TWI866221B - The piezoelectric transformer of bimorph type - Google Patents

Abstract

A piezoelectric transformer of bimorph type is composed of an input bimorph group, an insulating bonding body and an output bimorph group. Its main feature is: the insulating glue body is arranged between the input dual chip set and the output dual chip set. Wherein, the insulating bonding system is used for bonding the input dual-chip group and the output dual-chip group, and has an insulating effect. The bimorph piezoelectric transformer has good step-up ratio (Vout/Vin) and step-down ratio (Iin/Iout) under the cantilever boundary condition.

Description

Dual-chip piezoelectric transformer

The present invention relates to a piezoelectric transformer, in particular to a bi-chip piezoelectric transformer having both a good step-up ratio (Vout/Vin) and a good step-down ratio (Iin/Iout).

The known I453961 patent particularly describes a bilateral fixed cantilever beam piezoelectric transformer, comprising a bilateral fixed cantilever beam structure, an actuating device, a sensing device, and a resistor. The bilateral fixed cantilever beam structure has a first fixed end and a second fixed end, and the bilateral fixed cantilever beam structure comprises a substrate layer and a piezoelectric layer, wherein the piezoelectric layer has a substrate surface and an outer surface, the substrate surface is attached to the substrate layer, and the two ends of the substrate layer and the piezoelectric material layer are respectively fixed to the first fixed end and the second fixed end. The actuating device is disposed at the first fixed end, the sensing device is disposed at the second fixed end, and the resistor is connected in series with the sensing device.

In addition, patent I389361 refers to a piezoelectric transformer device having a structure in which an upper piezoelectric transformer is loaded on a lower piezoelectric transformer. The lower piezoelectric transformer is mounted on a circuit substrate in a state where the piezoelectric ceramic is contained in a casing. The upper piezoelectric transformer is mounted on a circuit substrate via the lower piezoelectric transformer in a state where the piezoelectric ceramic is contained in a casing. The projection area of the upper piezoelectric transformer projected on the circuit substrate is within the range of the mounting area of the lower piezoelectric transformer occupied by the circuit substrate.

Furthermore, patent I345322 refers to a piezoelectric transformer suitable for connecting a cold cathode tube with a high-voltage, etc., wherein the output portion is polarized in the same direction along the length direction and has high efficiency. The piezoelectric transformer comprises: an input portion having an input electrode stacked in the thickness direction at the center of the length direction of a rectangular piezoelectric body; a pair of output portions arranged in the length direction in a manner of sandwiching the input portion; and output electrodes arranged at the ends of each output portion; wherein the input portion is polarized in the thickness direction between the input electrodes, and the output portion is polarized in the same direction along the length direction and operates in a half-wave mode; if the length of the piezoelectric body in the length direction is L1, the length of the input portion in the length direction is L2, and the length of the output electrode on either side in the length direction is L3, L1, L2 and L3 satisfy the relationship of 0.1≦(4L2-L3)/4L1≦0.5.

Finally, patent I242901 refers to a piezoelectric transformer with a high step-up ratio, which adopts a two-way tapered trapezoidal plate shape, allowing the voltage to be input from one end of the panel to be gradually widened, so that the input voltage is converted into a high actuation force, and then the high actuation force is used to drive the right half of the trapezoidal plate. Through the drive of the high actuation force, a high voltage is output from the tapered end, thereby achieving a piezoelectric transformer with a high output voltage ratio.

The above-mentioned known technology or piezoelectric transformer is different from the present invention in shape or implementation, technical content, main features, composition, expected purpose and effect. In particular, the main function of the known technology is to boost voltage, which is obviously different from the dual-chip piezoelectric transformer described in the present invention, which has both boosting and current reducing functions. Moreover, the known technology still has relative disadvantages such as difficult manufacturing, high cost and difficult assembly.

Since the prior art still has some disadvantages, the present invention hopes to achieve the advantages of easy manufacturing, low cost, easy assembly, and good step-up ratio (Vout/Vin) and current reduction ratio (Iin/Iout) through a bi-chip piezoelectric transformer. The bi-chip piezoelectric transformer is composed of an input bi-chip set, an insulating adhesive body, and an output bi-chip set; its main features and improvements are: an insulating adhesive body is provided between the input bi-chip set and the output bi-chip set; wherein the insulating adhesive body is used to bond the input bi-chip set and the output bi-chip set, and has an insulating effect.

1: Input dual chipset

11: Upper voltage ceramic sheet

111: Polarization direction

12: Conductive glue composite

13: Undervoltage ceramic sheet

131: Polarization direction

2: Insulation glue composite

3: Output dual chipset

31: Upper voltage ceramic sheet

311: Polarization direction

32: Conductive glue composite

33: Downward pressure ceramic sheet

331: Polarization direction

Figure 1 is an exploded view of the present invention.

Figure 2 is an assembly diagram of the present invention.

Figure 3 is a diagram showing the implementation of the present invention.

The following uses Figures 1 to 3 to explain the composition and implementation of the present invention, so that those in the technical field can easily understand the main features of the present invention and the effects or purposes to be achieved.

The present invention is a dual-chip piezoelectric transformer, which is composed of an input dual-chip set 1, an insulating adhesive body 2 and an output dual-chip set 3; its main feature is that the insulating adhesive body 2 is provided between the input dual-chip set 1 and the output dual-chip set 3.

As described above, the bimorph piezoelectric transformer, wherein the input bimorph set 1 is composed of an upper piezoelectric ceramic sheet 11, a conductive adhesive body 12 and a lower piezoelectric ceramic sheet 13, wherein the polarization directions (111 and 131) of the upper piezoelectric ceramic sheet 11 and the lower piezoelectric ceramic sheet 13 are different; the conductive adhesive body 12 is located between the upper piezoelectric ceramic sheet 11 and the lower piezoelectric ceramic sheet 13, and the conductive adhesive body 12 is used to glue the upper piezoelectric ceramic sheet 11 and the lower piezoelectric ceramic sheet 13; the input bimorph set 1 is used for AC voltage or current input.

In addition, in the aforementioned dual-chip piezoelectric transformer, the insulating adhesive 2 is used to bond the input dual-chip set 1 and the output dual-chip set 3, and has an insulating effect.

Furthermore, as described above, the bimorph piezoelectric transformer, wherein the output bimorph set 3 is composed of an upper piezoelectric ceramic sheet 31, a conductive adhesive body 32 and a lower piezoelectric ceramic sheet 33, wherein the polarization directions (311 and 331) of the upper piezoelectric ceramic sheet 31 and the lower piezoelectric ceramic sheet 33 are different; the conductive adhesive body 32 is located between the upper piezoelectric ceramic sheet 31 and the lower piezoelectric ceramic sheet 33, and the conductive adhesive body 32 is used to glue the upper piezoelectric ceramic sheet 31 and the lower piezoelectric ceramic sheet 33; the output bimorph set 3 is used for outputting AC voltage or current.

According to the experimental results, when the size of the upper piezoelectric ceramic sheet 11 is 40mmX10mmX2.5mm, the size of the conductive composite 12 is 50mmX10mmX0.1mm, and the size of the lower piezoelectric ceramic sheet 13 is 40mmX10mmX2.5mm; the size of the insulating composite 2 is 40mmX10mmX0.1mm; and the size of the upper piezoelectric ceramic sheet 31 is 40mmX10mmX2.5mm, and the size of the conductive composite 32 is 50mmX10mmX0. 1mm and the size of the lower voltage ceramic sheet 33 is 40mmX10mmX2.5mm; under the above-mentioned size and free boundary conditions, that is, the two ends of the transformer are free and not fixed, the maximum step-up ratio (Vout/Vin) of the bimorph piezoelectric transformer is 13.6, the maximum step-down ratio (Vin/Vout) is 52.44, the maximum current step-up ratio (Iout/Iin) is 1.87E-3, and the maximum current step-down ratio (Iin/Iout) is 25,677. Under the above-mentioned dimension and cantilever boundary conditions, that is, one end of the transformer is fixed and the other end is not fixed, the maximum step-up ratio (Vout/Vin) of the bimorph piezoelectric transformer is 134, the maximum step-down ratio (Vin/Vout) is 3.25, the maximum step-up ratio (Iout/Iin) is 1.66E-3, and the maximum step-down ratio (Iin/Iout) is 397,250.

This invention has industrial applicability after implementation, and there is no similar device on the market or in patent announcements, which means it is novel; and this invention is easy to manufacture, low cost and easy to assemble, and has good boost ratio (Vout/Vin) and current reduction ratio (Iin/Iout), which means it is also progressive.

1: Input dual chipset

11: Upper voltage ceramic sheet

111: Polarization direction

12: Conductive glue composite

13: Undervoltage ceramic sheet

131: Polarization direction

2: Insulation glue composite

3: Output dual chipset

31: Upper voltage ceramic sheet

311: Polarization direction

32: Conductive glue composite

33: Downward pressure ceramic sheet

331: Polarization direction

Claims (4)

A dual-chip piezoelectric transformer is composed of an input dual-chip set, an insulating composite body and an output dual-chip set; its main feature is that the insulating composite body is provided between the input dual-chip set and the output dual-chip set. As described in item 1 of the patent application scope, the bi-chip type piezoelectric transformer, wherein the input bi-chip set is composed of an upper piezoelectric ceramic sheet, a conductive glue body and a lower piezoelectric ceramic sheet, wherein the polarization directions of the upper piezoelectric ceramic sheet and the lower piezoelectric ceramic sheet are different; the conductive glue body is located between the upper piezoelectric ceramic sheet and the lower piezoelectric ceramic sheet, and the conductive glue body is used to glue the upper piezoelectric ceramic sheet and the lower piezoelectric ceramic sheet; the input bi-chip set is used for AC voltage or current input. As described in item 1 of the patent application scope, the dual-chip piezoelectric transformer, wherein the insulating adhesive is used to glue the input dual-chip set and the output dual-chip set and has an insulating effect. As described in item 1 of the patent application scope, the bi-chip type piezoelectric transformer, wherein the output bi-chip set is composed of an upper piezoelectric ceramic sheet, a conductive adhesive body and a lower piezoelectric ceramic sheet, wherein the polarization directions of the upper piezoelectric ceramic sheet and the lower piezoelectric ceramic sheet are different; the conductive adhesive body is located between the upper piezoelectric ceramic sheet and the lower piezoelectric ceramic sheet, and the conductive adhesive body is used to glue the upper piezoelectric ceramic sheet and the lower piezoelectric ceramic sheet; the output bi-chip set is used for AC voltage or current output.

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