How to cut switching loss in motor control
نویسنده
چکیده
Guest columnist Alfred Hesener, European marketing director at Fairchild Semiconductor, describes how good design of power switches can help reduce losses in motor control circuits. Energy-saving drives with brushless DC motors can be found everywhere, and the dust has settled somewhat, since the challenge consists of integrating a complex Add your search term here electronic control circuit into the motor, at realistic cost levels, to enable relevant advantages for the user. Significant potential for increasing the performance is with the power stage driving the motor, that sits like a " muscle " between the microcontroller and the motor. The switching and conduction losses in this stage affect the necessary size and thermal design of the application. Figure 1 shows a typical application circuit, where the module block diagram shows the high level of integration, reducing external component count. On the far left sits the microcontroller, that can control all power switches of the three half bridges individually. Depending on the application, low pass filters may be required to help suppress wrong triggering due to noise.
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تاریخ انتشار 2011