Novel　Forward-mode　AC-AC　converters　with　high　frequency　link　lay　the　key　technical　foundation　on　new-type　electronic　transformers,　regulated　sinusoidal　ac　power　supplies,　and　ac　regulators.　This　kind　of　converters　constitutes　of　input　cycloconverter,　high　frequency　transformer,　output　cycloconverter,　input　and　output　filters,　which　can　transfer　the　unsteady　input　AC　voltage　with　high　harmonic　into　the　steady　sinusoidal　voltage　with　low　harmonic.　The　converters　have　the　advantages　such　as　high　frequency　electrical　isolation,　concise　topology,　two-stage　power　conversion　(LFAC-HFAC-LFAC),　bi-directional　power　flow.　Circuit　configuration　and　topology,　control　strategy,　and　design　criteria　for　the　key　circuit　parameters　are　investigated.　The　designed　and　developed　1　kVA　220　V　±　10%50　HzAC/110　V50　HzAC　prototype　shows　that　the　converters　have　perfect　comprehensive　performances　such　as　good　output　waveforms,　high　efficiency,　high　power　density,　high　line　power　factor,　strong　adaptability　to　various　loads,　strong　over-load　ability,　low　audio　noise,　small　bulk　and　weight　etc.