A motor drive system based on kjo11n045t

Abstract

The utility model discloses a motor drive system based on KJO11N045T relates to motor drive technical field, including main control module, power drive module and overcurrent protection module, the output of main control module is electrically connected with the input of drive module, power drive module is used for controlling the current and voltage of motor. The utility model discloses a TOLL-8 is adopted to the packaging of MOS tube, and the vertical heat conduction is passed through PCB via, has reduced the circuit thermal resistance, has improved circuit heat dissipation capacity, and the on resistance is small, and the EMI suppression ability is strong, has strengthened the circuit electrical performance, has improved the current carrying capacity.

Description

Technical Field

[0001] This utility model relates to the field of motor drive technology, specifically to a motor drive system based on KJO11N045T. Background Technology

[0002] In existing motor drive technologies, MOSFETs are commonly used as switching elements to control motor operation. Traditional N-channel MOSFETs use the TOP-252 package, which has low packaging cost, making it suitable for cost-sensitive applications. Its packaging technology is mature, the supply chain is stable, and it is easy to procure. It can be used with through-hole or surface mount methods, and the soldering process requirements are relatively low, making it suitable for high-power motor drive circuits.

[0003] Although current motor drive circuits have heat dissipation pads, their actual heat dissipation effect depends on the circuit board design. Complex copper plating and via optimization are required to achieve efficient heat dissipation. Typically, only three electrodes are retained, which limits space utilization. Complex circuit designs rely on external heat dissipation structures, and their applicability is limited. They are mainly suitable for low-to-medium power scenarios (such as smart home appliances and chargers), while high-power scenarios require greater heat dissipation support. Utility Model Content

[0004] To address the aforementioned technical issues, a motor drive system based on KJO11N045T is provided. This technical solution solves the problems mentioned in the background, such as the reliance on circuit board design for heat dissipation, the need for complex copper plating and via optimization to achieve efficient heat dissipation, the typical retention of only three electrodes, limited space utilization, the need for external heat dissipation structures in complex circuit designs, and the limited applicability, mainly suitable for low-to-medium power scenarios (such as smart home appliances and chargers), while high-power scenarios require greater heat dissipation support.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A motor drive system based on KJO11N045T includes a main control module, a power drive module, and an overcurrent protection module. The output terminal of the main control module is electrically connected to the input terminal of the drive module, and the power drive module is used to control the current and voltage of the motor. The main control module is used to generate pulse width modulation signals and transmit them to the power drive module to control the motor speed and torque; The overcurrent protection module includes a current sensor and a current detection circuit, used to detect the motor current and provide an overcurrent protection signal.

[0006] Preferably, the main control module integrates a U3 chip, pin 9 of the U3 chip is electrically connected to the 5V voltage input, pin 7 of the U3 chip is grounded, and a capacitor C12 is electrically connected between pin 9 and pin 7 of the U3 chip.

[0007] Preferably, the power drive module integrates an NMOS transistor QM1, and the first pin of the NMOS transistor QM1 is electrically connected to resistors R19 and R25. Resistor R19 is electrically connected to the 16th pin of the U3 chip. The resistor R25 is a gate-source pull-down resistor, used to determine the level, provide electrostatic discharge protection, limit the drive current, and eliminate oscillation signals; A capacitor C6 is electrically connected to pin 9 of the NMOS transistor QM1.

[0008] Preferably, the overcurrent protection module integrates a sampling resistor RS1, which is electrically connected to a resistor R31. The resistor R31 is electrically connected to pin 14 of the U3 chip, and a capacitor C8 is connected in parallel with the resistor R31. The capacitor C8 is grounded.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention proposes a motor drive system based on KJO11N045T. By using TOLL-8 to package the MOSFET and vertically conducting heat through PCB vias, the thermal resistance of the circuit is reduced, the heat dissipation capacity of the circuit is improved, the on-resistance is low, the EMI suppression capability is strong, the electrical performance of the circuit is enhanced, and the current carrying capacity is improved. Attached Figure Description

[0010] Figure 1 This utility model presents a structural block diagram of a motor drive system based on KJO11N045T. Figure 2 This is the circuit diagram of the main control module in this utility model; Figure 3 This is the circuit diagram of the power drive module in this utility model; Figure 4 This is the circuit diagram of the overcurrent protection module in this utility model. Detailed Implementation

[0011] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0012] Reference Figure 1 - Figure 4 As shown in the figure, a motor drive system based on KJO11N045T in this embodiment of the present invention includes a main control module, a power drive module and an overcurrent protection module. The output terminal of the main control module is electrically connected to the input terminal of the power drive module, and the power drive module is used to control the current and voltage of the motor. The main control module is used to generate pulse width modulation signals and transmit them to the power drive module to control the motor speed and torque; The overcurrent protection module includes a current sensor and a current detection circuit, which is used to detect the motor current and provide an overcurrent protection signal.

[0013] The main control module integrates a U3 chip. Pin 9 of the U3 chip is electrically connected to the 5V voltage input, pin 7 of the U3 chip is grounded, and a capacitor C12 is electrically connected between pin 9 and pin 7 of the U3 chip.

[0014] The power drive module integrates an NMOS transistor QM1. Pin 1 of the NMOS transistor QM1 is electrically connected to resistors R19 and R25. Resistor R19 is electrically connected to pin 16 of the U3 chip. Resistor R25 is a gate-source pull-down resistor used to determine the level, provide electrostatic discharge protection, limit drive current, and eliminate oscillation signals; A capacitor C6 is electrically connected to pin 9 of the NMOS transistor QM1.

[0015] The overcurrent protection module integrates a sampling resistor RS1, which is electrically connected to a resistor R31. Resistor R31 is electrically connected to pin 14 of the U3 chip. Resistor R31 is connected in parallel with a capacitor C8, which is grounded.

[0016] In summary, the advantages of this utility model are as follows: by using TOLL-8 to package the MOSFET and vertically conducting heat through PCB vias, the thermal resistance of the circuit is reduced, the heat dissipation capacity of the circuit is improved, the on-resistance is low, the EMI suppression capability is strong, the electrical performance of the circuit is enhanced, and the current carrying capacity is improved.

[0017] It is important to note that the power drive section uses a KJO11N045T MOSFET as the main switching element. Combined with an appropriate drive circuit, it can efficiently control the motor's current and voltage. The NMOS transistor QM1, capacitor C6, and resistors R19 and R25 together constitute the motor drive module. Resistor R25 is a gate-source pull-down resistor, whose main functions include providing a defined voltage level, electrostatic discharge protection, limiting drive current, and eliminating oscillation signals. The DRM I / O pin connected to the microcontroller is initialized to output. When the microcontroller outputs a high level to this module, the MOSFET in this module forms an N-channel, turning on the drain (D) and source (S) of the MOSFET, thus achieving the purpose of driving the motor. The main control module is equipped with a microcontroller unit (MCU) or digital signal processor (DSP) to generate PWM (pulse width modulation) signals. By controlling the switching state of KJO11N045T through PWM, precise control of motor speed and torque can be achieved.

[0018] like Figure 4 As shown, resistor R31, capacitor C8, and sampling resistor RS1 form an overcurrent protection module. The IM I / O pin connected to the microcontroller is initialized to input. When the microcontroller powers the MOSFET motor drive module and it starts working, the current generated by this module passes through the 5 milliohm sampling resistor. The voltage value across this resistor is calculated, and the RC acquisition module detects this voltage value and then calculates the corresponding AD value using a formula. The MCU sets the overcurrent protection threshold. When the microcontroller detects that the AD value at the IM port is greater than this protection value, the microcontroller outputs a low level through DRM to turn off the NMOS transistor, thereby protecting the motor.

[0019] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A motor drive system based on KJO11N045T, characterized in that, It includes a main control module, a power drive module, and an overcurrent protection module. The output terminal of the main control module is electrically connected to the input terminal of the power drive module, and the power drive module is used to control the current and voltage of the motor. The main control module is used to generate pulse width modulation signals and transmit them to the power drive module to control the motor speed and torque; The overcurrent protection module includes a current sensor and a current detection circuit, used to detect the motor current and provide an overcurrent protection signal.

2. The motor drive system based on KJO11N045T according to claim 1, characterized in that, The main control module integrates a U3 chip. Pin 9 of the U3 chip is electrically connected to the 5V voltage input, pin 7 of the U3 chip is grounded, and a capacitor C12 is electrically connected between pin 9 and pin 7 of the U3 chip.

3. The motor drive system based on KJO11N045T according to claim 2, characterized in that, The power drive module integrates an NMOS transistor QM1. Pin 1 of the NMOS transistor QM1 is electrically connected to resistors R19 and R25. Resistor R19 is electrically connected to pin 16 of the U3 chip. The resistor R25 is a gate-source pull-down resistor, used to determine the level, provide electrostatic discharge protection, limit the drive current, and eliminate oscillation signals; A capacitor C6 is electrically connected to pin 9 of the NMOS transistor QM1.

4. The motor drive system based on KJO11N045T according to claim 1, characterized in that, The overcurrent protection module integrates a sampling resistor RS1, which is electrically connected to a resistor R31. The resistor R31 is electrically connected to pin 14 of the U3 chip. A capacitor C8 is connected in parallel with the resistor R31, and the capacitor C8 is grounded.

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