Turnover pulse width control circuit and control method of piezoelectric energy collection interface circuit

Abstract

The invention discloses a flip pulse width control circuit and control method of a piezoelectric energy collection interface circuit, the circuit comprises a piezoelectric sensor, an inductor, a switch, a detection circuit module, a pulse width control module and a switch signal module, the piezoelectric sensor, the detection circuit module, the pulse width control module, the switch signal module and the switch are connected in sequence, and the inductor is respectively connected with the switch and the piezoelectric sensor. The control method is applied to the working step of the flip pulse width control circuit of the piezoelectric energy collection interface circuit. The flip pulse width control circuit and control method of the piezoelectric energy collection interface circuit can be widely applied to the field of integrated circuits.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a flipping pulse width control circuit and a control method of a piezoelectric energy harvesting interface circuit. Background technique [0002] The full-bridge rectifier circuit is one of the most commonly used piezoelectric energy harvesting interface circuits, but during the rectification process, its energy harvesting efficiency is low because of the inherent energy loss on the internal parasitic capacitance of the piezoelectric sensor. Therefore, more and more interface circuits are proposed to improve the rectification efficiency of piezoelectric energy harvesting interface circuits. The piezoelectric energy harvesting interface circuit based on inductance synchronous inversion can significantly improve the energy harvesting efficiency of the interface circuit. It utilizes the series resonance of the inductor and the capacitor, which has no energy loss under ideal condit...

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Problems solved by technology

However, the interface circuit based on the inversion of the inductance requires more complex switching logic timing and control. During the LC resonance process, due to the rapid conversion of the voltage across the piezoelectric film, an erroneous output logic signal may be generated during this process. How to avoid the The impact of the generation of error signals on the normal control logic output of the circuit is also a problem that needs to be considered

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