Power distribution circuit and power distribution box

Abstract

The invention discloses a power distribution circuit and a power distribution box. The power distribution circuit comprises a control module, a plurality of driving modules, a plurality of input interfaces and a plurality of output interfaces, the driving module is connected with at least one output interface; the driving module comprises at least one power transistor, the control module is connected with a control electrode of the power transistor, the control module is connected with the at least one input interface, and the control module is used for controlling the corresponding driving module to be switched on or switched off according to an input signal of the input interface; wherein the at least one driving module comprises a first group of transistors and a second group of transistors which are connected in series, and the control module is also used for determining that at least one of the first group of transistors and the second group of transistors meets a fault condition according to the first parameter information of the first group of transistors and the second parameter information of the second group of transistors. And controlling the first group of transistors and the second group of transistors to be turned off. According to the technical scheme, the reliability of the power distribution circuit is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution, and in particular to a power distribution circuit and a power distribution box. Background Art

[0002] The power distribution box, also known as the power switch box, can be used to distribute the input power to multiple output circuits according to different needs, providing power for different electrical equipment or circuits. For example, in a building, the power distribution box can distribute the total power from the power grid to the sockets, lighting and other circuits on each floor and in each room; or in a vehicle, the power distribution box can distribute the total power from the battery to each device in the vehicle.

[0003] However, the drive switch in the existing power distribution box is driven by a relay, the contacts of the relay are easily worn out and fail, and the contacts of the relay are easily adhered and burn the circuits and devices, and it is difficult to detect internal circuit failures in time.

[0004] Therefore, the existing power distribution box has the problem of being easy to fail and difficult to find faults in time. Summary of the invention

[0005] The present invention provides a power distribution circuit and a power distribution box to solve the problem that the power distribution box is prone to failure and it is difficult to find faults in time.

[0006] According to one aspect of the present invention, there is provided a power distribution circuit, the power distribution circuit comprising: a control module, a plurality of drive modules, a plurality of input interfaces and a plurality of output interfaces;

[0007] The driving module is connected to at least one of the output interfaces, and different driving modules correspond to different output interfaces; the driving module includes at least one power transistor, the control module is connected to the control electrode of the power transistor, the control module is connected to at least one of the input interfaces, and the control module is used to control the corresponding driving module to be turned on or off according to the input signal of the input interface;

[0008] Among them, at least one of the driving modules includes a first group of transistors and a second group of transistors connected in series, and the control module is also used to control the first group of transistors and the second group of transistors to be turned off when at least one of the first group of transistors and the second group of transistors meets a fault condition based on first parameter information of the first group of transistors and second parameter information of the second group of transistors.

[0009] Optionally, the first parameter information includes at least one of a first on-time, a first voltage drop value, and a first temperature value, and the second parameter information includes at least one of a second on-time, a second voltage drop value, and a second temperature value;

[0010] The driving module provided with the first group of transistors and the second group of transistors further includes at least one pre-driving chip, the pre-driving chip is connected to the control module, and the pre-driving chip is respectively connected to the control electrodes of the power transistors in the first group of transistors and the second group of transistors;

[0011] The control module is used to control the first group of transistors and the second group of transistors to be turned off when at least one of the first turn-on time of the first group of transistors and the second turn-on time of the second group of transistors is greater than a preset turn-on time;

[0012] And / or, the control module is used to obtain a first voltage drop value of a power transistor in the first group of transistors and a second voltage drop value of a power transistor in the second group of transistors through the pre-driver chip, and control the first group of transistors and the second group of transistors to be turned off when the difference between the first voltage drop value and the second voltage drop value is greater than a preset difference threshold;

[0013] And / or, the control module is used to obtain a first temperature value of the power transistors in the first group of transistors and a second temperature value of the power transistors in the second group of transistors through the pre-driver chip, and control the first group of transistors and the second group of transistors to be turned off when at least one of the first temperature value and the second temperature value is greater than a preset temperature threshold;

[0014] And / or, the control module is used to obtain the current value of the load corresponding to the first group of transistors and the second group of transistors through the pre-driver chip, and when the current value of the load is greater than a preset overload threshold or a preset short-circuit threshold, control the first group of transistors and the second group of transistors to be turned off.

[0015] Optionally, the first group of transistors includes two power transistors connected in parallel, and the second group of transistors includes two power transistors connected in parallel.

[0016] Optionally, the plurality of drive modules include at least one first drive module and at least one second drive module, and the power distribution circuit further includes a power interface, and the power interface is used to connect to a battery and / or an engine;

[0017] The first end of the first driving module is connected to the corresponding input interface, and the second end of the first driving module is connected to the corresponding output interface;

[0018] A first end of the second driving module is connected to the power interface, and a second end of the second driving module is connected to the corresponding output interface;

[0019] The first driving module includes a power transistor and an anti-reverse connection unit;

[0020] The power transistor and the anti-reverse connection unit are connected in series between the corresponding input interface and output interface; and the control end of the anti-reverse connection unit is connected to the control module.

[0021] Optionally, the anti-reverse connection unit includes a first anti-reverse connection transistor, and the first driving module also includes a first triode and a second triode;

[0022] The first electrode of the power transistor is connected to the corresponding input interface, the second electrode of the power transistor is connected to the first electrode of the first anti-reverse connection transistor, and the second electrode of the first anti-reverse connection transistor is connected to the corresponding output interface;

[0023] The control electrode of the first triode is connected to the control module, the first electrode of the first triode is grounded, and the second electrode of the first triode is connected to the control electrode of the power transistor;

[0024] The control electrode of the second transistor is connected to the control module, the first electrode of the second transistor is grounded, and the second electrode of the second transistor is connected to the control electrode of the first anti-reverse connection transistor.

[0025] Optionally, the anti-reverse connection unit includes a second anti-reverse connection transistor, and the first driving module further includes a sampling resistor, a differential amplifier, a third transistor and a first resistor;

[0026] The first electrode of the power transistor is connected to the corresponding input interface, the second electrode of the power transistor is connected to the first electrode of the second anti-reverse connection transistor, and the control electrode of the second anti-reverse connection transistor is connected to the control module;

[0027] The sampling resistor is connected between the second electrode of the second anti-reverse connection transistor and the corresponding output interface;

[0028] The first input end of the differential amplifier is connected to the first end of the sampling resistor, the second input end of the differential amplifier is connected to the second end of the sampling resistor, and the differential amplifier is used to obtain an actual voltage value corresponding to the actual current of the power transistor;

[0029] The control electrode of the third triode is connected to the output end of the differential amplifier, the first electrode of the third triode is grounded, the second electrode of the third triode is connected to the first power supply through the first resistor, and the third triode is used to shut down when the actual voltage value is greater than the preset value;

[0030] The control module is connected to the second electrode of the third triode, and is used for controlling the corresponding power transistor to turn off when determining that the third triode is turned off according to the voltage value of the second electrode of the third triode.

[0031] Optionally, the first anti-reverse connection transistor comprises a P-type transistor.

[0032] Optionally, the power distribution circuit further includes at least one insurance module;

[0033] The control end of the insurance module is connected to the control module, and the insurance module is connected between the power interface and the corresponding output interface;

[0034] The control module is used to control the fuse module to shut down when the current of the load connected to the fuse module exceeds a preset current threshold.

[0035] Optionally, the insurance module includes a protection transistor;

[0036] The control electrode of the protection transistor is connected to the control module, and the protection transistor is connected between the power interface and the corresponding output interface.

[0037] According to another aspect of the present invention, there is provided a power distribution box, the power distribution box comprising the power distribution circuit described in any embodiment of the present invention.

[0038] The technical solution of the embodiment of the present invention is to provide a power distribution circuit including multiple drive modules, so that voltage can be provided for multiple loads, and the power output of different drive modules can be different, so that different output interfaces are connected according to different load requirements, and then different drive modules are connected. In addition, the drive module includes at least one power transistor, which has no arc and no switch contacts, is not easy to wear, that is, it is not easy to fail, and will not stick to burn the circuit and the device, thereby improving the reliability of the power distribution circuit. In addition, at least one drive module includes a first group of transistors and a second group of transistors connected in series, for example, the drive module corresponding to the short-time drive (for example, the drive module corresponding to the preheating coil) includes a first group of transistors and a second group of transistors connected in series. In this way, when at least one of the first group of transistors and the second group of transistors fails, the control module can be informed in time, so as to control the first group of transistors and the second group of transistors to be turned off. In this way, the burn-out of the load due to long-term work heat during short-time drive can be solved, so that when the device fails, it can be known and eliminated in time, which is conducive to protecting the electrical devices and improving the reliability of the power distribution circuit.

[0039] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 It is a structural schematic diagram of a power distribution circuit provided by an embodiment of the present invention;

[0042] Figure 2 is a schematic diagram of a circuit structure of a driving module provided by an embodiment of the present invention;

[0043] Figure 3 is a schematic diagram of a circuit structure of another driving module provided by an embodiment of the present invention;

[0044] Figure 4 is a structural schematic diagram of another power distribution circuit provided by an embodiment of the present invention;

[0045] Figure 5 is a schematic diagram of a circuit structure of a first driving module provided in an embodiment of the present invention;

[0046] Figure 6 is a circuit structure diagram of another first driving module provided by an embodiment of the present invention;

[0047] Figure 7 It is a structural schematic diagram of a power distribution box provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0049] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0050] An embodiment of the present invention provides a power distribution circuit. The power distribution circuit can be arranged in a power distribution box. The power distribution box can be used in a vehicle or a building.

[0051] Figure 1 is a schematic diagram of a power distribution circuit provided by an embodiment of the present invention, with reference to Figure 1 , the power distribution circuit includes: a control module 110, a plurality of drive modules 120, a plurality of input interfaces A1 and a plurality of output interfaces A2;

[0052] The driving module 120 is connected to at least one output interface A2, and different driving modules 120 correspond to different output interfaces A2; the driving module 120 includes at least one power transistor, and the control module 110 is connected to the control electrode of the power transistor; the control module 110 is connected to at least one input interface A1, and the control module 110 is used to control the corresponding driving module 120 to be turned on or off according to the input signal of the input interface;

[0053] in, Figure 2 is a schematic diagram of a circuit structure of a driving module provided by an embodiment of the present invention, with reference to Figure 2 , at least one driving module 120 includes a first group of transistors 1201 and a second group of transistors 1202 connected in series, and the control module 110 is also used to control the first group of transistors 1201 and the second group of transistors 1202 to be turned off when it is determined that at least one of the first group of transistors 1201 and the second group of transistors 1202 meets a fault condition based on first parameter information of the first group of transistors 1201 and second parameter information of the second group of transistors 1202.

[0054] Among them, the output interface A2 can be used to connect the load. The driving module 120 can transmit the power supply voltage to the corresponding output interface A2, and the power supply voltage can be the total power supply voltage, such as the voltage provided by the battery or engine of the vehicle. The power supply voltage can also be other voltages, and different voltages can be connected according to needs, which is not limited in this embodiment. By setting different output interfaces A2 corresponding to different driving modules 120, driving modules 120 with different powers can be selected for output according to the different loads connected to the output interface A2, thereby meeting different needs. The control module 110 may include a single-chip microcomputer, a digital signal processor (Digital Signal Processor, DSP) or a field programmable gate array (FieldProgrammable Gate Array, FPGA) chip, etc. It should be noted that, Figure 1 The multiple control modules 110 shown in the figure are the same control module 110, and are shown separately to indicate that different driving modules 120 are connected to different pins of the same control module 110, and the input interfaces A1 connected to the control modules 110 corresponding to different driving modules 120 are different, that is, the control module 110 controls different driving modules 120 in response to different input signals.

[0055] Specifically, among the multiple input interfaces A1, some of the input interfaces A1 can be used to access the power supply voltage, and some of the input interfaces A1 can be used to access the input signal. Among the multiple drive modules 120, some of the drive modules 120 can be connected to the input interface A1, and some of the drive modules 120 can be connected to the power interface A0, and the power interface A0 is used to connect to the main power supply (such as the battery and / or engine of the vehicle), so that the drive module 120 is connected to the main power supply.

[0056] For example, the input signals corresponding to different drive modules 120 are different, and the control module 110 can control the corresponding drive module 120 to be turned on or off according to the input signal of the input interface. Exemplarily, for example, the power distribution circuit can be used in a vehicle. The input signal corresponding to the drive module 120 corresponding to the vehicle power supply of the vehicle can be the state signal of the vehicle start switch, and the control module 110 can control the drive module 120 corresponding to the vehicle power supply to be turned on or off according to the state signal of the vehicle start switch. Among them, the drive module 120 corresponding to the vehicle power supply of the vehicle, that is, the drive module 120 uses the power supply voltage provided by the battery and / or engine of the vehicle to power the vehicle load (such as the motor of the vehicle, etc.). For example, the input signal corresponding to the drive module 120 connected to the preheating coil of the vehicle can be the state signal of the preheating switch of the vehicle, and the control module 110 can control the conduction or shutoff of the drive module 120 corresponding to the preheating coil according to the state signal of the preheating switch. The input interface A1 and the output interface A2 of the power distribution circuit can be connected according to actual user needs, and this embodiment is not limited.

[0057] Specifically, the driving module 120 includes at least one power transistor, which may be a metal oxide semiconductor field effect transistor (MOS), an insulated gate bipolar transistor (IGBT), or a gallium nitride transistor, etc., which is not limited in this embodiment. In this way, the device in the driving module 120 has no arc and no switch contacts, and is not prone to wear, that is, it is not easy to implement, and will not cause adhesion and burn circuits and devices, thereby improving the reliability of the power distribution circuit.

[0058] Among them, at least one driving module 120 includes a first group of transistors 1201 and a second group of transistors 1202 connected in series, the first group of transistors 1201 includes at least one power transistor Q0, and the second group of transistors 1202 includes at least one power transistor Q0. For example, the driving module 120 corresponding to the short-time drive (for example, the driving module 120 corresponding to the preheating coil) includes a first group of transistors 1201 and a second group of transistors 1202 connected in series. In this way, when at least one of the first group of transistors 1201 and the second group of transistors 1202 fails, the control module 110 can be informed in time, so as to control the first group of transistors 1201 and the second group of transistors 1202 to turn off, that is, control the power transistors Q0 in the first group of transistors 1201 and the power transistors Q0 in the second group of transistors 1202 to turn off. When one of the groups of transistors breaks down, the circuit can be disconnected in time to achieve the effect of protecting the circuit and the device, and realize the double insurance setting. In this way, the problem of the load burning due to long-term work heat during short-term driving can be solved, so that when the device fails, it can be known and eliminated in time, which is beneficial to protecting electrical devices and improving the reliability of the power distribution circuit.

[0059] The technical solution of this embodiment is to provide a power distribution circuit including multiple drive modules, so that voltage can be provided for multiple loads, and the power output of different drive modules can be different, so that different output interfaces are connected according to different load requirements, and then different drive modules are connected. In addition, the drive module includes at least one power transistor, which has no arc and no switch contacts, is not easy to wear, that is, it is not easy to fail, and will not stick to burn the circuit and the device, thereby improving the reliability of the power distribution circuit. In addition, at least one drive module includes a first group of transistors and a second group of transistors connected in series, for example, the drive module corresponding to the short-time drive (for example, the drive module corresponding to the preheating coil) includes a first group of transistors and a second group of transistors connected in series. In this way, when at least one of the first group of transistors and the second group of transistors fails, the control module can be informed in time, so as to control the first group of transistors and the second group of transistors to turn off. In this way, the burn-out of the load due to long-term work heat during short-time drive can be solved, so that when the device fails, it can be known and eliminated in time, which is conducive to protecting the electrical devices and improving the reliability of the power distribution circuit.

[0060] Based on the above technical solution, optionally, the first parameter information includes at least one of a first on-time, a first voltage drop value and a first temperature value, and the second parameter information includes at least one of a second on-time, a second voltage drop value and a second temperature value.

[0061] Figure 3 is a schematic diagram of a circuit structure of another driving module provided in an embodiment of the present invention. Figure 3The driving module 120 provided with the first group of transistors 1201 and the second group of transistors 1202 further includes at least one pre-driving chip 1203, the pre-driving chip 1203 is connected to the control module 110, and the pre-driving chip 1203 is respectively connected to the control electrode of the power transistor Q0 in the first group of transistors 1201 and the second group of transistors 1202;

[0062] The control module 110 is used to control the first group of transistors 1201 and the second group of transistors 1202 to turn off when at least one of the first turn-on time of the first group of transistors 1201 and the second turn-on time of the second group of transistors 1202 is greater than a preset turn-on time;

[0063] And / or, the control module 110 is used to obtain a first voltage drop value of the power transistor Q0 in the first group of transistors 1201 and a second voltage drop value of the power transistor Q0 in the second group of transistors 1202 through the pre-driver chip 1203, and control the first group of transistors 1201 and the second group of transistors 1202 to be turned off when the difference between the first voltage drop value and the second voltage drop value is greater than a preset difference threshold;

[0064] And / or, the control module 110 is used to obtain a first temperature value of the power transistor Q0 in the first group of transistors 1201 and a second temperature value of the power transistor Q0 in the second group of transistors 1202 through the pre-driver chip 1203, and control the first group of transistors 1201 and the second group of transistors 1202 to be turned off when at least one of the first temperature value and the second temperature value is greater than a preset temperature threshold;

[0065] And / or, the control module 110 is also used to obtain the current value of the load corresponding to the first group of transistors 1201 and the second group of transistors 1202 through the pre-driver chip 1203, and when the current value of the load is greater than a preset overload threshold or a preset short-circuit threshold, control the first group of transistors 1201 and the second group of transistors 1202 to be turned off.

[0066] The pre-driver chip 1203 is a pre-driver chip, and the driver module 120 includes the pre-driver chip 1203 and its peripheral circuits. The pre-driver chip 1203 can receive a low-power, low-voltage control signal from the control module 110, process and amplify the control signal, and drive the power transistors (the power transistors in the first group of transistors 1201 and the second group of transistors 1202) to turn on and off.

[0067] Specifically, the control module 110 can time the on-time of the first group of transistors 1201 and the second group of transistors 1202. When at least one of the first on-time of the first group of transistors 1201 and the second on-time of the second group of transistors 1202 is greater than the preset on-time, the control module 110 controls the first group of transistors 1201 and the second group of transistors 1202 to be turned off, thereby performing timeout protection to prevent the load 200 corresponding to the first group of transistors 1201 and the second group of transistors 1202 from working for a long time and heating up, thereby preventing the load 200 from burning.

[0068] The control module 110 can obtain the first voltage drop value of the power transistor Q0 in the first group of transistors 1201 and the second voltage drop value of the power transistor Q0 in the second group of transistors 1202 through the pre-driver chip 1203. When the difference between the first voltage drop value and the second voltage drop value is greater than a preset difference threshold, for example, when the difference between the first voltage drop value of the power transistor Q0 in one group of transistors 1201 and the second voltage drop value of the power transistor Q0 in the second group of transistors 1202 is greater than 50% of the first voltage drop value or the second voltage drop value, it is determined that the power transistor with a larger voltage drop value is abnormal, and the first group of transistors 1201 and the second group of transistors 1202 are controlled to be turned off, so that when one group of transistors breaks down, the circuit can be disconnected in time to achieve the effect of protecting the circuit and the device, thereby realizing a double insurance setting.

[0069] For example, the pre-driver chip 1203 is connected to a temperature sensor, such as a thermistor RT, and the first pin AD_Temp of the pre-driver chip 1203 is connected to the control module 110. The control module 110 can obtain the first temperature value of the power transistor Q0 in the first group of transistors 1201 and the second temperature value of the power transistor Q0 in the second group of transistors 1202 through the pre-driver chip 1203, and when at least one of the first temperature value and the second temperature value is greater than a preset temperature threshold, the first group of transistors 1201 and the second group of transistors 1202 are controlled to be turned off to achieve over-temperature protection. For example, a thermistor RT is set, and the first temperature value and the second temperature value are the same value. In some other embodiments, a first thermistor can also be set near the first group of transistors 1201 to obtain the first temperature value of the power transistor Q0 in the first group of transistors 1201, and a second thermistor can be set near the second group of transistors 1202 to obtain the second temperature value of the power transistor Q0 in the second group of transistors 1202, which is not limited in this embodiment.

[0070] The pre-driver chip 1203 has an internal integrated differential circuit, and the control module 110 reads the current value of the load 200 through the differential circuit, and determines whether it exceeds the preset overload threshold. When it exceeds, the first group of transistors 1201 and the second group of transistors 1202 are controlled to be turned off for overload protection. When the current value of the load 200 exceeds the preset short-circuit threshold, the first group of transistors 1201 and the second group of transistors 1202 are controlled to be turned off for short-circuit protection.

[0071] In this way, the power distribution circuit has a complete dynamic monitoring function of temperature, current and voltage, and realizes over-voltage, over-current, timeout and over-temperature protection.

[0072] Optionally, refer to Figure 2 or Figure 3 The first transistor group 1201 includes two power transistors Q01 connected in parallel, and the second transistor group 1202 includes two power transistors Q02 connected in parallel. In this way, the output current of the first transistor group 1201 and the second transistor group 1202 can be increased, and the load capacity of the driving module 120 can be improved.

[0073] like Figure 3 As shown, in the first transistor group 1201, the sources of the two power transistors Q01 are connected, the gates of the two power transistors Q01 are connected, and the drains of the two power transistors Q01 are connected. In the second transistor group 1202, the sources of the two power transistors Q02 are connected, the gates of the two power transistors Q02 are connected, and the drains of the two power transistors Q02 are connected.

[0074] like Figure 3 As shown, the second pin Power of the pre-driver chip 1203 is connected to the source of the power transistor Q01 in the first group of transistors 1201, and is connected to the drain of the power transistor Q02 in the second group of transistors 1202, so as to facilitate the series connection of the first group of transistors 1201 and the second group of transistors 1202. The third pin Preheat of the pre-driver chip 1203 is connected to the source of the power transistor Q02 in the second group of transistors 1202, and the fourth pin Pow_preheat of the pre-driver chip 1203 is connected to the drain of the power transistor Q01 in the first group of transistors 1201. The pre-driver chip 1203 is also connected to the gate of the power transistor Q01 in the first group of transistors 1201 and the gate of the power transistor Q02 in the second group of transistors 1202. In this way, the driving control of the power transistor is realized.

[0075] like Figure 3As shown, the first end of the thermistor RT is connected to the second power supply VCC, and the second end of the thermistor RT is connected to the pre-driver chip 1203, so that the pre-driver chip 1203 obtains the voltage of the thermistor RT, and then determines the corresponding temperature value according to the relationship between the voltage and temperature of the thermistor RT. It should be noted that the second power supply VCC in this embodiment can be generated by a battery after passing through a voltage conversion circuit.

[0076] On the basis of the above technical solutions, Figure 4 is a schematic diagram of a structure of another power distribution circuit provided by an embodiment of the present invention. Figure 4 The plurality of drive modules 120 include at least one first drive module 121 and at least one second drive module 122, and the power distribution circuit further includes a power interface A0, and the power interface A0 is used to connect the battery 300 and / or the engine 400;

[0077] The first end of the first driving module 121 is connected to the corresponding input interface A1, and the second end of the first driving module 121 is connected to the corresponding output interface A2;

[0078] A first end of the second driving module 122 is connected to the power interface A0, and a second end of the second driving module 122 is connected to the corresponding output interface A2;

[0079] The first driving module 121 includes a power transistor Q1 and an anti-reverse connection unit 1211;

[0080] The power transistor Q1 and the reverse connection prevention unit 1211 are connected in series between the corresponding input interface A1 and output interface A2 ; the control end of the reverse connection prevention unit 1211 is connected to the control module 110 .

[0081] Among them, for example, the power distribution circuit is used in a vehicle. The power interface A0 is used to connect the main power supply, and the main power supply can be the battery 300 and / or the engine 400. A starting switch of the vehicle can also be set between the power interface A0 and the battery 300 and the engine 400. After the starting switch is closed, the battery 300 and the engine 400 supply power to the second drive module 122 through the power interface A0. The first end of the first drive module 121 is connected to the corresponding input interface A1, that is, the input interface A1 and the output interface A2 corresponding to the first drive module 121 can be selected and configured according to user needs, that is, the input interface A1 corresponding to the first drive module 121 is connected to the corresponding device or power line when it is used. The first end of the second drive module 122 is connected to the power interface A0, that is, the first end of the second drive module 122 is fixedly connected.

[0082] Specifically, by setting the first driving module 121 to include an anti-reverse connection unit 1211, it is possible to avoid reverse connection when the input interface A1 and the output interface A2 corresponding to the first driving module 121 are connected to a load or a power line in actual applications. When the input interface A1 and the output interface A2 corresponding to the first driving module 121 are connected to a load or a power line in reverse, the loop can be disconnected in time to avoid damage to the device.

[0083] The structure of the first driving module 121 is described below in conjunction with possible structures of the anti-reverse connection unit 1211 , but this is not intended to limit the present application.

[0084] In one embodiment, Figure 5 is a schematic diagram of a circuit structure of a first driving module provided in an embodiment of the present invention. Figure 5 , the anti-reverse connection unit 1211 includes a first anti-reverse connection transistor Q2, and the first driving module 121 also includes a first transistor Q11 and a second transistor Q12;

[0085] The first electrode of the power transistor Q1 is connected to the corresponding input interface A1, the second electrode of the power transistor Q1 is connected to the first electrode of the first anti-reverse connection transistor Q2, and the second electrode of the first anti-reverse connection transistor Q2 is connected to the corresponding output interface A2;

[0086] The control electrode of the first transistor Q11 is connected to the control module 110, the first electrode of the first transistor Q11 is grounded, and the second electrode of the first transistor Q11 is connected to the control electrode of the power transistor Q1;

[0087] The control electrode of the second transistor Q12 is connected to the control module 110 , the first electrode of the second transistor Q12 is grounded, and the second electrode of the second transistor Q12 is connected to the control electrode of the first reverse connection protection transistor Q2 .

[0088] The first electrode of the first anti-reverse connection transistor Q2 is a source electrode, and the second electrode of the first anti-reverse connection transistor Q2 is a drain electrode. Alternatively, the first electrode of the first anti-reverse connection transistor Q2 is a drain electrode, and the second electrode of the first anti-reverse connection transistor Q2 is a source electrode, which is not limited in this embodiment.

[0089] Specifically, after the control module 110 controls the first transistor Q11 to be turned on, the first transistor Q11 transmits the ground voltage to the control electrode of the power transistor Q1, so that the power transistor Q1 is turned on, and the power transistor Q1 outputs the voltage to the first electrode of the first anti-reverse connection transistor Q2. Similarly, after the control module 110 controls the second transistor Q12 to be turned on, the second transistor Q12 transmits the ground voltage to the control electrode of the first anti-reverse connection transistor Q2, so that the first anti-reverse connection transistor Q2 is turned on.

[0090] Since the second electrode of the first anti-reverse connection transistor Q2 is connected to the control electrode of the first anti-reverse connection transistor Q2, an anti-reverse connection diode is formed. When the input interface A1 and the output interface A2 are reversely connected, the voltage of the second electrode of the first anti-reverse connection transistor Q2 is greater than the voltage of the first electrode of the first anti-reverse connection transistor Q2, and the first anti-reverse connection transistor Q2 is not turned on, thereby achieving reverse connection protection.

[0091] The third electrode of the power transistor Q1 is connected to the control module 110 to transmit the feedback current to the control module 110 , so that the control module 110 monitors the current of the power transistor Q1 .

[0092] In another embodiment, Figure 6 is a schematic diagram of a circuit structure of another first driving module provided in an embodiment of the present invention. Optionally, refer to Figure 6 , the anti-reverse connection unit 1211 includes a second anti-reverse connection transistor Q3, and the first driving module 121 also includes a sampling resistor Rs, a differential amplifier U1, a third transistor Q13 and a first resistor R1;

[0093] The first electrode of the power transistor Q1 is connected to the corresponding input interface A1, the second electrode of the power transistor Q1 is connected to the first electrode of the second anti-reverse connection transistor Q3, and the control electrode of the second anti-reverse connection transistor Q3 is connected to the control module 110;

[0094] The sampling resistor Rs is connected between the second electrode of the second anti-reverse connection transistor Q3 and the corresponding output interface A2;

[0095] A first input terminal of the differential amplifier U1 is connected to a first terminal of the sampling resistor Rs, and a second input terminal of the differential amplifier U1 is connected to a second terminal of the sampling resistor Rs. The differential amplifier U1 is used to obtain an actual voltage value corresponding to an actual current of the power transistor Q1;

[0096] The control electrode of the third transistor Q13 is connected to the output end of the differential amplifier U1, the first electrode of the third transistor Q13 is grounded, the second electrode of the third transistor Q13 is connected to the first power supply VDD through the first resistor R1, and the third transistor Q13 is used to turn off when the actual voltage value is greater than the preset value;

[0097] The control module 110 is connected to the second electrode of the third triode Q13 , and is used for controlling the corresponding power transistor Q1 to turn off when the third triode Q13 is turned off according to the voltage value of the second electrode of the third triode Q13 .

[0098] For example, the first electrode of the second anti-reverse connection transistor Q3 is a source electrode, and the second electrode of the second anti-reverse connection transistor Q3 is a drain electrode. It should be noted that the first power source VDD in this embodiment can be generated by a battery through a voltage conversion circuit.

[0099] It can be known that the first power supply terminal of the differential amplifier U1 can be connected to the corresponding power supply voltage, and the second power supply terminal of the differential amplifier U1 is grounded.

[0100] Specifically, for example, the input interface A1 corresponding to the first pole of the power transistor Q1 is connected to the first power supply end of the load, the second power supply end of the load can be connected to a battery, and the output interface A2 corresponding to the second pole of the second anti-reverse connection transistor Q3 is grounded. The control module 110 transmits voltage to the control poles of the power transistor Q1 and the second anti-reverse connection transistor Q3, and controls the power transistor Q1 and the second anti-reverse connection transistor Q3 to be turned on. The power transistor Q1 and the second anti-reverse connection transistor Q3 form a back-to-back mode, and the second anti-reverse connection transistor Q3 acts as an anti-reverse connection diode. When the input interface A1 and the output interface A2 are not reversely connected, the second anti-reverse connection transistor Q3 is turned on. After the input interface A1 and the output interface A2 are reversely connected, the second anti-reverse connection transistor Q3 is not turned on, thereby achieving anti-reverse connection.

[0101] By setting the sampling resistor Rs and the differential amplifier U1, the differential amplifier U1 can obtain the voltage value across the sampling resistor Rs, that is, obtain the actual voltage value corresponding to the actual current of the power transistor Q1. When the actual voltage value output by the differential amplifier U1 is small (smaller than the preset value), the third transistor Q13 is turned on, the voltage of the second pole of the third transistor Q13 is small, and the control module 110 obtains a small voltage. When the actual voltage value output by the differential amplifier U1 is large (larger than the preset value), the third transistor Q13 is turned off, the voltage of the second pole of the third transistor Q13 is large, and the control module 110 obtains a large voltage. When the control module 110 obtains a large voltage from the second pole of the third transistor Q13, it is determined that the actual voltage value corresponding to the actual current value of the power transistor Q1 is large, that is, the actual current value of the power transistor Q1 is large, and the corresponding power transistor Q1 is controlled to be turned off to achieve overcurrent protection and short circuit protection.

[0102] Optionally, refer to Figure 6 The first driving module 121 also includes a composite transistor U2, which is connected between the control module 110 and the control electrode of the power transistor Q1, and can amplify the electrical signal output by the control module 110 to drive the power transistor Q1. The first power supply terminal of the composite transistor U2 is connected to the third power supply VSS, and the second power supply terminal of the composite transistor U2 is grounded.

[0103] Optionally, refer to Figure 6, the first driving module 121 further includes a second resistor R2 and a third resistor R3, the second resistor R2 is connected between the output end of the operational amplifier U1 and the first end of the third resistor R3, the second end of the third resistor R3 is grounded, and the control module 110 is connected to the first end of the third resistor R3. In this way, the control module 110 can obtain the actual voltage value output by the operational amplifier U1, thereby obtaining the actual current value of the power transistor Q1, and realizing the monitoring of the current of the power transistor Q1.

[0104] Optionally, refer to Figure 5 The first anti-reverse connection transistor Q2 includes a P-type transistor. The P-type transistor has a small tube voltage drop, which can reduce the voltage drop loss and facilitate the improvement of the driving power of the driving module 120.

[0105] Optionally, refer to Figure 4 , the power distribution circuit further includes at least one insurance module 130;

[0106] The control end of the insurance module 130 is connected to the control module 110, and the insurance module 130 is connected between the power interface A0 and the corresponding output interface A2;

[0107] The control module 110 is used to control the fuse module 130 to shut down when the current of the load connected to the fuse module 130 exceeds a preset current threshold.

[0108] Specifically, the output interface A2 corresponding to the insurance module 130 can be connected to a load, which can be an electrical device. By setting the insurance module 130, when the current of the load connected to the insurance module 130 exceeds the preset current threshold, the control module 110 controls the insurance module 130 to shut down, realizing overcurrent protection, and avoiding burning of electrical devices.

[0109] Optionally, refer to Figure 4 , the insurance module 130 includes a protection transistor Q4;

[0110] The control electrode of the protection transistor Q4 is connected to the control module 110 , and the protection transistor Q4 is connected between the power interface A0 and the corresponding output interface A2 .

[0111] In this way, when the current of the load is large, the power supply to the load can be stopped to achieve overcurrent protection and avoid burning of electrical components.

[0112] Optionally, refer to Figure 4 The power distribution circuit also includes a communication module 140, the control module 110 is connected to the communication module 140, and the communication module 140 is connected to the first communication interface B1 and the second communication interface B2.

[0113] Specifically, the communication module 140 may be a Controller Area Network (CAN) communication mode, and the communication module 140 may send or receive differential signals through the first communication interface B1 and the second communication interface B2. The control module 110 may communicate with other devices through the communication module 140, such as with the electronic controller or central controller of the vehicle. When the drive module 120 fails, a fault message may be sent through the communication module 140.

[0114] Based on the above technical solutions, the driving module 120 can be connected to a load through the output interface A2. The following describes possible types of loads, but does not limit the present application. In actual application, corresponding loads can be connected according to requirements.

[0115] Exemplarily, the load may be a preheating coil, such as Figure 4 As shown, the driving module 120 connected to the preheating coil includes a first power transistor K15, the control electrode of the first power transistor K15 is connected to the control module 110, the first electrode of the first power transistor K15 is connected to the power interface A0 through a fuse, the second electrode of the first power transistor K15 is connected to the preheating coil through the output interface A2, and the second electrode of the first power transistor K15 can also be connected to the control module 110 for preheating feedback. The input interface A1 connected to the control module 110 corresponding to the first power transistor K15 can include a low-side control signal input interface and two high-side control signal input interfaces. Among them, the output interface A2 connected to the preheating coil can be a terminal, so as to facilitate connection. The low-side control signal input interface is connected to the low-side control signal, and the low-side control signal is driven at a low level. The high-side control signal input interface is connected to the high-side control signal, and the high-side control signal is driven at a high level.

[0116] The first power transistor K15 may include a first group of transistors and a second group of transistors. When one group of transistors is broken down, the first group of transistors and the second group of transistors may be turned off in time to prevent the preheating coil from overheating and burning the vehicle.

[0117] For example, the load may be the entire vehicle load (i.e., all loads in the vehicle that require electricity), that is, the drive module 120 supplies power to the entire vehicle. Figure 4 As shown, the driving module 120 connected to the vehicle load includes a second power transistor K25, the control electrode of the second power transistor K25 is connected to the control module 110, the first electrode of the second power transistor K25 is connected to the power interface A0 through a fuse, and the second electrode of the second power transistor K25 is connected to the output interface A2.

[0118] Exemplarily, the load may be a first alarm shutdown state indicating device. Figure 4As shown, the driving module 120 connected to the first alarm shutdown status indicating device includes a third power transistor KT1, the control electrode of the third power transistor KT1 is connected to the control module 110, the first electrode of the third power transistor KT1 is connected to the power interface A0 through a fuse, and the second electrode of the third power transistor KT1 is connected to the output interface A2.

[0119] Exemplarily, the load may be a second alarm shutdown state indicating device. Figure 4 As shown, the driving module 120 connected to the second alarm shutdown status indicating device includes a fourth power transistor K19, the control electrode of the fourth power transistor K19 is connected to the control module 110, the first electrode of the fourth power transistor K19 is connected to the power interface A0 through a fuse, and the second electrode of the fourth power transistor K19 is connected to at least one output interface A2, so that at least one second alarm shutdown status indicating device can be connected to power the second alarm shutdown status indicating device.

[0120] Exemplarily, the load may be a third alarm shutdown state indicating device. Figure 4 As shown, the driving module 120 connected to the third alarm shutdown status indicating device includes a fifth power transistor K20 and an anti-reverse connection unit 1211, the control electrode of the fifth power transistor K20 is connected to the control module 110, the first electrode of the fifth power transistor K20 is connected to the input interface A1, and the second electrode of the fifth power transistor K20 is connected to the output interface A2 through the anti-reverse connection unit 1211.

[0121] For example, the load may be a fan. Figure 4 As shown, the driving module 120 connected to the fan includes a sixth power transistor K9, a control electrode of the sixth power transistor K9 is connected to the control module 110, a first electrode of the sixth power transistor K9 is connected to the power interface A0, and a second electrode of the sixth power transistor K9 is connected to the output interface A2.

[0122] For example, the load may be an electronic controller of a vehicle. Figure 4 As shown, the driving module 120 connected to the electronic controller includes a seventh power transistor K5, the control electrode of the seventh power transistor K5 is connected to the control module 110, the first electrode of the seventh power transistor K5 is connected to the power interface A0, and the second electrode of the seventh power transistor K5 is connected to at least one output interface A2, so as to supply power to the electronic controller when the seventh power transistor K5 is turned on. The input interface A1 of the control module 110 corresponding to the seventh power transistor K5 may include a low-side control signal input interface and a high-side control signal input interface.

[0123] For example, the load may be an engine of a vehicle, such as Figure 4As shown, the driving module 120 for providing low-speed power to the engine includes an eighth power transistor K6, the control electrode of the eighth power transistor K6 is connected to the control module 110, the first electrode of the eighth power transistor K6 is connected to the input interface A1, and the second electrode of the eighth power transistor K6 is connected to the output interface A2 through the anti-reverse connection unit 1211. The driving module 120 for providing high-speed power to the engine includes a ninth power transistor K7, the control electrode of the ninth power transistor K7 is connected to the control module 110, the first electrode of the ninth power transistor K7 is connected to the input interface A1, and the second electrode of the ninth power transistor K7 is connected to the output interface A2 through the anti-reverse connection unit 1211. When the low-speed switch of the engine is turned on, the eighth power transistor K6 is turned on to provide a slightly smaller power supply voltage to the engine, so that the engine runs at a low speed. When the high-speed switch of the transmitter is turned on, the ninth power transistor K7 is turned on to provide a larger power supply voltage to the engine, so that the engine runs at a high speed.

[0124] Exemplarily, the power distribution circuit may further include a spare drive module 120, such as Figure 4 As shown, the spare driving module 120 includes a tenth power transistor K16, the control electrode of the tenth power transistor K16 is connected to the control module 110, the first electrode of the tenth power transistor K16 is connected to the power interface A0, and the second electrode of the tenth power transistor K16 is connected to the output interface A2. The input interface A1 of the control module 110 corresponding to the tenth power transistor K16 may include a low-side control signal input interface and two high-side control signal input interfaces.

[0125] For example, Figure 4 As shown, the driving module 120 can be a start switch. The driving module 120 includes an eleventh power transistor K2, the control electrode of the eleventh power transistor K2 is connected to the control module 110, the first electrode of the eleventh power transistor K2 is connected to the power interface A0, and the second electrode of the eleventh power transistor K2 is connected to the output interface A2. The input interface A1 of the control module 110 corresponding to the eleventh power transistor K2 can include a low-side control signal input interface and two high-side control signal input interfaces.

[0126] For example, Figure 4As shown, the drive module 120 can be a neutral anti-repetition switch, that is, when the vehicle starts from neutral, the vehicle's starter motor is controlled to work at the moment of starting, and it is not allowed to work after the whole vehicle is detected to start, so as to avoid repeated control. That is, the load is the vehicle's starter motor. At the moment when the vehicle starts from neutral, the drive module 120 supplies power to the vehicle's starter motor, and stops supplying power after the whole vehicle starts. The drive module 120 includes a twelfth power transistor K10, the control electrode of the twelfth power transistor K10 is connected to the control module 110, the first electrode of the twelfth power transistor K10 is connected to the input interface A1, and the second electrode of the twelfth power transistor K10 is connected to the output interface A2 through the anti-reverse connection unit 1211. The input interface A1 of the control module 110 corresponding to the twelfth power transistor K10 may include a low-side control signal input interface and two high-side control signal input interfaces.

[0127] Optionally, a power switch may be provided between the power interface A0 and the storage battery 300, and the power interface A0 will be connected to the power voltage only after the power switch is turned on. The power interface A0 may be a terminal, so as to facilitate connection.

[0128] Optionally, the power distribution circuit may further include a grounding terminal 310 to facilitate grounding.

[0129] Optionally, at least one output interface A2 of the power distribution circuit may be a floating interface NC, which may be connected as required.

[0130] Optionally, the power distribution circuit also includes at least one fault indicator light. For example, each drive module 120 corresponds to a fault indicator light. When the drive module 120 fails, the control module 110 controls the corresponding fault indicator light to emit light, thereby providing a prompt to facilitate timely processing.

[0131] It should be noted that Figure 4 The multiple control modules 110 shown in the figure are the same control module 110, and are shown separately to indicate that different driving modules 120 are connected to different pins of the same control module 110, and the input interfaces A1 connected to the control modules 110 corresponding to different driving modules 120 are different, that is, the control module 110 controls different driving modules 120 in response to different input signals. Figure 4 The power transistor in the figure is for illustration only and does not limit the structure of the power transistor.

[0132] It should be noted that the power transistor in the driving module 120 may be an N-type transistor or a P-type transistor, which is not limited in this embodiment.

[0133] The embodiment of the present invention further provides a power distribution box, Figure 7 is a schematic diagram of the structure of a power distribution box provided by an embodiment of the present invention, such as Figure 7 As shown, the power distribution box 100 includes the power distribution circuit provided by any embodiment of the present invention. Therefore, the power distribution box 100 has the same beneficial effects as the power distribution circuit provided by any embodiment of the present invention, which will not be described in detail here.

[0134] For example, Figure 7 As shown, a plurality of binding posts 101 may be provided on the box body of the power distribution box 100, one of which is a grounding binding post 310, and one of which is used as an input interface A1 of the power distribution circuit.

[0135] The plurality of binding posts may include binding posts connected to the output interface A2 in the power distribution circuit, or a portion of the binding posts 101 may be the output interface A2 in the power distribution circuit, so as to facilitate connection with the load. In some embodiments, a portion of the binding posts 101 may be the input interface A1 in the power distribution circuit, so as to facilitate flexible connection of the input power supply.

[0136] The fault indicator light 102 in the power distribution circuit is located on the box body of the power distribution box. For example, each drive module 120 corresponds to a fault indicator light 102. When the drive module 120 fails, the control module 110 controls the corresponding fault indicator light 102 to light up, thereby providing a prompt to facilitate timely processing.

[0137] The embodiment of the present invention further provides a vehicle, which includes the power distribution box provided by any embodiment of the present invention. Therefore, the vehicle has the same beneficial effects as the power distribution box provided by any embodiment of the present invention, which will not be described in detail here.

[0138] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power distribution circuit, characterized in that: include: A control module, multiple drive modules, multiple input interfaces and multiple output interfaces; The driving module is connected to at least one of the output interfaces, and different driving modules correspond to different output interfaces; The driving module includes at least one power transistor, the control module is connected to the control electrode of the power transistor, the control module is connected to at least one of the input interfaces, and the control module is used to control the corresponding driving module to be turned on or off according to the input signal of the input interface; Among them, at least one of the driving modules includes a first group of transistors and a second group of transistors connected in series, and the control module is also used to control the first group of transistors and the second group of transistors to be turned off when at least one of the first group of transistors and the second group of transistors meets a fault condition based on first parameter information of the first group of transistors and second parameter information of the second group of transistors.

2. The power distribution circuit according to claim 1, characterized in that: The first parameter information includes at least one of a first on-time, a first voltage drop value, and a first temperature value, and the second parameter information includes at least one of a second on-time, a second voltage drop value, and a second temperature value; The driving module provided with the first group of transistors and the second group of transistors further includes at least one pre-driving chip, the pre-driving chip is connected to the control module, and the pre-driving chip is respectively connected to the control electrodes of the power transistors in the first group of transistors and the second group of transistors; The control module is used to control the first group of transistors and the second group of transistors to be turned off when at least one of the first turn-on time of the first group of transistors and the second turn-on time of the second group of transistors is greater than a preset turn-on time; And / or, the control module is used to obtain a first voltage drop value of a power transistor in the first group of transistors and a second voltage drop value of a power transistor in the second group of transistors through the pre-driver chip, and control the first group of transistors and the second group of transistors to be turned off when the difference between the first voltage drop value and the second voltage drop value is greater than a preset difference threshold; And / or, the control module is used to obtain a first temperature value of the power transistors in the first group of transistors and a second temperature value of the power transistors in the second group of transistors through the pre-driver chip, and control the first group of transistors and the second group of transistors to be turned off when at least one of the first temperature value and the second temperature value is greater than a preset temperature threshold; And / or, the control module is used to obtain the current value of the load corresponding to the first group of transistors and the second group of transistors through the pre-driver chip, and when the current value of the load is greater than a preset overload threshold or a preset short-circuit threshold, control the first group of transistors and the second group of transistors to be turned off.

3. The power distribution circuit according to claim 1, characterized in that: The first group of transistors includes two power transistors connected in parallel, and the second group of transistors includes two power transistors connected in parallel.

4. The power distribution circuit according to claim 1, characterized in that: The plurality of drive modules include at least one first drive module and at least one second drive module, and the power distribution circuit further includes a power interface, and the power interface is used to connect to a battery and / or an engine; The first end of the first driving module is connected to the corresponding input interface, and the second end of the first driving module is connected to the corresponding output interface; A first end of the second driving module is connected to the power interface, and a second end of the second driving module is connected to the corresponding output interface; The first driving module includes a power transistor and an anti-reverse connection unit; The power transistor and the anti-reverse connection unit are connected in series between the corresponding input interface and output interface; and the control end of the anti-reverse connection unit is connected to the control module.

5. The power distribution circuit according to claim 4, characterized in that: The anti-reverse connection unit includes a first anti-reverse connection transistor, and the first driving module also includes a first triode and a second triode; The first electrode of the power transistor is connected to the corresponding input interface, the second electrode of the power transistor is connected to the first electrode of the first anti-reverse connection transistor, and the second electrode of the first anti-reverse connection transistor is connected to the corresponding output interface; The control electrode of the first triode is connected to the control module, the first electrode of the first triode is grounded, and the second electrode of the first triode is connected to the control electrode of the power transistor; The control electrode of the second transistor is connected to the control module, the first electrode of the second transistor is grounded, and the second electrode of the second transistor is connected to the control electrode of the first anti-reverse connection transistor.

6. The power distribution circuit according to claim 4, characterized in that: The anti-reverse connection unit includes a second anti-reverse connection transistor, and the first driving module also includes a sampling resistor, a differential amplifier, a third transistor and a first resistor; The first electrode of the power transistor is connected to the corresponding input interface, the second electrode of the power transistor is connected to the first electrode of the second anti-reverse connection transistor, and the control electrode of the second anti-reverse connection transistor is connected to the control module; The sampling resistor is connected between the second electrode of the second anti-reverse connection transistor and the corresponding output interface; The first input end of the differential amplifier is connected to the first end of the sampling resistor, the second input end of the differential amplifier is connected to the second end of the sampling resistor, and the differential amplifier is used to obtain an actual voltage value corresponding to the actual current of the power transistor; The control electrode of the third triode is connected to the output end of the differential amplifier, the first electrode of the third triode is grounded, the second electrode of the third triode is connected to the first power supply through the first resistor, and the third triode is used to shut down when the actual voltage value is greater than the preset value; The control module is connected to the second electrode of the third triode, and is used for controlling the corresponding power transistor to turn off when determining that the third triode is turned off according to the voltage value of the second electrode of the third triode.

7. The power distribution circuit according to claim 5, characterized in that: The first reverse connection protection transistor comprises a P-type transistor.

8. The power distribution circuit according to any one of claims 1 to 7, characterized in that: The power distribution circuit also includes at least one insurance module; The control end of the insurance module is connected to the control module, and the insurance module is connected between the power interface and the corresponding output interface; The control module is used to control the fuse module to shut down when the current of the load connected to the fuse module exceeds a preset current threshold.

9. The power distribution circuit according to claim 8, characterized in that: The insurance module includes a protection transistor; The control electrode of the protection transistor is connected to the control module, and the protection transistor is connected between the power interface and the corresponding output interface.

10. A power distribution box, characterized in that: Comprising the power distribution circuit as described in any one of claims 1-9.

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