Power adapter, power device and output device

A power device in a power adapter, comprising:

• an input terminal configured to receive an input ac voltage;
• an ac-dc converter configured to convert the input ac voltage to an intermediate dc voltage, wherein the intermediate dc voltage is not tight regulated;
• at least two output ports configured to output the intermediate dc voltage respectively, wherein the intermediate dc voltage is not less than 5volts;
• and
• at least two output devices accompanied with the at least two output ports, wherein one of the at least two output devices comprise:
• a dc transmission cable, wherein a second termail of the dc transmission cable is detachably connected to one of the at least two output ports and configured to receive and transmit the intermediate dc voltage;
• and
• a connector connected to a first terminal of the dc transmission cable and configured to receive the intermediate dc voltage and output an output voltage to an external device, wherein the connector comprises:
• a first housing;
• a dc-dc converter enclosed in the first housing and configured to convert the intermediate dc voltage to the output voltage to the external device;
• and
• an output terminal is detachably connected to the external device to directly transmit the output voltage to the external device, wherein a node of the output terminal enclosed in the first housing is directly connected to the dc-dc converter to receive the output voltage and another node of the output terminal is plugged into the external device to directly transmit the output voltage to the external device,
• wherein the connector is detachably connected to the external devices and provide adjustable output voltage to the external devices.