The　intelligent　control　scheme　based　on　the　cascade　boost-chopper　was　proposed　for　low　voltage　supply　systems.　The　scheme　is　a　kind　of　indirect　energy　control　modes,　which　can　neatly　perform　the　voltage　transformation　and　current　transformation.　With　this　control　scheme,　the　close-loop　control　of　the　contactor　is　more　flexible　and　reliable.　Two　working　modes　of　the　control　module　were　elaborated　firstly;　Small-signal　analysis　and　corresponding　simulations　were　further　performed　for　the　control　module　to　guide　the　feedback　loop　design　of　the　boost　circuit.　The　relationship　between　adjustment　of　duty　cycle　and　audio　noise　of　solenoid　actuators　was　studied　on　the　basis　of　experiments.　Furthermore　the　method　to　suppress　electromagnetic　audio　noise　was　given　with　the　design　of　digital　current　loop　when　the　contactor　is　holding.　The　method　is　effective　for　intelligent　control　of　solenoid　actuators　in　contactors　under　different　exciting　voltages.　The　concept　and　method　of　control　scheme　were　verified　through　experimental　results.　©　2016　Chin.　Soc.　for　Elec.　Eng.