USB Power Distribution Management System

摘要

A system providing an optimized power delivery and management of USB power in a closed network, such as found on commercial aircraft. The system enables utilization of a limited number of AC-DC step down and isolation converters to support a multitude of USB power outlets. It provides a means of accounting for, and overcoming wire distribution losses, while also providing for voltages and power levels compatible with the USB Power Delivery Specification.

主权项

1. A power management system comprising:
a) a power converter, comprising;
i) a power supply having an input coupled a supply of power and a DC output; andii) an output power monitor sensing power delivered by the power converter to the DC output, having a signal output, the output power monitor being configured to initiate a power management condition on the signal output when the power delivered by the power converter exceeds a predetermined level; b) a distribution bus coupled to the DC output of the power supply and to the signal output of the output power monitor; c) a plurality of local smart outlets, each comprising:
i) a power input coupled to the distribution bus;ii) a local control circuit having an input coupled to the power input and an output, comprising:
A) a carrier signal discriminator having an input coupled to the distribution bus and an output, the carrier signal discriminator being configured to provide a signal when the carrier signal discriminator determines that a power management condition has been issued by the output power monitor;B) a shutdown logic and timer circuit comprising an input coupled to the output of the carrier signal discriminator, a timer having a first time delay, and an output; the shutdown logic and timer circuit being configured to start the timer upon detection of the signal on the output of the carrier signal discriminator, and upon expiration of the first time delay, if the signal on the output of the carrier signal discriminator is still present, raising a shutdown signal on the output; andC) a power regulator having an input coupled to the power input, a control input coupled to the output of the shutdown logic and timer circuit, and at least one output supplying regulated power, the power regulator being configured to stop supplying regulated power to the at least one output in response to the shutdown signal from the shutdown logic and timer circuit on the control input; andiii) a USB connector for powering a device, coupled to the at least one output of the power regulator of the local control circuit.