Power supply circuit and vehicle

Abstract

The utility model relates to a power supply circuit and a vehicle. The power supply circuit comprises a high-voltage battery, a DC / DC circuit and a storage battery. The output end of the high-voltage battery is connected with the input end of the DC / DC circuit, and the first output end of the DC / DC circuit is connected with an external load through the storage battery; and the second output end of the DC / DC circuit is connected with an external load. According to the utility model, the DC / DC circuit with one input and two outputs is arranged to convert the high voltage of the high-voltage battery into two low voltages, one low voltage supplies power to the load through the storage battery, and the other low voltage supplies power to the load directly, so that the normal power supply of the load when the high-voltage battery fails is ensured through the arranged storage battery; and double-power-supply power supply can be realized only through one storage battery, so that the power supply circuit realizes double-power-supply power supply with high function safety level and low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of power management, in particular to a power supply circuit and a vehicle. Background Art

[0002] With the widespread use of electronic devices, power management technology has become increasingly important. Among various power management solutions, the use of batteries has dominated. However, traditional power architectures usually use a single power input, which makes the system's functional safety level low and the cost high. Therefore, a new power architecture is needed to improve the above problems. Utility Model Content

[0003] One of the purposes of the present invention is to provide a power supply circuit to solve the problem that the power supply architecture in the prior art adopts a single power input, resulting in a low functional safety level of the system and a high cost; the second purpose is to provide a vehicle.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A power supply circuit comprises: a high-voltage battery, a DC / DC circuit and a storage battery; the output end of the high-voltage battery is connected to the input end of the DC / DC circuit, the first output end of the DC / DC circuit is connected to an external load through the storage battery; the second output end of the DC / DC circuit is connected to the external load.

[0006] According to the above technical means, by setting up a DC / DC circuit with one input and two outputs, the high voltage of the high-voltage battery is converted into two low voltages, one of which powers the load through the battery, and the other directly powers the load. The normal power supply of the load when the high-voltage battery fails is guaranteed by the set battery, and dual power supply can be achieved by only one battery. Therefore, the power supply circuit realizes dual power supply with high functional safety level and low cost.

[0007] In an optional implementation, the power supply circuit further includes: a redundant circuit, one end of the redundant circuit is connected between the battery and the external load, and the other end of the redundant circuit is connected between the second output end of the DC / DC circuit and the external load.

[0008] In an optional embodiment, the redundant circuit includes a first diode and a second diode, the anode of the first diode and the cathode of the second diode are connected between the battery and the external load, and the cathode of the first diode and the anode of the second diode are connected between the second output terminal of the DC / DC circuit and the external load.

[0009] According to the above technical means, through the setting of the redundant circuit, when any output of the DC / DC circuit fails, the other output can also realize dual power supply through the redundant circuit.

[0010] In an optional embodiment, the power supply circuit also includes: a redundant switching circuit, one end of the redundant switching circuit is connected between the battery and the external load, and the other end of the redundant switching circuit is connected between the second output end of the DC / DC circuit and the external load.

[0011] In an optional embodiment, the redundant switching circuit includes a first diode, a first switch, a second diode and a second switch; the anode of the first diode and the cathode of the second diode are connected between the battery and the external load, the cathode of the first diode is connected to one end of the first switch, the anode of the second diode is connected to the other end of the second switch, and the other end of the first switch and the other end of the second switch are connected between the second output end of the DC / DC circuit and the external load.

[0012] According to the above technical means, through the redundant switching circuit, not only can the function of dual power supply be realized through the redundant switching circuit when any output of the DC / DC circuit fails, but also the function of automatic or means switching of power supply between the first output end and the second output end of the DC / DC circuit can be realized.

[0013] In an optional implementation, the power supply circuit further includes: a first fuse and a second fuse, the first fuse is connected between the battery and the external load, and the second fuse is connected between the second output terminal of the DC / DC circuit and the external load.

[0014] In an optional implementation, the DC / DC circuit includes a ground terminal, and the battery includes a ground terminal.

[0015] According to the above technical means, the power supply circuit is protected by providing the first fuse and the second fuse in the power supply circuit, and providing the ground terminal in the DC / DC circuit and the battery.

[0016] A vehicle comprises an in-vehicle load device and a power supply circuit, wherein the power supply circuit is used to supply power to the in-vehicle load device.

[0017] According to the above technical means, by adopting the power supply circuit of the above embodiment in the vehicle, the problems of increasing the weight of the whole vehicle, occupying the space of the whole vehicle and high cost due to the use of dual batteries are avoided. At the same time, a DC / DC circuit with one input and two outputs is set in the power supply circuit, thereby realizing dual power supply with a high functional safety level.

[0018] In an optional embodiment, the in-vehicle load device includes a chassis domain controller, the chassis domain controller includes a redundantly arranged first controller and a second controller, the first output end of the DC / DC circuit is connected to the first controller via a battery, and the second output end of the DC / DC circuit is connected to the second controller.

[0019] According to the above technical means, a redundant controller is set in the chassis domain control, namely, a first controller and a second controller, and the first controller and the second controller can communicate with each other. When any controller fails, the other controller continues to work, thereby not affecting the normal control of the vehicle. In this embodiment, the dual power supplies provided by the power supply circuit are used to supply power to the dual controllers respectively, ensuring safe and reliable power supply.

[0020] In an optional embodiment, the in-vehicle load device also includes a first power management circuit and a second power management circuit, the first power management circuit is connected between the battery and the first controller, and the second power management circuit is connected between the second output end of the DC / DC circuit and the second controller.

[0021] According to the above technical means, by providing a first power management circuit and a second power management circuit, power supply management of the two controllers is achieved, thereby ensuring the reliability of the power supply process.

[0022] Beneficial effects of the utility model:

[0023] (1) The utility model converts the high voltage of the high voltage battery into two low voltages by setting a DC / DC circuit with one input and two outputs, one of which is used to supply power to the load through the battery, and the other is used to supply power to the load directly. The battery is used to ensure the normal power supply of the load when the high voltage battery fails, and dual power supply can be achieved through only one battery, so that the power supply circuit achieves dual power supply with high functional safety level and low cost. By setting a redundant circuit, when any output of the DC / DC circuit fails, the other output can also achieve dual power supply through the redundant circuit. By setting the redundant switching circuit, not only can the function of dual power supply be achieved through the redundant switching circuit when any output of the DC / DC circuit fails, but also the function of automatically or manually switching power supply between the first output terminal and the second output terminal of the DC / DC circuit can be achieved. By setting the first and second fuses in the power supply circuit, and setting the ground terminal in the DC / DC circuit and the battery, the power supply circuit is protected.

[0024] The utility model adopts the power supply circuit of the above-mentioned embodiment in the vehicle to avoid the problems of increasing the weight of the whole vehicle, occupying the space of the whole vehicle, and high cost by using dual batteries. At the same time, a DC / DC circuit with one input and two outputs is set in the power supply circuit to achieve dual power supply with a high functional safety level. Redundant controllers are set in the chassis domain control, namely the first controller and the second controller. The first controller and the second controller can communicate with each other. When any controller fails, the other controller continues to work, thereby not affecting the normal control of the vehicle. In this embodiment, the dual power supplies provided by the power supply circuit are used to supply power to the dual controllers respectively, ensuring safe and reliable power supply. By setting the first power management circuit and the second power management circuit, power supply management of the two controllers is achieved, ensuring the reliability of the power supply process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of a dual power supply circuit in the prior art;

[0027] Figure 2 It is a structural schematic diagram of a dual power supply circuit in another prior art;

[0028] Figure 3 This is a schematic diagram of the structure of the power supply circuit in the embodiment of the utility model;

[0029] Figure 4 This is a schematic diagram of the structure of another power supply circuit in an embodiment of the utility model;

[0030] Figure 5 It is a structural schematic diagram of another power supply circuit in an embodiment of the utility model;

[0031] Figure 6 This is a structural block diagram of a vehicle in an embodiment of the utility model;

[0032] Figure 7 It is a schematic diagram of the structure of a vehicle in an embodiment of the utility model. DETAILED DESCRIPTION

[0033] As mentioned in the background technology, the traditional power supply architecture usually adopts a single power input, which makes the system's functional safety level lower and the cost higher. However, the dual power supply solution in the related technology also has certain disadvantages. Figure 1 In the related technology shown, the high voltage electricity output by the battery pack (PACK) is converted into low voltage electricity V through DC / DC to charge the battery. The battery outputs two-way power supply V1 and V2 to power the load. When this power supply method is used, for loads with a higher functional safety level, there is a high single-point failure rate and it cannot meet the requirements of ASIL D (Automotive Safety Integration Level D). There are also problems such as Figure 2 In the related technology shown, the high voltage electricity output by the battery PACK is converted into low voltage electricity V through DC / DC to charge two batteries. The two batteries supply power to the loads respectively. That is, this solution provides power to the loads by setting up two batteries. When this power supply mode is adopted, two batteries need to be set up, which is costly for automotive-grade batteries, and arranging dual batteries in the vehicle increases the weight of the vehicle and occupies the space of the vehicle.

[0034] In view of this, the present embodiment provides a power supply circuit, which converts the high voltage of the high voltage battery into two low voltages through a DC / DC circuit with one input and two outputs, thereby achieving a dual power supply with a high functional safety level and low cost.

[0035] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] This embodiment provides a power supply circuit, such as Figure 3 As shown, the power supply circuit includes: a high-voltage battery 10, a DC / DC circuit 20 and a storage battery 30; the output end of the high-voltage battery 10 is connected to the input end of the DC / DC circuit 20, and the first output end of the DC / DC circuit 20 is connected to the external load 40 through the storage battery 30; the second output end of the DC / DC circuit 20 is connected to the external load 40. Among them, the high-voltage battery 10 can adopt a battery pack, and the DC / DC circuit 20 can adopt a DC / DC module with one input and two outputs, that is, the DC / DC circuit can convert the high-voltage electricity input by the high-voltage battery into two low-voltage electricity outputs to power the load, and through the design of the structure in the DC / DC circuit, the DC / DC circuit can output two different voltages. The voltage values ​​output by the first output end and the second output end of the DC / DC circuit can be determined according to actual needs. It should be noted that the DC / DC circuit can adopt the DC / DC circuit chip in the relevant technology, and this embodiment does not specifically limit the structure of the DC / DC circuit.

[0040] The power supply circuit provided in this embodiment converts the high voltage of the high voltage battery into two low voltages by setting up a DC / DC circuit with one input and two outputs, one of which supplies power to the load through the battery, and the other directly supplies power to the load. The provided battery ensures the normal power supply of the load when the high voltage battery fails, and dual power supply can be achieved by only using one battery. Therefore, the power supply circuit achieves dual power supply with high functional safety level and low cost.

[0041] In an optional embodiment, the power supply circuit further includes: a redundant circuit, one end of the redundant circuit is connected between the battery and the external load, and the other end of the redundant circuit is connected between the second output end of the DC / DC circuit and the external load. By setting the redundant circuit, when any output of the DC / DC circuit fails, the other output can also realize dual power supply through the redundant circuit.

[0042] Among them, Figure 4 As shown, the redundant circuit includes a first diode D1 and a second diode D2, the anode of the first diode D1 and the cathode of the second diode D2 are connected between the battery 30 and the external load 40, and the cathode of the first diode D1 and the anode of the second diode D2 are connected between the second output terminal of the DC / DC circuit 20 and the external load 40. Specifically, when the high-voltage battery is not powered on or the second output terminal of the DC / DC circuit fails, the second output terminal of the DC / DC circuit has no voltage output. At this time, the first output terminal of the DC / DC circuit can not only directly power the load, but also provide a second voltage signal to power the load through the first diode D1; at the same time, when the first output terminal of the DC / DC circuit fails, the second output terminal of the DC / DC circuit can not only directly power the load, but also provide a second voltage signal to power the load through the second diode D2. In this way, dual power supply is achieved in the event of a fault, the safety and reliability of the power supply circuit are improved, and the functional safety level is improved.

[0043] In an optional embodiment, the power supply circuit further includes: a redundant switching circuit, one end of which is connected between the battery and the external load, and the other end of which is connected between the second output end of the DC / DC circuit and the external load. Specifically, through the redundant switching circuit, when any output of the DC / DC circuit fails, the other output can also realize the function of dual power supply through the redundant switching circuit, and at the same time, the function of automatically or by means switching power supply between the first output end and the second output end of the DC / DC circuit can be realized.

[0044] Among them, Figure 5As shown, the redundant switching circuit includes a first diode D1, a first switch S1, a second diode D2, and a second switch S2; the anode of the first diode D1 and the cathode of the second diode D2 are connected between the storage battery 30 and the external load 40, the cathode of the first diode D1 is connected to one end of the first switch S1, the anode of the second diode D2 is connected to the other end of the second switch S2, and the other end of the first switch S1 and the other end of the second switch S2 are connected between the second output end of the DC / DC circuit 20 and the external load 40. Specifically, the functions of the first diode D1 and the second diode D2 in the redundant switching circuit are the same as the functions of the first diode D1 and the second diode D2 in the redundant circuit. On this basis, the redundant switching circuit also includes a first switch S1 and a second switch S2, and the first switch S1 and the second switch S2 can be turned on or off according to actual needs. For example, when the second output end of the DC / DC circuit fails and the first output end of the DC / DC circuit needs to supply power to the load through the first diode D1, the first switch S1 can be turned on. If the first output end of the DC / DC circuit is not needed to supply power to the load through the first diode D1 at this time, the first switch S1 can be turned off. The working mode of the second switch S2 is similar to that of the first switch S1. In practical applications, the first switch S1 and the second switch S2 can use mechanical switches, switch tubes, relays and other components to achieve their functions. Therefore, by setting the first switch S1 and the second switch S2 in the redundant switching circuit, the function of automatically or manually switching the power supply is achieved, further ensuring the reliability of the power supply.

[0045] In an optional embodiment, if Figure 4 or Figure 5 As shown, the power supply circuit also includes: two fuses 60, wherein the first fuse is connected between the storage battery 30 and the external load 40, and the second fuse is connected between the second output terminal of the DC / DC circuit 20 and the external load 40. The DC / DC circuit includes a ground terminal, and the storage battery includes a ground terminal. Specifically, the first fuse and the second fuse can be fuses. By arranging the first fuse and the second fuse in the power supply circuit, and arranging the ground terminal in the DC / DC circuit and the storage battery, the power supply circuit is protected.

[0046] This embodiment also provides a vehicle, such as Figure 6 As shown, it includes an in-vehicle load device 200 and the power supply circuit 100 of the above embodiment, and the power supply circuit 100 is used to supply power to the in-vehicle load device 200 .

[0047] In this embodiment, by adopting the power supply circuit of the above embodiment in the vehicle, the problems of increasing the weight of the whole vehicle, occupying the space of the whole vehicle and high cost due to the use of dual batteries are avoided. At the same time, a DC / DC circuit with one input and two outputs is provided in the power supply circuit, thereby realizing dual power supply with a high functional safety level.

[0048] In an optional embodiment, the in-vehicle load device includes a chassis domain controller, and the chassis domain controller includes a redundantly set first controller and a second controller, the first output end of the DC / DC circuit is connected to the first controller through a battery, and the second output end of the DC / DC circuit is connected to the second controller. Among them, the chassis domain controller is mainly responsible for the specific vehicle driving control, and it is necessary to uniformly control the systems including the power steering system, the body stability system, the electric brake booster, the airbag control system, etc. Similar to the power domain, most of the control systems involved in the chassis domain have high safety level requirements. Therefore, in this embodiment, redundant controllers, namely the first controller and the second controller, are set in the chassis domain control. The first controller and the second controller can communicate with each other. When any controller fails, the other controller continues to work, so as not to affect the normal control of the vehicle. In this embodiment, the dual power supplies provided by the power supply circuit are respectively powered by the dual controllers to ensure safe and reliable power supply. Among them, the first controller and the second controller can use MCU (Microcontroller Unit, microcontroller), or a computing platform, etc. to realize their control functions.

[0049] In an optional implementation, the in-vehicle load device further includes a first power management circuit and a second power management circuit, wherein the first power management circuit is connected between the battery and the first controller, and the second power management circuit is connected between the second output terminal of the DC / DC circuit and the second controller. The first power management circuit and the second power management circuit can use PMIC (Power Management IC, power management integrated circuit) to implement their power management functions. Specifically, the first power management circuit is used for power supply management of the first controller, and the second power management circuit is used for power supply management of the second controller.

[0050] In an optional embodiment, as Figure 7 As shown, the vehicle includes a high-voltage battery, a DC / DC circuit with one input and two outputs, a 12V battery, a fuse, a redundant circuit (or a redundant switching circuit), a first power management circuit (PMIC1), a second power management circuit (PMIC2), a first controller (MCU1) and a second controller (MCU2). The connection relationship between the various structures can be found in the above-mentioned implementation manner and will not be repeated here. The high-voltage battery provides a power source; the DC / DC circuit converts the high-voltage electricity output by the high-voltage battery into two low-voltage electricity; the 12V battery ensures the normal power supply of the vehicle controller; the fuse implements overcurrent circuit protection.

[0051] Specifically, DC / DC converts the high voltage electricity output by the high voltage battery into two low voltage electricity V1 and V2. The two low voltage electricity can be the same or different in size. When the two low voltage electricity are the same in size, V1=V2=Vbat (Vbat is the vehicle battery voltage), and the voltages V1 and V2 are independent of each other during the power supply process, and back up each other, which improves the safety, reliability and functional safety level of the power supply system. Among them, the mutual backup of V1 and V2 is completed by the first diode D1 and the second diode D2. When the high voltage is not powered on or the V2 power supply fails, V2 has no output, and while V1 completes the power supply, the power supply capacity of V2 can be completed through the first diode D1. When the V1 power supply fails during driving, V2 can complete the power supply capacity of V1 through the second diode D2, realizing mutual backup of power supplies, thereby improving the safety and reliability of the power supply system and improving the functional safety level.

[0052] When the two low voltages are different in magnitude, V1 = Vbat, V1>V2>V MIN (V MIN is the minimum voltage at which the controller can work normally), V1 is used as the main power supply to continuously supply power to two low-voltage power supplies. At this time, the first switch is turned on and the second switch is turned off. When V1 fails, the first switch is turned off and the second switch is turned on. While the V2 power supply supplies power to the second controller, the second diode D2 and the second switch also supply power to the first controller. This architecture also simplifies complexity and reduces manufacturing and maintenance costs.

[0053] Although the exemplary embodiments and their advantages have been described in detail, those skilled in the art may make various changes, substitutions and modifications to these embodiments without departing from the spirit of the utility model and the scope of protection defined by the appended claims, and such modifications and variations all fall within the scope defined by the appended claims. For other examples, those of ordinary skill in the art should readily understand that the order of the process steps may be changed while maintaining the scope of protection of the utility model.

[0054] In addition, the scope of application of the present invention is not limited to the processes, mechanisms, manufactures, material compositions, means, methods and steps of the specific embodiments described in the specification. From the disclosure of the present invention, it will be easily understood by those skilled in the art that the processes, mechanisms, manufactures, material compositions, means, methods or steps that currently exist or will be developed in the future, which perform substantially the same functions as the corresponding embodiments described in the present invention or obtain substantially the same results, can be applied according to the present invention. Therefore, the claims attached to the present invention are intended to include these processes, mechanisms, manufactures, material compositions, means, methods or steps within their scope of protection.

Claims

1. A power supply circuit, characterized in that: The power supply circuit includes: a high voltage battery, a DC / DC circuit and a storage battery; The output end of the high-voltage battery is connected to the input end of the DC / DC circuit, and the first output end of the DC / DC circuit is connected to an external load through the battery; The second output terminal of the DC / DC circuit is connected to an external load.

2. The power supply circuit according to claim 1, characterized in that: The power supply circuit further includes: a redundant circuit, one end of which is connected between the battery and the external load, and the other end of which is connected between the second output end of the DC / DC circuit and the external load.

3. The power supply circuit according to claim 2, characterized in that: The redundant circuit includes a first diode and a second diode, wherein an anode of the first diode and a cathode of the second diode are connected between the battery and an external load, and a cathode of the first diode and an anode of the second diode are connected between a second output terminal of the DC / DC circuit and an external load.

4. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes: a redundant switching circuit, one end of which is connected between the battery and the external load, and the other end of which is connected between the second output end of the DC / DC circuit and the external load.

5. The power supply circuit according to claim 4, characterized in that: The redundant switching circuit includes a first diode, a first switch, a second diode and a second switch; The anode of the first diode and the cathode of the second diode are connected between the battery and the external load, the cathode of the first diode is connected to one end of the first switch, the anode of the second diode is connected to the other end of the second switch, and the other end of the first switch and the other end of the second switch are connected between the second output end of the DC / DC circuit and the external load.

6. The power supply circuit according to claim 1, characterized in that: The power supply circuit further includes: a first fuse and a second fuse, wherein the first fuse is connected between the storage battery and the external load, and the second fuse is connected between the second output terminal of the DC / DC circuit and the external load.

7. The power supply circuit according to claim 1, characterized in that: The DC / DC circuit includes a ground terminal, and the battery includes a ground terminal.

8. A vehicle, characterized in that: The vehicle comprises an in-vehicle load device and a power supply circuit according to any one of claims 1 to 7, wherein the power supply circuit is used to supply power to the in-vehicle load device.

9. The vehicle according to claim 8, characterized in that The in-vehicle load device includes a chassis domain controller, which includes a first controller and a second controller that are redundantly arranged. The first output end of the DC / DC circuit is connected to the first controller through the battery, and the second output end of the DC / DC circuit is connected to the second controller.

10. The vehicle according to claim 9, characterized in that The in-vehicle load device also includes a first power management circuit and a second power management circuit, the first power management circuit is connected between the battery and the first controller, and the second power management circuit is connected between the second output end of the DC / DC circuit and the second controller.

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