Novel double-sampling abnormal protection circuit electronic ballast

Abstract

The invention discloses a novel double-sampling abnormal protection circuit electronic ballast, which comprises an electro magnetic compatibility (EMC) filter circuit, a bridge rectifier, a high oscillation circuit, a resonance inductor, and an abnormal protection circuit connected with the high oscillation circuit and the resonance inductor, which are connected in turn. The resonance inductor consists of a primary winding and a secondary winding. One end of the primary winding of the resonance inductor is connected with a light source, and the middle point of the secondary winding of the resonance inductor is grounded. The winding head of the secondary winding and the middle point of the secondary winding form a first winding; and the winding tail of the secondary winding and the middle point of the secondary winding form a second winding. The safety of the novel double-sampling abnormal protective circuit electronic ballast is not influenced when the electronic ballast works under the abnormal condition at any voltage value of 90 to 110 percent of the rated supply voltage and the and the ballast does not make a lamp cap overheat when the life service of the lamp is ended.

Description

[technical field] [0001] The invention discloses a novel double-sampling abnormal protection circuit electronic ballast. [Background technique] [0002] Lamp control device: electronic ballasts, most of the electronic ballasts in the existing market use discrete devices to form abnormal protection circuits. When working under an abnormal voltage value, safety is easily compromised, and at the end of the life of the lamp, the ballast will cause the lamp cap to overheat, which is difficult to meet the special requirements of AC electronic ballasts for fluorescent lamps (GB19510 .4-2009 / IEC61347-2-3:2000), making AC electronic ballasts with low-cost abnormal protection circuits composed of discrete components pass the rectification effect test and the asymmetric power test in the partial rectification effect. The main direction of technological breakthroughs. [Content of the invention] [0003] The present invention overcomes the deficiencies of the above-mentioned technolo...

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Problems solved by technology

[0002] Lamp control device: electronic ballasts, most of the electronic ballasts in the existing market use discrete devices to form abnormal protection circuits. When working under an abnormal voltage value, safety is easily compromised, and at the end of the life of the lamp, the ballast will cause the lamp cap to overheat, which is difficult to meet the special requirements of AC electronic ballasts for fluorescent lamps (GB19510 .4-2009 / IEC61347-2-3:2000), making AC electronic ballasts with low-cost abnormal protection circuits composed of discrete components pass the rectification effect test and the asymmetric power test in the partial rectification effect. Technical research, the main direction of breakthrough

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