CN1604354A - Polarity interleaving type piezo-electric ceramic transformer having reversed phase twin-output - Google Patents
Polarity interleaving type piezo-electric ceramic transformer having reversed phase twin-output Download PDFInfo
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- CN1604354A CN1604354A CN 200410073220 CN200410073220A CN1604354A CN 1604354 A CN1604354 A CN 1604354A CN 200410073220 CN200410073220 CN 200410073220 CN 200410073220 A CN200410073220 A CN 200410073220A CN 1604354 A CN1604354 A CN 1604354A
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Abstract
This invention discloses a piezoelectricity ceramics transformer with a cross polarity and anti-phase double output, which divides the rectangular piezoelectricity area along its length direction into three sections, wherein the first one is the drive area composed of two drive terminals with plane electrode coated on their surfaces; the remain two are output electricity-generating areas with electrode coated on their output ends along their length direction.
Description
Technical field
The present invention relates to a kind of anti-phase dual output polarity interleaving type piezo-electric ceramic transformer that has, specifically, relate to a kind of all-wave vibration mode (λ pattern) or 1.5 times of ripple vibration modes (3 λ/2 patterns) of working in, and will import to drive and divide into two drive ends and polarize, by the design of interior electrode pattern or polarization process and external circuit connected mode, one group of voltage signal that these piezoelectric ceramic transformer two outputs are exported is inverting each other.The invention belongs to electronic technology field.
Background technology
Piezoelectric ceramic transformer in twentieth century beginning of the sixties by the United States Patent (USP) (patent No.: announce that 2974296) as the element of CCFL back light system among the LCD, the booster type piezoelectric ceramic transformer is subjected to paying close attention to nearly in recent years once more.
Along with the development of IT industry, widescreen, highlighted LCD display obtained flourishing exhibition in recent years, and the liquid crystal TV of be effectively applied to 15.0 ", 17.0 ", the above size of 19.0 " notebook computers and 25.0 ".Use based on these, need piezoelectric ceramic transformer to have higher power density and load characteristic to increase the brightness of LCD display.Can change law with transducer: E=1/2 (mv
2) or E=α F
rv
2Know: adopt the method that improves piezoelectric ceramic transformer operating frequency (promptly adopt and reduce size lifting efficient) can promote the power density of its unit mass.But because the characteristic of CCFL, the lifting of operating frequency is very limited.Most of CCFL manufacturings commercial city is limited in the operating frequency of its products C CFL in the scope that is not more than 80～90kHz.And because reducing of size makes the power of transformer descend to some extent.For high power piezoelectric ceramic transformer, because power is bigger, thereby overall dimensions also big (especially length direction), enough output voltage driving CCFL so just can be provided
Yet the increase of lengthwise dimension also makes the resonance frequency of piezoelectric ceramic transformer reduce
This just is difficult to be complementary with CCFL.
In addition.Along with the needs of widescreen, supertwist, the length of straight shape CCFL rises to 1500mm by the 750mm of original main flow; The also spreading degree of U-shaped CCFL is greater than 500mm at least.Thereby the voltage of bursting of CCFL at least should be greater than 3500V
RmsThe utilization of supertwist need could be satisfied brightness greater than 1000cd/m with many (at least 8) CCFL
2Requirement.
Say that from circuit structure height is burst or high working voltage will make the security feature of whole system and EMC become severe, especially the problem of EMC.
In order to start the bigger high resistant feature CCFL of length, in the piezoelectric ceramic transformer design, must increase volume (especially length direction) to obtain enough step-up ratios.Because the restriction of power density, piezoelectric ceramic transformer of general at present employing drives a CCFL, and many lamps technology makes backlight electric power entire system cost soaring significantly.
At present: piezoelectric ceramic transformer commonly used mainly contains two kinds of Rosen type piezoelectric ceramic transformer and Center type piezoelectric ceramic transformers
As shown in Figure 1, Rosen type piezoelectric ceramic transformer be a rectangular piezoelectric body is equally divided into about two and half districts; Left half-court 103 drives the district for input, and its upper and lower surface scribbles electrode 102, and polarizes along thickness direction; Right half-court 104 is output generating district, and its termination scribbles electrode 101, and polarization along its length.The Rosen type piezoelectric ceramic transformer of this structure mainly contains λ/2 and two kinds of operational vibration patterns of λ, the vibration frequency of piezoelectric ceramic transformer is high more in the practical application, its loss is big more, therefore, Rosen type piezoelectric ceramic transformer generally all is operated in λ/2 vibration modes.When it works in λ/2 vibration modes, has only a node and in the piezoelectric ceramic transformer center.The advantage of Rosen type piezoelectric ceramic transformer is: manufacture craft is simple.Its shortcoming is: the input phase angle is big, and step-up ratio is low, and conversion efficiency is low, and inconvenience is installed.
Shown in Figure 2, Center type piezoelectric ceramic transformer is that a rectangular piezoelectric body is divided into three districts; Mesozone 105 drives the district for input, and its upper and lower surface scribbles electrode 110, and polarizes along thickness direction; Both sides are output generating district 106 and 107, and their termination all scribbles electrode 109,108, and polarization in opposite directions along its length, two output generating plot structure symmetries, phase place homophase.Mostly be in actual use and connect use to obtain higher step-up ratio.Center type piezoelectric ceramic transformer mainly contains the operational vibration pattern of λ/2 and two kinds of actual use value of λ.When it works in λ/2 operational vibration patterns, has only a node and in the piezoelectric ceramic transformer center, the advantage of Center type piezoelectric ceramic transformer is: step-up ratio is higher.Its shortcoming is: complex manufacturing technology, and the manufacturing cost height requires highly to two generating district's degrees of balance, and power density is less, and general work has only a node when λ/2 vibration modes, inconvenience is installed.
Summary of the invention
Existing piezoelectric ceramic transformer power density is little, step-up ratio is low in order to overcome, the real work pattern has only a node, the defective of the fixedly inconvenience of piezoelectric ceramic transformer.It is big to the purpose of this invention is to provide a kind of power density, two or three of step-up ratio height, vibration nodal points, the piezoelectric ceramic transformer convenient fixing, input has staggered polarity, output has the reverse voltage signal, makes the magnitude of voltage of bursting or keeping CCFL be decreased to normal value half or more a kind of novel polarity interleaving type piezo-electric ceramic transformer with anti-phase dual output.
To achieve these goals, the present invention by the following technical solutions: by the selection of electrode pattern design in the piezoelectric ceramic transformer, external circuit connection and polarization process, realize the voltage signal of one group of anti-phase output of output.Invented the staggered polarity type piezoelectric ceramic transformer of anti-phase dual output,
This piezoelectric ceramic transformer is made by rectangular piezoelectric body, alongst rectangular piezoelectric body is divided into three districts, first district drives the district for input, is scribbled plane electrode and is formed along two drive ends of thickness direction polarization by upper and lower surface, and its driving polarity is opposite or identical.All the other two districts scribble electrode, polarization along its length for output generating district, two output termination.
Described anti-phase dual output polarity interleaving type piezo-electric ceramic transformer by forming the adjusting that input drives two drive ends in district and output generating section length ratio, can work in all-wave pattern (λ pattern) and 1.5 times of wave modes (3 λ/2 patterns).
The rectangular piezoelectric body of described anti-phase dual output polarity interleaving type piezo-electric ceramic transformer is formed by stacking by a plurality of individual layer piezoelectrics, promptly has sandwich construction.
Each floor that the input of described anti-phase dual output polarity interleaving type piezo-electric ceramic transformer drives the district polarizes along thickness direction, and face mutually two-layerly have opposite polarity.Same one deck that two input drive ends face along its length mutually has the polarity of (or identical) on the contrary.
Two each individual layer piezoelectrics of output generating district polarization in opposite directions along its length of described anti-phase dual output polarity interleaving type piezo-electric ceramic transformer.
Each individual layer piezoelectrics polarization in opposite directions along its length of two generating ends in two output generating districts of described anti-phase dual output polarity interleaving type piezo-electric ceramic transformer, two generating end output voltages are anti-phase.
The present invention have heating less, the step-up ratio height, power density is big, conversion efficiency is high, can reduce significantly because high voltage electric field, installation aspect and the reliability advantages of higher of the unfavorable system works that high starting voltage produces.This piezoelectric transformer has overcome high-power, the application of the piezoelectric ceramic transformer of high voltage ratio and the difficult point of design are widely used in driving in high voltage source, the big screen LCD (LCD) in the backlight electric power of high length-diameter ratio cathode fluorescent tube (CCFL).
Description of drawings
Fig. 1 is known Rosen type piezoelectric ceramic transformer length direction view;
Fig. 2 is known Center type piezoelectric ceramic transformer length direction view;
Fig. 3 for the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer of the present invention external circuit with the be connected length direction view of implementation scheme of 0 ° of phase place;
Fig. 4 for the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer of the present invention external circuit with the be connected length direction view of implementation scheme of 180 ° of phase places;
Fig. 5 is the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer of a present invention multilayer internal and external electrode structural representation;
Stress-strain curve when Fig. 6 is the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer of the present invention resonance;
Fig. 7 drives two drive ends in district with 0 ° of phase place and external circuit connection layout and transformer driving district polarity schematic diagram for the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer input of the present invention;
Fig. 8 drives two drive ends in district with 180 ° of phase places and external circuit connection layout and transformer driving district polarity schematic diagram for the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer input of the present invention;
Fig. 9 is staggered two the generating end load circuit connection layouts with 0 ° of phase place piezoelectric ceramic transformer of the anti-phase dual output polarity of the present invention;
Figure 10 is staggered two the generating end load circuit connection layouts with 180 ° of phase place piezoelectric ceramic transformers of the anti-phase dual output polarity of the present invention;
Figure 11 is the drive circuit block diagram of the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer of the present invention;
Figure 12 connects the connection diagram of many CCFL for the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer of the present invention;
Figure 13 is the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer of the present invention (TPAPT) and ROSEN type, practical 50 * 8 * 3.2mm of center driven type (Center drive)
3Piezoelectric ceramic transformer, difference bringing onto load (R during with input
L=100K Ω) the output voltage effective value graph of a relation the time;
Figure 14 is the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer of the present invention (TPAPT) and ROSEN type, practical 50 * 8 * 3.2mm of center driven type (Center drive)
3Piezoelectric ceramic transformer, difference bringing onto load (R during with input
L=100K Ω) the step-up ratio graph of a relation the time;
Figure 15 is the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer of the present invention (TPAPT) and ROSEN type, practical 50 * 8 * 3.2mm of center driven type (Center drive)
3Piezoelectric ceramic transformer, difference bringing onto load (R during with input
L=100K Ω) the power output graph of a relation the time;
Figure 16 is the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer of the present invention (TPAPT) and ROSEN type, practical 50 * 8 * 3.2mm of center driven type (Center drive)
3Piezoelectric ceramic transformer, difference bringing onto load (R during with input
L=100K Ω) the conversion efficiency graph of a relation the time.
Embodiment
Most important characteristic of the present invention is one group of anti-phase voltage signal of output on a piezoelectric ceramic transformer, thereby realize the anti-phase output of voltage, reduce the voltage effective value that drives CCFL, be adapted to drive one or many CCFL of high length-diameter ratio, reach the high-power applications of piezoelectric ceramic transformer.In order to reach the purpose of anti-phase output, adopt following execution mode.
As shown in Figure 3, Figure 4, anti-phase dual output polarity interleaving type piezo-electric ceramic transformer disclosed by the invention is that a rectangular piezoelectric body is divided into three districts; The mesozone drives district's (being made up of two drive ends) for input, and left and right two districts are output generating district.
Fig. 3, Figure 4 shows that the length direction view of anti-phase dual output polarity interleaving type piezo-electric ceramic transformer.
Figure 5 shows that anti-phase dual output polarity interleaving type piezo-electric ceramic transformer multilayer internal and external electrode structure chart disclosed by the invention, wherein 219,220 is electrode structure in the multilayer, 211 and 212 is two drive ends in the input driving district of rectangular piezoelectric body 210, and 213 and 214 are respectively the outputs generating district of rectangular piezoelectric body 210.
Staggered interior electrode 219a, 219b, 220a, the 220b of each drive end draws with the electricity parallel connection by external electrode 215,216 and 217,218 separately.Output electrode 221,222 lays respectively at the termination in described output generating district 213,214.
Interior electrode constitutes with Ag-Pd, Pd or other conductor pastes usually.External electrode 215,216,217,218 and output electrode 221,222 constitute with the Ag slurry usually.Input drives the district along the thickness direction polarization, and that faces mutually two-layerly has opposite polarity.Two same one decks of facing mutually along its length of input drive end have on the contrary the polarity of (external circuit is connected mutually with 0 °) or identical (external circuit is connected mutually with 180 °).Output is polarization in opposite directions along its length.
Input drives centre and the left-right symmetric position that district 211,212 occupies the rectangular piezoelectric body length L jointly; Output generating district 213,214 occupies the how much symmetrical length in rectangular piezoelectric body 210 (L) two ends.
200,201 is the electrode protective membrane of rectangular piezoelectric body 210 upper and lower surfaces, burns altogether with interior electrode to be one.
Load-deformation curve when Figure 6 shows that rectangular piezoelectric body resonance.Be easy to find out: two drive ends have opposite strain conditions.I.e. 212 but expansions when 211 compressions of input drive end, vice versa.By the continuity of standing wave as can be known: it constitutes a vibration mode with all-wave resonance by two half-wave fundamental resonances, and one group of signal inversion with two drive end outputs gets final product primordial resonance frequently, but drive end has only one words (as Fig. 1 or shown in Figure 2), though can realize the frequency response of high order by the structure of electrode, but when carrying out resonance, the frequency response of high order does not have actual using value than fundamental frequency.
At anti-phase dual output polarity interleaving type piezo-electric ceramic transformer involved in the present invention, can work in all-wave pattern (λ pattern) and 1.5 times of wave modes (3 λ/2 patterns).Same one deck that input drives two input drive ends (facing mutually along its length) in district has opposite or identical polarity, as shown in Figure 3, Figure 4.In addition, as Fig. 7, Fig. 8 and Fig. 9, shown in Figure 10: two pairs of external electrodes 215,217 and 216,218 of occuping the input homonymy can be inserted on the high frequency input source with the phase place of 0 ° or the 180 ° back that is connected with each other respectively.As shown in Figure 6: because of working in the all-wave pattern, this piezoelectric ceramic transformer has two nodes, and than two kinds of form piezoelectric ceramic transformers of Fig. 1, Fig. 2, more convenient, reliable as fixing of components and parts.
Figure 11 drives the circuit block diagram of CCFL for using piezoelectric transformer involved in the present invention: input direct voltage is converted into the interchange high frequency input voltage that is adapted to piezoelectric ceramic transformer by high frequency generation circuit.Be that drive circuit also comprises switching transistor, control chip, the feedback control circuit that is used to control output current, inductance input matching network etc. usually.The high frequency sinusoidal input signal loads on the input drive end of piezoelectric transformer, and drive circuit is inserted in input drive end 215,216 and 217,218 phase places with 0 ° or the 180 ° back that is connected with each other.Arbitrary CCFL is connected in output electrode 221 or 222, and is used for FEEDBACK CONTROL by a coupling resistance r.
Example of the present invention
Be used for 30 " backlight electric power of LCD (Inverter), this piezoelectric ceramic transformer is of a size of 50 * 8 * 2.6mm according to above-mentioned anti-phase dual output polarity interleaving type piezo-electric ceramic transformer structural design actual fabrication is a kind of
3Input drives the district and adopted for 13 stacked adding formed, and interior electrode adopts the Ag-Pd slurry; Piezoelectric ceramic transformer preparation technology is: curtain coating-superimposition printing-common multilayer monolith metallization processes of burning.Output and external electrode adopt Ag, polarize in air.Its resonance frequency is 65kHz.Load is that (two CCFL of Φ * L), the tube current of fluorescent tube and tube voltage are respectively and are 5.5mA, 1400V 2.6 * 650mm after tested
Rms, promptly every tubes distributes the power of 7.7W, and transformer amounts to the 15.4W power output, this moment, conversion efficiency was greater than 96%, when 19 ℃ of ambient temperatures, recorded 42 ℃ of transformer node temperatures with Infrared Detectors, CCFL adopts FEEDBACK CONTROL, does not see flicker, working stability, satisfies actual requirement.
Figure 13, Figure 14 shows that 10.0～16.0V
RmsInput, each specification output voltage V out (Vp-p) and step-up ratio graph of a relation of measuring respectively during load RL=100K Ω, as seen from the figure: TPAPT type step-up ratio is very high, and this is that Rosen type piezoelectric ceramic transformer and Center type piezoelectric ceramic transformer institute are inaccessible.
Figure 15, Figure 16 shows that 10.0～16.0V
RmsInput; Each the specification power output, the relationship between efficiency figure that are measured respectively during load RL=100K Ω find out that TPAPT type piezoelectric transformer has the characteristic of high power density, and its conversion efficiency does not reduce.
Following table compares the present invention and Rosen type piezoelectric ceramic transformer and Center type piezoelectric ceramic transformer three:
In a word: the maximum characteristics of the anti-phase dual output polarity interleaving type piezo-electric ceramic transformer of the present invention are, step-up ratio height, power density be big, can significantly reduce the system high pressure electric field, heating less, the conversion efficiency height, install very convenient.
The above only is preferred embodiment of the present invention, protection range of the present utility model not the office in this.Anyly all belong within the utility model protection range based on the equivalent transformation on the technical solutions of the utility model.
Claims (9)
1, a kind of have an anti-phase dual output polarity interleaving type piezo-electric ceramic transformer, it is made by rectangular piezoelectric body, it is characterized in that: it alongst is divided into rectangular piezoelectric body three districts, first district distinguishes for the input that is positioned at rectangular piezoelectric body middle part drives, scribble plane electrode and form by upper and lower surface along two drive ends of thickness direction polarization, its polarity is opposite or identical, all the other two districts are the output generating district that is positioned at the rectangular piezoelectric body both sides, two output termination scribbles electrode, along its length polarization in opposite directions.
2, as claimed in claim 1 have an anti-phase dual output polarity interleaving type piezo-electric ceramic transformer, it is characterized in that: input drives two drive ends in district and two adjustings of exporting generating section length ratios can work in all-wave pattern (λ pattern) and 1.5 times of wave modes (3 λ/2 patterns) by forming, and its vibration nodal point is respectively two and three.
3, as claimed in claim 1 have an anti-phase dual output polarity interleaving type piezo-electric ceramic transformer, and it is characterized in that: described rectangular piezoelectric body is formed by stacking by a plurality of individual layer piezoelectrics, has sandwich construction, and all is coated with protective layer at the outer surface of levels.
4, as claimed in claim 3 have an anti-phase dual output polarity interleaving type piezo-electric ceramic transformer, it is characterized in that: the input with sandwich construction drives each floor of distinguishing and polarizes along thickness direction, and thickness faces mutually two-layerly has opposite polarity, same one deck that two input drive ends face along its length mutually has opposite polarity or has identical polarity, the polarization in opposite directions along its length of each individual layer piezoelectrics of output generating district.
5, as claimed in claim 1 have an anti-phase dual output polarity interleaving type piezo-electric ceramic transformer, it is characterized in that: input drives two drive ends in district, has opposite residual polarization direction or has identical residual polarization direction.
6, as claimed in claim 5 have an anti-phase dual output polarity interleaving type piezo-electric ceramic transformer, it is characterized in that: the external electrode that described input drives every layer of two drive end in district joins or joins in external circuit with the phase place of (180 °) back that links each other in external circuit with the phase place of (0 °) back that links each other.
7, as claimed in claim 1 have an anti-phase dual output polarity interleaving type piezo-electric ceramic transformer, and it is characterized in that: the output voltage of two outputs of described piezoelectric ceramic transformer is anti-phase.
8, as claimed in claim 7 have an anti-phase dual output polarity interleaving type piezo-electric ceramic transformer, the output voltage of two outputs that it is characterized in that piezoelectric ceramic transformer is anti-phase, when driving (CCFL), Yi Bian any output of this piezoelectric ceramic transformer all can connect (CCFL) any end; Last second end of all the other another output terminations (CCFL).
9, as claimed in claim 8 have an anti-phase dual output polarity interleaving type piezo-electric ceramic transformer, it is characterized in that: when driving many (CCFL), (CCFL) can link to each other with piezoelectric ceramic transformer with the form of series connection each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410073220 CN1604354A (en) | 2004-11-03 | 2004-11-03 | Polarity interleaving type piezo-electric ceramic transformer having reversed phase twin-output |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410073220 CN1604354A (en) | 2004-11-03 | 2004-11-03 | Polarity interleaving type piezo-electric ceramic transformer having reversed phase twin-output |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306021A (en) * | 2015-11-16 | 2016-02-03 | 中国科学院苏州生物医学工程技术研究所 | Bipolar pulse signal generating device |
| CN107068847A (en) * | 2017-04-27 | 2017-08-18 | 苏州国科昂卓医疗科技有限公司 | A kind of piezoelectric device and preparation method thereof |
| CN112366271A (en) * | 2020-11-02 | 2021-02-12 | 安徽大学 | Integrated piezoelectric transformer capable of realizing capacitive impedance self-compensation |
| CN115148892A (en) * | 2022-05-25 | 2022-10-04 | 珠海多创科技有限公司 | Signal isolator and preparation method thereof |
-
2004
- 2004-11-03 CN CN 200410073220 patent/CN1604354A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306021A (en) * | 2015-11-16 | 2016-02-03 | 中国科学院苏州生物医学工程技术研究所 | Bipolar pulse signal generating device |
| CN105306021B (en) * | 2015-11-16 | 2018-06-12 | 中国科学院苏州生物医学工程技术研究所 | A kind of double polarity pulse signal generation device |
| CN107068847A (en) * | 2017-04-27 | 2017-08-18 | 苏州国科昂卓医疗科技有限公司 | A kind of piezoelectric device and preparation method thereof |
| CN112366271A (en) * | 2020-11-02 | 2021-02-12 | 安徽大学 | Integrated piezoelectric transformer capable of realizing capacitive impedance self-compensation |
| CN112366271B (en) * | 2020-11-02 | 2022-09-09 | 安徽大学 | Integrated piezoelectric transformer capable of realizing capacitive impedance self-compensation |
| CN115148892A (en) * | 2022-05-25 | 2022-10-04 | 珠海多创科技有限公司 | Signal isolator and preparation method thereof |
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