CN201438775U - Piezoelectric type resonance high-voltage lighting circuit - Google Patents
Piezoelectric type resonance high-voltage lighting circuit Download PDFInfo
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- CN201438775U CN201438775U CN2009201576836U CN200920157683U CN201438775U CN 201438775 U CN201438775 U CN 201438775U CN 2009201576836 U CN2009201576836 U CN 2009201576836U CN 200920157683 U CN200920157683 U CN 200920157683U CN 201438775 U CN201438775 U CN 201438775U
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- type resonance
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Abstract
The utility model provides a piezoelectric type resonance high-voltage lighting circuit, and particularly relates to a resonance tandem or parallel lighting circuit, with a piezoelectric transformer's capacitance taken as the piezoelectric capacitance. The lighting circuit comprises the piezoelectric transformer connected and an independent inductor which are connected in series with each other and connected on a lamp tube, achieves the effects of small leakage current, low temperature and high resistance to pressure, and assists in greatly improving the lighting efficiency. Moreover, the utility model is provided with a booster transformer which is arranged at the voltage output end for the purpose of further amplifying output, thereby providing the characteristic of high-brightness output. When applied in driving a plurality of lamp tubes, the utility model can employ a fixed frequency for the fixation of the internal impedance in the equivalent circuit of the piezoelectric capacitance in a manner that results in the currents in each lamp tube being consistent with each other, thereby achieving multi-lamp tube current balance.
Description
Technical field
The utility model relates to a kind of resonance point circuit for lamp, is meant a kind of piezoelectric type resonance high-voltage lamp circuit that utilizes independent inductance serial or parallel connection piezoelectric transformer especially.
Background technology
Cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp; CCFL) principle of luminosity is similar to general fluorescent lamp, its principle of luminosity is, after high-tension electricity is by the electrode tip input, minority electrons molecule high-speed impact electrode in the pipe, produce secondary this moment, and when beginning to discharge, electronics and mercury atom bump, mercury atom is stimulated and gives off the ultraviolet light of 253.7nm, and ultraviolet excitation is coated the fluorescent material on the tube wall and produced the visible light of relative colour temperature.General removing can be applicable to display, personal digital assistant, digital camera and mobile phone etc., and especially one of the indispensable backlight material of LCD.
Yet because the application of liquid crystal display is expanded gradually, its size also strengthens gradually, thus the employed cold cathode fluorescent lamp number of backlight also must with increase, to keep identical or higher brightness.Based on illuminance distribution and prolonging lamp tube service life requirement, the absolute value of lamp current and relative different are wanted rigorous control.A kind of many fluorescent tube modules of commonly using are to utilize coil form step-up transformer in parallel traditional on fluorescent tube, and its shortcoming is that efficient is not high, and the withstand voltage deficiency of coil, is easy to jump electrical breakdown because of high pressure, causes short circuit to be burnt, and has high danger.And the framework of another kind of many fluorescent tube modules, illustrate as Fig. 1, current difference between its fluorescent tube 100 is to be compensated by the capacitor 110 that is serially connected in fluorescent tube 100 high-pressure sides, therefore can cause very big leakage current, efficient is not high, and the resistance to pressure deficiency of capacitor 110, failure mode can be capacitor 110 blasts, causes the danger of catching fire easily.
On the other hand, because backlight uses U type fluorescent tube can reduce the use amount of fluorescent tube and converter, based on cost consideration, U type fluorescent tube is used in a large number, yet U type fluorescent tube has loss partly at the voltage and the electric current of bending part, enough voltage need be provided, just can reach the luminous efficiency the same with the elongated fluorescent tube.Therefore, seeking a kind of light a lamp efficient and high pressure spot circuit for lamp that reaches the tube current balance of improving, is the important topic that present industrial circle is very paid attention to.
Summary of the invention
In view of above problem, main purpose of the present utility model is to provide a kind of piezoelectric type resonance high-voltage lamp circuit, be to utilize capacitance characteristic that piezoelectric transformer itself had as piezoelectric capacitance, constitute the resonance point circuit for lamp of inductance serial or parallel connection piezoelectric transformer, can satisfy the demand of low electric leakage, the efficient of lighting a lamp height and current balance type, and further add step-up transformer in voltage output end, and output voltage is amplified, make that the high voltage startup fluorescent tube will be more easy.
Another purpose of the present utility model is to provide a kind of piezoelectric type resonance high-voltage lamp circuit, capacitor or coil form step-up transformer in the conventional point circuit for lamp have been replaced by piezoelectric transformer, not only volume is little, has superior electric usefulness, and can avoid causing fault and risk of overheating because of the resistance to pressure deficiency, its reliability height has market competition advantage.
Another purpose of the present utility model is to provide a kind of piezoelectric type resonance high-voltage lamp circuit, and utilizing the connected mode of series connection is to reduce line length, makes the final products size reach simplifying.
For reaching above-mentioned purpose, the piezoelectric type resonance high-voltage lamp circuit that the utility model discloses, be with the former high-power piezoelectric ceramic concussion sheet that is applied to the ultrasonic waves oscillator then be applied in the stabilizer of resonance point circuit for lamp and converter in as piezoelectric capacitance, this resonance point circuit for lamp has the characteristic that step-up ratio can change along with the internal impedance value of load, is fit to very much be applied in the driving of fluorescent tube.When fluorescent tube does not start as yet, can equivalence be open-circuit condition, this moment, the resonance point circuit for lamp can be supplied with the very high moment startup fluorescent tube recently that boosts; After fluorescent tube started, equivalent impedance descended, and therefore the circuit step-up ratio also can descend, and fluorescent tube is operated in the stable state normally.
In order to be applicable to the lighting demand of big electric current, high brightness; the utility model is to adopt step-up transformer that output voltage is promoted to required voltage; voltage after the rising offers each lamp tube ends; improved the utilance of electric energy; use the characteristic that high brightness output is provided; and can provide low start-up time, so can protect fluorescent tube.
Simultaneously, the utility model can be applied to the multi-light tube current balance, seeing through in the equivalent electric circuit that fixed frequency makes piezoelectric capacitance internal impedance value fixes, form a fixed current and pass through fluorescent tube, when the piezoelectric capacitance electrical characteristic on the piezoelectric capacitance on the serially connected lamp tubes and other fluorescent tube near the time, its internal impedance value is approaching, makes the electric current unanimity in each tubes, and reaches the tube current balance.
In addition, the utility model can be arranged in pairs or groups piezoelectric capacitance with independent inductance and be constituted the framework of resonance point circuit for lamp, is to be applicable to that the two high pressure under the full-bridge circuit light a lamp, and certainly, also is applicable to that the single high pressure under the half-bridge circuit is lit a lamp.
For making the purpose of this utility model, feature and function thereof there are further understanding, cooperate graphic being described in detail as follows now:
Description of drawings
Fig. 1 is many fluorescent tube modules of the general capacitor of use of prior art;
Fig. 2 A is the piezoelectric type resonance high-voltage lamp circuit that the utility model embodiment is provided, and wherein piezoelectric capacitance is series at resonant inductance;
Fig. 2 B is the piezoelectric type resonance high-voltage lamp circuit that the utility model embodiment is provided, and wherein piezoelectric capacitance is parallel to resonant inductance;
Fig. 3 is the modular construction of the piezoelectric capacitance that provided of the utility model embodiment;
Fig. 4 A, 4B are the piezoelectric type resonance high-voltage lamp circuits of the full-bridge output that provided of the utility model embodiment;
Fig. 5 A, 5B are that the piezoelectric type resonance high-voltage lamp circuit of the utility model embodiment uses the externally schematic diagram of electrode fluorescence lamp plate;
Fig. 6 A, 6B are that the piezoelectric type resonance high-voltage lamp circuit of the utility model embodiment uses the schematic diagram at light-emitting diode;
Fig. 7 A, 7B are that the piezoelectric type resonance high-voltage lamp circuit of the utility model embodiment uses the schematic diagram at Electricity-saving lamp bulb;
Fig. 8 A, 8B are the piezoelectric type resonance high-voltage lamp circuits of the full-bridge input that provided of the utility model embodiment;
Fig. 9 A, 9B are the piezoelectric type resonance high-voltage lamp circuits of the half-bridge input that provided of the utility model embodiment; And
Figure 10 is the equivalent electric circuit of the piezoelectric capacitance that provided of the utility model embodiment.
Among the figure:
10 piezoelectric capacitance
11 piezoelectricity base materials
12 conductive layers
13 conductive layers
20 piezoelectric capacitance
30 cold cathode fluorescent lamp
40 resonant inductances
41 resonant inductances
50 auxiliary capacitors
51 auxiliary capacitors
60 resonant inductances
61 resonant inductances
70 external electrode fluorescent lamp plates
80 light-emitting diodes
90 Electricity-saving lamp bulbs
100 fluorescent tubes
110 capacitors
The piezoelectric type resonance high-voltage lamp circuit of 200 pairs of high pressure inputs
The piezoelectric type resonance high-voltage lamp circuit of 300 single high pressure inputs
500 step-up transformers
Embodiment
Please refer to Fig. 2 A, it is the schematic diagram that illustrates the piezoelectric type resonance high-voltage lamp circuit that embodiment of the present utility model provides, mainly comprise the cold cathode fluorescent lamp 30 that are serially connected with between two auxiliary capacitors 50,51 of organizing more, each group cold cathode fluorescent lamp 30 is connected in parallel to each other, see through coupling of step-up transformer 500 again, and connect with piezoelectric capacitance 10 with resonant inductance 40.This piezoelectric type resonance high-voltage lamp circuit is to utilize capacitance characteristic that piezoelectric transformer itself had as piezoelectric capacitance 10; and connect with resonant inductance 40; constitute the resonance point circuit for lamp of an inductance series voltage transformer; can reach the function that up voltage is lit a lamp by the capacitance of adjusting resonant inductance 40 and piezoelectric transformer; simultaneously; more utilize step-up transformer 500 can export the characteristic of amplification; output voltage is promoted to required voltage; and the voltage after raising offers cold cathode fluorescent lamp 30 two ends; to reach the demand of high brightness output; and make the high voltage startup fluorescent tube more easy, and can be provided low start-up time, can protect fluorescent tube.
The disclosed piezoelectric capacitance 10 of present embodiment, as shown in Figure 3, it is the piezoelectricity base material 11 of making a circular plate shape with the piezoelectricity material, certainly, its shape can also be square or rectangle, again with elargol, copper cream or nickel cream make be similarly circular conductive layer 12,13 in the upper surface and the lower surface of the whole of piezoelectricity base material 11 or part, come guide current with the two poles of the earth that constitute piezoelectric capacitance 10.At this, see also Figure 10, be the equivalent electric circuit of piezoelectric capacitance 10; The equivalent capacity Cb and the Ca that illustrate equivalent resistance R, equivalent inductance L in the equivalent electric circuit and represent mechanical characteristic and electrical characteristics respectively.Different with general capacitor or coil form step-up transformer be in, the leakage current of the piezoelectric capacitance 10 of present embodiment is little, resistance to pressure is high, does not have overheated danger on fire, its reliability height, the power output that also can provide multiple to increase makes the efficient of lighting a lamp improve many; Secondly,, add and use resonant inductance, piezoelectric capacitance and the configuration of tube mode of being connected in series, can reduce whole line length, make the final products size reach simplifying because the volume of piezoelectric capacitance is little, package thickness thin.
In the present embodiment, piezoelectric capacitance 10 is to be series at resonant inductance 40, is not limited to this on the practice, shown in Fig. 2 B, piezoelectric capacitance 10 also can be parallel to resonant inductance 40, is connected in series and the mode of being connected in parallel is compared, to be connected in series be to keep lower temperature and utilize, and produces less consumption.In addition, auxiliary capacitor 50,51 also can be piezoelectric capacitance, the purposes that starts except performance, more can adjust the size of its capacitance, makes the size of output current produce fine setting, makes power output reach optimization.Voltage can raise moment when lighting a lamp, and when the load internal impedance of having lit a lamp diminished, step-up ratio can descend, so output can be adjusted, can reduce extra power consumption.
And the piezoelectric type resonance high-voltage lamp circuit of inductance series voltage transformer is effectively to keep the tube current balance; When transferring to exchanging, input pulse wave electric voltage source removes drive circuit, piezoelectric capacitance can rise to low pressure lights the required high pressure of fluorescent tube, because tube impedance property difference, the inconsistent meeting of lamp current causes the inhomogeneous and reduction lamp tube service life of backlight illumination, therefore, the utility model utilizes fixed frequency to drive the resonance point circuit for lamp, internal impedance value is fixed, pass through fluorescent tube and form a fixed current, when the electrical characteristic of the piezoelectric capacitance on the piezoelectric capacitance on the serially connected lamp tubes and other fluorescent tube near the time, its internal impedance value is approaching, makes the electric current unanimity in each tubes, in other words, promptly reach the function of multi-light tube current balance.
In the foregoing description, be piezoelectric capacitance 10 of each tubes 30 collocation with a resonant inductance 40 formation half-bridge resonance circuit, can reduce production cost, have the advantage of price competition.Certainly, if two resonant inductances 40,60 of collocation constitute the full-bridge resonant circuit, promptly can promote more high-power output, shown in Fig. 4 A, 4B.Wherein, Fig. 4 A is the embodiment of two resonant inductances, 40,60 piezoelectric capacitance 10 in parallel, and Fig. 4 B is the embodiment that two resonant inductances 40,60 are connected with two piezoelectric capacitance 10,20 respectively.
In addition, the utility model is applicable to single high-intensity discharge lamp (HID), negative metalized lamp, ceramic fluorescent lamp pipe (CPFL), cold cathode fluorescent lamp (CCFL), external electrode fluorescent lamp plate (EEFL), Electricity-saving lamp bulb or light-emitting diode (LED), also applicable to many cold cathode fluorescent lamp, external electrode fluorescent lamp plate, Electricity-saving lamp bulb or the light-emitting diode of parallel connection.See also Fig. 5 A, 5B, Fig. 6 A, 6B and Fig. 7 A, 7B, illustrate piezoelectric type resonance high-voltage lamp circuit of the present utility model respectively and use the externally schematic diagram of electrode fluorescence lamp plate 70 (perhaps being high-intensity discharge lamp (HID), negative metalized lamp, ceramic fluorescent lamp pipe (CPFL)), light-emitting diode 80 and Electricity-saving lamp bulb 90, two resonant inductances 40,60 can piezoelectric capacitance 10 in parallel, perhaps, also can connect with two piezoelectric capacitance 10,20 respectively.Certainly, its framework all can be half-bridge or full-bridge resonant circuit.
Moreover, the utility model is also applicable to large-sized backlight (for example more than 42 o'clock), and the large scale backlight often needs to install long fluorescent tube (such as the above fluorescent tube of length 1m), the capacity loss rate is big in its fluorescent tube, cause the difference of lighting tube brightness easily, independently resonant inductance and piezoelectric capacitance are come balancing capacitance at this moment every tubes individually with regard to needing.See also Fig. 8 A, 8B and Fig. 9 A, 9B, the piezoelectric type resonance high-voltage lamp circuit of importing with two high pressure (full-bridge) and single high pressure (half-bridge) 200 and 300 is an example respectively, each tubes 30 is series at respectively between 50,51 and two resonant inductances 41,61 of two auxiliary capacitors (seeing Fig. 8 A, 8B), perhaps, each tubes 30 is connected with a resonant inductance 41 with an auxiliary capacitor 10 respectively, and then gives parallel connection (seeing Fig. 9 A, 9B).Certainly, the utility model more is particularly suitable for U type fluorescent tube, and using provides high brightness output, makes the high voltage startup fluorescent tube more easy, and low start-up time, the useful life of prolonging lamp tube can be provided.
Though the utility model discloses as above with aforesaid embodiment, so it is not in order to limit the utility model.In not breaking away from spirit and scope of the present utility model, change of doing and retouching all belong to scope of patent protection of the present utility model.Please refer to appended claim about the protection range that the utility model defined.
Claims (12)
1. piezoelectric type resonance high-voltage lamp circuit includes:
One piezoelectric capacitance is to comprise a piezoelectricity base material and two conductive layers, and this piezoelectricity base material has upper surface and lower surface, and this two conductive layer is formed at the upper surface and the lower surface of this piezoelectricity base material respectively, and constitutes the two poles of the earth of this piezoelectric capacitance;
One resonant inductance, serial or parallel connection is in this piezoelectric capacitance; And
One step-up transformer is electrically coupled to this piezoelectric capacitance and a fluorescent tube, gives this fluorescent tube so that higher voltage to be provided.
2. according to 1 described piezoelectric type resonance high-voltage lamp circuit of claim the, wherein the number of this resonant inductance is two.
3. according to 2 described piezoelectric type resonance high-voltage lamp circuits of claim the, wherein this two resonant inductance is in parallel with this piezoelectric capacitance, or connects with this piezoelectric capacitance respectively.
4. according to 1 described piezoelectric type resonance high-voltage lamp circuit of claim the, wherein this fluorescent tube is the high-intensity discharge lamp for single, negative metalized lamp, ceramic fluorescent lamp pipe, cold cathode fluorescent lamp, external electrode fluorescent lamp plate, Electricity-saving lamp bulb or light-emitting diode.
5. according to 1 described piezoelectric type resonance high-voltage lamp circuit of claim the, wherein this fluorescent tube is many high-intensity discharge lamps for parallel connection, negative metalized lamp, ceramic fluorescent lamp pipe, cold cathode fluorescent lamp, external electrode fluorescent lamp plate, Electricity-saving lamp bulb or light-emitting diode.
6. according to 1 described piezoelectric type resonance high-voltage lamp circuit of claim the, more comprise an auxiliary capacitor, be series at this fluorescent tube.
7. according to 6 described piezoelectric type resonance high-voltage lamp circuits of claim the, wherein this auxiliary capacitor is to be another piezoelectric capacitance.
8. according to 6 described piezoelectric type resonance high-voltage lamp circuits of claim the, wherein the number of this auxiliary capacitor is two, and this fluorescent tube is to be series between this two auxiliary capacitor.
9. according to 8 described piezoelectric type resonance high-voltage lamp circuits of claim the, these two auxiliary capacitors resonant inductance of connecting respectively wherein.
10. according to 6 described piezoelectric type resonance high-voltage lamp circuits of claim the, wherein those fluorescent tubes are connect respectively an auxiliary capacitor and a resonant inductance.
11. according to 1 described piezoelectric type resonance high-voltage lamp circuit of claim the, wherein this piezoelectricity base material and this two conductive layer are to be circle, this two conductive layer is formed at the upper surface and the lower surface of the whole of this piezoelectricity base material or part respectively.
12. according to 1 described piezoelectric type resonance high-voltage lamp circuit of claim the, wherein this two conductive layer is formed by elargol, copper cream or nickel cream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201576836U CN201438775U (en) | 2009-05-31 | 2009-05-31 | Piezoelectric type resonance high-voltage lighting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201576836U CN201438775U (en) | 2009-05-31 | 2009-05-31 | Piezoelectric type resonance high-voltage lighting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201438775U true CN201438775U (en) | 2010-04-14 |
Family
ID=42400744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201576836U Expired - Lifetime CN201438775U (en) | 2009-05-31 | 2009-05-31 | Piezoelectric type resonance high-voltage lighting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201438775U (en) |
-
2009
- 2009-05-31 CN CN2009201576836U patent/CN201438775U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100414 |