The role of electronic ballast
Electronic ballast: fluorescent lamp electronic ballast, high-pressure sodium lamp electronic ballast, metal halide lamp electronic ballast. Due to adopt modern soft switch inverter technology and advanced active power factor correction technology and electronic filtering measures, has the very good electromagnetic compatibility, reduces the ballast loss itself.
Electronic ballasts using semiconductor electronic components, dc or low frequency ac voltage into a high frequency ac voltage, drive the low pressure gas discharge lamp (germicidal lamp, halogen tungsten lamp light work of the electronic control unit. The most widely used is the fluorescent lamp electronic ballast. Electronic ballast is generally adopts the AC/DC/AC method that HID in the high frequency (a few kHz to hundreds of kHz), which can be used within the electronic ballast small inductance can make HID stable work, or using the control technology, the current or the lamp power in a constant state, to achieve the effect of ballast, electronic ballast and power factor correction function normally, raise the input power factor, reduce the pollution to the grid. The most common current electronic ballast is the PFC rectifier + semi bridge resonance structure.
From the name is to know to be the ballast use, is to limit the current, of course the time that starts also is responsible for the lamp tube a high voltage!
Remove the glow and turn off the power and test the ballast. If the ballast is the older inductor, the inductor can test the coil if it is burned. This kind of old-style ballast is broken, usually the coil is burned, causing no voltage on both ends of the tube, causing the lamp to burn. There will be a lot of cases for electronic ballast. It is possible to measure the resistance of the three ballast and see whether the ballast is damaged. You can also change the glow and see if the burner is not disconnecting, and it's always on the path. So let's do substitution.
Electronic ballast used for gas discharge of electric light source (e.g., home of the fluorescent lamp), they are glowing by gas discharge principle, and the characteristics of the gas discharge is high voltage (kv) is needed to make the breakdown began to work, once after the breakdown, the resistance will be very low, at this time if we do not limit, there will be a large current flows through the electrode and burned them. The role of the electronic ballast is high voltage during light did not shine on its breakdown discharge began to work, then the limit of its current through in rating, can make the normal light.
