CN201167428Y - Piezoelectric oscillator with high power output - Google Patents

Abstract

The utility model relates to a high power output's piezoelectric oscillator uses and lights a lamp at high pressure, and its characterized in that includes parallelly connected piezoelectric capacitor and LC resonant circuit, utilizes LC resonant circuit to produce the resonance to and produce the converse piezoelectric effect through piezoelectric capacitor circular telegram deformation, with the positive charge that the positive piezoelectric effect that produces after the deformation produced, with voltage amplification, and improve output, can reduce manufacturing cost and reduce power consumptively.

Description

High Power Output Piezoelectric Oscillators

technical field

The utility model relates to a piezoelectric oscillator, in particular to a high-power output piezoelectric oscillator applied to high-voltage lighting.

Background technique

The luminescence principle of Cold Cathode Fluorescent Lamp (CCFL) is similar to that of ordinary fluorescent lamps. Its luminescence principle is that when high voltage is input from the electrode end, a small number of electron molecules in the tube hit the electrode at high speed, and secondary electron emission is generated at this time. When the discharge starts, electrons collide with mercury atoms, and the mercury atoms are excited to emit 253.7nm ultraviolet light. The ultraviolet light excites the phosphor powder coated on the tube wall to produce visible light with relative color temperature. In addition to being widely used in monitors, personal digital assistants, digital cameras and mobile phones, etc., it is also one of the indispensable backlight materials for liquid crystal displays. Because cold cathode fluorescent lamps do not use filaments, there is no problem of filament burnout, so they have a very reliable service life. Using this kind of lamp as a lighting source has high luminous efficiency, small diameter, high luminance, less heat, and long life. Long and other advantages.

In order to meet the requirements of small size and good electrical performance, the lighting circuit of the cold cathode lamp adopts a piezoelectric transformer (piezoelectric transformer) instead of a coil type step-up transformer. Piezoelectric transformers have superior electrical characteristics such as small size, high voltage gain, high efficiency, good insulation and no electromagnetic interference. Therefore, piezoelectric transformers are generally used in the lighting circuit of high-luminous-efficiency lighting systems, which can achieve short, light, thin and superior electrical performance.

However, in order to make the piezoelectric transformer provide a larger output power, in addition to increasing the size, the simplest way is to increase the area of the silver electrode surface, but the larger the area of the silver electrode surface, the lower the step-up ratio. The effect of the original expected increase in output power is not obvious. In addition to increasing the cost, increasing the size also runs counter to the desire to be light, thin and short.

Contents of the invention

In view of the above problems, the main purpose of the present invention is to provide a piezoelectric oscillator with high power output to overcome the above defects.

In order to achieve the above purpose, the technical solution adopted by the utility model is to provide a high-power output piezoelectric oscillator, which is applied to high-voltage lighting, wherein,

It comprises a piezoelectric capacitor and an LC resonant circuit, the piezoelectric capacitor is connected in parallel with the LC resonant circuit,

The piezoelectric capacitor includes a piezoelectric substrate and two conductive layers, the piezoelectric substrate has an upper surface and a lower surface, and the two conductive layers are respectively formed on the upper surface of the piezoelectric substrate and the lower surface to form the two poles of the piezoelectric capacitor.

Compared with the prior art, the utility model has the advantages that, firstly, it uses a piezoelectric capacitor with a simple structure and cooperates with an LC resonant circuit to achieve high power output, thereby reducing power consumption and production costs, and has a very competitive advantage in the market;

Secondly, through the piezoelectric effect of the piezoelectric capacitor under the LC resonant circuit, an automatic protection mechanism will be exerted when the load is overloaded to avoid the danger of failure and overheating;

Thirdly, the high-power piezoelectric oscillator originally used in the ultrasonic oscillator is used in the ballast and inverter of high-voltage lighting as a piezoelectric capacitor. This piezoelectric capacitor can produce an inverse piezoelectric effect when it is energized and deformed. , After deformation, a positive piezoelectric effect will be generated, so that positive charges will be generated, which will amplify the voltage and achieve high power output, changing the shortcomings of traditional piezoelectric transformers that only provide high voltage, low current and limited power output.

Again, the utility model matches the piezoelectric capacitor with the LC resonant circuit. When the LC resonant circuit resonates, it can exert the best output performance, and when the load is overloaded, the temperature of the piezoelectric capacitor will rise and the capacitance value will increase, making the LC The resonant circuit cannot resonate, and the output performance becomes smaller, but it has an automatic protection function.

Finally, the utility model not only can match the piezoelectric capacitor with the LC resonant circuit, but also can choose an auxiliary capacitor whose capacitance value is equivalent to that of the piezoelectric capacitor for matching. When the LC resonant circuit is in resonance, the piezoelectric effect is improved, To achieve output power optimization.

Description of drawings

Fig. 1 is a schematic diagram of a piezoelectric oscillator with high power output provided by an embodiment of the present invention;

Fig. 2 is the schematic diagram of the piezoelectric capacitor provided by the embodiment of the utility model;

Fig. 3 is a schematic diagram of a piezoelectric capacitor provided by another embodiment of the present invention.

Description of reference signs: 10-piezoelectric capacitor; 11-piezoelectric substrate; 12-conductive layer; 121-electrode pin; 13-conductive layer; 131-electrode pin; 20-LC resonant circuit; 30-auxiliary capacitor ; 40-piezoelectric capacitor 50-leads.

Detailed ways

The above-mentioned and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

According to the piezoelectric oscillator with high power output disclosed in the present invention, firstly please refer to FIG. 1 , which is a schematic diagram of the piezoelectric oscillator with high power output according to an embodiment of the present invention.

The piezoelectric oscillator is applied in high-voltage lighting, and it mainly includes a capacitor 10 , an LC resonant circuit 20 and an auxiliary capacitor 30 connected in parallel. The capacitor 10 used in the piezoelectric oscillator is a piezoelectric capacitor, which is used to store electric energy and has piezoelectric characteristics. It can adjust the power factor and then output the power. When it is energized and deformed, it will produce an inverse piezoelectric effect, and after deformation, it will produce a positive pressure Electric effect, and the conversion of its positive and negative piezoelectric effects will generate positive charges, which will amplify the voltage and have the effect of amplifying the voltage to achieve high power output. In this embodiment, the piezoelectric capacitor 10 is used to generate resonance The LC resonant circuit 20, when the LC resonant circuit 20 resonates, can produce the best output performance.

Since the capacitance value of piezoelectric capacitor 10 is mainly affected by temperature, its output voltage will change under the condition of constant current. The capacitance value is equivalent to the capacitance value of the variable voltage capacitor 10, and is used for auxiliary charging, so as to optimize the output power of the piezoelectric effect. When the light is turned on, the voltage will rise instantly, and the capacitance value will be properly matched after the light is turned on, so the output will be adjusted according to the piezoelectric effect, which can reduce additional power consumption.

As shown in Figure 2, the piezoelectric capacitor 10 of this embodiment is to make a piezoelectric substrate 11 with piezoelectric material, and then make the same circular conductive layers 12, 13 with silver glue, copper paste or nickel paste. The whole or part of the upper surface and the lower surface of the electric substrate 11 constitute the two poles of the piezoelectric capacitor 10 , and electrode pins 121 , 131 are respectively welded on the outside of the conductive layers 12 , 13 to connect the LC resonant circuit 20 . In this embodiment, a piezoelectric capacitor 10 is used, which can output up to 70 watts of power. It only needs to be matched with a half-bridge resonant circuit, which can reduce production costs and has the advantage of price competition. Of course, if it is matched with a full-bridge resonant circuit Can drive also high power output. Furthermore, if the piezoelectric capacitor 10 is matched with an L-impedance LC resonant circuit, it has an automatic protection function. When the load is overloaded, the resonant output can be changed due to the increase in the capacitance value, and the output power is reduced, so that the temperature is lowered; Capacitor 10 has piezoelectric characteristics. Once the load is overloaded, its temperature rises and its capacitance value becomes larger, so that the capacitance value inside the LC resonant circuit changes, so that resonance cannot be generated, the output efficiency becomes smaller, and the lamp dims accordingly. The risk of failure and overheating can be avoided.

In addition, as shown in Figure 3, another embodiment of the present utility model is to use two piezoelectric capacitors 10, 40 connected up and down through a lead wire 50. In practice, the piezoelectric capacitors can be connected in series or in parallel, and each has a A set of piezoelectric substrates 11 and corresponding two conductive layers 12, 13 (the piezoelectric capacitors 10, 40 have the same structure, so only the piezoelectric capacitor 10 is represented). As the capacitance value increases, the inductance value increases, the power generated after resonance will also increase, and the output power can reach up to 100 watts, while the temperature can be maintained at about 30°C. This also means that the piezoelectric capacitor of this embodiment can provide multiple times higher output power than the conventional piezoelectric transformer, and there is no problem of overheating.

The above description is only illustrative, rather than restrictive, of the present invention. Those of ordinary skill in the art understand that many modifications and changes can be made without departing from the spirit and scope defined by the following appended claims. Or equivalent, but all will fall within the protection domain of the present utility model.

Claims (8)

1. A high-power output piezoelectric oscillator, which is applied to high-voltage lighting, is characterized in that: It comprises a piezoelectric capacitor and an LC resonant circuit, the piezoelectric capacitor is connected in parallel with the LC resonant circuit, The piezoelectric capacitor includes a piezoelectric substrate and two conductive layers, the piezoelectric substrate has an upper surface and a lower surface, and the two conductive layers are respectively formed on the upper surface of the piezoelectric substrate and the lower surface to form the two poles of the piezoelectric capacitor. 2. The piezoelectric oscillator with high power output according to claim 1, further comprising an auxiliary capacitor connected in parallel between the piezoelectric capacitor and the LC resonant circuit. 3. The piezoelectric oscillator with high power output according to claim 2, wherein the capacitance of the auxiliary capacitor is equivalent to the capacitance of the piezoelectric capacitor. 4. The high-power output piezoelectric oscillator according to claim 1, characterized in that: said LC resonant circuit is composed of a half-bridge resonant circuit or a full-bridge resonant circuit. 5. The high-power output piezoelectric oscillator according to claim 1, wherein an electrode pin is welded on the outside of the two conductive layers to connect to the LC resonant circuit. 6. The piezoelectric oscillator with high power output according to claim 5, characterized in that: the piezoelectric substrate and the two conductive layers are in two groups, and are connected in series or in parallel through a lead wire. 7. The piezoelectric oscillator with high power output according to claim 1, characterized in that: the piezoelectric substrate and the two conductive layers are circular, and the two conductive layers are respectively formed on the The entire or part of the upper and lower surfaces of the piezoelectric substrate. 8. The piezoelectric oscillator with high power output according to claim 1, characterized in that: said two conductive layers are formed by silver glue, copper paste or nickel paste.

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