CN201119090Y - Piezoelectric ceramic electronic ballast - Google Patents

Abstract

The utility model relates to a piezoelectric ceramic electronic ballast and belongs to the technical field of switching power supplies. The two input terminals of the first-stage piezoelectric ceramics in the ballast are connected to the AC power supply, the first output terminal of the two output terminals is connected to one pole of the gas discharge lamp through an inductance device, and at the same time is connected to the second-stage piezoelectric ceramics through a trigger device the first input terminal of . The second output terminal of the two output terminals of the first-stage piezoelectric ceramic is connected to the other pole of the gas discharge lamp, and simultaneously connected to the second input terminal of the second-stage piezoelectric ceramic. The first output terminal of the two output terminals of the second-stage piezoelectric ceramic is connected to one pole of the gas discharge lamp through a capacitor, and the second output terminal is connected to the other pole of the gas discharge lamp. The utility model realizes the function of the ballast by adopting the practical technical scheme, and the piezoelectric ceramic not only has the advantage of high temperature resistance, but also has the electrical isolation between the front-stage drive and the rear-stage load, which can eliminate the front and rear electromagnetic interference. Moreover, the entire ballast can be ultra-thin and ultra-light, and the cost is also very economical.

Description

Piezoelectric ceramic electronic ballast

technical field

The utility model relates to an electronic ballast, in particular to an improvement of the electronic ballast, which belongs to the technical field of switching power supplies.

Background technique

The ballast is an indispensable starting device for common gas discharge lamps. Electronic ballasts have changed the shortcomings of traditional magnetic ballasts, which are bulky, prone to noise, and not energy-saving, and have become a rapidly developing alternative product. Electronic ballasts not only have a wide variety, but also have been improved in an endless stream. For example, Chinese invention patent application number 200610045836.9 discloses an electronic ballast for high-intensity gas discharge lamps. It consists of anti-interference passive filter, bridge rectifier circuit, passive power factor correction circuit, half-bridge high-frequency conversion circuit and LC series resonant circuit/driver circuit. Although compared with traditional ballasts, electronic ballasts have many advantages, but their circuit configuration is relatively complicated, their high temperature resistance is poor, and their cost is high.

Piezoelectric ceramics have the characteristics of generating high voltage under mechanical excitation or AC excitation, so they are used in electronic lighters and cold cathode fluorescent lamp backlight power supplies. However, it has not been found to be applied to ballasts. Although the application number is 93212552.2 and the Chinese patent application titled "Remote Control Energy-saving Fluorescent Lamp" mentions piezoelectric ceramics, it is not applied to ballasts.

Utility model content

The purpose of this utility model is to propose a piezoelectric ceramic electronic ballast with simple circuit, small size and low cost in view of the above shortcomings or deficiencies in the prior art.

In order to achieve the above purpose, the piezoelectric ceramic electronic ballast of the present utility model includes piezoelectric ceramics, the piezoelectric ceramics has at least two stages, the two input terminals of the first stage piezoelectric ceramics are connected to the input power supply, and the first stage The first output terminal of the two output terminals of the piezoelectric ceramic is connected to one pole of the gas discharge lamp through an inductive device, and at the same time, after passing through the inductive device, it is connected to the first input terminal of the second-stage piezoelectric ceramic through a trigger device. The second output terminal of the two output terminals of the first-stage piezoelectric ceramic is connected to the other pole of the gas discharge lamp, and at the same time connected to the second input terminal of the second-stage piezoelectric ceramic, and the second output terminal of the two output terminals of the second-stage piezoelectric ceramic One output terminal is connected to one pole of the gas discharge lamp through a capacitor device, the second output terminal of the two output terminals of the second-stage piezoelectric ceramic is connected to the other pole of the gas discharge lamp, and the breakover voltage of the trigger device is between the specified Between the ignition voltage and the working voltage of the above-mentioned gas discharge lamps.

When working, after the AC power is input to the first-stage piezoelectric ceramics, it is boosted and output. Since the gas discharge lamp is not lit at this time, it is equivalent to an open circuit, so the voltage at both ends will be greater than the breakover voltage of the trigger device. The second-stage The piezoceramic generates high voltage at its output due to the voltage applied to the input end, and the lamp is lit up through the trigger capacitor. At this time, because the voltage at both ends of the lamp is less than the breakover voltage of the trigger device, the second piezoelectric ceramic exits work, the output voltage of the first piezoelectric ceramic keeps the lamp on.

It can be seen that the utility model uses piezoelectric ceramics to realize the function of the ballast with a feasible technical solution. The piezoelectric ceramics not only has the advantage of high temperature resistance, but also can make the entire ballast ultra-thin and ultra-light. The cost is also very economical.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is a schematic circuit diagram of Embodiment 1 of the present utility model.

Fig. 2 is a schematic circuit diagram of the second embodiment of the utility model.

Detailed ways

Embodiment one

The piezoelectric ceramic electronic ballast of this embodiment is shown in Figure 1. The two input terminals A-B of the first-stage piezoelectric ceramic ZH are respectively connected to the DC/AC switching power supply module (TWM100-XX-XX series) as the AC power supply. Two output terminals OUT, this module can convert the 12V (or 24V, 36V, 48V) power supply of the low-voltage DC rechargeable battery EIN input +IN and -IN into an AC sine wave output. Among the two output terminals of the first-stage piezoelectric ceramic ZH, the first output terminal H1 is connected to one pole M of the gas discharge lamp HID through the inductance L, and at the same time, after passing through the inductance L, it is connected to the second-stage piezoelectric ceramic ZJ through the trigger tube TVS The first input terminal C. The second output terminal H2 of the first-stage piezoelectric ceramic ZH is connected to the other pole N of the gas discharge lamp, and simultaneously connected to the second input terminal D of the second-stage piezoelectric ceramic ZJ. Among the two output terminals of the second-stage piezoelectric ceramic ZJ, the first output terminal H1' is connected to the M pole of the gas discharge lamp HID through the capacitor CJ, and the second output terminal D is connected to the other pole N of the gas discharge lamp.

In this way, after the 12V (or 24V, 36V, 48V) low-voltage DC rechargeable battery EIN passes through the DC/AC switching power supply module, it outputs tens of volts and tens of thousands of Hz AC sine waves that meet the requirements of piezoelectric ceramics, and provides them to the first stage voltage. The input terminal A-B of the electroceramic ZH is boosted by the piezoelectric ceramic, and the output terminal H1-H2 outputs an alternating current of up to several thousand volts, and the current is limited by the inductance L to light the lamp. Before the gas discharge lamp HID is not lit, the HID is equivalent to an open circuit, so the voltage across the HID is greater than the breakover voltage of the trigger tube TVS. The second-stage piezoelectric ceramic ZJ input terminal C-D used for ignition obtains the voltage output by the first stage, and drives the ZJ output terminal H1-H2 to generate a high-voltage ignition, and the HID is activated through the trigger capacitor CJ. After that, the HID lamp works, the voltage at both ends is less than the breakover voltage of TVS, the second-stage piezoelectric ceramic ZJ stops working, and the high voltage output by the first-stage piezoelectric ceramic ZH of the HID is limited by the inductor L to keep the lamp emitting light.

Experiments have proved that the electrical isolation between the front-stage drive and the rear-stage load in this embodiment can eliminate front and rear electromagnetic interference. High-temperature piezoelectric ceramic HID lamp electronic ballasts are more competitive than existing similar products in terms of volume, weight, reliability, and price.

Embodiment two

The piezoelectric ceramic electronic ballast in this embodiment is basically the same as the first embodiment, the difference is that the power supply directly adopts the mains, and after passing through the AC/AC sine wave power module (TWA100-XX-XX series), the output meets the piezoelectric The high-frequency AC sine wave of the ceramic is provided to the input terminal A-B of the first-stage piezoelectric ceramic ZH. Its use effects and advantages are basically the same.

In addition to the above embodiments, the utility model can also have other implementations. For example, piezoelectric ceramics can be either a single wafer or multiple wafers, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the utility model.

Claims (6)

1. Piezoelectric ceramic electronic ballasts, including piezoelectric ceramics, are characterized in that: the piezoelectric ceramics have at least two stages, and the two input terminals of the first-stage piezoelectric ceramics are connected to the input power supply; the first-stage piezoelectric ceramics The first output terminal of the two output terminals of the ceramic is connected to one pole of the gas discharge lamp through an inductive device, and at the same time, after passing through the inductive device, it is connected to the first input terminal of the second-stage piezoelectric ceramic through a trigger device; the first-stage voltage The second output terminal of the two output terminals of the electric ceramic is connected to the other pole of the gas discharge lamp, and at the same time connected to the second input terminal of the second-stage piezoelectric ceramic; the first output terminal of the two output terminals of the second-stage piezoelectric ceramic The terminal is connected to one pole of the gas discharge lamp through a capacitor device, and the second output terminal of the two output terminals of the second-stage piezoelectric ceramic is connected to the other pole of the gas discharge lamp; the breakover voltage of the trigger device is between the gas discharge lamp Between the ignition voltage and the working voltage of the discharge lamp. 2. The piezoelectric ceramic electronic ballast according to claim 1, wherein the input power source is composed of a low-voltage DC rechargeable battery connected to a DC/AC switching power supply module. 3. The piezoelectric ceramic electronic ballast according to claim 1, characterized in that: said input power source is composed of AC/AC sine wave power module connected to mains. 4. The piezoelectric ceramic electronic ballast according to claim 2 or 3, wherein the trigger device is a trigger tube. 5. The piezoelectric ceramic electronic ballast according to claim 4, wherein the piezoelectric ceramic is a single crystal piezoelectric ceramic. 6. The piezoelectric ceramic electronic ballast according to claim 4, wherein the piezoelectric ceramic is a multi-chip piezoelectric ceramic.

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