Patent ID: 7886104

Claim:
A detachable adapter, for being detachably connected to a host data bus of a receptacle of a portable device, the adapter comprising: a first receptacle, detachably coupled to a first data bus of a first electronic device; a second receptacle, detachably coupled to a second data bus of a second electronic device; a plug, detachably coupled to the host data bus of the receptacle of portable device, for providing a set of host bus signals on the host data bus of the portable device, wherein the set of host bus signals comprises a data signal, a connection status signal, and a power signal, and the first receptacle is coupled to the plug so that at least a data signal line and a power signal line of the first data bus of the first electronic device are respectively coupled to at least a data signal line and a power signal line of the host data bus; and a conversion circuit, coupled to the second data bus of the second receptacle, for determining whether the second electronic device is connected to the second receptacle according to at least a signal obtained from the second data bus, and providing the connection status signal on the plug so that the portable device obtains connection status of the adapter, wherein if the conversion circuit determines that the second electronic device is connected to the second receptacle, the conversion circuit outputs a power signal obtained from the second data bus to the plug to serve as the power signal of the host bus signals, and outputs the power signal to the first receptacle to serve as a power signal of the first data bus.