USB principal and subordinate and power supply switched systems

The utility model provides a USB principal and subordinate and power supply switched systems, including USB interface circuit, OTG_ID control circuit, power supply switching circuit and host system, host system switches circuit connection with USB interface circuit, OTG_ID control circuit and power supply respectively, USB interface circuit still is connected to the power supply switching circuit,OTG_ID control circuit still is connected to socket CN2. The utility model discloses saved interface resource, the cost is reduced, improved circuit's reliability and the complexity who reduces the design are used in on the on -vehicle multimedia terminal product and shipment in batches, have brought very big convenience for the debugging. 本实用新型提供了种USB主从与供电切换系统，包括USB接口电路、OTG_ID控制电路、供电切换电路及主控模块，所述主控模块分别与USB接口电路、OTG_ID控制电路及供电切换电路连接，所述USB接口电路还连接至供电切换电路，所述OTG_ID控制电路还连接至插座CN2。本实用新型节省了接口资源，降低了成本，提高电路的可靠性和降低设计的复杂程度，用在车载多媒体终端产品上并批量出货，为调试带来了很大的方便。