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
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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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