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Electronic ballast for fluorescent lamp with electronic protector

A technology for electronic ballasts and protection devices, applied in the field of electric light sources, can solve problems such as restricting applications, and achieve the effects of wide applicability, flexible design, and strict isolation

Inactive Publication Date: 2004-03-17
上海虎能电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This protection circuit has certain limitations in performance and limits its application

Method used

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  • Electronic ballast for fluorescent lamp with electronic protector
  • Electronic ballast for fluorescent lamp with electronic protector
  • Electronic ballast for fluorescent lamp with electronic protector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] See attached figure 2 , square wave signal source V, series resonant inductor and capacitor L and C 1 , R 1 , R 2 、D 1 、D 2 expression with figure 1 same. When R 1 and R 2 The resistance values ​​are not equal. The lamp voltage passes through the resistor R 3 , R 4 voltage divider, diode D 4 , resistance R 6 and capacitance C 2 Constitute a half-wave rectifier filter circuit, in the capacitor C 2 The voltage generated on is proportional to the non-inverting peak value of the lamp voltage. Diode D 3 , resistance R 5 and C 4 Constitute another half-wave filter circuit, in the capacitor C 4 The voltage generated on is proportional to the negative phase peak of the lamp voltage. Capacitance C 2 A positive voltage on the R 7 For capacitance C 3 For forward charging, the capacitor C 4 The negative voltage on the resistor R 8 For capacitance C 3 For reverse charging, the capacitor C 3 The voltage signal on it is sent to the control circuit IC. The c...

Embodiment 2

[0012] attached image 3 It is an embodiment where the lamp load is isolated from the electronic rectifier. Resistance R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , capacitance C 2 、C 3 、C 4 , Diode D 3 、D 4 A detection circuit is formed, and the working principle of the circuit is also to judge whether the energy-saving lamp is in the rectification state by detecting the asymmetry of the positive and negative amplitudes of the AC voltage drop of the lamp. Its specific description is the same as the aforementioned circuit.

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PUM

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Abstract

The invention relates to a fluorescent lamp electronic ballast having an electronic protection device, which comprises tube voltage positive and negative peak value sample circuit connected to an electronic rectifier, and a positive and negative peak voltage signal adding circuit, which is connected to an absolute value comparator, the circuit divides potential drop to the energy conserving tube alternating current voltage, obtaining the positive phase peak value and the negative phase peak value of the tube voltage, the positive and negative peak voltage signal are added for comparison and judgment and the control circuit determines whether to stop oscillations. Compared with the prior art technology, the advantages of the present invention are flexible design, low cost and wide adaptability. íí

Description

technical field [0001] The invention relates to an electric light source, especially an electronic ballast for a fluorescent lamp with an electronic protection device. Background technique [0002] During the use of electronic ballasts for fluorescent lamps in the prior art, as the lamp tube ages, the thermionic emission energy of the cathode of the filament decreases gradually, and the voltage of the lamp tube increases. The electron emission ability of each filament cathode is different, and the positive and negative parts of the alternating current flowing through the lamp tube are also different, that is, the so-called "rectification effect" is produced, resulting in a significant increase in the filament voltage and a sharp rise in the temperature of the filament electrode, which makes the electronic rectifier due to The output power is too large to fail. Therefore, the electronic energy-saving lamps powered by high-frequency AC in the prior art all have rectification ...

Claims

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Application Information

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IPC IPC(8): H05B41/14
Inventor 程国平
Owner 上海虎能电器有限公司