Power supply circuit and control method of vehicle domain controller

Abstract

This application discloses a power supply circuit and control method for an in-vehicle domain controller, relating to the field of vehicle technology. The power supply circuit for the in-vehicle domain controller includes: a first voltage comparator, a second voltage comparator, and a switch control subcircuit. The input terminal of the first voltage comparator is connected to a first power supply, and the output terminal of the first voltage comparator is connected to the switch control subcircuit. The input terminal of the second voltage comparator is connected to a second power supply, and the output terminal of the second voltage comparator is connected to the switch control subcircuit. The switch control subcircuit is also connected to the first power supply, the second power supply, and multiple in-vehicle domain controllers. The first voltage comparator compares a first voltage provided by the first power supply with a voltage threshold, and the second voltage comparator compares a second voltage provided by the second power supply with the voltage threshold, thereby controlling the on / off state of the switches in the switch control subcircuit to supply power to the multiple in-vehicle domain controllers. This reduces the complexity of the power management system and thermal management, and lowers costs.

Description

Technical Field

[0001] This application belongs to the field of vehicle technology, and in particular relates to a power supply circuit and control method for an on-board domain controller. Background Technology

[0002] As intelligent vehicles gradually shift from a distributed to a centralized model, multiple Electronic Control Units (ECUs) are converging towards Domain Controller Units (DCUs), placing greater demands on the power supply management of DCUs.

[0003] In related technologies, each DCU is powered by an independent power supply system. However, using an independent power supply system to power the DCU requires separate power management and thermal management for each DCU, resulting in a complex and costly management system. Summary of the Invention

[0004] This application provides a power supply circuit and control method for an on-board domain controller, which can solve the problems of complex and costly management systems.

[0005] In a first aspect, embodiments of this application provide a power supply circuit for an on-board domain controller, comprising: a first voltage comparator, a second voltage comparator, and a switch control sub-circuit, wherein...

[0006] The input terminal of the first voltage comparator is connected to the first power supply, and the output terminal of the first voltage comparator is connected to the switch control sub-circuit.

[0007] The input terminal of the second voltage comparator is connected to the second power supply, and the output terminal of the second voltage comparator is connected to the switch control sub-circuit.

[0008] The switch control sub-circuit is also connected to the first power supply, the second power supply, and multiple vehicle domain controllers;

[0009] A first voltage comparator compares the first voltage provided by the first power supply with the voltage threshold, and a second voltage comparator compares the second voltage provided by the second power supply with the voltage threshold, so as to control the on / off state of the switches in the switch control sub-circuit to supply power to multiple vehicle domain controllers.

[0010] Secondly, embodiments of this application provide a control method applied to an on-board domain controller power supply circuit including a first switch, a second switch, a third switch, a fourth switch, a first ideal diode controller, and a second ideal diode controller, as provided in embodiments of this application. The control method includes:

[0011] When the first voltage provided by the first power supply is greater than the voltage threshold but the second voltage provided by the second power supply is less than the voltage threshold, the first and third switches of the control switch control subcircuit are closed, the second and fourth switches of the switch control subcircuit are open, and the first power supply provides power to all vehicle domain controllers connected to the switch control subcircuit.

[0012] When the second voltage is greater than the voltage threshold but the first voltage is less than the voltage threshold, the second and fourth switches are closed, the first and third switches are opened, and the second power supply provides power to all vehicle domain controllers connected to the switch control sub-circuit.

[0013] When both the first voltage and the second voltage are less than the voltage threshold but the first voltage is greater than the second voltage, the first switch, the second switch, the third switch and the fourth switch are all closed, the second ideal diode controller cuts off the second power supply, and the first power supply supplies power to all vehicle domain controllers connected to the switch control sub-circuit.

[0014] When both the first voltage and the second voltage are less than the voltage threshold, but the second voltage is greater than the first voltage, the first switch, the second switch, the third switch and the fourth switch are all closed, the first ideal diode controller cuts off the first power supply, and the second power supply supplies power to all vehicle domain controllers connected to the switch control sub-circuit.

[0015] When both the first voltage and the second voltage are greater than the voltage threshold, the first switch and the second switch are closed, the third switch and the fourth switch are opened, the first power supply supplies power to the vehicle domain controller connected to the first switch, and the second power supply supplies power to the vehicle domain controller connected to the second switch.

[0016] Thirdly, embodiments of this application provide a vehicle, including: the vehicle domain controller power supply circuit provided in the first aspect of embodiments of this application.

[0017] In this embodiment, the power supply circuit for the vehicle domain controller includes: a first voltage comparator, a second voltage comparator, and a switch control subcircuit. The input of the first voltage comparator is connected to a first power supply, and the output of the first voltage comparator is connected to the switch control subcircuit. The input of the second voltage comparator is connected to a second power supply, and the output of the second voltage comparator is connected to the switch control subcircuit. The switch control subcircuit is also connected to the first power supply, the second power supply, and multiple vehicle domain controllers. The first voltage comparator compares a first voltage provided by the first power supply with a voltage threshold, and the second voltage comparator compares a second voltage provided by the second power supply with the voltage threshold, thereby controlling the on / off state of the switches in the switch control subcircuit to supply power to the multiple vehicle domain controllers. The power management system and thermal management system only need to manage two power supplies, namely, the first power supply and the second power supply, reducing the complexity and cost of the power management system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the first structure of the power supply circuit for the vehicle domain controller provided in the embodiments of this application;

[0020] Figure 2 This is a schematic diagram of a switch control sub-circuit provided in an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the enable logic of a switch control sub-circuit provided in an embodiment of this application;

[0022] Figure 4 This is another enable logic diagram of the switch control sub-circuit provided in the embodiments of this application;

[0023] Figure 5 This is a schematic diagram of a second structure of the power supply circuit for the vehicle domain controller provided in an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the third structure of the vehicle domain controller power supply circuit provided in the embodiments of this application;

[0025] Figure 7 This is a schematic diagram of the fourth structure of the vehicle domain controller power supply circuit provided in the embodiments of this application;

[0026] Figure 8 This is a schematic diagram of the fifth structure of the vehicle domain controller power supply circuit provided in the embodiments of this application;

[0027] Figure 9 This is a schematic diagram of the sixth structure of the vehicle domain controller power supply circuit provided in the embodiments of this application;

[0028] Figure 10 This is a schematic diagram of the seventh structure of the vehicle domain controller power supply circuit provided in the embodiments of this application;

[0029] Figure 11 This is the eighth structural schematic diagram of the vehicle domain controller power supply circuit provided in the embodiments of this application. Detailed Implementation

[0030] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0032] The power supply circuit and control method of the vehicle domain controller provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0033] Figure 1 This is a schematic diagram of the first structure of the power supply circuit for the vehicle domain controller provided in this application embodiment. For example... Figure 1As shown, the vehicle domain controller power supply circuit 10 may include: a first voltage comparator 101, a second voltage comparator 102, and a switch control sub-circuit 103. The input terminal of the first voltage comparator 101 is connected to the first power supply 201, and the output terminal of the first voltage comparator 101 is connected to the switch control sub-circuit 103. The input terminal of the second voltage comparator 102 is connected to the second power supply 202, and the output terminal of the second voltage comparator 102 is connected to the switch control sub-circuit 103. The switch control sub-circuit 103 is also connected to the first power supply 201, the second power supply 202, and multiple vehicle domain controllers. The first voltage comparator 101 compares the first voltage provided by the first power supply 201 with a voltage threshold, and the second voltage comparator 102 compares the second voltage provided by the second power supply 202 with the voltage threshold, thereby controlling the switching on and off of the switches in the switch control sub-circuit 103 to supply power to the multiple vehicle domain controllers.

[0034] in, Figure 1 N vehicle domain controllers are shown, namely vehicle domain controller 1, vehicle domain controller 2, ..., vehicle domain controller N.

[0035] In this embodiment, the power supply circuit for the vehicle domain controller includes: a first voltage comparator, a second voltage comparator, and a switch control subcircuit. The input of the first voltage comparator is connected to a first power supply, and the output of the first voltage comparator is connected to the switch control subcircuit. The input of the second voltage comparator is connected to a second power supply, and the output of the second voltage comparator is connected to the switch control subcircuit. The switch control subcircuit is also connected to the first power supply, the second power supply, and multiple vehicle domain controllers. The first voltage comparator compares a first voltage provided by the first power supply with a voltage threshold, and the second voltage comparator compares a second voltage provided by the second power supply with the voltage threshold, thereby controlling the on / off state of the switches in the switch control subcircuit to supply power to the multiple vehicle domain controllers. The power management system and thermal management system only need to manage two power supplies, namely, the first power supply and the second power supply, reducing the complexity and cost of the power management system.

[0036] In some possible implementations of the embodiments of this application, the first voltage comparator 101 and the second voltage comparator 102 may be voltage comparators of the TPS37-Q1 model.

[0037] In some possible implementations of the embodiments of this application, the switch control sub-circuit 103 may include: a first switch, a second switch, a third switch, and a fourth switch, wherein the input terminal of the first switch is connected to a first power supply; the output terminal of the first switch is connected to the input terminal of the third switch, the output terminal of the fourth switch, and a first part of the vehicle domain controllers among the plurality of vehicle domain controllers; the input terminal of the second switch is connected to a second power supply; and the output terminal of the second switch is connected to the input terminal of the fourth switch, the output terminal of the third switch, and a second part of the vehicle domain controllers among the plurality of vehicle domain controllers.

[0038] like Figure 2 As shown, Figure 2 The structure of the switch control sub-circuit is shown. Figure 2 In the configuration, the input terminal of the first switch a is connected to the first power supply 201; the output terminal of the first switch a is connected to the input terminal of the third switch c, the output terminal of the fourth switch d, and the vehicle domain controllers 1 to i respectively; the input terminal of the second switch b is connected to the second power supply 202; the output terminal of the second switch b is connected to the input terminal of the fourth switch d, the output terminal of the third switch c, and the vehicle domain controllers i+1 to N respectively, where i is a natural number, and i+1 is less than or equal to N.

[0039] In some possible implementations of the embodiments of this application, the switch control sub-circuit 103 may further include: a first NAND gate, a second NAND gate, and a third NAND gate, wherein the output terminal of the first voltage comparator is connected to the control terminal of the fourth switch, the first input terminal of the first NAND gate, and the first input terminal of the second NAND gate, respectively; the output terminal of the second voltage comparator is connected to the control terminal of the third switch, the second input terminal of the first NAND gate, and the first input terminal of the third NAND gate, respectively; the output terminal of the first NAND gate is connected to the second input terminal of the second NAND gate and the second input terminal of the third NAND gate, respectively; the output terminal of the second NAND gate is connected to the control terminal of the first switch; and the output terminal of the third NAND gate is connected to the control terminal of the second switch.

[0040] like Figure 3 As shown, Figure 3 An enable logic for a switch control subcircuit is shown. Figure 3 In this circuit, the output of the first voltage comparator 101 is connected to the control terminal of the fourth switch d, the first input terminal of the first NAND gate X, and the first input terminal of the second NAND gate Y, respectively; the output of the second voltage comparator 102 is connected to the control terminal of the third switch c, the second input terminal of the first NAND gate X, and the first input terminal of the third NAND gate Z, respectively; the output of the first NAND gate X is connected to the second input terminal of the second NAND gate Y and the second input terminal of the third NAND gate Z, respectively; the output of the second NAND gate Y is connected to the control terminal of the first switch a; and the output of the third NAND gate Z is connected to the control terminal of the second switch b.

[0041] The following explanation uses the example of the first, second, third, and fourth switches being turned on when their control terminals are at a high level.

[0042] When the voltage supplied by the first power supply 201 is greater than the voltage threshold and the voltage supplied by the second power supply 202 is less than the voltage threshold, the first voltage comparator 101 outputs 0 (low level) and the second voltage comparator 102 outputs 1 (high level). After 0 and 1 are input to the first NAND gate X, the first NAND gate X outputs 1 (high level). After 0 and 1 are input to the second NAND gate Y, the second NAND gate Y outputs 1 (high level). After 1 and 1 are input to the third NAND gate Z, the third NAND gate Z outputs 0 (low level). At this time, the first switch a and the third switch c are closed, and the second switch b and the fourth switch d are open, and the first power supply 201 supplies power to all vehicle domain controllers.

[0043] When the voltage supplied by the first power supply 201 is less than the voltage threshold and the voltage supplied by the second power supply 202 is greater than the voltage threshold, the first voltage comparator 101 outputs 1 (high level), and the second voltage comparator 102 outputs 0 (low level). After 0 and 1 are input to the first NAND gate X, the first NAND gate X outputs 1 (high level). After 1 and 1 are input to the second NAND gate Y, the second NAND gate Y outputs 0 (low level). After 1 and 0 are input to the third NAND gate Z, the third NAND gate Z outputs 1 (high level). At this time, the second switch b and the fourth switch d are closed, and the first switch a and the third switch c are open, allowing the first power supply 202 to power all vehicle domain controllers.

[0044] When the voltage provided by the first power supply 201 and the voltage provided by the second power supply 202 are both less than the voltage threshold, but the voltage provided by the first power supply 201 is greater than the voltage provided by the second power supply 202, the first voltage comparator 101 outputs 1 (i.e., a high level), and the second voltage comparator 102 also outputs 1 (i.e., a high level). When 1 and 1 are input to the first NAND gate X, the first NAND gate X outputs 0 (i.e., a low level). When 0 and 1 are input to the second NAND gate Y, the second NAND gate Y outputs 1 (i.e., a high level). When 0 and 1 are input to the third NAND gate Z, the third NAND gate Z outputs 1 (i.e., a high level). At this time, the first switch a, the second switch b, the third switch c, and the fourth switch d are all closed, and the first power supply 201 and the second power supply 202 simultaneously power all vehicle domain controllers.

[0045] When the voltage provided by the first power supply 201 and the voltage provided by the second power supply 202 are both less than the voltage threshold, but the voltage provided by the first power supply 201 is less than the voltage provided by the second power supply 202, the first voltage comparator 101 outputs 1 (high level), and the second voltage comparator 102 also outputs 1 (high level). When 1 and 1 are input to the first NAND gate X, the first NAND gate X outputs 0 (low level). When 0 and 1 are input to the second NAND gate Y, the second NAND gate Y outputs 1 (high level). When 0 and 1 are input to the third NAND gate Z, the third NAND gate Z outputs 1 (high level). At this time, the first switch a, the second switch b, the third switch c, and the fourth switch d are all closed, and the first power supply 201 and the second power supply 202 simultaneously power all vehicle domain controllers.

[0046] When the voltage provided by the first power supply 201 and the voltage provided by the second power supply 202 are both greater than the voltage threshold, the first voltage comparator 101 outputs 0 (low level), and the second voltage comparator 102 also outputs 0 (low level). After 0 and 1 are input to the first NAND gate X, the first NAND gate X outputs 1 (high level). After 0 and 1 are input to the second NAND gate Y, the second NAND gate Y outputs 1 (high level). After 0 and 1 are input to the third NAND gate Z, the third NAND gate Z outputs 1 (high level). At this time, the first switch a and the second switch b are closed, and the third switch c and the fourth switch d are open. The first power supply 201 supplies power to the vehicle domain controller connected to the first switch a, and the first power supply 202 supplies power to the vehicle domain controller connected to the second switch b.

[0047] In some possible implementations of the embodiments of this application, the first switch a and the second switch b can be ideal diode controllers of the LTC4368 type, and the third switch c and the fourth switch d can be ideal diode controllers of the LM7480-Q1 type. When performing switch on / off control, it can be achieved by driving an external back-to-back NMOS transistor.

[0048] In this embodiment, by detecting the relationship between the two power supplies and the voltage threshold, the switching of the power supply path of the vehicle domain controller can be directly realized through hardware without software intervention. The response speed is fast, and the voltage threshold range, hysteresis voltage range, and power consumption current are extremely small.

[0049] In some possible implementations of embodiments of this application, the switch control sub-circuit further includes: a third power supply and twelve metal-oxide-semiconductor field-effect transistors (MOSFETs, or MOS for short), wherein the twelve MOSFETs are respectively the first MOSFET to the twelfth MOSFET; the drains of all twelve MOSFETs are connected to the third power supply, and the sources of all twelve MOSFETs are grounded; the output terminal of the first voltage comparator is connected to the control terminal of the fourth switch, the gate of the second MOSFET, and the gate of the sixth MOSFET; the gates of the first MOSFET, the third MOSFET, the fourth MOSFET, and the fifth MOSFET are all connected to the third power supply; the output terminal of the second voltage comparator is connected to the control terminal of the third switch, the gate of the eighth MOSFET, and the gate of the twelfth MOSFET; the gates of the seventh MOSFET, the ninth MOSFET, the tenth MOSFET, and the eleventh MOSFET are all connected to the third power supply; the drain of the third MOSFET is also connected to the control terminal of the first switch; and the drain of the ninth MOSFET is also connected to the control terminal of the second switch.

[0050] like Figure 4 As shown, Figure 4 Another enable logic for the switch control sub-circuit is shown. In Figure 4 In this circuit, all twelve MOSFETs are NMOS transistors, designated as Q1 to Q12. The drains of all twelve MOSFETs are connected to the third power supply 203, and the sources of all twelve MOSFETs are grounded. The output of the first voltage comparator 101 is connected to the control terminal of the fourth switch d, the gate of Q2, and the gate of Q6. The gates of Q1, Q3, Q4, and Q5 are all connected to the third power supply 203. The output of the second voltage comparator 102 is connected to the control terminal of the third switch c, the gate of Q8, and the gate of Q12. The gates of Q7, Q9, Q10, and Q11 are all connected to the third power supply 203. The drain of Q3 is also connected to the control terminal of the first switch a, and the drain of Q9 is also connected to the control terminal of the second switch b.

[0051] The following explanation uses the example of the first, second, third, and fourth switches being turned on when their control terminals are at a high level.

[0052] When the voltage provided by the first power supply 201 is greater than the voltage threshold and the voltage provided by the second power supply 202 is less than the voltage threshold, the first voltage comparator 101 outputs 0, i.e., outputs a low level, and the second voltage comparator 102 outputs 1, i.e., outputs a high level. The gate-source voltage of Q6 is 0, so Q6 is not conducting. The gate voltage of Q5 is pulled up to the voltage provided by the third power supply 203, so Q5 conducts. Q4 is not conducting because its gate is pulled down to ground by the conduction of Q5. The gate-source voltage of Q2 is 0, so Q2 is not conducting. The gate voltage of Q1 is pulled up to the voltage provided by the third power supply 203, so Q1 conducts. The gate of Q3 is pulled down to ground by the conduction of Q1 and is not conducting. The control terminal of the first switch a is pulled up to the voltage provided by the third power supply 203, and the control terminal of the first switch a is at a high point. Similarly, Q7 is not conducting, Q8 is conducting, Q9 is conducting, Q10 is not conducting, Q11 is not conducting, and Q12 is conducting. The control terminal of the second switch b is pulled down to ground by the conduction of Q9, and the control terminal of the second switch b is at a low point. At this time, the first switch a and the third switch c are closed, and the second switch b and the fourth switch d are open. The first power supply 201 supplies power to all vehicle domain controllers.

[0053] Similarly, when the voltage provided by the first power supply 201 is less than the voltage threshold and the voltage provided by the second power supply 202 is greater than the voltage threshold, the first switch a and the third switch c are opened, and the second switch b and the fourth switch d are closed, and the first power supply 202 supplies power to all vehicle domain controllers.

[0054] When the voltage provided by the first power supply 201 and the voltage provided by the second power supply 202 are both less than the voltage threshold, but the voltage provided by the first power supply 201 is greater than the voltage provided by the second power supply 202, the first voltage comparator 101 outputs 1, that is, outputs a high level, and the second voltage comparator 102 outputs 1, that is, outputs a high level. The gate-source voltage of Q6 is 1, so Q6 is turned on. The gate voltage of Q5 is pulled down to ground and not turned on. The gate voltage of Q4 is pulled up to the voltage provided by the third power supply 203, so Q4 is turned on. The gate-source voltage of Q2 is 1, so Q2 is turned on. The gate voltage of Q1 is pulled down to ground and not turned on. The gate of Q3 is turned on by Q4 and pulled down to ground and not turned on. The control terminal of the first switch a is pulled up to the voltage provided by the third power supply 203, and the control terminal of the first switch a is at a high level. Similarly, Q7 is not turned on, Q8 is turned on, Q9 is not turned on, Q10 is not turned on, Q11 is not turned on, and Q12 is turned on. The control terminal of the second switch b is pulled up to the voltage provided by the third power supply 203, and the control terminal of the second switch b is at a high level. At this time, the first switch a, the second switch b, the third switch c, and the fourth switch d are all closed, and the first power supply 201 and the second power supply 202 simultaneously supply power to all vehicle domain controllers.

[0055] Similarly, when the voltage provided by the first power supply 201 and the voltage provided by the second power supply 202 are both less than the voltage threshold, but the voltage provided by the first power supply 201 is less than the voltage provided by the second power supply 202, the first switch a, the second switch b, the third switch c and the fourth switch d are all closed, and the first power supply 201 and the second power supply 202 simultaneously supply power to all vehicle domain controllers.

[0056] When the voltage provided by the first power supply 201 and the voltage provided by the second power supply 202 are both greater than the voltage threshold, the first voltage comparator 101 outputs 0, that is, outputs a low level, and the second voltage comparator 102 outputs 0, that is, outputs a low level. The gate-source voltage of Q6 is 0, so Q6 is not conducting. The gate voltage of Q5 is pulled up to the voltage provided by the third power supply 203, so Q5 is conducting. Q4 is not conducting because its gate is pulled down to ground by the conducting power supply of Q5. The gate-source voltage of Q2 is 0, so Q2 is not conducting. The gate voltage of Q1 is pulled up to the voltage provided by the third power supply 203, so Q1 is conducting. The gate of Q3 is pulled down to ground by the conducting power supply of Q1, so Q3 is not conducting. The control terminal of the first switch a is pulled up to the voltage provided by the third power supply 203, and the control terminal of the first switch a is at a high level. Similarly, Q7 is not conducting, Q8 is conducting, Q9 is not conducting, Q10 is not conducting, Q11 is not conducting, and Q12 is conducting. The control terminal of the second switch b is pulled up to the voltage provided by the third power supply 203, and the control terminal of the second switch b is at a high level. At this time, the first switch a and the second switch b are closed, the third switch c and the fourth switch d are open, the first power supply 201 supplies power to the vehicle domain controller connected to the first switch a, and the first power supply 202 supplies power to the vehicle domain controller connected to the second switch b.

[0057] In this embodiment, by detecting the relationship between the two power supplies and the voltage threshold, the switching of the power supply path of the vehicle domain controller can be directly realized through hardware without software intervention. This results in a fast response speed, a wide voltage threshold range, a large hysteresis voltage range, and extremely low power consumption. Furthermore, the enable logic control circuit built using MOSFETs draws only tens of microamps, compared to the hundreds of microamps drawn by NAND gates. The MOSFET-based enable logic control circuit draws significantly less current and consumes less power.

[0058] In some possible implementations of the embodiments of this application, in order to prevent the voltage provided by one power supply from flowing back into another power supply when the first switch a, the second switch b, the third switch c, and the fourth switch d are all closed, the vehicle domain controller power supply circuit provided in the embodiments of this application further includes: a first ideal diode controller and a second ideal diode controller, wherein one end of the first ideal diode controller is connected to the first power supply and the other end is connected to the switch control sub-circuit; one end of the second ideal diode controller is connected to the second power supply and the other end is connected to the switch control sub-circuit.

[0059] For example, such as Figure 5 As shown. In Figure 5 In the circuit, one end of the first ideal diode controller 104 is connected to the first power supply 201, and the other end is connected to the switch control sub-circuit 103; one end of the second ideal diode controller 105 is connected to the second power supply 202, and the other end is connected to the switch control sub-circuit 103.

[0060] In some possible implementations of the embodiments of this application, the first ideal diode controller and the second ideal diode controller in the embodiments of this application may be LM74700-Q1 type ideal diode controller.

[0061] In some possible implementations of the embodiments of this application, when a first ideal diode controller 104 and a second ideal diode controller 105 are present, one end of the first voltage comparator 101 can be connected to the output terminal of the first ideal diode controller 104, and the other end of the first voltage comparator 101 can be connected to the switch control sub-circuit 103; one end of the second voltage comparator 102 can be connected to the output terminal of the second ideal diode controller 105, and the other end of the second voltage comparator 102 can be connected to the switch control sub-circuit 103.

[0062] When the switch control sub-circuit 103 uses NAND gates or MOSFETs for enable logic control, such as Figure 3 and Figure 4 As shown. When the voltage provided by the first power supply 201 and the voltage provided by the second power supply 202 are both less than the voltage threshold, but the voltage provided by the first power supply 201 is greater than the voltage provided by the second power supply 202, the first switch a, the second switch b, the third switch c, and the fourth switch d are all closed, and the second ideal diode controller 105 will cut off the second power supply 202. At this time, the first power supply 201 supplies power to all vehicle domain controllers. When the voltage provided by the first power supply 201 and the voltage provided by the second power supply 202 are both less than the voltage threshold, but the voltage provided by the first power supply 201 is less than the voltage provided by the second power supply 202, the first switch a, the second switch b, the third switch c, and the fourth switch d are all closed, and the first ideal diode controller 104 will cut off the second power supply 201. At this time, the second power supply 202 supplies power to all vehicle domain controllers.

[0063] In the embodiments of this application, it is possible to prevent the voltage supplied by one power source from flowing back into another power source.

[0064] In some possible implementations of the embodiments of this application, in order to minimize the AC cost in the pulsating DC voltage and retain its DC component, thereby reducing the output voltage ripple coefficient and making the waveform smoother, the vehicle domain controller power supply circuit provided in the embodiments of this application further includes: a first filter sub-circuit and a second filter sub-circuit, wherein one end of the first filter sub-circuit is connected to the first power supply and the other end is connected to the switch control sub-circuit; one end of the second filter sub-circuit is connected to the second power supply and the other end is connected to the switch control sub-circuit.

[0065] For example, such as Figure 6 As shown. In Figure 6 In the circuit, one end of the first filter sub-circuit 106 is connected to the first power supply 201, and the other end is connected to the switch control sub-circuit 103; one end of the second filter sub-circuit 107 is connected to the second power supply 202, and the other end is connected to the switch control sub-circuit 103.

[0066] In the embodiments of this application, the voltage ripple coefficient provided by the first power supply and the second power supply can be reduced, making the voltage waveform smoother.

[0067] In some possible implementations of the embodiments of this application, when a first ideal diode controller 104 and a second ideal diode controller 105 are present, one end of the first filter sub-circuit 106 can be connected to the output terminal of the first ideal diode controller 104, and the other end of the first filter sub-circuit 106 can be connected to the switch control sub-circuit 103; one end of the second filter sub-circuit 107 can be connected to the output terminal of the second ideal diode controller 105, and the other end of the second filter sub-circuit 107 can be connected to the switch control sub-circuit 103.

[0068] In some possible implementations of the embodiments of this application, when there is a first filter sub-circuit 106 and a second filter sub-circuit 107, one end of the first voltage comparator 101 can be connected to the output terminal of the first filter sub-circuit 106, and the other end of the first voltage comparator 101 can be connected to the switch control sub-circuit 103; one end of the second voltage comparator 102 can be connected to the output terminal of the second filter sub-circuit 107, and the other end of the second voltage comparator 102 can be connected to the switch control sub-circuit 103.

[0069] In some possible implementations of the embodiments of this application, in order to provide the vehicle domain controller with the commonly used voltage, the vehicle domain controller power supply circuit provided in the embodiments of this application further includes: a boost module, wherein the boost module includes multiple boost sub-circuits, one end of each boost sub-circuit is connected to a switch control sub-circuit, and the other end is connected to a vehicle domain controller.

[0070] For example, such as Figure 7 As shown. In Figure 7In the above, the boost module 108 includes N boost sub-circuits, namely boost sub-circuit 1, boost sub-circuit 2, ..., boost sub-circuit N. One end of boost sub-circuit i is connected to the switch control sub-circuit 103, and the other end is connected to the vehicle domain controller i, where i is a positive integer less than or equal to N.

[0071] In some possible implementations of the embodiments of this application, the boost sub-circuit can be boosted using a dual-phase synchronous boost controller MAX25203.

[0072] In this embodiment of the application, the voltage is boosted by a boost module to meet the voltage requirements of each vehicle domain controller.

[0073] In some possible implementations of the embodiments of this application, in order to provide overcurrent protection for the vehicle domain controller, the power supply circuit of the vehicle domain controller provided in the embodiments of this application further includes an overcurrent protection module, wherein the overcurrent protection module includes multiple overcurrent protection sub-circuits, one end of each overcurrent protection sub-circuit is connected to a switch control sub-circuit, and the other end is connected to a vehicle domain controller.

[0074] For example, such as Figure 8 As shown. In Figure 8 In the above, the overcurrent protection module 109 includes N overcurrent protection sub-circuits, namely overcurrent protection sub-circuit 1, overcurrent protection sub-circuit 2, ..., overcurrent protection sub-circuit N. One end of overcurrent protection sub-circuit i is connected to the switch control sub-circuit 103, and the other end is connected to the vehicle domain controller i, where i is a positive integer less than or equal to N.

[0075] In some possible implementations of the embodiments of this application, the overcurrent protection sub-circuit can be overcurrent protected using an ideal diode controller of the LTC4368 model.

[0076] In some possible implementations of the embodiments of this application, when a boost module is present, one end of the overcurrent protection sub-circuit i can be connected to the output terminal of the boost sub-circuit i, and the other end can be connected to the vehicle domain controller i.

[0077] In this embodiment of the application, overcurrent protection can be provided for the vehicle domain controller.

[0078] In some possible implementations of the embodiments of this application, the vehicle domain controller power supply circuit provided in the embodiments of this application further includes: a power supply circuit, wherein the power supply circuit includes a linear regulator, a first diode and a second diode; the output terminal of the linear regulator is connected to the switch control sub-circuit; the input terminal of the linear regulator is connected to the cathode of the first diode and the cathode of the second diode respectively; the anode of the first diode is connected to a first power supply; and the anode of the second diode is connected to a second power supply.

[0079] In some possible implementations of the embodiments of this application, the linear regulator can be a low-dropout linear regulator (LDO).

[0080] For example, such as Figure 9 As shown. In Figure 9 In the circuit 110, the power supply circuit includes an LDO, a first diode D1, and a second diode D2. The output terminal of the LDO is connected to the switch control sub-circuit 103, and the input terminal of the LDO is connected to the cathodes of D1 and D2, respectively. The anode of D1 is connected to the first power supply 201, and the anode of D2 is connected to the second power supply 202.

[0081] In some possible implementations of the embodiments of this application, the vehicle domain controller power supply circuit provided in the embodiments of this application further includes: an overcurrent and undervoltage detection module, wherein the overcurrent and undervoltage detection module includes a four-input NAND gate, an OR gate, and an AND gate; the four inputs of the four-input NAND gate are respectively used to receive undervoltage detection signals for four switches; the two inputs of the OR gate are used to receive overcurrent detection signals for the first switch and the second switch; the two inputs of the AND gate are respectively connected to the output of the four-input NAND gate and the output of the OR gate; the output of the AND gate is connected to multiple vehicle domain controllers.

[0082] For example, such as Figure 10 As shown. In Figure 10 In the above, the overcurrent and undervoltage detection module 111 includes a four-input NAND gate, an OR gate, and an AND gate; the four inputs of the four-input NAND gate are used to receive undervoltage detection signals for the four switches respectively; the two inputs of the OR gate are used to receive overcurrent detection signals for the first switch a and the second switch b respectively; the two inputs of the AND gate are connected to the outputs of the four-input NAND gate and the OR gate respectively; and the output of the AND gate is connected to multiple vehicle domain controllers.

[0083] This application does not limit the methods used for undervoltage detection and overcurrent detection; any available method can be applied to the embodiments of this application. When the switch uses an ideal diode controller of the LTC4368 type, since the LTC4368 has an overcurrent detection function, it can directly output an overcurrent detection signal.

[0084] In this embodiment, after receiving the AND gate output, multiple vehicle domain controllers can change their own operating state according to the AND gate output. The vehicle domain controllers include, but are not limited to, sleep state and normal state. For example, when the AND gate outputs 1, it indicates that there is undervoltage and overcurrent, and the vehicle domain controller can switch to sleep state. When the AND gate outputs 0, it indicates that there is undervoltage but no overcurrent, no undervoltage but overcurrent, or neither undervoltage nor overcurrent, and the vehicle domain controller can switch to normal state.

[0085] Figure 11This is the eighth structural schematic diagram of the vehicle domain controller power supply circuit provided in the embodiments of this application. Figure 11 The diagram shows two power supplies providing power to three vehicle-mounted domain controllers.

[0086] The first power supply 201 is connected to the input terminal of the first ideal diode controller 104, the output terminal of the first ideal diode controller 104 is connected to the input terminal of the first filter sub-circuit 106, and the output terminal of the first filter sub-circuit 106 is connected to the input terminal of the first switch a in the switch control sub-circuit 103.

[0087] The second power supply 202 is connected to the input terminal of the second ideal diode controller 105, the output terminal of the second ideal diode controller 105 is connected to the input terminal of the second filter sub-circuit 107, and the output terminal of the second filter sub-circuit 107 is connected to the input terminal of the second switch b in the switch control sub-circuit 103.

[0088] The output terminal of the first switch a is connected to the input terminal of the third switch c in the switch control sub-circuit 103, the output terminal of the fourth switch d in the switch control sub-circuit 103, the input terminal of the boost sub-circuit 1 in the boost module 108, and the input terminal of the boost sub-circuit 2 in the boost module 108, respectively.

[0089] The output terminal of the second switch b is connected to the output terminal of the third switch c, the input terminal of the fourth switch d, and the input terminal of the boost sub-circuit 3 in the boost module 108.

[0090] The output terminals of boost circuit 1, boost circuit 2, and boost circuit 3 are respectively connected to the input terminals of overcurrent protection circuit 1, overcurrent protection circuit 2, and overcurrent protection circuit 3 in overcurrent protection module 109.

[0091] The output terminals of overcurrent protection sub-circuit 1, overcurrent protection sub-circuit 2, and overcurrent protection sub-circuit 3 are respectively connected to vehicle domain controller 1, vehicle domain controller 2, and vehicle domain controller 3.

[0092] The output terminal of the linear regulator of the power supply circuit 110 is connected to the switch control sub-circuit 103; the input terminal of the linear regulator is connected to the cathode of the first diode D1 and the cathode of the second diode D2 respectively; the anode of the first diode D1 is connected to the output terminal of the first filter sub-circuit 106; and the anode of the second diode D2 is connected to the output terminal of the second filter sub-circuit 107.

[0093] The input terminal of the first voltage comparator 101 is connected to the output terminal of the first filter sub-circuit 106, and the output terminal of the first voltage comparator 101 is connected to the switch control sub-circuit 103. The input terminal of the second voltage comparator 102 is connected to the output terminal of the second filter sub-circuit 107, and the output terminal of the second voltage comparator 102 is connected to the switch control sub-circuit 103.

[0094] The first voltage comparator 101 compares the voltage provided by the first power supply 201 with the voltage threshold, and the second voltage comparator 102 compares the voltage provided by the second power supply 202 with the voltage threshold, so as to control the on / off state of the first switch a, the second switch b, the third switch c and the fourth switch d to supply power to the vehicle domain controller 1, the vehicle domain controller 2 and the vehicle domain controller 3.

[0095] The four inputs of the four-input NAND gate of the overcurrent and undervoltage detection module 111 are used to receive undervoltage detection signals for the four switches respectively; the two inputs of the OR gate of the overcurrent and undervoltage detection module 111 are used to receive overcurrent detection signals for the first switch a and the second switch b; the two inputs of the AND gate of the overcurrent and undervoltage detection module 111 are connected to the outputs of the four-input NAND gate and the OR gate respectively; the output of the AND gate is connected to the three vehicle domain controllers (vehicle domain controller 1, vehicle domain controller 2, and vehicle domain controller 3) respectively.

[0096] exist Figure 11 In this circuit, the first ideal diode controller 104 and the second ideal diode controller 105 adopt LM74700-Q1; the first switch a and the second switch b adopt LTC4368; the third switch c and the fourth switch d adopt LM7480-Q1; the boost sub-circuit adopts MAX25203; the overcurrent protection sub-circuit adopts LTC4368 combined with NMOS; the linear regulator adopts LDO; and the voltage comparator adopts TPS37-Q1.

[0097] This application also provides a control method applied to the vehicle domain controller power supply circuit provided in this application, which includes a first switch, a second switch, a third switch, a fourth switch, a first ideal diode controller, and a second ideal diode controller.

[0098] The control method provided in this application embodiment may include:

[0099] When the first voltage provided by the first power supply is greater than the voltage threshold but the second voltage provided by the second power supply is less than the voltage threshold, the first and third switches of the control switch control subcircuit are closed, the second and fourth switches of the switch control subcircuit are open, and the first power supply provides power to all vehicle domain controllers connected to the switch control subcircuit.

[0100] When the second voltage is greater than the voltage threshold but the first voltage is less than the voltage threshold, the second and fourth switches are closed, the first and third switches are opened, and the second power supply provides power to all vehicle domain controllers connected to the switch control sub-circuit.

[0101] When both the first voltage and the second voltage are less than the voltage threshold but the first voltage is greater than the second voltage, the first switch, the second switch, the third switch and the fourth switch are all closed, the second ideal diode controller cuts off the second power supply, and the first power supply supplies power to all vehicle domain controllers connected to the switch control sub-circuit.

[0102] When both the first voltage and the second voltage are less than the voltage threshold, but the second voltage is greater than the first voltage, the first switch, the second switch, the third switch and the fourth switch are all closed, the first ideal diode controller cuts off the first power supply, and the second power supply supplies power to all vehicle domain controllers connected to the switch control sub-circuit.

[0103] When both the first voltage and the second voltage are greater than the voltage threshold, the first switch and the second switch are closed, the third switch and the fourth switch are opened, the first power supply supplies power to the vehicle domain controller connected to the first switch, and the second power supply supplies power to the vehicle domain controller connected to the second switch.

[0104] This application also provides a vehicle, which includes: the vehicle domain controller power supply circuit provided in this application embodiment.

[0105] The above description is merely a specific embodiment of this application. It should be understood that the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the scope of the technology disclosed in this application, and such modifications or substitutions should all be covered within the scope of protection of this application.

Claims

1. A power supply circuit for an on-board domain controller, characterized in that, The power supply circuit for the vehicle-mounted domain controller includes: a first voltage comparator, a second voltage comparator, and a switch control sub-circuit, wherein... The input terminal of the first voltage comparator is connected to the first power supply, and the output terminal of the first voltage comparator is connected to the switch control sub-circuit. The input terminal of the second voltage comparator is connected to the second power supply, and the output terminal of the second voltage comparator is connected to the switch control sub-circuit. The switch control sub-circuit is also connected to the first power supply, the second power supply, and multiple vehicle domain controllers. The first voltage comparator compares the first voltage provided by the first power supply with the magnitude of a voltage threshold, and the second voltage comparator compares the second voltage provided by the second power supply with the magnitude of the voltage threshold, so as to control the on / off state of the switch in the switch control sub-circuit to supply power to the plurality of vehicle domain controllers; The switch control sub-circuit includes: a first switch, a second switch, a third switch, and a fourth switch, wherein, The input terminal of the first switch is connected to the first power supply; The output terminal of the first switch is connected to the input terminal of the third switch, the output terminal of the fourth switch, and the first part of the vehicle domain controllers among the plurality of vehicle domain controllers; The input terminal of the second switch is connected to the second power supply; The output terminal of the second switch is connected to the input terminal of the fourth switch, the output terminal of the third switch, and the second part of the vehicle domain controllers among the plurality of vehicle domain controllers; The switch control sub-circuit further includes: a first NAND gate, a second NAND gate, and a third NAND gate, wherein... The output terminal of the first voltage comparator is connected to the control terminal of the fourth switch, the first input terminal of the first NAND gate, and the first input terminal of the second NAND gate, respectively. The output of the second voltage comparator is connected to the control terminal of the third switch, the second input terminal of the first NAND gate, and the first input terminal of the third NAND gate, respectively. The output of the first NAND gate is connected to the second input of the second NAND gate and the second input of the third NAND gate, respectively. The output of the second NAND gate is connected to the control terminal of the first switch; The output of the third NAND gate is connected to the control terminal of the second switch.

2. The vehicle-mounted domain controller power supply circuit according to claim 1, characterized in that, The switch control sub-circuit further includes: a third power supply and twelve MOSFETs, wherein the twelve MOSFETs are the first MOSFET to the twelfth MOSFET; The drains of all twelve MOS transistors are connected to the third power supply, and the sources of all twelve MOS transistors are grounded. The output terminal of the first voltage comparator is connected to the control terminal of the fourth switch, the gate of the second MOSFET, and the gate of the sixth MOSFET, respectively. The gates of the first MOSFET, the third MOSFET, the fourth MOSFET, and the fifth MOSFET are all connected to the third power supply. The output terminal of the second voltage comparator is connected to the control terminal of the third switch, the gate of the eighth MOS transistor, and the gate of the twelfth MOS transistor, respectively. The gates of the seventh MOSFET, the ninth MOSFET, the tenth MOSFET, and the eleventh MOSFET are all connected to the third power supply. The drain of the third MOS transistor is also connected to the control terminal of the first switch; The drain of the ninth MOS transistor is also connected to the control terminal of the second switch.

3. The vehicle-mounted domain controller power supply circuit according to claim 1, characterized in that, The vehicle-mounted domain controller power supply circuit further includes: a first ideal diode controller and a second ideal diode controller, wherein... One end of the first ideal diode controller is connected to the first power supply, and the other end is connected to the switch control sub-circuit; One end of the second ideal diode controller is connected to the second power supply, and the other end is connected to the switch control sub-circuit.

4. The vehicle-mounted domain controller power supply circuit according to claim 1, characterized in that, The power supply circuit for the vehicle domain controller also includes: a boost module, wherein... The boost module includes multiple boost sub-circuits, each of which is connected at one end to the switch control sub-circuit and at the other end to an on-board domain controller.

5. The vehicle-mounted domain controller power supply circuit according to claim 1, characterized in that, The power supply circuit for the vehicle-mounted domain controller also includes an overcurrent protection module, wherein... The overcurrent protection module includes multiple overcurrent protection sub-circuits, one end of which is connected to the switch control sub-circuit, and the other end is connected to an on-board domain controller.

6. The vehicle-mounted domain controller power supply circuit according to claim 1, characterized in that, The power supply circuit for the vehicle domain controller further includes: an electronic power supply circuit, wherein... The power supply circuit includes a linear regulator, a first diode, and a second diode; The output terminal of the linear regulator is connected to the switch control sub-circuit. The input terminal of the linear regulator is connected to the cathode of the first diode and the cathode of the second diode, respectively. The anode of the first diode is connected to the first power supply; The anode of the second diode is connected to the second power supply.

7. The vehicle-mounted domain controller power supply circuit according to claim 1, characterized in that, The vehicle-mounted domain controller power supply circuit also includes: an overcurrent and undervoltage detection module, wherein... The overcurrent and undervoltage detection module includes a four-input NAND gate, an OR gate, and an AND gate; The four inputs of the four-input NAND gate are used to receive undervoltage detection signals for the four switches, respectively. The two inputs of the OR gate are used to receive overcurrent detection signals for the first switch and the second switch; The two input terminals of the AND gate are respectively connected to the output terminal of the four-input NAND gate and the output terminal of the OR gate; The output of the AND gate is connected to the plurality of vehicle domain controllers.

8. A control method, characterized in that, The control method is applied to the vehicle domain controller power supply circuit according to claim 3, and the control method includes: When the first voltage is greater than the voltage threshold but the second voltage is less than the voltage threshold, the first switch and the third switch are closed, the second switch and the fourth switch are opened, and the first power supply provides power to all vehicle domain controllers connected to the switch control sub-circuit. When the second voltage is greater than the voltage threshold but the first voltage is less than the voltage threshold, the second switch and the fourth switch are controlled to close, the first switch and the third switch are opened, and the second power supply supplies power to all vehicle domain controllers connected to the switch control sub-circuit. When both the first voltage and the second voltage are less than the voltage threshold but the first voltage is greater than the second voltage, the first switch, the second switch, the third switch and the fourth switch are all closed, the second ideal diode controller cuts off the second power supply, and the first power supply supplies power to all vehicle domain controllers connected to the switch control sub-circuit. When both the first voltage and the second voltage are less than the voltage threshold, but the second voltage is greater than the first voltage, the first switch, the second switch, the third switch and the fourth switch are all closed, the first ideal diode controller cuts off the first power supply, and the second power supply supplies power to all vehicle domain controllers connected to the switch control sub-circuit. When both the first voltage and the second voltage are greater than the voltage threshold, the first switch and the second switch are closed, the third switch and the fourth switch are opened, the first power supply supplies power to the vehicle domain controller connected to the first switch, and the second power supply supplies power to the vehicle domain controller connected to the second switch.

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