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,