Stable control circuit for power supply voltage of controller, electronic equipment and vehicle

Abstract

The invention discloses a stable control circuit for voltage of a power supply of a controller, electronic equipment and a vehicle. The positive electrode of a vehicle-mounted storage battery is connected to the first end of an ESC controller through a first power supply circuit and used for supplying power to a motor; the positive electrode of the vehicle-mounted storage battery is connected to the second end of the ESC controller through a second power supply line and used for supplying power to the small-current load. A current backflow path is arranged between the first power supply circuit and the second power supply circuit, and the current backflow path is used for enabling the first power supply circuit and the second power supply circuit to be communicated at the ESC controller end after a high-side switch MOS of the motor is closed. According to the invention, a follow current path is provided for a motor power supply line, and the problem of large voltage oscillation is solved from the source. Meanwhile, electrolytic capacitors of a motor power supply path are reduced or cancelled, space does not need to be reserved for the electrolytic capacitors of the motor, and the development cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicles, and in particular relates to a stable control circuit for a controller power supply voltage, an electronic device and a vehicle. Background Art

[0002] The Electronic Stability System (ESC) has active safety functions such as ABS (Anti-lock Braking System), TCS (Traction Control System), and AYC (Active Yaw Control). It drives the motor and solenoid valve coil to increase, reduce, and maintain pressure on the wheels to maintain vehicle stability. The motor type in the ESC system is generally a brushed motor with a rated power greater than 200W and a starting current greater than 90A. In order to reduce the noise when the motor is working and improve the NVH (Noise, Vibration, Harshness) performance, PWM (Pulse Width Modulation) control is usually used to drive the motor. When the motor is started or working under heavy load, the motor current is large. Due to the use of PWM control, when PWM is at a low level, the motor power supply is turned off, and the current of the power supply line suddenly drops to "0A". Due to the parasitic inductance on the power supply line, the sudden change of current will bring about a sudden change of voltage, resulting in large voltage fluctuations on the power supply line. In order to reduce voltage fluctuations, electrolytic capacitors are usually added to the power supply line for filtering.

[0003] The existing technical solutions can reduce the amplitude and frequency of voltage oscillation to a certain extent and reduce the interference to the internal controller, but they still have the following shortcomings: (1) The root cause of voltage oscillation is not cut off. When the motor current continues to increase, the power supply port will still produce oscillation, and the EMC (Electromagnetic Compatibility) problem is still prominent; (2) Electrolytic capacitors occupy a large space, which will increase the challenge of PCB (Printed Circuit Board) layout. At the same time, the connector, housing or cover needs to increase the avoidance space for the capacitor separately, which makes the structural design difficult; (3) The life of electrolytic capacitors is relatively short. Summary of the invention

[0004] An object of the present invention is to provide a controller power supply voltage stabilization control circuit, electronic equipment and vehicle, which can solve the technical problem of not cutting off the source of voltage oscillation in the prior art.

[0005] According to a first aspect of the present invention, there is provided a stable control circuit for the power supply voltage of a controller, comprising: The positive pole of the vehicle-mounted battery is connected to the first end of the ESC controller through a first power supply line for supplying power to the motor; The positive pole of the vehicle-mounted battery is connected to the second end of the ESC controller through a second power supply line for supplying power to a low-current load; A current return path is provided between the first power supply line and the second power supply line, and the current return path is used to connect the first power supply line and the second power supply line at the ESC controller end after the high-side switch MOS of the motor is turned off.

[0006] Optionally, the current return path includes a switching device and a control module; Both ends of the switching device are respectively connected to the first power supply line and the second power supply line, and the control module is connected to the switching device; The control module is used to control the switching device to turn on when the high-side switch MOS of the motor is turned off, and the control module is used to control the switching device to turn off when the high-side switch MOS of the motor is turned on.

[0007] Optionally, the switching device includes a first transistor and a second transistor; The gate of the first transistor and the gate of the second transistor are connected to the control module, the source of the first transistor is connected to the source of the second transistor, the drain of the first transistor is connected to the first power supply line, and the drain of the second transistor is connected to the second power supply line.

[0008] Optionally, the first transistor and the second transistor are NMOS transistors.

[0009] Optionally, the control module includes a first inverter, the input end of the first inverter is connected to a PWM signal, the PWM signal is the control signal of the high-side switch MOS of the motor, the output end of the first inverter is connected to the first end of a first resistor, and the second end of the first resistor is respectively connected to the gate of the first transistor and the gate of the second transistor.

[0010] Optionally, the current return path further includes a pre-driver, the input end of the pre-driver is connected to the control signal of the MCU, the output end of the pre-driver is respectively connected to the gate of the first transistor and the gate of the second transistor, and the MCU is used to drive the first transistor and the second transistor by controlling the pre-driver to achieve power redundancy.

[0011] Optionally, the first end of the ESC controller is connected to the drain of the high-side switch MOS of the motor, the source of the high-side switch MOS of the motor is connected to the first end of the motor, the gate of the high-side switch MOS of the motor is connected to the PWM signal, and the second end of the motor is grounded through a third transistor.

[0012] Optionally, it further includes a second inverter and a fourth transistor. The input end of the second inverter is connected to the PWM signal, the output end of the second inverter is connected to the gate of the fourth transistor, the source of the fourth transistor is connected to the second end of the motor, and the drain of the fourth transistor is connected to the first end of the motor.

[0013] According to a second aspect of the present invention, there is provided an electronic device including a stable control circuit for the power supply voltage of a controller as described in the first aspect of the present invention.

[0014] According to a third aspect of the present invention, there is provided a vehicle including an electronic device as described in the second aspect of the present invention.

[0015] The beneficial effects of the present invention are as follows: The present invention provides a freewheeling path for the motor power supply line, fundamentally solving the problem of large voltage oscillation. At the same time, the electrolytic capacitors in the motor power supply path are reduced or eliminated, improving the space utilization rate of the PCB layout. Meanwhile, the connector, housing, or upper cover can be designed standardly without reserving space for the electrolytic capacitors of the motor, reducing the development cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a prior art solution using electrolytic capacitors to reduce voltage fluctuations.

[0017] Figure 2 is a schematic diagram of a solution for connecting two power supply lines in the ESC system.

[0018] Figure 3 is a schematic diagram of a stable control circuit for the power supply voltage of a controller in an embodiment of the present invention.

[0019] Figure 4 is a schematic diagram of the freewheeling path in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0021] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way limits the present invention, its application, or its use.

[0022] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0023] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof in subsequent figures is not required.

[0024] In the description of the present invention, features related to the terms "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the specification means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0025] As Figure 1 shown, KL30_1 is the positive input port of the controller power supply, and GND1 is the negative input port of the controller power supply. When the high-side MOS (Metal-Oxide-Semiconductor) of the motor is turned off, the current on the power supply line suddenly drops to 0. Due to the presence of inductance on the power supply line, according to V = L * di / dt, there is an instantaneous high voltage at KL30_1, and there are parasitic parameters on the controller line and the power supply line. Therefore, the voltage at KL30_1 will oscillate continuously. By adding a filter capacitor, the amplitude and frequency of the voltage oscillation at KL30_1 can be reduced, thereby reducing the interference to the inside of the controller.

[0026] In the ESC system, there are two power supply lines and two return ground lines, and the wiring method is as Figure 2 shown. The positive terminal of the vehicle-mounted battery power supply is branched into two power supply lines, KL30_1 and KL30_2, to the inside of the controller, respectively supplying power to the motor and the small-current load. The negative terminal of the vehicle-mounted battery is branched into two power supply lines, GND1 and GND2, to the inside of the controller. Inside the controller, GND1 and GND2 are short-circuited, and the ESC system adopts a proximal grounding method at the vehicle end (the line is thick and short, and the inductance characteristic is not obvious). The main source of voltage oscillation is the motor power supply line, that is, the KL30_1 power supply line.

[0027] This embodiment introduces a stable control circuit for the voltage of the controller power supply, including: The positive pole of the vehicle-mounted battery is connected to the first end of the ESC controller through the first power supply line for supplying power to the motor; The positive electrode of the vehicle-mounted battery is connected to the second terminal of the ESC controller through the second power supply line, and is used to supply power to the low-current load; A current return path is provided between the first power supply line and the second power supply line. The current return path is used to connect the first power supply line and the second power supply line at the ESC controller end after the high-side switch MOS of the motor is turned off.

[0028] As Figure 3 shown, during the PWM control process of the high-side switch MOS of the motor, it will cause current mutation on the KL30_1 power supply line, thereby generating voltage oscillation. The larger the motor load or during the motor startup process, the voltage oscillation is particularly obvious. Therefore, after the high-side switch MOS of the motor is turned off, an equivalent inductor on the KL30_1 power supply line needs to be provided with a current return path to reduce the current mutation on the KL30_1 power supply line and reduce the voltage oscillation at the KL30_1 port.

[0029] Figure 3 In, a current return path is added between KL30_1 and KL30_2. After the high-side switch MOS of the motor is turned off, the current on the KL30_1 power supply line "continues to flow" along the arrow direction. The current on the KL30_1 power supply line changes slowly and there is no current mutation. Therefore, the voltage fluctuation of KL30_1 is small, cutting off the source of voltage fluctuation.

[0030] The present invention provides a current continuation path for the motor power supply line, which solves the problem of large voltage oscillation at the source. At the same time, the electrolytic capacitors on the motor power supply path are reduced or eliminated, improving the space utilization rate of the PCB layout. At the same time, the connector or the housing or the upper cover can be designed standardly, without reserving space for the electrolytic capacitor of the motor, reducing the development cost.

[0031] In this embodiment, the current return path includes a switching device and a control module; Both ends of the switching device are respectively connected to the first power supply line and the second power supply line, and the control module is connected to the switching device; The control module is used to control the switching device to turn on when the high-side switch MOS of the motor is turned off, and the control module is used to control the switching device to turn off when the high-side switch MOS of the motor is turned on.

[0032] Specifically, the switching device includes a first transistor and a second transistor; The gates of the first transistor and the second transistor are connected to the control module. The sources of the first transistor and the second transistor are connected. The drain of the first transistor is connected to the first power supply line, and the drain of the second transistor is connected to the second power supply line.

[0033] The first transistor and the second transistor are NMOS (N-Metal-Oxide-Semiconductor) transistors. As Figure 4 shown, the first transistor is NMOS1 and the second transistor is NMOS2.

[0034] The purpose of setting up the current return path is to enable KL30_1 and KL30_2 to be connected at the controller end, and to disconnect KL30_1 and KL30_2 at the controller end when the high-side switch MOS of the motor is turned on. Therefore, the connection or disconnection of KL30_1 and KL30_2 at the controller end can be achieved by switch devices with different conduction states. At the same time, a corresponding control module is added to control the switch device according to the state of the high-side switch MOS of the motor.

[0035] In this embodiment, the control module includes a first inverter. The input end of the first inverter is connected to the PWM signal, which is the control signal for the high-side switch MOS of the motor. The output end of the first inverter is connected to the first end of a first resistor, and the second end of the first resistor is respectively connected to the gates of the first transistor and the second transistor.

[0036] According to the working principle of the current return path, the conduction states of the two transistors in the current return path are opposite to that of the high-side switch MOS of the motor. In order to reduce additional control signals, the two transistors in the current return path are also controlled by the PWM signal, and this PWM signal is also used to control the high-side switch MOS of the motor at the same time. Since their conduction states are opposite, an inverter is added to the current return path, and through the inverter, the transistors in the current return path and the high-side switch MOS of the motor can be controlled simultaneously by the same PWM signal.

[0037] As Figure 4 shown, when the level of the PWM signal is high, the gate voltage of the high-side switch MOS of the motor is high. Under the action of the inverter, the gate voltages of NMOS1 and NMOS2 are low, and at this time the motor is powered on. When the level of the PWM signal is low, the gate voltages of NMOS1 and NMOS2 are high, and both are turned on. KL30_1 and KL30_2 are connected at the controller end, providing a "freewheeling path" for the current on the power supply line of KL30_1. The current on the power supply line of KL30_1 changes slowly, so the power supply voltage fluctuation of KL30_1 is small.

[0038] In this embodiment, the current return path further includes a pre-driver. The input end of the pre-driver is connected to the control signal of the MCU. The output end of the pre-driver is respectively connected to the gates of the first transistor and the second transistor. The MCU is used to drive the first transistor and the second transistor by controlling the pre-driver to achieve power redundancy.

[0039] As Figure 4 shown, the MCU can drive NMOS1 and NMOS2 by controlling the pre-driver to achieve mutual backup of the power supplies of KL30_1 and KL30_2, realizing power redundancy.

[0040] This embodiment introduces a drive circuit of a motor. The first end of the ESC controller is connected to the drain of the high-side switch MOS of the motor. The source of the high-side switch MOS of the motor is connected to the first end of the motor. The gate of the high-side switch MOS of the motor is connected to the PWM signal. The second end of the motor is grounded through a third transistor.

[0041] Specifically, it further includes a second inverter and a fourth transistor. The input end of the second inverter is connected to the PWM signal. The output end of the second inverter is connected to the gate of the fourth transistor. The source of the fourth transistor is connected to the second end of the motor. The drain of the fourth transistor is connected to the first end of the motor.

[0042] The third transistor is an anti-reverse MOS, mainly used to prevent reverse connection. The fourth transistor is a freewheeling MOS. As Figure 3 shown, the anti-reverse MOS is connected to the ground terminals GND1 and GND2. GND1 and GND2 are connected to the negative pole of the vehicle battery.

[0043] In addition, for products with a relatively long GND line path, the same treatment can be performed on GND1 and GND2 by referring to the scheme of KL30_1 and KL30_2.

[0044] This embodiment introduces an electronic device, including a stable control circuit for the power supply voltage of a controller according to any embodiment of the present invention.

[0045] This embodiment introduces a vehicle, including an electronic device according to the above embodiment of the present invention.

[0046] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention.

[0047] Those of ordinary skill in the art will recognize that the modules and algorithm steps described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. A professional technician may use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present invention.

[0048] Those skilled in the art can clearly understand that for the sake of convenience and brevity of description, the specific working processes of the devices and equipment described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0049] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the couplings, direct couplings, or communication connections shown or discussed among each other can be through some interfaces. The indirect couplings or communication connections of the devices or modules can be in electrical, mechanical, or other forms.

[0050] The modules described as separate components may or may not be physically separated. The components shown as modules may or may not be physical modules, that is, they can be located in one place, or they can be distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments of the present invention.

[0051] In addition, the various functional modules in the embodiments of the present invention can be integrated into one processing module, or each module can exist physically alone, or two or more modules can be integrated into one module.

[0052] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical discs that can store program codes.

[0053] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solution formed by mutually replacing the above features with technical features having similar functions (but not limited to) disclosed in the present application.

[0054] It should be understood that the magnitude of the sequence numbers of the steps in the inventive content and embodiments of the present invention does not absolutely mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention. For the purposes of illustration and description, the foregoing description of the implementation of the present disclosure has been given. The foregoing description is not exhaustive nor is it intended to limit the present disclosure to the exact form disclosed, and various variations and modifications are possible in light of the above teachings, or various variations and modifications may be obtained from the practice of the present disclosure. These embodiments are chosen and described in order to illustrate the principles of the present disclosure and its practical application so that those skilled in the art can utilize the present disclosure in various embodiments and various modifications suitable for the particular purposes contemplated.

Claims

1. A stable control circuit for the power supply voltage of a controller, characterized in that, Comprising: The positive electrode of the vehicle-mounted battery is connected to the first end of the ESC controller through a first power supply line for supplying power to the motor. The positive electrode of the vehicle-mounted battery is connected to the second end of the ESC controller through a second power supply line for supplying power to a low-current load. A current return path is provided between the first power supply line and the second power supply line, and the current return path is used to connect the first power supply line and the second power supply line at the ESC controller end after the high-side switch MOS of the motor is turned off.

2. The stable control circuit for the power supply voltage of a controller according to claim 1, characterized in that The current return path includes a switching device and a control module. Two ends of the switching device are respectively connected to the first power supply line and the second power supply line, and the control module is connected to the switching device. The control module is used to control the switching device to turn on when the high-side switch MOS of the motor is turned off, and the control module is used to control the switching device to turn off when the high-side switch MOS of the motor is turned on.

3. The stable control circuit for the power supply voltage of a controller according to claim 2, characterized in that, The switching device includes a first transistor and a second transistor. The gate of the first transistor and the gate of the second transistor are connected to the control module, the source of the first transistor is connected to the source of the second transistor, the drain of the first transistor is connected to the first power supply line, and the drain of the second transistor is connected to the second power supply line.

4. The stable control circuit for the power supply voltage of a controller according to claim 3, characterized in that, The first transistor and the second transistor are NMOS transistors.

5. The stable control circuit for the power supply voltage of a controller according to claim 3, characterized in that, The control module includes a first inverter, the input end of the first inverter is connected to a PWM signal, the PWM signal is the control signal of the high-side switch MOS of the motor, the output end of the first inverter is connected to the first end of a first resistor, and the second end of the first resistor is respectively connected to the gates of the first transistor and the second transistor.

6. The stable control circuit for the power supply voltage of a controller according to claim 3, characterized in that, The current return path further includes a pre-driver, the input end of the pre-driver is connected to the control signal of the MCU, the output end of the pre-driver is respectively connected to the gates of the first transistor and the second transistor, and the MCU is used to drive the first transistor and the second transistor by controlling the pre-driver to achieve power redundancy.

7. The stable control circuit for the power supply voltage of a controller according to claim 4, characterized in that, The first end of the ESC controller is connected to the drain of the high-side switch MOS of the motor, the source of the high-side switch MOS of the motor is connected to the first end of the motor, the gate of the high-side switch MOS of the motor is connected to the PWM signal, and the second end of the motor is grounded through a third transistor.

8. The stable control circuit for the power supply voltage of a controller according to claim 7, wherein It further includes a second inverter and a fourth transistor, the input end of the second inverter is connected to the PWM signal, the output end of the second inverter is connected to the gate of the fourth transistor, the source of the fourth transistor is connected to the second end of the motor, and the drain of the fourth transistor is connected to the first end of the motor.

9. An electronic device, characterized in that, Comprising a stable control circuit for the power supply voltage of a controller according to any one of claims 1 to 8.

10. A vehicle, characterized in that, Comprising an electronic device according to claim 9.

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