Overcurrent protection circuit, vehicle and vehicle drive-by-wire chassis

Abstract

The utility model discloses an over-current protection circuit, a vehicle and a vehicle drive-by-wire chassis, and relates to the field of power control, the over-current protection circuit comprises a plurality of current sampling modules and an over-current protection module, the over-current protection module comprises an adder, a comparator and a state latch circuit; each current sampling module in the plurality of current sampling modules is used for collecting the current value of the connected power supply branch; the input end of the summator is connected with the plurality of current sampling modules and is used for calculating the current accumulated value of all the power supply branches; the input end of the comparator is connected with the output end of the summator, and the comparator is used for comparing whether the current accumulated value exceeds a preset overcurrent threshold value or not; the state latch circuit is connected with the output end of the comparator, and is used for controlling the disconnection of the electrical connection of all the power supply branches when the current accumulated value is greater than a preset overcurrent threshold value, and latching the disconnection state of the electrical connection of all the power supply branches. According to the technical scheme, the stability of power circuit connection can be guaranteed, and loss of circuit hardware is avoided.

Description

Technical Field

[0001] The present application relates to the field of power supply control, and in particular to an overcurrent protection circuit, a vehicle wire-controlled chassis and a vehicle. Background Art

[0002] In the process of power supply circuit design, in order to meet the requirements of power supply products and consider their own protection measures, it is necessary to add overcurrent protection circuit to ensure power supply safety. Overcurrent means that the current on the load exceeds the power supply limit, causing damage to the power supply. In order to prevent more serious consequences, it is necessary to disconnect the load from the power supply when overcurrent occurs, limit the output current of the power supply, and protect the load and power supply.

[0003] The traditional power network protection module (PNG) circuit design samples the current of each parallel branch through the microcontroller (MCU), and the software accumulates the current. When the overall current exceeds the overcurrent threshold, the MCU controls the metal-oxide-semiconductor field-effect transistor (MOSFET) drive circuit to disconnect. However, this method can only control the disconnection of the power circuit. During the overcurrent protection control process, the circuit can often reset and connect itself after the current returns to normal, and the circuit frequently switches between on and off, which makes it impossible to ensure the stability of the circuit connection, and easily causes damage to the circuit hardware. Summary of the invention

[0004] In view of this, the present application provides an overcurrent protection circuit, a vehicle and a vehicle wire-controlled chassis, which can ensure the stability of the power circuit connection and avoid damage to the circuit hardware.

[0005] To achieve the above-mentioned object, an embodiment of the first aspect of the present application provides an overcurrent protection circuit, comprising: a plurality of current sampling modules, an overcurrent protection module, wherein the overcurrent protection module comprises an adder, a comparator and a state latch circuit;

[0006] Each current sampling module in the multiple current sampling modules is used to collect the current value of the connected power supply branch;

[0007] The input end of the adder is connected to the multiple current sampling modules, and is used to calculate the current accumulation value of all power supply branches;

[0008] The input end of the comparator is connected to the output end of the adder, and is used to compare whether the current accumulated value exceeds a preset overcurrent threshold;

[0009] The state latch circuit is connected to the output end of the comparator, and is used to control the disconnection of the electrical connections of all the power branches and latch the disconnection state of the electrical connections of all the power branches when the current accumulated value is greater than the preset overcurrent threshold.

[0010] Optionally, the current sampling module includes a current sampling resistor and an operational amplifier;

[0011] The two ends of the current sampling resistor are connected to the power supply branch, the positive input end and the negative input end of the operational amplifier are connected to the two ends of the current sampling resistor, the operational amplifier is used to collect the current value at the two ends of the current sampling resistor, and amplify the current value, the output end of the operational amplifier is connected to the input end of the adder as the output end of the current sampling module, and is used to input the amplified current value into the adder;

[0012] The adder is used to accumulate and calculate the current values ​​of all power supply branches after the amplification process to obtain the accumulated current value of all power supply branches.

[0013] Optionally, the overcurrent protection module further includes a load driving module;

[0014] The output end of the load driving module is connected to each of the power supply branches, and the load driving module is used to provide driving enable for each of the power supply branches.

[0015] Optionally, the input end of the load driving module is connected to the output end of the state latch circuit;

[0016] The state latch circuit is used to send a drive signal to the load driving module when the current accumulated value is greater than the preset overcurrent threshold, and the drive signal is used to instruct to turn off the drive enable;

[0017] The load driving module is used to shut down the driving enable provided to each of the power supply branches after receiving the driving signal.

[0018] Optionally, the overcurrent protection module also includes a switch module, and the output end of the load driving module is connected to each of the power supply branches through the switch module, and the switch module is used to disconnect the electrical connection of each of the power supply branches when the load driving module turns off the drive enable.

[0019] Optionally, the state latch circuit is further used to latch the drive signal when the load drive module turns off the drive enable, so as to latch the electrical disconnection state of all the power supply branches.

[0020] Optionally, the driving signal is a level signal for turning off the driving enable.

[0021] Optionally, the overcurrent protection module includes a main overcurrent protection module and at least one backup overcurrent protection module, and the main overcurrent protection module and the at least one backup overcurrent protection module respectively include the adder, the comparator and the state latch circuit;

[0022] The main overcurrent protection module and the at least one backup overcurrent protection module are respectively connected to the multiple current sampling modules, and the at least one backup overcurrent protection module is used to perform overcurrent protection on the power supply when the main overcurrent protection module fails.

[0023] In a second aspect of the present application, an embodiment provides a vehicle-by-wire chassis, comprising: an overcurrent protection circuit as described in the first aspect.

[0024] In a third aspect embodiment of the present application, a vehicle is provided, comprising: the overcurrent protection circuit as described in the first aspect and the vehicle wire-controlled chassis as described in the second aspect.

[0025] The present invention provides an overcurrent protection circuit, a vehicle wire-controlled chassis and a vehicle, which provide an overcurrent protection circuit, and include multiple current sampling modules and an overcurrent protection module in the overcurrent protection circuit, wherein the overcurrent protection module includes an adder, a comparator and a state latch circuit; the current sampling module can be used to collect the current value of the connected power branch, and the adder can be used to calculate the current cumulative value of all power branches; and the comparator can be used to compare the current cumulative value with the preset overcurrent threshold, and when the current cumulative value is greater than the preset overcurrent threshold, the state latch circuit is used to control the disconnection of the electrical connection of all power branches, and latch the disconnection state of the electrical connection of all power branches. The technical solution of the present invention can be achieved by adding hardware equipment for overcurrent protection, and in the control process of power overcurrent protection, the adder, the comparator and the state latch circuit are used to perform hardware overcurrent protection control. When controlling the electrical disconnection of all power branches, the shutdown state is latched by the state latch circuit, which can prevent the circuit from resetting and connecting itself after the current returns to normal during the overcurrent protection control process, and avoid frequent circuit connection and disconnection jumps. This can ensure the stability of the power circuit connection and avoid damage to the circuit hardware.

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0028] Figure 1 A schematic diagram of the circuit structure of an overcurrent protection circuit provided by an embodiment of the present invention is shown;

[0029] Figure 2 A schematic diagram of the circuit structure of a state latch circuit provided by an embodiment of the present invention is shown;

[0030] Figure 3 A schematic diagram of a flow chart of an overcurrent protection method provided by an embodiment of the present invention is shown;

[0031] In the figure:

[0032] 1-current sampling module, 11-current sampling resistor, 12-operational amplifier;

[0033] 2-overcurrent protection module, 21-adder, 22-comparator, 23-state latch circuit, 231-controllable power supply, 232-JK trigger, 24-load drive module, 25-switch module. DETAILED DESCRIPTION

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0038] Combine the following Figure 1 An overcurrent protection circuit according to some embodiments of the present invention is described.

[0039] An overcurrent protection circuit provided by an embodiment of the present invention is as follows: Figure 1 As shown, the overcurrent protection circuit includes: multiple current sampling modules 1, at least two overcurrent protection modules 2, and the overcurrent protection module 2 includes an adder 21, a comparator 22 and a state latch circuit 23; each current sampling module 1 in the multiple current sampling modules 1 is used to collect the current value of the connected power branch; the input end of the adder 21 is connected to the multiple current sampling modules 1, and is used to calculate the current accumulation value of all power branches; the input end of the comparator 22 is connected to the output end of the adder 21, and is used to compare whether the current accumulation value exceeds the preset overcurrent threshold; the state latch circuit 23 is connected to the output end of the comparator 22, and is used to control the disconnection of the electrical connection of all power branches when the current accumulation value is greater than the preset overcurrent threshold, and latch the disconnection state of the electrical connection of all power branches. By designing a hardware overcurrent shutdown circuit, a fast response to an overcurrent fault can be achieved, and the strict fault response time requirements of the redundant power supply of the wire-controlled chassis can be met. When controlling the electrical disconnection of all power branches, the shutdown state is latched by the state latch circuit, which can prevent the circuit from resetting and connecting itself after the current returns to normal during the overcurrent protection control process, and avoid frequent circuit connection and disconnection jumps. This can ensure the stability of the power circuit connection and avoid damage to the circuit hardware.

[0040] In addition, in a specific application scenario, the overcurrent protection module 2 may include at least two overcurrent protection modules, which can be divided into a main overcurrent protection module and at least one spare overcurrent protection module, and the main overcurrent protection module and the at least one spare overcurrent protection module respectively include an adder 21, a comparator 22 and a state latch circuit 23. The main overcurrent protection module and the at least one spare overcurrent protection module are respectively connected to multiple current sampling modules 1, and at least one spare overcurrent protection module is used to perform overcurrent protection on the power supply when the main overcurrent protection module fails. Among them, a main overcurrent protection module and at least one spare overcurrent protection module constitute a redundant circuit for redundant overcurrent protection of the power supply. That is, at least two overcurrent protection modules act on the overcurrent protection circuit at the same time. Even if any one of the at least two overcurrent protection modules fails, when the power supply overcurrent occurs, the other remaining connected overcurrent protection modules can also realize redundant diagnosis and protection of the power supply overcurrent fault, thereby meeting the high safety level requirements of the power supply.

[0041] In a specific application scenario, a power supply to be overcurrent protected may include multiple parallel power branches, which are used to connect power loads. When the current on all power loads exceeds the power supply limit, the power supply will be damaged. In view of this, each of the multiple power branches can be connected to a current sampling module 1, and the current sampling module 1 can be used to collect the branch current value under the connected power branch. The adder 21 is connected to multiple current sampling modules 1 corresponding to all power branches, and is used to obtain the branch current values ​​of all power branches collected by multiple current sampling modules 1, and the current values ​​of all power branches are accumulated and calculated to obtain the current accumulated values ​​of all power branches. By using the adder to accumulate the current of each parallel power branch, the effect of mutual compensation of the current errors of each channel can be achieved, and the accuracy of the hardware overcurrent threshold setting can be improved. The comparator 22 can compare the current accumulated value with the preset overcurrent threshold, and when the current accumulated value is greater than the preset overcurrent threshold, the state latch circuit 23 can control the electrical connection of all power branches to be disconnected. Among them, the preset overcurrent threshold is used to represent the maximum current value supplied by the vehicle power supply, such as 50A. The specific value can be set according to the actual application scenario and is not specifically limited here.

[0042] Correspondingly, such as Figure 1 As shown, the current sampling module 1 may include a current sampling resistor 11 and an operational amplifier 12; the two ends of the current sampling resistor 11 are connected to the power branch, the positive input end and the negative input end of the operational amplifier 12 are connected to the two ends of the current sampling resistor 11, the operational amplifier 12 is used to collect the current value at the two ends of the current sampling resistor 11, and amplify the current value, and the output end of the operational amplifier 12 is connected to the adder 21 as the output end of the current sampling module 1. Among them, when the operational amplifier 12 collects the current value at the two ends of the current sampling resistor 11, it can collect the voltage value at the two ends of the current sampling resistor 11, and determine the ratio of the voltage value to the resistance value of the current sampling resistor 11 as the current value at the two ends of the current sampling resistor 11. In view of the fact that the collected current value is often a small current value, in order to facilitate the comparison and judgment of the current, the operational amplifier can also be used to amplify the current accumulated value based on the preset amplification factor, and then the amplified current value is input into the adder 21, and the adder 21 accumulates and calculates the current values ​​of all power branches after amplification to obtain the current accumulated value of all power branches. The comparator 22 compares the current accumulated value after amplification with the preset over-current threshold after amplification by the same amplification factor to determine whether over-current protection needs to be performed on the power supply.

[0043] In specific application scenarios, such as Figure 1As shown, the overcurrent protection module 2 also includes a load driving module 24, the output end of the load driving module 24 is connected to each power branch, and the driving circuit 24 is used to provide driving enable for each power branch. When the load driving module 24 provides the driving enable normally, each power branch is normally turned on. When the load driving module 24 does not continue to provide the driving enable, each power branch will be disconnected, thereby achieving the purpose of overcurrent protection. Among them, the input end of the load driving module 24 is connected to the output end of the state latch circuit 23; the state latch circuit 23 is used to send a driving signal to the load driving module 24 when the current accumulated value is greater than the preset overcurrent threshold, and the driving signal is used to indicate to turn off the driving enable; the load driving module 24 is used to turn off the driving enable provided for each power branch after receiving the driving signal. Among them, the driving signal is specifically a level signal for turning off the load driving module 24, such as a high level signal or a low level signal, which may depend on the working mode of the load driving module 24, and is not specifically limited here.

[0044] In specific application scenarios, such as Figure 2 As shown, the state latch circuit 23 may include a non-locking switch SW, a controllable power supply 231 and a JK trigger 232, wherein: the JK trigger 232 maintains the state at the rising edge of the clock pulse and flips the state at the falling edge of the clock pulse; one end of the non-locking switch SW is connected to the output end of the comparator 22, and the other end is connected to the high level and the clock pulse input end of the JK trigger 232; the control end of the controllable power supply 231 is connected to the state output end of the JK trigger 232.

[0045] Among them, the non-locking switch SW is used to connect between its first end and the second end when the current accumulated value is greater than the preset overcurrent threshold, and the output state of the non-locking switch SW is fixed to a low level; when the current accumulated value is less than or equal to the preset overcurrent threshold, the non-locking switch SW pops up, and the connection between its first end and the second end is disconnected, and the output state of the non-locking switch SW is clamped at a high level. The JK trigger 232 uses the output of the non-locking switch SW as the clock pulse input, and adopts a connection method in which both the J end and the K end of the JK trigger 232 are connected to a high level. At this time, the state of the JK trigger 232 is updated only when the input clock pulse is a falling edge, and the state of the JK trigger 232 remains unchanged when the input clock pulse is a rising edge, the input clock pulse is a high level, and the input clock pulse is a low level. The output end of the controllable power supply 231 is connected to the input end of the load driving module 24, and whether the controllable power supply 231 supplies power to the load depends on the state of the JK trigger 232. The JK trigger 232 has two stable states, one is a high level state and the other is a low level state, that is: when the state of the JK trigger 232 is a high level, the controllable power supply 231 supplies power to the load, and when the state of the JK trigger 232 is a low level, the controllable power supply 231 stops supplying power to the load, so that the load driving module 24 turns off the driving enable; or, when the state of the JK trigger 232 is a low level, the controllable power supply 231 supplies power to the load, and when the state of the JK trigger 232 is a high level, the controllable power supply 231 stops supplying power to the load, so that the load driving module 24 turns off the driving enable.

[0046] The controllable power supply 231 may adopt a triode switch circuit. Figure 2 Only one topological structure of a controllable power supply 231 is shown, which supplies power to the load when the JK trigger 232 outputs a high level, and stops supplying power to the load when the JK trigger 232 outputs a low level. It includes a DC power supply, a PNP transistor Q1 and an NPN transistor Q2, wherein: the emitter of the PNP transistor Q1 is connected to the DC power supply, its collector is connected to the load, and its base is connected to the collector of the NPN transistor Q2; the base of the NPN transistor Q2 is connected to the output end of the JK trigger 232, and the emitter of the NPN transistor Q2 is grounded. When the JK trigger 232 outputs a high level, the NPN transistor Q2 is turned on, and the PNP transistor Q1 is turned on as the NPN transistor Q2 is turned on, and the DC power supply starts to supply power to the load, even if the load driving module 24 provides drive enable for each power supply branch; when the JK trigger 232 outputs a low level, the NPN transistor Q2 is turned off, and the PNP transistor Q1 is turned off as the NPN transistor Q2 is turned off, and the DC power supply stops supplying power to the load, even if the load driving module 24 turns off the drive enable.

[0047] Correspondingly, the state latch circuit 23 is also used to latch the drive signal after turning off the drive enable of the load drive module, so as to lock the off state of the drive enable, that is, to latch the electrical connection disconnection state of all power branches. By latching the off state, it is possible to avoid the circuit resetting and connecting itself after the current is normal during the overcurrent protection control process, and avoid frequent circuit connection and disconnection jumps, thereby protecting the circuit. After latching the off state, it can be manually reset by humans, or reset in response to a control signal, so as to ensure the stability of the circuit connection and avoid the loss of circuit hardware.

[0048] In specific application scenarios, such as Figure 1 As shown, the overcurrent protection module 2 also includes a switch module 25, and the output end of the load driving module 24 is connected to each power branch through the switch module 25. The switch module 25 is used to disconnect the connected power branch when the load driving module 24 turns off the drive enable. Among them, the switch module 25 is used to control the on and off of the connected power branch, that is, when the accumulated current value of each power branch does not exceed the preset overcurrent threshold, the output end of the load driving module 24 has an enable signal output, and the switch module 25 is equivalent to a switch in a closed state under the enable signal, and the power branch can remain in the power connection state; when the accumulated current value of each power branch exceeds the preset overcurrent threshold, the output end of the load driving module 24 has no enable signal output, and the switch module 25 is equivalent to a switch in an open state, and the power branch will be disconnected at this time.

[0049] The switch module 25 may be a transistor switch circuit, a field effect transistor switch circuit, a MOS switch circuit, etc. In the embodiment steps of the present disclosure, the switch module 25 is taken as a field effect transistor switch circuit as an example to illustrate the technical solution of the present disclosure, but it does not constitute a specific limitation. Figure 1As shown, the field effect transistor switch circuit may include two N-type field effect transistors (such as QA1, QA2) and diodes connected in parallel with each N-type field effect transistor, wherein the gates of the two N-type field effect transistors are connected to the output end of the load driving module 24 as the input end of the switch circuit, the drains of the two N-type field effect transistors are connected, the sources of the two N-type field effect transistors are connected to VBAT1 and VBAT2 of the corresponding power supply branches, the input end of the power diode is connected to the source of the corresponding N-type field effect transistor, and the output end of the power diode is connected to the drain of the corresponding N-type field effect transistor. When the output end of the load driving module 24 does not output an enable signal, the gate-source voltage of the two N-type field effect transistors is 0, and the two N-type field effect transistors will be disconnected, that is, at this time, the switch module 25 is equivalent to a switch in an off state, and the power supply branch will be disconnected. On the contrary, when there is no enable signal output at the output end of the load driving module 24, the gate-source voltage of the two N-type field effect transistors is not 0, and the two N-type field effect transistors will be turned on, that is, at this time the switch module 25 is equivalent to a switch in a closed state, the power supply branch will be turned on, and the power supply will normally supply power to the load.

[0050] In specific application scenarios, such as Figure 1 As shown, for the same power branch, at least two load driving modules 24 and at least two switch modules 25 connected to the at least two load driving modules 24 can be set, and at least two switch modules 25 are used to simultaneously control the on and off of the connected power branch, which can also constitute a redundant circuit for redundant overcurrent protection of the power supply. That is, at least two load driving modules 24 and at least two switch modules 25 act on the overcurrent protection circuit at the same time. Even if any one of the switch modules 25 fails, when the power supply overcurrent occurs, the other remaining connected switch modules 25 can also cut off the power branch in time to achieve protection against overcurrent faults, thereby meeting the high safety level (such as ASIL D) requirements of the power supply.

[0051] Through the overcurrent protection circuit provided by this embodiment, the current sampling module can be used to collect the current value of the connected power branch, and the adder can be used to calculate the current cumulative value of all power supplies including branches; and the comparator can be used to compare the current cumulative value and the preset overcurrent threshold, and when the current cumulative value is greater than the preset overcurrent threshold, the state latch circuit is used to control the disconnection of the electrical connection of all power branches, and latch the disconnection state of the electrical connection of all power branches. The technical solution of the present invention can be achieved by adding hardware equipment for overcurrent protection, and in the control process of power overcurrent protection, the adder, comparator and state latch circuit are used to perform hardware overcurrent protection control. When controlling the disconnection of the electrical connection of all power branches, the shutdown state is latched by the state latch circuit, which can avoid the circuit from resetting and connecting itself after the current is normal during the overcurrent protection control process, and the frequent jump phenomenon of circuit connection and disconnection can be avoided, which can ensure the stability of the power circuit connection and avoid the loss of circuit hardware.

[0052] The present invention provides a dual power switching method, see Figure 3 , which may include the following steps:

[0053] Step 101: Receive current values ​​of each power branch collected by a current sampling module.

[0054] In a specific application scenario, a power supply to be protected from overcurrent may include multiple parallel power branches, which are used to connect power loads. When the current on all power loads exceeds the power supply limit, the power supply will be damaged. In view of this, each of the multiple power branches can be connected to a current sampling module, and the current sampling module can be used to collect the branch current value of the connected power branch. For the embodiment of the present disclosure, the overcurrent protection module can receive the current value of each power branch collected by the current sampling module.

[0055] The executor of the embodiment of the present disclosure may be an overcurrent protection module in the overcurrent protection circuit. The overcurrent protection module includes an adder, a comparator, a state latch circuit, a load driving module and a switch module. When executing overcurrent protection, the overcurrent protection module may receive the current values ​​of each power branch collected by the current sampling module, and accumulate and calculate the current values ​​of each power branch to obtain the current accumulated value of all power branches; then compare the current accumulated value with the preset overcurrent threshold, and when the current accumulated value is greater than the preset overcurrent threshold, use the state latch unit to control the disconnection of the electrical connections of all power branches and latch the disconnection state of the electrical connections of all power branches.

[0056] Step 102: Utilize an adder to cumulatively calculate the current value of each power supply branch to obtain the current cumulative value of all power supply branches.

[0057] For the embodiment of the present disclosure, after receiving the current values ​​of all power branches, the overcurrent protection module can call the adder, use the adder to accumulate and calculate the current values ​​of all power branches, and further obtain the current accumulated value of all power branches corresponding to the power supply.

[0058] Step 103: using a comparator to compare the current accumulation value with a preset overcurrent threshold, and when the current accumulation value is greater than the preset overcurrent threshold, using a state latch circuit to control the electrical disconnection of all power branches and latch the electrical disconnection state of all power branches.

[0059] Among them, the preset overcurrent threshold is used to characterize the maximum current value supplied by the power supply, such as 50A. The specific value can be set according to the actual application scenario and is not specifically limited here.

[0060] For the embodiments of the present disclosure, after the adder calculates the current accumulated value of all power branches, the overcurrent protection module can call the comparator to compare the current accumulated value with the preset overcurrent threshold, and when the current accumulated value is greater than the preset overcurrent threshold, use the state latch circuit to control the disconnection of the electrical connections of all power branches.

[0061] In specific application scenarios, given that the collected current values ​​are often small current values, in order to facilitate the comparison and judgment of the current, the current sampling module can also use an operational amplifier to amplify the collected current values ​​of each power branch, and then input the amplified current value into the adder, which accumulates and calculates the current values ​​of all power branches after amplification to obtain the current cumulative value of all power branches. The comparator compares the amplified current cumulative value with the preset overcurrent threshold after amplification by the same amplification factor to determine whether overcurrent protection needs to be performed on the power supply. When the amplified current cumulative value is greater than the corresponding preset overcurrent threshold, it indicates that an overcurrent fault has occurred in the power supply, so the electrical connection of all power branches can be disconnected.

[0062] Accordingly, when the state latch circuit controls the disconnection of the electrical connection of all power branches, it can send a drive signal to the load driver module, and the drive signal is used to instruct the load driver module to turn off the drive enable. When the load driver module turns off the drive enable, the switch module connected to the load driver module will disconnect the power branch connection. The drive signal is specifically a level signal for turning off the load driver module, such as a high level signal or a low level signal, which may depend on the working mode of the load driver module and is not specifically limited here.

[0063] In a specific application scenario, as a possible implementation method, when the drive enable of the load drive module is turned off, a state latch circuit can also be used to lock the off state of the drive enable. By latching the off state, it can be avoided that the circuit will reset and connect itself after the current returns to normal during the overcurrent protection control process, and the circuit will not frequently switch on and off, thereby protecting the circuit. After latching the off state, it can be manually reset or reset in response to a control signal, so as to ensure the stability of the circuit connection and avoid damage to the circuit hardware.

[0064] The overcurrent protection method of the present invention can use the current sampling module to collect the current value of the connected power branch, use the adder to calculate the current cumulative value of all power branches; and use the comparator to compare the current cumulative value and the preset overcurrent threshold, and when the current cumulative value is greater than the preset overcurrent threshold, use the state latch circuit to control the disconnection of the electrical connection of all power branches, and latch the disconnection state of the electrical connection of all power branches. The technical scheme of the present invention can increase the hardware equipment of overcurrent protection, and use the adder, comparator and state latch circuit to perform hardware overcurrent protection control in the control process of power overcurrent protection, without the need for software to participate in execution, which can reduce the control reaction delay of the software, achieve a fast response to overcurrent faults, meet the strict fault response time requirements of the redundant power supply of the vehicle control-by-wire chassis, and improve the stability of the power circuit. When controlling the disconnection of the electrical connection of all power branches, the shutdown state is latched by the state latch circuit, which can avoid the circuit from resetting and connecting itself after the current is normal during the overcurrent protection control process, and the frequent jump phenomenon of circuit connection and disconnection can be avoided, which can ensure the stability of the power circuit connection and avoid the loss of circuit hardware.

[0065] Based on the above Figure 3 The method shown in the embodiment also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned Figure 3 The method shown.

[0066] Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, USB flash drive, mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods of various implementation scenarios of the present application.

[0067] Based on the above Figure 3 In order to achieve the above-mentioned purpose, the embodiment of the present application also provides an electronic device, which can be configured on the vehicle (such as an electric vehicle) side, and the device includes a storage medium and a processor; the storage medium is used to store a computer program; the processor is used to execute the computer program to achieve the above-mentioned Figure 3 The method shown.

[0068] Optionally, the above-mentioned physical device may also include a user interface, a network interface, a camera, a radio frequency (RF) circuit, a sensor, an audio circuit, a WI-FI module, etc. The user interface may include a display, an input unit such as a keyboard, etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (such as a WI-FI interface), etc.

[0069] Those skilled in the art will appreciate that the above-mentioned physical device structure provided in this embodiment does not constitute a limitation on the physical device, and may include more or fewer components, or a combination of certain components, or different arrangements of components.

[0070] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the above-mentioned physical device, and supports the operation of the information processing program and other software and / or programs. The network communication module is used to realize the communication between the components inside the storage medium, and the communication with other hardware and software in the information processing physical device.

[0071] Based on the above-mentioned overcurrent protection circuit, an embodiment of the present application further provides a vehicle-by-wire chassis, which may include the above-mentioned overcurrent protection circuit, or may specifically include: the above-mentioned electronic device.

[0072] Based on the above overcurrent protection circuit, the embodiment of the present application further provides a vehicle, which may include the above overcurrent protection circuit or the above vehicle wire-controlled chassis, or may specifically include: the above electronic device. The vehicle may specifically be an electric car, etc.

[0073] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented by means of software plus necessary general hardware platforms, or by hardware. The technical solution in the present application, based on the existing hardware conditions, can use the current sampling module to collect the current value of the connected power branch, and use the calculation unit to calculate the current cumulative value of all power branches; and use the state latch unit to compare the current cumulative value with the preset overcurrent threshold, and when the current cumulative value is greater than the preset overcurrent threshold, disconnect the electrical connection of all power branches, and latch the electrical connection disconnection state of all power branches. The technical solution of the present invention can achieve a fast response to overcurrent faults through a hardware overcurrent shutdown circuit, meet the strict fault response time requirements of the redundant power supply of the wire-controlled chassis, and improve the stability of the power circuit. When controlling the disconnection of the electrical connection of all power branches, the shutdown state is latched by the state latch circuit, which can avoid the circuit from resetting and connecting itself after the current is normal during the overcurrent protection control process, and the frequent jump phenomenon of circuit connection and disconnection can ensure the stability of the power circuit connection and avoid the loss of circuit hardware.

[0074] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments herein, but will conform to the widest scope consistent with the principles and novel features applied for herein.

Claims

1. An overcurrent protection circuit, characterized in that: include: A plurality of current sampling modules and an overcurrent protection module, wherein the overcurrent protection module comprises an adder, a comparator and a state latch circuit; Each current sampling module in the multiple current sampling modules is used to collect the current value of the connected power supply branch; The input end of the adder is connected to the multiple current sampling modules, and is used to calculate the current accumulation value of all power supply branches; The input end of the comparator is connected to the output end of the adder, and is used to compare whether the current accumulated value exceeds a preset overcurrent threshold; The state latch circuit is connected to the output end of the comparator, and is used to control the disconnection of the electrical connections of all the power branches and latch the disconnection state of the electrical connections of all the power branches when the current accumulated value is greater than the preset overcurrent threshold.

2. The overcurrent protection circuit according to claim 1, characterized in that: The current sampling module includes a current sampling resistor and an operational amplifier; The two ends of the current sampling resistor are connected to the power supply branch, the positive input end and the negative input end of the operational amplifier are connected to the two ends of the current sampling resistor, the operational amplifier is used to collect the current value at the two ends of the current sampling resistor, and amplify the current value, the output end of the operational amplifier is connected to the input end of the adder as the output end of the current sampling module, and is used to input the amplified current value into the adder; The adder is used to accumulate and calculate the current values ​​of all power supply branches after the amplification process to obtain the accumulated current value of all power supply branches.

3. The overcurrent protection circuit according to claim 1, characterized in that: The overcurrent protection module also includes a load driving module; The output end of the load driving module is connected to each of the power supply branches, and the load driving module is used to provide driving enable for each of the power supply branches.

4. The overcurrent protection circuit according to claim 3, characterized in that: The input end of the load driving module is connected to the output end of the state latch circuit; The state latch circuit is used to send a drive signal to the load driving module when the current accumulated value is greater than the preset overcurrent threshold, and the drive signal is used to instruct to turn off the drive enable; The load driving module is used to shut down the driving enable provided to each of the power supply branches after receiving the driving signal.

5. The overcurrent protection circuit according to claim 4, characterized in that: The overcurrent protection module also includes a switch module, through which the output end of the load driving module is connected to each of the power supply branches, and the switch module is used to disconnect the electrical connection of each of the power supply branches when the load driving module turns off the drive enable.

6. The overcurrent protection circuit according to claim 4, characterized in that: The state latch circuit is also used to latch the drive signal when the load drive module turns off the drive enable, so as to latch the electrical disconnection state of all the power supply branches.

7. The overcurrent protection circuit according to any one of claims 4 to 6, characterized in that: The driving signal is a level signal for turning off the driving enable.

8. The overcurrent protection circuit according to claim 1, characterized in that: The overcurrent protection module comprises a main overcurrent protection module and at least one backup overcurrent protection module, wherein the main overcurrent protection module and the at least one backup overcurrent protection module respectively comprise the adder, the comparator and the state latch circuit; The main overcurrent protection module and the at least one backup overcurrent protection module are respectively connected to the multiple current sampling modules, and the at least one backup overcurrent protection module is used to perform overcurrent protection on the power supply when the main overcurrent protection module fails.

9. A vehicle-by-wire chassis, characterized in that: The vehicle-by-wire chassis comprises the overcurrent protection circuit according to any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle comprises the overcurrent protection circuit according to any one of claims 1 to 8 and the vehicle-by-wire chassis according to claim 9.

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