MORAES JÚNIOR, T. O.; http://lattes.cnpq.br/0334320944459752; MORAES JÚNIOR, Tarcísio Oliveira de.
Abstract:
The microelectronic technology advancements have been making possible the
reduction of power consumption allowing the development of energy harvesting systems to
low-power electronic devices. In this context, low-power conditioning circuits have been
needed to regulate and manage the output voltage levels from an energy harvester in order
to power those devices correctly. In this work, it is proposed a high-efficiency power
conditioning circuit applied to Radio-Frequency energy harvester capable to carry out
adequate power conditioning to supply regulated output voltage to an electronic device. In
this way, a full-wave CMOS rectifier, a DC/DC converter, an oscillator circuit and a
voltage regulator were developed where a novel topology of the rectifier circuit based on a
bulk-biasing control circuit that reduces leakage currents through its transistors was
proposed and, as a result, it shows to be possible to achieve 6% more efficiency as
compared to the best results of rectifiers described in the scientific literature. The
capacitive inductive hybrid DC/DC converter is clocked by the oscillator circuit powered
by the power conditioning circuit itself. In fact, the whole proposed power conditioning
circuit does not require any external power supply for its operation, unlike some ones
described in recent published papers. The power conditioning circuit was designed using
the Virtuoso/Cadence software and was shipped for manufacturing with a 130 nm CMOS
technology. The proposed conditioning circuit is capable of supplying -19,09 dBm, with
14.5% of efficiency and 3.3 V of output voltage, when the received power and input
voltage are -10.7 dBm and 600 mV, respectively. In addition, the experimental and
simulation results were compared with other studies.
