RU136937U1 - PIEZOELECTRIC GENERATOR - Google Patents

Abstract

A piezoelectric generator relates to electromechanical energy converters, namely, converters operating on the basis of the use of piezoelectric materials, and can be used in any field of technology as a current source. The generator contains a piezoelectric transducer made in the form of a flat bimorph sectional plate, consisting of a set of polarized rectangular piezoelectric elements combined in sections. The piezoelectric elements inside each section, as well as the sections between themselves, are electrically connected in series or in parallel. The generator contains a resistor, a rectifier, a storage capacitor, a circuit that controls the charge of the capacitor and a battery. The transducer is attached to objects subject to vibration, and the generator generates electrical energy due to the vibration energy of the object to which it is attached. Technical result achieved: the use of free vibration energy to generate electricity; increasing the power of the piezoelectric generator; saving of electric energy or its receipt in those places where it is absent.

Description

The utility model relates to electromechanical energy converters, namely to converters operating on the basis of the use of piezoceramic materials, and can be used in any field of technology as a current source.

A known piezoelectric direct current generator, for example RU 2113757, containing a piezoelectric element made in the form of a flat bimorph disk mounted in the center of the disk, and axially deformed by two rollers mounted on the rotor through a flexible insulating gasket. The piezoelectric element may contain many piezoceramic discs to increase power. When the rotor rotates from an external source of mechanical energy, the rollers that are mounted relative to the disk elements in such a way that their deformation is ensured are rolled along the gasket, deforming the piezoelectric elements. When the piezoelectric elements are deformed on the electrodes due to the direct piezoelectric effect, charges arise, while on the external electrodes of the piezoelectric element - charges of the opposite sign, which make up the potential difference.

During the rotation of the rotor and the circular deformation of the piezoelectric element on the electrodes, a constant potential difference arises, corresponding to the strain value.

The disadvantages of this generator are that it is driven by an external energy source, such as wind or water, i.e. requires an additional energy conversion device. In addition, by virtue of its design, it is limited by the size of the piezoelectric element, and therefore, the generated energy is also limited. There is no electrical energy storage.

A piezoelectric generator is also known, for example, US Pat. No. 5,801,475, which contains a cantilever-mounted bimorph piezoelectric element that oscillates under the influence of external vibrations, as a result of which a variable potential difference, a resistor, a rectifier element, a storage capacitor, and an output regulating electronic circuit are generated on its plates by a direct piezoelectric effect.

The considered solution is the closest in the aggregate of essential features to the proposed solution.

The disadvantages of this generator include its small size and cantilever fixing of the piezoelectric element, as a result, low output power and increased fragility. These disadvantages limit the use of such a generator only to microelectronic devices.

The problem solved by the proposed utility model is to increase the electric power of the piezoelectric generator, as well as the use of free vibration energy of various industrial, construction, road and household structures.

The problem is solved due to the fact that the proposed utility model, like the well-known piezoelectric generator, contains a piezoelectric transducer, in parallel with which is included a resistor, a rectifier, a storage capacitor and an output regulatory electronic circuit. But, unlike the known one, in the proposed generator the piezoelectric transducer is made in the form of a flat sectioned transducer, the sections of which are electrically connected to each other, and each section consists of one or more piezoelectric elements glued to each other and electrically connected to each other.

Achievable technical result is an increase in the power of the piezoelectric generator and the possibility of using free energy.

The set of features formulated in paragraph 2 of the utility model formula characterizes a piezoelectric generator in which the transducers in each section are connected in series.

The technical result achieved is an increase in the output voltage of the piezoelectric generator and a decrease in the generator’s own electric capacity.

The set of features formulated in paragraph 3 of the utility model formula characterizes a piezoelectric generator in which the transducers in each section are connected in parallel.

The technical result achieved is an increase in the electric charge generated by the piezoelectric generator.

The utility model is illustrated by drawings, where:

in FIG. 1 shows a diagram of a piezoelectric generator;

in FIG. 2 is a schematic illustration of an embodiment of a component of a piezoelectric generator — a bimorph transducer;

in FIG. 3 and 4 are examples of installation of the converter.

The piezoelectric generator (Fig. 1) has a bimorph piezoelectric transducer 1, a resistor 2, a rectifier 3, a storage capacitor 4, a circuit that controls the charge of the battery 5 and the battery 6.

The piezoelectric transducer 1 (Fig. 2) is made in the form of a flat bimorph sectional plate, consisting of a set of polarized rectangular piezoelectric elements combined in sections 7-12. The piezoelectric elements inside each section, as well as the sections between themselves, are electrically connected in series or in parallel, depending on what voltage and what power is required from the converter. In the above example, the converter (Fig. 2), the upper part consists of six sections 7-12 with five elements in each, connected in series. All sections are connected in parallel. A similar device has a lower part, which also consists of six sections of five elements each. The leads 13, 14 are soldered to the electrodes of the upper and lower parts, from which the alternating voltage is removed and then goes to the rectifier. The upper and lower parts to increase strength can be glued to the base metal elastic plate 15.

The converter as a whole can rely on supports 16 located at its ends (i.e., at the nodes of the displacements of the oscillating plate) (Fig. 3), or lie tightly on the oscillating plane 17 (Fig. 4). Thus, a bimorph converter can withstand large static and dynamic loads without breaking.

The output voltage of the converter through the matching resistor 2 is fed to the input of the rectifier 3, and then the rectified voltage is fed to the input of the storage capacitor 4. After the storage capacitor through the electronic control circuit 5, the voltage is supplied to the input of the battery 6.

The indicated features of the utility model are significant, i.e. directly affecting the result that can be obtained by carrying out the invention.

The generator operates as follows.

The bimorph converter 1 is attached to a vibrating element of a building, industrial, domestic or road construction. The transducer can be mounted either on supports 16 (Fig. 3), which are placed at the ends of the transducer, in nodal sections, or fit snugly against a vibrating surface (17), for example, to an element of a building structure, or to the floor, or to the roadway. In the first case, the converter can oscillate at the frequency of the main bending resonance under the action of an external exciting force f. The amplitude of the alternating voltage at the output of the converter in this case is maximum. In the second case, the transducer may oscillate at a frequency of the vibrating element, which may not coincide with the resonance frequency of the transducer. In this case, a slightly lower voltage is generated at the output of the converter, but due to close contact with the vibrating surface, a significantly greater converter strength is achieved compared to the previous case. During vibration, as a result of the direct piezoelectric effect, an alternating voltage arises at the output of the converter, which is supplied to resistor 2, and then to rectifier 3. After rectification, the electric charge is accumulated on the storage capacitor 4, then fed to circuit 5, which controls the battery charge. The energy of a charged battery is used by the consumer. Thus, the free energy of vibration of various objects is used.

Technical result achieved:

1. The use of free vibration energy to generate electricity;

2. An increase in the power of the piezoelectric generator;

3. Saving electric energy or its receipt in those places where it is absent.

Claims (3)

1. A piezoelectric generator containing a piezoelectric transducer, in parallel with which is connected a resistor, a rectifier, a storage capacitor and a battery with a charge current regulator, characterized in that the piezoelectric transducer is made in the form of a flat sectioned transducer, the sections of which are electrically connected to each other, and each section consists of from one or more piezoelectric elements glued together and electrically connected to each other. 2. The piezoelectric generator according to claim 1, characterized in that the transducers in each section are connected in series. 3. The piezoelectric generator according to claim 1, characterized in that the transducers in each section are connected in parallel.

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