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采用四阶LCLC谐振电路的高升压比DC-AC转换器用于超声波指纹传感器驱动器。

High Step-Up Ratio DC-AC Converter Using Fourth-Order LCLC Resonant Circuit for Ultrasonic Fingerprint-Sensor Drivers.

作者信息

Liu Wei, Shi Yunlai, Sun Zhijun, Zhang Li, Zhang Qian

机构信息

State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

出版信息

Micromachines (Basel). 2023 Feb 4;14(2):393. doi: 10.3390/mi14020393.

DOI:10.3390/mi14020393
PMID:36838093
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9965756/
Abstract

Ultrasonic fingerprint sensors are becoming more widely used in thick or flexible displays. In order to better identify fingerprint information, ultrasonic sensors need to generate more ultrasonic energy, which can be transmitted to the display surface through media with higher acoustic impedance. In this paper, a DC-AC converter with a high lift ratio was proposed to enhance the transmission energy of the ultrasonic fingerprint sensor, thus helping to improve the identification. The converter comprises a full-bridge inverter and two LC resonant circuits. The introduction of an additional LC resonant circuit into the traditional Class-D LC resonant converter effectively increases the boost ratio of the proposed converter from 5 to 22. When used as a part of the ultrasonic fingerprint sensing system, the proposed converter can amplify the 20-V low-voltage DC required to drive the piezoelectric organic film to 376 V high-voltage AC. The voltage of the wave received from this new driver is equal to 970 mV, which greatly exceeds the 376 mV achieved by using the Class-D converter alone. In this paper, the topology proposed by the ultrasonic fingerprint sensor converter driver was experimentally verified, which greatly improved the boost ratio and can be considered suitable for wider applications.

摘要

超声波指纹传感器在厚屏或柔性显示屏中的应用越来越广泛。为了更好地识别指纹信息，超声波传感器需要产生更多的超声波能量，这些能量可以通过具有更高声阻抗的介质传输到显示屏表面。本文提出了一种具有高升压比的DC-AC转换器，以增强超声波指纹传感器的传输能量，从而有助于提高识别效果。该转换器包括一个全桥逆变器和两个LC谐振电路。在传统的D类LC谐振转换器中引入一个额外的LC谐振电路，有效地将所提出的转换器的升压比从5提高到22。当用作超声波指纹传感系统的一部分时，所提出的转换器可以将驱动压电有机薄膜所需的20V低压直流电放大到376V高压交流电。从这个新驱动器接收到的波的电压等于970mV，大大超过了仅使用D类转换器时所达到的376mV。本文对超声波指纹传感器转换器驱动器所提出的拓扑结构进行了实验验证，其大大提高了升压比，可认为适用于更广泛的应用。

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本文引用的文献

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