Current detection circuit and detection device

Abstract

The embodiment of the invention discloses a current detection circuit and a detection device. The current detection circuit comprises a power input end, a current acquisition module, a detection module, a signal output control module and a signal output end, the power input end and the first end of the current acquisition module are both connected with the first end of the to-be-detected device, the second end of the current acquisition module and the second end of the to-be-detected device are both connected with the first end of the signal output control module, and the third end of the current acquisition module is connected with the first end of the detection module. The second end of the detection module is connected with the second end of the signal output control module, and the third end of the signal output control module is connected with the signal output end. According to the scheme, rapid and accurate current detection can be carried out on detection devices with different detection current standards by presetting different reference voltages through the detection module.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of device detection technology, and in particular to a current detection circuit and a detection device. Background Art

[0002] With the rapid upgrading of the electronic market, liquid crystal display products have become the mainstream of consumption, with increasing demand and output. Liquid Crystal Module (LCM) is an important component of liquid crystal display. With the development of electronic technology, the requirements for current and voltage specifications of liquid crystal display modules are getting higher and higher, such as the need to add current detection to industrial control and vehicle-mounted models. However, at present, the current value of industrial control and vehicle-mounted models is monitored with a white screen, and the monitoring current values ​​set for different industrial control and vehicle-mounted models are different. As a result, the current detection process for industrial control and vehicle-mounted models is complicated and inefficient. Summary of the invention

[0003] The embodiments of the present invention provide a current detection circuit and a detection device to realize fast and accurate current detection of detection devices with different detection current standards.

[0004] In a first aspect, an embodiment of the present invention provides a current detection circuit, which includes a power input terminal, a current acquisition module, a detection module, a signal output control module and a signal output terminal;

[0005] The power input terminal and the first terminal of the current acquisition module are both connected to the first terminal of the device to be detected, the second terminal of the current acquisition module and the second terminal of the device to be detected are both connected to the first terminal of the signal output control module, the third terminal of the current acquisition module is connected to the first terminal of the detection module, the second terminal of the detection module is connected to the second terminal of the signal output control module, and the third terminal of the signal output control module is connected to the signal output terminal;

[0006] The power input terminal can transmit electric energy to the device to be detected, and the current acquisition module can generate a current detection signal according to the current flowing through the device to be detected; the detection module can preset a reference voltage, and detect the current detection signal according to the preset reference voltage, and output a detection result signal; the signal output control module can control the signal output terminal to reflect the detection result through the output voltage according to the detection result signal.

[0007] Optionally, the current acquisition module includes a first voltage-dividing resistor, a second voltage-dividing resistor, a third voltage-dividing resistor, a fourth voltage-dividing resistor and a first operational amplifier;

[0008] The first end of the first voltage-dividing resistor serves as the first end of the current acquisition module, the second end of the first voltage-dividing resistor and the first end of the second voltage-dividing resistor are both connected to the positive input terminal of the first operational amplifier, the second end of the second voltage-dividing resistor is grounded, the first end of the third voltage-dividing resistor serves as the second end of the current acquisition module, the second end of the third voltage-dividing resistor and the first end of the fourth voltage-dividing resistor are both connected to the negative input terminal of the first operational amplifier, and the second end of the fourth voltage-dividing resistor is connected to the output terminal of the first operational amplifier and serves as the third end of the current acquisition module.

[0009] Optionally, the resistance value of the first voltage-dividing resistor is equal to the resistance value of the third voltage-dividing resistor, and the resistance value of the second voltage-dividing resistor is equal to the resistance value of the fourth voltage-dividing resistor.

[0010] Optionally, the detection module includes a detection current setting unit and a detection unit;

[0011] The negative input terminal of the detection unit serves as the first terminal of the detection module, the detection current setting unit is connected to the positive input terminal of the detection unit, and the output terminal of the detection unit serves as the second terminal of the detection module;

[0012] The detection current setting unit can set a reference voltage of the detection unit, and the detection unit can detect the current detection signal according to the reference voltage and output the detection result signal.

[0013] Optionally, the detection current setting unit includes a sliding rheostat and a fifth voltage-dividing resistor;

[0014] The first ends of the sliding rheostat and the fifth voltage-dividing resistor are both connected to the positive input end of the detection unit, and the second end of the fifth voltage-dividing resistor is grounded.

[0015] Optionally, the detection current setting unit includes a control chip and a digital-to-analog converter;

[0016] The control chip is connected to the digital-to-analog converter, and the digital-to-analog converter is connected to the positive input terminal of the detection unit.

[0017] Optionally, the detection unit includes a second operational amplifier;

[0018] The negative input terminal of the second operational amplifier serves as the negative input terminal of the detection unit, the positive input terminal of the second operational amplifier serves as the positive input terminal of the detection unit, and the output terminal of the second operational amplifier serves as the output terminal of the detection unit.

[0019] Optionally, the signal output control module includes a switch unit, a first current limiting unit and a second current limiting unit;

[0020] The first end of the first current limiting unit serves as the first end of the signal output control module, the second end of the first current limiting unit is connected to the first end of the switch unit, the control end of the switch unit serves as the second end of the signal output control module, the second end of the switch unit is connected to the first end of the second current limiting unit and serves as the third end of the signal output control module, and the second end of the second current limiting unit is grounded.

[0021] Optionally, the switch unit includes an N-type MOS tube, the first current limiting unit includes a first current limiting resistor, and the second current limiting unit includes a second current limiting resistor;

[0022] The first end of the first current limiting resistor serves as the first end of the first current limiting unit, and the second end of the first current limiting resistor serves as the second end of the first current limiting unit;

[0023] The first end of the second current limiting resistor serves as the first end of the second current limiting unit, and the second end of the second current limiting resistor serves as the second end of the second current limiting unit;

[0024] The gate of the N-type MOS tube serves as the control end of the switch unit, the first electrode of the N-type MOS tube serves as the first end of the switch unit, and the second electrode of the N-type MOS tube serves as the second end of the switch unit.

[0025] In a second aspect, an embodiment of the present invention further provides a detection device, which includes the current detection circuit provided by any embodiment of the present invention.

[0026] The embodiment of the present invention transmits electric energy to the device to be detected through the power input terminal, the current acquisition module generates a current detection signal according to the current flowing through the device to be detected, and the detection module detects the current detection signal based on a preset reference voltage as a standard, and can output a detection result signal carrying the detection result; the signal output control module can control the signal output terminal to reflect the detection result through the output voltage according to the detection result signal. Therefore, this solution can perform fast and accurate current detection on detection devices with different detection current standards by presetting different reference voltages in the detection module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1A schematic diagram of the structure of a current detection circuit provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of another current detection circuit provided by an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of the structure of another current detection circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are capable of distinguishing similar objects, but not necessarily capable of describing a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] Figure 1 A schematic diagram of a current detection circuit provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the current detection circuit includes a power input terminal 110, a current acquisition module 120, a detection module 130, a signal output control module 140 and a signal output terminal 150;

[0034] The power input terminal 110 and the first terminal of the current acquisition module 120 are both connected to the first terminal of the device to be detected 210, the second terminal of the current acquisition module 120 and the second terminal of the device to be detected 210 are both connected to the first terminal of the signal output control module 140, the third terminal of the current acquisition module 120 is connected to the first terminal of the detection module 130, the second terminal of the detection module 130 is connected to the second terminal of the signal output control module 140, and the third terminal of the signal output control module 140 is connected to the signal output terminal 150;

[0035] The power input terminal 110 can transmit electric energy to the device to be detected 210, and the current acquisition module 120 can generate a current detection signal according to the current flowing through the device to be detected 210; the detection module 130 can preset a reference voltage, and detect the current detection signal according to the preset reference voltage, and output a detection result signal; the signal output control module 140 can control the signal output terminal 150 to reflect the detection result through the output voltage according to the detection result signal.

[0036] Among them, the power input terminal 110 is the power supply terminal of the current detection circuit, and the external power supply or other power supply device can supply power to the device to be detected 210 through the power input terminal 110. The current acquisition module 120 can obtain the current flowing through the device to be detected 210, and generate a current detection signal according to the current flowing through the device to be detected 210. The current detection signal is a voltage signal that can reflect the magnitude of the current flowing through the device to be detected 210, and the magnitude of the current detection signal is in a certain multiple relationship with the magnitude of the current flowing through the device to be detected 210. The detection module 130 can set a reference voltage according to the current standard of the detection device, and detect the range of the current detection signal based on the reference voltage as the standard to determine the magnitude between the current detection signal and the reference voltage, and then indirectly determine the magnitude relationship between the current flowing through the device to be detected 210 and the reference voltage; after judging the range of the current detection signal, the detection module 130 will generate a detection result signal carrying the detection result. The detection result signal includes a first detection result signal and a second detection result signal. The signal output control module 140 can control the signal output terminal 150 to output a low voltage according to the first detection result signal to reflect that the current flowing through the device to be detected 210 is greater than the reference voltage; the signal output control module 140 can control the signal output terminal 150 to output a high voltage according to the second detection result signal to reflect that the current flowing through the device to be detected 210 is less than the reference voltage.

[0037] According to the above connection relationship, the working process of the current detection circuit is described: the power input terminal 110 transmits electric energy to the device to be detected 210, the current acquisition module 120 can generate a current detection signal according to the current flowing through the device to be detected 210, and the detection module 130 detects the current detection signal according to the preset reference voltage. If the detection module 130 outputs a first detection result signal, the signal output control module 140 controls the signal output terminal 150 to output a low voltage according to the first detection result signal, reflecting the detection result that the current detection signal is greater than the reference voltage, that is, the current flowing through the device to be detected 210 is greater than its current standard; if the detection module 130 outputs a second detection result signal, the signal output control module 140 controls the signal output terminal 150 to output a high voltage according to the second detection result signal, reflecting the detection result that the current detection signal is less than the reference voltage, that is, the current flowing through the device to be detected 210 is less than its current standard.

[0038] In the embodiment of the present invention, electric energy is transmitted to the device to be detected 210 through the power input terminal 110, the current acquisition module 120 generates a current detection signal according to the current flowing through the device to be detected 210, and the detection module 130 detects the current detection signal with a preset reference voltage as the standard, and can output a detection result signal carrying the detection result; the signal output control module 140 can control the signal output terminal 150 to reflect the detection result through the output voltage according to the detection result signal. Therefore, this solution can perform fast and accurate current detection on detection devices with different detection current standards by presetting different reference voltages in the detection module 130.

[0039] Based on the above embodiment, optionally, Figure 2 FIG. 1 is a schematic diagram of another current detection circuit provided by an embodiment of the present invention. Figure 2 As shown, the current acquisition module 120 includes a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a third voltage-dividing resistor R3, a fourth voltage-dividing resistor R4 and a first operational amplifier D1;

[0040] The first end of the first voltage-dividing resistor R1 serves as the first end of the current acquisition module 120, the second end of the first voltage-dividing resistor R1 and the first end of the second voltage-dividing resistor R2 are both connected to the positive input terminal of the first operational amplifier D1, the second end of the second voltage-dividing resistor R2 is grounded, the first end of the third voltage-dividing resistor R3 serves as the second end of the current acquisition module 120, the second end of the third voltage-dividing resistor R3 and the first end of the fourth voltage-dividing resistor R4 are both connected to the negative input terminal of the first operational amplifier D1, the second end of the fourth voltage-dividing resistor R4 is connected to the output terminal of the first operational amplifier D1, and serves as the third end of the current acquisition module 120.

[0041] The resistance value of the first voltage-dividing resistor R1 is equal to the resistance value of the third voltage-dividing resistor R3 , and the resistance value of the second voltage-dividing resistor R2 is equal to the resistance value of the fourth voltage-dividing resistor R4 .

[0042] Among them, according to the connection relationship between the first voltage-dividing resistor R1, the second voltage-dividing resistor R2, the third voltage-dividing resistor R3, the fourth voltage-dividing resistor R4 and the first operational amplifier D1 and the virtual short and virtual open characteristics of the first operational amplifier D1, it can be known that the output voltage of the first operational amplifier D1 is in a multiple relationship with the current flowing through the device to be detected 210.

[0043] Exemplarily, assume that the resistance of the device to be detected is R0, the current of the resistor R0 is I1, the voltage at the connection point between the first voltage-dividing resistor R1 and the device to be detected 210 is V1, the voltage at the connection point between the third voltage-dividing resistor R3 and the device to be detected 210 is V2, the voltage at the connection point between the second voltage-dividing resistor R2 and the first operational amplifier D1 is Vp, the voltage at the connection point between the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 and the negative input terminal of the first operational amplifier D1 is Vn, and the voltage at the connection point between the fourth voltage-dividing resistor R4 and the output terminal of the first operational amplifier D1 is Vf.

[0044] From this we can see that

[0045] According to the virtual short and virtual open characteristics of the first operational amplifier D1, Vp = Vn, and R1 = R3, R2 = R4, we can get: Right now

[0046] Therefore, the multiple relationship between the output voltage of the first operational amplifier D1 and the current flowing through the device to be detected 210 is:

[0047] Based on the above embodiment, optionally, continue to refer to Figure 2 , the detection module 130 includes a detection current setting unit 131 and a detection unit 132;

[0048] The negative input terminal of the detection unit 132 serves as the first terminal of the detection module 130, the detection current setting unit 131 is connected to the positive input terminal of the detection unit 132, and the output terminal of the detection unit 132 serves as the second terminal of the detection module 130; the detection current setting unit 131 can set the reference voltage of the detection unit 132, and the detection unit 132 can detect the current detection signal according to the reference voltage and output the detection result signal.

[0049] Among them, the detection current setting unit 131 can set the reference voltage according to the detection current standard of the device to be detected 210, so that the detection unit 132 can detect the current detection signal based on the reference voltage, and then indirectly determine the relationship between the current flowing through the device to be detected 210 and the reference voltage.

[0050] In addition, the detection result signal includes a first detection result signal and a second detection result signal. If the current detection signal is greater than the reference voltage, the detection unit 132 outputs the first detection result signal; if the current detection signal is less than the reference voltage, the detection unit 132 outputs the second detection result signal.

[0051] Based on the above embodiment, optionally, continue to refer to Figure 2 , the detection current setting unit 131 includes a sliding resistor RT and a fifth voltage-dividing resistor R5;

[0052] The first ends of the sliding resistor RT and the fifth voltage-dividing resistor R5 are both connected to the positive input end of the detection unit 132, and the second end of the fifth voltage-dividing resistor R5 is grounded.

[0053] The detection unit 132 includes a second operational amplifier D2;

[0054] The negative input terminal of the second operational amplifier D2 serves as the negative input terminal of the detection unit 132 , the positive input terminal of the second operational amplifier D2 serves as the positive input terminal of the detection unit 132 , and the output terminal of the second operational amplifier D2 serves as the output terminal of the detection unit 132 .

[0055] Specifically, the first ends of the sliding rheostat RT and the fifth voltage-dividing resistor R5 are both connected to the positive input end of the second operational amplifier D2, the output end of the first operational amplifier D1 is connected to the negative input end of the second operational amplifier D2, and the output ends of the two operational amplifiers are connected to the signal output control module 140. It can be seen that the positive input end of the second operational amplifier D2 inputs the reference voltage, and the negative input end of the second operational amplifier D2 inputs the current detection signal.

[0056] Among them, the voltage of the fifth voltage-dividing resistor R5 is a reference voltage, and the voltage of the fifth voltage-dividing resistor R5 can be adjusted by the sliding variable resistor RT to have a certain multiple relationship with the current standard of the device to be detected 210. The multiple between the voltage of the fifth voltage-dividing resistor R5 and the current standard of the device to be detected 210 is equal to the multiple between the output voltage of the first operational amplifier D1 and the current flowing through the device to be detected 210. When the current detection signal is greater than the reference voltage, the output end of the second operational amplifier D2 outputs a low level (first detection result signal); when the current detection signal is less than the reference voltage, the output end of the second operational amplifier D2 outputs a high level (second detection result signal).

[0057] Based on the above embodiment, optionally, Figure 3 FIG. 1 is a schematic diagram of another current detection circuit provided by an embodiment of the present invention. Figure 3 As shown, the detection current setting unit 131 includes a control chip 1311 and a digital-to-analog converter 1312;

[0058] The control chip 1311 is connected to the digital-to-analog converter 1312 , and the digital-to-analog converter 1312 is connected to the positive input terminal of the detection unit 132 .

[0059] The reference voltage can be directly set by the control chip 1311, and the multiple between the set reference voltage and the current standard of the device to be detected 210 is equal to the multiple between the output voltage of the first operational amplifier D1 and the current flowing through the device to be detected 210. The analog-to-digital converter can convert the type of the reference voltage from an analog quantity to a digital quantity.

[0060] Based on the above embodiment, optionally, continue to refer to Figure 2 or Figure 3 , the signal output control module 140 includes a switch unit 141, a first current limiting unit 142 and a second current limiting unit 143;

[0061] The first end of the first current limiting unit 142 serves as the first end of the signal output control module 140, the second end of the first current limiting unit 142 is connected to the first end of the switch unit 141, the control end of the switch unit 141 serves as the second end of the signal output control module 140, the second end of the switch unit 141 is connected to the first end of the second current limiting unit 143 and serves as the third end of the signal output control module 140, and the second end of the second current limiting unit 143 is grounded.

[0062] The first current limiting unit 142 and the second current limiting unit 143 can limit the current flowing through the switch unit 141 to prevent the switch unit 141 from being burned due to excessive current.

[0063] Specifically, the switch unit 141 includes an N-type MOS tube P, the first current limiting unit 142 includes a first current limiting resistor R6, and the second current limiting unit 143 includes a second current limiting resistor R7; the first end of the first current limiting resistor R6 serves as the first end of the first current limiting unit 142, and the second end of the first current limiting resistor R6 serves as the second end of the first current limiting unit 142; the first end of the second current limiting resistor R7 serves as the first end of the second current limiting unit 143, and the second end of the second current limiting resistor R7 serves as the second end of the second current limiting unit 143; the gate of the N-type MOS tube P serves as the control end of the switch unit 141, the first pole of the N-type MOS tube P serves as the first end of the switch unit 141, and the second pole of the N-type MOS tube P serves as the second end of the switch unit 141.

[0064] The first end of the first current limiting resistor R6 is connected to the second end of the device to be detected 210 and the first end of the third voltage-dividing resistor R3, the second end of the first current limiting resistor R6 is connected to the first stage of the N-type MOS transistor P, the gate of the N-type MOS transistor P is connected to the output end of the second operational amplifier D2, the second electrode of the N-type MOS transistor P and the first end of the second current limiting resistor R7 are both connected to the signal output end 150, and the second end of the second current limiting resistor R7 is grounded.

[0065] When the current detection signal is greater than the reference voltage, the output terminal of the second operational amplifier D2 outputs a low level (a first detection result signal), and the first and second electrodes of the N-type MOS tube P are disconnected. At this time, the potential of the signal output terminal 150 is pulled down by the second current limiting unit 143, and the signal output terminal 150 outputs a low voltage. The detection result reflected at this time is that the current detection signal is greater than the reference voltage, that is, the current flowing through the device to be detected 210 is greater than its current standard.

[0066] When the current detection signal is less than the reference voltage, the output terminal of the second operational amplifier D2 outputs a high level (a second detection result signal), and the first and second electrodes of the N-type MOS tube P are turned on. At this time, the signal output terminal 150 outputs a high voltage. The detection result reflected at this time is that the current detection signal is less than the reference voltage, that is, the current flowing through the device to be detected 210 is less than its current standard.

[0067] An embodiment of the present invention further provides a detection device, which includes the current detection circuit provided by any embodiment of the present invention, and thus has the beneficial effects of the current detection circuit, which will not be described in detail here.

[0068] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0069] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A current detection circuit, characterized in that: It includes a power input terminal, a current acquisition module, a detection module, a signal output control module and a signal output terminal; The power input terminal and the first terminal of the current acquisition module are both connected to the first terminal of the device to be detected, the second terminal of the current acquisition module and the second terminal of the device to be detected are both connected to the first terminal of the signal output control module, the third terminal of the current acquisition module is connected to the first terminal of the detection module, the second terminal of the detection module is connected to the second terminal of the signal output control module, and the third terminal of the signal output control module is connected to the signal output terminal; The power input terminal can transmit electric energy to the device to be detected, and the current acquisition module can generate a current detection signal according to the current flowing through the device to be detected; the detection module can preset a reference voltage, and detect the current detection signal according to the preset reference voltage, and output a detection result signal; the signal output control module can control the signal output terminal to reflect the detection result through the output voltage according to the detection result signal.

2. The current detection circuit according to claim 1, characterized in that: The current acquisition module includes a first voltage-dividing resistor, a second voltage-dividing resistor, a third voltage-dividing resistor, a fourth voltage-dividing resistor and a first operational amplifier; The first end of the first voltage-dividing resistor serves as the first end of the current acquisition module, the second end of the first voltage-dividing resistor and the first end of the second voltage-dividing resistor are both connected to the positive input terminal of the first operational amplifier, the second end of the second voltage-dividing resistor is grounded, the first end of the third voltage-dividing resistor serves as the second end of the current acquisition module, the second end of the third voltage-dividing resistor and the first end of the fourth voltage-dividing resistor are both connected to the negative input terminal of the first operational amplifier, and the second end of the fourth voltage-dividing resistor is connected to the output terminal of the first operational amplifier and serves as the third end of the current acquisition module.

3. The current detection circuit according to claim 2, characterized in that: The resistance value of the first voltage-dividing resistor is equal to the resistance value of the third voltage-dividing resistor, and the resistance value of the second voltage-dividing resistor is equal to the resistance value of the fourth voltage-dividing resistor.

4. The current detection circuit according to claim 1, characterized in that: The detection module includes a detection current setting unit and a detection unit; The negative input terminal of the detection unit serves as the first terminal of the detection module, the detection current setting unit is connected to the positive input terminal of the detection unit, and the output terminal of the detection unit serves as the second terminal of the detection module; The detection current setting unit can set a reference voltage of the detection unit, and the detection unit can detect the current detection signal according to the reference voltage and output the detection result signal.

5. The current detection circuit according to claim 4, characterized in that: The detection current setting unit includes a sliding resistor and a fifth voltage-dividing resistor; The first ends of the sliding rheostat and the fifth voltage-dividing resistor are both connected to the positive input end of the detection unit, and the second end of the fifth voltage-dividing resistor is grounded.

6. The current detection circuit according to claim 4, characterized in that: The detection current setting unit includes a control chip and a digital-to-analog converter; The control chip is connected to the digital-to-analog converter, and the digital-to-analog converter is connected to the positive input terminal of the detection unit.

7. The current detection circuit according to claim 4, characterized in that: The detection unit includes a second operational amplifier; The negative input terminal of the second operational amplifier serves as the negative input terminal of the detection unit, the positive input terminal of the second operational amplifier serves as the positive input terminal of the detection unit, and the output terminal of the second operational amplifier serves as the output terminal of the detection unit.

8. The current detection circuit according to claim 1, characterized in that: The signal output control module includes a switch unit, a first current limiting unit and a second current limiting unit; The first end of the first current limiting unit serves as the first end of the signal output control module, the second end of the first current limiting unit is connected to the first end of the switch unit, the control end of the switch unit serves as the second end of the signal output control module, the second end of the switch unit is connected to the first end of the second current limiting unit and serves as the third end of the signal output control module, and the second end of the second current limiting unit is grounded.

9. The current detection circuit according to claim 8, characterized in that: The switch unit includes an N-type MOS tube, the first current limiting unit includes a first current limiting resistor, and the second current limiting unit includes a second current limiting resistor; The first end of the first current limiting resistor serves as the first end of the first current limiting unit, and the second end of the first current limiting resistor serves as the second end of the first current limiting unit; The first end of the second current limiting resistor serves as the first end of the second current limiting unit, and the second end of the second current limiting resistor serves as the second end of the second current limiting unit; The gate of the N-type MOS tube serves as the control end of the switch unit, the first electrode of the N-type MOS tube serves as the first end of the switch unit, and the second electrode of the N-type MOS tube serves as the second end of the switch unit.

10. A detection device, characterized in that: The invention comprises the current detection circuit as described in any one of claims 1 to 9.

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