CN201167428Y

CN201167428Y - Piezo-oscillator with high power output

Info

Publication number: CN201167428Y
Application number: CNU2008200031103U
Authority: CN
Inventors: 魏道金; 周明兴; 张锡臣
Original assignee: WEIYUAN TECHNOLOGY Co Ltd; Jinwei Trading Co Ltd
Current assignee: WEIYUAN TECHNOLOGY Co Ltd; Jinwei Trading Co Ltd
Priority date: 2008-01-23
Filing date: 2008-01-23
Publication date: 2008-12-17
Anticipated expiration: 2018-01-23

Abstract

The utility model relates to a piezoelectric oscillator with high-power output, the piezoelectric oscillator is applied in high-voltage lighting and characterized in that the piezoelectric oscillator contains a piezoelectric capacitor and a LC resonance circuit which are connected in parallel, the LC resonance circuit is utilized for generating resonance, the converse piezoelectric effect is generated through the power-on deformation of the piezoelectric capacitor, and positive charges which are generated by the converse piezoelectric effect and the direct piezoelectric effect generated after the deformation amplify the voltage, thereby improving the output power, reducing the production cost and lowering the power consumption.

Description

The piezoelectric oscillator of high power output

Technical field

The utility model relates to a kind of piezoelectric oscillator, be meant a kind of high power output piezoelectric oscillator of high pressure on lighting a lamp that be applied in 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 on the fluorescent material on the tube wall and produces the visible light of relative colour temperature.One of general removing can be applicable to display, personal digital assistant, digital camera and mobile phone etc., or the indispensable material backlight of LCD.Because cold-cathode fluorescence lamp do not adopt filament, so the problem of no filament blow so has very reliable useful life, use this kind fluorescent tube, advantage such as have high-luminous-efficiency, little, the high briliancy of caliber, heat is few, the life-span is long as lighting source.

For reaching the little requirement with good electrical usefulness of volume, the lamp circuit of cold cathode fluorescent lamp adopts piezoelectric transformer (piezoelectric transformer) to replace the coil form step-up transformer.Because piezoelectric transformer has that volume is little, high voltage gain, high efficiency, insulation is good and superior electrical characteristic such as no electromagnetic interference.Therefore, general common piezoelectric transformer is applied in the lamp circuit of high-luminous-efficiency illuminator, can reaches short and small frivolous and superior electric usefulness.

Yet, provide also big power output in order to make piezoelectric transformer, except amplifying, the simplest mode is the area increase with its silver electrode face, it is big that yet silver electrode face area becomes, and has the effect of reduction step-up ratio, and the effect that makes original expection improve power output is not cited.Amplify except increase cost, also disagree with the compact requirement of hope.

Summary of the invention

In view of above problem, main purpose of the present utility model is to provide a kind of piezoelectric oscillator of high power output, in order to overcome above-mentioned defective.

For achieving the above object, the technical solution adopted in the utility model is, a kind of piezoelectric oscillator of high power output is provided, and it is applied on high pressure lights a lamp, wherein,

It comprises a piezoelectric and a LC resonant circuit, and described piezoelectric is in parallel with described LC resonant circuit,

Described piezoelectric includes a piezoelectricity base material and two conductive layers, described piezoelectricity base material has upper surface and lower surface, described two conductive layers are respectively formed at the upper surface and the lower surface of described piezoelectricity base material, and constitute the two poles of the earth of described piezoelectric.

Advantage of the present utility model compared with the prior art is, at first, utilizes piezoelectric simple in structure to cooperate the LC resonant circuit, reaches high-power output, thereby can alleviate power consumption and production cost, has market competition advantage;

Secondly,, when load is transshipped, automatic protection mechanism be can bring into play, fault and risk of overheating avoided causing by the piezoelectric effect of piezoelectric under the LC resonant circuit;

Once more, with former be applied in the high-power piezoelectricity concussion sheet of ultrasonic waves oscillator then be applied in stabilizer that high pressure lights a lamp and converter in as piezoelectric, this piezoelectric can produce inverse piezoelectric effect when the energising distortion, the distortion back produces direct piezoelectric effect, so having positive charge produces, have the effect of amplifying voltage, and reach high-power output, having changed the conventional piezoelectric transformer only provides high voltage, little electric current and the limited shortcoming of power output.

Once more; the utility model is with piezoelectric and the collocation of LC resonant circuit; when the LC resonance; can performance the best export usefulness; and when load was transshipped, the temperature of piezoelectric can rise, capacitance becomes big, made the LC resonant circuit can't produce resonance; output usefulness diminishes, and has automatic protection functions.

At last, the utility model with piezoelectric can with LC resonant circuit collocation outside, also can match a capacitance auxiliary capacitor suitable and mate with piezoelectric, during at resonance, make the piezoelectric effect lifting at the LC resonant circuit, reach the power output optimization.

Description of drawings

Fig. 1 is the schematic diagram of the piezoelectric oscillator of the high power output that provided of the utility model embodiment;

Fig. 2 is the schematic diagram of the piezoelectric that provided of the utility model embodiment; With

Fig. 3 is the schematic diagram of the piezoelectric that provided of another embodiment of the utility model.

Description of reference numerals: 10-piezoelectric; 11-piezoelectricity base material; The 12-conductive layer; 121-electrode pin; The 13-conductive layer; 131-electrode pin; The 20-LC resonant circuit; The 30-auxiliary capacitor; 40-piezoelectric 50-lead-in wire.

Embodiment

Below in conjunction with accompanying drawing, to this novel above-mentionedly is described in more detail with other technical characterictic and advantage.

Piezoelectric oscillator according to high power disclosed in the utility model output at first please refer to Fig. 1, is the schematic diagram of piezoelectric oscillator of the high power output of the utility model embodiment.

This piezoelectric oscillator is to be applied in high pressure to light a lamp, and it mainly comprises capacitor 10, LC resonant circuit 20 and the auxiliary capacitor 30 of mutual parallel connection.The employed capacitor 10 of piezoelectric oscillator is a piezoelectric, in order to store electrical energy and have piezoelectric property, can adjust power factor (PF) exports power again, can produce inverse piezoelectric effect during the energising distortion, can produce direct piezoelectric effect after the distortion, and its just, the conversion of inverse piezoelectric effect will generate positive charge, make voltage amplification, and have an effect of amplifying voltage, to reach high-power output, and present embodiment in order to produce the LC resonant circuit 20 of resonance, when LC resonant circuit 20 resonance, can produce best output usefulness with piezoelectric 10 collocation.

Because the capacitance of piezoelectric 10 is influenced by temperature mainly can, therefore, deciding under the situation of electric current, its output voltage can change, present embodiment is that apolegamy auxiliary capacitor 30 mates with transformation capacitor 10, the capacitance of the capacitance of auxiliary capacitor 30 and transformation capacitor 10 is suitable, in order to auxiliary charging, makes piezoelectric effect reach the power output optimization.Voltage can raise moment when lighting a lamp, and the capacitance of having lit a lamp then can be made suitable coupling, so output can be followed piezoelectric effect adjustment, can reduce extra power consumption.

As shown in Figure 2, the piezoelectric 10 of present embodiment is to make a piezoelectricity base material 11 with the piezoelectricity material, be similarly upper surface and the lower surface of the

conductive layer

12,13 of circle with elargol, copper cream or the making of nickel cream again in the whole of piezoelectricity base material 11 or part, to constitute the two poles of the earth of piezoelectric 10, and weld respectively in

conductive layer

12,13 outsides and to be provided with electrode pin 121,131, to connect LC resonant circuit 20.Be to use a piezoelectric 10 in the present embodiment, can export power, only need collocation half-bridge resonance circuit up to 70 watts, can reduce production cost, the advantage that has price competition, certainly, if collocation full-bridge resonant circuit promptly can promote also high-power output.Moreover this piezoelectric 10 can change resonance output greatly because of capacitance becomes if the LC resonant circuit of collocation L impedance type is to have automatic protection functions when load is transshipped, and power output reduces, and temperature is descended; Because piezoelectric 10 has piezoelectric property, in case during the load overload, its temperature rises, capacitance becomes big, make the capacitance of LC resonant circuit inside change, and can't produce resonance, output usefulness diminishes, lamp also with dark get off, so can avoid causing fault and risk of overheating.

In addition, as shown in Figure 3, another embodiment of the present utility model is to use by a lead-in wire 50 and makes two piezoelectric 10,40 of connection up and down, piezoelectric can be serial or parallel connection on the practice, it has one group of piezoelectricity base material 11 and corresponding two conductive layers 12,13 (piezoelectric 10,40 structures are identical, so be representative with piezoelectric 10 only) respectively.Because capacitance improves, inductance value increases, and the power that the resonance back is produced also can and then become greatly, can export the power up to 100 watts, and temperature then can maintain about 30 ℃.This represents that also the piezoelectric conventional piezoelectric transformer of present embodiment is the power output that can provide multiple to increase, and does not have overheated problem.

More than explanation is novel just illustrative for this; and it is nonrestrictive; those of ordinary skills understand; under the situation of the spirit and scope that do not break away from following claims and limited; can make many modifications; change, or equivalence, but all will fall in the protection range of the present utility model.

Claims

1, the piezoelectric oscillator of a kind of high power output, it is applied on high pressure lights a lamp, and it is characterized in that:

2, the piezoelectric oscillator of high power output according to claim 1 is characterized in that: also comprise an auxiliary capacitor, be connected in parallel between described piezoelectric and the described LC resonant circuit.

3, the piezoelectric oscillator of high power output according to claim 2, it is characterized in that: the capacitance of described auxiliary capacitor is suitable with the capacitance of described piezoelectric.

4, the piezoelectric oscillator of high power output according to claim 1, it is characterized in that: described LC resonant circuit is made of half-bridge resonance circuit or full-bridge resonant circuit.

5, the piezoelectric oscillator of high power output according to claim 1 is characterized in that: the described two conductive layers outside is also welded respectively and is provided with an electrode pin, to connect described LC resonant circuit.

6, the piezoelectric oscillator of high power according to claim 5 output, it is characterized in that: described piezoelectricity base material and described two conductive layers are two groups, and by the in addition serial or parallel connection that goes between.

7, the piezoelectric oscillator of high power output according to claim 1, it is characterized in that: described piezoelectricity base material and described two conductive layers are for circular, and described two conductive layers are respectively formed at the upper surface and the lower surface of the whole of described piezoelectricity base material or part.

8, the piezoelectric oscillator of high power output according to claim 1, it is characterized in that: described two conductive layers are formed by elargol, copper cream or nickel cream.