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

Abstract

The application discloses a kind of stable control circuit of controller power supply voltage, electronic equipment and vehicle.Controlled by first power supply line, the positive pole of vehicle battery is connected to the first end of ESC controller, for power supply to motor;The positive pole of vehicle battery is connected to the second end of ESC controller by second power supply line, for power supply to small current load;Current return path is arranged between the first power supply line and the second power supply line, and the current return path is used to communicate 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 closed.The application provides freewheeling path for motor power supply line, and solves the problem of large voltage oscillation from the source.At the same time, electrolytic capacitor of motor power supply path is reduced or cancelled, and space is not needed for electrolytic capacitor of motor, so as to reduce development cost.

Description

Technical Field

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

[0002] The Electronic Stability Control (ESC) system includes active safety features such as ABS (Anti-lock Braking System), TCS (Traction Control System), and AYC (Active Yaw Control). It controls the pressure increase, decrease, and pressure maintenance at the wheels by driving the motor and solenoid valve coils to maintain vehicle stability. The motor in the ESC system is typically a brushed motor with a rated power greater than 200W and a starting current greater than 90A. To reduce operating noise and improve NVH (Noise, Vibration, and Harshness) performance, PWM (Pulse Width Modulation) control is typically used. During motor startup or heavy load operation, the motor current is high. Because PWM control is used, when the PWM level is low, the motor power supply is shut off, causing the power supply line current to drop suddenly to "0A." Due to parasitic inductance in the power supply line, this sudden current change can cause a sudden voltage change, resulting in large voltage fluctuations. 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 controller, but they still have the following shortcomings: (1) The root cause of the voltage oscillation is not cut off. When the motor current continues to increase, the power supply port will still produce oscillations, and the EMC (Electromagnetic Compatibility) problem is still prominent; (2) The electrolytic capacitor occupies 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 the electrolytic capacitor 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 in the prior art that the source of voltage oscillation cannot be cut off.

[0005] According to a first aspect of the present invention, there is provided a controller power supply voltage stabilization control circuit, comprising:

[0006] The positive electrode of the vehicle battery is connected to the first end of the ESC controller through a first power supply line for supplying power to the motor;

[0007] The positive electrode of the vehicle battery is connected to the second terminal of the ESC controller through a second power supply line for supplying power to a low current load;

[0008] 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.

[0009] Optionally, the current return path includes a switch device and a control module;

[0010] Two ends of the switch device are respectively connected to the first power supply line and the second power supply line, and the control module is connected to the switch device;

[0011] The control module is used to control the switch device to be turned on when the high-side switch MOS of the motor is turned off, and the control module is used to control the switch device to be turned off when the high-side switch MOS of the motor is turned on.

[0012] Optionally, the switching device includes a first transistor and a second transistor;

[0013] 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.

[0014] Optionally, the first transistor and the second transistor are NMOS transistors.

[0015] 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 a high-side switch MOS control signal of the motor, the output end of the first inverter is connected to the first end of the 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.

[0016] Optionally, the current return path also 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.

[0017] 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.

[0018] Optionally, it also 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.

[0019] According to a second aspect of the present invention, an electronic device is provided, comprising the controller power supply voltage stabilization control circuit according to the first aspect of the present invention.

[0020] According to a third aspect of the present invention, a vehicle is provided, comprising the electronic device according to the second aspect of the present invention.

[0021] The present invention provides a freewheeling path for the motor power supply circuit, fundamentally resolving the problem of large voltage fluctuations. It also reduces or eliminates the need for electrolytic capacitors in the motor power supply circuit, improving PCB layout space utilization. Furthermore, the connector, housing, or cover can be designed in a standard manner, eliminating the need to reserve space for the motor's electrolytic capacitors and reducing development costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a solution for reducing voltage fluctuations using electrolytic capacitors in the prior art.

[0023] Figure 2 This is a schematic diagram of the solution for connecting two power supply lines in the ESC system.

[0024] Figure 3 Schematic diagram of a controller power supply voltage stabilization control circuit according to an embodiment of the present invention.

[0025] Figure 4 2 is a schematic diagram of a return path in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0027] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0028] Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0029] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0030] In the present description, references to features referred to as "first" or "second" may explicitly or implicitly include one or more of these features. In the present description, unless otherwise specified, "plurality" means two or more. Furthermore, the term "and / or" in this specification refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0031] like Figure 1 As shown in the figure, KL30_1 is the positive power input port of the controller, and GND1 is the negative power input port of the controller. When the motor's high-side MOS (Metal-Oxide-Semiconductor) is turned off, the current on the power supply line suddenly drops to 0. Due to the inductance in the power supply line, according to V=L*di / dt, KL30_1 has a momentary high voltage. In addition, there are parasitic parameters in the controller and power supply lines, so the KL30_1 voltage will continue to oscillate. Increasing the filter capacitor can reduce the amplitude and frequency of the KL30_1 voltage oscillation, thereby reducing interference inside the controller.

[0032] In the ESC system, there are two power supply lines and two return ground lines. The wiring is as follows: Figure 2As shown in the figure, the positive terminal of the vehicle battery sends two power lines, KL30_1 and KL30_2, to the controller, powering the motor and low-current loads, respectively. The negative terminal of the vehicle battery sends two power lines, GND1 and GND2, to the controller. GND1 and GND2 are short-circuited inside the controller, and the ESC system uses a near-end grounding method on the vehicle (thick, short lines with minimal inductance). The primary source of voltage fluctuations is the motor power line, specifically the KL30_1 line.

[0033] This embodiment introduces a controller power supply voltage stabilization control circuit, including:

[0034] The positive electrode of the vehicle battery is connected to the first end of the ESC controller through a first power supply line for supplying power to the motor;

[0035] The positive electrode of the vehicle battery is connected to the second terminal of the ESC controller through a second power supply line for supplying power to a low current load;

[0036] 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.

[0037] like Figure 3 As shown in the figure, during the PWM control process, the motor high-side switch MOS will cause a sudden change in current on the KL30_1 power supply line, thereby generating voltage oscillation. The greater the motor load or during the motor startup process, the more obvious the voltage oscillation is. Therefore, it is necessary to provide a current return path for the equivalent inductance on the KL30_1 power supply line after the motor high-side switch MOS is turned off to reduce the current sudden change on the KL30_1 power supply line and the voltage oscillation at the KL30_1 port.

[0038] Figure 3 In the figure, a current return path is added between KL30_1 and KL30_2. After the motor high-side switch MOS is turned off, the current in the KL30_1 power supply line "continues" in the direction of the arrow. The current in the KL30_1 power supply line changes slowly and there is no current mutation. Therefore, the KL30_1 voltage fluctuation is small, cutting off the source of voltage fluctuation.

[0039] This invention provides a freewheeling path for the motor power supply circuit, solving the problem of large voltage fluctuations at the source. It also reduces or eliminates the need for electrolytic capacitors in the motor power supply path, improving PCB layout space utilization. Furthermore, connectors, housings, or covers can be designed in a standard manner, eliminating the need to reserve space for the motor's electrolytic capacitors and reducing development costs.

[0040] In this embodiment, the current return path includes a switch device and a control module;

[0041] Two ends of the switch device are respectively connected to the first power supply line and the second power supply line, and the control module is connected to the switch device;

[0042] The control module is used to control the switch device to be turned on when the high-side switch MOS of the motor is turned off, and the control module is used to control the switch device to be turned off when the high-side switch MOS of the motor is turned on.

[0043] Specifically, the switching device includes a first transistor and a second transistor;

[0044] 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.

[0045] The first transistor and the second transistor are NMOS (N-Metal-Oxide-Semiconductor) transistors. Figure 4 As shown, the first transistor is NMOS1 and the second transistor is NMOS2.

[0046] The purpose of setting up a current return path is to connect KL30_1 and KL30_2 on the controller side and disconnect them when the motor's high-side MOSFET is on. Therefore, KL30_1 and KL30_2 can be connected or disconnected on the controller side using switches with different conduction states. A corresponding control module is also included to control the switches based on the state of the motor's high-side MOSFET.

[0047] In this embodiment, the control module includes a first inverter, the input end of the first inverter is connected to a PWM signal, the PWM signal is a high-side switch MOS control signal of the motor, the output end of the first inverter is connected to the first end of the 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.

[0048] According to the operating principle of the current return path, the conduction states of the two transistors in the current return path are opposite to those of the motor's high-side MOS switch. To reduce the number of additional control signals, the two transistors in the current return path are also controlled using a PWM signal. This PWM signal also controls the motor's high-side MOS switch. Because the two conduction states are opposite, an inverter is added to the current return path. This inverter allows the same PWM signal to simultaneously control the transistors in the current return path and the motor's high-side MOS switch.

[0049] like Figure 4 As shown in the figure, when the PWM signal level is high, the gate voltage of the motor's high-side switch MOS is high, while the gate voltage of NMOS1 and NMOS2 is low due to the action of the inverter, and the motor is powered. When the PWM signal level is low, the gate voltage of NMOS1 and NMOS2 is high, and both are turned on. KL30_1 and KL30_2 are connected at the controller end, providing a "freewheeling path" for the current in KL30_1's power supply line. The current in KL30_1's power supply line changes slowly, resulting in small fluctuations in KL30_1's power supply voltage.

[0050] In this embodiment, the current return path also includes a pre-driver, the input end of the pre-driver is connected to the control signal of the MCU, and the output end of the pre-driver is respectively connected to the gate of the first transistor and the gate of 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.

[0051] like Figure 4 As shown, the MCU can drive NMOS1 and NMOS2 by controlling the pre-driver, so that the power supplies of KL30_1 and KL30_2 can back up each other and realize power redundancy.

[0052] This embodiment introduces a motor drive circuit, wherein a first terminal of the ESC controller is connected to the drain of the high-side switch MOS of the motor, a source of the high-side switch MOS of the motor is connected to the first terminal of the motor, a gate of the high-side switch MOS of the motor is connected to the PWM signal, and a second terminal of the motor is grounded via a third transistor.

[0053] Specifically, it also 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.

[0054] The third transistor is an anti-reverse MOS, mainly used to prevent reverse connection. The fourth transistor is a freewheeling MOS. Figure 3 As shown, the anti-reverse MOS is connected to the ground terminals GND1 and GND2. GND1 and GND2 are connected to the negative terminal of the vehicle battery.

[0055] In addition, for products with longer GND line paths, you can refer to the solutions of KL30_1 and KL30_2 and perform the same processing on GND1 and GND2.

[0056] This embodiment introduces an electronic device, including a controller power supply voltage stabilization control circuit as described in any embodiment of the present invention.

[0057] This embodiment introduces a vehicle, including an electronic device described in the above embodiment of the present invention.

[0058] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention.

[0059] Those skilled in the art will appreciate that the modules and algorithm steps described in conjunction with the embodiments disclosed herein can be implemented using electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0060] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and equipment can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0061] In the embodiments provided in this 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 schematic. For example, the division of the modules is merely a logical function division. In actual implementation, there may be other division methods, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0062] The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple network modules. Some or all of these modules may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

[0063] In addition, each functional module in the embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0064] If the functions are implemented in the form of software 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, or the portion that contributes to the prior art, or the portion of the 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 for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes various media that can store program code, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0065] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

[0066] It should be understood that the size of the serial numbers of the steps in the content of the invention and the 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 on the implementation process of the embodiments of the present invention. The foregoing description of the implementation of the present disclosure has been given for the purpose of example and description. The foregoing description is not exhaustive and is not intended to limit the present disclosure to the exact form disclosed. Various variations and modifications may exist based on the above teachings, or various variations and modifications may be obtained from the practice of the present disclosure. These embodiments are selected 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 specific purpose conceived.

Claims

1. A controller power supply voltage stabilization control circuit, characterized in that: include: The positive electrode of the vehicle 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 battery is connected to the second terminal 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; The current return path includes a switch device and a control module; Two ends of the switch device are respectively connected to the first power supply line and the second power supply line, and the control module is connected to the switch device; The control module is used to control the switch device to be turned on when the high-side switch MOS of the motor is turned off, and the control module is used to control the switch device to be turned off when the high-side switch MOS of the motor is turned on; The control module includes a first inverter, an input end of the first inverter is connected to a PWM signal, the PWM signal is a high-side switch MOS control signal of the motor, an output end of the first inverter is connected to a first end of a first resistor, and a second end of the first resistor is connected to a gate of a first transistor and a gate of a second transistor respectively; 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.

2. A controller power supply voltage stabilization control circuit according to claim 1, 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.

3. The controller power supply voltage stabilization control circuit according to claim 2, characterized in that: The first transistor and the second transistor are NMOS transistors.

4. The controller power supply voltage stabilization control circuit according to claim 2, characterized in that: The current return path also 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 achieve power redundancy by controlling the pre-driver to drive the first transistor and the second transistor.

5. The controller power supply voltage stabilization control circuit according to claim 1, characterized in that: It also 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.

6. An electronic device, characterized in that: A controller power supply voltage stabilization control circuit comprising the circuit described in any one of claims 1 to 5.

7. A vehicle, characterized in that: An electronic device comprising the electronic device described in claim 6.

Images