多相功率驱动单芯片集成方法及能量输运研究

This application is put forward for the goal-specific project-37, Research on monolithic integration method and energy transport of multi-phase power driver, which is listed in the “Training Program of NSAF Collaborative Fund”. In order to meet the urgent need of the miniaturization of the ultrasonic motor and its drive circuit in the ignition password system of equipment, monolithic integration method and energy transport study of multi-phase power driver are developed deeply. Three innovations are included: 1) Energy transport model of ultrasonic motor driving is proposed. Aiming at the complex energy relationship in the power driver of ultrasonic motor, the deep scientific problems of the power driving process are studied, the topology of the multi-phase and monolithic power driver circuit is confirmed, the energy coupling relationship is analyzed and the energy transport model is established. 2) Multi-voltage transfer mechanism on chip is established. Aiming at the feature that the power driver circuit includes the low-voltage control circuits and the high-voltage power devices, the complex relationship of the level translation is combed, the efficiency multi-voltage transfer mechanism is established. 3) High efficiency and low noise monolithic integration method is proposed. This method involves two aspects: The level shifter structure and the efficient bridge driven bootstrap method in the monolithic integration method are given out based on the multi-voltage transfer mechanism; Aiming at the problems of the substrate noise in the integrated circuit and switching noise in the multi-phase power driver, the generating mechanism and coupling path of the noise are analyzed, the interleaved-pulse method and other noise-reduction methods are proposed. This project is an international lasted research which is not reported before. And the above researches can establish the theoretical foundation for monolithic integration of multi-phase power driver, this method has important scientific significance and application perspective.

本申请针对“培育项目”的明确目标课题-37，多相功率驱动单芯片集成方法及能量输运研究而提出。面向装备点火密码系统中超声电机驱动电路小型化的迫切需求，深入研究多相功率驱动单芯片集成方法及能量输运机理。创新点有三：1）提出超声电机驱动的能量输运模型。针对超声电机功率驱动中的能量转换，进行其科学问题研究，确定多相单片驱动拓扑结构，分析其能量耦合关系，建立能量输运模型；2）制定片内多电压转换机制。针对该功率驱动含低压控制电路和高压功率器件的特点，梳理其复杂供电电平关系，制定高效多电压转换机制；3）提出高效低噪单芯片集成方法。该方法涉及两方面：基于多电压转换机制，给出单片集成电平转移结构及高效桥驱自举方法；针对集成衬底噪声及多相功率开关噪声，分析其产生机理及耦合途径，提出脉冲错相等降噪方法。此项目为国际前沿研究，尚未见报道，可为多相功率驱动单片集成奠定理论基础，有重要科学意义和应用前景。

超声电机（USM）是一种新型电机，较传统电磁电机，具有无电磁干扰、结构简单、扭矩大等诸多优势，在越来越多的领域中得到广泛应用，成为国内外研究热点。而小型化和集成化是USM发展的重要趋势。目前USM的驱动器还是停留在多颗芯片共同完成的状态，不仅系统体积大，且耗能多，亟需小型化、集成化。.面向装备点火密码系统中超声电机驱动电路小型化的迫切需求，本项目进行了USM多相功率驱动单芯片集成方法及能量输运的研究。研究内容包括：（1）深入研究USM工作机理、分析现有驱动方案，提出超声电机Boost+H桥的单芯片驱动电路结构；（2）深入研究USM多相功率驱动系统能量输运机理，建立USM驱动的能量输运模型；（3）基于所提出的USM单芯片驱动电路结构，制定片内多电压转换机制；（4）基于BCD工艺，研究高效低噪多相功率驱动单片集成方法；（5）设计满足联合单位新型USM所需的驱动芯片。.项目取得的成果主要包括：（1）在理论研究方面，获得考虑了定子、转子、摩擦层和预压力的USM精确等效电路模型；并给其LLCC谐振电路的模型；提出了自适应死区等效率提升技术和芯片级与PCB板级多项抗噪措施，形成了高效低噪多相功率驱动单片集成方法；（2）在基础应用方面，形成USM多相功率驱动单芯片集成关键技术，设计了USM驱动IC，经LLCC谐振后可输出两路相差90°、幅值为40-60V的正弦信号，满足联合单位研制的USM需求；（3）在学术成果方面，在国内外刊物、学术会议上发表论文12篇；申请专利13项，其中授权中国发明专利8项、美国专利1项。.本项目所建立的USM精确等效电路模型可推广至所有行波USM的分析与应用设计中，所形成的多相功率驱动集成方法可作为指导USM驱动集成化设计的理论依据，具有普适性。该研究对形成具有我国自主知识产权的先进技术、满足诸多应用对USM驱动小型化的迫切需求具有重大科学意义和应用前景。