CN110632355A - Detection circuit and detection method for current with higher dynamic range - Google Patents
Detection circuit and detection method for current with higher dynamic range Download PDFInfo
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- CN110632355A CN110632355A CN201910860280.6A CN201910860280A CN110632355A CN 110632355 A CN110632355 A CN 110632355A CN 201910860280 A CN201910860280 A CN 201910860280A CN 110632355 A CN110632355 A CN 110632355A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/08—Circuits for altering the measuring range
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Measurement Of Current Or Voltage (AREA)
Abstract
The invention relates to the technical field of circuits, in particular to a detection circuit and a detection method for a current with a higher dynamic range, wherein the detection circuit comprises at least one current detection module which is connected between a voltage source and a load, and the at least one current detection module comprises: the rectifying unit group comprises a plurality of stages of rectifying units so as to obtain the resistance value of each stage of rectifying unit; the input end of the pure resistance unit is connected with the output end of the last stage of rectifying unit; the two groups of differential amplification units are used for detecting the voltage analog value of each current detection module; two groups of analog-to-digital conversion units for converting the voltage analog value of each current detection module into a voltage digital value of each current detection module; and the control module is used for detecting the current value of each current detection module. The technical scheme of the invention has the beneficial effects that: the same precision is ensured for both micro current and large current, the cost is low, and the power resistors with large current and small current are flexible to select.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a detection circuit and a detection method for high dynamic range current.
Background
The traditional current detection mode adopts a Hall sensor or resistance sampling detection, but the mode is difficult to realize under the condition of higher dynamic range detection, so that the same precision is ensured for both micro current and larger current, wherein, larger current detection error is inevitably caused, and a seesaw effect is formed.
There are three main sources of current detection errors: error of the current sensing device; error of amplifying circuit and error of ADC (analog-digital converter) and voltage source. For the current detection in a wider range, the amplitude range of the analog signal output by the current detection device is wider, different amplification factors are required to realize signal conditioning, if only one amplification factor is used, the precision of large and small ranges cannot be considered, and the final result is that the precision is higher in a small current section, the device tends to be saturated when the current is larger, the precision is lower, or even larger current cannot be measured at all, and vice versa. Therefore, the above problems are difficult problems to be solved by those skilled in the art.
Disclosure of Invention
In view of the above problems in the prior art, a detection circuit and a detection method for detecting a current with a high dynamic range are provided.
The specific technical scheme is as follows:
the invention provides a detection circuit of current with higher dynamic range, wherein the detection circuit comprises at least one current detection module which is connected between a voltage source and a load, the load is connected with a grounding terminal, and the at least one current detection module comprises:
the rectifying unit group comprises a plurality of stages of rectifying units, the input end of the rectifying unit of the first stage is connected with the voltage source, the input end of the rectifying unit of the later stage is connected with the output end of the rectifying unit of the previous stage, and the rectifying unit is used for acquiring the resistance value of each stage of the rectifying unit;
the input end of the pure resistance unit is connected with the output end of the rectifying unit of the last stage and is used for providing a pure resistance value for the current detection module of the last stage;
the two groups of differential amplification units comprise a first group of differential amplification subunits and a second group of differential amplification subunits, the input ends of the first group of differential amplification subunits are connected with the output ends of the rectifying unit groups, the input ends of the second group of differential amplification subunits are connected with the output ends of the pure resistance units, and the two groups of differential amplification units are used for detecting the voltage analog value of each current detection module;
the input end of each analog-to-digital conversion unit is respectively connected with the output end of each differential amplification unit and used for converting the voltage analog value of each current detection module into a voltage digital value of each current detection module;
the detection circuit further comprises a control module, wherein the input end of the control module is connected with the output end of each current detection module and is used for detecting the current value of each current detection module so as to select an optimal current value according to different detection current ranges.
Preferably, each stage of the rectifying unit includes:
the anode of the diode is connected to the anode of the voltage source and used for shunting the rectifying unit;
and the first resistor is connected between the anode and the cathode of the diode.
Preferably, the pure resistance unit includes a second resistance.
Preferably, the first group of differential amplification subunits comprises a plurality of first differential amplifiers, a non-inverting input terminal of each first differential amplifier is connected with an anode of the diode, and an inverting input terminal of each first differential amplifier is connected with a cathode of the diode.
Preferably, the second group of differential amplification subunits comprises a second differential amplifier, and the second resistor is connected between the non-inverting input end and the inverting input end of the second differential amplifier.
Preferably, the two groups of analog-to-digital conversion units include a plurality of analog-to-digital converters, and an input end of each analog-to-digital converter is connected to an output end of the first differential amplifier and an output end of the second differential amplifier, respectively.
Preferably, the control module is a field programmable gate array.
The invention also provides a detection method of a higher dynamic range current, which comprises at least one current detection module and adopts any one of the detection circuits of the higher dynamic range current, and the detection method comprises the following steps:
step S1, a rectifying unit group is adopted, and the rectifying unit group comprises a plurality of stages of rectifying units so as to obtain the resistance value of each stage of rectifying unit;
step S2, using a pure resistance unit to provide a pure resistance value to the current detection module of the last stage;
step S3, two groups of differential amplification units are adopted, wherein the two groups of differential amplification units comprise a first group of differential amplification sub-units and a second group of differential amplification sub-units, and the two groups of differential amplification units are used for detecting the voltage analog value of each current detection module;
step S4, using at least two analog-to-digital conversion units for converting the voltage analog value of each current detection module into a voltage digital value of each current detection module;
step S5, a control module is used to detect the current value of each current detection module, so as to select an optimal current value according to different current detection ranges.
The technical scheme of the invention has the beneficial effects that: the detection circuit and the detection method for the current with the higher dynamic range are provided, so that the same precision can be ensured for the micro current and the large current, the cost is low, and the power resistors with the large current and the small current can be flexibly selected.
Drawings
Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. The drawings are, however, to be regarded as illustrative and explanatory only and are not restrictive of the scope of the invention.
FIG. 1 is a circuit configuration diagram of an embodiment of the present invention;
FIG. 2 is a diagram of method steps for an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The invention provides a detection circuit of current in a higher dynamic range, wherein the detection circuit comprises at least one current detection module 1 which is connected between a voltage source V and a load 2, the load 2 is connected with a grounding end GND, and the at least one current detection module 1 comprises:
the rectifying unit group 10 comprises a plurality of stages of rectifying units 100, the input end of the first stage of rectifying unit 100 is connected with a voltage source V, the input end of the next stage of rectifying unit 100 is connected with the output end of the previous stage of rectifying unit 100, and the rectifying unit 100 is used for acquiring the resistance value of each stage of rectifying unit 100;
the input end of the pure resistance unit 11 is connected with the output end of the last stage of the rectifying unit 10 and is used for providing a pure resistance value for the last stage of the current detection module 1;
the two groups of differential amplification units 12, each of the two groups of differential amplification units 12 includes a first group of differential amplification subunits 120 and a second group of differential amplification subunits 121, an input end of the first group of differential amplification subunits 120 is connected with an output end of the rectifying unit group 10, an input end of the second group of differential amplification subunits 121 is connected with an output end of the pure resistance unit 11, and the two groups of differential amplification units 12 are used for detecting a voltage analog value of each current detection module 1;
the input end of each group of analog-to-digital conversion units 13 is respectively connected with the output end of each group of differential amplification units 12, and is used for converting the voltage analog value of each current detection module 1 into the voltage digital value of each current detection module 1;
the detection circuit further comprises a control module 3, wherein the input end of the control module 3 is connected with the output end of each current detection module 1 and is used for detecting the current value of each current detection module 1 so as to select an optimal current value according to different detection current ranges.
With the above-provided detection circuit, as shown in fig. 1, the detection circuit includes at least one current detection module 1, the current detection module 1 is connected between a voltage source V and a load 2, and the voltage source V is used for conducting the detection circuit.
Further, the current detection module 1 includes a rectifying unit group 10, a pure resistance unit 11, two differential amplifying units 12, and two analog-to-digital conversion units 13, where the rectifying unit group 10 includes a plurality of stages of rectifying units 100, an input end of a first stage of the rectifying unit 100 in the rectifying unit group 10 is connected to the voltage source V, an input end of a next stage of the rectifying unit 100 is connected to an output end of a previous stage of the rectifying unit 100, and the rectifying unit 100 of each stage is configured to obtain a resistance value of each stage of the rectifying unit 100, that is, obtain a resistance value of each current detection module 1 that does not include the pure resistance unit 11.
Further, the input end of the pure resistance unit 11 is connected to the output end of the last stage of the rectifying unit 100 to obtain the resistance value of the current detection module 1 including the pure resistance unit 11, the two sets of differential amplifying units 12 include a first set of differential amplifying subunits 120 and a second set of differential amplifying subunits 121, the input end of the first set of differential amplifying subunits 120 is connected to the output end of the rectifying unit group 10, the input end of the second set of differential amplifying subunits 121 is connected to the output end of the pure resistance unit 11, the first set of differential amplifying subunits 120 is used for detecting and amplifying the voltage analog value of each stage of the rectifying unit 100, and the second set of differential amplifying subunits 121 is used for detecting and amplifying the voltage analog value in the pure resistance unit 11.
Further, the two sets of analog-to-digital conversion units 13 respectively connect the input end of each set of analog-to-digital conversion unit 13 to the output end of each set of differential amplification unit 12, and convert the voltage analog value of each current detection module 1 into the voltage digital value of each current detection module 1 through the analog-to-digital conversion unit 13.
Further, the output end of each current detection module 1 is connected to the output end of the control module 3, and the current value of each current detection module 1 is detected by the control module 3 according to the resistance value and the voltage digital value of each current detection module 1, and the optimal current value is selected.
In this embodiment, the current with a high dynamic range of 10mA to 100A is selected and divided into 3 current detection modules 1, wherein the current range for dividing the first current detection module 1 is between 10mA to 500mA, the current range for dividing the second current detection module 1 is between 500mA to 10A, and the current range for dividing the third current detection module 1 is between 10A to 100A.
Further, if the on-voltage of the first stage of the rectifying unit 100 is 1.1V, it can be calculated that the resistance R31 of the first current detection module 1 is <1.1V/0.5A is 2.2 Ω, and if R31 is 2 Ω, it can be calculated that the voltage U1 of the first current detection module 1 is in the range of 20mV to 1V, and then the differential amplifier CMR1 of the first current detection module 1 detects and amplifies the voltage signal of the voltage U1, and transmits the voltage signal to the control module 3.
Further, similarly, if the resistance R32<1.1V/10A of the second current detection module 1 is calculated to be 0.11 Ω, and if R32 is selected to be 0.1 Ω, the voltage U2 of the second current detection module 1 can be calculated to be in the range of 50mV to 1V, and the voltage signal of the voltage U2 is detected by the differential amplifier CMR2 of the second current detection module 1, amplified, and transmitted to the control module 3.
Further, similarly, if the resistance R33<1.1V/100A of the third current detection module 1 is calculated to be 11m Ω, and if R33 is selected to be 10m Ω, the voltage U3 of the third current detection module 1 can be calculated to be in the range of 11mV to 1V, and the voltage signal of the voltage U3 is detected by the differential amplifier CMR3 of the third current detection module 1, amplified, and transmitted to the control module 3.
Further, the control module 3 detects the current value of each current detection module 1 according to the resistance value and the voltage value of each current detection module 1.
Further, according to the obtained resistance, the on-state voltage is constant, when the load 2 changes, the current value passing through the load 2 can be selected out the optimal current value according to the current values detected in the 3 current detection modules 1,
when the calculated current value is within the current value range of the first current detection module 1, the current value of the first current detection module 1 is selected, when the calculated current value is within the current value range of the second current detection module 1, the current value of the second current detection module 1 is selected, and when the calculated current value is within the current value range of the third current detection module 1, the current value of the third current detection module 1 is selected, so that the precise detection of the current with the high dynamic range of 10 mA-100A is realized.
In a preferred embodiment, each stage of the rectifier unit 100 includes:
a diode D, an anode of which is connected to an anode of the voltage source V, for shunting the rectifying unit 100;
a first resistor R1, the first resistor R1 is connected between the anode and cathode of the diode D.
Specifically, the diode D and the first resistor R1 in each stage of the rectifying unit 100 are connected in parallel to form an electronic switch, and when the value of the first resistor R1 is too large, the passing current value is small, and can be shunted by the diode D connected in parallel to the first resistor R1, so that a tiny current value can be detected.
In a preferred embodiment, the pure resistor unit 11 includes a second resistor R2.
In a preferred embodiment, the first set of differential amplification subunits 120 comprises a plurality of first differential amplifiers CMR10, each first differential amplifier CMR10 having a non-inverting input connected to the anode of a diode D and each first differential amplifier CMR10 having an inverting input connected to the cathode of a diode D.
The second group of differential amplifying sub-units 121 includes a second differential amplifier CMR11, and a second resistor R2 is connected between the non-inverting input terminal and the inverting input terminal of the second differential amplifier CMR 11.
In a preferred embodiment, the two sets of analog-to-digital conversion units 13 include a plurality of analog-to-digital converters ADC, wherein each analog-to-digital converter ADC has an input terminal connected to an output terminal of the first differential amplifier CMR10 and an output terminal of the second differential amplifier CMR11, respectively, and is a high-precision analog-to-digital converter ADC.
In a preferred embodiment, the control module 3 is a field programmable gate array.
Specifically, in this embodiment, the control module 3 may be a field programmable gate array FPGA or a bit ARM microprocessor.
The invention also provides a detection method of a higher dynamic range current, which comprises at least one current detection module 1 and adopts any one of the detection circuits of the higher dynamic range current, and the detection method comprises the following steps:
step S1, a rectifying unit group 10 is adopted, where the rectifying unit group 10 includes multiple stages of rectifying units 100 to obtain a resistance value of each stage of rectifying unit 100;
step S2, using a pure resistance unit 11 to provide a pure resistance value to the last stage of the current detection module 1;
step S3, two groups of differential amplification units 12 are adopted, each group of differential amplification units 12 includes a first group of differential amplification subunits 120 and a second group of differential amplification subunits 121, and each group of differential amplification units 12 is configured to detect a voltage analog value of each current detection module 1;
step S4, using at least two analog-to-digital conversion units 13, for converting the voltage analog value of each current detection module 1 into a voltage digital value of each current detection module 1;
in step S5, a control module 3 is used to detect the current value of each current detection module 1, so as to select an optimal current value according to different current detection ranges.
With the above provided detection method, as shown in fig. 2, the detection circuit includes at least one current detection module 1.
Further, the resistance value of each stage of the rectifying unit 100, that is, the resistance value of each current detection module 1 excluding the pure resistance unit 11 is obtained first by the rectifying unit group 10.
Further, the pure resistance value is provided to the current detection module 1 of the last stage through the pure resistance unit 11, that is, the resistance value of the current detection module 1 including the pure resistance unit 11 is obtained.
Further, the two sets of differential amplifying units 12 include a first set of differential amplifying subunits 120 and a second set of differential amplifying subunits 121, the analog voltage value of each stage of the rectifying unit 100 is detected and amplified by the first set of differential amplifying subunits 120, and the analog voltage value of the pure resistance unit 11 is detected and amplified by the second set of differential amplifying subunits 121.
Further, the voltage analog value of each current detection block 1 is converted into a voltage digital value of each current detection block 1 by the analog-to-digital conversion unit 13.
Further, the control module 3 detects the current value of each current detection module 1 based on the resistance value and the voltage digital value of each current detection module 1, and selects the optimal current value.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. A detection circuit for detecting a high dynamic range current, the detection circuit comprising at least one current detection module connected between a voltage source and a load, the load being connected to a ground, the at least one current detection module comprising:
the rectifying unit group comprises a plurality of stages of rectifying units, the input end of the rectifying unit of the first stage is connected with the voltage source, the input end of the rectifying unit of the later stage is connected with the output end of the rectifying unit of the previous stage, and the rectifying unit is used for acquiring the resistance value of each stage of the rectifying unit;
the input end of the pure resistance unit is connected with the output end of the rectifying unit of the last stage and is used for providing a pure resistance value for the current detection module of the last stage;
the two groups of differential amplification units comprise a first group of differential amplification subunits and a second group of differential amplification subunits, the input ends of the first group of differential amplification subunits are connected with the output ends of the rectifying unit groups, the input ends of the second group of differential amplification subunits are connected with the output ends of the pure resistance units, and the two groups of differential amplification units are used for detecting the voltage analog value of each current detection module;
the input end of each analog-to-digital conversion unit is respectively connected with the output end of each differential amplification unit and used for converting the voltage analog value of each current detection module into a voltage digital value of each current detection module; the detection circuit further comprises a control module, wherein the input end of the control module is connected with the output end of each current detection module and is used for detecting the current value of each current detection module so as to select an optimal current value according to different detection current ranges.
2. A higher dynamic range current sense circuit as claimed in claim 1, wherein each stage of said rectifying unit comprises:
the anode of the diode is connected to the anode of the voltage source and used for shunting the rectifying unit;
and the first resistor is connected between the anode and the cathode of the diode.
3. A higher dynamic range current sense circuit as in claim 1 wherein said purely resistive element comprises a second resistor.
4. The higher dynamic range current sense circuit of claim 1, wherein said first set of differential amplifier sub-units comprises a plurality of first differential amplifiers, each of said first differential amplifiers having a non-inverting input connected to an anode of said diode and an inverting input connected to a cathode of said diode.
5. A higher dynamic range current sense circuit as claimed in claim 1 wherein said second set of differential amplifier sub-units comprises a second differential amplifier, said second resistor being connected between the non-inverting and inverting inputs of said second differential amplifier.
6. The circuit of claim 1, wherein the two sets of analog-to-digital conversion units comprise a plurality of analog-to-digital converters, and an input terminal of each analog-to-digital converter is connected to an output terminal of the first differential amplifier and an output terminal of the second differential amplifier.
7. The higher dynamic range current sense circuit of claim 1, wherein said control module is a field programmable gate array.
8. A method for detecting a higher dynamic range current, comprising at least one current detection module, using a higher dynamic range current detection circuit according to any one of claims 1 to 6, the method comprising:
step S1, a rectifying unit group is adopted, and the rectifying unit group comprises a plurality of stages of rectifying units so as to obtain the resistance value of each stage of rectifying unit;
step S2, using a pure resistance unit to provide a pure resistance value to the current detection module of the last stage;
step S3, two groups of differential amplification units are adopted, wherein the two groups of differential amplification units comprise a first group of differential amplification sub-units and a second group of differential amplification sub-units, and the two groups of differential amplification units are used for detecting the voltage analog value of each current detection module;
step S4, using at least two analog-to-digital conversion units for converting the voltage analog value of each current detection module into a voltage digital value of each current detection module;
step S5, a control module is used to detect the current value of each current detection module, so as to select an optimal current value according to different current detection ranges.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910860280.6A CN110632355A (en) | 2019-09-11 | 2019-09-11 | Detection circuit and detection method for current with higher dynamic range |
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| CN114167112A (en) * | 2021-12-16 | 2022-03-11 | 青岛东软载波智能电子有限公司 | High-precision wide-range low-differential-voltage current measuring circuit |
| CN114221701A (en) * | 2021-12-27 | 2022-03-22 | 南京牛芯微电子有限公司 | Circuit and method for detecting intensity of received signal of optical receiver |
| WO2022193881A1 (en) * | 2021-03-19 | 2022-09-22 | 大唐恩智浦半导体（徐州）有限公司 | Current detection circuit for monitoring current source, and integrated circuit |
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| WO2022193881A1 (en) * | 2021-03-19 | 2022-09-22 | 大唐恩智浦半导体（徐州）有限公司 | Current detection circuit for monitoring current source, and integrated circuit |
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Application publication date: 20191231 |