Low-frequency and low-loss energy management chip based on piezoelectric effect

Abstract

The invention belongs to the technical field of energy, power supply and micro electronics, and relates to a low-frequency and low-loss energy management chip based on a piezoelectric effect, wherein the energy management chip collects environmental energy from a piezoelectric element and provides a voltage-stabilized power supply for micro-power equipment through energy management. The chip comprises an SSHI circuit and a DC-DC converter circuit, and is characterized in that the SSHI circuit can collect more energy of the piezoelectric element; and the DC-DC converter circuit can operate at low frequency, and the width of a power tube of the DC-DC converter circuit is smaller than that of a general commercial power tube. Compared with a piezoelectric energy management circuit in the prior art, the chip provided by the invention can obviously reduce the power consumption, is not only suitable for collecting more energy at a high-vibration level, but also capable of collecting energy effectively at a low-vibration level, thereby effectively improving the energy collection efficiency.

Description

technical field [0001] The invention belongs to the technical fields of energy, power supply and microelectronics, and relates to an energy management chip, which collects vibration energy from a piezoelectric element and provides a stable voltage power supply for micropower equipment through energy management. Background technique [0002] Over the past decade, thanks to advances in energy conversion and low-power electronics, energy harvesters have been extensively studied and applied, the most prominent example being powering wireless sensor networks. Its main bottleneck is the power supply of each node. Currently, there are many forms of energy in the environment, and their energy densities are shown in Table 1. [0003] Table 1 Energy density in the environment [0004] the energy Energy Density Solar (outdoor) 15000uW / cm 3 Solar (indoor) 10uW / cm 3 vibration (piezoelectric) 250uW / cm 3 Temperature difference (...

AI Technical Summary

Problems solved by technology

Most of the piezoelectric energy management circuits that have been developed so far are looking for DC-DC converter chips with relatively low loss on the market, which are directly used as a module in the entire circuit. From the perspective of optimizing energy management, there are actually very few There is a way to reduce the loss of the chip

On the other hand, if the output power of a piezoelectric element is relatively low, it is not suitable for operation at high frequencies.

However, the relatively low switching frequency of the DC-DC converter will cause a relatively large output voltage ripple and a decrease in reliability.

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