Ultrasonic measuring system, in particular for measuring distance and/or as a parking aid in vehicles

US10739453B2 · kind B2 · utility

Assignee

• ELMOS SEMICONDUCTOR SE · DE

Inventors

• Andre Schmidt · Herzogenaurach, DE
• Egbert Spiegel · Marl, DE
• Guido Schlautmann · Altenberge, DE
• Stefanie Heppekausen · Essen, DE

Key dates

• Filing date: Feb 14, 2017
• Grant date: Aug 11, 2020
• Expiry date: Feb 14, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S2015/932
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to an ultrasonic measuring system (10), in particular for measuring distance and/or as a parking aid in vehicles, having an electroacoustic ultrasonic transducer (12) which has a oscillating element (14), does not have a voltage converter, can be alternately operated as an ultrasonic transmitter and an ultrasonic receiver and has a signal connection (16), which is used either as an input or as an output of the ultrasonic transducer (12), and an earth connection (18) which is connected to earth, and a control and evaluation unit (20) for exciting the oscillating element (14) of the ultrasonic transducer (12) to emit ultrasonic waves for operating the ultrasonic transducer (12) during a transmission interval for the purpose of subsequently deactivating the excitation of the oscillating element (14) and attenuating the latter during a decay phase and for receiving and processing ultrasonic waves in a reception interval. The control and evaluation unit (20) has a bridge circuit (28) which is connected to a DC supply voltage (80) and has controllable switches (30 to 40) and a charge storage capacitance (42), the polarity of which can be reversed and which is intend…