Abstract: The present invention relates to a lamp illumination system and method for sharing power to an electrical DC load that exceeds a capacity of a first DC power supply between the first DC power supply and a second DC power supply such that in combination all of the power supplies are able to provide rated load power, said method comprising: connecting across the load the first and second DC power supplies each having a respective partial series resonance converter that produces during alternate switching cycles an output voltage across respective resonance capacitors thereof and each converter being operable in clamping mode; and operating the converter of the first DC power supply in clamping mode so as to limit an output voltage across the respective resonance capacitors thereof and thereby prevent the first DC power supply from attempting to source a load that exceeds a nominal power rating of the first DC power supply within a predetermined accuracy, whereby any power shortfall to the load is provided by th

Abstract: An electronic transformer for lighting includes a rectifier coupled to an inverter an output transformer (T1, T10) and a drive transformer (T2, T11). A protection mechanism (VR1, VR2) is responsively coupled to a winding of the output transformer and to a winding of the drive transformer such that the voltage across each of the windings are approximately equal and opposite during normal operation but differ substantially during a short-circuit.