| 摘要 |
A Hall element switching system which provide clean switching and wherein the system operate and release points are the same. The system includes a Hall element, first and second comparator circuits and a feedback circuit. The Hall element is the sensing part of the system and produces a voltage output which is proportional to the strength of the magnetic field impinging thereon. The output of the Hall element controls the switching of the first and second comparator circuits. The second comparator circuit, in turn, controls the output of the feedback circuit. The feedback circuit output is connected to the input of the first comparator circuit and can be at one of three levels. The feedback circuit by being connected to the input of the first comparator circuit causes a shift in the operate and release points of the first comparator circuit. The output of the first comparator circuit is the system output. By appropriate choice of the feedback signal, the system will operate and release at the same magnetic field intensity of the Hall element. But because hysteresis remains in the operation of each comparator circuit, clean switching is provided.
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