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Method for suppressing unstable high frequency discharge of high-strengty discharge lamp and products thereof

A technology for high-intensity discharge lamps and high-frequency discharge, which is applied in the direction of electric light sources, electrical components, lighting devices, etc., and can solve the problem of unstable high-frequency discharge of metal halide lamps, difficulty in suppressing, and obstruction of electronic ballasts for high-intensity discharge lamps R & D and other issues, to achieve the effect of preventing stable ion oscillation, high-frequency discharge stability, and solving high-frequency discharge instability

Inactive Publication Date: 2004-03-24
广东雪莱特光电科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach has not been cleared for decades, especially the high-frequency discharge instability of metal halide lamps is more difficult to suppress, which seriously hinders the research and development of electronic ballasts for high-intensity discharge lamps

Method used

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  • Method for suppressing unstable high frequency discharge of high-strengty discharge lamp and products thereof
  • Method for suppressing unstable high frequency discharge of high-strengty discharge lamp and products thereof
  • Method for suppressing unstable high frequency discharge of high-strengty discharge lamp and products thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] See image 3 , the discharge current is modulated by modulating the amplitude of the DC power supply voltage with a low frequency signal.

[0019] In this example, the discharge frequency remains unchanged, and the amplitude of the DC power supply voltage applied to the high-frequency conversion part is modulated by low frequency, so that the amplitude of the discharge current changes periodically, and the high-frequency discharge current whose amplitude changes periodically at a low-frequency rate can change periodically in the discharge arc. The plasma temperature, density and ion oscillation frequency make it impossible to form stable ion oscillation, which ensures the stability of high-frequency discharge.

[0020] The low-frequency modulation signal in this example is a square wave signal, and the modulation effect of the square wave signal or quasi-square wave signal is better than other modulation signals.

Embodiment 2

[0022] See Figure 4 , the discharge current is modulated by modulating the high-frequency discharge frequency with a low-frequency signal.

[0023] In this example, the DC power supply voltage and the parameters of the impedance components of the discharge circuit remain unchanged, and the frequency of the discharge current changes periodically ( Figure 4 In f1≠f2), at this time, the reactance change caused by the frequency change causes the current amplitude to change periodically, so that the plasma parameters and ion oscillation frequency in the discharge arc can be alternately changed, and the occurrence of stable ion oscillation can be suppressed, ensuring high The stability of frequency discharge.

[0024] The low-frequency modulation signal in this example is a square wave signal, and the modulation effect of the square wave signal or quasi-square wave signal is better than other signals.

[0025] The high-voltage generating circuit of traditional high-intensity dis...

Embodiment 3

[0028] See Figure 5 , the discharge current is modulated by alternating the impedance of the discharge circuit with a low-frequency signal. In this example, the discharge frequency remains unchanged, and the discharge current amplitude changes periodically, so that the plasma density, temperature and ion oscillation frequency in the discharge arc can be alternately changed, so that stable ion oscillation cannot be formed, and the stability of the discharge is guaranteed.

[0029] The low-frequency modulation signal in this example is a square wave signal, and the modulation effect of the square wave signal or quasi-square wave signal is better than other signals.

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Abstract

A method products for suppressing high density discharging high frequency discharging unstable phenomenon is to provide high frequency discharging current as follow: turning AC or DC to suitable amplitude DC power source and carrying out high frequency alteration to the DC power source to provide it to a high density discharging lamp connected with high voltage generation circuit characterizing in low frequency modulation to its high frequency discharging circuit to control and regulate plasma parameter preventing generation of stable ion vibration to reach the aim of stabilizing high frequency discharge.

Description

Technical field [0001] The invention belongs to a method and a product for suppressing the unstable phenomenon of high-frequency discharge of a high-intensity discharge lamp. Background technique [0002] High-intensity discharge lamps (also known as HID lamps) often experience unstable discharge when they work at high frequencies. The traditional theory believes that this phenomenon is caused by the "acoustic resonance" effect, that is to say: when high-frequency discharge, the discharge The gas in the tube is heated by high frequency, so there is a temperature fluctuation that changes alternately with the change of the discharge polarity, and the frequency is twice as high as the discharge frequency, and this temperature fluctuation will inevitably lead to the expansion and contraction of the gas, thereby generating pressure waves - sound waves. When the wavelength of the sound wave resonates with the size of the discharge tube of the HID lamp (that is, d=nλ / 2, d is the s...

Claims

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Application Information

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IPC IPC(8): H05B41/28
Inventor 杨正名柴国生张明
Owner 广东雪莱特光电科技股份有限公司
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