WO1996015560A1 - Transformateur ceramique piezo-electrique composite et son procede de fabrication - Google Patents

Transformateur ceramique piezo-electrique composite et son procede de fabrication Download PDF

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Publication number
WO1996015560A1
WO1996015560A1 PCT/CN1995/000089 CN9500089W WO9615560A1 WO 1996015560 A1 WO1996015560 A1 WO 1996015560A1 CN 9500089 W CN9500089 W CN 9500089W WO 9615560 A1 WO9615560 A1 WO 9615560A1
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WIPO (PCT)
Prior art keywords
piezoelectric ceramic
transformer
sheet
piezoelectric
driving
Prior art date
Application number
PCT/CN1995/000089
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English (en)
Chinese (zh)
Inventor
Weiti Deng
Hongyi Li
Original Assignee
Beijing Wide Tech. Electron & Electric Equipment Co. Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN 94117773 external-priority patent/CN1122786A/zh
Priority claimed from CN94117774A external-priority patent/CN1049071C/zh
Priority claimed from CN 94117775 external-priority patent/CN1122968A/zh
Priority claimed from CN95107952.2A external-priority patent/CN1130293A/zh
Priority claimed from CN95107953.0A external-priority patent/CN1130292A/zh
Application filed by Beijing Wide Tech. Electron & Electric Equipment Co. Ltd. filed Critical Beijing Wide Tech. Electron & Electric Equipment Co. Ltd.
Priority to AU38388/95A priority Critical patent/AU3838895A/en
Publication of WO1996015560A1 publication Critical patent/WO1996015560A1/fr

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/40—Piezoelectric or electrostrictive devices with electrical input and electrical output, e.g. functioning as transformers

Definitions

  • the present invention generally relates to a piezoelectric ceramic transformer with a composite structure and a manufacturing method thereof, and more particularly, to a piezoelectric monolithic piezoelectric transformer with a composite monolithic structure and a multilayer piezoelectric ceramic prepared by a bonding method.
  • Transformers and manufacturing methods thereof also involve special materials for producing such piezoelectric ceramic transformers.
  • Common transformers and pulse transformers both transmit signals and achieve "transformation" through magnetic coupling.
  • Ordinary transformers use silicon steel sheets as magnetic cores
  • pulse transformers use high-permeability oxygen-based or beryllium-molybdenum magnetic cores.
  • electronic technology Electronic components have been developed to be light, thin, short, and small.
  • Various integrated circuits, resistors, capacitors and other components have been miniaturized. Only transformers, especially power transformers, still cannot get rid of volume. Large and heavy cores and coils. In fact, the size of the power supply has seriously affected the continued development of many electronic products. For example, the power supply of notebook computers has become a major obstacle to its portability.
  • piezoelectric ceramic transformers are likely to promote the process of power chip sizing from a completely new perspective. Because:
  • Piezoelectric ceramic transformers generally work near their mechanical resonance frequency and are not restricted by the cut-off frequency of magnetic materials. The operating frequency can be greatly increased.
  • piezoelectric ceramic transformers can borrow other mature electronic ceramic production tools Reconstruction of art and production equipment can more conveniently organize industrialized large-scale production.
  • most manufacturers are pursuing high-transformation-ratio piezoelectric ceramic transformers, which are used in high-voltage generators, and pursue small size and high boost ratio. Due to its structural reasons, it cannot be used to convert AC 220 / l 10v 50 / 60Hz to DC several volts to several tens volts.
  • piezoelectric ceramic transformers for AC-DC conversion began to appear, such as Japanese Patent Application Laid-Open No. 4-20206580 by Akio Iwamoto, etc., and Japanese Patent Application Laid-Open No. 4-206581 by Uishihara, etc.
  • Only the piezoelectric ceramic transformer disclosed in "2MHz Power Converter Using Piezo Transformer" has higher conversion efficiency and higher output power density.
  • these ceramic transformers still have many disadvantages.
  • the high-voltage and low-voltage ends can only use the same piezoelectric ceramic material as the insulating layer between the two ends, and this material has a large dielectric constant.
  • the capacitance value can reach the order of nF. Therefore, the insulating layer has a bypass effect on high-frequency high driving voltage without good insulation.
  • the operating frequency is too high, it is difficult to configure a good driving circuit, which results in the disadvantage of low conversion efficiency of the power supply, although the conversion efficiency of the transformer is high.
  • the two ends of the high and low resistance are formed first and then polarized, the polarization is difficult, and the yield is low. Therefore, the piezoelectric ceramic transformer needs to be further improved before it can be put into practical use.
  • piezoelectric ceramic transformers used a single sintered body.
  • the driving end and the power generating end were prepared on the porcelain body. Due to the relatively high dielectric constant of the piezoelectric ceramic material, there was a strong gap between the driving end and the power generating end of the piezoelectric transformer.
  • the electric coupling causes the high-voltage side and the low-voltage side to have large leakage currents that do not meet the insulation requirements; and because of the piezoelectric transformer of a single sintered body, the preparation of the ceramic body is completed at one time, making it impossible to arbitrarily adjust the drive and power generation ends. Layer-to-layer ratio Therefore, transformer changes cannot be adjusted very accurately.
  • a multilayer drive end and a multilayer power generation end must be prepared at the same time.
  • the power generation end and the drive end are made of different materials according to design requirements.
  • the preparation method is compared with that of a monolithic multilayer piezoelectric ceramic transformer. Structurally, the process is difficult.
  • the sintering temperature is generally between 1150-i 3 oo ° c, and some are even higher. It has also been proposed that low-temperature sintering ceramic materials generate glass phases during the sintering process. Liquid phase sintering can be performed by melting and analyzing mass transfer processes, which can reduce the sintering temperature of the material, but these additives are all in the form of low-temperature glass. The individual crystal grains are bound to achieve the purpose of densification of the ceramic body, and a relatively thick grain boundary layer is formed at the grain boundaries at the later stage of sintering. However, due to the existence of these glass phases, the dielectric properties and piezoelectric performance parameters of ceramic materials are greatly reduced.
  • the traditional power supply circuit that converts AC power input to DC power output is inseparable from a circuit composed of a magnetic transformer, a semiconductor rectifier, and the like.
  • Low-transformation-ratio piezoelectric ceramic transformer adopts electric energy-mechanical energy-electric energy conversion method. It has no reverse peak voltage, load protection short circuit, automatic protection cut-off, automatic recovery, high power density. It can be made into chip components to get rid of magnetic cores and wires. Reduced volume and other advantages.
  • the commonly used piezoelectric vibrator drive circuit has its compensation inductor and piezoelectric element working in series, so the working voltage applied to the piezoelectric element is higher, the phase shift and surge current are larger, and the tube loss and reactive power are increased power.
  • the main purpose of the present invention is to overcome the problem of poor insulation of a single sintered body piezoelectric ceramic transformer in the prior art, and to propose a process for transforming a non-single sintered body composite structure piezoelectric ceramic while using a low temperature sintered composite perovskite electronic ceramic material. Improve the dielectric voltage and electrical performance of piezoelectric ceramic transformer materials.
  • the piezoelectric ceramic transformer has high conversion efficiency, but the power conversion efficiency Low problem, the inventor has adopted a special compensation circuit in order to make the inventor's piezoelectric ceramic transformer power supply circuit have higher conversion efficiency.
  • a composite structure piezoelectric ceramic transformer according to the present invention has no less than two driving terminals, one power generating terminal less than the number of driving terminals, and two times as many insulating sheets as the power generating terminals.
  • the piezoelectric ceramic transformers with a multilayer composite structure are laminated on each other in sequence, and the outer surfaces of the first and last driving ends of the transformer are respectively connected with two insulating films.
  • the components can be laminated in the following order: the first driving end, the first insulating sheet, the first power generating end, the second insulating sheet, the second driving end, the third insulating sheet, and the second Power generation end, 4th insulation sheet, 3rd drive end ...
  • the insulating film is located at the outer surfaces of the first driving terminal and the n-th driving terminal.
  • the number of driving terminals is not more than ten.
  • the composite structure piezoelectric ceramic transformer according to the present invention may be welded, bonded or sintered at low temperature between the driving end, the power generating end and the insulating sheet.
  • the driving end is bonded by one to nine piezoelectric ceramic sheets coated with electrodes and polarized Together; the power generating end is bonded together by one to thirty pieces of piezoelectric ceramic sheets coated and polarized.
  • the method for manufacturing the above-mentioned multilayer piezoelectric ceramic transformer includes the following steps:
  • Piezoelectric ceramic sheet molding the required piezoelectric ceramic is processed into a sheet of a desired thickness, and its cross section perpendicular to the axial direction can be circular, regular polygon or rectangular; the driving end and the power generating end can use different piezoelectric Material
  • the electrodes of the piezoelectric ceramic sheet can be produced by a high-temperature method or by electroplating or vacuum coating.
  • the electrodes of the piezoelectric ceramic sheet are flat at both ends in the thickness direction. On the surface; polarizing the prepared piezoelectric ceramic sheet according to the requirements of the piezoelectric material used;
  • Transformer molding arranging the drive end, insulation sheet and power generation end in the order specified by the design, and bonding the transformer to form a transformer;
  • Electrode connection each piece of the driving end is connected in series or in parallel as an input terminal, and each piece of the power generating end is connected in parallel as an output terminal with different output characteristics; the process temperature of the external connection method should be higher than that of the piezoelectric material. The temperature is low ioo e c or more.
  • each of the driving end and the power generating end of the monolith is coated with an external electrode and then polarized. After the requirements are met, the driving end, the power generating end, and the insulating sheet are laminated.
  • the method for manufacturing the composite monolithic piezoelectric ceramic transformer c made of the composite monolithic structure includes the following steps:
  • Diaphragm preparation add piezoelectric ceramic powder to plasticizer which accounts for 10-30% of its weight, and make a uniform thickness on the film forming machine after mixing uniformly;
  • step (4) Drying: Put the billet formed in step (3) into a drying box at a temperature of 8 l). C-120 ° (: drying for 6-48 hours; (5) Debinding: The billet dried in step (4) is put into a kiln for low-temperature and slow-temperature heating to vaporize and discharge the plasticizer. The low temperature is from 100 ° C to 350. C ⁇ ;
  • High temperature sintering The billet treated in step (5) is sintered in an industrial kiln.
  • the material is ordinary pressure sintering, and the sintering temperature is 900.
  • C made of piezoelectric ceramic porcelain body;
  • the outer surfaces of the first and last driving ends are respectively connected to two insulating films;
  • Adhesion, welding, or low-temperature sintering can be used between the drive end, power generation end, and insulation sheet.
  • the composite structure piezoelectric ceramic transformer of the present invention specifically, the multilayer piezoelectric ceramic transformer and the composite monolithic piezoelectric ceramic transformer can both adopt a low-temperature sintered composite perovskite electronic ceramic material, that is, the total weight is 60-99. 7% lead-zirconate titanate containing strontium, niobium, magnesium, nickel ions and 0-10% of the total weight of sodium silicate as a basis, adding 0.1-1% of the total weight of oxidation, 0.
  • the method for manufacturing the low-temperature sintered composite perovskite-type electronic ceramic material of the present invention includes the following steps:
  • step (2) After batching according to the above-mentioned step (1), put it into a heating furnace for pre-firing, and the pre-firing temperature gradually increases from low to 850. C-900 e C, so that the ingredient composition completes the solid phase reaction;
  • step (2) the raw material after calcining is taken out and ground into powder;
  • step (3) the powder after grinding is processed into a shape according to the required shape
  • the formed blank is sintered in a heating furnace.
  • the material is ordinary pressure sintering, and the sintering temperature is 95 (TC-1050 e C), and a composite perovskite-type electronic ceramic material porcelain body is made;
  • Polarization treatment The sintered ceramic part is covered with an external electrode and polarized in a 120 ° C silicone oil at a field strength of 4 kV / mm for 20 minutes, so that the internal domains of the ceramic material are aligned in the direction of the electric field.
  • a power supply circuit of a low-transformation piezoelectric ceramic transformer The power supply is provided with a rectifier and a DC conversion and voltage stabilizing circuit to provide a DC working power source for generating a square wave pulse width modulation generator and a half-bridge output circuit driver.
  • the driver provides a MOSFET driving voltage of the half-bridge power amplifier and functions.
  • the excitation voltage applied to the piezoelectric ceramic is applied to the excitation electrode, and an alternating piezoelectric signal is output from the secondary-side induction electrode of the piezoelectric ceramic, and a DC output is obtained after the rectification, filtering, and voltage stabilization circuit.
  • the output square wave is set as a sine wave and added to the piezoelectric ceramic excitation electrode, and the third and fifth harmonic filter circuits composed of the inductance and capacitance of two series-connected parallel resonant circuits are used to reduce phase shift and reactive power.
  • the compensating inductance coil for the inrush current is connected in parallel with the excitation electrode of the piezoelectric ceramic.
  • FIG. 1 is a schematic structural diagram of a composite structure piezoelectric ceramic transformer according to the present invention
  • FIG. 2 is a schematic cross-sectional view of eight groups of internal electrodes and their bus electrodes of each layer of piezoelectric ceramic sheets at the power generating end in FIG. 1;
  • FIG. 3 is a schematic cross-sectional view of the internal electrodes and the bus electrodes of group B of each layer of the piezoelectric ceramic sheet at the power generating end in FIG. 1;
  • FIG. 5 is a schematic longitudinal sectional view of a first embodiment of a multilayer piezoelectric ceramic transformer of the present invention;
  • FIG. 6 is a schematic longitudinal sectional view of a second embodiment of a multilayer piezoelectric ceramic transformer of the present invention.
  • FIG. 7 is a schematic structural cross-sectional view of a monolithic piezoelectric power generating end according to the present invention
  • FIG. 8 is a process flow diagram of manufacturing a composite monolithic piezoelectric ceramic transformer according to the present invention.
  • FIG. 9 is a manufacturing process flow chart of the low-temperature sintered composite perovskite-type electronic ceramic material of the present invention.
  • FIG. 10 is a schematic block diagram of a power supply circuit of a low-transformation ratio piezoelectric ceramic transformer according to the present invention. The best way to implement the invention
  • the composite structure piezoelectric ceramic transformer of the present invention has more than two driving ends, and one power generating end and one insulating sheet having twice the power generating end than the driving end.
  • nth driving terminal 1n the 2n-1 insulating sheet 2 — 2n-1, the n-th power generation terminal 3-n, the 2n-th insulation sheet 2-2n, and the n + 1th drive terminal 1-n + 1 constitute a piezoelectric ceramic transformer with a multilayer composite structure.
  • n ⁇ 10 for plane expansion vibration mode n is best taken 1 to 4
  • thickness direction vibration mode n is best taken 7-9.
  • the outer surfaces of the first and last drive ends of the transformer are connected to two insulation films 4-a and 4-b, respectively. And the driving end input end electrode is respectively provided.
  • the drive end, power generation end, and insulation sheet can be combined by welding, bonding, or low-temperature sintering.
  • the driving terminals 1-1, 1-2 ⁇ 1-n are all piezoelectric ceramic sheets coated with external electrodes. Each driving end is led out in series or in parallel by a lead-out electrode.
  • the polarization direction P is indicated by the arrow direction.
  • the power generating end, the driving end, and the lead-out electrode of the insulating sheet are all shown by thick solid lines in the figure.
  • the power generating terminals 3-1, 3-2 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ 3-n is a number of piezoelectric ceramic sheets of the same material to form a power generation group, or by the same or different Piezoelectric materials form multiple power generation groups; the internal electrodes 3A6 and 3B6 of each odd-numbered piezoelectric ceramic plate and the internal electrodes 3A5 and 3B5 of each even-numbered sheet are staggered and insulated from each other to form a group A internal power generator.
  • the insulating sheet 2-1, 2-2 shown in FIG. 1 can be an inorganic membrane or a polymer composite membrane, and the surface thereof can be prepared with a driving current and an output current. electrode.
  • the axial cross section of the low-transformation-ratio piezoelectric ceramic transformer is approximately 26 mm in diameter and approximately 6 mm in thickness, and is a sheet-type piezoelectric ceramic transformer using a planar expansion mode.
  • the relationship between input / output stages can be easily changed.
  • the power generating end of the present invention converts stress waves of mechanical vibration into electric charge output, and each power generating unit is made into a multi-layer combination of a certain thickness according to the performance of the optional piezoelectric material and the required voltage and current to form a composite layer. According to requirements, the power generation end can be made into independent units with the same or different voltage and power outputs and compounded.
  • the safety protection function is good and the welding is convenient.
  • the insulation film is used to insulate the driving end electrode from the housing or the mechanical external connection for insulation protection. At the same time, the driving end electrode is led out to a position convenient for welding.
  • the present invention provides a multilayer piezoelectric ceramic transformer as described below.
  • the power generating end and the driving end of the multilayer piezoelectric ceramic transformer according to the present invention are composed of a piezoelectric ceramic sheet, an external electrode, an adhesive layer, and an external wire.
  • the driving end With the driving end as a row, external electrodes were prepared on the piezoelectric ceramic sheets 101 and 102, respectively.
  • the piezoelectric ceramic sheet 101, the adhesive 102 is completed before the polarization, the polarization direction thereof as shown by the arrows, opposite polarization directions of adjacent piezoelectric ceramic sheets. This is for the parallel use of piezoelectric ceramic plates to meet the requirements of different input voltages.
  • Piezoelectric ceramic plate 101, 102 of the driving end is a type A piezoelectric ceramic material, high piezoelectric parameters and high loss under high voltage, its thickness is 0.4-3 mm.
  • the construction method of the power generation terminal is the same as that of the drive terminal.
  • the purpose of the opposite polarization directions of adjacent piezoelectric ceramic plates is to avoid the mutual cancellation of charges, so as to obtain effective output power.
  • the power generating end is composed of five piezoelectric ceramic sheets 301, 302, 303, 304, and 305, of which the class B material 301, 302, 303, 304 has the characteristics of providing a large current and reducing the output impedance; the class C material 305 has a relatively small ⁇ 33 and large d33, which are good for providing higher voltage and higher output impedance. As shown in FIG.
  • the external connection leads the piezoelectric ceramic sheet 3 (31, 302, 303, and 304 in parallel to form an output terminal 1 with a large output current; the external connection leads the C-type piezoelectric ceramic sheet 305 to constitute Output terminal 2 with higher output voltage.
  • the piezoelectric material A constituting the driving end has good piezoelectric characteristics under a high electric field to meet the requirements of high voltage driving.
  • the piezoelectric ceramic plates 101 and 102 of the driving end are drawn in parallel by external wires to form an input terminal, as shown in FIG. .
  • the piezoelectric ceramic pieces of the driving end and the power generating end are combined into a whole through the bonding layers 501, 504, 505, 5 ⁇ 6, and 507; the driving end, the power generating end, and the insulating sheet are combined into a multilayer piezoelectric through the bonding layers 502 and 503. Ceramic transformer.
  • a B-type piezoelectric ceramic sheet having a thickness of 0.4 mm and a C-type piezoelectric ceramic sheet having a thickness of 0.8 mm constitute a dual output terminal.
  • the thickness of the insulating sheet is 0.15mm.
  • the transformer has a vibration mode of plane expansion, in which:
  • the adhesive used was a modified epoxy resin with a curing temperature of 140 ° C.
  • the main parameters of the piezoelectric ceramic transformer made by C are:
  • FIG. 6 is a schematic structural diagram of a multilayer piezoelectric embodiment 2 of the present invention.
  • the same parts as those in FIG. 5 are shown with the same reference numerals, and will not be described in detail.
  • 10x indicates the serial number of the piezoelectric ceramic chip at the driving end
  • 30x indicates the serial number of the power generating terminal
  • 50x indicates the serial number of the bonding layer.
  • the driving end can be composed of 9 pieces of class A piezoelectric ceramic materials with a thickness of 0.4mm.
  • the main parameters are:
  • the power generation terminal consists of 2 "7 pieces of Class B piezoelectric ceramic materials with a thickness of 0.2mm and 2 pieces of Class C piezoelectric ceramic materials with a thickness of 0.5mm.
  • the main parameters of piezoelectric material B are:
  • Class C piezoelectric materials are:
  • the driving end and the power generating end are respectively bonded by a modified epoxy resin, a modified phenolic resin, and the like, and the curing process temperature thereof is 120 ° C / 2 hours or 150 ° C / 2 hours.
  • the two driving ends are respectively bonded to the two ends of the power generating end through insulating sheets 2-1, 2-2, and the piezoelectric ceramic sheets of the two driving ends are led out in parallel by external wires.
  • the power generation terminal is led out in parallel by 27 pieces of B-type piezoelectric ceramic pieces through external wires to constitute a high-power output terminal, and the C-type piezoelectric ceramic piece is drawn out in parallel through external wires to form a voltage output terminal.
  • the vertical axial cross-section has been made into a regular hexagon, its outer circle diameter is 30mm, the driving end is composed of two 9-layer piezoelectric ceramic sheets with a thickness of 0.4mm, and the power generating end is composed of 27 B-type piezoelectric materials.
  • the main parameters are:
  • the advantages and positive effects of the multilayer piezoelectric ceramic transformer of the present invention are: (1) the molding process is simple, and the inter-layer defects are easy to control, which avoids the defect of a single layer after molding in the existing technology causing the overall failure; 2) Multilayer piezoelectric ceramic transformer of the present invention and manufacturing method thereof
  • the present invention overcomes the limitation of material selection caused by the piezoelectric materials that must be sintered in the prior art, and the performance of the present invention is improved; ( 4 ) because Without the internal electrode, the positive effect of the present invention is to avoid the method of providing expensive palladium-silver electrode in the multilayer sintered body of the prior art composite piezoelectric ceramic transformer, which not only simplifies the manufacturing process, but also particularly cheap.
  • FIG. 7 shows the cross-sectional structure of the monolithic piezoelectric body (power generation end).
  • the membranes covered with the internal electrodes are superimposed in a direction opposite to each other, and the lead-out electrodes shown by thick solid lines are used to apply a polarized electric field after the superposition. Shown polarization direction.
  • the composition and polarization of each piezoelectric ceramic plate in the driving end of the composite monolith is also the same as that of the power generating end. This will be further explained in conjunction with the manufacturing process of the composite monolithic piezoelectric ceramic transformer of the present invention.
  • the manufacturing steps of the manufacturing method of the composite monolithic piezoelectric ceramic transformer according to the present invention are as follows:
  • (a) Diaphragm forming The piezoelectric ceramic powder material is added to a plasticizer which accounts for 25% of its weight, and mixed and hooked to form a diaphragm with a thickness of 0.05 to 3.00 mm on a film forming machine.
  • the optimal parameter thickness of the driving end is 0.52 mm and the number of layers is 3 layers;
  • the optimal parameter thickness of the power generating end is 0.35 mm and the number of layers is 9 layers;
  • the high voltage side and low voltage side have large leakage currents and poor insulation performance. It also overcomes the disadvantage that the transformer ratio cannot be adjusted accurately; especially on a single sintered ceramic body, it is necessary to prepare a multilayer drive end and The multi-layer power generation terminal, which is separately prepared from the driving terminal and the power generating terminal of the present invention, is far more difficult than the present invention in terms of process.
  • the product made by the manufacturing method of the composite monolithic piezoelectric ceramic transformer of the present invention achieves a composite monolithic porcelain body that is like a single piece of porcelain after sintering multiple layers, and a piezoelectric ceramic made by this method. Transformer has simple manufacturing process, high manufacturing precision, miniaturization, and low voltage transformation ratio, especially the driving end and power generating end can be made of different piezoelectric materials, which is a prominent improvement for existing piezoelectric ceramic transformers. .
  • the low-temperature sintered composite perovskite electronic ceramic material designed according to the present invention can reduce the sintering temperature, improve the dielectric and piezoelectric properties of the material, and reduce energy consumption during the sintering process.
  • the manufacturing process of the low-temperature sintered composite perovskite electronic ceramic material of the present invention is as follows:
  • 1 'Batching Dosing according to the percentage by weight, first take 60%-99.7% of lead zirconate titanate containing strontium, niobium, magnesium and nickel ions and 0-10% of sodium silicate Based on the composition, after adding a total weight of 0.1 to 10% of cadmium oxide, 0.1 to 10% of manganese dioxide and 0.1 to 10% of cerium oxide, mix well;
  • 5 'Sintering Put the formed billet into a heating furnace for sintering.
  • the material is ordinary pressure sintering, and the sintering temperature is 950'C-1050 e C. It is made into composite perovskite electronic ceramic material;
  • 6 'polarization treatment The sintered ceramic part is covered with an external electrode and polarized in a 120 C silicone oil at a field strength of 4 kV / mm for 20 minutes, so that the internal domains of the ceramic material are aligned in the direction of the electric field.
  • the total weight is 38.85 grams, accounting for 10.9% of the total weight.
  • a ceramic material having a molecular weight of 1 gram was obtained through the process steps shown in FIG. 9. With reference to the above proportions, a ceramic material with a desired weight can be produced.
  • the 4 ingredients' is composed of 317.5 g of lead zirconate titanate containing strontium, niobium, magnesium, and nickel ions, accounting for 89.1% of the total weight; additives Na 2 Si 3 , CdO, Mn0 2 , CeO It weighs 38.85 grams, accounting for 10.9% of the total weight.
  • the main properties of the ceramic material of this embodiment after polarization are as follows:
  • the inventors substituted the aforementioned numerical ranges given by the values of the coefficients to be determined (U, X, Y, Z, W, R, M, N, P) according to the chemical formula of the present invention, and tested The obtained material is sintered at 1050 ° C. According to the selection of different chemical ratios, the main properties of the material after polarization are as follows:
  • Dielectric constant ⁇ 800-3400
  • X8.85 X10 _1 Farad / meter dielectric loss tgS (50-100)
  • Reduced sintering temperature In the present invention, chemical additives are added to the ceramic body during the sintering process to produce a liquid phase component, and liquid phase sintering is performed to reduce the sintering temperature.
  • the chemical composition of the liquid phase components produced by the present invention is perovskite-like, with certain dielectric and piezoelectric properties; in the later stage of sintering, a considerable portion of the added components can Compounded in the main crystalline phase structure to form a composite perovskite type structure, which can better play the role of the main crystalline phase and greatly reduce energy and hair loss.
  • a power supply circuit for a low-transformation piezoelectric ceramic transformer is rid of Magnetic core and coil, select the inverter power amplifier circuit, which works with square wave in pulse width modulation state to reduce tube consumption, and the piezoelectric element works in sine wave mode to reduce reactive power and inrush current .
  • the AC power source 1 is the city power grid AC.
  • Rectifier 2 is composed of two sets of bridge semiconductor rectifiers B1 and B2.
  • the DC conversion and voltage stabilization circuit 3 is a DC working power source for providing the pulse width modulation generator 4 and the driver 5 of the half-bridge output circuit.
  • the driver of the half-bridge output circuit, 5, specifically provides M1, M2, which are the driving voltage of the half-bridge output amplifier MOSFET (metal oxide field effect transistor) 6, 7.
  • MOSFET metal oxide field effect transistor
  • the source S of the MOSFET 6 and the drain D of the MOSFET 7 are connected to form a contact 19 of the bridge, and the half-bridge capacitor 14 and the half-bridge capacitor 15 are connected to form the other contact 20 of the bridge.
  • the contact I 9 is connected to one end of the piezoelectric ceramic excitation electrode 801, and the contact -20 is connected in series with two parallel resonant circuits, that is, a third and fifth harmonic filter circuit composed of an inductor 9, a capacitor 10 and an inductor 11, and a capacitor 12.
  • the square wave output from the half bridge is set as a sine wave and is applied to the other end of the excitation electrode 801 of the piezoelectric ceramic transformer 8.
  • the compensation inductor 13 is connected in parallel with the excitation electrode 801, which compensates the phase shift caused by the electrostatic capacitance of the piezoelectric element, and reduces the total current phase shift and the energy consumption of reactive power and inrush current.
  • the alternating voltage generated by the piezoelectric effect of the secondary-side induction electrode 802 of the piezoelectric ceramic transformer 8 passes through the rectifying and filtering voltage stabilization circuit 16 shown in FIG. 10, and obtains a DC voltage stabilization output 17.
  • the voltage-stabilized feedback signal of this circuit is constituted by a feedback 18 of a photocoupler, and the output square wave of the pulse width modulation generator 4 is modulated to achieve the purpose of voltage stabilization.
  • the advantages of the power supply circuit of the piezoelectric ceramic transformer with low transformation ratio of the present invention are as follows: (1) An inverter power amplifier circuit is designed, and the circuit works with a square wave in a pulse width modulation state to reduce tube consumption. (2) The piezo element works in a sine wave mode because it outputs a half bridge The two sets of parallel resonant circuits of inductors and capacitors whose square wave is set to a sine wave form a third and fifth harmonic filter circuit, so it can reduce reactive power and inrush current.
  • the compensation inductor coil is connected in parallel with the excitation electrode of the piezoelectric ceramic, which compensates the phase shift caused by the electrostatic capacitance of the piezoelectric element, and reduces the total current phase shift and the energy consumption of reactive power and surge current.
  • the magnetic core and the wire coil of the traditional transformer power supply circuit are eliminated, the size of the instrument is reduced, there is no reverse peak voltage, the load short circuit is automatically cut off and automatically restored, and the power density is high.
  • the electric energy-mechanical energy-electric energy conversion method is adopted, and the piezoelectric ceramic transformer can be made into a chip component, and the transformation ratio can be selected.
  • Low-ratio piezoelectric ceramic transformers made of piezoelectric ceramic materials can reduce the size and size of power transformers for high-frequency switching power supplies.
  • the transformer has high power density, high conversion efficiency, no reverse peak voltage, and has the advantages of automatic load short circuit protection, automatic recovery, small size, light weight and so on.
  • Low-transformation-ratio piezoelectric ceramic transformers have high insulation strength, reasonable structural design, good mechanical matching between levels, accurate measurement of electrical external characteristics, and clear correlations, which is convenient for practical applications.
  • AC-DC power converters made of low-transformation piezoelectric ceramic transformers have the advantages of small size, light weight, and ultra-thin type. They are widely used in various computers, communication equipment, instruments, meters and special occasions. Application, the market prospect is broad.
  • a piezoelectric ceramic transformer with a composite structure characterized in that the piezoelectric ceramic transformer has no less than two driving terminals, one power generating terminal less than the number of driving terminals, and two insulation sheets twice in number as the power generating terminals, wherein The components are sequentially stacked on top of each other to form a multilayer composite piezoelectric ceramic transformer, and the outer surfaces of the first and last driving ends of the transformer are respectively connected to two insulating films (4-a, 4-b).
  • the second driving end (1 to 2);
  • the composite structure piezoelectric ceramic transformer according to claim 1 or 2 characterized in that the driving ends are all piezoelectric ceramic sheets coated with external electrodes, and each driving end is led out in series or in parallel by the lead-out electrodes.
  • each of the power generating terminals (3-1, 3-2, ⁇ 3-n) is made of several piezoelectric materials of the same material.
  • the sheets form a power generation group; the inner electrodes (3A6, 3B6) of each odd-numbered piezoelectric ceramic sheet and the inner electrodes (3A5, 3B5) of each even-numbered piezoelectric ceramic sheet are staggered, insulated from each other, and form a bus in the power generation group
  • Electrode (3A2) and inner B bus electrode (3A 1), and inner bus bar electrode (3B2) and inner B bus electrode (3B1) constituting group B of power generation terminal; polarization of adjacent piezoelectric ceramic sheets (3A3, 3B3)
  • the directions (3A4, 3B4) are opposite, and each generating group can be connected in parallel, series or separately.
  • each of the power generating terminals (3-1, 3--2, 3-n) can also be made of different and different piezoelectric The material forms multiple power generation groups.
  • the thin films respectively constitute a plurality of output terminals to meet the requirements of different output characteristics; the electrodes of the piezoelectric ceramic sheets constituting the different output terminals are respectively led out in parallel through external wires.
  • the multilayer piezoelectric ceramic transformer according to claim 10 characterized in that the driving end is made of piezoelectric ceramic sheets of the same material and the same or different thickness, and the electrodes of each piezoelectric ceramic sheet are respectively connected by external wires. Lead out.
  • a method for manufacturing a multilayer piezoelectric ceramic transformer It is characterized by including the following steps:
  • Piezoelectric ceramic sheet forming the required piezoelectric ceramic porcelain body is processed into a sheet of a desired thickness, and the driving end and the power generating end can use different piezoelectric materials;
  • the electrodes of piezoelectric ceramics can be produced by high temperature method or by electroplating and vacuum coating.
  • the electrodes of piezoelectric ceramics are located on the planes at both ends in the thickness direction.
  • a good piezoelectric ceramic sheet is laminated according to the principle of opposite polarization directions, and is bonded to the driving end and the power generating end by an adhesive according to the design requirements.
  • the curing temperature of the adhesive should be much lower than the piezoelectric ceramic material used.
  • Transformer molding the drive end, the insulation sheet and the power generation end are bonded by an adhesive in the order specified by the design to form a transformer;
  • Electrode connection the pieces at the drive end are connected in series or in parallel as input terminals, and the pieces at the power generation end are connected in parallel as output terminals with different output characteristics; the process temperature of the external connection method should be lower than the Curie temperature of the piezoelectric material. 'c or more.
  • a composite monolithic piezoelectric ceramic transformer characterized in that each driving end and power generating end prepared separately have a monolithic structure, and each piezoelectric ceramic body is covered with an external electrode, and meets requirements for driving after being polarized. End, power generation end and insulation sheet for composite assembly.
  • a manufacturing method of a composite monolithic piezoelectric ceramic transformer characterized in that it includes the following steps:
  • Diaphragm preparation (a): Add piezoelectric ceramic powder to plasticizer which accounts for 10-30% of its weight, and make a uniform thickness on the film forming machine after mixing uniformly;
  • Lamination molding (c): The membranes printed with internal electrodes are laminated in opposite directions to reach the number of layers required for the driving end and the power generating end, respectively, and then they are pressed up and down and around the machine All sides are subjected to the pressure of the hook, and pressed into the required body; Drying (d): Put the billet formed in step (c) into a drying box at a temperature of 80. C-120. (: Drying for 6-48 hours;
  • the low temperature is from 100 ° C to 350 ° C. C ⁇ ;
  • High-temperature sintering (e) The billet processed in step (5) is sintered in an industrial kiln.
  • the material is ordinary pressure sintering, and the sintering temperature is 900.
  • C-1150 e C made of piezoelectric ceramic porcelain body;
  • n-th driving end the 2 ⁇ -1 insulating sheet, the ⁇ generating end, the 2 ⁇ insulating sheet, and the ⁇ + 1 driving end, in order to form a composite structure piezoelectric ceramic transformer. Its first The outer surfaces of the first and last driving ends are connected to two insulating films respectively;
  • Adhesion, welding, or low-temperature sintering may be used between the driving end, the power generating end, and the insulating sheet.
  • a method for manufacturing a low-temperature sintered composite perovskite-type electronic ceramic material comprising the following steps:
  • Polarization treatment (6 '): The sintered ceramic part is covered with an external electrode at 120 °.
  • the C silicone oil was polarized at a field strength of 4 kV / mm for 20 minutes, so that the electric domains in the ceramic material were aligned in the direction of the electric field.
  • the driver (5) provides a half-bridge power amplifier (6, 7). The driving voltage of the MOSFET is generated, and the excitation voltage applied to the piezoelectric ceramic (8) is added to the excitation electrode (801), and the output alternating piezoelectric signal is generated from the secondary end induction electrode (8G2) of the piezoelectric ceramic (8).
  • the rectifying, filtering and stabilizing circuit (16) obtains a DC output (17), which is characterized in that the square wave output from the half bridge is set to a sine wave and added to the piezoelectric ceramic excitation electrode (801).
  • the wire coil (13) is connected in parallel with the excitation electrode (801) of the piezoelectric ceramic (8) .

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

Transformateur céramique piézo-électrique composite comportant au moins deux éléments attaqués, des éléments générateurs dont le nombre est égal à celui des éléments attaqués, moins un, et des feuilles isolantes deux fois plus nombreuses que les éléments générateurs. Ces éléments sont stratifiés dans l'ordre suivant: élément attaqué, feuille isolante, élément générateur, feuille isolante, et ainsi de suite. Des films isolants sont prévus sur les faces externes des premier et dernier éléments attaqués. Ce transformateur céramique piézo-électrique présente une structure à pastilles frittées multiples qui peut être monolithique-composite ou multicouche-collée. L'isolation de couplage du transformateur peut être perfectionnée et on peut réaliser une conversion d'abaissement de la tension du courant d'alimentation.
PCT/CN1995/000089 1994-11-10 1995-11-07 Transformateur ceramique piezo-electrique composite et son procede de fabrication WO1996015560A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU38388/95A AU3838895A (en) 1994-11-10 1995-11-07 Composite piezoelectric ceramic transformer and manufacture method thereof

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
CN94117775.0 1994-11-10
CN94117774.2 1994-11-10
CN 94117773 CN1122786A (zh) 1994-11-10 1994-11-10 低温烧结复合钙钛矿型电子陶瓷材料及其工艺
CN94117774A CN1049071C (zh) 1994-11-10 1994-11-10 复合结构压电陶瓷变压器
CN 94117775 CN1122968A (zh) 1994-11-10 1994-11-10 低变比压电陶瓷变压器的电源电路
CN94117773.4 1994-11-10
CN95107952.2A CN1130293A (zh) 1995-08-04 1995-08-04 复合独石结构压电陶瓷变压器制作方法
CN95107952.2 1995-08-04
CN95107953.0 1995-08-04
CN95107953.0A CN1130292A (zh) 1995-08-04 1995-08-04 多层压电陶瓷变压器及其制作方法

Publications (1)

Publication Number Publication Date
WO1996015560A1 true WO1996015560A1 (fr) 1996-05-23

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WO (1) WO1996015560A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1025596A1 (fr) * 1997-05-27 2000-08-09 Richard Patten Bishop Transformateur piezo-electrique multicouche
JP2003501810A (ja) * 1999-06-01 2003-01-14 リ、ホンギ 拡張振動式の多出力復合構造の圧電トランス
CN100539229C (zh) * 2004-05-19 2009-09-09 中国科学院上海硅酸盐研究所 多层片状压电陶瓷自耦合式降压变压器及其制作方法
WO2011032769A1 (fr) * 2009-09-18 2011-03-24 Robert Bosch Gmbh Transformateur piézoélectrique présentant une structure d'électrodes internes multifonctionnelle
CN112951976A (zh) * 2021-02-05 2021-06-11 江西欧迈斯微电子有限公司 压电材料的极化方法、压电组件及无电极超声波发射装置
CN113852292A (zh) * 2021-08-09 2021-12-28 大连理工大学 一种压电陶瓷-基体一体化驱动器
CN115259838A (zh) * 2022-08-19 2022-11-01 中船重工海声科技有限公司 一种扭转振动晶环及其制作方法
CN115490516A (zh) * 2022-08-29 2022-12-20 温州大学 用压电陶瓷快速固相反应法形成压电陶瓷粉末的方法及制造复合橡胶隔振***的方法及应用
CN116813338A (zh) * 2023-07-06 2023-09-29 景德镇汉方精密电子有限公司 一种压电陶瓷材料及其制备方法与用途

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US5329200A (en) * 1992-07-17 1994-07-12 Nec Corporation Piezoelectric transformer converter for power use
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CN1037426A (zh) * 1988-02-06 1989-11-22 清华大学 低温烧结的含铅系压电陶瓷及其制造工艺
US5118982A (en) * 1989-05-31 1992-06-02 Nec Corporation Thickness mode vibration piezoelectric transformer
CN1061111A (zh) * 1990-10-29 1992-05-13 湖北大学 一种大功率压电陶瓷材料
JPH05137323A (ja) * 1991-11-13 1993-06-01 Fujitsu Ltd 圧電トランス
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EP0665600A1 (fr) * 1994-01-27 1995-08-02 Hitachi Metals, Ltd. Appareil pour alimenter une lampe à décharge et transformateur piézoélectrique associé

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1025596A1 (fr) * 1997-05-27 2000-08-09 Richard Patten Bishop Transformateur piezo-electrique multicouche
EP1025596A4 (fr) * 1997-05-27 2006-05-31 Richard Patten Bishop Transformateur piezo-electrique multicouche
JP2003501810A (ja) * 1999-06-01 2003-01-14 リ、ホンギ 拡張振動式の多出力復合構造の圧電トランス
CN100539229C (zh) * 2004-05-19 2009-09-09 中国科学院上海硅酸盐研究所 多层片状压电陶瓷自耦合式降压变压器及其制作方法
WO2011032769A1 (fr) * 2009-09-18 2011-03-24 Robert Bosch Gmbh Transformateur piézoélectrique présentant une structure d'électrodes internes multifonctionnelle
CN112951976A (zh) * 2021-02-05 2021-06-11 江西欧迈斯微电子有限公司 压电材料的极化方法、压电组件及无电极超声波发射装置
CN113852292A (zh) * 2021-08-09 2021-12-28 大连理工大学 一种压电陶瓷-基体一体化驱动器
CN115259838A (zh) * 2022-08-19 2022-11-01 中船重工海声科技有限公司 一种扭转振动晶环及其制作方法
CN115259838B (zh) * 2022-08-19 2023-10-20 中船重工海声科技有限公司 一种扭转振动晶环及其制作方法
CN115490516A (zh) * 2022-08-29 2022-12-20 温州大学 用压电陶瓷快速固相反应法形成压电陶瓷粉末的方法及制造复合橡胶隔振***的方法及应用
CN115490516B (zh) * 2022-08-29 2023-10-20 温州大学 用压电陶瓷快速固相反应法形成压电陶瓷粉末的方法及制造复合橡胶隔振***的方法及应用
CN116813338A (zh) * 2023-07-06 2023-09-29 景德镇汉方精密电子有限公司 一种压电陶瓷材料及其制备方法与用途

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