说明：  为一家电动自行车厂家设计的电路，里面有protel原理图+pcb，控制器是C8051，各种保护电路都有，此电路已成功在实验平台上调试通过，性价比高，请放心参考。研发电动车驱动电路的朋友不妨看看哦。
(An electric bicycle manufacturers to design circuit, there are Protel schematic+ pcb, controller is C8051, there are all kinds of protection circuits, the circuit has been successfully in the experimental platform debugging through, please rest assured reference. Research and development of electric vehicles drive circuit is useful to look at, oh friend.)