NOVELTY - The structure has an external synchronous rectifier power supply unit (1) comprising a side connected with an input end (71) of a live wire of a power supply. An internal synchronous rectifier power supply unit (2) comprises a side in connection with the input end of the live wire of the power supply. A synchronous integrated chopping unit (6) is controlled by an integrated driving circuit unit (4). A synchronous sampling terminal controls a synchronous load feedback control unit (5) and a synchronous voltage-stabilized control unit (3).    USE - Serial synchronous chopper structure for use with a live wire of a power supply to perform a perform alternating current (AC)/direct current (DC) dual-purpose synchronous chopping operation in a company, factory and a hospital. Can also be used for an electric car, uninterruptible power system (UPS) and a battery load management part of a solar panel.    ADVANTAGE - The structure can periodically perform alternating current (AC)/direct current (DC) dual-purpose synchronous chopping operation to provide synchronous DC voltage- stabilized output as fundamental power supply to a connected external circuit by performing forward/reverse connection of the chopper without damaging a component of the chopper caused due to connection to wrong electrode. The system utilizes an embedded switch inside a wall for supplying power to a lighting system to make power distribution to be flexible without using an additional transformer and a battery, thus reducing maintenance cost of the structure and decreasing environmental pollution.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of a serial synchronous chopper.    External synchronous rectifier power supply unit (1)    Internal synchronous rectifier power supply unit (2)    Synchronous voltage-stabilized control unit (3)    Integrated driving circuit unit (4)    Synchronous load feedback control unit (5)    Synchronous integrated chopping unit (6)    Input end of live wire of power supply (71)