ELECTRONIC BALLAST HAVING PROTECTION VARISTOR FOR OVERVOLTAGE

摘要

The subject innovation is voltage being able to secure stable operation with the inside of the unit circuit of the ballast decreases below a predetermined range from the electric shock by employing a varistor the rising voltage of the lamp driving due to the ballast inside the derived time of lighting of the lamp overcharge relates to a ballast having a protective varistor, devised the present to this, the rectifying and smoothing portion to the full-wave rectification to the AC voltage of the power input unit 110, and receives power input unit 110 is a commercial AC power source to convert the DC voltage 120 and the rectifying and applying a DC power output from the smoothing unit 120 receives for supplying a driving power to the lamp in the lamp unit 140 to switch to a predetermined frequency according to a control operation of the IC chip (J12) in the electronic ballast comprising a lamp driving unit 130, are induced when the lighting lamp inside of the lamp driving unit 130 To which the voltage is the second varistor (VA2) in parallel connection to lower the voltage increase due to the excessive charging of the charging capacitor (C5) for the time of lighting to a predetermined voltage less than the inside charging capacitor (C5) for the being to be filled packing 131 It characterized.