Elmos Semiconductor Ag

Andre Schmidt

Egbert Spiegel

Guido Schlautmann

Stefanie Heppekausen

The invention relates to an ultrasonic measuring system (), in particular for measuring distance and/or as a parking aid in vehicles, having an electroacoustic ultrasonic transducer () which has a oscillating element (), does not have a voltage converter, can be alternately operated as an ultrasonic transmitter and an ultrasonic receiver and has a signal connection (), which is used either as an input or as an output of the ultrasonic transducer (), and an earth connection () which is connected to earth, and a control and evaluation unit () for exciting the oscillating element () of the ultrasonic transducer () to emit ultrasonic waves for operating the ultrasonic transducer () during a transmission interval for the purpose of subsequently deactivating the excitation of the oscillating element () and attenuating the latter during a decay phase and for receiving and processing ultrasonic waves in a reception interval. The control and evaluation unit () has a bridge circuit () which is connected to a DC supply voltage () and has controllable switches (to) and a charge storage capacitance (), the polarity of which can be reversed and which is intended to alternately output a positive and a negative excitation voltage for the signal connection () of the ultrasonic transducer () during the transmission interval. The control and evaluation unit () outputs a voltage pulse of substantially 0 V at the end of the transmission interval for the signal connection () of the ultrasonic transducer ().

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Dortmund, Germany

Andre Schmidt