随着电机技术及电力电子技术的共同发展和进步，效率高、寿命长、调速稳定性好的直流无刷电机被广泛应用于运输工具、医疗设备、家用电器等各个领域。在驱动直流无刷电机方面，直流无刷电机驱动芯片与基于RISC微处理器的驱动系统相比实时性更好，且较基于DSP的驱动系统具有外围电路简单，成本低等优势。因此，设计一款直流无刷电机驱动芯片极具研究意义和实际应用价值。

通过分析H桥上臂选择PMOS/NMOS的区别，考虑应用场合及成本等因素，针对小功率直流无刷电机选择PMOS作为H桥的上臂，采用可钳位栅源电压的PMOS快速驱动电路保证功率管栅源两端具有合适的电压，可防止PMOS击穿，提高了安全性，加快了PMOS的开关速度。通过对H桥电路的工作模式进行分析，得出了可有效降低驱动芯片功耗的开关次序，实现了功率管的零电压开通。根据得出的开关次序，设计了一种由左右侧控制电路、上下臂驱动电路组成的开关管驱动模块，满足了H桥上、下臂功率管驱动电压的要求，设定了死区时间防止功率管损坏。为保证H桥及开关驱动模块的稳定工作，进一步分析并设计了相关辅助模块：采用辅助电源模块为芯片内部数字逻辑与低压模拟电路提供稳定电压；采用正反馈差动放大电路和共源级放大电路两级结构设计迟滞比较器，通过设置阈值电压得到精确的电机转子位置信息。通过对电源反接保护与过温保护模块进行设计，提升驱动芯片的安全性能。综合上述模块，设计了一款直流无刷电机驱动芯片。

基于nuvoton 0.6μm BCD 仿真模型文件，采用Hspice软件对直流无刷电机驱动芯片的内部模块及整体电路进行仿真分析，结果验证了所设计电路的正确性与可行性。最后，基于nuvoton 0.6μm BCD设计规则文件对整体电路进行版图设计，通过了DRC、LVS，验证了直流无刷电机驱动芯片版图的正确性。

With the common development and progress of motor technology and power electronics technology, brushless DC motors with high efficiency, long-lived, and well speed regulation stability are widely used in various fields, including transportation, medical equipment, household appliances, etc. In terms of driving the DC brushless motor, the drive chip dedicated to the DC brushless motor has better real-time performance than the RISC microprocessor drive system, compared to the DSP drive system, it has the advantages of simple peripheral circuit and low cost. Therefore, the design of a brushless DC motor drive chip is of great research significance and practical application value.

By analyzing the difference between choosing PMOS/NMOS for the upper arm of the H-bridge. Considering some factors such as application and cost, PMOS is selected as the upper arm of the H-bridge for low-power brushless DC motors. The PMOS fast drive circuit that can clamp the gate-source voltage ensures that the gate source of the power tube has an appropriate voltage, which can prevent PMOS breakdown, improve safety, and speed up the switching speed of the PMOS. By analyzing the working mode of the H-bridge, the switching sequence that can effectively reduce the power consumption of the drive chip is determined, and the zero-voltage turn-on of the power tube is realized. According to the switching sequence of the H bridge power tube, a switch tube drive module composed of left and right side control circuit and upper and lower arm drive circuit is designed, which can meet the drive voltage requirements of the upper and lower arm power tubes of the H-bridge, and by setting the dead time to prevent damage to the power tube. In order to ensure the normal and stable operation of the H-bridge and switch drive circuit, the related auxiliary modules are further analyzed and designed. An auxiliary power module is designed to provide stable power supply for the internal digital logic circuits and low-voltage analog circuits of the chip. The hysteresis comparator with a two-stage structure of a positive feedback differential amplifier circuit and a common source amplifier circuit is designed. By setting the threshold voltage, accurate motor rotor position information can be obtained. By designing the power supply reverse connection protection and over-temperature protection modules, the safety performance of the driver chip is improved. Based on the above modules, a brushless DC motor driver chip is designed.

Based on the nuvoton 0.6μm BCD simulation model file, the Hspice is used to simulate and analyze the internal modules and the overall circuit of the DC brushless motor driver chip. The correctness and feasibility of the designed circuit are verified by simulation results. Finally, the nuvoton 0.6μm BCD process is used to design the layout of the overall circuit. The layout is verified by DRC and LVS. The results verify the correctness of the DC brushless motor driver chip and layout.

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