Stepper motors are divided into variable reluctance (VR), permanent magnet (PM) and hybrid (Hybrid) stepper motors. In the automotive environment, the most commonly used is a permanent magnet type stepper motor whose rotor is a permanent magnet. In automotive applications, there are many occasions where stepper motors are required, such as AFS headlamp horizontal position adjustment, corner adjustment, and light geometry adjustment, all requiring a stepper motor as the actuator. Figure 1 is a schematic diagram of a typical AFS system. Figure 2 shows Infineon's chipset solution for AFS applications.
As a leading automotive semiconductor supplier, Infineon has developed a stepper motor dedicated control chip TLE4729G to solve automotive stepper motor control and drive problems. This controller has a range of excellent performance and is used by most component suppliers in system integration.
Infineon also provides a number of application notes in addition to the basic data sheet of TLE4729G to facilitate the rapid design of the system. This article explains and explains the stepper motor system and diagnostic points based on the evaluation board. A complement to Infineon's stepper motor control technology support. TLE4729G is used to control and drive the intelligent power device of two-phase stepping motor. Its internal structure is shown in Figure 3. Among them, the important port descriptions related to the application are shown in Table 1.
Screen Resolution
There are generally three screen resolutions for office projectors:
One is a 4:3 screen suitable for office PPT playback. The first is the SVGA machine with the lowest price and the highest cost performance. This kind of machine is generally priced at around 2500 and has powerful performance. The disadvantage is that the resolution is 800X600, which is relatively low. The second is the XGA machine, which is an upgraded version of the SVGA machine with a resolution of 1024X768.
The other is the 16:10 aspect ratio screen used by some foreign-funded enterprises, which is the 1280X800 resolution of WXGA. However, with the transparent price of 1080p projectors, more and more companies will choose full HD 1080p projectors as their office projection solutions.
Office Projector Features
According to the needs of different office environments, office projectors are roughly divided into three categories.
One is a conventional projector that is placed or hoisted in the conference room, the second is a Portable Projector that can be carried around, and the third is an ultra-short-throw projector that is convenient for work reports and speeches.
Wireless Office Projector
With the advent of the Internet era, the emergence of a series of wireless office series has added new members to the office projectors. The wireless office projector is realized by the built-in wireless module of the ordinary office projector. Wireless office makes people do not need to switch signal lines frequently in office meetings, allowing people to have a better experience in meetings!
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