High-pressure power domain controller and vehicle

Abstract

The invention provides a high-voltage power domain controller and a vehicle, in the high-voltage power domain controller, the output of a direct-current converter supplies power to a lower-bridge driving power supply of a motor controller through a lower-bridge driving power supply switch module, the output of the direct-current converter and a low-voltage KL30 power supply are backups for each other, and a low-voltage storage battery and the direct-current converter are connected through a low-voltage power supply switch module. When overload or short circuit occurs in the low-voltage system power supply of the low-voltage KL30 path, the output of the direct-current converter can be actively cut off based on the low-voltage power supply switch module, so that the direct-current converter can normally supply power to the lower bridge driving chip and the ASC logic processing circuit; therefore, the motor controller can enter a three-phase active short-circuit safety state. Thus, the output of the direct current converter at the front end of the low-voltage power supply switch module is used for supplying power to part of the system of the motor controller, power supply of a high-voltage backup power supply in a special fault mode is replaced, and the cost and the system fault rate are effectively reduced.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and more specifically, to a high-voltage power domain controller and a vehicle. Background Technology

[0002] As consumers increasingly demand higher reliability and safety from vehicles, the importance and necessity of functional safety design are becoming increasingly prominent among automobile manufacturers. Currently, the power architecture of automotive motor controllers primarily consists of the vehicle's DC-DC converter and a low-voltage battery connected in parallel to power the low-voltage system of the motor controller. To prevent the motor controller from failing to enter the active short-circuit safety state due to low-voltage power supply anomalies, a high-voltage backup power supply is included in the motor controller to power the lower bridge driver chip and ASC logic processing circuit when the low-voltage power supply system is abnormal. However, this high-voltage backup power supply does not participate in the controller's operation most of the time, which leads to significant waste and can easily increase the system failure rate. Summary of the Invention

[0003] The purpose of this application is to provide a high-voltage power domain controller, which aims to solve the problem in related technologies that motor controllers need to be equipped with high-voltage backup power supplies, resulting in waste and an increased system failure rate.

[0004] In a first aspect, this application provides a high-voltage power domain controller, comprising a low-voltage battery, a DC-DC converter, a motor controller, a low-voltage power supply switch module, and a lower-bridge drive power supply switch module; the low-voltage power supply switch module is connected between the low-voltage battery and the DC-DC converter, and is used to control the connection state between the low-voltage battery and the DC-DC converter; the output terminal of the low-voltage battery is connected to the lower-bridge drive power supply switch module; one end of the lower-bridge drive power supply switch module is connected between the DC-DC converter and the low-voltage power supply switch module, and the other end is connected to the lower-bridge drive power supply of the motor controller; the lower-bridge drive power supply is used to power the lower-bridge drive chip and ASC logic processing circuit of the motor controller; the opening and closing of the lower-bridge drive power supply switch module is based on the microprocessor enable control of the motor controller; the microprocessor is also used to control the low-voltage power supply switch module to close when the external low-voltage power supply to the motor controller is normal, so that the low-voltage battery and the DC-DC converter jointly supply power to the lower-bridge drive power supply, and to control the low-voltage power supply switch module to open when the external low-voltage power supply to the motor controller is abnormal, so that the DC-DC converter supplies power to the lower-bridge drive power supply alone.

[0005] In the above implementation process, a high-voltage power domain controller is provided. In this controller, the output of the DC-DC converter supplies power to the lower-bridge drive power supply of the motor controller through a lower-bridge drive power switch module, serving as a backup for the low-voltage KL30 power supply. The low-voltage battery and the DC-DC converter are connected through the low-voltage power supply switch module. When the low-voltage KL30 power supply to the vehicle's low-voltage system experiences an overload or short circuit, the low-voltage power supply switch module can actively disconnect the output of this DC-DC converter, ensuring that the DC-DC converter can still normally supply power to the lower-bridge drive chip and ASC logic processing circuit, thereby enabling the motor controller to enter a safe state of three-phase active short circuit. Thus, using the output of the DC-DC converter at the front end of the low-voltage power supply switch module to power part of the motor controller system, replacing the high-voltage backup power supply in special fault modes, effectively reduces costs and system failure rate.

[0006] Furthermore, in some examples, the low-voltage power supply switching module includes the PMOS switch of the DC-DC converter.

[0007] In the above implementation process, the high-voltage power domain controller reuses the PMOS switch of the DC-DC converter. When the low-voltage power supply of the vehicle's low-voltage system via the KL30 circuit is overloaded or short-circuited, it actively cuts off the output of this DC-DC converter, ensuring that the DC-DC converter can still work normally to supply power to other low-voltage systems not powered by KL30. In this way, by reusing the PMOS switch of the DC-DC converter, the cost can be effectively reduced.

[0008] Furthermore, in some examples, the low-voltage power supply switch module also includes an Oring switch for the DC converter; the Oring switch is used to prevent the current from the low-voltage battery from flowing back into the DC converter when a short circuit occurs inside the DC converter.

[0009] In the above implementation process, by reusing the Oring switch of the DCDC, it is possible to prevent the current from the low-voltage battery from flowing back into the DCDC and causing abnormal power supply to other networks in the vehicle that are powered by the low-voltage KL30 when a short circuit occurs inside the DCDC.

[0010] Furthermore, in some examples, when the external low-voltage power supply of the motor controller is normal, the output of the low-voltage battery supplies power to the lower bridge drive power supply through the first diode and the lower bridge drive power switch module, and the output of the DC-DC converter supplies power to the lower bridge drive power supply through the second diode and the lower bridge drive power switch module.

[0011] In the above implementation process, the lower bridge drive power supply of the motor controller has two sources: one is the power supply from the low-voltage KL30, and the other is the output of the DC-DC converter. These two sources supply power to the lower bridge drive power supply of the motor controller through diode mutual offset. In this way, based on the first and second diodes, the isolation between the DC-DC power supply and the low-voltage KL30 power supply can be guaranteed.

[0012] Furthermore, in some examples, the lower bridge drive power switch module includes a rising edge trigger; the microprocessor is configured to send a rising edge signal to the rising edge trigger at power-on to enable the rising edge trigger to turn on the lower bridge drive power switch module, and to send a rising edge signal to the rising edge trigger again during normal sleep to disable the lower bridge drive power switch module.

[0013] In the above implementation process, a rising edge trigger is set to enable and disable the lower bridge drive power switch module. At power-on, the MCU sends a rising edge signal to turn on the lower bridge drive power switch module. During normal sleep, the MCU sends a rising edge signal to turn off the lower bridge drive power switch module. In this way, when the system is powered on and a low-voltage system power failure occurs, the lower bridge drive power switch module maintains the output state because there is no rising edge signal, thereby ensuring the normal power supply of the lower bridge drive power.

[0014] Furthermore, in some examples, the lower bridge drive power switch module further includes an NMOS transistor and a PMOS transistor; the gate of the NMOS transistor is connected to the rising edge trigger; the drain of the NMOS transistor is connected to the gate of the PMOS transistor; the source of the NMOS transistor is grounded; the source of the PMOS transistor is connected to the cathode of the first diode and the cathode of the second diode; the drain of the PMOS transistor is connected to the lower bridge drive power supply; the lower bridge drive power switch module further includes a first resistor, a second resistor, and a third resistor; the first resistor is connected to the input terminal of the rising edge trigger; the second resistor and the third resistor are connected in series between the gate and source of the PMOS transistor.

[0015] In the above implementation process, a specific circuit structure for the lower bridge drive power switch module is provided.

[0016] Furthermore, in some examples, the low-voltage battery supplies power to the upper bridge drive power supply of the motor controller via a third diode and an upper bridge power supply switch.

[0017] In the above implementation process, the low-voltage KL30 supplies power to the upper bridge drive power supply through the third diode and the upper bridge power supply switch. Based on the third diode and the upper bridge power supply switch, the isolation between the low-voltage KL30 power supply and the upper bridge power supply and the lower bridge power supply can be guaranteed.

[0018] Furthermore, in some examples, the microprocessor is also used to send a first active short-circuit enable signal to the upper bridge driver chip and the lower bridge driver chip of the motor controller according to the state of the high-voltage power domain controller, so that the upper bridge driver chip and the lower bridge driver chip control the switching of each power switch in the three-phase inverter of the motor controller according to the first active short-circuit enable signal.

[0019] In the above implementation process, the MCU detects the status of the high-voltage power domain controller. When the high-voltage power domain controller malfunctions, the MCU sends the first active short-circuit enable signal to the upper and lower bridge drive chips of the motor controller, thereby controlling the switching status of the power switching transistors in the three-phase inverter, so that the motor controller enters ASC mode and realizes fault protection.

[0020] Furthermore, in some examples, the ASC logic processing circuit is used to send a second active short-circuit enable signal to the upper bridge driver chip and the lower bridge driver chip of the motor controller according to the state of the microprocessor, so that the upper bridge driver chip and the lower bridge driver chip control the switching of each power switch in the three-phase inverter of the motor controller according to the second active short-circuit enable signal.

[0021] In the above implementation process, when the MCU fails to work normally due to the abnormal power supply of the low-voltage KL30, the ASC logic processing circuit provides a second active short-circuit enable signal to the driver chip according to the MCU's state, so as to control the switching of the IGBT module or the SIC module, enabling the motor controller to enter the ASC mode and realize fault protection.

[0022] Secondly, this application provides a vehicle that includes a high-voltage power domain controller as described in any of the first aspects.

[0023] Other features and advantages disclosed in this application will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described technology disclosed in this application.

[0024] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] 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. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of a high-voltage power domain controller provided in an embodiment of this application; Figure 2 This is a schematic diagram of a drive power supply architecture that meets the ASIL D functional safety requirements of a motor controller, as provided in an embodiment of this application.

[0027] Among them, 11-low-voltage battery; 12-DC converter; 13-motor controller; 131-microprocessor; 132-lower bridge drive power supply; 133-lower bridge drive chip; 134-ASC logic processing circuit; 135-SBC power module; 136-upper bridge drive power supply; 137-upper bridge drive chip; 138-three-phase inverter; 139-IGBT module; 14-lower voltage power supply switch module; 141-Oring switch; 142-PMOS switch; 15-lower bridge drive power supply switch module; 151-rising edge trigger; 152-first resistor; 153-second resistor; 154-third resistor; 155-NMOS transistor; 156-PMOS transistor; 16-motor; 17-first diode; 18-second diode; 19-third diode; 20-upper bridge power supply switch. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0029] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] The current power architecture of automotive motor controllers primarily consists of a DC-DC converter and a low-voltage battery connected in parallel to power the low-voltage system of the motor controller. The DC-DC converter charges the low-voltage battery when it is depleted. This low-voltage power supply system has a significant drawback: when external anomalies such as short circuits or short wires occur in the KL30 network, or when connectors to the motor controller experience connection problems, or when the low-voltage power network within the motor controller experiences short circuits, the entire low-voltage system of the motor controller malfunctions and cannot operate normally. This prevents the motor controller from entering the safe state of active short circuit in the motor's three-phase windings. In this situation, the motor operates at high speed, and the back electromotive force of the motor can damage the motor controller. Therefore, to prevent low-voltage power supply system anomalies from preventing the motor controller from entering the safe state of active short circuit, current motor controllers are typically equipped with a high-voltage backup power supply. This high-voltage backup power supply powers the lower bridge driver chip and ASC (Active Short Circuit) logic processing circuit of the motor controller when the low-voltage power supply system is abnormal. However, the high-voltage backup power supply does not participate in the operation of the controller most of the time, which leads to a lot of waste and can easily cause the system failure rate to increase.

[0031] To address the aforementioned issues, this application provides a high-voltage power domain controller. In this controller, the output of the DC-DC converter supplies power to the lower-bridge drive power supply of the motor controller via a lower-bridge drive power supply switching module, serving as a backup for the low-voltage KL30 power supply. The low-voltage battery and the DC-DC converter are connected via a low-voltage power supply switching module. When an overload or short circuit occurs in the low-voltage power supply of the vehicle's low-voltage system via the KL30, the low-voltage power supply switching module can actively disconnect the output of this DC-DC converter, ensuring that the DC-DC converter can still supply power to the lower-bridge drive power supply. This allows the lower-bridge drive power supply to continue operating, powering the lower-bridge drive chip and ASC logic processing circuit, thereby enabling the motor controller to enter ASC mode and achieve fault protection. Thus, a high-voltage backup power supply is unnecessary, reducing costs and system failure rates.

[0032] The embodiments of this application will be described below: Figure 1 This is a schematic diagram of a high-voltage power domain controller provided in an embodiment of this application, as shown below. Figure 1As shown, the high-voltage power domain controller includes a low-voltage battery 11, a DC-DC converter 12, a motor controller 13, a low-voltage power supply switch module 14, and a lower-bridge drive power switch module 15. The low-voltage power supply switch module 14 is connected between the low-voltage battery 11 and the DC-DC converter 12, and is used to control the connection state between the low-voltage battery 11 and the DC-DC converter 12. The output terminal of the low-voltage battery 11 is connected to the lower-bridge drive power switch module 15. One end of the lower-bridge drive power switch module 15 is connected between the DC-DC converter 12 and the low-voltage power supply switch module 14, and the other end is connected to the motor controller 13. The lower bridge drive power supply 132 of the motor controller 13 is used to power the lower bridge drive chip 133 and the ASC logic processing circuit 134 of the motor controller 13. The microprocessor 131 of the motor controller 13 is used to control the low-voltage power supply switch module 14 to close when the external low-voltage power supply of the motor controller 13 is normal, so that the low-voltage battery 11 and the DC-DC converter 12 jointly supply power to the lower bridge drive power supply 132, and to control the low-voltage power supply switch module 14 to open when the external low-voltage power supply of the motor controller 13 is abnormal, so that the DC-DC converter 12 supplies power to the lower bridge drive power supply 132 alone.

[0033] The aforementioned high-voltage power domain controller is a type of power domain controller, which is an intelligent powertrain management unit. In this high-voltage power domain controller, a DC-DC converter (hereinafter referred to as DCDC) is integrated inside the motor controller. The DCDC converts the high-voltage DC power output from the power battery pack into stable low-voltage DC power; this low-voltage DC power is the output of the DCDC. The DCDC and the low-voltage battery are connected through a low-voltage power supply switch module. When the low-voltage switch module is closed, the outputs of the low-voltage battery and the DCDC are connected in parallel to generate the low-voltage power supply KL30. This low-voltage KL30 supplies power to the power module, driver chip, and ASCII logic processing circuit of the motor controller. Unlike related technologies, in the high-voltage power domain controller provided in this embodiment, the DCDC is connected to the lower-bridge drive power supply of the motor controller through a lower-bridge drive power supply switch module. When the lower-bridge drive power supply switch module is closed, the output of the DCDC supplies power to the lower-bridge drive power supply, serving as a backup for the power supply of the low-voltage KL30. Thus, when the external low-voltage power supply to the motor controller is normal, the output of the DC-DC converter in the low-voltage KL30 can be actively cut off by disconnecting the low-voltage switch module, ensuring that the DC-DC converter can still work normally. At this time, the lower bridge drive power supply switch module remains closed, and the output of the DC-DC converter continues to supply power to the lower bridge drive power supply, so that the lower bridge drive power supply can continue to supply power to the lower bridge drive chip and the ASC logic processing circuit, thereby enabling the motor controller to enter a safe state.

[0034] In some embodiments, the low-voltage power supply switching module can be the PMOS switch of the DC-DC converter. That is, the high-voltage power domain controller can reuse the PMOS switch of the DC-DC converter to actively disconnect the output of this DC-DC converter after an overload or short circuit occurs in the low-voltage KL30 power supply line of the vehicle's low-voltage system, ensuring that the DC-DC converter can still operate normally to supply power to other low-voltage systems not powered by KL30. The PMOS (Positive Channel Metal Oxide Semiconductor) switch here is a built-in switching device in the DC-DC converter; reusing the PMOS switch of the DC-DC converter can effectively reduce costs.

[0035] Furthermore, in some embodiments, the low-voltage power supply switching module may also include an Oring switch for the DC-DC converter; the Oring switch is used to prevent the current from the low-voltage battery from flowing back into the DC-DC converter when a short circuit occurs inside the DC-DC converter. That is, the high-voltage power domain controller can reuse the Oring switch of the DC-DC converter in the low-voltage power supply switching module. An Oring switch, also known as an Oring controller or ideal diode controller, is an electronic circuit that manages power by controlling power switching devices. Currently, most DC-DC converters integrate an Oring switch. In DC-DC converters, the core function of the Oring switch is to achieve redundancy backup of multiple power supplies and to prevent internal current leakage caused by differences in output voltage between different power supplies. In this embodiment, by reusing the Oring switch of the DC-DC converter, it is possible to prevent the current from the low-voltage battery from flowing back into the DC-DC converter when a short circuit occurs inside the DC-DC converter, thus preventing abnormal power supply to other network components in the vehicle powered by the low-voltage KL30.

[0036] In some embodiments, when the external low-voltage power supply to the motor controller is normal, the output of the low-voltage battery supplies power to the lower-bridge drive power supply via a first diode and the lower-bridge drive power supply switching module, and the output of the DC-DC converter supplies power to the lower-bridge drive power supply via a second diode and the lower-bridge drive power supply switching module. That is, the lower-bridge drive power supply of the motor controller has two power sources: one from the low-voltage KL30 and the other from the output of the DC-DC converter. These two sources supply power to the lower-bridge drive power supply of the motor controller after being mutually offset by diodes. Thus, based on the first and second diodes, isolation between the DC-DC power supply and the low-voltage KL30 power supply can be ensured.

[0037] In some embodiments, the lower bridge drive power switch module includes a rising edge trigger; the microprocessor is configured to send a rising edge signal to the rising edge trigger at power-on time to enable the rising edge trigger to turn on the lower bridge drive power switch module, and to send a rising edge signal to the rising edge trigger again during normal sleep to enable the rising edge trigger to turn off the lower bridge drive power switch module. In other words, the high-voltage power domain controller enables and disables the lower bridge drive power switch module via a rising edge trigger. When the low-voltage KL30 power supply is abnormal, the low-voltage system, including the SBC (System Basis Chip) and MCU (Micro Controller Unit), cannot function properly. If the MCU's level is used to enable the lower bridge drive power switch module, it will disconnect when the MCU is not powered and cannot maintain the level state, failing to meet the requirements. Therefore, a rising edge trigger is used to enable and disable the lower bridge drive power switch module. At power-on, the MCU sends a rising edge signal to turn on the lower bridge drive power switch module. During normal sleep, the MCU sends a rising edge signal to turn off the lower bridge drive power switch module. In this way, when the low-voltage system loses power after the system is powered on, the lower bridge drive power switch module maintains its output state due to the absence of a rising edge signal, ensuring the normal power supply of the lower bridge drive power.

[0038] Furthermore, in some embodiments, the lower bridge drive power switch module further includes an NMOS transistor and a PMOS transistor; the gate of the NMOS transistor is connected to the rising edge trigger; the drain of the NMOS transistor is connected to the gate of the PMOS transistor; the source of the NMOS transistor is grounded; the source of the PMOS transistor is connected to the cathode of the first diode and the cathode of the second diode; the drain of the PMOS transistor is connected to the lower bridge drive power supply; the lower bridge drive power switch module further includes a first resistor, a second resistor, and a third resistor; the first resistor is connected to the input terminal of the rising edge trigger; the second resistor and the third resistor are connected in series between the gate and source of the PMOS transistor. In other words, the lower bridge drive power switch module, in addition to the rising edge trigger, also includes NMOS transistors, PMOS transistors, a first resistor, a second resistor, and a third resistor. When the MCU sends a rising edge signal, the rising edge trigger outputs a high level, the gate voltage of the NMOS transistor rises, the NMOS transistor turns on, pulling the gate voltage of the PMOS transistor low. The source and drain of the PMOS transistor then conduct, and the output of the low-voltage KL30 and the DC-DC converter supplies power to the lower bridge drive power supply through the PMOS transistor. The first resistor limits the input current of the rising edge trigger to prevent overcurrent, while the second and third resistors form a voltage divider network to stabilize the PMOS gate voltage.

[0039] In some embodiments, the low-voltage battery supplies power to the upper bridge drive power supply of the motor controller via a third diode and an upper bridge power supply switch. That is, the low-voltage KL30 power supply supplies power to the upper bridge drive power supply via the third diode and the upper bridge power supply switch. Based on this third diode and the upper bridge power supply switch, isolation between the low-voltage KL30 power supply and the upper bridge power supply and the lower bridge power supply can be ensured.

[0040] In some embodiments, the microprocessor is further configured to send a first active short-circuit enable signal to the upper and lower bridge driver chips of the motor controller based on the state of the high-voltage power domain controller, so that the upper and lower bridge driver chips control the switching of each power switch in the three-phase inverter of the motor controller according to the first active short-circuit enable signal. That is, the MCU detects the state of the high-voltage power domain controller, and when the high-voltage power domain controller malfunctions, the MCU sends a first active short-circuit enable signal to the upper and lower bridge driver chips of the motor controller, thereby controlling the switching state of the power switches in the three-phase inverter, such as IGBTs (Insulated-Gate Bipolar Transistors) or SiC (Silicon Carbide) switches, causing the motor controller to enter ASC mode and achieve fault protection.

[0041] Furthermore, in some embodiments, the ASC logic processing circuit is used to send a second active short-circuit enable signal to the upper bridge driver chip and the lower bridge driver chip of the motor controller according to the state of the microprocessor. This enables the upper bridge driver chip and the lower bridge driver chip to control the switching of each power switch transistor in the three-phase inverter of the motor controller based on the second active short-circuit enable signal. In other words, when the MCU cannot operate normally due to a low-voltage KL30 power supply abnormality, the ASC logic processing circuit provides a second active short-circuit enable signal to the driver chip according to the MCU's state to control the switching of the IGBT module or SiC module, allowing the motor controller to enter ASC mode and achieve fault protection.

[0042] This application provides a high-voltage power domain controller. In this controller, the output of the DC-DC converter supplies power to the lower-bridge drive power supply of the motor controller via a lower-bridge drive power switch module, serving as a backup for the low-voltage KL30 power supply. The low-voltage battery and the DC-DC converter are connected via the low-voltage power supply switch module. When the low-voltage KL30 power supply to the vehicle's low-voltage system experiences an overload or short circuit, the low-voltage power supply switch module can actively disconnect the output of this DC-DC converter, ensuring that the DC-DC converter can still normally supply power to the lower-bridge drive chip and ASC logic processing circuit. This allows the motor controller to enter a safe state of three-phase active short circuit. Thus, using the output of the DC-DC converter at the front end of the low-voltage power supply switch module to power part of the motor controller system, replacing the high-voltage backup power supply in special fault modes, effectively reduces costs and system failure rates.

[0043] To provide a more detailed explanation of the solution in this application, a specific embodiment is described below: This embodiment provides a drive power supply architecture that meets the ASIL D functional safety requirements of a motor controller. ASIL D, or Automotive Safety Integrity Level D, is the highest automotive safety integrity level defined in the ISO 26262 standard. The drive power supply architecture is as follows: Figure 2 As shown, the system includes a low-voltage battery 11, a DC-DC converter 12, a motor controller 13, a low-voltage power supply switch module 14, and a lower-bridge drive power supply switch module 15. The motor controller 13 includes a microprocessor 131, a lower-bridge drive power supply 132, a lower-bridge drive chip 133, an ASC logic processing circuit 134, an SBC power module 135, an upper-bridge drive power supply 136, an upper-bridge drive chip 137, and a three-phase inverter 138. The three-phase inverter 138 consists of six IGBT modules 139, and its output is connected to the motor 16. The low-voltage power supply switch module 14 includes an oring switch 141 and a PMOS switch 142, which can be integrated within the DC-DC converter 12. The lower-bridge drive power supply switch module 15 includes a rising-edge trigger 151, a first resistor 152, a second resistor 153, a third resistor 154, an NMOS transistor 155, and a PMOS transistor 156.

[0044] In this drive power supply architecture, when the Oring switch 141 and the PMOS switch 142 are turned on, the outputs of the low-voltage battery 11 and the DC-DC converter 12 are connected in parallel to generate the power supply for the low-voltage KL30. The output of the DC-DC converter 12 supplies power to the lower-bridge drive power supply 132 through the lower-bridge drive power supply switching module 15. At the same time, the power supply for the lower-bridge drive power supply 132 also comes from the power supply of the low-voltage KL30. The two power supplies are connected through the first diode 17 and the second diode 18 and then supplied to the lower-bridge drive power supply 132. The lower-bridge drive power supply 132 is responsible for supplying power to the ASCII logic processing circuit 134 and the lower-bridge drive chip 133.

[0045] The low-voltage KL30 supplies power to the low-voltage system via the third diode 19. The SBC power module 135 of the low-voltage system supplies power to the various circuit modules on the low-voltage side of the motor controller 13. The microprocessor 131 is responsible for issuing control commands to the upper-bridge driver chip 137 and the lower-bridge driver chip 133. The upper-bridge driver chip 137 and the lower-bridge driver chip 136 are responsible for controlling the on and off of the IGBT module. The low-voltage KL30 supplies power to the upper-bridge driver power supply 136 via the third diode 19 and then via the upper-bridge power supply switch 20. The upper-bridge driver power supply 136 supplies power to the upper-bridge driver chip 137.

[0046] To achieve fault protection, the microprocessor 131 sends a first active short-circuit enable signal to the lower bridge driver chip 133 based on the state of the motor controller 13, forming ASC path 1, so that the motor controller 13 enters the safe state of three-phase active short circuit. The ASC logic processing circuit 134 sends a second active short-circuit enable signal to the lower bridge driver chip 133 based on the states of the microprocessor 131 and the motor controller 13, forming ASC path 2, so that the motor controller 13 enters the safe state of three-phase active short circuit.

[0047] Unlike related technologies, the drive power architecture provided in this embodiment eliminates the need for a high-voltage backup power supply. The output of the DC-DC converter 12 before the Oring switch 141 is connected within the domain controller and then transferred to the motor controller 13 to power the lower bridge drive power supply 132. This power supply is a backup to the low-voltage KL30 power supply. If any one of the power supplies fails, the other power supply will power the lower bridge drive power supply 132, allowing the lower bridge drive power supply 132 to continue operating and powering the ASC logic processing circuit 134 and the lower bridge drive chip 133. This enables the motor controller 13 to enter a safe state of three-phase active short circuit, achieving fault protection.

[0048] In addition, an Oring switch 141 and a PMOS switch 142 are added to the output of the DC-DC converter 12. The Oring switch 141 prevents a short circuit inside the DC-DC converter 12 from causing current from the low-voltage battery 11 to flow back into the DC-DC converter 12 and disrupt the power supply to other networks in the vehicle powered by the low-voltage KL30. The PMOS switch 142 actively disconnects the output of the DC-DC converter 12 in the event of an overload or short circuit in the low-voltage KL30 power supply, ensuring that the DC-DC converter 12 can still operate normally to supply power to other low-voltage systems not powered by the low-voltage KL30. These two switches ensure the higher level of functional safety requirements of the vehicle's low-voltage system, meeting the growing demands for intelligent driving safety.

[0049] Furthermore, a lower bridge drive power switch module 15 is set before power supply. This lower bridge drive power switch module 15 ensures that the microprocessor 131 is enabled to drive the power supply when it is powered on and also needs to be enabled to shut down when it is powered off. Therefore, when the low voltage KL30 fails to power down and causes the microprocessor 131 to malfunction, the lower bridge drive power switch module 15 will not be able to be shut down, thus ensuring that the lower bridge continues to be powered after the low voltage KL30 fails to power down.

[0050] Under the new drive power architecture composed of the above key components and functions, the microprocessor 131 simultaneously collects and monitors the voltage of the low-voltage power supply KL30 and the network voltage before the Oring switch 141, so that the motor controller 13 can achieve the safety level ASIL D of motor controller torque safety without the need for high-voltage power supply.

[0051] This application also provides a vehicle that includes the high-voltage power domain controller described in any of the above embodiments.

[0052] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0053] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A high-voltage power domain controller, characterized in that, The system includes a low-voltage battery, a DC-DC converter, a motor controller, a low-voltage power supply switch module, and a lower-bridge drive power supply switch module. The low-voltage power supply switch module is connected between the low-voltage battery and the DC-DC converter, controlling the connection between them. The output terminal of the low-voltage battery is connected to the lower-bridge drive power supply switch module. One end of the lower-bridge drive power supply switch module is connected between the DC-DC converter and the low-voltage power supply switch module, and the other end is connected to the lower-bridge drive power supply of the motor controller. The lower-bridge drive power supply powers the lower-bridge drive chip and ASC logic processing circuit of the motor controller. The microprocessor of the motor controller controls the low-voltage power supply switch module to close when the external low-voltage power supply to the motor controller is normal, so that the low-voltage battery and the DC-DC converter jointly power the lower-bridge drive power supply; and controls the low-voltage power supply switch module to open when the external low-voltage power supply to the motor controller is abnormal, so that the DC-DC converter powers the lower-bridge drive power supply alone.

2. The high-voltage power domain controller according to claim 1, characterized in that, The low-voltage power supply switching module includes the PMOS switch of the DC-DC converter.

3. The high-voltage power domain controller according to claim 2, characterized in that, The low-voltage power supply switch module also includes an Oring switch for the DC converter; the Oring switch is used to prevent the current from the low-voltage battery from flowing back into the DC converter when a short circuit occurs inside the DC converter.

4. The high-voltage power domain controller according to claim 1, characterized in that, When the external low-voltage power supply of the motor controller is normal, the output of the low-voltage battery supplies power to the lower bridge drive power supply through the first diode and the lower bridge drive power switch module, and the output of the DC converter supplies power to the lower bridge drive power supply through the second diode and the lower bridge drive power switch module.

5. The high-voltage power domain controller according to claim 4, characterized in that, The lower bridge drive power switch module includes a rising edge trigger; the microprocessor is used to send a rising edge signal to the rising edge trigger at power-on time to make the rising edge trigger turn on the lower bridge drive power switch module, and to send a rising edge signal to the rising edge trigger again during normal sleep to make the rising edge trigger turn off the lower bridge drive power switch module.

6. The high-voltage power domain controller according to claim 5, characterized in that, The lower bridge drive power switch module further includes an NMOS transistor and a PMOS transistor; the gate of the NMOS transistor is connected to the rising edge trigger; the drain of the NMOS transistor is connected to the gate of the PMOS transistor; the source of the NMOS transistor is grounded; the source of the PMOS transistor is connected to the cathode of the first diode and the cathode of the second diode; the drain of the PMOS transistor is connected to the lower bridge drive power supply. The lower bridge drive power switch module further includes a first resistor, a second resistor, and a third resistor; the first resistor is connected to the input terminal of the rising edge trigger; the second resistor and the third resistor are connected in series between the gate and source of the PMOS transistor.

7. The high-voltage power domain controller according to claim 1, characterized in that, The low-voltage battery supplies power to the upper bridge drive power supply of the motor controller via a third diode and an upper bridge power supply switch.

8. The high-voltage power domain controller according to claim 1, characterized in that, The microprocessor is also configured to send a first active short-circuit enable signal to the upper bridge driver chip and the lower bridge driver chip of the motor controller according to the state of the high-voltage power domain controller, so that the upper bridge driver chip and the lower bridge driver chip control the switching of each power switch in the three-phase inverter of the motor controller according to the first active short-circuit enable signal.

9. The high-voltage power domain controller according to claim 8, characterized in that, The ASC logic processing circuit is used to send a second active short-circuit enable signal to the upper bridge driver chip and the lower bridge driver chip of the motor controller according to the state of the microprocessor, so that the upper bridge driver chip and the lower bridge driver chip control the switching of each power switch in the three-phase inverter of the motor controller according to the second active short-circuit enable signal.

10. A vehicle, characterized in that, The vehicle includes a high-voltage power domain controller as described in any one of claims 1 to 9.

Images