Surge detection circuit and method, analog front end, battery management system, electronic equipment and vehicle

Abstract

The invention discloses a surge detection circuit and method, an analog front end, a battery management system, an electronic device and a vehicle, and the circuit comprises a magnetic induction module which is used for collecting a surge magnetic induction signal; the oscillating circuit module is connected with the magnetic induction module and is used for generating an oscillating signal according to the surge magnetic induction signal; and the signal detection circuit module is connected with the oscillation circuit module and is used for generating a surge detection signal according to the oscillation signal. By adopting the circuit, whether the chip suffers from surge can be detected, and when it is detected that the chip suffers from surge, a surge detection signal is output, and active detection is realized, so that it can be determined that the chip breaks down due to surge, data support is provided for the chip fault, and fault analysis and technical improvement on the chip are facilitated.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a surge detection circuit, a surge detection method, an analog front end, a battery management system, an electronic device and a vehicle. Background Art

[0002] In the prior art, filters such as capacitors and transient voltage suppression diodes are added to the chip ports to achieve passive tolerance of transient electromagnetic disturbances. When the transient electromagnetic disturbance energy is relatively small, the chip port filter devices such as capacitors and voltage suppression diodes on the controller can absorb and consume it; when the transient electromagnetic disturbance energy is relatively large, the chip port filter devices will not absorb and consume it in time and damage the controller; the prior art can only passively defend without the function of active detection and active reporting of faults, and the root cause of the chip failure cannot be determined. Only when the chip is damaged can it be suspected that a surge may have occurred in the high-voltage battery pack. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a surge detection circuit, which can detect whether a chip is subjected to a surge, and when the chip is detected to be subjected to a surge, a surge detection signal is output to realize active surge detection, so that it can be determined that the chip fails due to the surge, and data support is provided for chip failure.

[0004] The second objective of the present invention is to provide an analog front end.

[0005] The third objective of the present invention is to provide a battery management system.

[0006] A fourth objective of the present invention is to provide a surge detection method.

[0007] A fifth objective of the present invention is to provide an electronic device.

[0008] A sixth object of the present invention is to provide a vehicle.

[0009] In order to solve the above problems, the first aspect of the embodiment of the present invention provides a surge detection circuit, including: a magnetic induction module, used to collect surge magnetic induction signals; an oscillation circuit module, connected to the magnetic induction module, used to generate an oscillation signal according to the surge magnetic induction signal; a signal detection circuit module, connected to the oscillation circuit module, used to generate a surge detection signal according to the oscillation signal.

[0010] According to the surge detection circuit of the embodiment of the present invention, the surge magnetic induction signal is collected by the magnetic induction module, the oscillation circuit module generates an oscillation signal according to the surge magnetic induction signal, and the signal detection circuit module generates a surge detection signal according to the oscillation signal and outputs the surge detection signal, thereby realizing active detection of surges, providing data support for chip fault analysis, providing evidence for determining that the chip fails due to surges, avoiding the assumption that the chip has design or manufacturing defects, and being more conducive to chip fault analysis and technical improvement.

[0011] In some embodiments, the surge detection circuit further includes: a signal maintaining circuit module, connected to the signal detection circuit module, and configured to maintain the surge detection signal.

[0012] In some embodiments, the surge detection circuit further includes: a reset circuit module connected to the signal maintaining circuit module, and configured to control the signal maintaining circuit module to reset in response to a surge detection signal reset instruction.

[0013] In some embodiments, the magnetic induction module includes: a magnetic induction component, which is led out from a magnetic induction port of the magnetic induction module through a wiring harness, and one end of the magnetic induction component is connected to the oscillation circuit module for sensing surge magnetic induction signals.

[0014] In some embodiments, the magnetic induction component includes: a magnetic induction wire bundle, a first end of which is connected to the oscillation circuit module, and the magnetic induction wire bundle is suitable for winding around the target signal wire bundle to sense the surge magnetic induction signal of the target signal wire bundle.

[0015] In some embodiments, the magnetic induction module includes: a magnetic induction coil, a first end of which is connected to the oscillation circuit module, and the magnetic induction coil is arranged on a circuit board where the surge detection circuit is located to sense a surge magnetic induction signal.

[0016] In some embodiments, the magnetic induction module further includes: a first capacitor, a first end of the first capacitor is connected to the first end of the magnetic induction component, and a second end of the first capacitor is connected to the oscillation circuit module for transmitting the surge magnetic induction signal.

[0017] In some embodiments, the magnetic induction module further includes: a first resistor, a first end of the first resistor is connected to the first end of the magnetic induction component and the first end of the first capacitor, and a second end of the first resistor is grounded.

[0018] In some embodiments, the oscillation circuit module includes: a first switch tube, a first end of the first switch tube is connected to a power supply through a second resistor, a second end of the first switch tube is grounded, a control end of the first switch tube is connected to the second end of the first capacitor, and the first switch tube is used to turn on in response to the surge magnetic induction signal.

[0019] In some embodiments, the oscillation circuit module also includes: a second switch tube, a first end of the second switch tube is connected to the power supply through a third resistor, a second end of the second switch tube is grounded through a fourth resistor, a control end of the second switch tube is connected to the first end of the first switch tube, and the second switch tube is used to switch from an on state to an off state when the first switch tube is turned on; wherein, when there is a surge magnetic induction signal, the switch state changes of the first switch tube and the second switch tube cause the first end of the second switch tube to generate an oscillation signal.

[0020] In some embodiments, the oscillation circuit module further includes: a second capacitor, a first end of the second capacitor is connected to the control end of the first switch tube and the second end of the second switch tube, and is used to absorb the oscillation signal.

[0021] In some embodiments, the signal detection circuit module includes: a rectifier and filter unit, a first end of the rectifier and filter unit is connected to the first end of the second switch tube, and a second end of the rectifier and filter unit is grounded, for obtaining a forward voltage signal in the oscillation signal; a third switch tube, a first end of the third switch tube is connected to the power supply, a second end of the third switch tube is grounded, and a control end of the third switch tube is connected to the third end of the rectifier and filter unit, for being turned on in response to the forward voltage signal to output the surge detection signal.

[0022] In some embodiments, the rectification and filtering unit includes: a third capacitor, a first end of the third capacitor is connected to the first end of the second switch tube, and a second end of the third capacitor is connected to the control end of the third switch tube; a first diode, a positive end of the first diode is grounded, and a negative end of the first diode is connected to the second end of the third capacitor and the control end of the third switch tube.

[0023] In some embodiments, the signal detection circuit module further includes: a fourth capacitor, a first end of the fourth capacitor is connected to the second end of the third switch tube, and a second end of the fourth capacitor is grounded.

[0024] In some embodiments, the signal maintaining circuit module includes: a fourth switch tube, a first end of the fourth switch tube is connected to the power supply through a fifth resistor, a second end of the fourth switch tube is grounded, a control end of the fourth switch tube is connected to the second end of the third switch tube, and the fourth switch tube is used to be turned on in response to the surge detection signal; a fifth switch tube, a first end of the fifth switch tube is grounded through a sixth resistor, a second end of the fifth switch tube is connected to the power supply through a seventh resistor, a control end of the fifth switch tube is connected to the first end of the fourth switch tube, and the fifth switch tube is used to switch to a conducting state in response to the turning on of the fourth switch tube, so that the control end of the fourth switch tube is maintained at the level of the surge detection signal.

[0025] In some embodiments, the signal maintaining circuit module also includes: a fifth capacitor, a first end of the fifth capacitor is connected to the control end of the fifth switch tube, and a second end of the fifth capacitor is connected to the control end of the fourth switch tube; a sixth capacitor, a first end of the sixth capacitor is connected to the control end of the fourth switch tube, and a second end of the sixth capacitor is grounded.

[0026] In some embodiments, the clearing circuit module includes: a sixth switch tube, the first end of the sixth switch tube is connected to the second end of the fifth switch tube, the second end of the sixth switch tube is grounded, the control end of the sixth switch tube is used to receive the surge detection signal clearing instruction, and the sixth switch tube is used to control the signal maintenance circuit module to reset in response to the surge detection signal clearing instruction.

[0027] In some embodiments, the surge detection circuit also includes: a signal acquisition circuit module, which is connected to the second end of the third switch tube and the control end of the fourth switch tube, and is used to collect the surge detection signal in response to a signal acquisition instruction and convert the surge detection signal into a digital signal.

[0028] A second aspect of the present invention provides an analog front end, comprising the surge detection circuit described in the above embodiment.

[0029] According to the analog front end of the embodiment of the present invention, a surge detection circuit inside the analog front end is used to detect whether the analog front end is subjected to a surge. When the analog front end fails due to a surge, a surge detection signal is output to provide data support for the fault analysis of the analog front end and provide evidence for determining that the analog front end fails due to a surge.

[0030] A third aspect of the present invention provides a battery management system, comprising: the analog front end described in the above embodiment; and a main control chip, wherein the main control chip is connected to the analog front end.

[0031] According to the battery management system of the embodiment of the present invention, the main control chip is connected to the analog front end, and the main control chip controls the analog front end to detect whether the battery management system is subjected to a surge during operation. When it is detected that the battery management system is subjected to a surge, the surge detection circuit in the analog front end outputs a surge detection signal to detect the surge in the battery management system, thereby providing data support for determining the cause of the battery management system failure due to the surge, and facilitating fault analysis and technical improvements on the main control chip.

[0032] In some embodiments, the battery management system further includes: a passive surge protection module, wherein the passive surge protection module is located at a signal port of the analog front end.

[0033] In some embodiments, the passive surge protection module includes: a seventh capacitor, a first end of the seventh capacitor is connected to a power supply, and a second end of the seventh capacitor is grounded; a Zener diode, a positive terminal of the Zener diode is grounded, and a negative terminal of the Zener diode is connected to the power supply.

[0034] A fourth aspect of the present invention provides a surge detection method for the battery management system described in the above embodiment, the surge detection method comprising: obtaining a surge detection signal detected by a surge detection circuit of an analog front end; determining that a surge fault has occurred in the battery management system based on the surge detection signal; and issuing an alarm prompt based on the surge fault.

[0035] According to the surge detection method of the embodiment of the present invention, a surge detection circuit is used to detect whether the battery management system is subjected to a surge impact. After the battery management system is subjected to a surge impact, the surge detection circuit outputs a surge detection signal to determine that a surge fault has occurred in the battery management system and to issue an alarm, thereby determining that the battery management system has failed due to a surge and facilitating fault analysis of the battery management system.

[0036] In some embodiments, the surge detection method further includes: after determining that a surge fault occurs in the battery management system, sending a surge detection signal clearing instruction to the surge detection circuit, so that the surge detection circuit clears the surge detection signal this time.

[0037] A fifth aspect of the present invention provides an electronic device, comprising: at least one processor; a memory communicatively connected to the at least one processor; the memory storing a computer program executable by the at least one processor, wherein the at least one processor implements the surge detection method described in the above embodiment when executing the computer program.

[0038] According to the electronic device of the embodiment of the present invention, the corresponding surge detection program can be stored in the memory. When the surge detection method is implemented, the processor runs the program in the memory, so that the magnetic induction module in the surge detection circuit collects the surge magnetic induction signal, generates an oscillation signal according to the surge magnetic induction signal, and finally outputs the surge detection signal, thereby realizing active detection and active reporting of surge faults.

[0039] A sixth aspect of the present invention provides a vehicle, comprising: a battery pack; and a battery management system as described in the above embodiment, wherein an analog front end of the battery management system is connected to the battery pack.

[0040] According to the vehicle of the embodiment of the present invention, an analog front end is set in the battery management system to detect whether the battery management system is subjected to a surge impact caused by the battery pack during operation. After detecting that the battery management system is subjected to a surge impact, the surge detection circuit in the analog front end outputs a surge detection signal, thereby providing data support for determining the cause of the battery management system failure, thereby facilitating fault analysis and technical improvement of the battery management system.

[0041] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0043] Figure 1 is a schematic diagram of a surge detection circuit according to an embodiment of the present invention;

[0044] Figure 2 is a schematic diagram of the winding of a magnetic flux bundle according to an embodiment of the present invention;

[0045] Figure 3 is a schematic diagram of the routing of a magnetic induction coil according to an embodiment of the present invention;

[0046] Figure 4 is a block diagram of an analog front end according to an embodiment of the present invention;

[0047] Figure 5 is a structural block diagram of a battery management system according to an embodiment of the present invention;

[0048] Figure 6 is a flow chart of a surge detection method according to an embodiment of the present invention;

[0049] Figure 7 is a flow chart of surge detection steps according to one embodiment of the present invention;

[0050] Figure 8 is a structural block diagram of an electronic device according to an embodiment of the present invention;

[0051] Fig. 9 is a structural block diagram of a vehicle according to an embodiment of the present invention.

[0052] Reference numerals:

[0053] Vehicle 500; Electronic device 400;

[0054] Battery management system 300; battery pack 501; processor 401; memory 402;

[0055] Analog front end 200; passive surge protection module 320; main control chip 310;

[0056] Surge detection circuit 1000;

[0057] Magnetic induction module 1100; oscillation circuit module 1200; signal detection circuit module 1300; signal maintenance circuit module 1400; clearing circuit module 1500; signal acquisition circuit module 1600;

[0058] Magnetic induction element 1110; magnetic flux bundle 1111; magnetic induction coil 1120; first capacitor 1101; first resistor 1102; first switch tube 1210; second resistor 1201; second switch tube 1220; third resistor 1202; fourth resistor 1203; second capacitor 1204; rectification and filtering unit 1310; third switch tube 1320; third capacitor 1311; first diode 1312; fourth capacitor 1301; fourth switch tube 1410; fifth resistor 1401; fifth switch tube 1420; sixth resistor 1402; seventh resistor 1403; fifth capacitor 1404; sixth capacitor 1405; sixth switch tube 1510; seventh capacitor 321; voltage regulator diode 322. DETAILED DESCRIPTION

[0059] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0060] The first aspect of the present invention provides a surge detection circuit, which can detect whether a chip is subjected to a surge. When it is detected that the chip is subjected to a surge, a surge detection signal is output to implement active surge detection, thereby determining that the chip fails due to the surge, and providing data support for the chip failure.

[0061] For new energy vehicles, high-voltage batteries, i.e., power batteries, are the main power energy sources, and the characteristics of the high-voltage system brought by high-voltage batteries are gradually receiving attention from technicians. For example, when the vehicle is in the moment of high and low voltage electricity, if there is an insulation weakness between the high and low voltage of the battery pack, the voltage will change instantly due to the closing relay, resulting in dozens of arc breakdowns and re-breakdowns at the insulation weakness point, forming an arc current traveling wave, which is refracted and reflected at the discontinuity of the bus impedance of the battery pack to produce high-frequency, high-energy, and high-amplitude transient waves, and then coupled to the controller of the high-voltage system such as the battery management system through conduction, induction or radiation to produce an impact, and because the AFE (analog front end) chip is relatively fragile in the battery management system, it will eventually affect the AFE chip. Therefore, the surge detection circuit of the embodiment of the present invention can be used for surge detection of the analog front end.

[0062] like Figure 1 As shown, the surge detection circuit 1000 according to the embodiment of the present invention includes: a magnetic induction module 1100 , an oscillation circuit module 1200 and a signal detection circuit module 1300 .

[0063] Among them, the magnetic induction module 1100 is used to collect surge magnetic induction signals; the oscillation circuit module 1200 is connected to the magnetic induction module 1100 and is used to generate an oscillation signal according to the surge magnetic induction signal; the signal detection circuit module 1300 is connected to the oscillation circuit module 1200 and is used to generate a surge detection signal according to the oscillation signal.

[0064] Specifically, surge refers to a peak value that exceeds the stable value in the circuit for a moment, also known as a sudden wave, which includes surge voltage and surge current. In essence, a surge is a violent pulse that occurs in just a few millionths of a second. Lightning strikes, short circuits, power switching, and the opening of heavy equipment can all cause surges. The surge magnetic induction signal can be understood as radiation or magnetic field changes caused by changes in the high-frequency energy of the surge, and the magnetic induction module can generate an induced electromotive force due to changes in magnetic flux or radiation coupling, that is, the surge magnetic induction signal is collected. When the magnetic induction module 1100 detects the surge magnetic induction signal, the surge detection circuit 1000 is activated, and the surge magnetic induction signal is transmitted to the vibration circuit module 1200.

[0065] After the oscillation circuit module 1200 receives the surge magnetic induction signal, the surge magnetic induction signal is converted into an oscillation signal due to the change of the surge magnetic induction signal, and the oscillation signal is transmitted to the signal detection circuit module 1300. After receiving the oscillation signal, the signal detection circuit module 1300 generates a surge detection signal, such as a high-level signal, according to the oscillation signal, and then determines whether the chip is subjected to a surge shock based on the output signal of the signal detection circuit module 1300.

[0066] According to the surge detection circuit of the embodiment of the present invention, the surge magnetic induction signal is collected by the magnetic induction module, the oscillation circuit module generates an oscillation signal according to the surge magnetic induction signal, and the signal detection circuit module generates a surge detection signal according to the oscillation signal and outputs the surge detection signal, thereby realizing active detection of surges, providing data support for chip fault analysis, providing evidence for determining that the chip fails due to surges, avoiding the assumption that the chip has design or manufacturing defects, and being more conducive to chip fault analysis and technical improvement.

[0067] In some embodiments, Figure 1 As shown, the surge detection circuit 1000 further includes: a signal maintaining circuit module 1400 .

[0068] The signal maintaining circuit module 1400 is connected to the signal detecting circuit module 1300 and is used to maintain the surge detection signal.

[0069] Specifically, since the surge time may be very short, a general surge detection circuit may not have enough time to detect and identify the surge. The present invention sets a signal maintaining circuit module 1400 in the surge detection circuit 1000, and the signal maintaining circuit module 1400 is connected to the signal detection circuit module 1300. After the signal detection circuit module 1300 generates a surge detection signal, the signal detection circuit module 1300 transmits the surge detection signal to the signal maintaining circuit module 1400, and the signal maintaining circuit module 1400 saves the surge detection signal to avoid not being able to identify the surge due to the very short surge time.

[0070] In some embodiments, Figure 1 As shown, the surge detection circuit 1000 further includes: a clearing circuit module 1500 .

[0071] The clearing circuit module 1500 is connected to the signal maintaining circuit module 1400 and is used to control the signal maintaining circuit module 1400 to reset in response to the surge detection signal clearing instruction.

[0072] Specifically, after receiving the surge detection signal sent by the signal detection circuit module 1300, the signal maintaining circuit module 1400 will always maintain the surge detection signal. If it is not processed, the surge detection circuit 1000 will not be able to detect the surge again when the next surge comes. Therefore, after reading the surge detection signal and determining that the chip is subjected to a surge, the surge detection signal needs to be cleared; after the clearing circuit module 1500 receives the surge detection signal clearing instruction, the signal maintaining circuit module 1400 is controlled to reset and clear the surge detection signal, and the surge detection circuit 1000 can continue to detect surges.

[0073] In some embodiments, Figure 1 As shown, the magnetic induction module 1100 includes: a magnetic induction component 1110 .

[0074] The magnetic induction component 1110 is led out from the magnetic induction port of the magnetic induction module 1100 through a wiring harness, and one end of the magnetic induction component 1110 is connected to the oscillation circuit module 1200 for sensing surge magnetic induction signals.

[0075] Specifically, to facilitate the collection of surge magnetic induction signals, the magnetic induction component 1110 is led out from the magnetic induction port of the magnetic induction module 1100 through a wiring harness. After the magnetic induction component 1110 senses the electromagnetic radiation of the surge, a surge magnetic induction signal is generated. The magnetic induction component 1110 sends the surge magnetic induction signal to the oscillation circuit module 1200 for subsequent processing of the surge magnetic induction signal.

[0076] In some embodiments, Figure 1 As shown, the magnetic induction component 1110 includes: a magnetic flux bundle 1111.

[0077] The first end of the magnetic flux bundle 1111 is connected to the oscillation circuit module 1200 , and the magnetic flux bundle 1111 is suitable for being wound around the target signal wire bundle to sense the surge magnetic flux signal of the target signal wire bundle.

[0078] Specifically, Figure 2 As shown, the specific implementation of the magnetic flux bundle 1111 can be that an induction wire is led out from the induction port of the magnetic induction module 1100, and then the wire can be wound around the target signal wire bundle, and the surge detection of different wire bundles can be realized by winding around different wire bundles. The magnetic flux bundle 1111 wound around the target signal wire bundle is equivalent to a coil. When the surge is transmitted to the chip through the magnetic flux bundle 1111, a changing magnetic flux will be generated due to the high-frequency high energy of the surge, and then the changing magnetic flux will generate an induced electromotive force on the magnetic flux bundle 1111. At this time, the magnetic induction module 1100 receives the surge magnetic induction signal and sends the surge magnetic induction signal to the oscillation circuit module 1200.

[0079] For example, the present invention can detect whether a specific wiring harness of the battery management system is impacted by the battery pack surge, so as to better assist the designer to further investigate the source of the battery pack surge. Because when an induction wire is used to lead out from the induction port of the present invention, the wire can be wound around the wiring harness of the battery management system, so that surge detection of different wiring harnesses can be achieved by winding around different wiring harnesses. The induction wires wound around these wiring harnesses are equivalent to a coil. When the surge is transmitted to the battery management system through the sampling wiring harness, a changing magnetic flux will be generated due to the high-frequency and high energy of the surge, and then the changing magnetic flux will generate an induced electromotive force on the coil. When the induced electromotive force is input into the chip of the present invention through the induction wire, the detection circuit will work. When all the connectors of the battery management system use a surge detection circuit of the present invention for surge detection, if only one of the connectors detects a surge impact when a surge occurs, it can be determined that the surge is transmitted from the connector, and then the source of the surge can be better analyzed by tracing the wire of the connector.

[0080] In some embodiments, Figure 3 As shown, the magnetic induction module 1100 includes: a magnetic induction coil 1120 .

[0081] The first end of the magnetic induction coil 1120 is connected to the oscillation circuit module 1200 , and the magnetic induction coil 1120 is disposed on a circuit board where the surge detection circuit 1000 is located to sense the surge magnetic induction signal.

[0082] Specifically, because the surge detection method of the present invention utilizes electromagnetic induction to generate induced electromotive force for detection, the magnetic induction coil 1120 can be arranged on the circuit board where the surge detection circuit 1000 is located, so as to sense the electromagnetic radiation of the surge to realize surge detection. After the magnetic induction coil 1120 senses the electromagnetic radiation of the surge, the magnetic induction module 1100 collects the surge magnetic induction signal and sends the surge magnetic induction signal to the oscillation circuit module 1200; since the magnetic induction coil 1200 is located on the circuit board, the surge signal on the circuit board can be sensed, but it is impossible to identify the specific location where the surge occurred.

[0083] For example, the magnetic induction coil 1120 can also realize its function by drawing multiple turns of layout routing on the circuit board. When multiple turns of routing are drawn on the circuit board, it is equivalent to placing an induction coil on the circuit board. In addition to affecting the controller through the wire harness conduction, the surge will also affect the controller through radiation coupling due to its high-frequency characteristics. The radiation signal of the surge will be received by the layout induction coil on the circuit board and generate an induced electromotive force on the induction coil. This induced electromotive force is then input into the magnetic induction module 1100 of the present invention to activate the surge detection circuit 1000.

[0084] In some embodiments, Figure 1 As shown, the magnetic induction module 1100 further includes: a first capacitor 1101 .

[0085] The first end of the first capacitor 1101 is connected to the first end of the magnetic induction element 1110 , and the second end of the first capacitor 1101 is connected to the oscillation circuit module 1200 for transmitting the surge magnetic induction signal.

[0086] Specifically, the first capacitor 1101 can be a high-voltage isolation capacitor to prevent the surge detection circuit 1000 from receiving irrelevant signals. After the magnetic induction component 1110 collects the surge magnetic induction signal, the surge magnetic induction signal is transmitted to the oscillation circuit module 1200 through the first capacitor 1101, so that the oscillation circuit module 1200 generates an oscillation signal according to the surge magnetic induction signal.

[0087] In some embodiments, Figure 1 As shown, the magnetic induction module 1100 further includes: a first resistor 1102 .

[0088] The first end of the first resistor 1102 is connected to the first end of the magnetic induction element 1110 and the first end of the first capacitor 1101 , and the second end of the first resistor 1102 is grounded.

[0089] Specifically, since the first resistor 1102 is located between the magnetic induction component 1110 and the ground terminal, the first resistor 1102 can provide a pull-down level for the magnetic induction module 1100, so that when there is no induced electromotive force, the level at the magnetic induction component 1110 is a low level. For example, the resistance of the first resistor 1102 is usually greater than 1MΩ.

[0090] In some embodiments, Figure 1 As shown, the oscillation circuit module 1200 includes: a first switch tube 1210 .

[0091] Among them, the first end of the first switch tube 1210 is connected to the power supply through the second resistor 1201, the second end of the first switch tube 1210 is grounded, the control end of the first switch tube 1210 is connected to the second end of the first capacitor 1101, and the first switch tube 1210 is used to turn on in response to the surge magnetic induction signal.

[0092] Specifically, the first end of the first switch tube 1210 is connected to the power supply through the second resistor 1201. The second resistor 1201 is a current limiting resistor, which reduces the current flowing from the power supply to the first switch tube 1210, thereby protecting the first switch tube 1210. Since the first end of the first switch tube 1210 is connected to the power supply and the second end of the first switch tube 1210 is grounded, the voltage at the first end of the first switch tube 1210 is higher than the voltage at the second end of the first switch tube 1210. The control end of the first switch tube 1210 is connected to the second end of the first capacitor 1101. When the magnetic induction component 1110 does not collect the surge magnetic induction signal, the control terminal voltage of the first switch tube 1210 is zero and is less than the first terminal voltage of the first switch tube 1210, so the first switch tube 1210 is closed; after the magnetic induction component 1110 collects the surge magnetic induction signal, the magnetic induction module 1100 transmits the surge magnetic induction signal to the control terminal of the first switch tube 1210 in the oscillation circuit module 1200 through the first capacitor 1101. At this time, the control terminal voltage of the first switch tube 1210 is greater than the first terminal voltage of the first switch tube 1210, and the first switch tube 1210 is turned on.

[0093] In some embodiments, Figure 1 As shown, the oscillation circuit module 1200 includes: a second switch tube 1220 .

[0094] Among them, the first end of the second switch tube 1220 is connected to the power supply through the third resistor 1202, the second end of the second switch tube 1220 is grounded through the fourth resistor 1203, the control end of the second switch tube 1220 is connected to the first end of the first switch tube, and the second switch tube 1220 is used to switch from the on state to the off state when the first switch tube 1210 is turned on; when there is a surge magnetic induction signal, the switching state change of the first switch tube 1210 and the second switch tube 1220 causes the first end of the second switch tube 1220 to generate an oscillation signal.

[0095] Specifically, a first end of the second switch tube 1220 is connected to the power supply through a third resistor 1202, and the third resistor 1202 is a current limiting resistor, which reduces the current flowing from the power supply to the second switch tube 1220, thereby protecting the second switch tube 1220; a second end of the second switch tube 1220 is grounded through a fourth resistor 1203, and the fourth resistor 1203 is used to pull down the current flowing through the first capacitor 1101; when the magnetic induction component 1110 does not collect the surge magnetic induction signal, the first switch tube 1210 is disconnected, and since the control end of the second switch tube 1220 is connected to the power supply, the control end of the second switch tube 1220 is at a high level and the second switch tube 1220 is turned on, and when the magnetic induction component 1110 collects the surge magnetic induction signal, the control end of the first switch tube 1210 receives the surge magnetic induction signal sent by the magnetic induction module 1100. The first switch tube 1210 is turned on. After the first switch tube 1210 is turned on, since the second end of the first switch tube 1210 is grounded, the voltage at the first end of the first switch tube 1210 becomes 0V, and the voltage at the control end of the second switch tube 1220 also becomes 0V, and the second switch tube 1220 is turned off. After the second switch tube 1220 is turned off, the fourth resistor 1203 pulls down the voltage, and the control end of the first switch tube 1210 is pulled to 0V, and the first switch tube 1210 changes from being turned on to being turned off; when the first switch tube 1210 is turned off, the voltage at the control end of the second switch tube 1220 becomes high, and the second switch tube 1220 is turned on again. After the second switch tube 1220 is turned on, the voltage at the control end of the first switch tube 1210 becomes high, and the first switch tube 1210 is turned on again, and this cycle is repeated, so that the first end of the second switch tube 1220 generates an oscillation signal.

[0096] In some embodiments, Figure 1 As shown, the oscillation circuit module 1200 includes: a second capacitor 1204 .

[0097] The first end of the second capacitor 1204 is connected to the control end of the first switch tube 1210 and the second end of the second switch tube 1220 for absorbing the oscillation signal.

[0098] Specifically, after the magnetic induction module 1100 transmits the surge magnetic induction signal to the oscillation circuit module 1200, the first switch tube 1210 and the second resistor 1201 are disconnected or closed in response to the surge magnetic induction signal, so as to generate an oscillation signal at the first end of the second switch tube 1220, and the second capacitor 1204 is used to absorb the oscillation signal, thereby eventually making the oscillation circuit tend to be stationary.

[0099] For example, the first switch tube 1210 and the second switch tube 1220 are NPN transistors, the second resistor 1201, the third resistor 1202 and the fourth resistor 1203 are current limiting resistors of the first switch tube 1210 and the second resistor 1201, and the second capacitor 1204 is a filter capacitor. The function of this capacitor is to prevent the surge detection function of the chip from being too sensitive. Increasing the capacitance of the second capacitor 1204 can reduce the sensitivity of surge detection; the first switch tube 1210, the second switch 1220, the second resistor 1201, the third resistor 1202 and the fourth resistor 1203 form an oscillation circuit. When the base of the first switch tube 1210 has no level, the entire oscillation circuit is in a mutually balanced static state. When the magnetic induction element 1110 senses the change in the magnetic flux of electromagnetic radiation, an induced electromotive force will be generated. When there is no surge, the level of the chip's induction pin is 0V due to the pull-down of the first resistor 1102. After the magnetic induction element 1110 generates an induced electromotive force, the level of the chip's induction pin is no longer 0V, so the chip's induction pin has a level change. The changed level is an AC signal, which can enter the base of the first switch tube 1210 of the oscillation circuit through the first capacitor 1101 high-voltage isolation capacitor. When the level of the base of the first switch tube 1210 is high, the first switch tube 1210 is turned on, and the collector and emitter of the first switch tube 1210 are turned on, so the collector voltage of the first switch tube 1210 is 0V, that is, the base of the second switch tube 1220 is also 0V, and the state of the second switch tube 1220 changes from the original on to off. When the second switch tube 1220 is disconnected, the base level of the first switch tube 1210 is also pulled to 0V due to the pull-down of the fourth resistor 1203, and the state of the first switch tube 1210 changes from on to off. When the first switch tube 1210 is disconnected, the base of the second switch tube 1220 will become a high level again, so the second switch tube 1220 will change from off to on, and then the base of the first switch tube 1210 will become a high level again. This cycle will generate a changing voltage at the collector of the second switch tube 1220 until the oscillation level is slowly absorbed by the filtering of the second capacitor 1204, and finally the oscillation circuit tends to be static.

[0100] In some embodiments, Figure 1 As shown, the signal detection circuit module 1300 includes: a rectifying and filtering unit 1310 and a third switch tube 1320 .

[0101] Among them, the first end of the rectification and filtering unit 1310 is connected to the first end of the second switching tube 1220, and the second end of the rectification and filtering unit 1310 is grounded, which is used to obtain the forward voltage signal in the oscillation signal; the first end of the third switching tube 1320 is connected to the power supply, the second end of the third switching tube 1320 is grounded, and the control end of the third switching tube 1320 is connected to the third end of the rectification and filtering unit 1310, which is used to be turned on in response to the forward voltage signal to output a surge detection signal.

[0102] Specifically, the first end of the rectifying and filtering unit 1310 is connected to the first end of the second switching tube 1220, and receives the oscillation signal generated by the first end of the second switching tube 1220. The third end of the rectifying and filtering unit 1310 is connected to the control end of the third switching tube 1320. After the rectifying and filtering unit 1310 obtains the forward voltage signal in the oscillation signal, the rectifying and filtering unit 1310 transmits the forward voltage signal to the control end of the third switching tube 1320. The control end of the third switching tube 1320 is turned on after receiving the forward voltage signal, and outputs a surge detection signal.

[0103] In some embodiments, Figure 1 As shown, the rectifying and filtering unit 1310 includes: a third capacitor 1311 and a first diode 1312 .

[0104] Among them, the first end of the third capacitor 1311 is connected to the first end of the second switch tube 1220, and the second end of the third capacitor 1311 is connected to the control end of the third switch tube 1320; the positive end of the first diode 1312 is grounded, and the negative end of the first diode 1312 is connected to the second end of the third capacitor 1311 and the control end of the third switch tube 1320.

[0105] Specifically, the third capacitor 1311 is connected to the first end of the second switch tube 1220, and is used to receive an oscillation signal generated by the first end of the second switch tube 1220. The oscillation signal can be transmitted to the third switch tube 1320 through the third capacitor 1311 as an AC signal. The first diode 1312 is connected between the ground end and the third capacitor 1311, and unidirectional conduction can block the oscillation signal.

[0106] For example, the third capacitor 1311, as a capacitor, has the function of passing AC and blocking DC, so when the oscillation circuit is stationary, since the collector of the second switch tube 1220 is at a continuous high level, the continuous high level as a DC signal cannot pass through the third capacitor 1311. After the oscillation circuit oscillates, due to the frequent on and off of the second switch tube 1220, the electrical frequency of the collector of the second switch tube 1220 is high level and low level, so an oscillating voltage is formed. The oscillating voltage can reach the third switch tube 1320 through the third capacitor 1311 as an AC signal. The third capacitor 1311 and the first diode 1312 form a rectifier filter circuit, so that the forward voltage can reach the base of the third switch tube 1320. When the base of the third switch tube 1320 receives a high level, the third switch tube 1320 will be turned on, and the collector and emitter of the third switch tube 1320 will be turned on, and the surge detection signal will be transmitted to the signal maintenance circuit module 1400.

[0107] In some embodiments, Figure 1 As shown, the signal detection circuit module 1300 includes: a fourth capacitor 1301 .

[0108] The first end of the fourth capacitor 1301 is connected to the second end of the third switch tube 1320 , and the second end of the fourth capacitor 1301 is grounded.

[0109] Specifically, the fourth capacitor 1301 is connected between the third switch tube 1320 and the ground terminal. After the third switch tube 1320 sends a surge detection signal, the fourth capacitor 1301 absorbs the surge detection signal until the signal detection circuit module 1300 becomes stationary.

[0110] In some embodiments, Figure 1 As shown, the signal maintaining circuit module 1400 includes: a fourth switch tube 1410 and a fifth switch tube 1420 .

[0111] Among them, the first end of the fourth switch tube 1410 is connected to the power supply through the fifth resistor 1401, the second end of the fourth switch tube 1410 is grounded, the control end of the fourth switch tube 1410 is connected to the second end of the third switch tube 1320, and the fourth switch tube 1410 is used to be turned on in response to the surge detection signal; the first end of the fifth switch tube 1420 is grounded through the sixth resistor 1402, the second end of the fifth switch tube 1420 is connected to the power supply through the seventh resistor 1403, the control end of the fifth switch tube 1420 is connected to the first end of the fourth switch tube 1410, and the fifth switch tube 1420 is used to switch to the on state in response to the conduction of the fourth switch tube 1410, so that the control end of the fourth switch tube 1410 maintains the level of the surge detection signal.

[0112] Specifically, after the control end of the fourth switch tube 1410 receives the surge detection signal of the third switch tube 1320, the fourth switch tube 1410 is turned on, and current can flow to the ground end through the fourth switch tube 1410; when the fourth switch tube 1410 is not turned on, the control end of the fifth switch tube 1420 has a higher voltage connected to the power supply. After the fourth switch tube 1410 is turned on, the voltage at the control end of the fifth switch tube 1420 decreases, and the fifth switch tube 1420 is turned on. The current at the power supply end can flow to the control end of the fourth switch tube 1410 through the fifth switch tube 1420, so that the control end of the fourth switch tube 1410 is maintained at the level of the surge detection signal.

[0113] For example, the fourth switch tube 1410, the fifth resistor 1401, the fifth switch tube 1420, the sixth resistor 1402 and the seventh resistor 1403 form a signal holding circuit. When the third switch tube 1320 is not turned on, since the base of the fourth switch tube 1410 is pulled down by the sixth resistor 1402, the base level of the fourth switch tube 1410 is 0V, and the fourth switch tube 1410 is not turned on. Since the fifth switch tube 1420 is a PNP type triode, the fifth switch tube 1420 is disconnected when the base of the fifth switch tube 1420 is at a high level. When the third switch tube 1320 is turned on due to the operation of the previous oscillation circuit, the four switch tubes 1410 are turned on, resulting in the base of the fifth switch tube 1420 being at a low level, so the fifth switch tube 1420 will be turned on. Since the fifth switch tube 1420 is turned on to keep the base of the four-switch tube 1410 at a high level, even if the surge disappears and causes the third switch tube 1320 to be turned off, the base of the four-switch tube 1410 can be kept at a high level to maintain the surge detection signal.

[0114] In some embodiments, Figure 1 As shown, the signal maintaining circuit module 1400 includes: a fifth capacitor 1404 and a sixth capacitor 1405 .

[0115] Specifically, the first end of the fifth capacitor 1404 is connected to the control end of the fifth switch tube 1420, and the second end of the fifth capacitor 1404 is connected to the control end of the fourth switch tube 1410; the first end of the sixth capacitor 1405 is connected to the control end 1410 of the fourth switch tube, and the second end of the sixth capacitor 1405 is grounded. The fifth capacitor 1404 and the sixth capacitor 1405 are used to filter the surge detection signal and eliminate interference and clutter signals.

[0116] In some embodiments, Figure 1 As shown, the clearing circuit module 1500 includes: a sixth switch tube 1510 .

[0117] Among them, the first end of the sixth switch tube 1510 is connected to the second end of the fifth switch tube 1420, the second end of the sixth switch tube 1510 is grounded, the control end of the sixth switch tube 1510 is used to receive the surge detection signal reset instruction, and the sixth switch tube 1510 is used to respond to the surge detection signal reset instruction control signal to maintain the circuit module 1400 reset.

[0118] Specifically, the signal maintaining circuit module 1400 can always maintain the surge detection signal, so it is impossible to detect subsequent surges. Therefore, after recording the surge detection signal, the signal maintaining circuit module 1400 should be cleared to eliminate the surge detection signal; when the signal maintaining circuit module 1400 needs to be reset, the clearing circuit module 1500 sends a surge detection signal clearing instruction, and after the control end of the sixth switch tube 1510 receives the surge detection signal clearing instruction, the sixth switch tube 1510 is turned on. After the sixth switch tube 1510 is turned on, the fourth switch tube 1410 and the fifth switch tube 1420 are disconnected, and the surge detection signal disappears.

[0119] For example, since the fourth switch tube 1410, the fifth resistor 1401, the fifth switch tube 1420, the sixth resistor 1402 and the seventh resistor 1403 can keep the surge detection signal all the time, if it is not processed, it cannot be detected again when the next battery pack surge comes, so the role of the sixth switch tube 1510 is to clear the maintained surge detection signal after the chip reads the surge detection result. The specific measure is that when the chip passes the detection of the surge detection result, the reset circuit module 1500 outputs a high level, and the six switch tubes 1510 will be turned on after the base is high. After the six switch tubes 1510 are turned on, the emitter of the fifth switch tube 1420 will be low, so the fifth switch tube 1420 will change from the on state to the off state, so the base of the fourth switch tube 1410 will become low again because it is pulled down by the sixth resistor 1402, and the fourth switch tube 1410 will change from on to off, and the signal holding circuit will be reset.

[0120] In some embodiments, Figure 1 As shown, the surge detection circuit 1000 further includes: a signal acquisition circuit module 1600 .

[0121] The signal acquisition circuit module 1600 is connected to the second end of the third switch tube 1320 and the control end of the fourth switch tube 1410 , and is used to acquire the surge detection signal in response to the signal acquisition instruction and convert the surge detection signal into a digital signal.

[0122] Specifically, the control end of the fourth switch tube 1410 maintains the surge detection signal. When the chip needs to obtain the packet surge detection result, the signal acquisition circuit module 1600 can be used to detect the level of the control end of the fourth switch tube 1410 to make a judgment. The signal acquisition circuit module 1600 is provided with an analog-to-digital converter to convert the surge detection signal from a voltage signal to a digital signal. When the control end of the fourth switch tube 1410 is at a low level, it indicates that no surge signal is detected. When the control end level of the fourth switch tube 1410 is at a high level, it indicates that a surge signal is detected. When the signal acquisition circuit module 1600 collects the surge detection signal and determines that a surge has occurred, if it is necessary to detect the surge again, the signal clearing module 1500 can output a high level to reset the signal maintaining circuit module 1400, and the surge detection starts again.

[0123] The present invention can detect surges of high-voltage connectors and low-voltage connectors, and is not limited by the level of a specific circuit. Because the present invention utilizes the induced electromotive force generated by surge electromagnetic radiation, which is then isolated by a high-voltage capacitor inside the chip before being sent to the detection circuit of the present invention, there is no need to worry about the influence of high and low voltage levels with the isolation of the high-voltage capacitor, and the use is not restricted.

[0124] The surge detection circuit 1000 of the embodiment of the present invention is applied to the analog front end. The circuit composed of the first switch tube 1210, the second switch tube 1220, the third switch tube 1320, the fourth switch tube 1410, the fifth switch tube 1420, the sixth switch tube 1510 and other resistors and capacitors is to detect the surge of the battery pack by electromagnetic induction. The function of the signal acquisition circuit module 1600 is to read the surge detection result and convert the result of the analog signal into a digital signal. The function of the zeroing circuit module 1500 is to clear the detection result and reset the circuit to wait for the next surge after the analog-to-digital converter of the signal acquisition circuit module 1600 reads the detection result. Other modules are analog systems such as analog-to-digital converters, amplifiers, reference sources, excitation circuits, modulation and demodulation circuits, etc. that are available in existing analog front ends. The magnetic flux bundle 1111 is used to absorb interference electromagnetic waves in space and conduct them to the surge detection circuit 1000 of the present invention.

[0125] The second aspect of the present invention provides an analog front end, such as Figure 4 As shown, the analog front end 200 includes: a surge detection circuit 1000 .

[0126] According to the analog front end of the embodiment of the present invention, a surge detection circuit inside the analog front end is used to detect whether the analog front end is subjected to a surge. When the analog front end fails due to a surge, a surge detection signal is output to provide data support for the fault analysis of the analog front end and provide evidence for determining that the analog front end fails due to a surge.

[0127] The third aspect of the present invention provides a battery management system, such as Figure 5 As shown, the battery management system 300 includes: an analog front end 200 and a main control chip 310 .

[0128] The main control chip 310 is connected to the analog front end 200 .

[0129] According to the battery management system of the embodiment of the present invention, the main control chip is connected to the analog front end, and the main control chip controls the analog front end to detect whether the battery management system is subjected to a surge during operation. When it is detected that the battery management system is subjected to a surge, the surge detection circuit in the analog front end outputs a surge detection signal to detect the surge in the battery management system, thereby providing data support for determining the cause of the battery management system failure due to the surge, and facilitating fault analysis and technical improvements on the main control chip.

[0130] In some embodiments, Figure 5 As shown, the battery management system 300 further includes: a surge passive protection module 320 .

[0131] The passive surge protection module 320 is located at the signal port of the analog front end 200 .

[0132] Specifically, when a surge occurs, the signal is first transmitted to the analog front end 200 through the passive surge protection module 320. The passive surge protection module 320 plays a role in passively defending against surges and absorbing surge energy. When the surge energy is too large to be completely absorbed by the passive surge protection module 320, the surge detection circuit 1000 in the analog front end 200 detects the surge and sends a surge detection signal.

[0133] In some embodiments, Figure 1 As shown, the passive surge protection module 320 includes: a seventh capacitor 321 and a voltage stabilizing diode 322 .

[0134] The first end of the seventh capacitor 321 is connected to the power supply, and the second end of the seventh capacitor 321 is grounded; the positive terminal of the Zener diode 322 is grounded, and the negative terminal of the Zener diode 322 is connected to the power supply.

[0135] Specifically, the seventh capacitor 321 is used to absorb surge energy when a surge occurs, and the Zener diode 322 clamps and absorbs the surge. Once the surge energy exceeds the power that the Zener diode 322 can withstand, the Zener diode 322 will be broken down, and the analog front end 200 and other circuits in the battery management system 300 will lose protection and cause failure and damage. Therefore, when the surge energy is too large to be completely absorbed by the seventh capacitor 321 and the Zener diode 322, the surge detection circuit 1000 in the analog front end 200 detects the surge and sends a surge detection signal.

[0136] Reference below Figure 6 A surge detection method according to an embodiment of the fourth aspect of the present invention is described as follows: Figure 6 As shown, the method at least includes steps S1 to S3.

[0137] Step S1, obtaining a surge detection signal detected by a surge detection circuit of an analog front end.

[0138] Specifically, after the analog front end is hit by a surge, the surge detection circuit of the analog front end detects the surge, the signal maintenance circuit module in the surge detection circuit sends a surge detection signal, and the main control chip obtains the surge detection signal in real time. If the main control chip does not obtain the surge detection signal, it means that the analog front end is not hit by a surge. After the main control chip obtains the surge detection signal, it means that the analog front end is hit by a surge.

[0139] Step S2, determining that a surge fault occurs in the battery management system according to the surge detection signal.

[0140] Specifically, the main control chip in the battery management system obtains the signal in the surge detection circuit in real time and the circuit module sends a surge detection signal. After the main control chip obtains the surge detection signal, it determines that the analog front end is subjected to a surge impact and a surge failure occurs in the battery management system, and the battery management system needs to be inspected and maintained.

[0141] Step S3: issuing an alarm prompt according to the surge fault.

[0142] Specifically, after a surge fault occurs in the battery management system, the main control chip issues an alarm prompt. For example, the main control chip can control a buzzer to issue a sound prompt, or the main control chip can be connected to a display module to display the surge fault on the display module.

[0143] For example, in the operation of the battery management system, the main control chip will control the reset circuit module of the surge detection circuit in the analog front end through instructions to output a pulse high level so that the signal maintenance circuit module clears the fault state and waits for the surge to occur. The magnetic induction module continuously senses the surrounding electromagnetic radiation. When no surge electromagnetic radiation is detected, it repeats the detection. When the electromagnetic radiation generated by the surge is detected, the surge magnetic induction signal will be introduced into the oscillation circuit module. The oscillation circuit module will enter the oscillation state due to the imbalance caused by the surge magnetic induction signal from the original relatively balanced static state. After the oscillation circuit in the oscillation circuit module starts to oscillate, the oscillation signal will be transmitted to the signal detection circuit module, and a surge detection signal will be generated according to the oscillation signal. The signal maintenance circuit module maintains the surge detection signal. When there is no surge detection signal, the signal maintenance circuit module outputs a low level. When the signal maintenance circuit module maintains the surge detection signal, the signal maintenance circuit module outputs a high level. The main control chip reads the surge detection result of the signal acquisition circuit module through instructions. When the surge detection result is valid, the main control chip sends a fault alarm signal to the vehicle or user.

[0144] According to the surge detection method of the embodiment of the present invention, a surge detection circuit is used to detect whether the battery management system is subjected to a surge impact. After the battery management system is subjected to a surge impact, the surge detection circuit outputs a surge detection signal, determines that a surge fault occurs in the battery management system, and issues an alarm, thereby determining that the battery management system fails due to a surge, thereby facilitating fault analysis of the battery management system.

[0145] In some embodiments, the surge detection method further includes: after determining that a surge fault occurs in the battery management system, sending a surge detection signal clearing instruction to the surge detection circuit, so that the surge detection circuit clears the current surge detection signal.

[0146] Specifically, after a surge fault occurs in the battery management system, the signal maintaining circuit module in the surge detection circuit can always maintain the surge detection signal, so that subsequent surges cannot be detected. Therefore, after recording the surge detection signal, the signal maintaining circuit module should be cleared to eliminate the surge detection signal; the main control chip controls the clearing circuit module to send a surge detection signal clearing instruction, and the surge detection circuit clears the current surge detection signal, so that the surge detection circuit can continue to detect the occurrence of surges.

[0147] Reference below Figure 7 The surge detection steps of the embodiment of the present invention are described by way of example, and the specific contents are as follows.

[0148] Step S4, power on the chip.

[0149] Step S5, the main control chip controls the analog front-end signal clearing module to clear the signal to maintain the circuit state.

[0150] Step S6, whether a surge occurs, if yes, go to step S7, otherwise go to step S5.

[0151] Step S7, the oscillation circuit is unbalanced and starts to oscillate.

[0152] Step S8: The signal holding circuit holds the state where the surge is detected.

[0153] Step S9: the main control chip reads the surge detection result through the signal acquisition circuit module and issues an alarm.

[0154] A fifth aspect of the present invention provides an electronic device, such as Figure 8 As shown, the electronic device 400 includes: at least one processor 401 and a memory 402 .

[0155] The processor 401 and the memory 402 are in communication connection, the memory 402 stores a computer program that can be executed by at least one processor 401 , and the surge detection method is implemented when at least one processor 401 executes the computer program.

[0156] According to the electronic device of the embodiment of the present invention, the corresponding surge detection program can be stored in the memory. When the surge detection method is implemented, the processor runs the program in the memory, so that the magnetic induction module in the surge detection circuit collects the surge magnetic induction signal, generates an oscillation signal according to the surge magnetic induction signal, and finally outputs the surge detection signal, thereby realizing active detection and active reporting of surge faults.

[0157] A sixth aspect of the present invention provides a vehicle, such as Fig. 9 As shown, the vehicle 500 includes: a battery pack 501 and a battery management system 300 .

[0158] The analog front end 200 of the battery management system 300 is connected to the battery pack 501 .

[0159] According to the vehicle of the embodiment of the present invention, an analog front end is set in the battery management system to detect whether the battery management system is subjected to a surge impact caused by the battery pack during operation. After detecting that the battery management system is subjected to a surge impact, the surge detection circuit in the analog front end outputs a surge detection signal, thereby providing data support for determining the cause of the battery management system failure, thereby facilitating fault analysis and technical improvement of the battery management system.

[0160] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0161] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A surge detection circuit, characterized in that: include: Magnetic induction module, used to collect surge magnetic induction signals; an oscillation circuit module, connected to the magnetic induction module, and configured to generate an oscillation signal according to the surge magnetic induction signal; The signal detection circuit module is connected to the oscillation circuit module and is used to generate a surge detection signal according to the oscillation signal.

2. The surge detection circuit according to claim 1, characterized in that: The surge detection circuit further includes: The signal maintaining circuit module is connected to the signal detecting circuit module and is used to maintain the surge detection signal.

3. The surge detection circuit according to claim 2, characterized in that: The surge detection circuit further includes: The reset circuit module is connected to the signal maintaining circuit module and is used to control the signal maintaining circuit module to reset in response to a surge detection signal reset instruction.

4. The surge detection circuit according to claim 3, characterized in that: The magnetic induction module comprises: A magnetic induction component is led out from the magnetic induction port of the magnetic induction module through a wiring harness, and one end of the magnetic induction component is connected to the oscillation circuit module for sensing surge magnetic induction signals.

5. The surge detection circuit according to claim 4, characterized in that: The magnetic induction component comprises: A magnetic induction harness, wherein a first end of the magnetic induction harness is connected to the oscillation circuit module, and the magnetic induction harness is suitable for being wound around a target signal harness to sense a surge magnetic induction signal obtained by the target signal harness.

6. The surge detection circuit according to claim 4, characterized in that: The magnetic induction module comprises: A magnetic induction coil, wherein a first end of the magnetic induction coil is connected to the oscillation circuit module, and the magnetic induction coil is arranged on a circuit board where the surge detection circuit is located to sense a surge magnetic induction signal.

7. The surge detection circuit according to claim 4, characterized in that: The magnetic induction module also includes: A first capacitor, wherein a first end of the first capacitor is connected to a first end of the magnetic induction component, and a second end of the first capacitor is connected to the oscillation circuit module, and is used to transmit the surge magnetic induction signal.

8. The surge detection circuit according to claim 4, characterized in that: The magnetic induction module also includes: A first resistor, wherein a first end of the first resistor is connected to a first end of the magnetic induction element and a first end of the first capacitor, and a second end of the first resistor is grounded.

9. The surge detection circuit according to claim 7, characterized in that: The oscillation circuit module comprises: A first switch tube, wherein a first end of the first switch tube is connected to a power supply through a second resistor, a second end of the first switch tube is grounded, a control end of the first switch tube is connected to a second end of the first capacitor, and the first switch tube is used to be turned on in response to the surge magnetic induction signal.

10. The surge detection circuit according to claim 9, characterized in that: The oscillation circuit module also includes: a second switch tube, wherein a first end of the second switch tube is connected to the power supply through a third resistor, a second end of the second switch tube is grounded through a fourth resistor, a control end of the second switch tube is connected to the first end of the first switch tube, and the second switch tube is used to switch from an on state to an off state when the first switch tube is turned on; Wherein, when there is a surge magnetic induction signal, the switch states of the first switch tube and the second switch tube change so that the first end of the second switch tube generates an oscillation signal.

11. The surge detection circuit according to claim 10, characterized in that: The oscillation circuit module also includes: A second capacitor, wherein a first end of the second capacitor is connected to the control end of the first switch tube and a second end of the second switch tube, and is used to absorb the oscillation signal.

12. The surge detection circuit according to claim 10, characterized in that: The signal detection circuit module comprises: A rectifying and filtering unit, wherein a first end of the rectifying and filtering unit is connected to a first end of the second switch tube, and a second end of the rectifying and filtering unit is grounded, and is used to obtain a forward voltage signal in the oscillation signal; A third switch tube, wherein a first end of the third switch tube is connected to the power supply, a second end of the third switch tube is grounded, and a control end of the third switch tube is connected to a third end of the rectifier and filter unit, and is used for being turned on in response to the forward voltage signal to output the surge detection signal.

13. The surge detection circuit according to claim 12, characterized in that: The rectification and filtering unit comprises: A third capacitor, wherein a first end of the third capacitor is connected to the first end of the second switch tube, and a second end of the third capacitor is connected to the control end of the third switch tube; A first diode, wherein a positive terminal of the first diode is grounded, and a negative terminal of the first diode is connected to the second terminal of the third capacitor and the control terminal of the third switch tube.

14. The surge detection circuit according to claim 12, characterized in that: The signal detection circuit module also includes: A fourth capacitor, wherein a first end of the fourth capacitor is connected to the second end of the third switch tube, and a second end of the fourth capacitor is grounded.

15. The surge detection circuit according to claim 12, characterized in that: The signal maintenance circuit module includes: a fourth switch tube, wherein a first end of the fourth switch tube is connected to a power source through a fifth resistor, a second end of the fourth switch tube is grounded, a control end of the fourth switch tube is connected to the second end of the third switch tube, and the fourth switch tube is used to be turned on in response to the surge detection signal; A fifth switch tube, wherein the first end of the fifth switch tube is grounded through a sixth resistor, the second end of the fifth switch tube is connected to the power supply through a seventh resistor, the control end of the fifth switch tube is connected to the first end of the fourth switch tube, and the fifth switch tube is used to switch to a conducting state in response to the conduction of the fourth switch tube, so that the control end of the fourth switch tube maintains the level of the surge detection signal.

16. The surge detection circuit according to claim 15, characterized in that: The signal maintaining circuit module also includes: a fifth capacitor, wherein a first end of the fifth capacitor is connected to the control end of the fifth switch tube, and a second end of the fifth capacitor is connected to the control end of the fourth switch tube; A sixth capacitor, wherein a first end of the sixth capacitor is connected to the control end of the fourth switch tube, and a second end of the sixth capacitor is grounded.

17. The surge detection circuit according to claim 15, characterized in that: The zeroing circuit module comprises: A sixth switch tube, wherein the first end of the sixth switch tube is connected to the second end of the fifth switch tube, the second end of the sixth switch tube is grounded, the control end of the sixth switch tube is used to receive the surge detection signal reset instruction, and the sixth switch tube is used to control the signal maintenance circuit module to reset in response to the surge detection signal reset instruction.

18. The surge detection circuit according to claim 12, characterized in that: The surge detection circuit further includes: A signal acquisition circuit module is connected to the second end of the third switch tube and the control end of the fourth switch tube, and is used to collect the surge detection signal in response to a signal acquisition instruction and convert the surge detection signal into a digital signal.

19. An analog front end, characterized in that: The invention comprises a surge detection circuit as described in any one of claims 1 to 18.

20. A battery management system, characterized in that: include: The analog front end of claim 19; A main control chip is connected to the analog front end.

21. The battery management system according to claim 20, characterized in that: The battery management system further comprises: A surge passive protection module is located at the signal port of the analog front end.

22. The battery management system according to claim 21, characterized in that: The passive surge protection module comprises: a seventh capacitor, wherein a first end of the seventh capacitor is connected to a power source, and a second end of the seventh capacitor is grounded; A voltage stabilizing diode, wherein the positive terminal of the voltage stabilizing diode is grounded, and the negative terminal of the voltage stabilizing diode is connected to the power supply.

23. A surge detection method, characterized in that: For a battery management system according to any one of claims 20 to 22, the surge detection method comprises: Acquire a surge detection signal detected by a surge detection circuit of an analog front end; Determining, according to the surge detection signal, that a surge fault occurs in the battery management system; An alarm is issued according to the surge fault.

24. The surge detection method according to claim 23, characterized in that: The surge detection method further comprises: After determining that a surge fault occurs in the battery management system, a surge detection signal clearing instruction is sent to the surge detection circuit, so that the surge detection circuit clears the surge detection signal of this time.

25. An electronic device, characterized in that: include: at least one processor; a memory communicatively coupled to the at least one processor; The memory stores a computer program that can be executed by the at least one processor, and the at least one processor implements the surge detection method of claim 23 or 24 when executing the computer program.

26. A vehicle, characterized in that: include: Battery pack; The battery management system according to any one of claims 20-22, wherein the analog front end of the battery management system is connected to the battery pack.

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