A 3-phase zero-voltage switching scheme using a dual timer LM556
S. Ashoka Krishna Bhat · International Journal of Electronics · 1979
The use of a single dual time LM5561C for 3-phase (3-⊘) zero-voltage switching by sensing the 3-⊘ ripple is explained. The use of reset terminals gives the circuit the on/off control and makes the power circuit protection simpler.