TWM542801U - Piezoelectric fan driving device - Google Patents

Description

Piezoelectric fan drive

The present invention relates to a driving device, and more particularly to converting a DC power source into an AC power source to drive a piezoelectric fan to operate.

In recent years, due to the rapid development of electronic products, the functions of electronic components have become increasingly powerful, and the volume of electronic components has also been gradually reduced. Therefore, the heat generation of electronic components per unit area is also increasing. The traditional cooling solution uses a heat pipe with a heat sink fin or a temperature equalizing plate, or a heat sink fin with a rotary fan to discharge the generated heat to the outside for heat dissipation.

However, with the pursuit of thinner and more efficient mobile devices such as smart phones and tablets, traditional heat pipes, temperature equalizing plates or fans are no longer available, so a new type of piezoelectric heat sink has appeared on the market. The thickness is only 3~4mm, making the piezoelectric radiator more suitable for mounting on a thinner mobile device than a heat pipe or a fan.

A piezoelectric heat sink mainly includes a connecting member and a two-piezoelectric element fixed to both sides of the connecting member, and a cavity is formed between the two piezoelectric element and the connecting member, and the piezoelectric element is externally applied When the electric field changes, the volume is deformed, and the volume inside the chamber is expanded and contracted, and the cold air is continuously sucked from the outside, and the hot air is extruded out of the radiator to dissipate the heat.

However, the piezoelectric heat sink has the following disadvantages. The connecting member has an opening that communicates with the chamber. Since the piezoelectric heat sink flows through the same opening to inject cold air and extrude hot air, it is easy to generate turbulence in the chamber. As a result, hot air cannot be completely discharged into the chamber, and cold air cannot smoothly flow into the chamber, thereby reducing the heat dissipation efficiency of the piezoelectric heat sink.

Secondly, when a conventional piezoelectric heat sink is used in conjunction with an electronic device, the piezoelectric element requires an alternating current power source to drive the vibration, since most of the electronic devices only provide direct current The source, the DC power supply will not be able to drive the piezoelectric element to operate, so an additional generator must be provided to generate the driving signal to drive the piezoelectric element, which will cause design problems in the integration of the electronic device and the piezoelectric heat sink.

Therefore, the main purpose of the present invention is to add a through hole to the thin film piece or the piezoelectric piece of the piezoelectric element, which uses an opening to allow the inflow of cold air, so that the hot air is discharged through the one-way flow piece on the through hole to avoid cold air and Hot air creates turbulence in the chamber to achieve the heat dissipation efficiency of the boosted voltage radiator.

Another object of the present invention is to provide a driving unit that converts a DC power supply provided by a direct electronic device into an AC power source that can drive a piezoelectric element to operate, thereby confusing the design of the electronic device and the piezoelectric heat sink.

For the above purposes, the present invention provides a piezoelectric fan driving device comprising: a piezoelectric fan and a driving unit. The piezoelectric fan includes a connecting member, two piezoelectric elements and at least one one-way flow-through member. The connecting member has an opening and two end faces. The two piezoelectric elements are fixed to the two end faces, and the connecting member and the two piezoelectric elements enclose a chamber, and one of the piezoelectric elements is provided with a through hole communicating with the chamber. The one-way flow piece is assembled to the through hole. The driving unit is electrically connected to the two piezoelectric elements, converts the DC power source into an AC power source, and drives the two piezoelectric elements to operate by the AC power source.

In one embodiment of the present invention, the one-way flow piece is a one-way restriction diaphragm.

In one embodiment of the present invention, the one-way flow piece is a check valve.

In one embodiment of the present invention, the two piezoelectric elements respectively comprise a film piece and a piezoelectric piece, and the film piece is fixed on the two end faces of the connecting piece, and the piezoelectric piece is fixed to the center of the film. The through hole is provided on the film sheet or the piezoelectric sheet.

In one embodiment of the present invention, the film sheet is a metal sheet or a plastic sheet.

In one embodiment of the present invention, the connecting member has a transverse rod and two straight rods extending from opposite ends of the transverse rod, the opening is disposed between the two straight rods, and the two end surfaces are disposed on the horizontal rod and The upper and lower surfaces of the two straight rods.

In one embodiment of the present invention, the link is U-shaped.

In one embodiment of the present invention, the attachment member is a compression elastomer.

In one embodiment of the present invention, the connecting member is made of rubber or silicone material.

In an embodiment of the present invention, the connecting member has an inwardly recessed recessed portion between the two end faces, the recessed section having a thickness smaller than a thickness of the connecting member.

In one embodiment of the present invention, the connecting member gradually decreases in thickness from the two end faces toward the recessed portion, so that the connecting member has a V-shaped or U-shaped cross section.

In an embodiment of the present invention, the driving unit comprises: a power converter and a power amplifier. The power converter converts the DC power source into the AC power source. The power amplifier is electrically coupled to the power converter and the two piezoelectric elements, and amplifies the AC power output from the power converter to drive the two piezoelectric elements.

10‧‧‧ Piezoelectric fan

1‧‧‧Links

11‧‧‧ openings

12‧‧‧ end face

13‧‧‧ transverse rod

14‧‧‧straight rod

15‧‧‧ recessed section

2‧‧‧Piezoelectric components

S‧‧‧室

21‧‧‧through

22‧‧‧film film

23, 23'‧‧‧ Piezo Pieces

3‧‧‧One-way flow parts

31‧‧‧One-way limiting diaphragm

32‧‧‧ check valve

20‧‧‧Drive unit

201‧‧‧Power Converter

202‧‧‧Power Amplifier

203‧‧‧DC power supply

204‧‧‧AC power supply

1 is an exploded perspective view of a piezoelectric fan driving device according to a first embodiment of the present invention; FIG. 2 is a perspective view showing a combination of a piezoelectric fan driving device according to a first embodiment of the present invention; The circuit block diagram of the driving unit of the creation; FIG. 4 is a schematic diagram of the DC power input waveform of the driving unit of the present invention; FIG. 5 is a schematic diagram of the waveform of the AC power output of the driving unit of the present invention; FIG. A side cross-sectional view of the piezoelectric fan driving device of the embodiment; FIG. 7 is a side cross-sectional view showing the piezoelectric fan driving device of the first embodiment of the present invention; Figure 8 is a perspective view showing the combination of the piezoelectric fan driving device of the second embodiment of the present invention; and Figure 9 is a perspective view showing the combination of the piezoelectric fan driving device of the third embodiment of the present invention.

The technical content and detailed description of this creation are now described as follows:

Please refer to FIG. 1 , FIG. 2 and FIG. 3 , which are circuit block diagrams of the piezoelectric fan driving device according to the first embodiment of the present invention, which are exploded and combined with the stereo and driving unit. As shown in the figure, the piezoelectric fan driving device of the present invention comprises: a piezoelectric fan 10 and a driving unit 20. The driving unit 4 inputs a DC power source, and converts the DC power source into an AC power source to drive the piezoelectric fan 10 to operate.

The piezoelectric fan 10 includes a coupling member 1, two piezoelectric elements 2, and at least one one-way flow-through member 3. The connecting member 1 has a U shape and has an opening 11 and two end faces 12 thereon. The connecting member 1 has a transverse rod 13 and two straight rods 14 extending from opposite ends of the transverse rod 13. The opening 11 is formed between the two straight rods 14, and the two end surfaces 12 are formed on the transverse rod 13 and the two straight portions. To the upper and lower surfaces of the rod 14. In addition, the connecting member 1 is made of a rubber or silicone material, so that the connecting member 1 is a compression type elastic body; or the connecting member 1 has a concave portion 15 between the two end faces 12, and the thickness of the concave portion 15 b is smaller than the thickness a of the connecting member 1 (see FIG. 6). When the connecting member 1 is pressed, the connecting member 1 is easily compressed in the direction of the recessed portion 15, so that the connecting member 1 is a compressible elastic connecting member. When the connecting frame 1 has the recessed section 15, the connecting member 1 gradually decreases in thickness from the two end faces 12 toward the recessed section 15, and the connecting member 1 has a V-shaped or U-shaped cross section.

The two piezoelectric elements 2 are fixed to the two end faces 12 of the connecting member 1. The connecting member 1 and the two piezoelectric elements 2 together define a chamber s. Each of the piezoelectric elements 2 includes a film sheet 22 and a piezoelectric sheet 23 fixed to the two end faces 12 of the connecting member 1. The piezoelectric sheet 23 is fixed to the center of the film sheet 22. And the film sheet 22 is provided with at least one The through hole 21 is connected to the chamber s. However, in practice, the film sheet 22 may be provided with the through hole 21. In the present drawing, the film sheet 22 is a metal sheet or a plastic sheet.

The one-way flow-through member 3 covers the through-hole 21, and the one-way flow-through member 3 is a one-way restricting diaphragm 31 for supplying airflow from the outside through the through-port 21 into the chamber s to restrict the airflow from passing through the chamber s. The through hole 21 flows out of the outside, or the airflow is supplied from the chamber s through the through hole 21 to be discharged to the outside, and the airflow is restricted from flowing into the chamber s through the through hole 21.

The driving unit 20 is electrically connected to the two piezoelectric sheets 23, and after the driving unit 20 inputs a DC power source, the DC power source is converted or simulated into an AC power source (the operating principle of the driving unit 20, which will be described in detail later). The output drives the piezoelectric sheet 23 to vibrate to cause the diaphragm 22 to resonate, so that the airflow can flow into the chamber s from the one-way flow member 3, and is discharged from the opening 11.

Please refer to Figures 3, 4 and 5, which are circuit diagrams of the driving unit of the present driving unit, DC power input waveform and AC power output waveform. As shown in the figure, the driving unit 20 of the present invention includes a power conversion 201 and a power amplification 202.

When a DC power source (shown in FIG. 4) 203 is input to the power converter 201, the power converter 201 converts the DC power source 203 into an AC power source output, and then the converted AC power source is amplified by the power amplifier 202. The required AC power source (shown in FIG. 5) 204 is driven by the amplified AC power source 204 to drive the piezoelectric fan 10.

Please refer to FIGS. 6 and 7 for a side cross-sectional view and a side cross-sectional view of the piezoelectric fan driving device according to the first embodiment of the present invention. As shown in the figure, when the present invention is used in conjunction with an electronic device (not shown), the electronic device supplies DC power through the drive unit 20 to be converted into an AC power source 204 to drive the piezoelectric fan 10.

The two piezoelectric sheets 23 of the piezoelectric fan 10 are vibrated by the application of an alternating current power source, and when the two piezoelectric sheets 23 vibrate, the two thin film sheets 22 are caused to vibrate to make the inside of the chamber s The volume is expanded and contracted, and the cold air is continuously sucked from the outside through the opening 11, and the air is forced out of the piezoelectric fan 10 through the through-hole 21 through the one-way flow member 3, and the piezoelectric fan 10 is The piezoelectric sheet 23 is reciprocated to effectively dissipate heat inside the electronic device.

Since the opening 11 allows cold air to smoothly flow into the chamber s, the hot air is discharged through the one-way flow-through member 3 on the through-hole 21, so that the inflow of cold air and the discharge of the hot air adopt different paths to avoid cold air and heat. Air creates turbulence in the chamber s to achieve improved heat dissipation efficiency.

Please refer to FIG. 8, which is a perspective view showing the combination of the piezoelectric fan driving device of the second embodiment of the present invention. As shown in the figure, the second embodiment is substantially the same as the first embodiment, and the difference is that the one-way flow-through member 3 is a circular check valve 32. The check valve 32 supplies airflow from the outside through the through-port 21 into the chamber s. Therefore, when the piezoelectric sheet 23 drives the diaphragm 22 to vibrate, the external airflow flows into the chamber s through the through-port 21 Then, the air is extruded from the opening 11 to the outside of the piezoelectric fan 10 to achieve effective heat dissipation for the electronic device.

Please refer to FIG. 9, which is a perspective view showing the combination of the piezoelectric fan driving device of the third embodiment of the present invention. As shown, the third embodiment is substantially the same as the first embodiment except that the piezoelectric element 2 does not include the film sheet 22. When the piezoelectric sheet 23' does not include the film sheet 22, a through hole 21 is formed in the piezoelectric sheet 23', and a one-way flow-through member 3 is provided in the through-hole 21. The piezoelectric piece 23' is deformed by a change in an externally applied electric field, and a reciprocating motion of expanding and reducing the volume inside the chamber s causes the opening 11 to suck cold air from the outside, and from the through hole 21 The air is forced out of the piezoelectric fan 10 through the one-way flow-through member 3, or the outside cold air enters the chamber s through the through-hole 21 through the one-way flow member 3, and the air is squeezed out from the opening 11 The electric fan 10 is externally provided for the purpose of effectively dissipating heat from the electronic device.

However, the above description is only a preferred embodiment of the present invention, and it is not intended to limit the scope of patent protection of the present creation. Therefore, the equivalent changes made by using the present specification or the content of the schema are all included in the right of the creation. Within the scope of protection, it is given to Chen Ming.

10‧‧‧ Piezoelectric fan

20‧‧‧Drive unit

201‧‧‧Power Converter

202‧‧‧Power Amplifier

203‧‧‧DC power supply

204‧‧‧AC power supply

Claims (12)

A piezoelectric fan driving device includes: a piezoelectric fan and a driving unit; wherein the piezoelectric fan comprises: a connecting member having an opening and two end faces; and two piezoelectric elements fixed on the two end faces The connecting member and the two piezoelectric element enclose a chamber, and one of the piezoelectric elements is provided with a through hole communicating with the chamber; and at least one one-way flow-through member is assembled The driving unit is electrically connected to the two piezoelectric elements, converts the DC power source into an AC power source, and drives the two piezoelectric elements to operate by the AC power source. The piezoelectric fan driving device of claim 1, wherein the one-way flow-through member is a one-way restricting diaphragm. The piezoelectric fan driving device of claim 1, wherein the one-way flow-through member is a check valve. The piezoelectric fan driving device of claim 1, wherein the two piezoelectric elements each comprise a film piece and a piezoelectric piece, and the film piece is fixed on the two end faces of the connecting piece, The piezoelectric sheet is fixed to a central position of the film sheet, and the through hole is disposed on the film sheet or the piezoelectric sheet. The piezoelectric fan driving device of claim 4, wherein the film sheet is a metal sheet or a plastic sheet. The piezoelectric fan driving device of claim 1, wherein the connecting member has a transverse rod and two straight rods extending from opposite ends of the transverse rod, the opening being disposed on the two straight rods The two end faces are disposed on the upper and lower surfaces of the transverse rod and the two orthogonal rods. The piezoelectric fan driving device of claim 1, wherein the connecting member is U-shaped. The piezoelectric fan driving device of claim 1, wherein the connecting member is a compression type elastic body. The piezoelectric fan driving device according to claim 1, wherein the connecting member is made of a rubber or silicone material. The piezoelectric fan driving device of claim 1, wherein the connecting member has an inwardly recessed recessed portion between the two end faces, the recessed portion having a thickness smaller than a thickness of the connecting member. The piezoelectric fan driving device of claim 1, wherein the connecting member gradually decreases in thickness from the two end faces toward the recessed portion, so that the connecting member has a V-shaped or U-shaped cross section. The piezoelectric fan driving device of claim 1, wherein the driving unit comprises: a power converter for converting the DC power source into the AC power source; and a power amplifier for converting the power source And the two piezoelectric elements are electrically connected, and the AC power source outputted by the power converter is amplified to drive the two piezoelectric elements.