REDUCING IDLE-TIME ENERGY CONSUMPTION IN UNIVERSAL SERIAL BUS POWER DELIVERY CIRCUITRY OF POWER ADAPTERS

摘要

A Universal Serial Bus (USB) Power Delivery (PD) power adapter includes circuitry to control an electrical connection to a source of power—such as, for example, an external mains power source—based on detecting presence or absence of an electrical load of a power-consumer device. Presence is sensed using a USB Configuration Channel (CC) responsible for serial data communications between the USB PD power adapter and the power-consumer device. Accordingly, the USB communication signal lines are used to sense whether the power-consumer device is connected to the USB PD power adapter so that it may switchably disrupt the source of input power flowing from the source, through power converting and regulating circuitry, and to USB power signal lines (USB V_BUS and USB Ground) accompanying the USB communication signal lines in a USB power jack connector operatively connectable to the power-consumer device.