This paper introduces a modified IPT pickup AC topology for stage lighting applications. The topology improves on previous work enabling lower switch ratings and improved waveform quality across the pick-up and at the light. Circuit analysis, simulations and measurements are presented that establish the relationship between the switch and the reactive elements for design. The circuit is shown to provide sinusoidal output waveforms across the load with lower peak values for a given RMS voltage or current level reducing noise and THD significantly while also improving efficiency. The new controller is implemented and used to power a 1.2 kW 240 V Philips Broadway lamp. Either feedback or feed-forward voltage control can used to control the output within 1% of that desired.

Traditional stage lighting systems inherently suffer significant cost in materials/installation and can be affected by audible noise when operating at mains frequency. A new circuit for stage lighting is introduced to mitigate these issues; it comprises a series tuned IPT pickup with a new AC control topology. This topology builds on previous work by improving the waveform across the load & pickup and by lowering the switch ratings. The circuit is analyzed, simulated and a working system is measured and presented herein, including the relationship between the switch and the reactive elements for the design. A 1.2 kW 240 V Philips Broadway lamp is successfully powered by this controller. The waveforms across the load are sinusoidal which lower the peak values for a given RMS voltage or current level, reducing noise and simplifying the design. The output voltage is regulated to 1% by implementing closed loop control on the system.