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·
 Active Absorption of Hybrid Rectifier Circuit 
·
 Parallel clamping flyback circuit 
·
 A over-voltage protection circuit of switching pow 
·
 A buck converter circuit 
·
 A timing sequence tracing control circuit 
·
 Multiplexed output telecommunication system 
·
 OCP circuit multiplexed output power 
·
 Power switch-off delay circuit 
·
 Ringer power secondary inverter power tube driver 
·
 Synchronous rectification driver of converter 

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