A circuit for collecting piezoelectric vibration energy

Abstract

The invention discloses a piezoelectric vibration energy collecting circuit, characterized in that it comprises a piezoelectric sheet, Positive Peak Detection Module, negative peak detection module, first inductance, first energy storage capacitor, A second energy storage capacitor and load, Pin 1 of the piezoelectric patch. the positive electrode of the positive peak detection module and the negative electrode of the negative peak detection module are connected, Pin 2 of the piezoelectric patch. one end of the first inductor and the negative electrode of the first energy storage capacitor areconnected, the negative electrode of the positive peak detection module, the output terminal of the negative peak detection module and the positive electrode of the first energy storage capacitor areconnected, the output terminal of the positive peak detection module, the positive electrode of the second energy storage capacitor and one end of the load are connected, the other end of the first inductance, the positive electrode of the negative peak detection module, the negative electrode of the second energy storage capacitor and the other end of the load are all grounded; The advantage isthat there are fewer energy dissipation elements in the circuit, which greatly reduces the overall power consumption of the LC loop in the circuit, improves the quality factor of the LC loop, and thusimproves the collection efficiency of piezoelectric vibration energy in the whole circuit.

Description

technical field [0001] The invention relates to an energy collection circuit, in particular to a piezoelectric vibration energy collection circuit. Background technique [0002] Piezoelectric vibration energy collection is a method of collecting vibration energy in the environment by using the piezoelectric effect of piezoelectric materials. Since the output voltage of the piezoelectric sheet is an AC signal, the general electronic equipment is powered by a DC power supply. Therefore, an interface circuit is needed between the piezoelectric sheet and the electronic device, and the conversion of AC voltage to DC voltage is realized through the interface circuit. [0003] The simplest interface circuit is a full-bridge rectifier circuit, but the efficiency of the full-bridge rectifier circuit is very low, so someone proposed a self-powered series synchronous switch energy harvesting circuit, a parallel synchronous switch energy harvesting circuit and a synchronous charge extra...

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Problems solved by technology

[0003] The simplest interface circuit is a full-bridge rectifier circuit, but the efficiency of the full-bridge rectifier circuit is very low, so someone proposed a self-powered series synchronous switch energy harvesting circuit, a parallel synchronous switch energy harvesting circuit and a synchronous charge extraction circuit, these non-linear Piezoelectric energy harvesting circuits use LC resonant circuits to extract piezoelectric energy, which can effectively improve energy harvesting efficiency. However, there are energy-consuming components such as diodes in the LC resonant circuits of these circuits, especially under the condition of weak piezoelectric energy. These energy-consuming components will consume most of the energy, resulting in low efficiency of energy harvesting

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