The sensorless control method of brushless DC motor is introduced and an inverter system based on M16C28 is presented. M16C28 is the heart of this design and it consists of many circuits,including MCU central control unit,rotor position detection circuit,inverter driver,DC-BUS voltage and current detection,motor protection,communication interface circuit,and so on. The sensorless control principle of brushless DC motor is expounded from many aspects such as PWM drive signal generation,PWM signal’s output modes and motor induced voltage. The hardware circuits of brushless DC motor control are introduced,at the same time, the software algorithm and module functions are explained. It is presented that this sensorless drive design for brushless DC motor has low cost,high efficiency and broad scope of motor speed adjustment.

This paper introduces the design for radio telecontrolled D-Lamp power supply, expounds its main circuit, remote control transmit circuit and remote control receive circuit. Main circuit realizes three control process: filament preheat, high voltage impact, stable current supply. The remote control transmit circuit realizes function key coding and radio transmit. The remote control receive circuit receives the coding signals from transmit circuit and decodes these signals, in the mean time, it finishes all logic control. This radio teleccntrolled D-Lamp power supply is an integrated power supply, it is composed of high voltage impact supply, filament preheating power supply. stable current supply and remote control receive circuit etc. This D-Lamp power supply is located in the DMD projection system and it is controlled by radio remote operation. We can realize power on, power off, filament voltage exchange, working current adjustment etc.

To realize the integration of the light source of the digital light processing(DLP) projection display with the other application systems and its automation,a remote light controller was developed.The light controller is composed of three circuits: the main circuit to control the filament preheating,the high-voltage excitation,and the stablized power supply;the radio transmission circuit to perform the key coding and the radio transmission;the receiving circuit to receive the coding information.Application in the DLP projection television shows that the light controller not only realizes remote operation,but also improves the output stability of light source and the image display quality.

介绍了DLP投影系统的特点,提出了基于DLP技术的背投电视机设计方案,并结合该设计方案,论述了DLP背投电视机的系统组成和工作原理,同时,也谈到了DLP背投电视机中的信号处理.

介绍了数字微镜器件(Digital Micmmirror Device,DMD)的特点,对DLP投影显示中的特殊技术进行了论述.DLP投影显示中的特殊技术主要表现在DMD及其电子学控制、DIP光学引擎设计、DLP光机结构设计等多个方面,例如DMD的结构、DMD的寻址和复位、DMD的二进制PWM驱动、色滤光片控制、光源控制器设计、消杂散光处理、热设计等.由于采用了这些特殊技术,DLP投影显示系统获得了高质量的显示图像,其可靠性也得到了极大提高.

Starting from the concept of M2 factor, this paper analyzed the relation between the M2-factor concept and the innate character of laser, and the factor M2 of some kinds of classical beams. The limitation of the factor M2 was studied. It also compared the appropriate areas for different definitions of laser beam quality and explored the influence factors on laser beam quality and controlling measures.

A kind of new design method about audiostimulator was introduced. This audiostimulator can provide short tone burst, single sine wave, continuous puretone, click, etc. To contrast with other old type audiostimulators, this audiostimulator has a standard RS232 interface and it can communicate with the system computer. This audiostimulator can be used by itself or by system computer. If it works with system computer, we can control it to choose sound signal type by system software. On the other hand, this apparatus can be easily developed into a common signal generator by some software changed.