CN2539289Y - Piezoelectric ceramic transistor - Google Patents
Piezoelectric ceramic transistor Download PDFInfo
- Publication number
- CN2539289Y CN2539289Y CN 02234549 CN02234549U CN2539289Y CN 2539289 Y CN2539289 Y CN 2539289Y CN 02234549 CN02234549 CN 02234549 CN 02234549 U CN02234549 U CN 02234549U CN 2539289 Y CN2539289 Y CN 2539289Y
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- capacitor
- piezoelectric ceramic
- piezoelectric
- ceramic transformer
- transistor
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- 239000000919 ceramic Substances 0.000 title claims abstract description 73
- 239000003990 capacitor Substances 0.000 claims abstract description 48
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 230000010355 oscillation Effects 0.000 claims abstract description 3
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract 1
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 239000002356 single layer Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 16
- 238000003475 lamination Methods 0.000 description 11
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 MOS metal-oxide Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The utility model relates to a piezoelectric ceramic transistor which can be used for piezoelectric conversion device, the piezoelectric transistor is composed of a conversion transformer and a capacitor made of monolayer or laminated piezoelectric ceramics, the capacitor is connected with the input terminal of the piezoelectric transformer in the form of parallel connection to form a bypass capacitor for enhancing electricity quantity, thereby preventing the non-return loss so as to compensate and enhance the oscillation effect of piezoelectric ceramic transformer; or a capacity is connected in series between power source output end and load of the piezoelectric ceramic transformer, or a capacity is connected in parallel at power source input end of the piezoelectric ceramic transformer, simultaneously a capacitor is connected in series between power source output end and load, so that more energies can be obtained again so as to improve load current.
Description
Technical field
The utility model relates to a kind of piezoelectric ceramics transistor, relates in particular to a kind of being applicable to and can improve the assembly of electric weight (energy) on the piezoelectric type conversion equipment.
Background technology
The at present various fixing or wheeled apparatus that are applied to the LCD LCDs, as desktop PC display screen, notebook computer, PDA(Personal Digital Assistant), Webpad etc.,, do not take up space because of volume is little, the user that is more convenient for portably uses, and therefore liked by the user.
Especially be used in when outdoor or the additional LCD liquid crystal indicator that touch controlled thin film is arranged, needing more, high brightness compensates visual demand.And general CCFL cold cathode fluorescent lamp pipe is to utilize high pressure to light a lamp, and when tube current more height, its brightness is brighter.As Fig. 1, shown in 2, for generally driving the drive unit that CCFL cold cathode fluorescent lamp pipe is lighted, this drive unit includes: a power subsystem 1, one pulse-width modulation (PWM) control unit 2, one driver element 3, one piezoelectric ceramic transformer 4 ' constitute, when this drive unit starts the adding input voltage, this driver element 3 drives piezoelectric ceramic transformer 4 ' action immediately through the positive inverse piezoelectric effect of piezoelectric ceramic, cause piezoelectric ceramic transformer 4 ' can drive cold cathode fluorescent lamp pipe 7 to light action, pulse-width modulation (PWM) this moment control unit 2 detects the average output current size of cold cathode fluorescent lamp pipes 7 by electric current back coupling 5, exporting a resonance frequency, through driver element 3 and piezoelectric ceramic transformer 4 ' can control the average current of cold cathode fluorescent lamp pipe 7.Therefore the light source that produced of cold cathode fluorescent lamp pipe 7 promptly is incident upon on the translucent backboard, causes backboard to produce brightness, fluid,matching crystal display screen (LCD) display frame.Because the brightness that described drive unit driving cold cathode fluorescent lamp pipe 7 is lighted is limited or for making brightness even, so must use many cold cathode fluorescent lamp pipes 7, just can make the backboard brightness of LCDs (LCD) even.So, will cause cost to increase, and also be difficult for making.
Summary of the invention
Main purpose of the present utility model, be to solve above-mentioned traditional shortcoming, avoid the existence of defective, the utility model is made of the piezoelectric transformer and a capacitor of an individual layer (plate) or lamination, be connected in the input of piezoelectric transformer with described capacitor with parallel form, form a bypass capacitor, in order to improve electric weight, can prevent to feedback the loss that is produced, with the oscillation effect of compensation and raising piezoelectric ceramic transformer; The electric capacity of perhaps between the power output end of piezoelectric transformer and load, connecting, perhaps at the power input of a piezoelectric transformer capacitor in parallel simultaneously at the electric capacity of connect between power output end and the load, the bigger energy of can reentrying (with the raising load current)
Another purpose of the present utility model is that piezoelectric ceramics transistor can utilize present existing part to be formed by connecting, or utilizes semiconductor packaging, is packaged into single component.
Another purpose of the present utility model is that piezoelectric ceramics transistor can make the drive unit that drives the cold cathode fluorescent lamp pipe make and be more prone to, and can reduces cost of manufacture.
Another purpose of the present utility model is that the cold cathode fluorescent lamp pipe number that piezoelectric ceramics transistor can be used on the LCDs reduces.
Another purpose of the present utility model is that piezoelectric ceramics transistor can be for the cold cathode fluorescent lamp pipe that drives big wattage (length is longer).
A purpose more of the present utility model is to use lower driving voltage to drive.
Relevant technology contents of the present utility model and structure just are described with reference to the accompanying drawings as follows now:
Description of drawings
Fig. 1 is available liquid crystal display screen (LCD) background light source drive circuit schematic diagram.
Fig. 2 is the circuit-line schematic diagram of Fig. 1.
Fig. 3 is an embodiment circuit box schematic diagram of the present utility model.
Fig. 4 is the circuit-line schematic diagram of Fig. 3.
Fig. 5 is the schematic diagram of another embodiment of the present utility model.
Fig. 6 is the schematic diagram of another embodiment of the present utility model.
Annex one: individual layer does not add the photo schematic diagram of capacitor.
Annex two: individual layer has the photo schematic diagram of shunt capacitor.
Annex three: lamination does not add the photo schematic diagram of capacitor.
Annex four: lamination has the photo schematic diagram of shunt capacitor.
Annex five: the photo schematic diagram that does not add capacitor.
Annex six: the photo schematic diagram of series capacitor between piezoelectric ceramic transformer output and the load (cold cathode fluorescent lamp pipe).
Annex seven: the photo schematic diagram of series capacitor between the input of a piezoelectric ceramic transformer capacitor in parallel and output and the load (cold cathode fluorescent lamp pipe).
Embodiment
See also shown in Fig. 3,4, be embodiment circuit box schematic diagram of the present utility model.As shown in the figure: the drive unit of this LCDs (LCD) includes: a power subsystem 1, one pulse-width modulation (PWM) control unit 2, one driver element 3, one piezoelectric ceramics transistor 4, in order to drive cold cathode fluorescent lamp pipe (CCFL) 7, the light source that this cold cathode fluorescent lamp pipe 7 is produced can provide the back lighting of LCDs (LCD).
Above-mentioned power subsystem 1 provides in this device and the required power supply in each unit;
This pulse-width modulation (PWM) control unit 4 is connected with the input of a driver element 3, and receives the electric current back coupling 5 of cold cathode fluorescent lamp pipe 7 and the voltage back coupling 6 of piezoelectric ceramics transistor 4.And feedback 5 according to work period (Duty Cycle) of the average current size decision output clock of detected cold cathode fluorescent lamp pipe 7 outputs and then at the average current of the shared proportional control cold cathode fluorescent lamp pipe 7 of clock time by electric current;
This driver element 3 is made of a MOS metal-oxide semiconductor assembly, and input is connected with pulse-width modulation (PWM) control unit 2, and accepts the resonance frequency output of pulse-width modulation (PWM) control unit 2, and then drives piezoelectric ceramics transistor 4 actions;
This piezoelectric ceramics transistor 4 is made of a piezoelectric ceramic transformer 41 and a capacitor 42 in parallel with described piezoelectric ceramic transformer 41 inputs, in order to drive cold cathode fluorescent lamp pipe 7.The input of described piezoelectric ceramic transformer 41 capacitor 42 in parallel, make this capacitor 42 form a bypass capacitance characteristic, can obtain bigger electric weight, the effect of its capacitor 42 can prevent to feedback the loss that is produced, and helps the vibration compensation effect of piezoelectric ceramic transformer 41.
When this drive unit starts, this driver element 3 drives piezoelectric ceramics transistor 4 actions immediately, cause piezoelectric ceramics transistor 4 can drive cold cathode fluorescent lamp pipe 7 and light action, pulse-width modulation (PWM) this moment control unit 2 detects the average output current size of cold cathode fluorescent lamp pipes 7 by electric current back coupling 5, exporting a resonance frequency, can control the average current of cold cathode fluorescent lamp pipe 7 through driver element 3 and piezoelectric ceramics transistor 4.
For progressive explanation the utility model, specially add capacitor and lamination piezoelectric ceramic transformer in conjunction with the veneer piezoelectric ceramic transformer to add the description of test of electric capacity as follows:
One, individual layer piezoelectric ceramic transformer (shown in annex one, two)
A, test condition:
1、V(DCV)：14V±5％
2, load: fluorescent tube length 220mm
3, operating frequency: 66KHZ ± 2KHZ
4, light modulation condition: DCV 0V
5, individual layer piezoelectric ceramic transformer: 48mmL * 8mmW * 1.8mmt
6, the static capacity of low-voltage end: 1.25nf
7, input lamination number: 1 layer
8, probe temperature: 27 ± 10% ℃
B, test report:
| Tube voltage (RMS) acV | Tube current (AVG) mAacI | |
| Do not add capacitor | 30V | 0mA |
| Add capacitor | 567V | 6.729mA |
C, testing efficiency:
1, do not add electric capacity
Tube voltage (RMS) acV * tube current (AVG) mAacI=P_out (w)
30V×0mA＝0W
Input voltage (DCV) * input current (DCI)=P_IN
14V×0.036A＝0.5W
2, be parallel with capacitor:
Tube voltage (RMS) acV * tube current (AVG) mAacI=P_out (w)
576V×0.6729mA＝3.81W
Input voltage (DCV) * input current (DCI)=P_IN
14V×1.268A＝17.72W
Experimental results show that by above-mentioned adding capacitor (0.127uf) can start the individual layer piezoelectric ceramic transformer.Need use a step-up transformer to improve existing individual layer piezoelectric ceramic transformer prime, voltage be made to drive again after the boost action earlier the problem of individual layer piezoelectric ceramic transformer, make in the making to be more prone to, and significantly reduce cost.
Two, lamination piezoelectric ceramic transformer (as annex three, four)
A, test condition:
1、V(DCV)：12V±5％
2, load: fluorescent tube length 220mm
3, operating frequency: 73.39KHZ ± 2KHZ
4, light modulation condition: DCV 0V
5, lamination piezoelectric ceramic transformer ± 10%:48mmL * 8mmW * 1.8mmt
6, the static capacity of low-voltage end: 82.9nf
7, input lamination number: 18 layers
8, probe temperature: 27 ± 10% ℃
B, test report:
| Tube voltage (RMS) acV | Tube current (AVG) mAacI | |
| Do not add capacitor | 500V | 6.86mA |
| Add capacitor | 475V | 13.186mA |
C, testing efficiency:
1, do not add electric capacity
Tube voltage (RMS) acV * tube current (AVG) mAacI=P_out (w)
500V×6.86mA＝3.43W
Input voltage (DCV) * input current (DCI)=P_IN
12V×0.378A＝4.53W
2, be parallel with capacitor:
Tube voltage (RMS) acV * tube current (AVG) mAacI=P_out (w)
475V×13.186mA＝6.25W
Input voltage (DCV) * input current (DCI)=P_IN
12V×0.882A＝10.58W
Experimental results show that by above-mentioned adding capacitor (0.1uf) can start the lamination piezoelectric ceramic transformer.
Seeing also shown in Figure 5ly, is the schematic diagram of another embodiment of the present utility model.As shown in the figure: capacitor 42 of the present utility model is except the input that can and be connected in piezoelectric ceramic transformer 41, can also be with capacitor 42 ' be connected in series between the output and load (cold cathode fluorescent lamp pipe) 7 of piezoelectric ceramic transformer 41, make the output voltage multiplication, in order to improve electric weight (energy).
Seeing also shown in Figure 6ly, is the schematic diagram of another embodiment of the present utility model.As shown in the figure: capacitor 42 of the present utility model can and be connected in the input of piezoelectric ceramic transformer 41, and be connected in series between the output and load (cold cathode fluorescent lamp pipe) 7 of piezoelectric ceramic transformer 41, output voltage is doubled again, more can improve electric weight (energy).
Three, piezoelectric ceramic transformer does not connect, and connects between output and load, or the input of piezoelectric ceramic transformer and output can be simultaneously also, the capacitor that is connected in series (seeing also annex five, six, seven).
A, test condition:
1、V(DCV)：12.1V±5％
2, load: fluorescent tube length 220mm * 1
3, operating frequency: 74KHZ ± 2KHZ
4, light modulation condition: DCV 0V
5, individual layer piezoelectric ceramic transformer: 42mmL * 7.4mmW * 3.7mmt
6, the static capacity of low-voltage end: 185nf
7, input lamination number: 18 layers
8, probe temperature: 27 ± 10% ℃
9, electric capacity: 100pF, 68nf
B, test report:
| Tube current (AVG) mAacI | |
| Do not connect electric capacity | 7.21mA |
| Output series connection 100pF capacitor | 8.25mA |
| Output series connection 100pF capacitor and input 68nf capacitor in parallel | 10.83mA |
Further, at the input of piezoelectric ceramic transformer 41 capacitor 42 in parallel, under same input voltage, except can obtaining bigger energy, the tube current of cold cathode fluorescent lamp pipe 7 is increased, cause 7 brightness of cold cathode fluorescent lamp pipe to increase, or drive the long fluorescent tube of length.Therefore, the number that is installed in the fluorescent tube 7 of LCDs (LCD) can reduce, or under identical input and loading condition, the input voltage of this drive unit can be reduced, used electronic component also can be reduced, or the lamination number of plies of piezoelectric ceramic transformer volume and use is reduced, and then reduce cost of manufacture, make in the making to be more prone to.
Further again, be to pass through semiconductor package shape technology, piezoelectric ceramic transformer 41 and capacitor 42 are made single piezoelectric ceramics transistor 4 assemblies, on making, can save more man-hour and operation, the drive unit of making driving cold cathode fluorescent lamp pipe 7 is more prone to.
Claims (7)
1. piezoelectric ceramics transistor, be used for the piezoelectric type conversion equipment, it is characterized in that: described piezoelectric ceramics transistor (4) is made of a piezoelectric ceramic transformer (41) and a capacitor (42), be connected in the input of piezoelectric ceramic transformer (41) with described capacitor (42), form a bypass capacitor, in order to improve electric weight, can prevent to feedback the loss that is produced, with the oscillation effect of compensation piezoelectric ceramic transformer.
2. piezoelectric ceramics transistor according to claim 1 is characterized in that, described capacitor (42) is the input that is connected in described piezoelectric ceramic transformer (41) with parallel way.
3. piezoelectric ceramics transistor according to claim 1 is characterized in that, described piezoelectric ceramic transformer (41) and capacitor (42) two assemblies can utilize existing part to be connected to form one and have the piezoelectric ceramics transistor (4) that promotes electric weight.
4. piezoelectric ceramics transistor according to claim 1, it is characterized in that, described piezoelectric ceramic transformer (41) can pass through semiconductor packaging with capacitor (42), and piezoelectric ceramic transformer (41) and capacitor (42) are made single piezoelectric ceramics transistor (4) assembly.
5. piezoelectric ceramics transistor according to claim 1 is characterized in that, described piezoelectric ceramics transistor (4) can supply to drive the bigger cold cathode fluorescent lamp pipe (7) of wattage, or the long cold cathode fluorescent lamp pipe (7) of length.
6. piezoelectric ceramics transistor according to claim 1 is characterized in that, the capacitor (42 ') of connecting between described piezoelectric ceramic transformer (41) and the load (7).
7. piezoelectric ceramics transistor according to claim 1 is characterized in that, the capacitor (42 ') of connecting between the input of described piezoelectric ceramic transformer (a 41) capacitor (42) in parallel and piezoelectric ceramic transformer (41) and the load (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02234549 CN2539289Y (en) | 2002-05-08 | 2002-05-08 | Piezoelectric ceramic transistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02234549 CN2539289Y (en) | 2002-05-08 | 2002-05-08 | Piezoelectric ceramic transistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2539289Y true CN2539289Y (en) | 2003-03-05 |
Family
ID=33709300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02234549 Expired - Lifetime CN2539289Y (en) | 2002-05-08 | 2002-05-08 | Piezoelectric ceramic transistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2539289Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760411A (en) * | 2011-04-26 | 2012-10-31 | 佛山市南海平板显示技术中心 | Piezoelectric transformer drive circuit |
| CN102760412A (en) * | 2011-04-26 | 2012-10-31 | 佛山市南海平板显示技术中心 | Piezoelectric transformer drive circuit |
-
2002
- 2002-05-08 CN CN 02234549 patent/CN2539289Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760411A (en) * | 2011-04-26 | 2012-10-31 | 佛山市南海平板显示技术中心 | Piezoelectric transformer drive circuit |
| CN102760412A (en) * | 2011-04-26 | 2012-10-31 | 佛山市南海平板显示技术中心 | Piezoelectric transformer drive circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20020508 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |