Vehicle-mounted auxiliary driving device and power supply system therefor

Abstract

This invention discloses a power supply system for an in-vehicle driver assistance device. The power supply system includes: a first power supply branch supplying power to a System-on-a-Chip (SOC) based on a first power source; a second power supply branch supplying power to the SOC based on a second power source; a third power supply branch drawing power from the first power supply branch to supply power to an MCU (Microcontroller Unit), wherein the MCU generates a first control signal to control the first power supply branch to disconnect when the in-vehicle driver assistance device is in a low-power mode; a first voltage monitoring circuit generating a second control signal based on the first power source; and a second voltage monitoring circuit generating a third control signal based on the second power source. The first power supply branch includes first and second switching elements connected in series; and a first control circuit controlling the on / off state of the first power supply branch according to the first and second control signals. The second power supply branch includes third and fourth switching elements connected in series; and a second control circuit controlling the on / off state of the second power supply branch according to the second and third control signals.

Description

Technical Field

[0001] This invention relates to power supply technology, and more particularly to an in-vehicle driver assistance device and a power supply system therefor. Background Technology

[0002] In existing automotive driver assistance system power supply design circuits, two power supplies are typically involved: one from OBD (On-Board Diagnostics) and the other from a supercapacitor. The industry generally uses a supercapacitor-controlled MCU (Microcontroller Unit) paired with a Powerpath control chip (e.g., Analog Devices' LTC4418 system chip) to achieve dual power supply switching and control. However, this approach suffers from high cost and high power consumption. Summary of the Invention

[0003] The purpose of this invention is to provide an in-vehicle driver assistance device and a power supply system for it, which has the advantages of low cost and low power consumption.

[0004] Embodiments of the present invention provide a power supply system for an in-vehicle driver assistance device, the in-vehicle driver assistance device comprising: a system MCU and a platform SOC, including:

[0005] The first power supply branch is used to supply power to the platform SOC according to the first power supply;

[0006] The second power supply branch is used to supply power to the platform SOC according to the rechargeable second power source;

[0007] The third power supply branch is used to draw power from the first power supply branch to supply power to the system MCU. The system MCU is used to generate a first control signal, and when the vehicle-mounted driver assistance device is in a low-power mode, the generated first control signal is used to control the first power supply branch to disconnect.

[0008] A first voltage monitoring circuit is configured to generate a second control signal based on the power supply voltage provided by the first power source; and

[0009] The second voltage monitoring circuit is used to generate a third control signal based on the power supply voltage provided by the second power supply.

[0010] The first power supply branch includes:

[0011] The first and second switching elements connected in series; and

[0012] A first control circuit is used to control the first and second switching elements according to the first and second control signals, so as to control the on and off of the first power supply branch;

[0013] The second power supply branch includes:

[0014] The third and fourth switching elements connected in series; and

[0015] The second control circuit is used to control the third and fourth switching elements according to the second and third control signals, so as to control the on / off state of the second power supply branch.

[0016] The first control circuit includes:

[0017] The fifth and sixth switching elements are respectively connected to the control terminals of the first and second switching elements, and are respectively controlled by the first and second control signals;

[0018] When the first control signal is valid, the first and fifth switching elements are turned on; when the second control signal is valid, the second and sixth switching elements are turned on.

[0019] The first and second switching elements are P-type transistors, and the second and sixth switching elements are N-type transistors.

[0020] The second control circuit includes:

[0021] The seventh, eighth, and ninth switching elements are respectively connected to the control terminals of the third and fourth switching elements, and the ninth switching element is connected to the control terminal of the eighth switching element.

[0022] The control terminal of the seventh switching element is controlled by the third control signal, and when the third control signal is valid, the third and seventh switching elements are turned on.

[0023] The control terminal of the ninth switching element is controlled by the second control signal, and the control terminal of the eighth switching element is controlled by the third control signal and the ninth switching element. When the second control signal is valid, the ninth switching element is turned on, and the fourth and eighth switching elements are turned off. When the third control signal is valid and the second control signal is invalid, the ninth switching element is turned off, and the fourth and eighth switching elements are turned on.

[0024] The third and fourth switching elements are P-type transistors, and the seventh to ninth switching elements are N-type transistors.

[0025] The second control circuit is further configured to: control the second power supply branch to charge the second power supply using the output of the first power supply branch, according to the third and fourth control signals;

[0026] The fourth control signal is generated by the platform SOC. The platform SOC generates a valid fourth control signal when it detects that the voltage of the second power supply is lower than the charging threshold.

[0027] The second control circuit includes:

[0028] The seventh, eighth, and tenth switching elements are respectively connected to the control terminals of the third and fourth switching elements, and the tenth switching element is connected to the control terminal of the third switching element;

[0029] The control terminals of the seventh and eighth switching elements are controlled by the third control signal, and the control terminal of the tenth switching element is controlled by the fourth control signal.

[0030] When the second power supply is being charged, the third control signal is invalid, the fourth control signal is valid, and under the control of the third and fourth control signals, the fourth, seventh and eighth switching elements are disconnected, while the third and tenth switching elements are turned on.

[0031] The third and fourth switching elements are P-type transistors, and the seventh, eighth and tenth switching elements are N-type transistors.

[0032] The second power supply branch further includes an LDO connected to the output terminal of the first power supply branch to form a charging path from the output terminal of the first power supply branch, the LDO, the third switching element to the second power supply.

[0033] The first power supply branch further includes: an OBD connector and a DC-DC step-down circuit, wherein the OBD connector, the DC-DC step-down circuit, the first switching element and the second switching element are connected in series.

[0034] The input terminal of the third power supply branch is connected to the output terminal of the DC-DC step-down circuit so as to use the voltage of the output terminal of the DC-DC step-down circuit to power the system MCU.

[0035] This also includes:

[0036] A power failure detection circuit is connected to the output of the first voltage monitoring circuit, and generates a power failure signal based on the output of the first voltage monitoring circuit, and provides it to the platform SOC.

[0037] The first power source is an OBD device, and the second power source is a supercapacitor.

[0038] This invention provides an in-vehicle driver assistance device, including the power supply system described above.

[0039] Compared to related technologies, the embodiments of this invention employ switching elements (e.g., implemented by MOSFETs) and control circuits (e.g., implemented by MOSFETs) to achieve power switching for the two power supply branches. Therefore, it eliminates the need for a dedicated MCU paired with a Powerpath control chip, saving costs. Furthermore, in low-power mode, the platform SOC is powered off by controlling the disconnection of the switching element in the first power supply branch. This allows for greater flexibility in the power draw position of the system MCU in the first power supply branch, contributing to a reduction in overall system power consumption. Attached Figure Description

[0040] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0041] Figure 1 It is based on a structural diagram of a power supply system used in vehicle-mounted driver assistance devices;

[0042] Figure 2 This is a schematic diagram of the power supply system for an on-board driver assistance device according to the first embodiment of the present invention;

[0043] Figure 3 yes Figure 2 A schematic diagram of an embodiment of the control circuit 16;

[0044] Figure 4 yes Figure 2 A schematic diagram of an embodiment of the control circuit 25;

[0045] Figure 5 This is a schematic diagram of the state switching of the vehicle-mounted driver assistance device according to an embodiment of the present invention. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of the present invention to enable the reader to better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0047] In embodiments of the present invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0048] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0049] Furthermore, the terms "installation," "setting," "equipped with," "opening," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0050] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0051] like Figure 1 The diagram shown is a structural schematic of an embodiment of a power supply system for an in-vehicle driver assistance device. The power supply system includes: an OBD (On-Board Diagnostic) connector 10, a DC-DC (Direct-to-Direct-Voltage) step-down circuit 11, an LDO (Linear Regulator) 12, a system MCU (Microcontroller Unit) 13, a supercapacitor 20, a charging path 21, a discharging path 22, a supercapacitor control MCU 23, and a power path control chip 30.

[0052] The OBD connector 10 and the DC-DC step-down circuit 11 constitute the first power supply branch, and the supercapacitor 20 and the discharge path 22 constitute the second power supply branch. The power path control chip 30 switches between the first power supply branch and the second power supply branch based on the system voltage VSYS provided by the first power supply branch and the capacitor voltage VCAP provided by the second power supply branch, so as to connect VSYS or VCAP with VBAT to serve as the power supply for the vehicle-mounted driver assistance equipment (such as the platform SOC (system chip)).

[0053] In addition, Figure 1 In the process, the supercapacitor control MCU23 controls the charging path 21 and the discharging path 22 of the supercapacitor 20. For example, when the voltage of the supercapacitor 20 is lower than the charging threshold, the charging path 21 is turned on, and when the voltage of the supercapacitor 20 is greater than the discharging threshold, the discharging path 22 is turned on.

[0054] Additionally, the system MCU13 in the vehicle-mounted driver assistance system is powered by the LDO12, which draws power from the output of the OBD connector 10. The system MCU13 can control the system to enter a low-power mode (Hibernate Mode), in which case the DC-DC buck circuit 11 is shut down.

[0055] exist Figure 1 In this structure, the switching of power supply branches is jointly determined by the supercapacitor control MCU23 and the power path control chip 30 (e.g., ADI's LTC4412 / 4418), both of which are relatively expensive, resulting in a high overall cost for the power supply system. Furthermore, in Figure 1 In this structure, due to the logic of the powerpath control chip 30, the system MCU13 needs to cut off the DC-DC buck circuit 11 in low-power mode. Therefore, the system MCU13 cannot draw power from the output of the DC-DC buck circuit 11, resulting in low power efficiency. In addition, even when the system is in standby mode, it is necessary to supply power to the supercapacitor control MCU23, which leads to increased energy consumption.

[0056] Therefore, embodiments of the present invention provide a method such as Figure 2 The power supply system shown is for an onboard driver assistance system, to at least partially solve the problem of... Figure 1 The problems that exist in it.

[0057] like Figure 2 The diagram shown is a structural schematic of an embodiment of a power supply system for an in-vehicle driver assistance device. It includes:

[0058] The first power supply branch mainly includes, as shown in the diagram: OBD connector 10, DC-DC step-down circuit 11, switching elements Q1 and Q2, and control circuit 16. The OBD connector 10, DC-DC step-down circuit 11, and switching elements Q1 and Q2 are connected in series. The control circuit 16, in response to the first and second control signals (represented by A and B in the diagram), controls the switching elements Q1 and Q2 to turn on or off, thereby connecting the system voltage VSYS to VBAT. VBAT is the power supply voltage for the platform system 40 (mainly referring to the platform SOC) in the onboard driver assistance system.

[0059] The second power supply branch mainly includes, as shown in the diagram, a supercapacitor 20, switching elements Q3 and Q4, and a control circuit 25. The supercapacitor 20 and switching elements Q3 and Q4 are connected in series. Under the control of the second to fourth control signals (represented by B, C, and D in the diagram), the control circuit 25 connects the capacitor voltage VCAP to VBAT or charges the supercapacitor 20 by controlling the on / off state of switching elements Q3 and Q4.

[0060] like Figure 2 As shown, the switching of the power supply circuit is completed by the control circuits 16 and 25, as well as the switching elements Q1 to Q4. There is no need to set up a dedicated Powerpath control chip or a supercapacitor MCU, thus saving costs.

[0061] In this embodiment, the first control signal A is generated by the system MCU13. When the system enters / is in a low-power mode, the system MCU13 generates the first control signal A, which turns off Q1 or Q2. Since the first power supply branch can be turned off by turning off Q1 or Q2, this embodiment does not have any particular restrictions on the power source location of the MCU13. The MCU13 can draw power from the output terminal DC_IN of the OBD connector 10, or from the output terminal of the DC-DC buck circuit 11 (as shown in the figure). When the MCU13 draws power from VSYS, the power supply efficiency can be improved. Furthermore, the system MCU13 is powered by an LDO 12.

[0062] The second control signal B is generated by the voltage monitoring circuit 14. The voltage monitoring circuit 14 can be a comparator. When the voltage monitoring circuit 14 detects that the voltage value of VSYS is greater than the first detection threshold voltage, it outputs a valid second control signal B, for example, a high-level second control signal B; otherwise, it outputs a low-level second control signal B.

[0063] Therefore, when the voltage value of VSYS is greater than the first detection threshold voltage, and the system is in a non-standby (low power) mode (e.g., normal operation mode), both the first and second control signals A and B are valid, for example, both are high level. Then the control circuit 16 controls the switching elements Q1 and Q2 to turn on based on the first and second control signals A and B. At this time, VBAT is supplied by VSYS, that is, it is powered by OBD.

[0064] Specifically, in one embodiment, such as Figure 3 As shown, Q1 and Q2 can be implemented using P-type transistors, such as PMOS, while the control circuit 16 can be implemented using switching elements Q5 and Q6, such as N-type transistors, such as NMOS. Figure 3 In the above scenario, when A = B = H (high level), Q5 and Q6 are turned on, causing Q1 and Q2 to turn on as well, and VBAT = VSYS. However, when A = L (low level) and / or B = L, Q5 and / or Q6 are both turned off (disconnected), causing Q1 and / or Q2 to turn off, and VBAT is not provided by VSYS. For example, in low-power mode, A = L, Q5 is off, and Q1 is off; or, when VSYS is less than the first detection threshold voltage, B = L, Q6 is off, and Q2 is off. It should be noted that... Figure 3 This is merely an example and not a limitation on the embodiments of the present invention.

[0065] Continue as Figure 2 As shown, the third control signal C is generated by the voltage monitoring circuit 24. The voltage monitoring circuit 24 can be a comparator that detects the capacitor voltage VCAP of the supercapacitor 20 and generates the third control signal C based on the magnitude of VCAP. For example, the third control signal C is valid when VCAP is greater than the second detection threshold voltage. The control circuit 25 can control Q3 and Q4 to turn on or off based on the second and third control signals B and C, thereby controlling whether the second power supply branch supplies power to VBAT.

[0066] like Figure 4 As shown, the control circuit 25 can be composed of switching elements Q7, Q8, and Q9. In the figure, Q3 and Q4 are examples of P-type transistors, such as PMOS, and Q7 to Q9 are examples of N-type transistors, such as NMOS. When B = H (at this time, powered by VSYS), Q9 is turned on, Q8 is turned off, and Q4 is turned off, thus the second power supply branch is disconnected. When B = L and C = H (VCAP is greater than the second detection threshold voltage), Q7, Q3, Q8, and Q4 are turned on, VBAT = VCAP, meaning powered by the supercapacitor 20.

[0067] Continue as Figure 2 and 4As shown, the control circuit 25 can also be controlled by a fourth control signal D, which is called the charging control signal. This signal is used to control the charging of the supercapacitor 20. For example, when the voltage of the supercapacitor 20 is lower than the charging threshold voltage, VBAT can be used to charge the supercapacitor 20. The charging path is as follows: Figure 2 As shown by the dashed line, the supercapacitor 20 is charged from VBAT via LDO26 and Q3. The fourth control signal D can be generated by the platform SOC, for example, by detecting the voltage of VCAP_DRAIN_ADC (a voltage divider based on VCAP, converted from analog to digital for easier processing by the platform SOC). When the voltage is below the set charging voltage threshold, the output is D=H; when the supercapacitor 20 is detected to be fully charged, the output is D=L, and charging of the supercapacitor 20 stops.

[0068] Specifically, such as Figure 2 and 4 As shown, the fourth control signal D controls the switching element Q10, which can be a P-type transistor such as a PMOS, to control the charging of the supercapacitor. Specifically, when D = H and B = H (if B is not H, there is no charging source, so to charge the supercapacitor 20, B must be H), Q10, Q3, and Q9 are turned on, Q8 is turned off, and Q4 is turned off. Then, VBAT, after being regulated by the LDO, charges the supercapacitor 20 via Q3.

[0069] Continue as Figure 2 As shown, the output of the voltage monitoring circuit 14 is also connected to an inverter 15, which can be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) to invert the control signal B before outputting it. For example, when B is H, B' = L, and vice versa. Here, B' can also be called a power-down detection signal, and correspondingly, the inverter 15 can also be called a power-down detection circuit. When B' is low, SYS is powered normally, and when B' = H, the platform SOC detects that SYS is powered down.

[0070] pass Figures 2 to 4 The power supply circuit of the embodiment of the present invention has been described below, in conjunction with... Figure 5 This invention describes the state switching logic of the vehicle-mounted driver assistance device in an embodiment of the present invention, as well as the corresponding power supply switching logic.

[0071] like Figure 2 and 5 As shown, initially, the system is in SHIP mode, where both the SOC and MCU are off. When the OBD is inserted, VSYS gradually increases until it stabilizes, and correspondingly, control signals A and B become high. At this time, Q1 and Q2 are turned on, VBAT is powered by VSYS, and the system enters normal operating mode, where both the SOC and MCU are in the active state.

[0072] In addition, in normal mode, when the voltage of supercapacitor 20 is lower than the charging threshold, control signal D goes high. Under the control of control signals B and D, supercapacitor 20 is charged via LDO26 and Q3 using VBAT. When supercapacitor 20 is fully charged, control signal D goes low again, stopping charging.

[0073] When the system is in normal operating mode, if an ignition failure signal is detected, it enters sleep mode. In this mode, both the SOC and MCU are in sleep mode, still powered by VSYS. If an ignition signal is detected in sleep mode, the system switches back to normal operating mode, activating the SOC and MCU.

[0074] When the system has been in sleep mode for a predetermined period, it switches to low-power mode. In low-power mode, the MCU goes into sleep mode, and the first control signal A=L outputs to disconnect Q1, interrupting the power supply to the platform SOC to reduce power consumption. In low-power mode, when an ignition signal is detected, the system switches back to normal operating mode.

[0075] It should be noted that when the OBD cable is detected to be out of position (i.e. power failure) in any of the above modes, for example, B=L, the system will switch to power supply from supercapacitor 20 and shut down after a period of time (depending on the charge of supercapacitor 20).

[0076] In addition, an embodiment of the present invention provides an in-vehicle driver assistance device, including the power supply system described above.

[0077] The "subject name" provided by the embodiments of the present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the idea of ​​the present invention. There may be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A power supply system for a vehicle-mounted assistive driving device, the vehicle-mounted assistive driving device comprising: The system MCU and platform SOC are characterized by including: The first power supply branch is used to supply power to the platform SOC according to the first power supply; The second power supply branch is used to supply power to the platform SOC according to the rechargeable second power source; The third power supply branch is used to draw power from the first power supply branch to supply power to the system MCU. The system MCU is used to generate a first control signal, and when the vehicle-mounted driver assistance device is in a low-power mode, the generated first control signal is used to control the first power supply branch to disconnect. A first voltage monitoring circuit is used to generate a second control signal based on the power supply voltage provided by the first power source; and The second voltage monitoring circuit is used to generate a third control signal based on the power supply voltage provided by the second power supply. The first power supply branch includes: The first and second switching elements connected in series; and A first control circuit is used to control the first and second switching elements according to the first and second control signals, so as to control the on and off of the first power supply branch; The second power supply branch includes: The third and fourth switching elements connected in series; and The second control circuit is used to control the third and fourth switching elements according to the second and third control signals, so as to control the on and off of the second power supply branch; The second control circuit includes: The seventh, eighth, and ninth switching elements are respectively connected to the control terminals of the third and fourth switching elements, and the ninth switching element is connected to the control terminal of the eighth switching element. The control terminal of the seventh switching element is controlled by the third control signal, and when the third control signal is valid, the third and seventh switching elements are turned on. The control terminal of the ninth switching element is controlled by the second control signal, and the control terminal of the eighth switching element is controlled by the third control signal and the ninth switching element. When the second control signal is valid, the ninth switching element is turned on, and the fourth and eighth switching elements are turned off. When the third control signal is valid and the second control signal is invalid, the ninth switching element is turned off, and the fourth and eighth switching elements are turned on.

2. The power supply system for a vehicle-mounted auxiliary driving assist device according to claim 1, characterized by, The first control circuit includes: The fifth and sixth switching elements are respectively connected to the control terminals of the first and second switching elements, and are respectively controlled by the first and second control signals; When the first control signal is valid, the first and fifth switching elements are turned on; when the second control signal is valid, the second and sixth switching elements are turned on.

3. The power supply system for a vehicle-mounted auxiliary driving assist device according to claim 2, characterized by, The first and second switching elements are P-type transistors, and the fifth and sixth switching elements are N-type transistors.

4. The power supply system for a vehicle-mounted auxiliary driving assist device according to claim 1, characterized by, The third and fourth switching elements are P-type transistors, and the seventh to ninth switching elements are N-type transistors.

5. The power supply system for a vehicle-mounted auxiliary driving assist device according to claim 1, characterized by, The second control circuit is further configured to: control the second power supply branch to charge the second power supply using the output of the first power supply branch, according to the third and fourth control signals; The fourth control signal is generated by the platform SOC. The platform SOC generates a valid fourth control signal when it detects that the voltage of the second power supply is lower than the charging threshold.

6. The power supply system for an on-board driver assistance device according to claim 5, characterized in that, The second control circuit includes: The seventh, eighth, and tenth switching elements are respectively connected to the control terminals of the third and fourth switching elements, and the tenth switching element is connected to the control terminal of the third switching element; The control terminals of the seventh and eighth switching elements are controlled by the third control signal, and the control terminal of the tenth switching element is controlled by the fourth control signal. When the second power supply is being charged, the third control signal is invalid, the fourth control signal is valid, and under the control of the third and fourth control signals, the fourth, seventh and eighth switching elements are disconnected, while the third and tenth switching elements are turned on.

7. The power supply system for an on-board driver assistance device according to claim 6, characterized in that, The third and fourth switching elements are P-type transistors, and the seventh, eighth and tenth switching elements are N-type transistors.

8. The power supply system for an on-board driver assistance device according to claim 1, characterized in that, The second power supply branch further includes an LDO connected to the output terminal of the first power supply branch to form a charging path from the output terminal of the first power supply branch, the LDO, the third switching element to the second power supply.

9. The power supply system for an on-board driver assistance device according to claim 1, characterized in that, The first power supply branch also includes: an OBD connector and a DC-DC step-down circuit, wherein the OBD connector, the DC-DC step-down circuit, the first switching element, and the second switching element are connected in series. The input terminal of the third power supply branch is connected to the output terminal of the DC-DC step-down circuit so as to use the voltage of the output terminal of the DC-DC step-down circuit to power the system MCU.

10. The power supply system for an on-board driver assistance device according to claim 1, characterized in that, Also includes: A power failure detection circuit is connected to the output of the first voltage monitoring circuit, and generates a power failure signal based on the output of the first voltage monitoring circuit, and provides it to the platform SOC.

11. The power supply system for an on-board driver assistance device according to claim 1, characterized in that, The first power source is an OBD device, and the second power source is a supercapacitor.

12. A vehicle-mounted driver assistance device, characterized in that, Includes the power supply system as described in any one of claims 1 to 11.

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