This brief describes an astable multivibrator aimed to low voltage energy harvesting using inductive coupling and bipolar junction transistors. The topology needs a bias voltage at the bases, and we propose a circuit called starting block to generate this voltage from the supply. A proof-of-concept circuit with discrete devices was able to work with a voltage as low as 50 mV and deliver 3.3 mW from a 100 mV supply. To the authors’ knowledge, it is the energy harvesting circuit with highest power capacity. It has the additional advantage of using conventional devices, in contrast with other approaches that use special devices like junction field effect transistors and native metal–oxide-semiconductor field effect transistors (MOSFETs). The circuit also needs a smaller transformer when compared to its version using conventional MOSFETs.

本简介描述了一种旨在使用电感耦合和双极结型晶体管收集低压能量的非稳态多谐振荡器。该拓扑结构在基极需要偏置电压，我们提出了一个称为起始块的电路来从电源产生这个电压。具有分立器件的概念验证电路能够在低至 50 mV 的电压下工作，并从 100 mV 电源提供 3.3 mW。据作者所知，它是具有最高功率容量的能量收集电路。与使用特殊器件（如结型场效应晶体管和原生金属氧化物半导体场效应晶体管 (MOSFET)）的其他方法相比，它具有使用传统器件的额外优势。与使用传统 MOSFET 的版本相比，该电路还需要一个更小的变压器。