LT6330B - Piezoelectric generator converting low frequency vibration into electrical energy. - Google Patents

Abstract

The invention relates to devices for electric power generation installations using the piezoelectric effect. The invention aims piezoelectric vibration generator of electricity produced and increase the operating frequency range, the generator excitation in a wide frequency range varying subwoofers periodic or random signals. This goal is reached that in piezoelectric generator of low-frequency vibrations of the conversion into electrical energy comprises in a frame arranged resonator with concentrated mass mounted on the end of bracket and at piezoelectric cantilever type actuator with concentrated mass mounted on a bracket end, at least one additional resonator is arranged in construction, a natural frequency of resonator satisfies the condition fk = n × f (k-1), where n - an integer, f - a resonator, the natural frequency (Hz), k - the resonator number (2? k? j, j - total cavity number) .

Description

The invention relates to the field of devices, in particular to devices for generating electric power using the piezoelectric effect,

It is an energy harvesting (piezoelectric) electric power generator. When the oscillator excites the generator, the piezoelectric layers of the generator are deformed and generate electricity.

State of the art

There is a known vibratory oscillator consisting of a piezoelectric transducer embedded in a shoe pad connected to an electric power processing and storage circuit. The piezo element of the generator is triggered when a person starts to walk; when the level of force generated by the human foot reaches a certain level, the piezoelectric bracket-type transducer starts to vibrate by impacting the rigid support, and the piezoelectric layer of the transducer is deformed to generate electricity (see US20060021261 Al, A43 B5 / 10, H02N 2/18, 2006).

There is a known vibrating oscillator consisting of one low frequency clamp type resonator (with concentrated mass attached to the end of the clamp) and one high frequency clamp type piezoelectric transducer (with concentrated mass attached to the clamp end) where the resonator, excited by low frequency oscillations, strikes the transducer oscillate at high frequencies and the piezoelectric layer of the converter to generate electricity (see US 2011/0074162 Al, F03G 7/08, H02N 2/18, 2011).

The single resonator used in the above device excites in a limited frequency range (adjacent to the resonator's own frequency), so such a generator is not capable of converting a wide frequency range of low frequency oscillations (very common in the environment) to electricity. As the excitation frequency changes over a wide range, such a generator will operate inefficiently: as the time-varying ambient oscillation frequency moves away from the resonator's own frequency, the amplitude of the resonator oscillations will decrease to such an extent that it no longer generates electricity.

The essence of the invention

The object of the present invention is to increase the electrical power and the operating frequency range of a vibrating piezoelectric generator by excitation of the generator in a wide frequency range by alternating low frequency periodic or random signal.

The stated objective is achieved by the fact that in the piezoelectric generator for the conversion of low frequency oscillations to electricity consisting of a housing mounted beam type resonator with a concentrated mass mounted on the end of the beam and a piezoelectric beam type converter with a concentrated mass mounted on the end eigenfrequency satisfies the condition f _k = nxf (ki), where n - integer, f - resonator eigenfrequency (Hz), k - resonator number (2 <k <j), j - total number of resonators).

Brief description of the drawing

The invention is explained in the figure.

FIG. illustrates the principle diagram of the conversion of the low frequency oscillations of a piezoelectric generator to electricity.

The piezoelectric generator for converting the low-frequency oscillations to electricity consists of two clamp-type HF-type piezoelectric transducers 2, 3 with concentrated masses 4, 5 attached at the end, consisting of a rectangular base 6, 7 covered with piezoelectric layers 8, , 11, 12, 13 and two bracket-type resonators 14, 15 mounted between transducers 2, 3 and consisting of brackets 16, 17 with concentric masses 18,19 attached at the rear.

Implementation of the invention

The device works as follows.

Exposed to a variable frequency periodic or random low frequency mechanical excitation signal, the resonators 14, 15 begin to oscillate, and the concentrated masses 18, 19 at the ends of the brackets 16, 17 strike individually or together (depending on the excitation frequency) on the concentrated masses at piezoelectric transducers 2, 3. 4, 5 thereby deforming the transducers and causing them to oscillate at high frequency. In the deformable piezoelectric layers 8, 9 of the transducers 2, 3 generates! the electrical charge that accumulates on the electrodes 10, 11 12, 13 and can be transmitted to an external electrical circuit connected to the generator.

Industrial applicability

Compared to the prototype, a new set of structural elements with rationally selected low frequency resonator eigenfrequencies enables efficient utilization of the total resonator impact on the piezoelectric transducers, which allows for an increase in the power generated by the oscillating piezoelectric generator and extension of the operating frequency a low frequency periodic or random signal.

Claims (2)

Definition of the Invention 1. Piezoelectric generator for converting low frequency oscillations to electricity, consisting of a housing-mounted bracket-type resonator with a concentrated mass mounted at the end of the bracket and a piezo-electric bracket-type converter with a concentrated mass mounted at the end of the bracket resonator. 2. Piezoelectric generator for converting low frequency oscillations to electricity according to claim 1, characterized in that the eigenfrequency of each auxiliary resonator satisfies the condition f _k = nxf (ki), where n is an integer, f is the eigenfrequency of the resonator (Hz), k - resonator number (2 <k <j), j is the total number of resonators).