal and earth signal.Accordingly, the target reference signal of the present embodiment also comprises reference signal and earth signal, then reference signal voltage sampled value comprises reference signal voltage sampled value and earth signal voltage sample value.
Then control circuit can calculate the magnitude of voltage of signal to be detected according to formula (1).About the relevant description of formula (1), can see the description of above-described embodiment.
In the present embodiment, control circuit controls testing circuit respectively to instrument amplifying circuit input target reference signal and signal to be detected, instrument amplifying circuit is supplied to multiple amplifying circuit after carrying out enlarge leadingly to target reference signal and signal to be detected respectively, control circuit control multiple amplifying circuit does target reference signal and signal to be detected respectively and amplifies process further, and sampled by the voltage of code value sample circuit to the target reference signal after further amplification and signal to be detected, voltage sample value is supplied to control circuit, control circuit is according to the voltage sample value of target reference signal, the voltage sample value of signal to be detected and the magnitude of voltage of target reference signal calculate the voltage of signal to be detected, achieving with target reference signal is the method that benchmark treats that detection signal carries out relative measurement, improve measuring accuracy.In addition, the source current testing circuit that the present embodiment provides adopts relative measurement to improve measuring accuracy, lower to the accuracy requirement of the instrument amplifying circuit used and multiple amplifying circuit, the device allowing use cost relatively low realizes, such as operational amplifier etc., therefore, also have and realize lower-cost advantage.
Illustrate at this, in above-mentioned each embodiment of the method, source current testing circuit is independently to target reference signal and the processing procedure for the treatment of detection signal, is not carry out simultaneously.Such as, source current testing circuit first can process target reference signal and obtain reference signal voltage sampled value corresponding to target reference signal; Then, source current testing circuit is treated detection signal again and is carried out processing and obtain signal voltage sampled value to be detected, finally calculates the voltage of signal to be detected again according to formula (1).Again such as, source current testing circuit first can be treated detection signal and carries out processing and obtain signal voltage sampled value to be detected; Then, source current testing circuit processes target reference signal and obtains reference signal voltage sampled value corresponding to target reference signal, finally calculates the voltage of signal to be detected again according to formula (1).
Below in conjunction with the structure of the testing circuit of source current shown in Fig. 2, first target reference signal is processed with source current testing circuit, and then treat the detailed implementation process that detection signal carries out being treated to example explanation said method.This implementation process as shown in Figure 5, specifically comprises:
The voltage estimated value of the signal to be detected obtained in advance and predeterminated voltage thresholding compare by step 501, control circuit, when the voltage estimated value of signal to be detected is more than or equal to predeterminated voltage thresholding, select second group of reference signal as target reference signal, when the voltage estimated value of signal to be detected is less than predeterminated voltage thresholding, select first group of reference signal as target reference signal.
This step 501 is an optional step.Wherein, the voltage estimated value of signal to be detected is that the magnitude of voltage treating detection signal in advance carries out estimating to obtain.
Step 502, control circuit control the way switch conducting be connected with target reference signal in the first multiway analog switch of testing circuit; Testing circuit inputs target reference signal by a way switch switched on to instrument amplifying circuit.
Step 503, instrument amplifying circuit carry out enlarge leadingly process to target reference signal, and the target reference signal after enlarge leadingly is supplied to multiple amplifying circuit.
Step 504, control circuit control a way switch conducting of the second multiway analog switch of multiple amplifying circuit; Multiple amplifying circuit carries out multiple by the amplification channel that is connected with a switched on way switch to the target reference signal after enlarge leadingly and amplifies and process, and the target reference signal after multiple amplification is supplied to code value sample circuit.
Optionally, if many group reference signals comprise first group of reference signal and second group of reference signal, then a way switch conducting of the second multiway analog switch of control circuit control multiple amplifying circuit specifically can comprise: the voltage estimated value of signal to be detected compares with the magnitude of voltage of the magnitude of voltage in first group of reference signal and second group of reference signal by control circuit respectively, according to comparative result determination object magnification, then controlling is the way switch conducting that the amplification channel of object magnification is connected with enlargement factor in the second multiway analog switch.
Step 505, code value sample circuit are sampled to the target reference signal after multiple amplifies, and obtain reference signal voltage sampled value Reference Signal voltage sample value is supplied to control circuit.
Step 506, control circuit control the way switch conducting be connected with signal to be detected in the first multiway analog switch; Testing circuit inputs signal to be detected by a way switch switched on to instrument amplifying circuit.
Step 507, instrument amplifying circuit are treated detection signal and are carried out enlarge leadingly process, and the signal to be detected after enlarge leadingly is supplied to multiple amplifying circuit.
Step 508, control circuit control a way switch conducting of the second multiway analog switch of multiple amplifying circuit; Multiple amplifying circuit carries out multiple by the amplification channel that is connected with a switched on way switch to the signal to be detected after enlarge leadingly and amplifies and process, and the signal to be detected after multiple amplification is supplied to code value sample circuit.
Step 509, code value sample circuit are sampled to the signal to be detected after multiple amplification, obtain signal voltage sampled value to be detected and signal voltage sampled value to be detected is supplied to control circuit.
Step 510, control circuit calculate the magnitude of voltage of signal to be detected according to the magnitude of voltage of reference signal voltage sampled value, signal voltage sampled value to be detected and target reference signal.
Optionally, control circuit can calculate the magnitude of voltage of signal to be detected according to formula (1).
In the present embodiment, control circuit controls testing circuit respectively to instrument amplifying circuit input target reference signal and signal to be detected, instrument amplifying circuit is supplied to multiple amplifying circuit after carrying out enlarge leadingly to target reference signal and signal to be detected respectively, control circuit control multiple amplifying circuit does target reference signal and signal to be detected respectively and amplifies process further, and sampled by the voltage of code value sample circuit to the target reference signal after further amplification and signal to be detected, voltage sample value is supplied to control circuit, control circuit is according to the voltage sample value of target reference signal, the voltage sample value of signal to be detected and the magnitude of voltage of target reference signal calculate the voltage of signal to be detected, achieving with target reference signal is the method that benchmark treats that detection signal carries out relative measurement, improve measuring accuracy.In addition, the source current testing circuit that the present embodiment provides adopts relative measurement to improve measuring accuracy, lower to the accuracy requirement of the instrument amplifying circuit used and multiple amplifying circuit, the device allowing use cost relatively low realizes, such as operational amplifier etc., therefore, also have and realize lower-cost advantage.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that programmed instruction is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (15)
1. a source current testing circuit, is characterized in that, comprising: testing circuit, amplifying circuit, code value sample circuit and control circuit; Described testing circuit, described amplifying circuit are connected successively with described code value sample circuit, and described control circuit is connected with described testing circuit, described amplifying circuit and described code value sample circuit respectively;
Described testing circuit, for inputting target reference signal and signal to be detected respectively to described amplifying circuit under the control of described control circuit, described target reference signal is used for providing reference data for the magnitude of voltage calculating described signal to be detected, and described signal to be detected is the signal that the shunt be connected with power supply to be detected exports;
Described amplifying circuit, for carrying out amplification process to described target reference signal and described signal to be detected respectively under the control of described control circuit, and is supplied to described code value sample circuit respectively by the target reference signal after amplification and signal to be detected;
Described amplifying circuit comprises: instrument amplifying circuit and multiple amplifying circuit;
Described instrument amplifying circuit, for carrying out enlarge leadingly process respectively to described target reference signal and described signal to be detected, and is supplied to described multiple amplifying circuit respectively by the signal to be detected after the target reference signal after enlarge leadingly and enlarge leadingly;
Described multiple amplifying circuit, amplify process for carrying out multiple to the signal to be detected after the target reference signal after described enlarge leadingly and described enlarge leadingly respectively under the control of described control circuit, and the target reference signal after multiple amplification and signal to be detected are supplied to described code value sample circuit respectively;
Described code value sample circuit, for sampling to the signal to be detected after the target reference signal after described amplification and described amplification respectively, obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and described reference signal voltage sampled value and described signal voltage sampled value to be detected are supplied to described control circuit;
Described control circuit, described target reference signal and described signal to be detected is inputted respectively to described amplifying circuit for controlling described testing circuit, control described amplifying circuit and respectively amplification process is carried out to described target reference signal and described signal to be detected, and calculate the magnitude of voltage of described signal to be detected according to the magnitude of voltage of described reference signal voltage sampled value, described signal voltage sampled value to be detected and described target reference signal.
2. source current testing circuit according to claim 1, is characterized in that, described target reference signal is one group of reference signal in many groups reference signal of described testing circuit;
Described testing circuit comprises the first multiway analog switch, reference signal of often organizing in described testing circuit is connected with a way switch of described first multiway analog switch respectively with described signal to be detected, and the output terminal of described first multiway analog switch is connected with described instrument amplifying circuit;
Described control circuit is specifically for controlling the way switch conducting be connected with described target reference signal in described first multiway analog switch, described target reference signal is inputted to described instrument amplifying circuit to control described testing circuit, control the way switch conducting be connected with described signal to be detected in described first multiway analog switch, to control described testing circuit to the described signal to be detected of described instrument amplifying circuit input.
3. source current testing circuit according to claim 2, it is characterized in that, described testing circuit also comprises: input switch, described input switch is connected with described shunt, and described input switch also connects with the way switch be connected with described signal to be detected in described first multiway analog switch.
4. the source current testing circuit according to Claims 2 or 3, is characterized in that, described multiple amplifying circuit comprises multiple amplification channel and the second multiway analog switch; Each described amplification channel is connected with a way switch of described second multiway analog switch, and the output terminal of described second multiway analog switch is connected with described code value sample circuit, and in described multiple amplification channel, the enlargement factor of each amplification channel is different;
Described control circuit is specifically for controlling a way switch conducting of described second multiway analog switch, with control described multiple amplifying circuit respectively first time is amplified after target reference signal and first time amplify after signal to be detected carry out multiple and amplify process, the enlargement factor that described multiple amplifies process is the enlargement factor of the amplification channel be connected with a way switch switched in described second multiway analog switch.
5. source current testing circuit according to claim 4, is characterized in that, described many group reference signals comprise first group of reference signal and second group of reference signal, and the magnitude of voltage of described first group of reference signal is less than the magnitude of voltage of described second group of reference signal;
Described control circuit specifically for, the voltage estimated value of the signal described to be detected obtained in advance and predeterminated voltage thresholding are compared, when the voltage estimated value of described signal to be detected is more than or equal to described predeterminated voltage thresholding, select described second group of reference signal as described target reference signal, when the voltage estimated value of described signal to be detected is less than described predeterminated voltage thresholding, select described first group of reference signal as described target reference signal; Then control the way switch conducting be connected with described target reference signal in described first multiway analog switch, input described target reference signal to control described testing circuit to described instrument amplifying circuit.
6. source current testing circuit according to claim 5, it is characterized in that, described control circuit is specifically for comparing the voltage estimated value of described signal to be detected with the magnitude of voltage of the magnitude of voltage in described first group of reference signal and described second group of reference signal respectively, according to comparative result determination object magnification, then controlling is the way switch conducting that the amplification channel of described object magnification is connected with enlargement factor in described second multiway analog switch, respectively the multiple amplification process that enlargement factor is described object magnification is carried out to the signal to be detected after the target reference signal after described enlarge leadingly and described enlarge leadingly to control described multiple amplifying circuit.
7. source current testing circuit according to claim 6, it is characterized in that, described control circuit specifically for, when the voltage estimated value of described signal to be detected is greater than the magnitude of voltage of described second group of reference signal, determine that described object magnification is the first enlargement factor, when the voltage estimated value of described signal to be detected is less than the magnitude of voltage of described first group of reference signal, determine that described object magnification is the second enlargement factor, when the voltage estimated value of described signal to be detected is greater than the magnitude of voltage of described first group of reference signal and is less than the magnitude of voltage of described second group of reference signal, determine that described object magnification is the 3rd enlargement factor, wherein, described second enlargement factor is greater than described 3rd enlargement factor, and described 3rd enlargement factor is greater than described first enlargement factor.
8. the source current testing circuit according to any one of claim 1-3, it is characterized in that, described target reference signal comprises reference signal and earth signal, and described reference signal voltage sampled value comprises described reference signal voltage sampled value and earth signal voltage sample value;
Described control circuit is specifically for according to formula (M
v-M
gND)/V=(M
iREF-M
gND)/V
iREF, calculate the magnitude of voltage of described signal to be detected;
Wherein, M
vfor described signal voltage sampled value to be detected;
M
iREFfor described reference signal voltage sampled value;
M
gNDfor described earth signal voltage sample value;
V
iREFfor the magnitude of voltage of described target reference signal;
V is the magnitude of voltage of described signal to be detected.
9. a source current detection method, is characterized in that, comprising:
Target reference signal and signal to be detected is inputted respectively to the amplifying circuit in described source current testing circuit under the control of the control circuit of the testing circuit in source current testing circuit in described source current testing circuit; Described target reference signal is used for providing reference data for the magnitude of voltage calculating described signal to be detected, and described signal to be detected is the signal that the shunt be connected with power supply to be detected exports;
Described amplifying circuit carries out amplification process to described target reference signal and described signal to be detected respectively under the control of described control circuit, and the target reference signal after amplification and signal to be detected is supplied to respectively the code value sample circuit in described source current testing circuit;
Described code value sample circuit is sampled to the signal to be detected after the target reference signal after described amplification and described amplification respectively, obtain reference signal voltage sampled value and signal voltage sampled value to be detected, and described reference signal voltage sampled value and described signal voltage sampled value to be detected are supplied to described control circuit;
Described control circuit calculates the magnitude of voltage of described signal to be detected according to the magnitude of voltage of described reference signal voltage sampled value, described signal voltage sampled value to be detected and described target reference signal;
Wherein, described amplifying circuit carries out amplification process to described target reference signal and described signal to be detected respectively under the control of described control circuit, and is comprised by the code value sample circuit that the target reference signal after amplification and signal to be detected are supplied in described source current testing circuit respectively:
Instrument amplifying circuit in described amplifying circuit carries out enlarge leadingly process respectively to described target reference signal and described signal to be detected, and the signal to be detected after the target reference signal after enlarge leadingly and enlarge leadingly is supplied to the multiple amplifying circuit in described amplifying circuit respectively;
Described multiple amplifying circuit carries out multiple to the signal to be detected after the target reference signal after described enlarge leadingly and described enlarge leadingly respectively and amplifies process under the control of described control circuit, and the target reference signal after multiple amplification and signal to be detected are supplied to described code value sample circuit respectively.
10. source current detection method according to claim 9, is characterized in that, described target reference signal is one group of reference signal in many groups reference signal of described testing circuit;
Target reference signal is inputted respectively to the amplifying circuit in described source current testing circuit and signal to be detected comprises under the control of the control circuit of the testing circuit in described source current testing circuit in described source current testing circuit:
Described control circuit controls the way switch conducting be connected with described target reference signal in the first multiway analog switch of described testing circuit, and described testing circuit inputs described target reference signal by a way switch switched on to described instrument amplifying circuit;
Described control circuit controls the way switch conducting be connected with described signal to be detected in described first multiway analog switch, and described testing circuit inputs described signal to be detected by a way switch switched on to described instrument amplifying circuit.
11. source current detection methods according to claim 10, it is characterized in that, described multiple amplifying circuit carries out amplification process to the signal to be detected after the target reference signal after described enlarge leadingly and described enlarge leadingly respectively and comprises under the control of described control circuit:
Described control circuit controls a way switch conducting of the second multiway analog switch of described multiple amplifying circuit, described multiple amplifying circuit carries out multiple to the signal to be detected after the target reference signal after described enlarge leadingly and described enlarge leadingly respectively and amplifies process, and described multiple amplifies the enlargement factor that the enlargement factor processed is the amplification channel be connected with a way switch switched in described second multiway analog switch.
12. source current detection methods according to claim 11, it is characterized in that, described many group reference signals comprise first group of reference signal and second group of reference signal, and the magnitude of voltage of described first group of reference signal is less than the magnitude of voltage of described second group of reference signal;
Described control circuit comprises before controlling the way switch conducting be connected with described target reference signal in the first multiway analog switch of described testing circuit:
The voltage estimated value of the signal described to be detected obtained in advance and predeterminated voltage thresholding compare by described control circuit, when the voltage estimated value of described signal to be detected is more than or equal to described predeterminated voltage thresholding, select described second group of reference signal as described target reference signal, when the voltage estimated value of described signal to be detected is less than described predeterminated voltage thresholding, select described first group of reference signal as described target reference signal.
13. source current detection methods according to claim 12, is characterized in that, the way switch conducting that described control circuit controls the second multiway analog switch of described multiple amplifying circuit comprises:
The voltage estimated value of described signal to be detected compares with the magnitude of voltage of the magnitude of voltage in described first group of reference signal and described second group of reference signal by described control circuit respectively, according to comparative result determination object magnification, then controlling is the way switch conducting that the amplification channel of described object magnification is connected with enlargement factor in described second multiway analog switch.
14. source current detection methods according to claim 13, is characterized in that, described control circuit comprises according to comparative result determination object magnification:
Described control circuit is when the voltage estimated value of described signal to be detected is greater than the magnitude of voltage of described second group of reference signal, determine that described object magnification is the first enlargement factor, when the voltage estimated value of described signal to be detected is less than the magnitude of voltage of described first group of reference signal, determine that described object magnification is the second enlargement factor, when the voltage estimated value of described signal to be detected is greater than the magnitude of voltage of described first group of reference signal and is less than the magnitude of voltage of described second group of reference signal, determine that described object magnification is the 3rd enlargement factor; Wherein, described second enlargement factor is greater than described 3rd enlargement factor, and described 3rd enlargement factor is greater than described first enlargement factor.
15. source current detection methods according to any one of claim 9-14, it is characterized in that, described target reference signal comprises reference signal and earth signal, and described reference signal voltage sampled value comprises described reference signal voltage sampled value and earth signal voltage sample value;
The magnitude of voltage that described control circuit calculates described signal to be detected according to the magnitude of voltage of described reference signal voltage sampled value, described signal voltage sampled value to be detected and described target reference signal comprises:
Described control circuit is according to formula (M
v-M
gND)/V=(M
iREF-M
gND)/V
iREF, calculate the magnitude of voltage of described signal to be detected;
Wherein, M
vfor described signal voltage sampled value to be detected;
M
iREFfor described reference signal voltage sampled value;
M
gNDfor described earth signal voltage sample value;
V
iREFfor the magnitude of voltage of described target reference signal;
V is the magnitude of voltage of described signal to be detected.
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| CN103076486A (en) * | 2013-01-18 | 2013-05-01 | 浪潮电子信息产业股份有限公司 | Wiring method capable of improving power supply feedback precision |
| CN103217567A (en) * | 2013-04-19 | 2013-07-24 | 华为技术有限公司 | Current detection method and power detection circuit |
| CN104715988B (en) * | 2013-12-17 | 2017-05-24 | 中微半导体设备(上海)有限公司 | Plasma processing device and DC bias voltage measuring method for substrate of plasma processing device |
| CN109143032B (en) * | 2018-09-03 | 2021-12-14 | 苏州华兴源创科技股份有限公司 | Circuit board self-detection system |
| CN111596247B (en) * | 2020-01-13 | 2023-04-11 | 国网天津市电力公司 | Voltage detection circuit and method |
| CN112688687B (en) * | 2020-12-09 | 2022-07-12 | 南方电网数字电网研究院有限公司 | Method and device for acquiring physical information to be tested, computer equipment and storage medium |
| CN116295986B (en) * | 2023-05-24 | 2023-08-18 | 无锡卓海科技股份有限公司 | Optical signal processing device, method and stress detection system |
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