The invention discloses a piezoelectric energy
collection system and a control method thereof. The piezoelectric energy
collection system comprises a piezoelectric energy collector, an active
rectifier, a Buck-
boost converter, an asynchronous
control circuit, a self-startup precharge circuit, a
peak detection circuit, an
inductance input-end
voltage zero-crossing detection circuit, a VDD-end
energy storage unit, a
charge current zero-crossing detection circuit of the VDD-end
energy storage unit, a VST-end
energy storage unit, a
charge current zero-crossing detection circuit of the VST-end energy storage unit, an inter-storage-unit energy conversion circuit, an LDO
voltage-stabilizing circuit, a VDD internal
voltage-stabilizing circuit and a low-power
reference current source and reference voltage generation circuit. According to the invention, an ultralow-power
design technology is introduced, a conventional circuit structure is improved, performance optimization and structural innovation are performed on each circuit module, static
power consumption of the whole circuit
system is reduced to 111.1nW, and the
energy conversion efficiency is as high as 89.4%. Besides, the
system also has the advantages of small
chip area, high integration, complete
automation, high
adaptive capacity to environment and the like.