Piezoelectric transducers provide a bidirectional channel for converting energy from mechanical form to electrical or in the opposite direction. Various applications were developed with either of these two energy-flow processes. For example, energy harvesters take advantage of the energy flow from mechanical to electrical domains, while vibration exciters utilize that from electrical to mechanical domains. However, few designs have integrated the bidirectional energy-flow processes in a single device in the past. Such an integration is beneficial to some multifunctional applications. The key obstacle of integrated bidirectional design results from the interface circuit design, rather than the transducer. This article makes a breakthrough by proposing a bidirectional energy conversion circuit (BECC) solution for the time-sharing energy harvesting and vibration exciting purpose. It is realized by developing a new control strategy on the synchronized triple bias-flip (S3BF) piezoelectric interface circuit, which was formerly used for energy harvesting enhancement. The control logic for energy harvesting and vibration exciting modes are discussed in detail. The time-sharing multi-functional ability is validated in experiments. It is the first time to realize a compact and integrated self-excitable energy harvester by using a single interface circuit. Experiments are carried out for validating the feasibility of the BECC toward future versatile engineering designs.

中文翻译：

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一种用于多功能压电能量收集和振动激励目的的双向能量转换电路


压电换能器提供双向通道，用于将能量从机械形式转换为电能或相反方向。利用这两种能量流过程开发了各种应用。例如，能量采集器利用从机械域到电气域的能量流，而振动激励器则利用从电气域到机械域的能量流。然而，过去很少有设计将双向能量流过程集成在单个设备中。这种集成有利于一些多功能应用程序。集成双向设计的主要障碍来自于接口电路设计，而不是传感器。本文取得突破性进展，提出了一种用于分时能量收集和振动激励目的的双向能量转换电路（BECC）解决方案。它是通过在同步三偏置翻转（S3BF）压电接口电路上开发一种新的控制策略来实现的，该电路以前用于增强能量收集。详细讨论了能量收集和振动激励模式的控制逻辑。实验验证了分时多功能能力。首次利用单一接口电路实现紧凑、集成的自激式能量收集器。进行实验是为了验证 BECC 对未来多功能工程设计的可行性。