Power supply control circuit, electronic control unit, vehicle body control system and vehicle

Abstract

The utility model discloses a power supply control circuit, an electronic control unit, a vehicle body control system and a vehicle, the power supply control circuit comprises a first power supply circuit and a state switching circuit; the input end of the first power circuit is connected with a power supply module; the first power supply end of the state switching circuit is connected with the power supply module; the state switching circuit is connected with the external circuit and the first power supply circuit and is used for adjusting the working state of the first power supply circuit according to the first electric signal output by the external circuit. According to the technical scheme, when the state switching circuit controls the first power supply circuit to be switched from the working state to the non-working state, the state switching circuit can enter the low-power-consumption state, and the power supply module only supplies power to the state switching circuit with low power consumption, so that the static power consumption of the power supply module is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supplies, in particular to a power control circuit, an electronic control unit, a vehicle body control system and a vehicle. Background Art

[0002] With the development of vehicles towards multi-functionality and intelligence, more and more electronic components are configured in vehicles. In a vehicle, some electronic devices are powered by constant power, that is, they draw power from the power supply module of the vehicle, and the power supply module is, for example, a storage battery. For electronic devices, their static power consumption becomes a very critical indicator. Because when the vehicle is in the off state, the generator in the vehicle is in the stopped state, and at this time, the power supply module of the vehicle becomes the only power supply for the above-mentioned electronic devices. When the vehicle is in the off state for a long time, the above-mentioned electronic devices will continuously draw power from the power supply module until the power of the power supply module is exhausted, and ultimately the vehicle cannot be started. Therefore, how to reduce the static power consumption of the power supply module has become a technical problem to be solved urgently at present. Summary of the Utility Model

[0003] Embodiments of the utility model provide a power control circuit, an electronic control unit, a vehicle body control system and a vehicle to solve the problem of large static power consumption of the power supply module.

[0004] A power control circuit includes a first power circuit and a state switching circuit;

[0005] The input end of the first power circuit is used to connect to the power supply module;

[0006] The first power supply end of the state switching circuit is connected to the power supply module;

[0007] The state switching circuit is respectively connected to an external circuit and the first power circuit, and is used to adjust the working state of the first power circuit according to a first electrical signal output by the external circuit.

[0008] Further, the second power supply end of the state switching circuit is connected to the output end of the first power circuit.

[0009] Further, the power control circuit further includes a voltage conversion circuit;

[0010] The input end of the voltage conversion circuit is connected to the output end of the first power circuit, and the output end of the voltage conversion circuit is connected to the second power supply end of the state switching circuit.

[0011] Further, the voltage conversion circuit includes a first voltage conversion circuit;

[0012] The input end of the first voltage conversion circuit is connected to the output end of the first power supply circuit, and the output end of the first voltage conversion circuit is connected to the state switching circuit.

[0013] Further, the voltage conversion circuit further includes a second voltage conversion circuit;

[0014] The input end of the second voltage conversion circuit is connected to the output end of the first voltage conversion circuit, and the output end of the second voltage conversion circuit is connected to the state switching circuit.

[0015] Further, the first voltage conversion circuit is a buck circuit, and the second voltage conversion circuit is a boost circuit.

[0016] Further, the state switching circuit includes a CAN chip;

[0017] The first power supply end of the CAN chip is used to connect to the power supply module, and the second power supply end of the CAN chip is used to connect to the output end of the first power supply circuit;

[0018] The differential signal end and the control end of the CAN chip are used to connect to the external circuit.

[0019] An electronic control unit includes an external circuit and the above-mentioned power supply control circuit;

[0020] The external circuit includes a control module, and the control module is connected to the output end of the first power supply circuit and the state switching circuit.

[0021] A body control system includes the above-mentioned electronic control unit.

[0022] A vehicle includes a power supply module and the above-mentioned body control system; the external circuit further includes a CAN bus network;

[0023] The power supply module is connected to the input end of the first power supply circuit and the first power supply end of the CAN chip;

[0024] The control module is respectively connected to the output end of the first power supply circuit and the control end of the CAN chip;

[0025] The CAN bus network is connected to the differential signal end of the CAN chip.

[0026] The above power control circuit, electronic control unit, body control system and vehicle, the power control circuit includes a first power circuit and a state switching circuit; the input end of the first power circuit is used to connect to a power supply module; the first power supply end of the state switching circuit is connected to the power supply module; the state switching circuit is connected to an external circuit and the first power circuit, and is used to adjust the working state of the first power circuit according to the first electrical signal output by the external circuit, so that when the state switching circuit controls the first power circuit to switch from the working state to the non-working state, the state switching circuit can enter the low-power state, and the power supply module only supplies power to the state switching circuit with lower power consumption, thereby reducing the static power consumption of the power supply module. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 is a circuit schematic diagram of a power control circuit in an embodiment of the present invention;

[0029] Figure 2 is another circuit schematic diagram of a power control circuit in an embodiment of the present invention;

[0030] Figure 3 is another circuit schematic diagram of a power control circuit in an embodiment of the present invention;

[0031] Figure 4 is a wake-up signal schematic diagram of a CAN chip in an embodiment of the present invention;

[0032] Figure 5 is a working mode schematic diagram of a CAN chip in an embodiment of the present invention;

[0033] Figure 6 is a schematic diagram of a vehicle in an embodiment of the present invention.

[0034] In the figure: 1. Power supply module; 2. CAN bus network; 3. Electronic control unit; 31. Control module; 32. Power control circuit; 321. First power circuit; 322. State switching circuit; 323. Voltage conversion circuit; 3231. First voltage conversion circuit; 3232. Second voltage conversion circuit; 4. External circuit. Detailed Embodiments

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] It should be understood that the present invention can be implemented in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0037] To fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may also have other implementation manners.

[0038] This embodiment provides a power control circuit 32, as Figure 6 shown, which is applied in a vehicle. Exemplarily, the vehicle includes a plurality of body control systems and a power supply module 1 for supplying power to the plurality of body control systems. The plurality of body control systems are connected through a CAN bus network 2. Each body control system includes an electronic control unit 3. The electronic control unit 3 includes a control module 31 and the power control circuit 32. Exemplarily, the power supply module 1 includes a power battery and / or a storage battery. The control module 31 includes a microcontroller unit (MCU for short). Optionally, the electronic control unit 3 further includes a system on chip (SoC).

[0039] This embodiment provides a power control circuit 32, as Figure 1 shown, which includes a first power circuit 321 and a state switching circuit 322. The input end of the first power circuit 321 is used to connect to the power supply module 1. The first power supply end of the state switching circuit 322 is connected to the power supply module 1. The state switching circuit 322 is connected to an external circuit 4 and the first power circuit 321, and is used to adjust the working state of the first power circuit 321 according to a first electrical signal output by the external circuit 4.

[0040] As an example, the input terminal of the first power supply circuit 321 is used to connect to the power supply module 1, and is configured to convert the power supply voltage output by the power supply module 1 into a power supply voltage adapted to the electrical load. The electrical load includes a control module 31, such as an MCU or an SoC. Exemplarily, the output terminal of the first power supply circuit 321 is used to connect to the MCU, the SoC, and the state switching circuit 322, and is configured to supply power to the MCU, the SoC, and the state switching circuit 322. Exemplarily, the first power supply circuit 321 includes a DC / DC voltage conversion circuit 323. The magnitude of the power supply voltage of the first power supply circuit 321 can be selected according to actual requirements and will not be limited herein.

[0041] As an example, the state switching circuit 322 is connected to the external circuit 4 and the first power supply circuit 321, and is configured to adjust the working state of the first power supply circuit 321 according to the first electrical signal output by the external circuit 4. Exemplarily, the external circuit 4 is configured to output the first electrical signal to the state switching circuit 322. The first electrical signal is used to instruct the state switching circuit 322 to adjust the working state of the first power supply circuit 321. Exemplarily, the working state of the first power supply circuit 321 includes a normal working state and a non-working state.

[0042] Exemplarily, the external circuit 4 includes a control module 31 and a CAN bus network 2. The first electrical signal includes a control message signal sent by the control module 31 and a wake-up signal of the CAN bus network 2.

[0043] Specifically, when the vehicle is in an off state, the control module 31 outputs a control message signal to control the state switching circuit 322 to enter the sleep mode. The state switching circuit 322 adjusts the working state of the first power supply circuit 321 to the non-working state. At this time, the state switching circuit 322 is powered by the power supply module 1. Since the first power supply circuit 321 is in the non-working state and the state switching circuit 322 enters the sleep mode, the static power consumption of the power supply module 1 is reduced when the vehicle is off.

[0044] When the vehicle undergoes a state change, such as unlocking or the door being opened, the CAN bus network 2 outputs a wake-up signal to the state switching circuit 322. At this time, the state switching circuit 322 enters the sleep waiting mode from the sleep mode, adjusts the first power supply circuit 321 to the working state, and maintains it for a preset time. If a control message signal from the control module 31 is received within the preset time, it enters the working mode or the sleep mode according to the control message signal. If a control message signal from the control module 31 is not received within the preset time, it re-enters the sleep mode. Exemplarily, the preset time is 200 milliseconds.

[0045] In this embodiment, the power control circuit 32 includes a first power circuit 321 and a state switching circuit 322. The input end of the first power circuit 321 is used to connect to the power supply module 1. The first power supply end of the state switching circuit 322 is connected to the power supply module 1. The state switching circuit 322 is connected to the external circuit 4 and the first power circuit 321, and is used to adjust the working state of the first power circuit 321 according to the first electrical signal output by the external circuit 4. Thus, when the state switching circuit 322 controls the first power circuit 321 to switch from the working state to the non - working state, the state switching circuit 322 can enter the low - power state, and the power supply module 1 only supplies power to the state switching circuit 322 with lower power consumption, thereby reducing the static power consumption of the power supply module 1.

[0046] In one embodiment, as Figure 3 shown, the second power supply end of the state switching circuit 322 is also connected to the output end of the first power circuit 321.

[0047] In this embodiment, the second power supply end of the state switching circuit 322 is also connected to the output end of the first power circuit 321. When the vehicle state changes from the off state to other states, the first power circuit 321 is in the normal working state, and the state switching circuit 322 enters the working mode from the sleep mode. Therefore, the power supply signal provided by the output end of the first power circuit 321 is required to ensure that the state switching circuit 322 can stably work in the working mode.

[0048] In one embodiment, as Figure 3 shown, the power control circuit 32 further includes a voltage conversion circuit 323. The input end of the voltage conversion circuit 323 is connected to the output end of the first power circuit 321, and the output end of the voltage conversion circuit 323 is connected to the second power supply end of the state switching circuit 322.

[0049] In this embodiment, the input end of the voltage conversion circuit 323 is connected to the output end of the first power circuit 321, and the output end of the voltage conversion circuit 323 is connected to the second power supply end of the state switching circuit 322. The voltage conversion circuit 323 is used to convert the power supply signal output by the output end of the first power circuit 321 into the working voltage required when the state switching circuit 322 enters the working mode, so as to ensure that the state switching circuit 322 can work stably.

[0050] In one embodiment, as Figure 3 shown, the voltage conversion circuit 323 includes a first voltage conversion circuit 3231. The input end of the first voltage conversion circuit 3231 is connected to the output end of the first power circuit 321, and the output end of the first voltage conversion circuit 3231 is connected to the VIO power supply end of the state switching circuit 322.

[0051] As an example, the state switching circuit 322 includes IO terminals for communicating with the control module 31, such as TXD terminal and RXD terminal. The VIO power supply terminal of the state switching circuit 322 is used to receive a first power supply voltage, and this first power supply voltage is used to supply power to the IO terminals of the state switching circuit 322. Therefore, by connecting the input terminal of the first voltage conversion circuit 3231 to the output terminal of the first power supply circuit 321, and connecting the output terminal of the first voltage conversion circuit 3231 to the VIO power supply terminal of the state switching circuit 322, the VIO power supply terminal of the state switching circuit 322 is powered by using the first voltage conversion circuit 3231, that is, the VIO power supply terminal of the state switching circuit 322 is powered by multiplexing the first power supply circuit 321, without the need to add an additional power supply circuit, reducing costs and simplifying the circuit.

[0052] In one embodiment, as Figure 3 shown, the voltage conversion circuit 323 further includes a second voltage conversion circuit 3232; the input terminal of the second voltage conversion circuit 3232 is connected to the output terminal of the first voltage conversion circuit 3231, and the output terminal of the second voltage conversion circuit 3232 is connected to the VCC power supply terminal of the state switching circuit 322.

[0053] As an example, the VIO power supply terminal of the state switching circuit 322 is used to receive a second power supply voltage, and this second power supply voltage is used to supply power to the internal circuit of the state switching circuit 322, such as supplying power to the CAN chip inside the state switching circuit 322.

[0054] It should be noted that since the power supply signal output by the first power supply circuit 321 is unstable and prone to fluctuations, if the power supply signal output by the first power supply circuit 321 is directly used as the working mode operating voltage of the state switching circuit 322, when the power supply signal output by the first power supply circuit 321 fluctuates, it may cause the state switching circuit 322 to fail to work properly. Therefore, by connecting the input terminal of the second voltage conversion circuit 3232 to the output terminal of the first voltage conversion circuit 3231, and connecting the output terminal of the second voltage conversion circuit 3232 to the VCC power supply terminal of the state switching circuit 322, after voltage conversion through the first voltage conversion circuit 3231 and the second voltage conversion circuit 3232 first, it can ensure that the state switching circuit 322 can work more stably when entering the working mode.

[0055] In one embodiment, the first voltage conversion circuit 3231 is a buck circuit, and the second voltage conversion circuit 3232 is a boost circuit.

[0056] As an example, assume that the power supply signal output by the first power supply circuit 321 is 5V. The first voltage conversion circuit 3231 converts this 5V voltage into 3.3V voltage to supply power to the VIO power supply terminal of the control module 31 and the state switching circuit 322. The second voltage conversion circuit 3232 then converts the 3.3V voltage into 5V voltage to supply power to the VCC power supply terminal of the state switching circuit 322, so as to ensure that a stable 5V voltage is provided at the VCC power supply terminal of the state switching circuit 322 and prevent voltage fluctuations.

[0057] In one embodiment, the external circuit 4 includes a CAN bus network 2 and a control module 31; the state switching circuit 322 includes a CAN chip; the first power supply terminal of the CAN chip is used to connect to the power supply module 1, and the second power supply terminal of the CAN chip is used to connect to the output terminal of the first power supply circuit 321; the differential signal terminal and the control terminal of the CAN chip are used to connect to the external circuit 4. Exemplarily, the differential signal terminal of the CAN chip is used to connect to the CAN bus network 2; the control terminal of the CAN chip is used to connect to the control module 31.

[0058] As an example, the first power supply terminal VBAT of the CAN chip is used to connect to the power supply module 1, and the second power supply terminal of the CAN chip is used to connect to the output terminal of the first power supply circuit 321. Exemplarily, the second power supply terminal includes a VIO power supply terminal and a VCC power supply terminal. The VIO power supply terminal is connected to the output terminal of the first power supply circuit 321 through the first voltage conversion circuit 3231, and the VCC power supply terminal is connected to the output terminal of the first power supply circuit 321 through the first voltage conversion circuit 3231 and the second voltage conversion circuit 3232. For specific details, please refer to the above embodiments and will not be elaborated here.

[0059] As an example, the differential signal terminal of the CAN chip is used to connect to the CAN bus network 2. Exemplarily, the differential signal terminal includes a CANH terminal and a CANL terminal, which are used to connect to the wake-up signals output by other CAN nodes in the vehicle. The RXD terminal of the CAN chip is connected to the control module 31, and the INH terminal of the CAN chip is connected to the first power supply circuit 321. Figure 4 is a schematic diagram of the wake-up signal of the CAN chip, where t wake(dom) is the minimum detection time for the dominant state, t wake(rec) is the minimum detection time for the recessive state, t wake(timeout) is the timeout time for the wake-up process. When the time t corresponding to the differential signal received at the differential signal terminal satisfies the t wake(dom) corresponding to the dominant state, the t wake(timeout) corresponding to the recessive state, and the t wake(timeout) corresponding to the wake-up process, this differential signal is confirmed as a wake-up signal. For example Figure 4In the remote wake-up frame (WUP), the CAN chip switches from the sleep mode to the working mode. The RXD terminal of the CAN chip outputs a low level, and the INH terminal of the CAN chip outputs a high level to enable the first power supply circuit 321. For example, the INH terminal of the CAN chip is connected to the first power supply circuit 321 through CAN0_INH.

[0060] As an example, the control terminals of the CAN chip include an EN terminal and an STBN terminal, and the EN terminal and the STBN terminal are connected to the control module 31. As Figure 5 shown, it is a schematic diagram of the working mode of the CAN chip. The working modes of the CAN chip include a sleep mode, a sleep waiting mode, a normal working mode, a mute mode, and a standby mode. It can be understood that the wake-up flag in the figure is the above-mentioned wake-up signal. The control module 31 switches the working mode of the CAN chip by controlling the levels of the EN terminal and the STBN terminal. For the specific switching process, please refer to Figure 5 shown, the trigger conditions for the CAN chip to be in the sleep mode include that the wake-up signal disappears and the time t after entering the sleep waiting mode is greater than the preset time t in the above-mentioned embodiment gotosleep . The trigger conditions for the CAN chip to be in the standby mode include that a wake-up signal appears and the STBN terminal is at a low level, or the EN terminal is at a low level and the STBN is at a low level. The trigger conditions for the CAN chip to be in the mute mode include that the EN terminal is at a low level and the STBN is at a high level. The trigger conditions for the CAN chip to be in the normal working mode include that the EN terminal is at a high level and the STBN is at a high level. The trigger conditions for the CAN chip to be in the sleep waiting mode include that the EN terminal is at a high level and the STBN is at a low level, or the wake-up signal disappears and the EN terminal is at a high level and the STBN is at a low level.

[0061] As an example, the CAN chip further includes a WAKE terminal. The WAKE terminal, the EN terminal, and the STBN terminal are commonly connected to the VIO power supply terminal of the CAN chip, so that when the CAN chip is started for the first time, the CAN chip is started by the electrical signal received through the VIO power supply terminal, ensuring that the CAN chip can be started normally.

[0062] This embodiment provides an electronic control unit 3, including an external circuit 4 and the above-mentioned power supply control circuit 32; the external circuit 4 includes a control module 31; the control module 31 is connected to the output terminal of the first power supply circuit 321 and the state switching circuit 322.

[0063] This embodiment provides a vehicle body control system, including the above-mentioned electronic control unit 3.

[0064] This embodiment provides a vehicle, as Figure 6As shown in the figure, it includes a power supply module 1 and the above-mentioned vehicle body control system; the external circuit 4 further includes a CAN bus network 2. The power supply module 1 is connected to the input end of the first power supply circuit 321 and the first power supply end of the CAN chip; the control module 32 is respectively connected to the output end of the first power supply circuit 321 and the control end of the CAN chip; the CAN bus network 2 is connected to the differential signal end of the CAN chip.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A power control circuit, characterized in that, It includes a first power supply circuit and a state switching circuit; The input end of the first power supply circuit is used to connect to a power supply module; The first power supply end of the state switching circuit is connected to the power supply module; The state switching circuit is respectively connected to an external circuit and the first power supply circuit, and is used to adjust the working state of the first power supply circuit according to a first electrical signal output by the external circuit.

2. The power control circuit according to claim 1, wherein The second power supply end of the state switching circuit is connected to the output end of the first power supply circuit.

3. The power control circuit according to claim 1, characterized in that It further includes a voltage conversion circuit; The input end of the voltage conversion circuit is connected to the output end of the first power supply circuit, and the output end of the voltage conversion circuit is connected to the second power supply end of the state switching circuit.

4. The power control circuit according to claim 3, wherein The voltage conversion circuit includes a first voltage conversion circuit; The input end of the first voltage conversion circuit is connected to the output end of the first power supply circuit, and the output end of the first voltage conversion circuit is connected to the state switching circuit.

5. The power control circuit according to claim 4, wherein The voltage conversion circuit further includes a second voltage conversion circuit; The input end of the second voltage conversion circuit is connected to the output end of the first voltage conversion circuit, and the output end of the second voltage conversion circuit is connected to the state switching circuit.

6. The power control circuit according to claim 5, wherein The first voltage conversion circuit is a buck circuit, and the second voltage conversion circuit is a boost circuit.

7. The power control circuit according to claim 1, characterized in that The state switching circuit includes a CAN chip; The first power supply end of the CAN chip is used to connect to the power supply module, and the second power supply end of the CAN chip is used to connect to the output end of the first power supply circuit; The differential signal end and the control end of the CAN chip are used to connect to the external circuit.

8. An electronic control unit, characterized in that, It includes an external circuit and the power supply control circuit according to any one of claims 1 to 7; The external circuit includes a control module, and the control module is connected to the output end of the first power supply circuit and the state switching circuit.

9. A vehicle body control system, characterized in that, It includes the electronic control unit according to claim 8.

10. A vehicle, characterized in that, It includes a power supply module and the vehicle body control system according to claim 9; The external circuit further includes a CAN bus network; The power supply module is connected to the input end of the first power supply circuit and the first power supply end of the CAN chip; The control module is respectively connected to the output end of the first power supply circuit and the control end of the CAN chip; The CAN bus network is connected to the differential signal end of the CAN chip.

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