POLARITY SWITCHING CIRCUIT
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United States of America Patent
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app pub date -
Aug 26, 2013
filing date -
Aug 7, 2012
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Abandoned
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Abstract
A polar switch circuit is disclosed. The polar switch circuit comprises the first to the forth transistor switches and the first to the second filter circuits. The first and forth transistor switches are controlled by a first pulse-width modulating signal. The second and third transistor switches are controlled by a second pulse-width modulating signal. The second and the fourth transistor switches are connected with a DC high voltage, and connected with the first and third transistor switches, respectively. The first filter circuit is connected with the first transistor switch, the second transistor switch and a contact of a piezoelectric actuator. The second filter circuit is connected with the third transistor switch, the forth transistor switch and another contact of the piezoelectric actuator. When the first and second pulse-width modulating signals switch high/low level in interlaced, an output AC voltage can be smooth and deliver to the contacts of the piezoelectric actuator.
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