Intelligent electronic fuse circuit for automobile

Abstract

The invention provides an intelligent electronic fuse circuit for an automobile. Comprising a fault feedback module, a first fault detection module, a second fault detection module, a power switch module and a control module, wherein the fault feedback module is used for feeding back faults; the first fault detection module is used for detecting overcurrent faults of external electric appliances; the second fault detection module is used for detecting short-circuit faults of the external electric appliances; the fault feedback module, the first fault detection module, the second fault detection module and the power switch module are all connected with the control module, and the fault feedback module, the first fault detection module, the second fault detection module and the power switch module are mutually connected; compared with the prior art, the system has the advantages that the response speed is high, faults such as short circuit and overcurrent of an external circuit can be detected, quiescent current and power consumption are extremely low, the requirements for energy conservation and emission reduction of new energy vehicles are met, and the safety target of the corresponding function level of the functional safety regulation ISO26262 can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to an intelligent electronic fuse circuit for automobiles. Background Art

[0002] With the continuous development of automobile intelligence and autonomous driving technology, the demand for primary intelligent power distribution systems is also increasing. At present, most of the low-voltage power distribution systems on the market are still using traditional thermal fuses and electromagnetic contact relays. The problem is that thermal fuses are prone to aging, the service life is difficult to guarantee, the installation and matching are difficult, and the open-loop control does not support diagnosis. They cannot meet the functional safety level requirements of ASILD, let alone adapt to higher-level intelligent assisted driving / autonomous driving systems. The development of automobile intelligence / autonomous driving technology is unstoppable, and low-power smart fuses must be an indispensable choice for intelligent power distribution system products. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an intelligent electronic fuse circuit for automobiles, which is used to solve the problems that the existing thermal fuses are prone to aging, difficult to guarantee life, difficult to install and match, open-loop control does not support diagnosis, cannot meet the functional safety level requirements of ASIL D, and cannot adapt to higher-level intelligent assisted driving / autonomous driving systems.

[0004] To achieve the above objectives and other related objectives, the present invention provides the following technical solutions:

[0005] An intelligent electronic fuse circuit for automobiles, comprising: a fault feedback module for providing feedback on faults, a first fault detection module for detecting overcurrent faults of external electrical appliances, a second fault detection module for detecting short circuit faults of external electrical appliances, a power switch module for controlling the on-off of a circuit between a vehicle power supply and the external electrical appliances, and a control module for controlling the above modules, wherein the fault feedback module, the first fault detection module, the second fault detection module and the power switch module are all connected to the control module, and the fault feedback module, the first fault detection module, the second fault detection module and the power switch module are connected to each other;

[0006] Among them, the first fault detection module or the second fault detection module responds to the fault signal sent by the fault feedback module to put the power switch module in a non-conducting state, and at the same time, the control module also responds to the fault signal sent by the first fault detection module or the second fault detection module to put the power switch module in a non-conducting state.

[0007] In one embodiment of the present invention, the fault feedback module includes a first operational amplifier and a tenth resistor, the same-direction input terminal of the first operational amplifier is connected to the output terminal of the vehicle power supply, the same-direction input terminal of the first operational amplifier is also connected to the power switch module through the tenth resistor, the reverse input terminal of the first operational amplifier is connected to the power switch module, and the output terminal of the first operational amplifier is respectively connected to the control module, the first fault detection module and the second fault detection module.

[0008] In one embodiment of the present invention, the first fault detection module includes a first switch submodule and a first signal amplification submodule connected to each other, the first switch submodule is respectively connected to the control module, the second fault detection module and the power switch module, and the first signal amplification submodule is respectively connected to the control module, the second fault detection module and the fault feedback module;

[0009] Among them, the first switch submodule includes a first transistor, a third transistor, a first diode, a third diode, a fifth diode and a first resistor, the base of the first transistor is connected to the first signal amplification submodule, the collector of the first transistor is connected to the control module through the first diode, the collector of the first transistor is also connected to the power switch module through the third diode, the collector of the first transistor is also connected to the first signal amplification submodule and the collector of the third transistor respectively through the fifth diode and the first resistor, the emitter of the first transistor is connected to the first power supply, the base of the third transistor is respectively connected to the control module and the second fault detection module, and the emitter of the third transistor is grounded.

[0010] In one embodiment of the present invention, the first signal amplification submodule includes a second operational amplifier, a second resistor, a fourth resistor and a fifth resistor, the same-direction input terminal of the second operational amplifier is connected to the second power supply through the fourth resistor, the same-direction input terminal of the second operational amplifier is also grounded through the fifth resistor, the reverse input terminal of the second operational amplifier is respectively connected to the control module and the fault feedback module through the second resistor, the reverse input terminal of the second operational amplifier is also connected to the first switch submodule, and the output terminal of the second operational amplifier is connected to the first switch submodule.

[0011] In one embodiment of the present invention, the second fault detection module includes a second switch submodule and a second signal amplification submodule connected to each other, the second switch submodule is also connected to the control module, the first fault detection module and the power switch module respectively, and the second signal amplification submodule is connected to the control module, the first fault detection module and the fault feedback module respectively;

[0012] Among them, the second switch submodule includes a second transistor, a fourth transistor, a second diode, a sixth diode, a seventh diode and a third resistor, the base of the second transistor is connected to the second signal amplification submodule, the collector of the second transistor is connected to the control module through the second diode, the collector of the second transistor is also connected to the power switch module through the sixth diode, the collector of the second transistor is also connected to the second signal amplification submodule and the collector of the fourth transistor respectively through the seventh diode and the third resistor, the emitter of the second transistor is connected to the third power supply, the base of the fourth transistor is respectively connected to the control module and the first fault detection module, and the emitter of the fourth transistor is grounded.

[0013] In one embodiment of the present invention, the second signal amplification submodule includes a third operational amplifier, a capacitor, and sixth to eighth resistors. The non-inverting input terminal of the third operational amplifier is connected to the fourth power supply through the seventh resistor, and the non-inverting input terminal of the third operational amplifier is also grounded through the eighth resistor. The reverse input terminal of the third operational amplifier is connected to the second switch submodule, and the reverse input terminal of the third operational amplifier is also connected to the control module, the first fault detection circuit and the fault feedback module respectively through the sixth resistor. The reverse input terminal of the third operational amplifier is also connected to the positive electrode of the capacitor, the negative electrode of the capacitor is grounded, and the output terminal of the third operational amplifier is connected to the second switch submodule.

[0014] In one embodiment of the present invention, the power switch module includes a third switch sub-module and a fourth switch sub-module that are interconnected, the third switch sub-module is respectively connected to the control module, the first fault detection module, the second fault detection module and the fault feedback module, and the fourth switch sub-module is connected to the fault feedback module and the external electrical appliance.

[0015] In one embodiment of the present invention, the third switch submodule includes a fifth transistor, a sixth transistor and a ninth resistor, the base of the fifth transistor is respectively connected to the control module, the first fault detection module and the second fault detection module, the collector of the fifth transistor is connected to the base of the sixth transistor, the emitter of the fifth transistor is grounded, the collector of the sixth transistor is connected to the fourth switch submodule, the collector of the sixth transistor is also grounded through the ninth resistor, and the emitter of the sixth transistor is respectively connected to the fault feedback module and the fourth switch submodule.

[0016] In one embodiment of the present invention, the fourth switch sub-module includes a field effect transistor, the gate of the field effect transistor is connected to the third switch sub-module, the source of the field effect transistor is respectively connected to the output end of the third switch sub-module, the fault feedback module and the vehicle power supply, and the drain of the field effect transistor is connected to the input end of the external electrical appliance.

[0017] In one embodiment of the present invention, the control module includes a controller and a fourth diode, the controller is respectively connected to the fault feedback module, the first fault detection module and the second fault detection module, and the controller is connected to the power switch module through the fourth diode.

[0018] As described above, the intelligent electronic fuse circuit for automobile of the present invention has the following beneficial effects:

[0019] The fault feedback module in the present invention can transmit the fault signal when an overcurrent or short-circuit fault occurs in an external electrical appliance to the first fault detection module or the second fault detection module. The first fault detection module or the second fault detection module responds to the fault signal sent by the fault feedback module to put the power switch module in a non-conducting state. At the same time, the control module also responds to the fault signal sent by the first fault detection module or the second fault detection module to put the power switch module in a non-conducting state, thereby cutting off the power supply of the vehicle power supply to the external electrical appliance; and when the power switch module is in a non-conducting state, the control module will cancel the shutdown signal, and when the external electrical appliance does not have a short circuit or overcurrent fault, the power switch module will return to its original conductive state, so that it can continue to supply power to the external circuit. Therefore, the present invention has a fast response speed, can detect faults such as short circuit and overcurrent in the external circuit, and has extremely low static current and power consumption, which meets the requirements of energy conservation and emission reduction of new energy vehicles, and can also achieve the functional safety regulations ISO26262 for the corresponding functional level safety goals. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is an overall structural block diagram of an intelligent electronic fuse circuit for automobile disclosed in an embodiment of the present invention;

[0021] Figure 2 Shown is an overall circuit schematic diagram of an intelligent electronic fuse circuit for an automobile disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0023] See also Figure 1The present invention provides an intelligent electronic fuse circuit for automobiles, comprising: a fault feedback module for providing feedback on faults, a first fault detection module for detecting overcurrent faults of external electrical appliances, a second fault detection module for detecting short circuit faults of external electrical appliances, a power switch module for controlling the on-off of a circuit between a vehicle power supply and external electrical appliances, and a control module for controlling the above modules.

[0024] See also Figure 2 , the fault feedback module includes a first operational amplifier and a tenth resistor, and the first operational amplifier IC1 and the tenth resistor R10 are taken as an example for explanation below;

[0025] The non-inverting input terminal of the first operational amplifier IC1 is connected to the output terminal of the vehicle power supply, and the non-inverting input terminal of the first operational amplifier IC1 is also connected to the power switch module through the tenth resistor R10. The reverse input terminal of the first operational amplifier IC1 is connected to the power switch module, and the output terminal of the first operational amplifier IC1 is respectively connected to the control module, the first fault detection module and the second fault detection module; wherein, when an overcurrent or short circuit occurs in the external electrical appliance, the current flowing through the tenth resistor R10 increases, and the first operational amplifier IC1 is used to amplify the voltage across the tenth resistor R10.

[0026] See also Figure 1 The first fault detection module includes a first switch submodule and a first signal amplification submodule which are connected to each other.

[0027] See also Figure 2 , the first switch submodule includes a first transistor, a third transistor, a first diode, a third diode, a fifth diode and a first resistor, and the first signal amplification submodule includes a second operational amplifier, a second resistor, a fourth resistor and a fifth resistor. The following takes the first transistor Q1, the third transistor Q3, the first diode D1, the third diode D3, the fifth diode D5, the first resistor R1, the second operational amplifier IC2, the second resistor R2, the fourth resistor R4 and the fifth resistor R5 as examples for explanation;

[0028] The base of the first transistor Q1 is connected to the first signal amplifying submodule, the collector of the first transistor Q1 is connected to the control module through the first diode D1, the collector of the first transistor Q1 is also connected to the power switch module through the third diode D3, the collector of the first transistor Q1 is also connected to the first signal amplifying submodule and the collector of the third transistor Q3 through the fifth diode D5 and the first resistor R1, the emitter of the first transistor Q1 is connected to the first power supply, the base of the third transistor Q3 is respectively connected to the control module and the second fault detection module, and the emitter of the third transistor Q3 is grounded;

[0029] The non-inverting input terminal of the second operational amplifier IC2 is connected to the second power supply through the fourth resistor R4, and the non-inverting input terminal of the second operational amplifier IC2 is also grounded through the fifth resistor R5. The reverse input terminal of the second operational amplifier IC2 is respectively connected to the control module and the fault feedback module through the second resistor R2, and the reverse input terminal of the second operational amplifier IC2 is also connected to the first switch sub-module, and the output terminal of the second operational amplifier IC2 is connected to the first switch sub-module; wherein, when an overcurrent fault occurs in the external electrical appliance, the fault feedback module inputs the fault signal into the second operational amplifier IC2 and after amplification by the second operational amplifier IC2, the first transistor Q1 is turned on, thereby making the field effect tube Q7 in the following text in the off state.

[0030] See also Figure 1 The second fault detection module includes a second switch submodule and a second signal amplification submodule connected to each other.

[0031] See also Figure 2 , the second switch submodule includes a second transistor, a fourth transistor, a second diode, a sixth diode, a seventh diode and a third resistor, and the second signal amplification submodule includes a third operational amplifier, a capacitor, and sixth to eighth resistors. The second transistor Q2, the fourth transistor Q4, the second diode D2, the sixth diode D6, the seventh diode D7, the third resistor R3, the third operational amplifier IC3, the capacitor C1, and the sixth to eighth resistors R6 to R8 are selected as examples for explanation;

[0032] The base of the second transistor Q2 is connected to the second signal amplifying submodule, the collector of the second transistor Q2 is connected to the control module through the second diode D2, the collector of the second transistor Q2 is also connected to the power switch module through the sixth diode D6, the collector of the second transistor Q2 is also connected to the second signal amplifying submodule and the collector of the fourth transistor Q4 through the seventh diode D7 and the third resistor R3, the emitter of the second transistor Q2 is connected to the third power supply, the base of the fourth transistor Q4 is respectively connected to the control module and the first fault detection module, and the emitter of the fourth transistor Q4 is grounded;

[0033] The non-inverting input terminal of the third operational amplifier IC3 is connected to the fourth power supply through the seventh resistor R7, and the non-inverting input terminal of the third operational amplifier IC3 is also grounded through the eighth resistor R8. The reverse input terminal of the third operational amplifier IC3 is connected to the second switch sub-module, and the reverse input terminal of the third operational amplifier IC3 is also connected to the control module, the first fault detection circuit and the fault feedback module through the sixth resistor R6 respectively. The reverse input terminal of the third operational amplifier IC3 is also connected to the positive electrode of the capacitor C1, the negative electrode of the capacitor C1 is grounded, and the output terminal of the third operational amplifier IC3 is connected to the second switch sub-module; wherein, when a short circuit fault occurs in the external electrical appliance, the fault feedback module inputs the fault signal into the third operational amplifier IC3 and after amplification by the third operational amplifier IC3, the second transistor Q2 is turned on, so that the field effect tube Q7 mentioned below is in the off state, so that the external electrical appliance is not powered.

[0034] See also Figure 1 The power switch module includes a third switch submodule and a fourth switch submodule connected to each other.

[0035] See also Figure 2 The third switch submodule includes a fifth transistor, a sixth transistor and a ninth resistor, and the fourth switch submodule includes a field effect transistor. In this embodiment, the field effect transistor is a PMOS transistor. The fifth transistor Q5, the sixth transistor Q6, the ninth resistor R9 and the field effect transistor Q7 are selected as examples for explanation;

[0036] The base of the fifth transistor Q5 is connected to the control module, the first fault detection module and the second fault detection module respectively, the collector of the fifth transistor Q5 is connected to the base of the sixth transistor Q6, the emitter of the fifth transistor Q5 is grounded, the collector of the sixth transistor Q6 is connected to the fourth switch sub-module, the collector of the sixth transistor Q6 is also grounded through the ninth resistor R9, and the emitter of the sixth transistor Q6 is connected to the fault feedback module and the fourth switch sub-module respectively; the gate of the field effect transistor Q7 is connected to the third switch sub-module, the source of the field effect transistor Q7 is connected to the third switch sub-module, the fault feedback module and the output end of the vehicle power supply respectively, and the drain of the field effect transistor Q7 is connected to the input end of the external electrical appliance; wherein, when an overcurrent or short circuit fault occurs in the external electrical appliance, the fifth transistor Q5 and the sixth transistor Q6 will be turned on, so that the field effect transistor Q7 is in an off state, thereby cutting off the power supply of the vehicle power supply to the external electrical appliance.

[0037] See also Figure 2The control module includes a controller and a fourth diode. The controller MCU and the fourth diode D4 are selected as examples for explanation below; the controller MCU is respectively connected to the fault feedback module, the first fault detection module and the second fault detection module, and the controller is connected to the power switch module through the fourth diode D4; wherein, after the controller MCU receives the fault signal transmitted by the first fault detection module or the second fault detection module, it will send a field effect tube Q7 shutdown signal to the power switch module, thereby keeping the field effect tube Q7 in the shutdown state.

[0038] Specifically, working state 1: Pin 1 of the field effect transistor Q7 in the power switch module is grounded through the ninth resistor R9, and remains in a normally open state, and the vehicle power supply current is transmitted to the external electrical appliance through Pin 3 of the field effect transistor Q7;

[0039] Working state two: when an overcurrent occurs in an external electrical appliance, the current flowing through the tenth resistor R10 increases, and the voltage across the tenth resistor R10 is amplified by the first operational amplifier IC1. The signal is input to the 1st pin of the second operational amplifier IC2 through the second resistor R2. After the voltage of the 1st pin is compared with the set value of the 2nd pin of the second operational amplifier IC2, the result is output to the 1st pin of the first transistor Q1, so that the first transistor Q1 is turned on, and the 2nd pin of the first transistor Q1 obtains a high-level voltage. This signal is transmitted to the detection pin of the controller MCU through the first diode D1, and the controller MCU determines that there is an overcurrent in the external circuit; at the same time, this high-level signal is transmitted to the 1st pin of the fifth transistor Q5 through the third diode D3. After the fifth transistor Q5 is turned on, the 1st pin of the fifth transistor Q5 is pulled low, the sixth transistor Q6 is turned on, and finally the field effect transistor Q7 is turned off, and the power supply to the external electrical appliance is stopped. At the same time, the controller MCU also sends a field effect transistor Q7 shutdown signal, which is transmitted to the 1st pin of the fifth transistor Q5 through the fourth diode D4, so as to keep the field effect transistor Q7 in the off state.

[0040] Working state three: when the external electrical appliance is short-circuited, the current flowing through the tenth resistor R10 increases, and the voltage across the tenth resistor R10 is amplified by the first operational amplifier IC1. The signal is input to the 1st pin of the third operational amplifier IC3 through the sixth resistor R6. After the voltage of the 1st pin is compared with the set value of the 2nd pin of the third operational amplifier IC3, the result is output to the 1st pin of the second transistor Q2, so that the second transistor Q2 is turned on, and the 2nd pin of the second transistor Q2 obtains a high-level voltage. This signal is transmitted to the detection pin of the controller MCU through the second diode D2, and the controller MCU determines that there is an external circuit short-circuit; at the same time, this high-level signal is transmitted to the 1st pin of the fifth transistor Q5 through the sixth diode D6. After the fifth transistor Q5 is turned on, the 1st pin of the sixth transistor Q6 is pulled low, and the sixth transistor Q6 is turned on. Finally, the field effect transistor Q7 is turned off, and the power supply to the external electrical appliance is stopped. At the same time, the controller MCU also sends a field effect transistor Q7 shutdown signal, which is transmitted to the 1st pin of the fifth transistor Q5 through the fourth diode D4, to keep the field effect transistor Q7 in the off state;

[0041] Working state four: After the field effect tube Q7 is turned off, the controller MCU will cancel the shutdown signal. When there is no external short circuit or overcurrent fault, the 1st pin of the fifth transistor Q5 will not be turned on by the signal from the sixth diode D6 or the third diode D3, and will be restored to the non-conducting state. At this time, the field effect tube Q7 is fully turned on, thereby continuing to supply power to external electrical appliances.

[0042] To sum up, the fault feedback module in the present invention can transmit the fault signal when an overcurrent or short-circuit fault occurs in an external electrical appliance to the first fault detection module or the second fault detection module. The first fault detection module or the second fault detection module responds to the fault signal sent by the fault feedback module to put the power switch module in a non-conducting state. At the same time, the control module also responds to the fault signal sent by the first fault detection module or the second fault detection module to put the power switch module in a non-conducting state, thereby cutting off the power supply of the vehicle power supply to the external electrical appliance; and when the power switch module is in a non-conducting state, the control module will cancel the shutdown signal, and when the external electrical appliance does not have a short circuit or overcurrent fault, the power switch module will return to its original conductive state, so that it can continue to supply power to the external circuit. Therefore, the present invention has a fast response speed, can detect faults such as short circuit and overcurrent in the external circuit, and has extremely low static current and power consumption, which meets the requirements of energy conservation and emission reduction of new energy vehicles, and can also achieve the functional safety regulations ISO26262 for the corresponding functional level safety goals.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. All equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An intelligent electronic fuse circuit for automobile, characterized in that: include: A fault feedback module for providing feedback on faults, a first fault detection module for detecting overcurrent faults of external electrical appliances, a second fault detection module for detecting short circuit faults of external electrical appliances, a power switch module for controlling the on-off of the circuit between the vehicle power supply and the external electrical appliances, and a control module for controlling the above modules, wherein the fault feedback module, the first fault detection module, the second fault detection module and the power switch module are all connected to the control module, and the fault feedback module, the first fault detection module, the second fault detection module and the power switch module are connected to each other; Among them, the first fault detection module or the second fault detection module responds to the fault signal sent by the fault feedback module to put the power switch module in a non-conducting state, and at the same time, the control module also responds to the fault signal sent by the first fault detection module or the second fault detection module to put the power switch module in a non-conducting state.

2. The intelligent electronic fuse circuit for automobile according to claim 1, characterized in that: The fault feedback module includes a first operational amplifier and a tenth resistor, the same-direction input terminal of the first operational amplifier is connected to the output terminal of the vehicle power supply, the same-direction input terminal of the first operational amplifier is also connected to the power switch module through the tenth resistor, the reverse input terminal of the first operational amplifier is connected to the power switch module, and the output terminal of the first operational amplifier is respectively connected to the control module, the first fault detection module and the second fault detection module.

3. The intelligent electronic fuse circuit for automobile according to claim 1, characterized in that: The first fault detection module comprises a first switch submodule and a first signal amplification submodule connected to each other, the first switch submodule is respectively connected to the control module, the second fault detection module and the power switch module, and the first signal amplification submodule is respectively connected to the control module, the second fault detection module and the fault feedback module; Among them, the first switch submodule includes a first transistor, a third transistor, a first diode, a third diode, a fifth diode and a first resistor, the base of the first transistor is connected to the first signal amplification submodule, the collector of the first transistor is connected to the control module through the first diode, the collector of the first transistor is also connected to the power switch module through the third diode, the collector of the first transistor is also connected to the first signal amplification submodule and the collector of the third transistor respectively through the fifth diode and the first resistor, the emitter of the first transistor is connected to the first power supply, the base of the third transistor is respectively connected to the control module and the second fault detection module, and the emitter of the third transistor is grounded.

4. The intelligent electronic fuse circuit for automobile according to claim 3, characterized in that: The first signal amplification submodule includes a second operational amplifier, a second resistor, a fourth resistor and a fifth resistor. The same-direction input terminal of the second operational amplifier is connected to the second power supply through the fourth resistor, and the same-direction input terminal of the second operational amplifier is also grounded through the fifth resistor. The reverse input terminal of the second operational amplifier is respectively connected to the control module and the fault feedback module through the second resistor, the reverse input terminal of the second operational amplifier is also connected to the first switch submodule, and the output terminal of the second operational amplifier is connected to the first switch submodule.

5. The intelligent electronic fuse circuit for automobile according to claim 1, characterized in that: The second fault detection module includes a second switch submodule and a second signal amplification submodule connected to each other, the second switch submodule is also connected to the control module, the first fault detection module and the power switch module respectively, and the second signal amplification submodule is connected to the control module, the first fault detection module and the fault feedback module respectively; Among them, the second switch submodule includes a second transistor, a fourth transistor, a second diode, a sixth diode, a seventh diode and a third resistor, the base of the second transistor is connected to the second signal amplification submodule, the collector of the second transistor is connected to the control module through the second diode, the collector of the second transistor is also connected to the power switch module through the sixth diode, the collector of the second transistor is also connected to the second signal amplification submodule and the collector of the fourth transistor respectively through the seventh diode and the third resistor, the emitter of the second transistor is connected to the third power supply, the base of the fourth transistor is respectively connected to the control module and the first fault detection module, and the emitter of the fourth transistor is grounded.

6. The intelligent electronic fuse circuit for automobile according to claim 5, characterized in that: The second signal amplification submodule includes a third operational amplifier, a capacitor, and sixth to eighth resistors. The same-direction input terminal of the third operational amplifier is connected to the fourth power supply through the seventh resistor, and the same-direction input terminal of the third operational amplifier is also grounded through the eighth resistor. The reverse input terminal of the third operational amplifier is connected to the second switch submodule, and the reverse input terminal of the third operational amplifier is also connected to the control module, the first fault detection circuit and the fault feedback module respectively through the sixth resistor. The reverse input terminal of the third operational amplifier is also connected to the positive electrode of the capacitor, the negative electrode of the capacitor is grounded, and the output terminal of the third operational amplifier is connected to the second switch submodule.

7. The intelligent electronic fuse circuit for automobile according to claim 1, characterized in that: The power switch module includes a third switch submodule and a fourth switch submodule connected to each other, the third switch submodule is respectively connected to the control module, the first fault detection module, the second fault detection module and the fault feedback module, and the fourth switch submodule is connected to the fault feedback module and the external electrical appliance.

8. The intelligent electronic fuse circuit for automobile according to claim 7, characterized in that: The third switch submodule includes a fifth transistor, a sixth transistor and a ninth resistor, the base of the fifth transistor is respectively connected to the control module, the first fault detection module and the second fault detection module, the collector of the fifth transistor is connected to the base of the sixth transistor, the emitter of the fifth transistor is grounded, the collector of the sixth transistor is connected to the fourth switch submodule, the collector of the sixth transistor is also grounded through the ninth resistor, and the emitter of the sixth transistor is respectively connected to the fault feedback module and the fourth switch submodule.

9. The intelligent electronic fuse circuit for automobile according to claim 7, characterized in that: The fourth switch submodule includes a field effect tube, the gate of the field effect tube is connected to the third switch submodule, the source of the field effect tube is respectively connected to the output end of the third switch submodule, the fault feedback module and the vehicle power supply, and the drain of the field effect tube is connected to the input end of the external electrical appliance.

10. The intelligent electronic fuse circuit for automobile according to claim 1, characterized in that: The control module includes a controller and a fourth diode. The controller is connected to the fault feedback module, the first fault detection module and the second fault detection module respectively. The controller is connected to the power switch module through the fourth diode.

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