超声电机驱动IC中的H桥电路设计

发布时间：2018-11-09 09:04

【摘要】：随着微型嵌入式电子设备与高精密机电设备产品的不断发展,对电机与驱动系统的一体化、小型化要求也日益迫切。超声电机具有小体积、高扭矩、响应快等优势,使其成为理想的微型电机,但超声电机对驱动器高输出电压的要求使其驱动电路体积的缩小较难实现。随着高压集成电路工艺的发展以及新型超声电机工作电压的降低,让设计单芯片、无变压器的超声电机驱动成为可能。为了设计一款单片集成的超声电机驱动IC,本文提出一种用于超声电机驱动IC的H桥电路,该电路基于特征尺寸为0.35μm、最高器件耐压40V的BCD芯片制造工艺,使用高压LDMOS器件作为功率开关,能够直接驱动工作电压在40V及以内的超声电机。内部集成两个对称的超声电机H桥驱动电路,输入与输出独立设计,其频率、相位参数可由外部激励源自由调节,满足超声电机对两路相位差90°驱动电压输入的需求,且无需片外器件,最大限度地缩小超声电机驱动系统的体积。本文所设计的H桥电路采用自适应与固定死区时间相结合的死区时间控制方法,合理设计栅驱动器结构,提升了LDMOS的开关速度。使用了高性能、低功耗的电平位移电路,实现了片内低压逻辑电平向高压栅驱动信号转换的功能,且通过一系列措施优化了电平位移电路的建立时间与稳定性。本H桥电路使用了无片外输出电容的栅驱动线性稳压器,并借助自适应偏置电流和实时补偿切换技术,提高了其在高瞬态负载电流环境下的相应性能。基于以上优化技术,本H桥电路可在0~3MHz宽频率范围工作,静态功耗最低仅有80μA。
[Abstract]:With the development of micro embedded electronic equipment and high precision electromechanical equipment, the integration of motor and drive system, miniaturization is becoming more and more urgent. Ultrasonic motor has the advantages of small volume, high torque and fast response, which makes it an ideal miniature motor. However, the requirement of high output voltage of ultrasonic motor makes it difficult to reduce the volume of drive circuit. With the development of HV IC technology and the decrease of working voltage of new ultrasonic motor, it is possible to design single chip and transformer free ultrasonic motor drive. In order to design a monolithic integrated ultrasonic motor driven IC, this paper presents an H-bridge circuit for ultrasonic motor driving IC. The circuit is based on the fabrication process of a BCD chip with a characteristic size of 0.35 渭 m and a maximum voltage of 40V. Using high voltage LDMOS device as power switch, ultrasonic motor with working voltage of 40 V and less than 40 V can be driven directly. Two symmetrical H-bridge drive circuits of ultrasonic motor are integrated inside, the input and output are designed independently, its frequency and phase parameters can be freely adjusted by external excitation source, which can meet the demand of ultrasonic motor for the 90 掳drive voltage input of the two channels of phase difference. Furthermore, the volume of ultrasonic motor drive system is minimized without the need of out-of-chip devices. The H bridge circuit designed in this paper adopts the dead-time control method which combines adaptive control and fixed dead-time. The gate driver structure is designed rationally and the switching speed of LDMOS is improved. The high performance and low power level displacement circuit is used to realize the conversion function of the low voltage logic level to the high voltage gate driving signal. The establishment time and stability of the level displacement circuit are optimized by a series of measures. The H bridge circuit uses a gate driven linear voltage regulator without an output-output capacitor, and improves its performance under high transient load current environment by means of adaptive bias current and real-time compensation switching technology. Based on the above optimization techniques, the H-bridge circuit can work in a wide frequency range of 0~3MHz with the lowest static power consumption of 80 渭 A.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN402;TM359.9

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