Marine　electromagnetic　transmitter　transmits　large　power　electromagnetic　wave　to　the　seabed　for　obtaining　the　submarine　structure　and　mineral　resources.　However,　the　current　transmitter　has　the　problems　of　large　volume　and　low　transmission　power.　In　this　paper,　PWM　converter　is　used　to　construct　the　DC-DC　controllable　source　circuit.　Since　the　conventional　zero　voltage　switching　full　bridge　(ZVS-FB)　PWM　converter　has　many　limitations,　such　as　high　loop　energy,　loss　of　duty　cycle　and　limited　ZVS　range　of　lagging　bridge　arm,　a　zero　voltage　zero　current　switching　full　bridge　(ZVZCS-FB)　controlled　source　circuit　is　proposed　using　asymmetric　phase-shifted　control.　The　operating　process　and　circuit　characteristics　of　ZVZCS-FB-PWM　DC-DC　controlled　source　circuit　are　analyzed,　including　the　maximum　control　duty　ratio,　reset　primary　current　and　capacitance,　the　loss　of　the　duty　ratio,　the　switching　loss　and　energy　circulation　etc.　Simulation　and　experimental　results　show　that　the　DC-DC　controlled　source　circuit　realizes　the　leading-leg　switches　to　be　operated　with　ZCS　turn-on　and　ZVS　turn-off,　the　lagging-leg　switches　with　ZCS　turn-on　and　turn　off.　The　circuit　efficiency　and　power　density　are　accordingly　improved.　©　2017,　The　editorial　office　of　Transaction　of　China　Electrotechnical　Society.　All　right　reserved.