Hi guys, can anyone explain to me how this circuit oscillating? thanks.
not to mention that the primary side is "hot" and should not have any exposed metal surfaces if it can be avoided (most manufacturers these days use plastic isolated TO220 transistor so the heatsink can be grounded (or they use heat sink insulators that can withstand the 1500V isolation requirements). also, with LTSpice, L1, L2, and L3 should also have a K spice directive coupling their mutual inductances as a transformer model.Note: Almost all internet schematics do not work and have errors. (including what I post)