120V, 220V Electronic Ballast Circuit for Twin 40 Watt Fluorescent Tubes

In this article we learn how to build a simple yet extremely reliable electronic ballast circuit for driving or operating two 40 watt fluorescent tubes, with an active power correction. Courtesy: https://www.irf.com/technical-info/appnotes/an-995a.pdf International Rectifier Control ICs are monolithic power integrated circuits suitable for operating low-side and high-side MOSFETs or lGBTs through logic level, referenced to … Read more

LED Tube Light Circuit Fitting in Standard Ballast Fixtures

In this article we will study a simple LED tube light circuit which could be directly replaced with faulty 40 watt T17 fluorescent tubes and fitted directly on the existing fixture. Thus the circuit is compatible with all standard iron ballast fixture assemblies. How Conventional Fixtures are Wired As shown in the below diagram, traditional … Read more

Mains 20 Watt Electronic Ballast Circuit

The post explains a simple 20 watt fluorescent ballast circuit using a single chip FAN7711 from Fairchild semiconductor. The proposed mains 220V operated, 20 watt fluorescent ballast circuit is built around an LCC resonant tank and a half-bridge network. Implementing Zero Voltage Switching The main features and operations may be understood with the following explanation: … Read more

Dimmable Ballast Circuit

The post explains a simple 25 to 36 watt ballast circuit which can used for all fluorescent tube applications within the allocated range.   The circuit of the proposed electronic fluorescent ballast may be understood through the following discussion: The Preheater Stage The half-bridge stage comprising the two mosfets are triggered by the IC for … Read more