Patent ID: 9453909
Filing Date: 2016-09-27
CPC Classification: B06B,G01S

Claim Text:
1. An ultrasonic pulse-echo ranging device comprising: a piezo-electric transducer configured to emit ultrasonic waves to a target and to receive echo waves reflected by the target; a transmitter having an output for driving the transducer; a receiver having an input for receiving signals from the transducer; a first transformer having a primary winding coupled to the output of the transmitter and a secondary winding connected to the transducer; a second transformer having a primary winding coupled to the input of the receiver and a secondary winding connected to the transducer, the secondary windings of the first and second transformers being in series with the transducer; a first switching element arranged in parallel with the primary winding of the first transformer, said first switching element being controlled to short-circuit the primary winding of the first transformer when the receiver is receiving the signals from the transducer; and a second switching element arranged in parallel with the primary winding of the second transformer, said second switching element being controlled to short-circuit the primary winding of the second transformer when the transmitter is driving the transducer.