RU2454045C1 - Starting device for high pressure gas discharge lamps - Google Patents

Abstract

FIELD: electric engineering.

SUBSTANCE: invention relates to start-control equipment and may be used for starting high pressure gas discharge lamps. The starting device for gas discharge lamps is consisted of a control init, feedback unit, slave key, piezo element and electric magnet containing spring-loaded armature and stator with coil. Besides, the piezo element is located coaxially to the armature of electric magnet at a distance from the full run of the element and connected with gas discharge lamps contacts with its electrodes. The electro magnet coil is coupled with mains through the slave key.

EFFECT: reduced device sensitivity to mains voltage drops and to external conditions of operation, simplified design.

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Description

FIELD OF THE INVENTION

The invention relates to ballasts and can be used to start high-pressure discharge lamps.

State of the art

Known devices comprising a starter, a diode bridge and a capacitor connected in series with each other, with a thyristor included in the output diagonal of the bridge, the control circuit of which consists of a voltage divider with a tuning resistor and protection against operation in the event of a malfunction or absence of a lamp in the lamp in the form of a posistor with heating element. (Pat. 92008123 RF, MPK6 Н05В 41/231. Pulse ignition device / Galay N.V. [UA], Kozhushko G.V. [UA]; applicant and patent holder Ukrainian Scientific Research and Design Institute of Light Sources [UA ]. - No. 92008123/07; application. 25.11.1992; publ. 10.03.1995.)

The disadvantage of such devices is the high material consumption and design complexity.

Known pulse ignition devices for high-pressure discharge lamps containing a power circuit, a microprocessor, a control circuit and a transformer. (Gareev V.M. Pulse ignition devices for high-pressure discharge lamps / V.M. Gareev, O.G. Fomin, P.V. Memikov // Bulletin of Novgorod State University. - 2001. - No. 19.)

The disadvantage of such devices is the high material consumption and design complexity.

The closest in technical essence and the achieved positive effect and accepted by the authors for the prototype is an ignition device on a piezotransformer for high-pressure discharge lamps, containing a voltage converter, piezotransformer, voltage, discharger, control unit, feedback unit, power supply, resistive voltage divider, the last of which is connected to the terminals of a high-pressure discharge lamp. (A. Goroshkevich. Ignition device on a piezotransformer for high-pressure discharge lamps / A. A. Goroshkevich, V. R. Medvid, N. G. Tarasenko // Lighting Engineering. - 1993. - No. 11. - P. 22-23 .)

The disadvantage of this ignition device is the design complexity due to the large number of discrete elements in various blocks, high criticality to voltage drops and temperature changes, because its change affects the resonance characteristics of the piezotransformer. (Sharapov V.M. Piezoceramic transformers and sensors / V.M. Sharapov, I.G. Minaev, Zh.V. Sotula and others; edited by V.M.Sharapov. - Cherkasy: Vertical. - 2010. - 278 p.)

Disclosure of invention

The technical result that can be achieved using the proposed ignition device for gas discharge lamps of high pressure is to reduce the criticality of the device to voltage drops of the power supply network and external operating conditions, simplifying the design.

The technical result is achieved using an ignition device for high-pressure discharge lamps, containing a control device, a feedback unit, a controlled key, the device is additionally equipped with a piezoelectric element and an electromagnet containing a spring-loaded armature and a stator with a coil, while the piezoelectric element is aligned with the armature of the electromagnet at a distance its full stroke and with its electrodes is connected to the contacts of the discharge lamp, and the electromagnet coil is connected to the power supply through the control my key.

Brief Description of the Drawings

In FIG. The block diagram of the igniter for high-pressure discharge lamps is given.

The implementation of the invention

The ignition device contains an electromagnet 1, a piezoelectric element 2, a protective gasket 3, a feedback unit 4, a control device 5 and a controlled key 6.

In this case, the electromagnet 1 contains a coil 7, an anchor 8, a spring 9. The piezoelectric element 2 is located coaxially with the armature 8 of the electromagnet 1 at a distance of its full stroke and is connected to the contacts (not indicated) of the discharge lamp 10 by its electrodes (not marked) 10. The electromagnet 7 coil 7 connected to the power supply through the output circuit (not indicated) of the controlled key 6. The electromagnet 1 and the piezoelectric element 2 are located in a dielectric casing (not indicated). The discharge lamp 10 is connected to the power supply U via a choke (not indicated). On the piezoelectric element 2 from the side of the impact end (not indicated) of the armature 8 is a protective gasket 3.

The input (not indicated) of the feedback unit 4, which, in particular, can be made in the form of a measuring current transformer, is connected in series with the discharge lamp 10. The output (not indicated) of the feedback unit 4 is connected to the input (not indicated) of the control device 5 the output of which is connected to the input circuit (not indicated) of the managed key 6. The managed key 6, in particular, can be performed on the triac.

The ignition device for high-pressure discharge lamps operates as follows.

Prior to supplying the supply voltage U, the discharge lamp 10 is in the off state, no current flows through it. When the supply voltage U is applied, the control device 5 starts to generate pulses that are fed to the input of the controlled key 6. When the first pulse arrives, the output circuit of the controlled key 6 opens, the electromagnet 1 is triggered, the anchor 8 makes a full stroke, compressing the spring 9. The anchor 8 strikes the piezoelectric element 2 through the protective gasket 3. In this case, the protective gasket 3 distributes the impact force evenly on the surface of the piezoelectric element 2, protecting it from mechanical damage. At the electrodes of the piezoelectric element 2 due to the direct piezoelectric effect, a high-voltage pulse arises at the contacts of the gas discharge lamp 10. It is ignited. Upon completion of the control pulse at the input of the controlled key 6, the latter breaks the power circuit of the coil 7 of the electromagnet 1. The armature 8 under the influence of a cocked spring 9 returns to its original state. When the gas discharge lamp 10 is ignited, the current in its supply circuit increases (for example, for the DNaT-400 lamp, the starting current is 5.2 A), which is detected by the feedback unit 4. The signal from the feedback unit 4 is fed to the input of the control device 5, which ceases to generate pulses. The output circuit of the controlled key 6 remains closed, and the coil 7 of the electromagnet 1 is de-energized.

If the discharge lamp 10 does not start after the first high-voltage pulse, the control unit 5 continues to generate pulses supplied to the input of the controlled key 6. The armature 8 of the electromagnet 1 continues to strike the piezoelectric element 2 through the protective gasket 3, the high-voltage pulses from which are supplied to the discharge lamp 10 until her ignition.

A working model of an ignition device for high-pressure discharge lamps was manufactured. We used a piezoelectric element 2 made of TsTS-19 material, diameter: 7 mm, length: 15 mm, capacitance: C = 20 · 10 ^-12 F, piezoelectric module: d = 210 · 10 ^-12 C / N. For normal ignition of a lamp like DNaT, an average of 3000 V should be applied to its contacts. To obtain such a voltage on the electrodes of piezoelectric element 2, a charge should appear in it due to the direct piezoelectric effect:

Q = U × C = 3000 × 20 · 10 ^-12 = 6 · 10 ^-8 C.

To obtain such a charge, it is necessary to inflict a pulsed blow on the piezoelectric element with the force:

The manufactured operating model of the device showed its operability and produced the required high-voltage pulse, sufficient to kindle a gas discharge lamp 10 from the first operation of electromagnet 1.

The invention in comparison with the prototype and other known technical solutions has the following advantages.

1. High reliability of the device, due to its simplicity.

2. Low criticality to voltage drops and changes in ambient temperature.

Claims (1)

An ignition device for high-pressure discharge lamps, comprising a control device, a feedback unit, a controllable key, characterized in that the device is additionally equipped with a piezoelectric element and an electromagnet containing a spring-loaded armature and a stator with a coil, while the piezoelectric element is aligned with the armature of the electromagnet at a distance of its full the course and with its electrodes is connected to the contacts of the discharge lamp, and the electromagnet coil is connected to the power supply via a controlled key.

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