Self-adaptive piezoelectric energy collection interface circuit

Abstract

The invention provides a self-adaptive piezoelectric energy collection interface circuit. The circuit comprises a synchronous switch extraction module, an active rectifier module, a self-adaptive pulse generation circuit, a digital control circuit and a channel selection and processing module. The input end of the synchronous switch extraction module is connected with the two ends of a piezoelectric sensor and is sequentially connected with an external inductor and an external capacitor; the input end of the active rectifier module is connected with the two ends of the piezoelectric sensor, and the output end of the active rectifier module is connected with the output capacitor and an intermittent power management circuit; the self-adaptive pulse generation circuit is connected with the digital control circuit; and the channel selection and processing module comprises a bidirectional change-over switch used for capacitor selection, wherein the output end of the bidirectional change-over switch is connected with the two ends of a storage capacitor respectively. According to the invention, the charge loss in a reversal loop can be effectively reduced, so that the piezoelectric energycollection efficiency is improved; and the capacitor in the reversal loop and the post-stage storage capacitor are reused, so that the use number of the capacitors is reduced.

Description

technical field [0001] The invention relates to a wireless sensor network and the field of energy conversion, and belongs to the field of integrated circuits, in particular to an adaptive piezoelectric energy collection interface circuit. Background technique [0002] With the application of wireless sensor networks more and more widely, the traditional energy supply scheme powered by power supply or battery restricts the development of wireless sensor networks. Energy harvesting technology can collect energy in the natural environment and convert it into usable electrical energy, so energy harvesting technology has become an important technology to solve the energy supply problem of wireless sensor network nodes, among which piezoelectric energy harvesting is the solution to the problem of wireless sensor network nodes. One of the key solutions to the energy supply problem. In recent years, the research on interface circuits for piezoelectric energy harvesting has shown a ...

AI Technical Summary

Problems solved by technology

According to the equivalent model of the piezoelectric sensor, in the process of energy harvesting, the charging and discharging of its internal capacitance will cause energy loss, which seriously affects the efficiency of energy harvesting. The existing circuit structure will seriously deplete the charge of its internal capacitance, so Energy harvesting is not efficient

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