CN104538546A - Radial vibration annular piezoelectric ceramic composite transformer - Google Patents

Abstract

The invention relates to a radial vibration annular piezoelectric ceramic composite transformer which comprises a piezoelectric ceramic inner ring and a piezoelectric ceramic outer ring. A metal conducting ring is coaxially arranged between the piezoelectric ceramic inner ring and the piezoelectric ceramic outer ring, the piezoelectric ceramic inner ring, the piezoelectric ceramic outer ring and the upper end face and the lower end face of the metal conducting ring are placed in the same plane, and the height H of the piezoelectric ceramic inner ring, the height H of the piezoelectric ceramic outer ring and the height H of the metal conducting ring are smaller than or equal to D/6 of the outer diameter of the piezoelectric ceramic outer ring. According to the novel radial vibration annular piezoelectric ceramic composite transformer, the metal circular ring is additionally arranged between an input piezoelectric ceramic device and an output piezoelectric ceramic device, and the effects of improving the radiating of the transformer, enlarging the power capacity of the transformer and improving the electromechanical properties of the transformer can be achieved. Meanwhile, the radial polarized piezoelectric ceramic circular rings are utilized, and the polarization and the excitation orientation of the piezoelectric ceramic circular rings are consistent. The radial vibration annular piezoelectric ceramic composite transformer belongs to a longitudinal effect vibration mode which is similar to a Kt vibration mode, and the electromechanical excitation and conversion efficiency of the piezoelectric ceramic transformer can be improved.

Description

A kind of radial vibration annular piezoelectric Ceramic Composite transformer

Technical field

The invention belongs to composite transformer technical field, particularly a kind of radial vibration annular piezoelectric Ceramic Composite transformer.

Background technology

At present, the approach of traditional rising or reduction alternating voltage utilizes electromagnetic transformers.Electromagnetic transformers forms primarily of iron core and around the coil of iron core.In electromagnetic transformers, primary and secondary coil realizes electromagnetic coupled by magnetic core.In some electric power and great-power electronic application technology, large-scale electromagnetic transformers is very effective.But, along with the development of science and technology and the process of electronics miniaturization start, the efficient components and parts that the many application in electronics industry all need overall dimension less, thus increasing to the demand of small-sized efficient transformer.Due to its intrinsic reason, such as, relaxation loss in the skin effect loss of conductor, the conduction loss of thin wire and magnetic material increases rapidly along with the size reduction of transformer, makes existing electromagnetic transformers be difficult to realize efficient small.At present, electromagnetic transformers has become the maximum electronic device of circuit board upper volume, and one of biggest obstacle becoming electronics miniaturization.In addition, the problems such as the leakage field phenomenon that electromagnetic transformers is intrinsic and electromagnetic radiation all can cause certain pollution for environment, are thus also unfavorable for the requirement of environmental protection.

In order to overcome this problem, realizing the miniaturization of electronic device, there has been proposed the concept of piezoelectric ceramic transformer.Piezoelectric ceramic transformer is substantially intercoupled by two mechanical parts and the piezoelectric ceramic resonator of circuit part mutually insulated (or piezoelectric ceramic transducer and piezoelectric actuator) forms.Piezoelectric ceramic transformer is a kind of novel voltage or current transformation device, and its operation principle is different from traditional electromagnetic transformers.In piezoelectric ceramic transformer, being coupled between elementary and secondary is not the galvanomagnetic effect by traditional, but realize by means of the piezoelectric effect of mechanical couplings and piezoelectric.The concept of piezoelectric ceramic transformer is proposed in 1954 by the Rosen of the U.S., but due to the capacity of heat transmission of piezoceramic material own more weak, therefore usually there is the phenomenons such as piezoelectric ceramic transformer is overheated, thus affect the performance of piezoelectric ceramic transformer.

In addition, in traditional ring-shaped piezo ceramic transformer, piezo ceramic element is all radial polarization substantially, namely along the short transverse of piezoelectric ceramic annulus; The vibration radially direction of annulus simultaneously, now the mode of oscillation of piezoelectric ceramic annulus belongs to the Kp mode of oscillation of horizontal effect.

Summary of the invention

The object of the present invention is to provide a kind of piezoelectric ceramic annulus of radial polarised that utilizes that the polarization of piezoelectric ceramic annulus and excitation orientation are consistent, thus the electromechanics improving piezoelectric ceramic transformer excite and the radial vibration annular piezoelectric Ceramic Composite transformer of conversion efficiency.

To achieve these goals, the technical solution adopted in the present invention comprises piezoelectric ceramic inner ring and the piezoelectric ceramic outer shroud of coaxial setting, metallic conduction ring is provided with between piezoelectric ceramic inner ring and piezoelectric ceramic outer shroud, the upper and lower end face of piezoelectric ceramic inner ring, piezoelectric ceramic outer shroud and metallic conduction ring in same plane, height H≤piezoelectric ceramic outer shroud outer diameter D/6 of piezoelectric ceramic inner ring, piezoelectric ceramic outer shroud and metallic conduction ring.

Above-mentioned metallic conduction ring is any one in aluminium ring, steel loop, copper ring, aluminium alloy or titanium alloy ring, stainless steel ring.

Above-mentioned piezoelectric ceramic outer shroud and piezoelectric ceramic inner ring are all the piezoelectric ceramic rings be made up of emission type piezoelectric energy-conversion material.

Radial vibration annular piezoelectric Ceramic Composite transformer of the present invention is when the inside and outside surface in piezoelectric ceramic inner ring applies an alternating voltage V _itime, by means of inverse piezoelectric effect, mechanical oscillation will be produced near its resonance frequency, simultaneously at its outside surfaces externally and internally exporting piezoelectric ceramic outer shroud, due to direct piezoelectric effect, by the output voltage signal V of generation one with input voltage same frequency _o, thus realize the conversion of voltage or electric current.See Fig. 1, Fig. 1 is the electro-mechanical equivalent circuit of radial vibration annular piezoelectric Ceramic Composite transformer of the present invention, in FIG, the left part of ab line represents the input piezoelectric ceramic ring in composite transformer, i.e. piezoelectric ceramic inner ring, part between ab line and cd line represents metal ring, the right part of cd line represents the output piezoelectric ceramic ring of piezoelectric ceramic transformer, i.e. piezoelectric ceramic outer shroud, therefore, the inside radius a of piezoelectric ceramic inner ring, the inside radius b of metallic conduction ring, the inside radius c of piezoelectric ceramic outer shroud, the outer radius d of piezoelectric ceramic outer shroud and the height h of metallic conduction ring.

When after given material and physical dimension, utilize resonance frequency equation (1) just can design the piezoelectric ceramic transformer of different frequency and different geometrical size, utilize the voltage transformating ratio equation (2) of transformer just can draw the voltage transformating ratio size of composite transformer simultaneously.

Resonance frequency equation of the present invention is formula (1),

$\frac{(N_1^2+\mathrm{\ω}{C}_1{X}_{1m}){\mathrm{\ω}}^2{C}_1^2{X}_{1m}+{\left(\mathrm{\ω}{C}_1\right)}^2{R}_{1m}^2}{{\left({\mathrm{\ω}}^2{C}_1^2{R}_{1m}\right)}^2+{\left({\mathrm{\ω}}^2{C}_1^2{X}_{1m}\right)}^2}=0---\left(1\right)$

Voltage transformating ratio equation is formula (2),

$\frac{V_o}{V_i}=\frac{\frac{\mathrm{j\ω}{C}_1{Z}_{1m}/N_1}{\mathrm{j\ω}{C}_1{Z}_{1m}/{N_1}^2-1}}{\left\{\begin{array}{c}\frac{n_1{N}_2}{n_2}\·\frac{Z_{12}+{n_1}^2{Z}_{2m}}{{n_1}^2{Z}_{2m}}\·\frac{Z_{22}+Z_{3m}}{Z_{3m}}\·\frac{Z_{33}+Z_c}{Z_c}\·\frac{(Z_{13}+Z_{11})(Z_{12}+{n_1}^2{Z}_{2m})+Z_{13}{Z}_{11}}{Z_{11}(Z_{12}+{n_1}^2{Z}_{2m})}\·\\ \frac{(Z_{23}+Z_{21})(Z_{22}+Z_{3m})+Z_{21}{Z}_{23}}{Z_{23}(Z_{22}+Z_{3m})}\·\frac{(Z_{32}+Z_{31})(Z_{33}+Z_c)+Z_{31}{Z}_{32}}{Z_{32}(Z_{33}+Z_c)}\·\frac{1}{-\mathrm{j\ω}{C}_{2}R}\end{array}\right\}}$ Formula (2)

In formula (1) and (2) equation, contain the mode of oscillation information of the material parameter of this radial vibration annular piezoelectric ceramic transformer composition material, physical dimension parameter and transformer.

In (1) formula, ω=2 π f, represent angular frequency, f represents frequency;

N ₁represent the electromechanical conversion coefficient of piezoelectric ceramic transformer input piezoelectric ceramic ring;

C ₁represent input direct capacitance.

Z _1m=R _1m+ jX _1m, represent the equivalent mechanical impedance of the inner surface of input piezoelectric ceramic ring, its expression is,

$Z_{1m}=\frac{Z_{11}{Z}_{13}+(Z_{11}+Z_{13})(Z_{12}+{n_1}^2{Z}_{2m})}{Z_{11}+Z_{12}+{n_1}^2{Z}_{2m}};$

Z _2mrepresent the equivalent mechanical impedance of metallic conduction ring inner surface, its expression formula is,

$Z_{2m}=\frac{Z_{21}{Z}_{23}+(Z_{21}+Z_{23})(Z_{22}+Z_{3m})}{Z_{22}+Z_{23}+Z_{3m}};$

Z _3mrepresent the equivalent mechanical impedance exporting piezoelectric ceramic ring inner surface, its expression formula is,

$Z_{3m}=\frac{1}{{n_2}^2}\·\frac{Z_{31}{Z}_{32}+(Z_{31}+Z_{32})(Z_{33}+Z_c)}{Z_{32}+Z_{33}+Z_c};$

R _1mrepresent the equivalent mechanical resistance of input piezoelectric ceramic ring inner surface;

X _1mrepresent that the equivalent mechanical of input piezoelectric ceramic ring inner surface resists;

Z _crepresent that the reflected resistance exporting piezoelectric ceramic ring resists, its expression formula is,

$Z_c=\frac{{N_2}^2}{{\mathrm{\ω}}^2{C}_2^{2}R-\mathrm{j\ω}{C}_2};$

N ₂represent that piezoelectric ceramic transformer exports the electromechanical conversion coefficient of piezoelectric ceramic ring;

C ₂represent and export direct capacitance; Wherein Z _cin R represent the load impedance of composite transformer;

N ₁and n ₂equivalent Transformer in the electro-mechanical equivalent circuit representing input respectively and export piezoelectric ceramic ring

Conversion ratio;

In addition, Z ₁₁, Z ₁₂, Z ₁₃; Z ₂₁, Z ₂₂, Z ₂₃and Z ₃₁, Z ₃₂, Z ₃₃represent input piezoelectric ceramic ring respectively, the equivalent mechanical impedance of metallic conduction ring and output piezoelectric ceramic ring, its concrete expression formula is,

$Z_{11}=-Z_a\frac{j{b}^2{\mathrm{\χ}}_b^2[J_v\left(\mathrm{kb}\right)Y_{v-1}\left(\mathrm{ka}\right)-J_{v-1}\left(\mathrm{ka}\right)Y_v\left(\mathrm{kb}\right)]}{{\mathrm{\τ}}_1}+\frac{j2\mathrm{\π}{\mathrm{hb}}^2{\mathrm{\χ}}_b^2(b_2-b_{4}v)}{\mathrm{\ω}}+Z_a\frac{\mathrm{jb}{\mathrm{\χ}}_a{\mathrm{\χ}}_b}{\mathrm{\πk}{\mathrm{\τ}}_1}$

$Z_{12}=-Z_b\frac{j{a}^2{\mathrm{\χ}}_b^2[J_v\left(\mathrm{kb}\right)Y_{v-1}\left(\mathrm{kb}\right)-J_{v-1}\left(\mathrm{kb}\right)Y_v\left(\mathrm{ka}\right)]}{{\mathrm{\τ}}_1}+\frac{j2\mathrm{\π}{\mathrm{ha}}^2{\mathrm{\χ}}_b^2(b_{4}v-b_2)}{\mathrm{\ω}}+Z_a\frac{\mathrm{ja}{\mathrm{\χ}}_b{\mathrm{\χ}}_c}{\mathrm{\πk}{\mathrm{\τ}}_1}$

$Z_{13}=-Z_a\frac{\mathrm{jb}{\mathrm{\χ}}_a{\mathrm{\χ}}_b}{\mathrm{\πk}{\mathrm{\τ}}_1}=-Z_a\frac{\mathrm{ja}{\mathrm{\χ}}_a{\mathrm{\χ}}_b}{\mathrm{\πk}{\mathrm{\τ}}_1}$

$\begin{array}{c}{Z}_{21}=j\frac{2Z_c}{\mathrm{\πkb}[J_1\left(\mathrm{kc}\right)Y_1\left(\mathrm{kb}\right)-J_1\left(\mathrm{kb}\right)Y_1\left(\mathrm{kc}\right)]}\×\\ \left[\frac{J_1\left(\mathrm{kc}\right)Y_0\left(\mathrm{kb}\right)-J_0\left(\mathrm{kb}\right)Y_1\left(\mathrm{kc}\right)-J_1\left(\mathrm{kb}\right)Y_0\left(\mathrm{kb}\right)+J_0\left(\mathrm{kb}\right)Y_1\left(\mathrm{kb}\right)}{J_1\left(\mathrm{kb}\right)Y_0\left(\mathrm{kb}\right)-J_0\left(\mathrm{kb}\right)Y_1\left(\mathrm{kb}\right)}\right]\\ -j\frac{2Z_b(1-v)}{\mathrm{\π}{\left(\mathrm{kb}\right)}^2[J_1\left(\mathrm{kb}\right)Y_0\left(\mathrm{kb}\right)-J_0\left(\mathrm{kb}\right)Y_1\left(\mathrm{kb}\right)]}\end{array};$

$\begin{array}{c}{Z}_{22}=j\frac{2Z_b}{\mathrm{\πkb}[J_1\left(\mathrm{kc}\right)Y_1\left(\mathrm{kb}\right)-J_1\left(\mathrm{kb}\right)Y_1\left(\mathrm{kc}\right)]}\×\\ \left[\frac{J_1\left(\mathrm{kb}\right)Y_0\left(\mathrm{kc}\right)-J_0\left(\mathrm{kc}\right)Y_1\left(\mathrm{kb}\right)-J_1\left(\mathrm{kc}\right)Y_0\left(\mathrm{kc}\right)+J_0\left(\mathrm{kc}\right)Y_1\left(\mathrm{kc}\right)}{J_1\left(\mathrm{kc}\right)Y_0\left(\mathrm{kc}\right)-J_0\left(\mathrm{kc}\right)Y_1\left(\mathrm{kc}\right)}\right]\\ +j\frac{2Z_c(1-v)}{\mathrm{\π}{\left(\mathrm{kc}\right)}^2[J_1\left(\mathrm{kc}\right)Y_0\left(\mathrm{kc}\right)-J_0\left(\mathrm{kc}\right)Y_1\left(\mathrm{kc}\right)]}\end{array};$

$Z_{23}=j\frac{2Z_b}{\mathrm{\πkb}[J_1\left(\mathrm{kc}\right)Y_1\left(\mathrm{kb}\right)-J_1\left(\mathrm{kb}\right)Y_1\left(\mathrm{kc}\right)]}=j\frac{2Z_c}{\mathrm{\πkc}[J_1\left(\mathrm{kc}\right)Y_1\left(\mathrm{kb}\right)-J_1\left(\mathrm{kc}\right)Y_1\left(\mathrm{kc}\right)]};$

$Z_{31}=-Z_c\frac{j{b}^2{\mathrm{\χ}}_d^2[J_v\left(\mathrm{kd}\right)Y_{v-1}\left(\mathrm{kc}\right)-J_{v-1}\left(\mathrm{kc}\right)Y_v\left(\mathrm{kd}\right)]}{{\mathrm{\τ}}_1}+\frac{j2\mathrm{\π}{\mathrm{hd}}^2{\mathrm{\χ}}_d^2(b_2-b_{4}v)}{\mathrm{\ω}}+Z_c\frac{\mathrm{jd}{\mathrm{\χ}}_c{\mathrm{\χ}}_d}{\mathrm{\πk}{\mathrm{\τ}}_1}$

$Z_{32}=-Z_d\frac{j{c}^2{\mathrm{\χ}}_d^2[J_v\left(\mathrm{kc}\right)Y_{v-1}\left(\mathrm{kd}\right)-J_{v-1}\left(\mathrm{kd}\right)Y_v\left(\mathrm{kc}\right)]}{{\mathrm{\τ}}_1}+\frac{j2\mathrm{\π}{\mathrm{hc}}^2{\mathrm{\χ}}_d^2(b_{4}v-b_2)}{\mathrm{\ω}}+Z_b\frac{\mathrm{jc}{\mathrm{\χ}}_c{\mathrm{\χ}}_d}{\mathrm{\πk}{\mathrm{\τ}}_1}$

$Z_{33}=-Z_d\frac{\mathrm{jc}{\mathrm{\χ}}_c{\mathrm{\χ}}_d}{\mathrm{\πk}{\mathrm{\τ}}_1}=-Z_c\frac{\mathrm{jd}{\mathrm{\χ}}_c{\mathrm{\χ}}_d}{\mathrm{\πk}{\mathrm{\τ}}_1}$

In addition, above-mentioned various in,

τ ₁＝J _ν(kc)Y _ν(kd)-J _ν(kd)Y _ν(kc)

${\mathrm{\χ}}_c=b_3\{(v-2)s_{-2,v-1}\left(\mathrm{kc}\right)-\frac{[J_{v-1}\left(\mathrm{kc}\right)Y_v\left(\mathrm{kd}\right)-J_v\left(\mathrm{kd}\right)Y_{v-1}\left(\mathrm{kc}\right)]s_{-1,v}\left(\mathrm{kc}\right)}{{\mathrm{\τ}}_1}-\frac{2s_{-1,v}\left(\mathrm{kd}\right)}{\mathrm{\πkb}{\mathrm{\τ}}_1}\}+\frac{b_5}{\mathrm{kc}}$

${\mathrm{\χ}}_d=b_3\{(v-2)s_{-2,v-1}\left(\mathrm{kd}\right)-\frac{[J_{v-1}\left(\mathrm{kd}\right)Y_v\left(\mathrm{kc}\right)-Y_v\left(\mathrm{kc}\right)Y_{v-1}\left(\mathrm{kd}\right)]s_{-1,v}\left(\mathrm{kd}\right)}{{\mathrm{\τ}}_1}-\frac{2s_{-1,v}\left(\mathrm{kc}\right)}{\mathrm{\πkd}{\mathrm{\τ}}_1}\}+\frac{b_5}{\mathrm{kd}}$

$v=\sqrt{b_1/b_4}.$

B ₁, b ₃, b ₄and b ₅some constants;

K represents wave number;

J _ν(kc) Bessel function in special function is represented;

Y _ν(kd) Nuo Yiman function is represented;

S _{-2, v-1}deng expression Lommel function.

Radial vibration annular piezoelectric Ceramic Composite transformer of the present invention has following advantage:

(1) the piezoelectric ceramic annulus of radial polarised is utilized, make the polarization of piezoelectric ceramic annulus and excitation orientation consistent, belong to a kind of mode of oscillation of longitudinal effect, be namely similar to Kt mode of oscillation, the electromechanics that can improve piezoelectric ceramic transformer excites and conversion efficiency.

(2) the novel radial direction vibrating piezoelectric ceramic transformer of the present invention's proposition, a circular metal conducting ring is added between input and output piezoelectric ceramic devices, can play and improve transformer heat radiation, increase the power capacity of transformer, and improve the effect of its electromechanical properties.

(3) by means of the metallic conduction ring in piezoelectric ceramic transformer, the operating frequency of this type of novel piezoelectric ceramic transformer can be changed very easily.

(4) by changing the physical dimension of piezoelectric ceramic transformer, rising or the reduction of input voltage can be realized.Meanwhile, also by the optimal design of transformer physical dimension, effective change of composite transformer voltage transformating ratio can be realized, reaches the object of change in voltage, and which show Theroy of Engineering Design and the method for this type of novel piezoelectric ceramic transformer.Operating frequency, voltage transformating ratio and the effective electro-mechanical couple factor etc. that promptly provide this type of composite transformer can be facilitated by means of this theory.

Accompanying drawing explanation

Fig. 1 is the electro-mechanical equivalent circuit of radial vibration annular piezoelectric Ceramic Composite transformer of the present invention.

Fig. 2 is radial vibration annular piezoelectric Ceramic Composite transformer device structure schematic diagram of the present invention.

Fig. 3 is the vertical view of Fig. 2.

Embodiment

Now in conjunction with the accompanying drawings and embodiments technical scheme of the present invention is further described, but the present invention is not limited only to following enforcement situation.

See Fig. 2 and Fig. 3, radial vibration annular piezoelectric Ceramic Composite transformer of the present invention is connected and composed by piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 and metallic conduction ring 2.

The piezoelectric ceramic inner ring 3 of the present embodiment is circular annuli, in the inwall tight bond of its lateral surface with high-temperature-resistant epoxy resin binding agent and metallic conduction ring 2, the lateral surface of metallic conduction ring 2 in the same way with the inwall tight bond of piezoelectric ceramic outer shroud 1, make conductive metal ring and piezoelectric ceramic inner ring 3, piezoelectric ceramic outer shroud 1 is coaxially arranged, and the height of conductive metal ring and piezoelectric ceramic outer shroud 1, the height of piezoelectric ceramic inner ring 3 is equal, i.e. piezoelectric ceramic inner ring 3, piezoelectric ceramic outer shroud 1 and metallic conduction ring 2 upper, lower surface is in same plane, the inside radius of setting piezoelectric ceramic inner ring 3 is a, the inside radius of metallic conduction ring 2 is b, the inside radius of piezoelectric ceramic outer shroud 1 is c, the outer radius of piezoelectric ceramic outer shroud 1 is d, piezoelectric ceramic inner ring 3, the height of piezoelectric ceramic outer shroud 1 and metallic conduction ring 2 is h.

Concrete engineering examples is see as follows:

Example 1:

A=0.01m, b=0.012m, c=0.02m, d=0.024m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all adopt PZT-4 material to make, and metallic conduction ring 2 material is duralumin, load impedance R=50 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=39.23kHz, fa=39.74kHz, voltage gain is than being M=1.54.

Example 2:

A=0.01m, b=0.012m, c=0.02m, d=0.024m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all adopt PZT-4 material to make, and metallic conduction ring 2 material is duralumin, load impedance R=200 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=39.46kHz, fa=39.97kHz, voltage gain is than being M=1.57.

Example 3:

A=0.01m, b=0.012m, c=0.02m, d=0.026m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all adopt PZT-4 material to make, and metallic conduction ring 2 material is duralumin, load impedance R=50 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=36.02kHz, fa=36.42kHz, voltage gain is than being M=1.69.

Example 4:

A=0.01m, b=0.012m, c=0.02m, d=0.026m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all adopt PZT-4 material to make, and metallic conduction ring 2 material is duralumin, load impedance R=200 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=36.21kHz, fa=36.61kHz, voltage gain is than being M=1.73.

Example 5:

A=0.01m, b=0.013m, c=0.02m, d=0.025m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all PZT-4, and metallic conduction ring 2 material is stainless steel, load impedance R=100 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=41.69kHz, fa=42.01kHz, voltage gain is than being M=2.12.

Example 6:

A=0.01m, b=0.013m, c=0.02m, d=0.025m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all PZT-4, and metallic conduction ring 2 material is stainless steel, load impedance R=300 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=41.69kHz, fa=42.09kHz, voltage gain is than being M=2.15.

Example 7:

A=0.01m, b=0.013m, c=0.02m, d=0.028m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all PZT-4, and metallic conduction ring 2 material is stainless steel, load impedance R=100 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=38.18kHz, fa=38.49kHz, voltage gain is than being M=3.34.

Example 8:

A=0.01m, b=0.013m, c=0.02m, d=0.028m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all PZT-4, and metallic conduction ring 2 material is stainless steel, load impedance R=300 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=38.17kHz, fa=38.48kHz, voltage gain is than being M=3.54.

Example 9:

A=0.01m, b=0.018m, c=0.02m, d=0.022m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all PZT-4, and metallic conduction ring 2 material is copper, load impedance R=10 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=35.25kHz, fa=35.68kHz, voltage gain is than being M=0.99.

Example 10:

A=0.01m, b=0.013m, c=0.02m, d=0.022m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all PZT-4, and metallic conduction ring 2 material is copper, load impedance R=200 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=37.026kHz, fa=37.544kHz, voltage gain is than being M=1.21.

Example 11:

A=0.01m, b=0.013m, c=0.02m, d=0.022m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all PZT-4, and metallic conduction ring 2 material is titanium alloy, load impedance R=50 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=43.763kHz, fa=44.498kHz, voltage gain is than being M=1.403.

Example 12:

A=0.015m, b=0.02m, c=0.028m, d=0.03m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all PZT-4, and metallic conduction ring 2 material is copper, load impedance R=50 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=25.774kHz, fa=26.236kHz, voltage gain is than being M=1.139.

Example 13:

A=0.015m, b=0.02m, c=0.028m, d=0.03m, h=0.005m, piezoelectric ceramic inner ring 3 and piezoelectric ceramic outer shroud 1 are all PZT-4, and metallic conduction ring 2 material is titanium alloy, load impedance R=50 ohm.

Utilize resonance frequency equation formula (1) and voltage gain than formula (2), can show that operating frequency fr and the antiresonant frequency fa of the present embodiment piezoelectric ceramic composite transformer are respectively: fr=30.083kHz, fa=30.739kHz, voltage gain is than being M=1.30.

The metal material that metallic conduction ring 2 of the present invention can adopt aluminium alloy, steel etc. commercially available arbitrarily.The radial thickness of metallic conduction ring 2, piezoelectric ceramic inner ring 3, piezoelectric ceramic outer shroud 1 and axial height etc. all can boost according to reality, step-down needs to adjust; above-described embodiment is only the enforcement situation of part; as long as NM design parameter meets mentality of designing of the present invention; all belong to same design of the present invention, within protection scope of the present invention.

Claims (3)

1. a radial vibration annular piezoelectric Ceramic Composite transformer, it is characterized in that: the piezoelectric ceramic inner ring (3) and the piezoelectric ceramic outer shroud (1) that comprise coaxial setting, metallic conduction ring (2) is provided with between piezoelectric ceramic inner ring (3) and piezoelectric ceramic outer shroud (1), piezoelectric ceramic inner ring (3), piezoelectric ceramic outer shroud (1) and metallic conduction ring (2) upper, lower surface is in same plane, piezoelectric ceramic inner ring (3), height H≤piezoelectric ceramic outer shroud (1) outer diameter D/6 of piezoelectric ceramic outer shroud (1) and metallic conduction ring (2).

2. radial vibration annular piezoelectric Ceramic Composite transformer according to claim 1, is characterized in that: described metallic conduction ring (2) is any one in aluminium ring, steel loop, copper ring, aluminium alloy or titanium alloy ring, stainless steel ring.

3. radial vibration annular piezoelectric Ceramic Composite transformer according to claim 1, is characterized in that: described piezoelectric ceramic outer shroud (1) and piezoelectric ceramic inner ring (3) are all the piezoelectric ceramic rings be made up of emission type piezoelectric energy-conversion material.