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Preheating circuit applied to fluorescent lamp electronic ballast

A technology for electronic ballasts and preheating circuits, applied to light sources, electric light sources, electrical components, etc., can solve problems such as reducing the efficiency of ballasts, and achieve the effect of improving efficiency

Inactive Publication Date: 2011-08-31
WUJIANG HUANENG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is also a PTC thermistor at both ends of the output to realize the preheating and starting of the lamp tube. Although this method can effectively improve the switching life of the lamp tube, the PTC thermistor still needs to be used when the lamp tube is working normally. Consumes extra energy, thus reducing the efficiency of the ballast

Method used

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  • Preheating circuit applied to fluorescent lamp electronic ballast
  • Preheating circuit applied to fluorescent lamp electronic ballast

Examples

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Embodiment Construction

[0010] Below in conjunction with accompanying drawing, preferred specific embodiment of the present invention is described:

[0011] For example, 1 shows part of the circuit of the electronic ballast, which mainly includes the self-excited ring drive circuit and the preheating circuit. A driving resistor R1 and a second driving resistor R2, a power transistor Q1 whose base is connected between the first driving resistor R1 and the second driving resistor R2, and an emitter of the power transistor Q1 is connected to the other end of the second driving resistor R2.

[0012] The preheating circuit includes a diode D and a first capacitor C1 connected in series to the secondary winding T of the magnetic ring, a third resistor R3 and a second capacitor C2 connected in parallel to the first capacitor C1 in series, and the diode D and the first control switch S1 connected in parallel with the series branch of the first capacitor C1, and the second control switch S2 connected in paral...

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PUM

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Abstract

The invention relates to a preheating circuit applied to a fluorescent lamp electronic ballast, which comprises a diode and a first capacitor which are connected in series and are then connected with a secondary winding of a magnetic ring in parallel, a third resistor and a second capacitor which are connected in series and are then connected with the first capacitor in parallel, a first controlswitch which are connected with the diode and the serial-connecting branch of the first capacitor in parallel, and a second control switch which is connected with the third resistor and the serial-connecting branch of the second capacitor in parallel, when a self-exciting magnetic ring driving circuit to start, the first capacitor and the second capacitor are sequentially charged, and the first control switch and the second control switch are alternatively closed and opened. In the preheating circuit, the control switch drives the secondary side current of the magnetic ring to change the working efficiency of a half-bridge line, so that the preheating start to a lamp tube is realized by controlling the voltages at the two ends of the lamp tube, no extra energy consumption is needed, and the efficiency of the ballast is improved.

Description

[0001] technical field [0002] The invention relates to an electronic ballast for a fluorescent lamp. Background technique [0003] Fluorescent lamps are mostly driven by electronic ballasts. In electronic ballasts, self-excitation circuits driven by magnetic rings are widely used at present, but this circuit is an instantaneous start circuit without lamp preheating function. Therefore, the switching life of the lamp tube is relatively low. . In the prior art, there is also a PTC thermistor at both ends of the output to realize the preheating and starting of the lamp tube. Although this method can effectively improve the switching life of the lamp tube, the PTC thermistor still needs to be used when the lamp tube is working normally. An additional part of energy is consumed, thus reducing the efficiency of the ballast. Contents of the invention [0004] The object of the present invention is to provide a preheating circuit for electronic ballasts without additional ...

Claims

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Application Information

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IPC IPC(8): H05B41/295
CPCH05B41/295
Inventor 罗玛张顺法周正国郜超
Owner WUJIANG HUANENG ELECTRONICS
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