Vehicle ultrasonic parking assistance apparatus including charge pumping circuit and method of operating the same

Abstract

Provided are a vehicle ultrasonic parking assistance apparatus including a charge pumping circuit and a method of operating the same. The vehicle ultrasonic parking assistance apparatus changes a transmission output voltage in a voltage driving scheme without using a transformer. By using the charge pumping circuit instead of the transformer so as to boost a voltage, the manufacturing cost is reduced, and a signal is input to the ultrasonic converter at the same voltage as a voltage of when the transformer is used. Also, the charge pumping circuit is provided at a region in which the variable current source was provided, and thus, the manufacturing cost is not additionally expended. Furthermore, since only a conversion of energy by the ultrasonic converter is considered, designing is simplified.

Description

technical field [0001] The present invention relates to a vehicle ultrasonic parking assist device using a charge pumping circuit and a working method thereof, in particular to a voltage-driven parking assisting device using a charge pumping circuit and a working method thereof. Background technique [0002] The existing ultrasonic parking assist device for vehicles is a device that emits ultrasonic waves into the atmosphere and then processes the signal reflected by the object to display the distance information to the object. It distinguishes noise by increasing the power of the signal reflected by the object. The transformer generates a high-voltage signal and emits high-voltage ultrasonic waves. [0003] That is, the conventional ultrasonic parking assist device for vehicles transmits and receives sound waves with a frequency of 20 kHz to 80 kHz into the atmosphere through an ultrasonic converter that converts voltage into sound pressure and vice versa. [0004] General...

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Problems solved by technology

[0021] However, when the actual reflected signal value of the ultrasonic parking assist device for vehicles is small, and the amplification factor of the received signal is increased in order to obtain a preset received signal, the noise will also increase, and the increased noise will increase the risk of false alarms. probability

[0022] To sum up, since the conventional ultrasonic parking assist device for vehicles adopts the current drive method, in order to input the driving voltage to the ultrasonic converter 20, it is necessary to have the transformer 10, and the transformer 10 has a larger power than the surface mount device. area and height, so it is not suitable as a component for making ultrasonic parking assist devices for vehicles

[0023] Moreover, the transformer 10 loses energy during the step-up process, and the difference between the transmission frequency response caused by the spread of the mutual inductance of the transformer 10 and the frequency response of the matching circuit 40 may cause distortion of the transmission signal

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