CN114475484A - A kind of automobile electrical system and automobile - Google Patents

Abstract

The invention discloses an automobile electrical system and an automobile, comprising: the automobile electric system also comprises a direct current converter, a first isolation circuit and a second isolation circuit; the first end of the first isolation circuit and the first end of the second isolation circuit are both connected with the first battery, and the second end of the first isolation circuit and the second end of the second isolation circuit are both connected with the first side of the direct current converter; the second battery is connected with the second side of the direct current converter; the third end of the second isolation circuit is respectively connected with a plurality of electric devices; the first isolation circuit comprises at least one first isolation device and is used for turning off the corresponding first isolation device when the voltage abrupt change of one side of the direct current converter is detected, so that the voltage between the first side and the second side of the direct current converter is isolated. The invention can avoid the adverse effect of the voltage fluctuation of the power grid on the electric equipment and ensure the safety of the automobile power supply network.

Description

A kind of automobile electrical system and automobile

technical field

The invention relates to the technical field of automobiles, in particular to an automobile electrical system and an automobile.

Background technique

At present, fuel passenger vehicles generally use a single 12V lead-acid battery. This kind of automotive electrical system cannot avoid that after high-power electrical appliances and electronic controllers share a power supply, the fluctuation of power consumption of high-power electrical appliances will cause interference to the electronic controller. . And due to the rapid development of new technologies such as smart cockpits, the requirements for the stability and safety of the power grid of the vehicle are also getting higher and higher. and safety requirements.

At present, some schemes have mentioned the use of redundant power supply network as the power supply network. Although this type of power supply network can also solve the problem of interference to the electronic controller caused by the fluctuation of power consumption of high-power electrical appliances when a power supply is shared, the current Some solutions do not solve the problem of how to effectively isolate the impact of voltage disturbance on another power supply and related circuits when a voltage disturbance occurs in a power supply or its associated circuit, which makes it difficult to provide stable power supply to electrical equipment. .

SUMMARY OF THE INVENTION

The invention provides an automobile electrical system and an automobile, which solves the problem that in a redundant power supply network, when a certain power supply or an associated circuit connected to it has a voltage disturbance phenomenon, another power supply and an associated circuit will be subject to voltage disturbance, resulting in The technical problem that it is difficult to provide stable power supply for electrical equipment.

According to an aspect of the present invention, an automotive electrical system is provided, comprising:

at least two batteries, the at least two batteries include a first battery and a second battery, and the vehicle electrical system further includes a DC converter and a first isolation circuit;

The first end of the first isolation circuit is connected to the first battery, the second end of the first isolation circuit is connected to the first side of the DC converter; the second battery is connected to the DC converter second side;

The first isolation circuit includes at least one first isolation device, which is used to turn off the corresponding first isolation device when a sudden voltage change occurs on one side of the DC converter, so that the DC converter is Voltage isolation between the first side and the second side.

Optionally, it further includes a second isolation circuit, the first end of the second isolation circuit is connected to the first battery, the second end of the second isolation circuit is connected to the first side of the DC converter, so The third end of the second isolation circuit is connected to a plurality of electrical equipment;

The second isolation circuit includes at least one second isolation device for blocking the flow of current on one side of the second isolation circuit to the other side of the second isolation circuit, while allowing the first battery and all The second battery supplies power to the electrical equipment through the second isolation device.

Optionally, the first isolation circuit includes a first electronic switch and a second electronic switch connected in series; the first electronic switch and the second electronic switch are connected in opposite directions.

Optionally, both the first electronic switch and the second electronic switch include a MOS tube and a third diode, the gate of the MOS tube is connected to the control side of the DC converter, and the source is connected to the The anode of the third diode is connected to the drain, and the cathode of the third diode is connected to the drain.

Optionally, the second isolation circuit includes a first diode and a second diode;

The anode of the first diode is connected to the first end of the DC converter, the cathode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is connected to the first battery.

Optionally, the cathodes of the first diode and the second diode are both connected to one end of the fuse, and the other end of the fuse is connected to the electrical equipment.

Optionally, the first isolation circuit includes a third electronic switch, one end of the third electronic switch is connected to the first end of the DC converter, and the other end is connected to the first battery.

Optionally, the first isolation circuit includes at least one fuse, one end of the fuse is connected to the first end of the DC converter, and the other end is connected to the first battery.

Optionally, the power supply voltage of the first battery is lower than the power supply voltage of the second battery; the first battery is a 12V power supply battery, the second battery is a 24V power supply battery, the first battery and the The second battery is a lithium battery.

According to another aspect of the present invention, an automobile is provided, including a starter, a generator, and an automobile electrical system provided in the first aspect of the present application, and the second battery is connected to the starter and the generator.

In the technical solution of the embodiment of the present invention, through the isolation effect of the first isolation circuit, when a sudden change in voltage on one side of the DC converter is detected, the corresponding first isolation device is turned off, so that the fluctuating voltage on one side of the DC converter does not change. It will affect the grid on the other side of the DC converter.

It should be understood that the content described in this section is not intended to identify key or critical features of the embodiments of the invention, nor is it intended to limit the scope of the invention. Other features of the present invention will become readily understood from the following description.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a system architecture diagram of an automotive electrical system provided according to Embodiment 1 of the present invention;

2 is a system architecture diagram of an automotive electrical system to which Embodiment 2 of the present invention is applicable;

3 is a system architecture diagram of an automotive electrical system to which Embodiment 3 of the present invention is applicable;

4 is a schematic diagram of a specific connection relationship between a first isolation circuit and a second isolation circuit of an automotive electrical system applicable in Embodiment 3;

5 is a schematic diagram of a system architecture of an automotive electrical system according to Embodiment 4 of the present invention;

6 is a schematic diagram of a system architecture of an automotive electrical system according to Embodiment 5 of the present invention;

FIG. 7 is a schematic diagram of a system architecture of an automotive electrical system according to Embodiment 6 of the present invention.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments are part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

Example 1

FIG. 1 is a system architecture diagram of an automotive electrical system provided in Embodiment 1 of the present invention, and this embodiment can be applied to an electric control system of an automobile. As shown in Figure 1, the system includes:

At least two batteries, the at least two batteries include a first battery 1 and a second battery 2, and the automotive electrical system also includes a DC converter 3 and a first isolation circuit 4;

The first end of the first isolation circuit 4 is connected to the first battery 1, the second end of the first isolation circuit 4 is connected to the first side of the DC converter 3; the second battery 2 is connected to the second side of the DC converter 3;

Specifically, it can be seen from FIG. 1 that the first battery 1 is connected to the first end of the first isolation circuit 4; the first side of the DC converter 3 is connected to the second end and the second end of the first isolation circuit 4; the second battery 2 is connected to the second side of the DC converter 3, so that the voltage of the second battery 2 can be converted by the DC converter 3 to obtain a voltage that can be used to supply power to electrical equipment.

The first isolation circuit 4 includes at least one first isolation device, which is used to turn off the corresponding first isolation device when it is detected that a voltage mutation occurs on one side of the DC converter 3, so that the first side of the DC converter 3 is connected to the first isolation device. Voltage isolation between the two sides.

Specifically, the first isolation circuit 4 may include at least one first isolation device, which is used to turn on and off the circuit in time. For example, when the vehicle is running normally, the voltage on both sides of the DC converter 3 is stable and can be controlled The first isolation circuit 4 is in a conducting state, so that both the first battery 1 and the second battery 2 can supply power to the electrical equipment. When the voltage of the power grid on the first side of the DC converter 3 drops due to the startup of the electrical equipment, the second battery 2 can convert the voltage of the DC converter 3 to provide stable power supply for the electrical equipment.

In addition, when the load switch on one side of the DC converter 3 is disconnected or a high voltage pulse is generated, a sudden voltage will be generated, and in order to prevent the voltage on one side of the DC converter 3 from being transferred to the other side of the DC converter 3 , the first isolation circuit 4 can be disconnected so that the voltage between the first side and the second side of the DC converter 3 is isolated.

In the technical solution of the embodiment of the present invention, through the isolation effect of the first isolation circuit, when a sudden change in voltage on one side of the DC converter is detected, the corresponding first isolation device is turned off, so that the fluctuating voltage on one side of the DC converter does not change. It will affect the grid on the other side of the DC converter.

Embodiment 2

FIG. 2 is a system architecture diagram of an automotive electrical system according to Embodiment 2 of the present invention. Based on Embodiment 1, this embodiment further discloses a second isolation circuit. As shown in FIG. 2 , the system also includes a second isolation circuit 5 .

The second isolation circuit 5 includes at least one second isolation device, which is used to block the current on one side of the second isolation circuit 5 from flowing into the other side of the second isolation circuit 5, and simultaneously make the first battery 1 and the second battery 3 both The powered device is powered through the second isolation device.

Specifically, the second isolation circuit 5 may include at least one isolation device, the first end of the second isolation circuit 5 is connected to the first battery 1 , the second end is connected to the first end of the DC converter 3 , and the third end is connected to the electrical equipment . The second isolation circuit 5 can block the transfer of the voltage on one side of the DC converter 3 to the other side of the DC converter 3 . If there is no second isolation circuit 5, when either side of the DC converter 3 is short-circuited to ground, the current can flow directly to the ground side, then the first battery 1 and the second battery 2 will not be able to Powered by electrical equipment.

In addition, the second isolation device in the second isolation circuit 5 can also provide a conduction function for the first battery 1 and the second battery 2 respectively, so that the first battery 1 and the second battery 2 can be used for electrical equipment respectively. powered by. If an open-circuit fault occurs in the first isolation circuit 4, the first battery 1 and the second battery 2 can also supply power to the electrical equipment, so that the running time of the related electrical appliances of the vehicle can be prolonged, so as to facilitate the vehicle and the driver to take corresponding measures, Rather than an emergency caused by a sudden power outage.

In this embodiment, the current on one side of the second isolation circuit is blocked from flowing into the other side of the second isolation circuit by the second isolation circuit, so as to play the role of short-circuit protection; and the second isolation circuit can also play the role of power supply conduction, The first battery and the second battery can supply power to the electrical equipment through the second isolation device of the second isolation circuit.

Embodiment 3

FIG. 3 is a system architecture diagram of an automotive electrical system according to Embodiment 2 of the present invention. This embodiment further discloses the specific structures of the first isolation circuit and the second isolation circuit on the basis of the foregoing embodiment. As shown in Figure 3, the first isolation circuit in the system specifically includes:

The first electronic switch 41 and the second electronic switch 42 are connected in series; the first electronic switch 41 and the second electronic switch 42 are connected in opposite directions.

It should be noted that the specific structures of the first electronic switch and the second electronic switch used in this embodiment are the same, and both include a MOS tube and a third diode, and the gate of the MOS tube is connected to the control side of the DC converter , the source is connected to the anode of the third diode, and the drain is connected to the cathode of the third diode.

Wherein, the first electronic switch 41 and the second electronic switch 42 are mutually inversely connected, specifically including two cases. The first case includes: the anode of the third diode of the first electronic switch 41 is connected to the anode of the third diode of the second electronic switch 42, and the source of the MOS transistor in the first electronic switch 41 is also connected to the second electronic switch 42. The sources of the MOS transistors in the electronic switch 42 are connected to each other. The second case includes: the negative electrode of the third diode of the first electronic switch 41 is connected to the negative electrode of the third diode of the second electronic switch 42, and the drain of the MOS transistor in the first electronic switch 41 is also connected to the second electronic switch 42. The drains of the MOS transistors in the electronic switch 42 are connected to each other. In both cases, when the first electronic switch 41 and the second electronic switch 42 are turned off, the first isolation circuit is in an off state.

Specifically, as shown in the connection mode of the first isolation circuit and the second isolation circuit shown in FIG. 4 , the drain of the MOS transistor in the first electronic switch 41 is connected to the first side of the DC converter 3 , in the first electronic switch 41 The source of the MOS tube is connected to the source of the MOS tube in the second electronic switch 42, and the drain of the MOS tube in the second electronic switch 42 is connected to the first battery 1, so that when the first electronic switch 41 and the second electronic switch 42 When both are turned off, the first isolation circuit 4 is in an off state; when the first electronic switch 41 is turned on and the second electronic switch 42 is turned off, the current flowing from the DC converter 3 to the first isolation circuit 4 can pass through, The current flowing from the first battery 1 to the first isolation circuit 4 cannot pass through; when the second electronic switch 42 is turned on and the first electronic switch 41 is turned off, the current flowing from the DC converter 3 to the first isolation circuit 4 cannot pass through , and the current flowing from the first battery 1 to the first isolation circuit 4 can pass; when both the first electronic switch 41 and the second electronic switch 42 are turned on, the first isolation circuit is in a bidirectional conduction state. When another connection method is adopted, that is, the source of the MOS transistor in the first electronic switch 42 is connected to the first side of the DC converter 3 , the drain of the MOS transistor in the first electronic switch 41 is connected to the drain of the MOS transistor in the second electronic switch 42 . When the drain of the MOS tube is connected, and the source of the MOS tube in the second electronic switch 42 is connected to the first battery 1, then when the first electronic switch 41 and the second electronic switch 42 are both turned off, the first isolation circuit 4 In the off state; when the first electronic switch 41 is turned on and the second electronic switch 42 is turned off, the current flowing from the DC converter 3 to the first isolation circuit 4 cannot pass through, but flows from the first battery 1 to the first isolation circuit 4 can pass through; when the second electronic switch is turned on and the first electronic switch 41 is turned off, the current flowing from the DC converter 3 to the first isolation circuit 4 can pass through, and from the first battery 1 to the first isolation circuit 4 cannot pass through; when both the first electronic switch 41 and the second electronic switch 42 are turned on, the first isolation circuit is in a bidirectional conduction state.

In the present application, when the electric vehicle system of the vehicle is in normal operation, both the first electronic switch 41 and the second electronic switch 42 are in the conducting state. At this time, the current can pass through the first electronic switch 41 and the second electronic switch 42 The MOS transistor is used to avoid excessive heating of the diodes in the first electronic switch 41 and the second electronic switch 42 when a large current occurs in the electrical system.

In addition, since the gate of the MOS tube is connected to the control side of the DC converter, when a sudden change of voltage occurs on one side of the DC converter, the DC converter can control the corresponding electronic switch, so that the first side of the DC converter and the Voltage isolation between the second sides. For example, when the vehicle is running, when the voltage on the 12V side provided by the first battery drops due to the turn-on of the 12V electrical equipment (for example, lower than 12.5V), the DC converter can send a control signal to the first electronic switch and the first electronic switch. The gate of the MOS tube of the electronic switch, the first electronic switch and the second electronic switch are controlled to be turned on. At this time, the 24V voltage provided by the second battery passes through the step-down function of the DC converter, and delivers 12.5V to 12V The low-voltage side is used to maintain the stable power supply of 12.5V on the low-voltage side; if the load switch of the 12V power grid is disconnected, resulting in a sudden voltage change, such as a reverse -4V voltage, when the DC converter detects a negative voltage Then, a control signal is sent to the gate of the second electronic switch, so that the second electronic switch is turned off, so that the -4V voltage on the low voltage side will not be transmitted to the inside of the DC converter and the high voltage 24V side.

Similarly, if the high voltage pulse generated by the 24V high voltage side generated by the second battery 2 is coupled, it is also possible to generate a high voltage higher than 15V to the low voltage side of the DC converter 3. When the DC converter 3 detects a high voltage , a control signal can be sent to the gate of the MOS transistor in the first electronic switch, so that the first electronic switch is controlled to be turned off, so that the high voltage will not be transmitted to the low-voltage side power grid.

In a specific embodiment, the second isolation circuit includes a first diode and a second diode;

The anode of the first diode is connected to the first end of the DC converter, the cathode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is connected to the first battery.

It should be noted that in this application, the anode of the first diode is connected to the first end of the DC converter, the cathode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is connected to the first end of the DC converter. The battery is connected in such a way that the current on one side of the second isolation circuit 5 is blocked from flowing into the other side of the second isolation circuit 5 .

Specifically, if a short-to-ground fault occurs on either side near the first battery 1 or near the second battery 2, due to the existence of the first diode and the second diode, the unidirectional conduction characteristics of the first battery or The current generated by the second battery will not flow from one side of the second isolation circuit 5 to the other side, so as to achieve the function of short circuit protection. However, if the first diode and the second diode do not exist, the current on one side of the second isolation circuit 5 will flow to the other side. At this time, the first battery 1 or the second battery 2 is directly grounded, so that the Can supply power to electrical equipment.

In a specific embodiment, the cathodes of the first diode and the second diode are both connected to one end of the fuse, and the other end of the fuse is connected to the electrical equipment.

It should be noted that since the anode of the first diode is connected to the first end of the DC converter, the anode of the second diode is connected to the first battery, and the cathodes of the first diode and the second diode are both connected One end of the fuse and the other end of the fuse are connected to the electrical equipment, so that both the first battery 1 and the second battery 2 can supply power to the electrical equipment through a diode. For example, as shown in the circuit diagram in FIG. 4, when the first electronic switch 41 has an open-circuit fault, at this time, the power generated by the second power supply 2 will not be transmitted to the electrical equipment, and due to the first diode and the second two The existence of the pole tube enables the first power supply 1 to still supply power to the electrical equipment normally; similarly, when the second electronic switch 42 has an open-circuit fault, at this time, the electrical energy generated by the first power supply 1 will not be transmitted to the electrical equipment. Due to the existence of the first diode and the second diode, the second power supply 2 can still supply power to the electrical equipment normally; thus, the running time of the vehicle-related electrical appliances can be prolonged, so as to facilitate the vehicle and the driver to take The corresponding measures, rather than the emergency caused by the sudden power failure, ensure the safety of the electrical equipment such as the emergency data record box and the automobile electronic controller.

In a specific embodiment, the supply voltage of the first battery 1 is lower than the supply voltage of the second battery.

Specifically, the first battery is a 12V power supply battery, the second battery 2 is a 24V power supply battery, and the first battery 1 and the second battery 2 are lithium batteries.

It should be noted that the first battery 1 of the present invention adopts a 12V lithium battery, the second battery 2 adopts a 24V lithium battery, and the 12V lithium battery is mainly connected to a low-voltage power supply device for supplying power to a low-voltage electrical device. The 24V lithium battery connection can connect the starter and generator to start the internal combustion engine, thereby starting the car, and obtain mechanical energy through the front-end drive system of the internal combustion engine - the drive pulley, which is then converted into 24V direct current and sent to the 24V lithium battery. Storage; since the 12V lithium battery will lose power at low temperature, it is difficult to use the 12V lithium battery as the starting power for the starter at low temperature. Therefore, the present invention can use the 24V lithium battery as the starting power for the starter, while the 12V lithium battery The cost of lithium batteries is lower, so 12V lithium batteries can be used to power 12V electrical equipment. The electrical equipment in the present invention may include an emergency event data recording box EDR, a 12V electrical appliance, and an automotive electronic controller ECU (the electronic controller is used to control the driving of the vehicle - the controller of the engine, transmission and brake, etc.) and the like.

In the technical solution of the embodiment of the present invention, through the isolation function of the first electronic switch 41 and the second electronic switch 42, when a sudden change in voltage on one side of the DC converter is detected, the corresponding first isolation device is turned off, so that the DC The fluctuating voltage on one side of the converter will not affect the power grid on the other side of the DC converter, so as to avoid the adverse effects on the electronic controller caused by the fluctuation of the electrical appliance on the power grid. The second isolation circuit composed of the first diode and the second diode blocks the current on one side of the second isolation circuit from flowing into the other side of the second isolation circuit, so as to play the role of short-circuit protection; The unidirectional conduction effect of the pole tube and the second diode can also enable both the first battery and the second battery to supply power to the electrical equipment, so as to ensure the electrical safety of the electrical equipment.

Embodiment 4

FIG. 5 is a system architecture diagram of an automotive electrical system according to Embodiment 3 of the present invention. As shown in FIG. 5 , the first isolation circuit in the system includes a third electronic switch 43 , one end of the third electronic switch 43 is connected to the first end of the DC converter 3 , and the other end is connected to the first battery 1 . The structure of the second isolation circuit 5 is the same as that of the second isolation circuit 5 in the third embodiment, including a first diode and a second diode, and the anode of the first diode is connected to the first diode of the DC converter 3 . At one end, the cathode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is connected to the first battery 1 .

When only one third electronic switch 43 is provided in this embodiment, the current generated by the first battery 1 or the second battery 2 flows to the other side due to the orientation of the diode in the electronic switch. For example, as shown in FIG. 3 , the anode of the diode in the third electronic switch 43 is connected to the first battery 1 , so that the current generated by the first battery 1 can flow to the DC converter 3 through the third electronic switch 43 . The stable operation of the power supply side of the first battery 1 can be protected. Similarly, if the anode of the diode in the third electronic switch 43 is connected to the DC converter 3, the current generated by the second battery 2 can flow to the first battery 1 after passing through the DC converter 3, so that the DC converter 3 and the second battery can be protected. The stable operation of the power supply side of the second battery 2.

Embodiment 5

FIG. 6 is a system architecture diagram of an automotive electrical system according to Embodiment 4 of the present invention. As shown in FIG. 4 , the first isolation circuit 4 in the system includes at least one fuse, one end of the fuse is connected to the first side of the DC converter 3 , and the other end is connected to the first battery 1 , wherein the structure of the second isolation circuit 5 is The same, including a first diode and a second diode, the anode of the first diode is connected to the first end of the DC converter 3, the cathode of the first diode is connected to the cathode of the second diode, the The anodes of the two diodes are connected to the first battery 1 .

This embodiment simplifies the settings of the first electronic switch and the second electronic switch, and uses a fuse to replace the first electronic switch and the second electronic switch, so that when the circuit fails, the fuse can be used when the line current is too large. The automatic disconnection protects the safety of the entire power grid. After disconnection, the first battery and the second battery can still supply power to the electrical equipment through the first diode and the second diode.

Embodiment 6

FIG. 7 is a system architecture diagram of an automotive electrical system according to Embodiment 5 of the present invention. As shown in FIG. 4 , the first isolation circuit in the system includes a first electronic switch 41 and a second electronic switch 42 connected in series; the first electronic switch 41 and the second electronic switch 42 are connected in opposite directions, and this solution does not include The second isolation circuit.

The specific structure can be shown in FIG. 7 , the source of the MOS tube in the first electronic switch 41 is connected to the source of the second electronic switch 42 and a plurality of fuses, and the other end of the fuse is connected to the electrical appliance; The drain of the MOS tube is connected to the DC converter.

In this embodiment, the first electronic switch 41 and the second electronic switch 42 can be controlled by the DC converter, so that the fluctuating voltage on one side of the first isolation circuit 4 will not affect the other side of the first isolation circuit 4 . In addition, the first power supply 1 or the second power supply 2 can also be controlled to supply power to a plurality of electrical devices.

The present application also provides an embodiment of an automobile. The automobile includes a starter, a generator, and the automobile electrical system provided in the above embodiments of the present application, and the second battery is connected to the starter and the generator.

Specifically, the second battery 2 can be connected to a starter and a generator to start the internal combustion engine, thereby starting the car, and to obtain mechanical energy through the front-end drive system of the internal combustion engine—the drive pulley, which is then converted into direct current and sent to the second battery 2 for processing. store.

The above-mentioned specific embodiments 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 may occur depending on design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. An automotive electrical system, comprising: the automobile electric system also comprises a direct current converter and a first isolation circuit;

the first end of the first isolation circuit is connected with the first battery, and the second end of the first isolation circuit is connected with the first side of the direct current converter; the second battery is connected with the second side of the direct current converter;

the first isolation circuit comprises at least one first isolation device and is used for turning off the corresponding first isolation device when voltage abrupt change of one side of the direct current converter is detected, so that voltage isolation between the first side and the second side of the direct current converter is realized.

2. The automotive electrical system of claim 1, further comprising a second isolation circuit, wherein a first end of the second isolation circuit is connected to the first battery, a second end of the second isolation circuit is connected to the first side of the dc converter, and a third end of the second isolation circuit is connected to a plurality of electrical devices;

the second isolation circuit comprises at least one second isolation device and is used for blocking current on one side of the second isolation circuit from flowing into the other side of the second isolation circuit, and meanwhile, the first battery and the second battery are enabled to supply power to electric equipment through the second isolation device.

3. The automotive electrical system of any of claims 1-2, wherein the first isolation circuit comprises a first electronic switch and a second electronic switch in series; the first electronic switch and the second electronic switch are connected in a reverse direction.

4. The automotive electrical system of claim 3, wherein the first electronic switch and the second electronic switch each comprise a MOS transistor and a third diode, the MOS transistor having a gate connected to the control side of the DC converter, a source connected to the anode of the third diode, and a drain connected to the cathode of the third diode.

5. The automotive electrical system of claim 2, wherein the second isolation circuit comprises a first diode and a second diode;

the positive pole of the first diode is connected with the first end of the direct current converter, the negative pole of the first diode is connected with the negative pole of the second diode, and the positive pole of the second diode is connected with the first battery.

6. The automotive electrical system of claim 5, wherein the cathodes of the first and second diodes are connected to one end of a fuse, and the other end of the fuse is connected to an electrical device.

7. The automotive electrical system of claim 1, wherein the first isolation circuit includes a third electronic switch having one terminal connected to the first terminal of the dc converter and another terminal connected to the first battery.

8. The automotive electrical system of claim 1, wherein the first isolation circuit comprises at least one fuse having one end connected to a first end of the dc converter and another end connected to the first battery.

9. The automotive electrical system of claim 1, wherein the supply voltage of the first battery is less than the supply voltage of the second battery; the first battery is a 12V power supply battery, the second battery is a 24V power supply battery, and the first battery and the second battery are lithium batteries.

10. An automobile comprising a starter, a generator and the automobile electrical system of any one of claims 1-9, wherein the second battery connects the starter and the generator.

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