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Devices, systems and processes for improving frequency measurements during reverberation periods for ultra-sonic transducers

A transducer and reverberation technology, applied in the field of obstacle detection, can solve problems such as DC voltage offset, increase, and impact measurement

Pending Publication Date: 2021-08-06
SEMICON COMPONENTS IND LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when such parallel resonances are eliminated, a DC voltage offset (increase) will generally occur in the receive signal provided by the transducer to the receiver component
Such DC offset delays and otherwise adversely affects measurements of one or more PAS sensor characteristics detected by the receiver during the reverberation period

Method used

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  • Devices, systems and processes for improving frequency measurements during reverberation periods for ultra-sonic transducers
  • Devices, systems and processes for improving frequency measurements during reverberation periods for ultra-sonic transducers
  • Devices, systems and processes for improving frequency measurements during reverberation periods for ultra-sonic transducers

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Embodiment Construction

[0033] Various embodiments described herein relate to short

[0034] Apparatus, system and method for damping DC offset in a received signal of a PAS sensor during a period (PSSP). As used herein, "damping" (and its conjugates) refers to damping, reducing and / or eliminating the DC offset from the received signal of the PAS sensor.

[0035] Such as Figure 1A to Figure 1C As shown, the PAS sensor 100 generally includes a transmitter 102 coupled to a set of first induction coils L1 located on the primary side of a transformer TR1. A second induction coil L2 on the secondary side of the transformer TR1 is coupled to a transducer PZ1 which transmits one or more ranging signals and receives one or more receiving signals. Such transmission and reception typically occurs at ultrasonic frequencies, such as 50 kHz or other frequencies. One or more circuit elements are provided for controlling such transmissions, determining frequency and other components of transmitted ranging signal...

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Abstract

The invention discloses devices, systems and processes for improving frequency measurements during reverberation periods for ultra-sonic transducers. Embodiments include a primary short circuit (PSC) coupled to a primary side of a transformer and a dampening element, coupled to a transducer coupled to a secondary side of the transformer, configured to dampen a received signal during a portion of a reverberation period. The PSC and the dampening element may be activated substantially simultaneously. Activation of the PSC circuit mitigates a parallel resonance otherwise arising, in part, in the transducer, but, increases the received signal by a DC shift voltage. The dampening element dampens the DC shift voltage. The received signal may be dampened prior to amplification of the received signal by an amplifier. The dampening facilitates earlier and more precise measurement, during the reverberation period, of at least one operating characteristic for the PAS sensor. Another embodiment prevents the DC shift voltage by selectively activating the PSC within a determined time of a zero-crossing of a given signal.

Description

technical field [0001] The technology generally relates to devices, systems and methods for detecting obstacles. More specifically, the technology relates to parking assist sensors and other sensors used to detect obstacles. The technology also involves the use of ultrasonic sensors to detect obstacles. The technology also involves determining the frequency of operation of the transducer. Transducers can be used in ultrasonic sensors. The technology also involves determining the operating frequency of the transducer based on a measurement of one or more reverberations after the ranging signal is sent by the transducer. Background technique [0002] Today, various sensor systems are used with motor vehicles and other systems. Examples of such sensor systems include parking assist sensors, reversing sensors, blind spot detection sensors, collision avoidance sensors, and others (collectively, each sensor herein "PAS" sensor and the set of sensors forming a PAS system). PAS...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/08
CPCG01S15/08B06B1/0215B06B2201/30B06B2201/55G10K9/18G10K9/122
Inventor Z·阿克斯曼T·萨奇P·卡梅尼茨基
Owner SEMICON COMPONENTS IND LLC