Abstract
The transformer used in the conventional ultrasonic ranging system could provide a huge instantaneous driving voltage for the generation of ultrasonic wave, which leads to the safety problem in the explosive mixture. This paper proposes a transformerless ultrasonic ranging system powered by the intrinsically safe power source and analog switches. The analysis of intrinsic characteristics of ultrasonic driving circuit is realized in normal and fault conditions. The echo-processing circuit combined with LIN bus technology is further adopted in order to improve the system stability. After the analysis of the timing diagram of ranging instruction, the evaluation experiments of ranging accuracy and ranging stability are completed. The results show that the system can realize reliable bidirectional communication between the LIN master node circuit and the ultrasonic transceiver unit, which realizes the transformerless driving. The system can realize the distance measurement within the range of 250–2700 mm, and the measurement error is less than 30 mm. The measurement fluctuation is less than 10 mm, which provides a new solution for the ultrasonic ranging system in the potentially explosive atmosphere.
Highlights
Due to the narrow working space in the industrial field, many special function vehicles have hidden hazards in the process of reversing, posing a huge threat to safety production [1]
We focus on the intrinsic safety design of ultrasonic ranging circuit, and the effect of ignition source ultrasound is not considered here
The transformerless ultrasonic driving circuit was designed by calculating the energy of the critical energy storage components in normal and fault conditions
Summary
Due to the narrow working space in the industrial field, many special function vehicles have hidden hazards in the process of reversing, posing a huge threat to safety production [1]. The traditional ultrasonic ranging system driven by the transformer has the disadvantages of large volume and high cost In this situation, a large driving voltage is required to drive the primary and secondary coils, and a high energy storage is generated while ensuring the driving performance [7]. A large driving voltage is required to drive the primary and secondary coils, and a high energy storage is generated while ensuring the driving performance [7] These effects could be dangerous in explosive atmospheres, because the ultrasound has been considered to be an ignition source in the international safety regulations such as EN 1127-1 [8]. We focus on the intrinsic safety design of ultrasonic ranging circuit, and the effect of ignition source ultrasound is not considered here. The echo-processing circuit combined with LIN bus technology is further adopted in order to improve the system stability
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