CN116165420B - Current detection circuit and device - Google Patents
Current detection circuit and device Download PDFInfo
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- CN116165420B CN116165420B CN202310423751.3A CN202310423751A CN116165420B CN 116165420 B CN116165420 B CN 116165420B CN 202310423751 A CN202310423751 A CN 202310423751A CN 116165420 B CN116165420 B CN 116165420B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The application discloses a current detection circuit and a device, which relate to the field of circuits, and realize a final second voltage signal of a current signal of a bus to be detected through a detection resistor, a conversion module and a conversion resistor, detect a jump signal of the second voltage signal through a difference detection module, output a corresponding third voltage signal based on the jump signal, and further realize the detection of current through the jump signal of a detection voltage. The current detection circuit can be suitable for the weak voltage field by converting the current signal into the voltage signal so as to amplify the voltage signal and/or improve the driving capability and the like, realizes the detection of the current under the condition of low-voltage power supply of an integrated chip or an on-chip integrated circuit and the like, so as to effectively detect the small current in the integrated chip or the on-chip integrated circuit, particularly the jump signal of the small current under the condition of an M-bus and the like, expands the application range of the current detection technology and is beneficial to the further development of the power technology.
Description
Technical Field
The present application relates to the field of circuits, and in particular, to a current detection circuit and a device.
Background
Along with the continuous development of the electric power technology, how to detect the related parameters of electricity consumption such as current becomes the development direction of more and more attention, and the current is the most basic physical quantity in electricity, so that the working states of loads and circuits can be intuitively reflected through the current detection. Different current detection circuits are required to be arranged in the high-voltage field and the weak-voltage field, the low-voltage field mainly refers to that the power supply voltage is very low, the corresponding circuit can only work in a low power supply voltage state, the current to be detected in the circuit is also in a very small state, and a commonly applied low-voltage circuit is provided with circuits such as an on-chip integrated circuit or an integrated chip. How to effectively detect the small current, especially the jump of the small current, in the integrated circuit on the chip or the integrated chip and other circuits is the problem which needs to be solved at present. In the prior art, a current detection circuit for the small current condition is not good, so that related staff cannot effectively judge the small current.
Disclosure of Invention
The application aims to provide a current detection circuit and a device, which realize the current detection process by detecting a jump signal of voltage. The current detection circuit provided by the application can be suitable for the weak voltage field by converting the current signal into the voltage signal so as to amplify the voltage signal and/or improve the driving capability and the like, and can detect the current under the condition of low-voltage power supply of an integrated chip or an on-chip integrated circuit and the like so as to effectively detect small current in the integrated chip or the on-chip integrated circuit, particularly jump signals of the small current under the condition of an M-bus and the like, thereby expanding the application range of the current detection technology and being beneficial to the further development of the power technology.
In order to solve the above technical problems, the present invention provides a current detection circuit, including: the device comprises a detection resistor, a conversion module, a bias current module, a conversion resistor and a difference detection module;
the first end of the detection resistor is respectively connected with the input end of the conversion module and the bus to be detected, the second end of the detection resistor is grounded, the output end of the conversion module is respectively connected with the output end of the bias current module, the first end of the conversion resistor is connected with the input end of the difference detection module, the second end of the conversion resistor is grounded, and the output end of the difference detection module is used as the output end of the current detection circuit;
the detection resistor is used for converting the current signal of the bus to be detected into a first voltage signal;
the conversion module is used for converting the first voltage signal into a corresponding first current signal, the first current signal is in linear correlation with the first voltage signal, and the direction of the first current signal is consistent with the direction of the output current of the bias current module;
the conversion resistor is used for converting the first current signal into a corresponding second voltage signal;
the difference detection module is used for detecting the jump signal of the second voltage signal and outputting a third voltage signal corresponding to the second voltage signal based on the jump signal of the second voltage signal.
Preferably, the conversion module comprises a first operational amplifier module and a following module;
the input end of the first operational amplifier module is respectively connected with the first end of the detection resistor and the bus to be detected, the output end of the first operational amplifier module is connected with the input end of the following module, the output end of the following module is respectively connected with the output end of the bias current module, and the first end of the conversion resistor is connected with the input end of the difference detection module;
the first operational amplifier module is used for converting the first voltage signal into a corresponding second current signal, and the second current signal is in linear correlation with the first voltage signal;
the following module is used for converting the second current signal into a corresponding first current signal, the first current signal is in linear correlation with the second current signal, the direction of the second current signal is consistent with the direction of the first current signal, and the direction of the first current signal is consistent with the direction of the output current of the bias current module.
Preferably, the first operational amplifier module includes: the first operational amplifier, the operational amplifier switch and the voltage dividing resistor;
the non-inverting input end of the first operational amplifier is connected with the first end of the detection resistor and the bus to be detected respectively, the output end of the first operational amplifier is connected with the inverting input end of the first operational amplifier respectively, the first end of the operational amplifier switch is connected with the first end of the voltage dividing resistor, the second end of the voltage dividing resistor is grounded, and the second end of the operational amplifier switch is connected with the input end of the following module.
Preferably, the following module includes: a first PMOS, a second PMOS, a first NMOS and a second NMOS;
the first end of the first PMOS is connected with a power supply, the second end of the first PMOS is connected with the control end of the first PMOS and the second end of the operational amplifier switch respectively, the control end of the first PMOS is also connected with the control end of the second PMOS, the first end of the second PMOS is connected with the power supply, the second end of the second PMOS is connected with the first end of the first NMOS and the control end of the first NMOS respectively, the second end of the first NMOS is grounded, the control end of the first NMOS is also connected with the control end of the second NMOS, and the first end of the second NMOS is used as the output end of the following module and the second end of the second NMOS is grounded.
Preferably, the bias current module includes: a reference current source and a bias module; the input end of the reference current source is connected with the bias module, the output end of the reference current source is respectively connected with the output end of the conversion module, and the first end of the conversion resistor is connected with the input end of the difference detection module;
the reference current source is used for outputting fixed bias current in cooperation with the bias module.
Preferably, the method further comprises: the second operational amplifier module; the input end of the second operational amplifier module is respectively connected with the output end of the bias current module, the first end of the conversion resistor is connected with the output end of the conversion module, and the output end of the second operational amplifier module is connected with the input end of the difference detection module;
The second operational amplifier module is used for improving the driving capability of the second voltage signal.
Preferably, the difference detection module includes: the device comprises a capacitor, a charging module, a discharging module and a differential amplifier;
the input end of the charging module is respectively connected with the output end of the conversion module, the output end of the bias current module is connected with the first end of the conversion resistor, the first output end of the charging module is respectively connected with the first end of the capacitor and the second input end of the differential amplifier, the second output end of the charging module is connected with the first input end of the differential amplifier, the second end of the capacitor is grounded, the discharging module is respectively connected with the first end of the capacitor and the second input end of the differential amplifier, and the output end of the differential amplifier is used as the output end of the current detection circuit;
the charging module is used for charging the capacitor when the second voltage signal is lower than a preset value;
and the discharging module is used for discharging the capacitor when the second voltage signal is higher than a preset value.
Preferably, the charging module includes: the charging device comprises a first unidirectional conduction module, a second unidirectional conduction module and a charging resistor;
The positive pole of the first unidirectional conduction module is respectively connected with the output end of the conversion module, the output end of the bias current module is connected with the first end of the conversion resistor, the negative pole of the first unidirectional conduction module is respectively connected with the positive pole of the second unidirectional conduction module and the first input end of the differential amplifier, the negative pole of the second unidirectional conduction module is connected with the first end of the charging resistor, and the second end of the charging resistor is respectively connected with the first end of the capacitor and the second input end of the differential amplifier.
Preferably, the discharging module includes: the third unidirectional conduction module comprises a first discharge resistor and a second discharge resistor;
the first end of the first discharging resistor is grounded, the second end of the first discharging resistor is respectively connected with the negative electrode of the first unidirectional conduction module, the positive electrode of the second unidirectional conduction module is connected with the negative electrode of the third unidirectional conduction module, the positive electrode of the third unidirectional conduction module is respectively connected with the first end of the capacitor, the second input end of the differential amplifier is connected with the first end of the second discharging resistor, and the second end of the second discharging resistor is grounded.
In order to solve the technical problems, the invention also provides a current detection device which comprises a bus to be detected and the current detection circuit, wherein the bus to be detected is connected with the current detection circuit.
The application provides a current detection circuit which comprises a detection resistor, a conversion module, a bias current module, a conversion resistor and a difference detection module, wherein the detection resistor is connected with the conversion module; the detection resistor converts a current signal of the bus to be detected into a first voltage signal, the first voltage signal is converted into a corresponding first current signal through the conversion module, the first current signal is converted into a corresponding second voltage signal through the conversion resistor, finally a jump signal of the second voltage signal is detected through the difference detection module, a third voltage signal corresponding to the second voltage signal is output based on the jump signal, and the current detection process is further realized through the jump signal of the detection voltage. The current detection circuit provided by the application can be suitable for the weak voltage field by converting the current signal into the voltage signal so as to amplify the voltage signal and/or improve the driving capability and the like, and can detect the current under the condition of low-voltage power supply of an integrated chip or an on-chip integrated circuit and the like so as to effectively detect small current in the integrated chip or the on-chip integrated circuit, particularly jump signals of the small current under the condition of an M-bus and the like, thereby expanding the application range of the current detection technology and being beneficial to the further development of the power technology.
The application also provides a current detection device which has the same beneficial effects as the current detection circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a current detection circuit according to the present application;
FIG. 2 is a schematic diagram of another current detection circuit according to the present application;
fig. 3 is a schematic structural diagram of a difference detection module in a current detection circuit according to the present application;
fig. 4 is a schematic signal waveform diagram of a difference detection module according to the present application;
fig. 5 is a schematic structural diagram of a current detecting device according to the present application.
Detailed Description
The application provides a current detection circuit and a device, which realize the current detection process by detecting a jump signal of voltage. The current detection circuit provided by the application can be suitable for the weak voltage field by converting the current signal into the voltage signal so as to amplify the voltage signal and/or improve the driving capability and the like, and can detect the current under the condition of low-voltage power supply of an integrated chip or an on-chip integrated circuit and the like so as to effectively detect small current in the integrated chip or the on-chip integrated circuit, particularly jump signals of the small current under the condition of an M-bus and the like, thereby expanding the application range of the current detection technology and being beneficial to the further development of the power technology.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The current detection circuit provided by the application can be applied to an M-bus system and other weak voltage fields, and particularly can be applied to the inside of a chip, and in general, in order to ensure the miniaturization and integration of the chip, the power supply voltage in the chip is smaller. The present application is not particularly limited herein, and may be selected according to actual requirements, for example, in the application scenario and specific application of the current detection circuit of the present application. Detailed description of the embodiments are described below.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a current detection circuit according to the present application;
referring to fig. 2, fig. 2 is a schematic structural diagram of another current detection circuit according to the present application;
In order to solve the above technical problems, the present invention provides a current detection circuit, including: the device comprises a detection resistor RSENSE, a conversion module 1, a bias current module 2, a conversion resistor R2 and a difference detection module 3;
the first end of the detection resistor RSENSE is respectively connected with the input end of the conversion module 1 and the bus to be detected, the second end of the detection resistor RSENSE is grounded, the output end of the conversion module 1 is respectively connected with the output end of the bias current module 2, the first end of the conversion resistor R2 is connected with the input end of the difference detection module 3, the second end of the conversion resistor R2 is grounded, and the output end of the difference detection module 3 is used as the output end of the current detection circuit;
the detection resistor RSENSE is used for converting a current signal of the bus to be detected into a first voltage signal;
the conversion module 1 is configured to convert a first voltage signal into a corresponding first current signal, where the first current signal is linearly related to the first voltage signal, and the direction of the first current signal is consistent with the direction of the output current of the bias current module 2;
the conversion resistor R2 is used for converting the first current signal into a corresponding second voltage signal;
the difference detection module 3 is configured to detect a transition signal of the second voltage signal, and output a third voltage signal corresponding to the second voltage signal based on the transition signal of the second voltage signal.
Specifically, the corresponding current to be detected on the bus to be detected is connected to the first end of the detection resistor RSENSE, the detection resistor RSENSE converts the current to be detected into a first voltage signal, namely a first voltage signal, the first voltage signal is linearly related to the current to be detected due to the fact that the characteristics of the resistor are known, the input end of the conversion module 1 is connected with the first end of the detection resistor RSENSE, the first voltage signal is input into the conversion module 1, the conversion module 1 converts the first voltage signal into a first current signal, the output end of the conversion module 1 is connected with the output end of the bias current module 2, it is understood that a part of the current output by the bias current module 2 flows into the conversion module 1 to serve as the first current signal, the other part of the current flows through the conversion resistor R2, the conversion resistor R2 converts the first voltage signal into a first end of the conversion resistor R2, namely a second voltage signal, the second voltage signal is linearly related to the first current signal due to the characteristics of the resistor, after the difference value detection module 3 receives the second voltage signal, the second voltage signal can be correspondingly output according to the detected second voltage signal, and then the third voltage signal can be analyzed by a remote end of a person.
It can be understood that after the first voltage signal is received, the conversion module 1 may amplify and/or enhance the first voltage signal, and then convert the first voltage signal into the first current signal, so as to facilitate accuracy and stability of the subsequent second voltage signal and third voltage signal, and further ensure reliability and safety of the final output result. The conversion module 1 converts the first voltage signal into the first current signal, which is mainly convenient for transmission and conversion, the voltage signal is easy to distort in the transmission process, lost and is easy to be interfered by factors such as electromagnetism, obvious errors can be caused, and if the transmission path is longer, excessive pressure drop can be caused, so that the finally output signal has the problems of large loss degree, excessive loss, difficult detection and the like. The circuit structure, the specific implementation mode and the like of the conversion module 1 are not particularly limited, and can be adjusted according to actual application requirements.
Considering that the subsequent analysis process needs to calculate the current and/or voltage parameters in the circuit to determine the specific value thereof, the bias current module 2 is set to output a fixed current, so as to provide a current source for the conversion module 1, facilitate the conversion of the current signal into the voltage signal by the conversion resistor R2, and meanwhile, the known fixed current is beneficial to the subsequent specific calculation of the circuit parameters such as the first current signal, the second voltage signal and the like, and meanwhile, a static working point can be provided for devices in the circuit, thereby being convenient for realizing the control circuit and changing the parameters and other operations according to the actual requirements. The present application is not particularly limited herein with respect to the circuit configuration, the specific implementation, and the like of the bias current module 2.
Specifically, the first current signal may be calculated by the first voltage signal and the resistance value of the detection resistor RSENSE, and the current flowing through the conversion resistor R2 may be calculated according to the first current signal and the output current of the bias current module 2, and then the value of the second voltage signal may be calculated according to the resistance value of the conversion resistor R2. Further, the first voltage signal can be analyzed through the output second voltage signal, so that analysis and calculation of the current signal to be detected are realized.
Specifically, the difference detection module 3 may amplify and/or enhance the second voltage signal, for the jump signal of the second voltage signal, the difference detection module 3 may rapidly detect and amplify the jump signal, and finally output an amplified third voltage signal, but basically the third voltage signal is consistent with the second voltage signal, and may invert the change condition of the current to be detected according to the third voltage signal, and due to the detection and amplification process of the jump signal, for the change condition of the current to be detected, the third voltage signal may be more accurate, more obvious and clear, so as to effectively implement the detection process of the current to be detected, which is beneficial to the subsequent analysis process of the current to be detected. The circuit structure and the specific implementation of the difference detection module 3 are not particularly limited, and the application can be adjusted according to the actual application requirement and the current to be detected, specifically referring to fig. 2, the difference detection module 3 is composed of a difference signal detection circuit 23 and a capacitor Css.
It should be noted that, in the whole working process, the current to be detected is converted between voltage and current, and is converted into a voltage signal, and the voltage signal can be amplified and/or signal-enhanced through devices such as an operational amplifier, so that the signal strength can be improved, the stability and reliability of the signal can be ensured, and the current signal can be converted into a current signal for more effective transmission, so that the current transmission is more accurate and reliable, safe and effective, and the current signal can be amplified through circuit structures such as a current mirror, so that the accuracy and the effectiveness of the final output signal can be ensured.
Specifically, the application is not particularly limited in terms of specific types and resistance values of the detection resistor RSENSE and the conversion resistor R2, and the application can be adjusted according to practical application requirements, specific circuit structures and the like, and generally, the types and the resistance values of the detection resistor RSENSE and the conversion resistor R2 can be the same or different, and under normal conditions, a fixed resistor is selected as the detection resistor RSENSE and the conversion resistor R2, and an adjustable resistor can be selected, so that the adjustable resistor is more convenient to adjust at any time to adapt to different application requirements, and the fixed resistor is more stable and reliable and is convenient to calculate.
The application provides a current detection circuit which comprises a detection resistor RSENSE, a conversion module 1, a bias current module 2, a conversion resistor R2 and a difference detection module 3, wherein the detection resistor RSENSE is connected with the bias current module; the detection resistor RSENSE converts a current signal of a bus to be detected into a first voltage signal, the first voltage signal is converted into a corresponding first current signal through the conversion module 1, the first current signal is converted into a corresponding second voltage signal through the conversion resistor R2, finally a jump signal of the second voltage signal is detected through the difference detection module 3, a third voltage signal corresponding to the second voltage signal is output based on the jump signal, and the current detection process is further realized through the jump signal of the detection voltage. The current detection circuit provided by the application can be suitable for the weak voltage field by converting the current signal into the voltage signal so as to amplify the voltage signal and/or improve the driving capability and the like, and can detect the current under the condition of low-voltage power supply of an integrated chip or an on-chip integrated circuit and the like so as to effectively detect small current in the integrated chip or the on-chip integrated circuit, particularly jump signals of the small current under the condition of an M-bus and the like, thereby expanding the application range of the current detection technology and being beneficial to the further development of the power technology.
On the basis of the above-described embodiments,
as a preferred embodiment, the conversion module 1 comprises a first op-amp module and a following module;
the input end of the first operational amplifier module is respectively connected with the first end of the detection resistor RSENSE and the bus to be detected, the output end of the first operational amplifier module is connected with the input end of the following module, the output end of the following module is respectively connected with the output end of the bias current module 2, and the first end of the conversion resistor R2 is connected with the input end of the difference detection module 3;
the first operational amplifier module is used for converting the first voltage signal into a corresponding second current signal, and the second current signal is in linear correlation with the first voltage signal;
the following module is used for converting the second current signal into a corresponding first current signal, the first current signal and the second current signal are in linear correlation, the direction of the second current signal is consistent with the direction of the first current signal, and the direction of the first current signal is consistent with the direction of the output current of the bias current module 2.
Specifically, the conversion module 1 includes a first operational amplifier module and a following module; the first operational amplifier module converts the first voltage signal into a corresponding second current signal, and before conversion, the first operational amplifier module can amplify and/or enhance the first voltage signal so as to obtain a more stable and reliable accurate signal later, and the first operational amplifier module converts the first voltage signal into the corresponding second current signal in consideration of the need of transmission operation of the follow-up module; the following module is mainly used for transmitting current, and can process the second current signal into the first current signal through operations such as amplification, and the first current signal and the second current signal are in linear correlation and can be equal or unequal. It will be appreciated that the following module simply amplifies and/or transmits the current, and does not change the direction of the current, so that the direction of the second current signal coincides with the direction of the first current signal and with the direction of the output current of the bias current module 2.
It can be understood that the first operational amplifier module may be implemented by selecting a circuit structure with an operational amplifier and a resistor combined, the following module may be implemented by selecting a current mirror structure formed by MOS transistors (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-Oxide semiconductor field effect transistors), and the application is not limited in particular herein, and may be adjusted according to practical application requirements.
Specifically, the conversion module 1 includes a first operational amplifier module and a following module; the first operational amplifier module converts the first voltage signal into a corresponding second current signal; the following module is mainly used for transmitting current and can process the second current signal into the first current signal through operations such as amplification and the like; the function of the conversion module 1 is effectively realized through the first operational amplifier module and the following module, so that the circuit structure of the conversion module 1 is clearer and more definite, and the amplifying and/or enhancing effects on signals can be increased, so that the follow-up conversion resistor R2 and the difference detection module 3 are accurately realized, and the reliability and the safety of a current detection circuit are ensured.
As a preferred embodiment, the first op-amp module includes: a first operational amplifier 21, an operational amplifier switch NM3, and a voltage dividing resistor R1;
The non-inverting input end of the first operational amplifier 21 is respectively connected with the first end of the detection resistor RSENSE and the bus to be detected, the output end of the first operational amplifier 21 is respectively connected with the inverting input end of the first operational amplifier 21, the first end of the operational amplifier switch NM3 is connected with the first end of the voltage dividing resistor R1, the second end of the voltage dividing resistor R1 is grounded, and the second end of the operational amplifier switch NM3 is connected with the input end of the following module.
Specifically, the first operational amplifier module includes a first operational amplifier 21, an operational amplifier switch NM3, and a voltage dividing resistor R1; the whole circuit forms a virtual short of the first operational amplifier 21, the voltage of the inverting input terminal of the first operational amplifier 21 is equal to the voltage of the non-inverting input terminal, the voltage of the first terminal of the voltage dividing resistor R1 is also equal to the voltage of the non-inverting input terminal, namely, a first voltage signal, due to the fact that the inverting input terminal of the first operational amplifier 21 is connected with the first terminal of the voltage dividing resistor R1, meanwhile, the first voltage signal is converted into a current signal due to the characteristic of the voltage dividing resistor R1, and when the operational amplifier switch NM3 is turned on, the current of the first terminal and the current of the second terminal are equal, so that the current flowing through the voltage dividing resistor R1 is equal to the value of the current input to the following module, namely, a second current signal. The first operational amplifier 21 may also have a certain signal gain for the first voltage signal, so as to ensure the accuracy and reliability of the subsequent signal.
It will be appreciated that, for the specific types of the first operational amplifier 21, the operational amplifier switch NM3 and the voltage dividing resistor R1, the parameter values, implementation and the like are not limited herein, and may be selected according to practical application requirements, the operational amplifier switch NM3 may select switching devices such as N-type MOS transistors or triodes, and the voltage dividing resistor R1 may select fixed resistors or adjustable resistors.
Specifically, the first operational amplifier module includes a first operational amplifier 21, an operational amplifier switch NM3, and a voltage dividing resistor R1; the function of the first operational amplifier module is effectively realized by utilizing the virtual short of the first operational amplifier 21 and the conduction of the operational amplifier switch NM3, the circuit structure is simple, the implementation is easy, the application is convenient, the cost of the adopted devices is low, the integral implementation of the current detection circuit is facilitated, the gain of the first voltage signal can be realized by the operational amplifier, the accurate implementation of the subsequent circuit is facilitated, and the safety and the reliability of the whole current detection circuit are ensured.
As a preferred embodiment, the following module comprises: a first PMOSPM1, a second PMOSPM2, a first nmosm m1 and a second nmosm m2;
the first end of the first PMOSPM1 is connected with a power supply, the second end is respectively connected with the control end of the first PMOSPM1 and the second end of the operational amplifier switch NM3, the control end of the first PMOSPM1 is also connected with the control end of the second PMOSPM2, the first end of the second PMOSPM2 is connected with the power supply, the second end is respectively connected with the first end of the first NMOSNM1 and the control end of the first NMOSNM1, the second end of the first NMOSNM1 is grounded, the control end of the first NMOSNM1 is also connected with the control end of the second NMOSNM2, the first end of the second NMOSNM2 serves as the output end of the following module, and the second end is grounded.
Specifically, the following module includes a first PMOSPM1, a second PMOSPM2, a first nmosm m1 and a second nmosm 2; the first PMOSPM1 and the second PMOSPM2 form a pair of current mirrors, and the first NMOSNM1 and the second NMOSNM2 form a pair of current mirrors; in consideration of the effect of the following module on current transmission, in order to ensure the stable direction of the current, two pairs of current mirrors, also called mirror constant current sources, are arranged, the output current of the current mirrors is copied to the input current according to a certain proportion, the current mirrors have relatively high output resistance, the output current is kept constant regardless of the load condition, and the current transmission is effectively realized. Meanwhile, the amplification factor can be adjusted by adjusting the mirror proportion of the current mirror, so that the amplification of the second current signal is realized; the two pairs of current mirrors can be used for effectively amplifying the second current signal, and the whole current detection circuit can be realized under the condition that the first voltage signal is very small.
It can be understood that, for the specific types of the first PMOSPM1, the second PMOSPM2, the first nmosm 1, the second nmosm 2, the parameter selection and implementation manner, etc. the present application is not limited in particular herein, and may be selected according to practical application requirements, and the adjustment of the mirror image proportion of the current mirror may be implemented by adjusting the width-to-length ratio of the four MOS transistors, or may be implemented in other manners.
Specifically, the following module is realized through two pairs of current mirrors consisting of the first PMOSPM1, the second PMOSPM2, the first NMOSNM1 and the second NMOSNM2, the circuit structure is simple, the implementation is easy, the application is convenient and fast, the function of the following module can be effectively realized, the current mirror can ensure the accuracy and the stability of current transmission, and meanwhile, the amplification of a current signal can be realized by adjusting the mirror image proportion, so that the accurate realization of the whole current detection circuit is facilitated, and the safety and the reliability of the current detection circuit are ensured.
As a preferred embodiment, the bias current module 2 includes: a reference current source Iref and a bias block 24; the input end of the reference current source Iref is connected with the bias module 24, the output end of the reference current source Iref is respectively connected with the output end of the conversion module 1, and the first end of the conversion resistor R2 is connected with the input end of the difference detection module 3;
the reference current source Iref is used to output a fixed bias current in cooperation with the bias module 24.
Specifically, the bias current module 2 includes a reference current source Iref and a bias module 24; the bias module 24 is mainly used for providing a fixed working point and a reference current, and is matched with the reference current source Iref to output a fixed bias current so as to facilitate the normal operation of the conversion module 1 and the conversion resistor R2; the specific value and implementation mode of the output bias current are not particularly limited herein, and can be adjusted manually; the specific type and implementation of the bias block 24 and the reference current source Iref are not particularly limited herein.
Specifically, the bias current module 2 includes a reference current source Iref and a bias module 24; the fixed bias current is provided for the current detection circuit, so that the conversion operation between voltage and current is conveniently carried out by the conversion module 1 and the conversion resistor R2, the fixed reference current is beneficial to accurately analyzing the whole circuit, the circuit structure is simple, the implementation is easy, and the function of the bias current module 2 can be effectively realized.
As a preferred embodiment, further comprising: the second operational amplifier module; the input end of the second operational amplifier module is respectively connected with the output end of the bias current module 2, the first end of the conversion resistor R2 is connected with the output end of the conversion module 1, and the output end of the second operational amplifier module is connected with the input end of the difference detection module 3;
the second operational amplifier module is used for improving the driving capability of the second voltage signal.
Considering that the application scene of the whole current detection circuit is usually low-voltage power supply, the situation that the driving capability of the second voltage signal is lower may exist, a second operational amplifier module is additionally arranged in front of the difference detection module 3 and used for improving the driving capability of the second voltage signal, and the voltage signal with improved driving capability is output to the difference detection module 3 again, so that the difference detection module 3 can be effectively realized.
It can be understood that the specific implementation manner of the second operational amplifier module has various choices, and devices such as an operational amplifier or related circuit structures can be selected for implementation, so that the application is not particularly limited herein, and can be selected according to actual application requirements. Specifically, when the second operational amplifier module is implemented by using the second operational amplifier 22, the non-inverting input terminal of the second operational amplifier 22 is used as the input terminal of the second operational amplifier module, and the output terminal of the second operational amplifier 22 is connected to the inverting input terminal of the second operational amplifier 22 and the input terminal of the difference detection module 3, respectively.
Considering that the application scene of the whole current detection circuit is usually low-voltage power supply, the condition that the driving capability of the second voltage signal is lower may exist, a second operational amplifier module is additionally arranged in front of the difference detection module 3, the driving capability of the second voltage signal is improved, the effective implementation of the difference detection module 3 is ensured, the accuracy and the reliability of the difference detection module 3 can be further improved by improving the driving capability of the signal, the accurate implementation of the whole current detection circuit is ensured, and the accuracy and the reliability of the whole current detection circuit are further ensured.
As a preferred embodiment, the difference detection module 3 includes: a capacitor Css, a charging module, a discharging module and a differential amplifier 25;
The input end of the charging module is respectively connected with the output end of the conversion module 1, the output end of the bias current module 2 and the first end of the conversion resistor R2, the first output end of the charging module is respectively connected with the first end of the capacitor Css and the second input end of the differential amplifier 25, the second output end of the charging module is connected with the first input end of the differential amplifier 25, the second end of the capacitor Css is grounded, the discharging module is respectively connected with the first end of the capacitor Css and the second input end of the differential amplifier 25, and the output end of the differential amplifier 25 serves as the output end of the current detection circuit;
the charging module is used for charging the capacitor Css when the second voltage signal is lower than a preset value;
the discharging module is used for discharging the capacitor Css when the second voltage signal is higher than a preset value.
Considering that the current detection process needs to accurately monitor the current change process, the difference detection module 3 realizes accurate detection of the jump of the second voltage signal through the charge-discharge process of the capacitor Css, finally outputs a third voltage signal corresponding to the second voltage signal based on the jump signal, integrally plays a role of amplifying the signal and enhancing the signal, and ensures that small jump can be detected through the further amplified jump signal through the differential amplifier 25, and compared with the second voltage signal, the third voltage signal is easier to analyze, thereby being beneficial to the subsequent analysis of the current to be detected based on the third voltage signal and realizing the current detection process.
In the initial stage of the difference detection module 3, an initial setup time is required, in which the capacitor Css is charged first, and then after entering a working state, the voltages at two ends of the capacitor Css are stabilized near a preset voltage value; when the second voltage signal is a smaller voltage value, the voltage at the two ends of the capacitor Css needs to be reduced from a preset value to a voltage value corresponding to the second voltage signal, the capacitor Css can enter a discharging process, and is discharged through a discharging module, and when the second voltage signal jumps to a larger voltage value, the first input end of the differential amplifier 25 can respond instantly and is stabilized to the voltage value corresponding to the second voltage signal; the second input end is connected with the first end of the capacitor Css, so that the voltage at the two ends of the capacitor Css cannot be suddenly changed, a charging process is required, and the capacitor Css is charged through the charging module until the voltage value corresponding to the current second voltage signal is reached; because of the difference in time between the two voltage changes, the first input terminal can be considered to be a real-time response signal change, and the second input terminal is a voltage signal similar to a direct current state, and thus the jump signal of the second voltage signal can be accurately detected by the differential amplifier 25 of the subsequent stage, and the output of the corresponding third voltage signal can be generated.
Specifically, the specific types and implementation manners of the capacitor Css, the charging module, the discharging module, the differential amplifier 25, and the like are not particularly limited herein, and various parameters of the capacitor Css are also selected, the capacitor Css is not particularly limited herein, and can be selected according to actual application requirements, and the capacitor Css is generally selected to have a polar capacitor Css or can be selected to have a non-polar capacitor Css; the charging module can be realized by an RC charging circuit or other circuit structures; the discharging module can be realized through a structure of grounding a fixed resistor, and other modes can be selected; the differential amplifier 25 may be implemented as a direct selection comparator or may be of another type.
Specifically, the difference detection module 3 includes a capacitor Css, a charging module, a discharging module, and a differential amplifier 25; the amplification and accurate detection of the jump signal are realized through the charge and discharge process of the capacitor Css, the effect of the difference detection module 3 is effectively realized, the circuit structure is simple, the implementation is easy, the application is convenient, the detection process of the current is further realized through the jump signal of the detection voltage, the detection process of the current can also be realized under the condition of low-voltage power supply, so that the follow-up related staff can effectively judge the current state under the condition of low-voltage power supply, the application range of the current detection technology is expanded, and the further development of the power technology is facilitated.
As a preferred embodiment, the charging module includes: the first unidirectional conduction module D1, the second unidirectional conduction module D2 and the charging resistor R5;
the positive pole of first unidirectional conduction module D1 is connected with the output of conversion module 1 respectively, the output of bias current module 2 and the first end of converting resistor R2, and the negative pole of first unidirectional conduction module D1 is connected with the positive pole of second unidirectional conduction module D2 and the first input of differential amplifier 25 respectively, and the negative pole of second unidirectional conduction module D2 is connected with the first end of charging resistor R5, and the second end of charging resistor R5 is connected with the first end of electric capacity Css and the second input of differential amplifier 25 respectively.
Considering that the voltage at the first end of the capacitor Css fluctuates in the charging and discharging process of the capacitor Css, in order to avoid the situation that current flows backwards possibly caused by the voltage fluctuation at the first end of the capacitor Css, meanwhile, in order to avoid the capacitor Css discharging through the charging resistor R5, the charging module is provided with a first unidirectional conduction module D1 and a second unidirectional conduction module D2, the current flowing direction in the charging process is regulated, and the charging resistor R5 can play a role of voltage division and current limitation, so that a circuit can be protected better; meanwhile, the voltage at the first end of the capacitor Css can not drop to a very low state after discharging due to the arrangement of the unidirectional conduction module, so that the finally output signal amplitude is prevented from being too large, the capacitor Css can be effectively protected, and the whole circuit is protected.
It can be understood that, for the specific types of the first unidirectional conduction module D1, the second unidirectional conduction module D2, the charging resistor R5, the parameter selection and implementation manner are not particularly limited herein, and may be selected according to the actual application requirements and the specific value of the capacitor Css; the first unidirectional conduction module D1 and the second unidirectional conduction module D2 can be realized by selecting diodes, other unidirectional conduction devices such as unidirectional silicon can also be adopted, the charging resistor R5 can be selected to be a fixed resistor, and the method is low in cost and easy to realize.
Specifically, the charging module comprises a first unidirectional conduction module D1, a second unidirectional conduction module D2 and a charging resistor R5; the first unidirectional conduction module D1 and the second unidirectional conduction module D2 prescribe the current flowing direction in the charging process, so that the condition of current backflow is avoided, and the charging resistor R5 can better protect a circuit; the circuit structure is simple and easy to realize, the cost of the used devices is low, the effect of the charging module is effectively realized, the accurate realization of the difference detection module 3 is ensured, and the safety and reliability of the whole current detection circuit are improved.
As a preferred embodiment, the discharge module includes: the third unidirectional conduction module D3, the first discharge resistor R3 and the second discharge resistor R4;
The first end of the first discharging resistor R3 is grounded, the second end is respectively connected with the negative electrode of the first unidirectional conduction module D1, the positive electrode of the second unidirectional conduction module D2 and the negative electrode of the third unidirectional conduction module D3, the positive electrode of the third unidirectional conduction module D3 is respectively connected with the first end of the capacitor Css, the second input end of the differential amplifier 25 is connected with the first end of the second discharging resistor R4, and the second end of the second discharging resistor R4 is grounded.
Considering that the voltage at the first end of the capacitor Css fluctuates during the charging and discharging process of the capacitor Css, in order to avoid the situation that current flows backwards possibly caused by the voltage fluctuation at the first end of the capacitor Css, the discharging module is provided with a third unidirectional conduction module D3 for avoiding discharging the capacitor Css through the charging resistor R5, the current flowing direction during the discharging process is regulated, the discharging of the capacitor Css through the charging resistor R5 is avoided, the first discharging resistor R3 and the second discharging resistor R4 can play a role in voltage division and current limiting, and a better protection circuit can be realized; meanwhile, the voltage at the first end of the capacitor Css can not drop to a very low state after discharging due to the arrangement of the unidirectional conduction module, so that the finally output signal amplitude is prevented from being too large, the capacitor Css can be effectively protected, and the whole circuit is protected.
It can be understood that, for the third unidirectional conduction module D3, specific types of the first discharging resistor R3 and the second discharging resistor R4, parameter selection, implementation manner, and the like are not particularly limited herein, and may be selected according to actual application requirements and specific values of the capacitor Css; the third unidirectional conduction module D3 can be realized by selecting a diode, other unidirectional conduction devices such as unidirectional silicon can also be adopted, the first discharging resistor R3 and the second discharging resistor R4 can be fixed resistors, and the method is low in cost and easy to realize.
Specifically, the discharging module comprises a third unidirectional conduction module D3, a first discharging resistor R3 and a second discharging resistor R4; the third unidirectional conduction module D3 prescribes the current flowing direction in the discharging process, so that the discharging process is avoided through the charging resistor R5, and the first discharging resistor R3 and the second discharging resistor R4 can be better protected; the circuit structure is simple and easy to realize, the cost of the used devices is low, the effect of the discharging module is effectively realized, the accurate realization of the difference detection module 3 is ensured, and the safety and reliability of the whole current detection circuit are improved.
As shown in fig. 2, IBUS represents a current to be detected, VBUSN represents a first voltage signal, and TXD is an output terminal of the current detection circuit.
As a specific embodiment, the current to be detected flows to the ground through the sense resistor RSENSE and is converted into the first voltage signal VBUSN. Is sampled and converted into a first current signal I1 by a first operational amplifier 21, and. When the mirror image ratio of the current mirror is 1:1, the current mirror relationship is adopted to make +.>Current I flowing through the switching resistor R2 5 The method comprises the following steps: />The method comprises the steps of carrying out a first treatment on the surface of the The voltage at the first end of the conversion resistor R2, i.e. the second voltage signal V2 is:. The second voltage signal is generated by the second operational amplifier moduleAnd a voltage signal V3 after high driving capability.
Taking the MBUS bus as an example, when receiving data 0, the current IBUS is IMDC, and when receiving data 1, the current IBUS becomes IMDC+ICS, which will generateCorresponding->. When this jump signal occurs, the difference detection module 3 is able to detect and generate a corresponding output.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a difference detection module in a current detection circuit according to the present invention; referring to fig. 4, fig. 4 is a schematic signal waveform diagram of a difference detection module according to the present invention;
taking the MBUS bus as an example, the difference detection module 3 may convert a jump signal into an output rail-to-rail digital signal. When the module starts to work, a set-up time is needed to charge the capacitor Css, and the voltage VCS at the first end of the capacitor Css can be stabilized to be fluctuated at a certain middle level; when the voltage V3 at the input end of the differential detection module 3 is at a lower level, due to the presence of the first unidirectional conduction module D1, the second unidirectional conduction module D2, and the third unidirectional conduction module D3, the voltage VCS at the first end of the capacitor Css will be discharged through R4, and the capacitance value of the capacitor Css is larger, the resistance value of the second discharge resistor R4 is also larger, the voltage drop at the end of the duration of this stage is smaller, the voltage V4 at the first input end of the differential amplifier 25 is discharged through R1, the resistance of R1 is smaller, the node capacitance is smaller, the discharge speed is very fast, and the discharge is always clamped to the voltage that is relatively larger of V3-Vd and VCS-Vd. When the voltage V3 at the input of the differential detection module 3 jumps from a lower level to a higher level, the voltage V4 node at the first input of the differential amplifier 25 can instantaneously respond and stabilize at the V3-Vd voltage, while the voltage VCS node at the first terminal of the capacitor Css needs to be charged due to the presence of the capacitor Css, and the voltage rise at the end of this phase duration is relatively small.
Because of the difference in time between the two voltage changes, one end is considered to be a real-time response signal change, and the other end is considered to be a level similar to a direct current state, and at the intermediate level of the jump signal, the voltage jump signal can be detected by the later comparator, and a corresponding output signal TXD is generated.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a current detecting device according to the present application.
In order to solve the above technical problems, the present application further provides a current detection device, which includes a bus to be detected 32 and a current detection circuit 31 as described above, where the bus to be detected 32 is connected to the current detection circuit 31.
It will be appreciated that the application is not particularly limited herein as to the particular type and implementation of the bus 32 to be tested, but may be a BUSN in an MBUS bus, or may be another type of bus; there are also various options for the connection between the bus 32 to be detected and the current detection circuit 31, and the present application is not limited herein, and may be selected according to practical application requirements.
For an introduction of the current detection device provided by the present application, please refer to the embodiment of the current detection circuit, and the description of the present application is omitted herein.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A current detection circuit, comprising: the device comprises a detection resistor, a conversion module, a bias current module, a conversion resistor and a difference detection module;
the first end of the detection resistor is respectively connected with the input end of the conversion module and the bus to be detected, the second end of the detection resistor is grounded, the output end of the conversion module is respectively connected with the output end of the bias current module, the first end of the conversion resistor is connected with the input end of the difference detection module, the second end of the conversion resistor is grounded, and the output end of the difference detection module is used as the output end of the current detection circuit;
the detection resistor is used for converting the current signal of the bus to be detected into a first voltage signal;
the conversion module is used for converting the first voltage signal into a corresponding first current signal, the first current signal is in linear correlation with the first voltage signal, and the direction of the first current signal is consistent with the direction of the output current of the bias current module;
the conversion resistor is used for converting the first current signal into a corresponding second voltage signal;
the difference detection module is used for detecting a jump signal of the second voltage signal and outputting a third voltage signal corresponding to the second voltage signal based on the jump signal of the second voltage signal;
The difference detection module comprises: the device comprises a capacitor, a charging module, a discharging module and a differential amplifier;
the input end of the charging module is respectively connected with the output end of the conversion module, the output end of the bias current module is connected with the first end of the conversion resistor, the first output end of the charging module is respectively connected with the first end of the capacitor and the second input end of the differential amplifier, the second output end of the charging module is connected with the first input end of the differential amplifier, the second end of the capacitor is grounded, the discharging module is respectively connected with the first end of the capacitor and the second input end of the differential amplifier, and the output end of the differential amplifier is used as the output end of the current detection circuit;
the charging module is used for charging the capacitor when the second voltage signal is lower than a preset value;
the discharging module is used for discharging the capacitor when the second voltage signal is higher than a preset value;
the charging module includes: the charging device comprises a first unidirectional conduction module, a second unidirectional conduction module and a charging resistor;
the positive electrode of the first unidirectional conduction module is respectively connected with the output end of the conversion module, the output end of the bias current module is connected with the first end of the conversion resistor, the negative electrode of the first unidirectional conduction module is respectively connected with the positive electrode of the second unidirectional conduction module and the first input end of the differential amplifier, the negative electrode of the second unidirectional conduction module is connected with the first end of the charging resistor, and the second end of the charging resistor is respectively connected with the first end of the capacitor and the second input end of the differential amplifier;
The discharge module includes: the third unidirectional conduction module comprises a first discharge resistor and a second discharge resistor;
the first end of the first discharging resistor is grounded, the second end of the first discharging resistor is respectively connected with the negative electrode of the first unidirectional conduction module, the positive electrode of the second unidirectional conduction module is connected with the negative electrode of the third unidirectional conduction module, the positive electrode of the third unidirectional conduction module is respectively connected with the first end of the capacitor, the second input end of the differential amplifier is connected with the first end of the second discharging resistor, and the second end of the second discharging resistor is grounded;
when the difference detection module starts to work, the capacitor is charged through an establishment time, and the voltage of the first end of the capacitor is stabilized to be fluctuated at an intermediate level; when the voltage of the input end of the differential amplifier is at a low level, due to the existence of the first unidirectional conduction module, the second unidirectional conduction module and the third unidirectional conduction module, the voltage of the first end of the capacitor is discharged through the second discharge resistor, the capacitance value of the capacitor is larger, the resistance value of the second discharge resistor is larger, the voltage drop is smaller when the discharge is finished, the voltage of the first input end of the differential amplifier is discharged through the first discharge resistor, and the voltage of the first input end of the differential amplifier is clamped to a larger voltage position of a fifth voltage and a sixth voltage after the discharge, wherein the fifth voltage is the difference value between the voltage of the input end of the differential amplifier and the voltage drop of the third unidirectional conduction module, and the sixth voltage is the difference value between the voltage of the first end of the capacitor and the voltage drop of the third unidirectional conduction module; when the voltage of the input end of the difference detection module jumps from low level to high level, the voltage of the first input end of the differential amplifier instantaneously responds and is stabilized at the fifth voltage, and the voltage of the first end of the capacitor needs a certain charging time due to the existence of the capacitor;
Because the voltage of the first input end of the differential amplifier and the jump of the voltage of the first end of the capacitor have time difference, the voltage of the first input end of the differential amplifier is real-time response signal change, the voltage of the first end of the capacitor is similar to the level of a direct current state, and at the middle level of the jump signal, a later comparator detects the voltage jump signal according to the difference between the voltage of the first input end of the differential amplifier and the voltage of the first end of the capacitor and generates a corresponding output signal.
2. The current detection circuit of claim 1, wherein the conversion module comprises a first op-amp module and a follower module;
the input end of the first operational amplifier module is respectively connected with the first end of the detection resistor and the bus to be detected, the output end of the first operational amplifier module is connected with the input end of the following module, the output end of the following module is respectively connected with the output end of the bias current module, and the first end of the conversion resistor is connected with the input end of the difference detection module;
the first operational amplifier module is used for converting the first voltage signal into a corresponding second current signal, and the second current signal is in linear correlation with the first voltage signal;
The following module is used for converting the second current signal into a corresponding first current signal, the first current signal is in linear correlation with the second current signal, the direction of the second current signal is consistent with the direction of the first current signal, and the direction of the first current signal is consistent with the direction of the output current of the bias current module.
3. The current detection circuit of claim 2, wherein the first op-amp module comprises: the first operational amplifier, the operational amplifier switch and the voltage dividing resistor;
the non-inverting input end of the first operational amplifier is connected with the first end of the detection resistor and the bus to be detected respectively, the output end of the first operational amplifier is connected with the inverting input end of the first operational amplifier respectively, the first end of the operational amplifier switch is connected with the first end of the voltage dividing resistor, the second end of the voltage dividing resistor is grounded, and the second end of the operational amplifier switch is connected with the input end of the following module.
4. The current detection circuit of claim 3, wherein the follower module comprises: a first PMOS, a second PMOS, a first NMOS and a second NMOS;
the first end of the first PMOS is connected with a power supply, the second end of the first PMOS is connected with the control end of the first PMOS and the second end of the operational amplifier switch respectively, the control end of the first PMOS is also connected with the control end of the second PMOS, the first end of the second PMOS is connected with the power supply, the second end of the second PMOS is connected with the first end of the first NMOS and the control end of the first NMOS respectively, the second end of the first NMOS is grounded, the control end of the first NMOS is also connected with the control end of the second NMOS, and the first end of the second NMOS is used as the output end of the following module and the second end of the second NMOS is grounded.
5. The current detection circuit of claim 1, wherein the bias current module comprises: a reference current source and a bias module; the input end of the reference current source is connected with the bias module, the output end of the reference current source is respectively connected with the output end of the conversion module, and the first end of the conversion resistor is connected with the input end of the difference detection module;
the reference current source is used for outputting fixed bias current in cooperation with the bias module.
6. The current detection circuit of claim 1, further comprising: the second operational amplifier module; the input end of the second operational amplifier module is respectively connected with the output end of the bias current module, the first end of the conversion resistor is connected with the output end of the conversion module, and the output end of the second operational amplifier module is connected with the input end of the difference detection module;
the second operational amplifier module is used for improving the driving capability of the second voltage signal.
7. A current detecting device, characterized by comprising a bus to be detected and a current detecting circuit according to any one of claims 1 to 6, the bus to be detected being connected to the current detecting circuit.
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