Introduce topology circuit and ZCT-PWM converter topology circuit

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

Photocoupler

Each topology has its own characteristics and applications. Some topologies are suitable for off-line (grid-powered) AC/DC converters. Some of them are suitable for low power output (<200W), some are suitable for high power output; some are suitable for high voltage input (≥220V AC), some are suitable for 120V AC or lower input; some are for high voltage DC output (>~200V) or more Groups (4-5 groups or more) have advantages in output situations; some use fewer devices at the same output power or have a good compromise between device count and reliability. Smaller input/output ripple and noise are also factors that are often considered in selecting a topology.
Common topologies for switching power supplies: buck switching regulator topology, boost switching regulator topology, reverse polarity switching regulator topology, push-pull topology, forward converter topology, double-ended forward converter topology, interleaved forward converter topology, Half-bridge converter topology, full-bridge converter topology, flyback converter, current mode topology and current-fed topology, SCR harmonic topology, CUK converter topology.