CN216134290U

CN216134290U - Low-voltage power supply network protection circuit and vehicle

Info

Publication number: CN216134290U
Application number: CN202121973964.6U
Authority: CN
Inventors: 张耀灵
Original assignee: Beijing CHJ Automotive Information Technology Co Ltd
Current assignee: Beijing CHJ Automotive Information Technology Co Ltd
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2022-03-25
Anticipated expiration: 2031-08-20

Abstract

The invention relates to a low-voltage power supply network protection circuit and a vehicle, wherein the low-voltage power supply network protection circuit comprises a first power supply end, a plurality of second power supply ends and a plurality of power supply control modules, the power supply control modules are arranged in a one-to-one correspondence manner with the second power supply ends, and the power supply control modules are respectively electrically connected with the first power supply ends and the corresponding second power supply ends; the power control module comprises at least one switch control branch which is connected between the first power supply end and the corresponding second power supply end in series. Through the technical scheme, the problem of mutual influence between the fault power supply and the non-fault power supply is avoided, and the power supply characteristic of the low-voltage power supply network is optimized.

Description

Low-voltage power supply network protection circuit and vehicle

Technical Field

The disclosure relates to the technical field of vehicles, in particular to a low-voltage power supply network protection circuit and a vehicle.

Background

With the development of the automobile industry, the intelligent level of a new energy automobile is higher and higher, the power supply requirement of the new energy automobile on a whole automobile low-voltage power supply network is higher and higher, and even no fault is allowed to occur in the low-voltage power supply network, so that at present, part of the whole automobile low-voltage power supply network adopts a multi-path power supply redundancy design, namely, a multi-path power supply is arranged to supply power to a load.

When the prior multi-path power supply supplies power to a load, because different power supplies have charging relations, the multi-path power supply simultaneously has a connection relation, so that when one or more power supplies are in short circuit abnormality, other power supplies also have faults due to the connection relation with a fault power supply, the multi-path power supplies mutually influence each other, the real-time power supply to a vehicle cannot be ensured, and the normal running of the vehicle is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a low-voltage power supply network protection circuit and a vehicle, which avoid the problem of mutual influence between a failed power supply and an un-failed power supply and optimize the power supply characteristics of a low-voltage power supply network.

In a first aspect, an embodiment of the present disclosure provides a low-voltage power supply network protection circuit, including:

the power supply control module is arranged in one-to-one correspondence with the second power supply end and is respectively and electrically connected with the first power supply end and the corresponding second power supply end;

the power control module comprises at least one switch control branch, and the switch control branch is connected between the first power end and the corresponding second power end in series.

Optionally, the first dc conversion power supply is electrically connected to the first power supply end and the power supply, respectively, and the second power supply end is electrically connected to the second dc conversion power supply or the battery.

Optionally, a connection node of the first dc conversion power supply and the power supply is electrically connected to at least one first load, and a first switch is connected in series between the connection node and the first load;

a connection node of the first direct-current conversion power supply and the first power supply end is electrically connected with at least one second load, and a second switch is connected between the connection node and the second load in series;

and the second power supply end and a connection node of the second direct-current conversion power supply or the storage battery are electrically connected with at least one third load, and a third switch is connected between the connection node and the third load in series.

Optionally, the first load comprises at least one of a kick sensor or a door handle;

the second load comprises at least one of a kick sensor or a door handle;

the third load comprises at least one of a motor controller, a generator controller, an engine controller, an electric power steering system, an active safety belt module, a vehicle body electronic stabilizing system, an electromechanical servo main power mechanism system, an air suspension, a combined switch assembly, a front lamp tube module, a tire pressure monitoring module, a motor water pump, a battery water pump, a fan, an electronic expansion valve, a blower or an electric charging port cover.

Optionally, the switch control branch comprises at least one fourth switch, and the at least one fourth switch is sequentially connected in series to form the switch control branch.

Optionally, the switch control branch includes a plurality of the fourth switches, and at least two of the fourth switches form a back-to-back transistor structure.

Optionally, the power control module further includes a controller, and the controller is electrically connected to the corresponding switch control branch;

the first sampling end of the controller is electrically connected with the first power supply end, and the second sampling end of the controller is electrically connected with the corresponding second power supply end.

Optionally, the switch control branch further comprises an impedance sampling element, and the impedance sampling element is connected in series in the switch control branch;

the controller comprises at least one current sensor, wherein a first current sampling end of the current sensor is electrically connected with a first end of the impedance sampling element, and a second current sampling end of the current sensor is electrically connected with a second end of the impedance sampling element.

Optionally, the controller further comprises at least one first voltage sensor and at least one second voltage sensor;

the voltage acquisition end of the first voltage sensor is electrically connected with the first power supply end, and the voltage acquisition end of the second voltage sensor is electrically connected with the corresponding second power supply end.

In a second aspect, embodiments of the present disclosure also provide a vehicle including the low-voltage power supply network protection circuit according to the first aspect.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the low-voltage power supply network protection circuit comprises a first power supply end, a plurality of second power supply ends and a plurality of power supply control modules, wherein the power supply control modules are arranged in a one-to-one correspondence manner with the second power supply ends, and the power supply control modules are respectively electrically connected with the first power supply ends and the corresponding second power supply ends; the power control module comprises at least one switch control branch which is connected between the first power supply end and the corresponding second power supply end in series. Therefore, according to the embodiment of the disclosure, when any one power supply in the power supply electrically connected with the first power supply end and the power supply electrically connected with the plurality of second power supply ends fails, the corresponding switch control branch is disconnected from the failed power supply and the failed power supply, so that the connection and disconnection of the connecting line between the failed power supply and the failed power supply are controllable, the mutual influence between the failed power supply and the failed power supply is avoided, namely, the mutual influence between multiple power supplies is avoided, the real-time power supply to the vehicle cannot be ensured, the normal running of the vehicle is influenced, and the power supply characteristics of the low-voltage power supply network are optimized.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a low-voltage power supply network protection circuit according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a power control module according to an embodiment of the present disclosure.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

Fig. 1 is a schematic structural diagram of a low-voltage power supply network protection circuit provided in an embodiment of the present disclosure, and fig. 2 is a schematic structural diagram of a power supply control module provided in an embodiment of the present disclosure. With reference to fig. 1 to fig. 2, the low-voltage power supply network protection circuit 100 includes a first power supply terminal a1, a plurality of second power supply terminals a2, and a plurality of power supply control modules 3, where the power supply control modules 3 are disposed in one-to-one correspondence with the second power supply terminals a2, and the power supply control modules 3 are electrically connected to the first power supply terminal a1 and the corresponding second power supply terminals a2, respectively. Fig. 1 exemplarily shows that the low-voltage power supply network protection circuit 100 includes two second power supply terminals a2 and two power supply control modules 3, the second power supply terminal a21 is disposed corresponding to the power supply control module 31, and the second power supply terminal a22 is disposed corresponding to the power supply control module 32.

The power control module 3 comprises at least one switch control branch 5, fig. 2 exemplarily sets that the power control module 3 comprises a plurality of switch control branches 5, the switch control branches 5 are connected in series between the first power terminal a1 and the corresponding second power terminal a2, that is, the switch control branch 5 in the power control module 31 is connected in series between the first power terminal a1 and the second power terminal a21, and the switch control branch 5 in the power control module 32 is connected in series between the first power terminal a1 and the second power terminal a 22.

Optionally, with reference to fig. 1 and fig. 2, the power control module 3 may further include a controller 4, the controller 4 is configured to be electrically connected to the corresponding switch control branch 5, the first sampling terminal C1 of the controller 4 is electrically connected to the first power source terminal a1, and the second sampling terminal C2 of the controller 4 is electrically connected to the corresponding second power source terminal a2, that is, the second sampling terminal C2 of the controller 4 in the power control module 31 is electrically connected to the second power source terminal a21, and the second sampling terminal C2 of the controller 4 in the power control module 32 is electrically connected to the second power source terminal a 22. Illustratively, the Power control module 3 may be, for example, a Power Network Management (PNG) module.

Specifically, the first sampling terminal C1 of the controller 4 is electrically connected to the first power supply terminal A1, the second sampling terminal C2 of the controller 4 is electrically connected to the corresponding second power supply terminal A2, so that the controller 4 can sample the input voltage of the first power supply terminal a1 and the corresponding input voltage of the second power supply terminal a2, and determines the operating state of the power source to which the first power terminal a1 is electrically connected based on the input voltage of the first power terminal a1, and determines the operating state of the power source to which the corresponding second power source terminal a2 is electrically connected based on the input voltage of the second power source terminal a2, that is, controller 4 in power control module 31 can determine the operating state of the power source to which second power source terminal a21 is electrically connected based on the input voltage of second power source terminal a21, and controller 4 in power control module 32 can determine the operating state of the power source to which second power source terminal a22 is electrically connected based on the input voltage of second power source terminal a 22.

Taking the structure shown in fig. 1 as an example, both the controller 4 in the power control module 31 and the controller 4 in the power control module 32 can determine the operating state of the power source electrically connected to the first power source end a1, the controller 4 in the power control module 31 can also determine the operating state of the power source electrically connected to the second power source end a21, and the controller 4 in the power control module 32 can also determine the operating state of the power source electrically connected to the second power source end a 22.

When the first controller determines that the power source electrically connected to the first power source terminal a1 and the power source electrically connected to the second power source terminal a21 work normally and the second controller determines that the power source electrically connected to the first power source terminal a1 and the power source electrically connected to the second power source terminal a22 work normally, the first controller controls at least one switch control branch 5 in the power control module 31 to be turned on, so that the first power source terminal a1 is communicated with the second power source terminal a21, and the power source having the higher output power voltage among the power source electrically connected to the first power source terminal a1 and the power source electrically connected to the second power source terminal a21 can charge the power source having the lower output power voltage. The second controller controls at least one switch in the power control module 32 to control the branch 5 to be turned on, so that the first power supply terminal a1 is connected to the second power supply terminal a22, and the power supply with higher output power supply voltage among the power supplies electrically connected to the first power supply terminal a1 and the power supplies electrically connected to the second power supply terminal a22 can charge the power supply with lower output power supply voltage.

Alternatively, in conjunction with fig. 1 and 2, the first dc conversion power supply 1 may be electrically connected to the first power supply terminal a1 and the power supply 10, respectively, and the second power supply terminal a2 may be electrically connected to the second dc conversion power supply or the battery. For example, the power source electrically connected to the second power source terminal a2 may be the second power source 2, the second power source 21 in fig. 1 may be provided as a storage battery, and the second power source 22 may also be provided as a storage battery, or the second power source 21 in fig. 1 may be provided as a second dc conversion power source, and the second power source 22 may be provided as a storage battery.

Specifically, the first DC conversion power supply and the second DC conversion power supply are both DC conversion power supplies, that is, DC/DC power supplies, the DC conversion power supplies can convert a DC high voltage into a DC low voltage, and also can convert a DC low voltage into a DC high voltage, and the first DC conversion power supply performs voltage conversion on a power supply signal output by the power supply 10.

For example, as shown in fig. 1, the power signal voltage of the power source output by the power supply source 10 after being processed by the first dc conversion power source 1 may be set to be higher than the output voltages of the second power source 21 and the second power source 22, at this time, the power supply source 10 may supply power to the second power source 21 and the second power source 22 through the first dc conversion power source 1, at least one first load 11 may be electrically connected to a connection node N1 of the first dc conversion power source 1 and the power supply source 10, at least one second load 12 may be electrically connected to a connection node N2 of the first dc conversion power source 1 and the first power source terminal a1, and at least one third load 12 may be electrically connected to a connection node N3 of the second power source terminal a2 and the second conversion power source or the storage battery, that is, at least one third load 12 is electrically connected to a connection node N3 of the second power source terminal a2 and the corresponding second power source 2. In this case, the power supply 10 may supply power to the first load 11, may supply power to the second load 12 via the first dc conversion power supply 1, and may supply power to the second power supply 21 and the second power supply 22 via the first dc conversion power supply 1 and the connected switching control branch 5.

It is understood that, when the first controller determines that the power source electrically connected to the first power terminal a1, i.e. the power source electrically connected to the first dc conversion power source 1 and the second power terminal a21, normally operates and the second controller determines that the power source electrically connected to the first power terminal a1 and the power source electrically connected to the second power terminal a22 normally operate, the first controller and the second controller may also control all corresponding switch control branches 5 to be disconnected, so that the first power terminal a1 is disconnected from the second power terminal a21, the first power terminal a1 is disconnected from the second power terminal a22, the power supply 10 supplies power to the first load 11 and supplies power to the second load 12 through the first dc conversion power source 1, the second power source 21 supplies power to the corresponding third load 13, and the second power source 22 supplies power to the corresponding third load 13.

It should be noted that, in the embodiment of the present disclosure, what the first load 11, the second load 12, and the third load 13 are is not limited, and the first load 11, the second load 12, and the third load 13 may be set according to an actual operation demand of the vehicle.

Power failures may include over-voltage problems with the power supply, i.e., the power supply short-circuits the rest of the power supply, or under-voltage problems with the power supply, i.e., the power supply short-circuits to ground. When the first controller and the second controller determine that the power source electrically connected to first power source terminal a1 has an overvoltage or undervoltage problem, the first controller determines that the power source electrically connected to second power source terminal a21 can normally operate and the second controller determines that the power source electrically connected to second power source terminal a22 can normally operate, all switch control branches 5 in first controller-controlled power control module 31 are disconnected to disconnect first power supply terminal a1 from second power supply terminal a21, and all switch control branches 5 in second controller-controlled power control module 32 are disconnected to disconnect first power supply terminal a1 from second power supply terminal a22, thereby avoiding the problem that the power supply not having a fault, which is electrically connected to second power supply terminal a21, and the power supply electrically connected to second power supply terminal a22, are also short-circuited to power supply or to ground due to the power connection electrically connected to first power supply terminal a 1. From this, first controller utilizes corresponding on-off control branch 5 to realize the control to the on-off of interconnecting link between first power end A1 and the second power end A21, the control to the interconnecting link on-off between first power end A1 and the second power end A22 has been realized to the second controller utilization corresponding on-off control branch 5, realized that any power of the same kind has the problem of excessive pressure or undervoltage, all can not influence all the other power normal work, realized the low voltage power network protection of whole car.

When the first controller and the second controller determine that the power source electrically connected to the first power source terminal a1 works normally, the first controller determines that the power source electrically connected to the second power source terminal a21 has an overvoltage or undervoltage problem, and the second controller determines that the power source electrically connected to the second power source terminal a22 works normally, the first controller controls all the switch control branches 5 in the power control module 31 to be disconnected to disconnect the connection between the first power source terminal a1 and the second power source terminal a21 and the connection between the second power source terminal a21 and the second power source terminal a22, so that the problem that the power source electrically connected to the first power source terminal a1 and the power source electrically connected to the second power source terminal a22 which are not in fault are in short circuit to the power source or in ground due to the fact that the power sources electrically connected to the second power source terminal a21 which is in fault are in a same manner is avoided. From this, first controller utilizes corresponding switch control branch 5 to realize the control to the interconnecting link between first power end A1 and second power end A21 to and the interconnecting link break-make between second power end A21 and the second power end A22, has realized that any power of the same kind has the problem of excessive pressure or undervoltage, all can not influence all the other power normal workings, has realized the low voltage power network protection of whole car.

In addition, the second controller can control at least one switch control branch 5 in the power control module 32 to conduct to connect the connection line between the first power terminal a1 and the second power terminal a22, and the power source with higher output power voltage in the power source electrically connected to the first power terminal a1 and the power source electrically connected to the second power terminal a22 can charge the power source with lower output power voltage. For example, the output voltage of the power source electrically connected to first power source terminal a1 may be higher than the output voltage of the power source electrically connected to second power source terminal a22, and at this time, the power source electrically connected to first power source terminal a1 supplies power to the power source electrically connected to second power source terminal a22, and the power source 10 supplies power to the first load 11 and the second load 12 via the first dc-dc converting power source 1, and also supplies power to the third load 13 corresponding to second power source terminal a22 via the connected switch control branch 5. It is understood that, at this time, the second controller may also be configured to control all the switch control branches 5 in the power control module 32 to be disconnected, so that the first power terminal a1 is disconnected from the second power terminal a22, the power supply 10 supplies power to the first load 11 and the second load 12 through the first dc-dc conversion power supply 1, and the second power supply 22 supplies power to the corresponding third load 13.

Similarly, when the first controller and the second controller determine that the power source electrically connected to the first power source terminal a1 is normally operated, the second controller determines that the power source electrically connected to the second power source terminal a22 is in overvoltage or undervoltage condition, and the first controller determines that the power source electrically connected to the second power source terminal a21 is normally operated, the second controller controls all the switch control branches 5 in the power control module 32 to be disconnected to disconnect the connection between the first power source terminal a1 and the second power source terminal a22 and the connection between the second power source terminal a21 and the second power source terminal a22, thereby avoiding the problem that the power source electrically connected to the first power source terminal a1 and the power source electrically connected to the second power source terminal a21 which are not in fault are also in short circuit to the power source or the ground due to the connection of the power source electrically connected to the second power source terminal a22 which is in fault. From this, the second controller utilizes corresponding switch control branch 5 to realize the control to the interconnecting link between first power end A1 and second power end A22 to and the interconnecting link break-make between second power end A21 and the second power end A22, has realized that any power of the same kind has the problem of excessive pressure or undervoltage, all can not influence all the other power normal workings, has realized the low voltage power network protection of whole car.

In addition, the first controller can control at least one switch control branch 5 in the power control module 31 to conduct to connect the connection line between the first power terminal a1 and the second power terminal a21, and the power source with higher output power voltage of the power source electrically connected to the first power terminal a1 and the power source electrically connected to the second power terminal a21 can charge the power source with lower output power voltage. For example, the output voltage of the power source electrically connected to first power source terminal a1 may be higher than the output voltage of the power source electrically connected to second power source terminal a21, and at this time, the power source electrically connected to first power source terminal a1 charges the power source electrically connected to second power source terminal a21, and the power source 10 supplies power to the first load 11 and the second load 12 via the first dc-dc converting power source 1, and also supplies power to the third load 13 corresponding to second power source terminal a21 via the connected switch control branch 5. It is understood that, at this time, the first controller may also be configured to control all the switch control branches 5 in the power control module 31 to be disconnected, so that the first power terminal a1 is disconnected from the second power terminal a21, the power supply 10 supplies power to the first load 11 and the second load 12 through the first dc-dc conversion power supply 1, and the second power supply 21 supplies power to the corresponding third load 13.

In addition, this disclosed embodiment sets up power control module 3 and includes many on-off control branch roads 5, and each other is backup between many on-off control branch roads 5, and when all the other on-off control branch roads 5 became invalid, all the other on-off control branch roads 5 can normally work to the break-make of connecting line between control trouble power and the power that does not break down is favorable to improving low voltage power supply network protection circuit job stabilization nature and security.

It should be noted that, the specific number of the switch control branches 5 in the power control module 3 is not limited in the embodiment of the present disclosure, and the number of the second power source terminals a2 in the low-voltage power source network protection circuit is also not limited in the embodiment of the present disclosure.

Alternatively, in conjunction with fig. 1 and 2, it may be provided that the switch control branch 5 comprises at least one fourth switch K4, and at least one fourth switch K4 is connected in series in turn to form the switch control branch 5. Specifically, the fourth switch K4 in the switch control branch 5 is in series connection, and when any one of the fourth switches K4 in the switch control branch 5 is turned off, the switch control branch 5 can be controlled to be turned off, so as to turn off the connection line between the first power source terminal a1 and the corresponding second power source terminal a2, and when all the fourth switches K4 in the switch control branch 5 are turned on, the switch control branch 5 can be controlled to be turned on, so as to connect the connection line between the first power source terminal a1 and the corresponding second power source terminal a 2.

Alternatively, in conjunction with fig. 1 and fig. 2, it may be configured that the switch control branch 5 includes a plurality of fourth switches K4, at least two fourth switches K4 constitute a back-to-back transistor structure, fig. 2 exemplarily configures that each switch control branch 5 includes four fourth switches K4, two fourth switches K4 on the left side in the switch control branch 5 of fig. 2 constitute a back-to-back transistor structure, and two fourth switches K4 on the right side constitute a back-to-back transistor structure. Illustratively, the fourth switch K4 may be implemented by a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), the back-to-back Transistor structure refers to the anode or cathode of the parasitic diodes of the two fourth switches K4 being in butt joint, the exemplary arrangement of fig. 2 is to butt joint the anodes of the parasitic diodes of the two fourth switches K4 constituting the back-to-back Transistor structure, and the back-to-back Transistor structure constituted by the two fourth switches K4 effectively avoids the reverse leakage generated by the parasitic diodes.

It should be noted that the number of the fourth switches K4 of different switch control branches 5 may be the same or different, and fig. 2 only exemplarily provides that all switch control branches 5 include the fourth switch K4, which is not specifically limited by the embodiment of the present disclosure.

Optionally, with reference to fig. 1 and fig. 2, the switch control branch 5 may further include an impedance sampling element R, the impedance sampling element R is connected in series in the switch control branch 5, the controller 4 includes at least one current sensor 7, a first current sampling terminal E1 of the current sensor 7 is electrically connected to a first terminal of the impedance sampling element R, and a second current sampling terminal E2 of the current sensor 7 is electrically connected to a second terminal of the impedance sampling element R.

Specifically, the impedance sampling device R is connected in series in the switch control branch 5, and the current flowing through the impedance sampling device R is the current flowing through the switch control branch 5, that is, the current flowing through the connection line from the first power source terminal a1 to the corresponding second power source terminal a 2. The first current sampling end E1 of the current sensor 7 is electrically connected to the first end of the impedance sampling element R, the second current sampling end E2 of the current sensor 7 is electrically connected to the second end of the impedance sampling element R, and the current sensor 7 can collect the voltage at the two ends of the impedance sampling element R and then reversely output the current flowing through the corresponding switch control branch 5 according to the resistance value of the impedance sampling element R stored in the current sensor 7.

Illustratively, the controller 4 may further include a main control chip 13, and the main control chip 13 may be implemented by an MCU (micro controller Unit), which may be an MCU main control chip of an ASIL (automatic Safety integrity Level) D. The current sensor 7 can be electrically connected with the main control chip 13, the current sensor 7 sends the collected current flowing through the corresponding switch control branch 5 to the main control chip 13, and the main control chip 13 compares the received collected current with a set current threshold. When the main control chip 13 determines that the current flowing through the impedance sampling element R and collected by the current sensor 7 exceeds the set current threshold, it can be determined that the corresponding switch control branch 5 has the problem of overcurrent operation, and the main control chip 13 controls all the fourth switches K4 in the corresponding switch control branch 5 to be turned off, so as to avoid the overcurrent problem from affecting the normal operation of the power supply electrically connected with the first power supply end a1 and the power supply electrically connected with the corresponding second power supply end a 2.

Exemplarily, the controller 4 may further include a driving chip 14, the driving chip 14 is electrically connected to the main control chip 13 and a control end of the fourth switch K4 in the corresponding switch control branch 5, and the main control chip 13 may control the corresponding fourth switch K4 to turn on or off through the driving chip 14. Illustratively, the driving chip 14 may be implemented by chip model AUIR3242S, and the current sensor 7 may be implemented by chip model INA214QDCKRQ 1.

It should be noted that fig. 2 only exemplarily shows one current sensor 7 and two driving chips 14 corresponding to one switch control branch 5, actually, each switch control branch 5 may be provided with one current sensor 7 and two driving chips 14 corresponding to each other, the current sensor 7 is configured to sample a current through a corresponding impedance sampling element R, and the driving chip 14 is configured to drive a corresponding fourth switch K4 to turn on or off.

Alternatively, in conjunction with fig. 1 and fig. 2, it may be provided that the controller 4 further includes at least one first voltage sensor 8 and at least one second voltage sensor 9, the voltage collecting terminal F1 of the first voltage sensor 8 is electrically connected to the first power supply terminal a1, and the voltage collecting terminal F2 of the second voltage sensor 9 is electrically connected to the corresponding second power supply terminal a2, that is, the voltage collecting terminal F2 of the second voltage sensor 9 in the power supply control module 31 is electrically connected to the second power supply terminal a21, and the voltage collecting terminal F2 of the second voltage sensor 9 in the power supply control module 32 is electrically connected to the second power supply terminal a 22.

Specifically, the voltage collecting terminal F1 of the first voltage sensor 8 is electrically connected to the first power terminal a1, the first voltage sensor 8 can collect the output voltage of the power source electrically connected to the first power terminal a1, the first voltage sensor 8 can be electrically connected to the main control chip 13, the first voltage sensor 8 sends the collected output voltage of the power source electrically connected to the first power terminal a1 to the main control chip 13, and the main control chip 13 compares the received output voltage of the power source electrically connected to the first power terminal a1 with the first set voltage threshold. When the main control chip 13 determines that the output voltage of the power supply connected to the first power supply end a1 is far beyond the first set voltage threshold, it may be determined that the power supply connected to the first power supply end a1 is under-voltage, and when the main control chip 13 determines that the output voltage of the power supply connected to the first power supply end a1 is far less than the first set voltage threshold, it may be determined that the power supply connected to the first power supply end a1 is under-voltage. The main control chip 13 in the power control module 31 controls the fourth switch K4 in the power control module 31 to be completely disconnected, and the main control chip 13 in the power control module 32 controls the fourth switch K4 in the power control module 32 to be completely disconnected, so as to disconnect the connection line from the first power supply terminal a1 to the second power supply terminal a21 and the connection line between the second power supply terminal a22, thereby avoiding the problem of overvoltage or undervoltage of the power electrically connected with the first power supply terminal a1 from affecting the normal operation of the power electrically connected with the second power supply terminal a21 and the power electrically connected with the second power supply terminal a 22.

Specifically, the voltage collecting terminal F2 of the second voltage sensor 9 is electrically connected to the corresponding second power source terminal a2, the second voltage sensor 9 can collect the output voltage of the power source electrically connected to the corresponding second power source terminal a2, the second voltage sensor 9 can be electrically connected to the main control chip 13, the second voltage sensor 9 sends the collected output voltage of the power source electrically connected to the corresponding second power source terminal a2 to the main control chip 13, and the main control chip 13 compares the received output voltage of the power source electrically connected to the second power source terminal a2 with the second set voltage threshold. When the main control chip 13 determines that the output voltage of the power supply electrically connected to the second power supply terminal a2 far exceeds the second set voltage threshold, it may be determined that the power supply electrically connected to the second power supply terminal a2 has the problem of overvoltage operation, and when the main control chip 13 determines that the output voltage of the power supply electrically connected to the second power supply terminal a2 far is smaller than the second set voltage threshold, it may be determined that the power supply electrically connected to the second power supply terminal a2 has the problem of undervoltage operation. The main control chip 13 controls the fourth switch K4 in the corresponding switch control branch 5 to be completely disconnected to disconnect the connection line between the first power end a1 and the corresponding second power end a2, thereby avoiding the problem of overvoltage or undervoltage of the power electrically connected with the second power end a2 from affecting the normal operation of the power electrically connected with the first power end a 1.

Preferably, the controller 4 may be configured to include a plurality of first voltage sensors 8 and a plurality of second voltage sensors 9, the plurality of first voltage sensors 8 are backed up with each other, the plurality of second voltage sensors 9 are backed up with each other, and a failure of a part of the first voltage sensors 8 or a part of the second voltage sensors 9 does not affect the collection of the output voltage of the power source electrically connected to the first power source terminal a1 and the output voltage of the power source electrically connected to the second power source terminal a2, so as to further improve the stability and the safety of voltage collection performed by the low-voltage power source network protection circuit.

Alternatively, in conjunction with fig. 1 and 2, it may be provided that the connection node N1 of the first dc conversion power supply 1 and the power supply 10 is electrically connected with at least one first load 11, a first switch K1 is connected in series between the connection node N1 and the first load 11, at least one second load 12 is electrically connected to the connection node N2 of the first dc conversion power supply 1 and the first power supply end a1, a second switch K2 is connected in series between the connection node N2 and the second load 12, at least one third load 13 is electrically connected to the connection node N3 of the second power supply end a2 and the second conversion power supply or the storage battery, that is, at least one third load 13 is electrically connected to the connection node N3 of the second power supply end a2 and the second power supply 2, and a third switch K3 is connected in series between the connection node N3 and the third load 13. For example, the controller 4 may be electrically connected to a control terminal of the first switch K1, a control terminal of the second switch K2, and a control terminal of the third switch K3, respectively, to control on/off of the first switch K1, the second switch K2, and the third switch K3.

Fig. 1 exemplarily shows two first loads 11, two second loads 12, and four third loads 13, and a first controller and/or a second controller may be provided to control the first switch K1 and the second switch K2 to be turned on or off, the first controller may control the third switch K3 corresponding to the second power source terminal a21 to be turned on or off, and the second controller may control the third switch K3 corresponding to the second power source terminal a22 to be turned on or off.

When the first controller and the second controller determine that the first dc conversion power supply 1 has an overvoltage or undervoltage problem, the first controller and/or the second controller may control all the second switches K2 to be turned off to disconnect the connection line from the first dc conversion power supply 1 to the second load 12, so as to prevent the failed first dc conversion power supply 1 from continuing to supply power to the second load 12 and affecting the performance or the life of the second load 12. Similarly, when the first controller determines that the second power supply 21 has an over-voltage or under-voltage problem, the first controller may control all the third switches K3 corresponding to the second power supply terminal a21 to open the connection line from the second power supply 21 to the third load 13 corresponding to the second power supply terminal a21, so as to prevent the failed second power supply 21 from continuing to supply power to the third load 132, which may affect the performance or life of the third load 13. Similarly, when the second controller determines that the second power supply 22 has an over-voltage or under-voltage problem, the second controller may control all the third switches K3 corresponding to the second power supply terminal a22 to open the connection lines from the second power supply 22 to the third load 13 corresponding to the second power supply 22, so as to prevent the failed second power supply 22 from continuing to supply power to the third load 13, which may affect the performance or the lifetime of the third load 13. In addition, when the first controller and the second controller determine that the power supply 10 has an over-voltage or under-voltage problem, the first controller and/or the second controller may control all the first switches K1 and all the second switches K2 to be turned off, so as to prevent the failed power supply 10 from continuing to supply power to the first load 11 and the second load 12.

For example, it may be provided that the first load 11 includes at least one of a kick sensor or a door handle, the second load 12 includes at least one of a kick sensor or a door handle, and the third load 13 includes at least one of a motor controller, a generator controller, an engine controller, an electric power steering system, an active seat belt module, a vehicle body electronic stability system, an electromechanical servo power mechanism system, an air suspension, a combination switch assembly, a head lamp module, a tire pressure monitoring module, a motor water pump, a battery water pump, a fan, an electronic expansion valve, a blower, or an electric charging door.

In particular, due to the consideration of different loads to adapt to the operating voltage, the corresponding load is arranged to be connected to the corresponding power supply output terminal, and the third load 13 may also be set corresponding to the operational safety level of the power control module 3, for example if the operational safety level of the power control module 3 is high, the third load 13 corresponding to the power control module 3 may include at least one of a motor controller, a generator controller, an engine controller, an electric power steering system, an active safety belt module, a vehicle body electronic stabilizing system, an electromechanical servo main power mechanism system, an air suspension, a combination switch assembly, a front light tube module or a tire pressure monitoring module, if the working safety level of the power control module 3 is low, the third load 13 corresponding to the power control module 3 may include at least one of a motor water pump, a battery water pump, a fan, an electronic expansion valve, a blower, or an electric charging port cover.

It should be noted that, in the embodiment of the present disclosure, the number of the first load 11, the second load 12, and the third load 13 is not specifically limited, and what the first load 11, the second load 12, and the third load 13 are specifically also not specifically limited, and the specific first load 11, the second load 12, and the third load 13 may be set according to the selection condition of the specific power source.

For example, as shown in fig. 1, the second switch K2 and the third switch K3 may be provided separately from the power control module 3, and the second switch K2 and/or the third switch K3 may be provided integrally with the corresponding power control module 3, for example, the second switch K2 may be provided integrally with the power control module 31 or the power control module 32, the third switch K3 provided corresponding to the second power source terminal a21 may be provided integrally with the power control module 31, and the third switch K3 provided corresponding to the second power source terminal a22 may be provided integrally with the power control module 32.

Optionally, with reference to fig. 1 and fig. 2, the power control module 3 may further include a System Base Chip (SBC), and the trigger signal output terminal G1 of the System base chip 10 is electrically connected to the trigger signal input terminal G2 of the controller 4. Specifically, the trigger signal output terminal G1 of the system base chip 10 is electrically connected to the trigger signal input terminal G2 of the controller 4, and the system base chip 10 sends a trigger signal to the controller 4 to trigger the controller 4, or trigger the main control chip 13 in the controller 4, to start operating.

Optionally, with reference to fig. 1 and fig. 2, the power control module 3 may further include a first one-way conduction device D1 and a second one-way conduction device D2, a positive terminal of the first one-way conduction device D1 is electrically connected to the corresponding second power terminal a2, a negative terminal of the first one-way conduction device D1 and a negative terminal of the second one-way conduction device D2 are electrically connected to the power supply terminal G3 of the system base chip 10, and a positive terminal of the second one-way conduction device D2 is electrically connected to the first power terminal a 1.

Specifically, the first unidirectional conducting device D1 and the second unidirectional conducting device D2 may be implemented by diodes, where an anode of the diode is used as a positive terminal of the unidirectional conducting device, and a cathode of the diode is used as a negative terminal of the unidirectional conducting device. The power supply electrically connected with the first power end a1 can supply power to the system base chip 10 through the first power end a1 and the second one-way conduction device D2 to ensure the normal operation of the system base chip 10, the power supply electrically connected with the second power end a2 can supply power to the corresponding system base chip 10 through the second power end a2 and the corresponding first one-way conduction device D1, the power supply line where the first one-way conduction device D1 is located and the power supply line where the second one-way conduction device D2 is located are backup to each other, any one power supply line has a problem, the power supply of the system base chip 10 can be ensured by using another power supply line, and the stability and the safety of supplying power to the system base chip 10 are improved. In addition, the first unidirectional conducting device D1 and the second unidirectional conducting device D2 can also effectively prevent the power supply current of the system base chip 10 from flowing back to the first power supply terminal a1 or the second power supply terminal a2, and as shown in fig. 2, a fuse blowing device such as a fuse S can be disposed on the power supply line of the system base chip 10.

Optionally, in conjunction with fig. 1 and 2, at least one of the controller 4, the system base chip 10, or the switch control branch 5 may be correspondingly provided with a temperature detection module (not shown in fig. 1 and 2), and a temperature detection output end of the temperature detection module is electrically connected with a temperature detection input end of the controller 4. Specifically, the temperature detection module may be utilized to detect the operating temperatures of the controller 4, the system base chip 10 and the switch control branch 5 in real time and send the temperature detection result to the controller 4 through the temperature detection output end and the temperature detection input end, and when the temperature is detected to be abnormal, the corresponding temperature detection module may control the switch control branch 5 to turn off or perform the use warning prompt through the controller 4, for example, the MCU in the controller 4. Illustratively, the Temperature detection module may be implemented by an NTC (Negative Temperature Coefficient) thermosensitive device. In addition, when the power control module 3 includes a plurality of switch control branches 5, taking the case that the power control module 3 includes six switch control branches 5 as an example, one temperature detection module may be correspondingly provided for each two adjacent switch control branches 5.

Through the technical scheme of the embodiment of the disclosure, the robustness of the low-voltage power supply network protection circuit is improved, the failure rate and the failure rate of the low-voltage power supply network protection circuit are reduced, the low-voltage power supply network protection circuit can be flexibly arranged at a position close to a power supply end in a whole vehicle power grid, the high functional safety level is achieved, safety redundancy is achieved through multiple control loops, reliable power supply is provided for related loads, functional safety ASIL D can be achieved, the low-voltage power supply network protection circuit is suitable for various electronic and electrical architectures, and the matching performance is high.

The embodiment of the present disclosure further provides a vehicle, where the vehicle includes the low-voltage power supply network protection circuit according to the above embodiment, and therefore the vehicle provided by the embodiment of the present disclosure has the beneficial effects described in the above embodiment. In addition, the vehicle according to the embodiment of the present disclosure may be a fuel-powered vehicle, a pure electric vehicle, a hybrid electric vehicle, or the like, and the embodiment of the present disclosure is not particularly limited thereto.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low voltage power supply network protection circuit, comprising:

2. The low-voltage power supply network protection circuit according to claim 1, wherein the first dc conversion power supply is electrically connected to the first power supply terminal and the power supply source, respectively, and the second power supply terminal is electrically connected to the second dc conversion power supply or the storage battery.

3. The low-voltage power supply network protection circuit according to claim 2, wherein a connection node of the first dc conversion power supply and the power supply is electrically connected with at least one first load, and a first switch is connected in series between the connection node and the first load;

4. The low-voltage power supply network protection circuit of claim 3, wherein the first load comprises at least one of a kick sensor or a vehicle door handle;

the second load comprises at least one of a kick sensor or a door handle;

5. The low-voltage power supply network protection circuit according to claim 1, wherein the switch control branch comprises at least one fourth switch, and the at least one fourth switch is sequentially connected in series to form the switch control branch.

6. The low-voltage power supply network protection circuit according to claim 5, wherein the switch control branch comprises a plurality of the fourth switches, and at least two of the fourth switches form a back-to-back transistor structure.

7. The low-voltage power supply network protection circuit according to claim 1, wherein the power supply control module further comprises a controller electrically connected to the corresponding switch control branch;

8. The low-voltage power supply network protection circuit according to claim 7, wherein the switch control branch further comprises an impedance sampling element, and the impedance sampling element is connected in series in the switch control branch;

9. The low voltage power supply network protection circuit of claim 7, wherein the controller further comprises at least one first voltage sensor and at least one second voltage sensor;

10. A vehicle comprising a low voltage power supply network protection circuit as claimed in any one of claims 1 to 9.