CN215297490U - Current detection circuit - Google Patents
Current detection circuit Download PDFInfo
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- CN215297490U CN215297490U CN202023347356.2U CN202023347356U CN215297490U CN 215297490 U CN215297490 U CN 215297490U CN 202023347356 U CN202023347356 U CN 202023347356U CN 215297490 U CN215297490 U CN 215297490U
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Abstract
The utility model relates to a current detection circuit, include: the current acquisition module is provided with a plurality of acquisition channels and is used for acquiring received current signals; the amplifying module is used for adjusting the acquired current signal to form a signal to be detected; the conversion module is used for converting the received signal to be detected into a digital signal from an analog signal; the processing module is provided with a current detection channel corresponding to the acquisition channel and is used for analyzing the received digital signal; and the current acquisition module is respectively connected with a positive input end of a power supply to be detected and a negative input end of the power supply to be detected. The processor switches corresponding current gears according to the acquired current signals to detect, so that a current detection mode of segmenting gears is realized, the material cost is obviously reduced, the higher current resolution is realized, and the detection precision is improved.
Description
Technical Field
The utility model relates to a circuit detection technical field especially relates to a current detection circuit.
Background
Because the ADC device is difficult to be low-cost and high-speed and high-resolution due to the influence of semiconductor manufacturing process, the current industrial testing equipment or apparatus uses the ADC device with high-speed and high-resolution to perform analog quantity detection in order to achieve the purposes of high-speed sampling, wide detection range, and high-resolution current detection. However, the detection cost is high by using the ADC device with high speed and high resolution, and the current jump detection and the high-frequency spike scan cannot be realized by using the ADC device with low speed and high resolution, so that the design requirement cannot be met. In order to meet project requirements and save cost, people use high-speed low-resolution and low-speed high-resolution instruments for combined detection, the method enables small and medium-sized companies or project groups to face purchase of multiple devices or instruments, multiple devices or instruments are needed to be arranged in parallel during use, and meanwhile maintenance cost and labor are increased.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem or at least partially solve the technical problem, the present application provides a current detection circuit, which can effectively reduce maintenance cost and labor, and achieve low cost, high speed and high resolution.
The application provides a current detection circuit, includes:
the current acquisition module is provided with a plurality of acquisition channels and is used for acquiring received current signals;
the amplifying module is used for adjusting the acquired current signal to form a signal to be detected;
the conversion module is used for converting the received signal to be detected into a digital signal from an analog signal;
the processing module is provided with a current detection channel corresponding to the acquisition channel and is used for analyzing the received digital signal;
and the current acquisition module is respectively connected with a positive input end of a power supply to be detected and a negative input end of the power supply to be detected.
Preferably, the current collection module includes current sampling resistor and MOS pipe, current sampling resistor' S one end and being surveyed power supply negative pole input and being connected, the other end with the S utmost point of MOS pipe is connected, the G utmost point of MOS pipe with conversion module connects, the input of amplification module with current sampling resistor connects.
Preferably, a parasitic diode is connected between the S pole and the D pole of the MOS tube, and the direction of the parasitic diode is directed to the D pole from the S pole.
Preferably, the amplifying module is an integrated operational amplifier, an inverting input terminal and a non-inverting input terminal of the integrated operational amplifier are respectively connected to two ends of the current sampling resistor, and an output terminal of the integrated operational amplifier is connected to the converting module.
Preferably, at least two current sampling resistors are arranged, one end of each current sampling resistor after being connected in parallel is connected with the input end of the negative electrode of the power supply to be tested, and the other end of each current sampling resistor is connected with the S pole of the MOS tube; the integrated operational amplifiers are at least provided with two, the inverting input end and the non-inverting input end of each integrated operational amplifier are respectively connected with two ends of one corresponding current sampling resistor, and the output ends of the integrated operational amplifiers are connected with the conversion module.
Preferably, the amplifying module is a relay, an input end of the relay is connected with the current sampling resistor, and an output end of the relay is connected with the converting module.
Preferably, the conversion module comprises a multichannel ADC device, an input end of the ADC device is connected to an output end of the integrated operational amplifier, and an output end of the ADC device is connected to the processing module.
Preferably, the output terminal of the ADC device is connected to the processing module via a serial data bus, a parallel data bus, or a high speed differential data bus.
Preferably, a functional interface GPIO for controlling the current gear is provided on the processing module.
Preferably, the current detection circuit still includes voltage sampling module, voltage sampling module includes first voltage sampling resistance and second voltage sampling resistance, the one end of first voltage sampling resistance with the one end of second voltage sampling resistance is connected, the other end of first voltage sampling resistance is connected with the anodal input of power of being surveyed, the other end of second voltage sampling resistance with current acquisition module connects, the input of ADC device is connected between first voltage sampling resistance and second voltage sampling resistance.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the current signal of detecting components and parts is gathered through the collection passageway that corresponds on the current acquisition module, then the current signal who gathers is adjusted to the amplification module, the current signal after the regulation is through the conversion module current signal conversion digital signal after will adjusting, and carry the processing module on and carry the analysis through the current detection passageway that corresponds, if the current value is not in the current channel that corresponds, processing module switches to and detects the electric current of gathering in the corresponding current channel, if the current value is in setting for the current channel, then end the detection to the electric current, obtain the effective value of electric current, the material cost has been showing and reduced, realize higher current resolution, the detection precision has been improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
In the drawings:
FIG. 1 is a schematic diagram of a current detection circuit in embodiment 1;
FIG. 2 is a circuit diagram of a current detection circuit in embodiment 1;
FIG. 3 is a flowchart of a current detection circuit in embodiment 1;
FIG. 4 is a schematic diagram of a current detection circuit in embodiment 2;
FIG. 5 is a circuit diagram of a current detection circuit in embodiment 2;
reference numerals: 1-a current collection module; 2-an amplifying module; 3-a conversion module; 4-a processing module; 5-a voltage acquisition module; r1-current sampling resistor; r2 — first voltage sampling resistor; r3 — second voltage sampling resistor; a U-integrated operational amplifier; Q-MOS tube; BAT + -positive input end of power supply to be tested; BAT- -negative input end of power supply to be tested.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "upper", "lower", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention, but do not indicate that the device or element referred to must have a specific direction, and thus, should not be construed as limiting the present invention.
It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Example 1
As shown in fig. 1-3, the present application provides a current sensing circuit comprising:
the current acquisition module 1 is provided with a plurality of acquisition channels, and is used for acquiring received current signals;
the amplifying module 2 is used for adjusting the acquired current signal to form a signal to be detected;
the conversion module 3 is used for converting the received signal to be detected into a digital signal from an analog signal;
the processing module 4 is provided with a current detection channel corresponding to the acquisition channel and used for analyzing the received digital signal;
and the current collection module 1 is respectively connected with a positive input terminal BAT + of a power supply to be detected and a negative input terminal BAT-.
The detection circuit provided by the embodiment of the invention is provided with a plurality of current detection gears, current signals of detection components are acquired through corresponding acquisition channels on a current acquisition module 1, then an amplification module 2 adjusts the acquired current signals, the adjusted current signals are converted into digital signals through a conversion module 3 and are transmitted to a processing module 4 to be analyzed through corresponding current detection channels, if the current value is not in the corresponding current gear, the processing module 4 is switched into the corresponding current channel to detect the acquired current, and if the current value is in a set current channel, the detection of the current is finished to obtain the effective value of the current; it should be noted that, the current not in the corresponding current channel includes not only the current channel larger than the set current channel but also the current channel smaller than the set current channel, if the current is larger than the corresponding current channel and does not exceed the maximum current gear, the processing module 4 switches to the higher current channel to detect the current, and if the current is smaller than the corresponding current channel, the processing module 4 switches to the smaller current channel to detect the current, so that the maintenance cost and the labor cost are effectively reduced, and the low cost, the high rate and the high resolution are realized.
The current acquisition module comprises a current sampling resistor R1 and an MOS (metal oxide semiconductor) tube Q, one end of the current sampling resistor R1 is connected with the negative electrode input end of a detected power supply, the other end of the current sampling resistor R1 is connected with the S pole of the MOS tube Q, the G pole of the MOS tube Q is connected with the conversion module 3, and the input end of the amplification module 3 is connected with the current sampling resistor R1.
Further, in order to ensure that the MOS tube Q is burnt out due to overlarge voltage, a parasitic diode is connected between the S pole and the D pole of the MOS tube Q, and the direction of the parasitic diode is directed to the D pole from the S pole.
The amplifying module 2 is an integrated operational amplifier U, an inverting input terminal and a non-inverting input terminal of the integrated operational amplifier U are respectively connected to two ends of the current sampling resistor R, and an output terminal of the integrated operational amplifier U is connected to the converting module 3.
In this embodiment, at least two current sampling resistors R1 are provided, one end of each current sampling resistor R1 connected in parallel is connected to a negative input terminal BAT of the power supply to be detected, and the other end is connected to the S pole of the MOS transistor Q; similarly, at least two integrated operational amplifiers U are correspondingly arranged, the inverting input end and the non-inverting input end of each integrated operational amplifier U are respectively connected with two ends of a corresponding current sampling resistor R1, and the output end of each integrated operational amplifier U is connected with the conversion module 3. It should be noted that the current sampling resistor R1 is a low-temperature drift resistor with ultrahigh accuracy, so that the current collection accuracy is improved.
The conversion module 3 comprises a multichannel ADC device, the input end of the ADC device is connected with the output end of the integrated operational amplifier U, and the output end of the ADC device is connected with the processing module 4.
Wherein, the processing module 4 is provided with a functional interface GPIO for controlling current gears.
The output end of the ADC device is connected with the processing module 4 through a serial data bus, a parallel data bus or a high-speed differential data bus; in this embodiment, the output terminal of the ADC device is connected to the processing module 4 by using a high-speed differential data bus.
Example 2
Referring to fig. 4, based on embodiment 1, the amplifying module 3 in this embodiment may be a relay, an input end of the relay is connected to the current sampling resistor R1, and an output end of the relay is connected to the converting module 3.
Example 3
Referring to fig. 4-5, on the basis of embodiment 1, the present embodiment further includes a voltage sampling module 5, the voltage sampling module includes a first voltage sampling resistor R1 and a second voltage sampling resistor R2, one end of the first voltage sampling resistor R1 is connected to one end of the second voltage sampling resistor R2, the other end of the first voltage sampling resistor R1 is connected to the positive input terminal BAT + of the power supply to be detected, the other end of the second voltage sampling resistor R2 is connected to the current collecting module 1, and the input terminal of the ADC device is connected between the first voltage sampling resistor R1 and the second voltage sampling resistor R2.
The voltage is collected through the first voltage sampling resistor R1 and the second voltage sampling resistor R2, collected voltage signals are converted into digital signals through an ADC device, the digital signals are transmitted to the processing module 4 to be processed and analyzed, effective values of the voltage are obtained, and output power is obtained through calculation by combining detected current values.
It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. A current sensing circuit, comprising:
the current acquisition module is provided with a plurality of acquisition channels and is used for acquiring received current signals;
the amplifying module is used for adjusting the acquired current signal to form a signal to be detected;
the conversion module is used for converting the received signal to be detected into a digital signal from an analog signal; the processing module is provided with a current detection channel corresponding to the acquisition channel and is used for analyzing the received digital signal;
and the current acquisition module is respectively connected with a positive input end of a power supply to be detected and a negative input end of the power supply to be detected.
2. The current detection circuit according to claim 1, wherein the current collection module includes a current sampling resistor and an MOS transistor, one end of the current sampling resistor is connected to the negative input terminal of the power source to be detected, the other end of the current sampling resistor is connected to the S pole of the MOS transistor, the G pole of the MOS transistor is connected to the conversion module, and the input terminal of the amplification module is connected to the current sampling resistor.
3. The current detection circuit according to claim 2, wherein a parasitic diode is connected between the S pole and the D pole of the MOS transistor, and the direction of the parasitic diode is from the S pole to the D pole.
4. The current detection circuit according to claim 2, wherein the amplifying module is an integrated operational amplifier, an inverting input terminal and a non-inverting input terminal of the integrated operational amplifier are respectively connected to two ends of the current sampling resistor, and an output terminal of the integrated operational amplifier is connected to the converting module.
5. The current detection circuit according to claim 4, wherein at least two current sampling resistors are provided, one end of each current sampling resistor after being connected in parallel is connected with the negative input end of the power supply to be detected, and the other end of each current sampling resistor is connected with the S pole of the MOS tube; the integrated operational amplifiers are at least provided with two, the inverting input end and the non-inverting input end of each integrated operational amplifier are respectively connected with two ends of one corresponding current sampling resistor, and the output ends of the integrated operational amplifiers are connected with the conversion module.
6. The current detection circuit of claim 2, wherein the amplification module is a relay, an input of the relay is connected to the current sampling resistor, and an output of the relay is connected to the conversion module.
7. The current sensing circuit of claim 5, wherein the conversion module comprises a multi-channel ADC device, an input of the ADC device is connected to an output of the integrated operational amplifier, and an output of the ADC device is connected to the processing module.
8. The current sensing circuit of claim 7, wherein the output of the ADC device is coupled to the processing module via a serial data bus, a parallel data bus, or a high speed differential data bus.
9. The current detection circuit according to claim 1, wherein the processing module is provided with a functional interface GPIO for controlling the current tap position.
10. The current detection circuit according to claim 7, further comprising a voltage sampling module, wherein the voltage sampling module comprises a first voltage sampling resistor and a second voltage sampling resistor, one end of the first voltage sampling resistor is connected with one end of the second voltage sampling resistor, the other end of the first voltage sampling resistor is connected with the positive input end of the power supply to be detected, the other end of the second voltage sampling resistor is connected with the current sampling module, and the input end of the ADC device is connected between the first voltage sampling resistor and the second voltage sampling resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023347356.2U CN215297490U (en) | 2020-12-31 | 2020-12-31 | Current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023347356.2U CN215297490U (en) | 2020-12-31 | 2020-12-31 | Current detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN215297490U true CN215297490U (en) | 2021-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023347356.2U Active CN215297490U (en) | 2020-12-31 | 2020-12-31 | Current detection circuit |
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| CN (1) | CN215297490U (en) |
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