Abstract: Techniques for alternating current (AC) powering methods deployed at a power transmitter and a power receiver for line fault detection. AC power is applied to a pair of lines at a power transmitter to transmit the AC power to a power receiver. An occurrence of a predetermined characteristic of an AC voltage waveform or an AC current waveform is detected. The AC power is disconnected from the pair of lines upon detecting occurrence of the predetermined characteristic. Fault detection is performed during a safety check time window upon disconnecting the AC power from the pair of lines. The AC power is reconnected to the pair of lines when a fault is not detected from the fault detection during the safety check time window, and the AC power is maintained disconnected from the pair of lines when a fault is detected during the safety check time window.

Abstract: Techniques for alternating current (AC) powering methods deployed at a power transmitter and a power receiver for line fault detection. AC power is applied to a pair of lines at a power transmitter to transmit the AC power to a power receiver. An occurrence of a predetermined characteristic of an AC voltage waveform or an AC current waveform is detected. The AC power is disconnected from the pair of lines upon detecting occurrence of the predetermined characteristic. Fault detection is performed during a safety check time window upon disconnecting the AC power from the pair of lines. The AC power is reconnected to the pair of lines when a fault is not detected from the fault detection during the safety check time window, and the AC power is maintained disconnected from the pair of lines when a fault is detected during the safety check time window.

Abstract: Techniques for alternating current (AC) powering methods deployed at a power transmitter and a power receiver for line fault detection. AC power is applied to a pair of lines at a power transmitter to transmit the AC power to a power receiver. An occurrence of a predetermined characteristic of an AC voltage waveform or an AC current waveform is detected. The AC power is disconnected from the pair of lines upon detecting occurrence of the predetermined characteristic. Fault detection is performed during a safety check time window upon disconnecting the AC power from the pair of lines. The AC power is reconnected to the pair of lines when a fault is not detected from the fault detection during the safety check time window, and the AC power is maintained disconnected from the pair of lines when a fault is detected during the safety check time window.

Abstract: Devices, systems, methods, and processes for operating a plurality of power supplies of a network device using cold redundancy are described herein. Traditionally, redundant power supplies are operated in parallel with primary power supplies, thus making power supply system less efficient. To address these issues, an analog architecture is provided for implementing cold redundancy in a network device. Each power supply includes two pins: one for designating the power supply as primary or secondary, and the other pin for configuring an activity state of the power supply. The activity state can be an active state or a sleep state. The secondary power supplies are further ranked in an order of priority using different voltage levels for assignment. In response to surge in load demand, activity states of one or more secondary power supplies are changed to the active state without requiring a signal from a centralized control software.

Abstract: Devices, systems, methods, and processes for dynamically controlling power supplied from power supply units (PSUs) and battery units of network devices are described herein. Generally, network devices rely on redundant power supplies or large hold-up capacitors to address power supply issues. Redundant power supplies lead to sub-optimal efficiency, while hold-up capacitors lead to bulky network device taking up space within the PSUs. Therefore, the present disclosure describes disposing one or more battery units in linecard slots or PSU slots. The battery unit may provide redundancy for the power supply and can act as an effective filter for power signal fluctuations. The battery units and the PSUs are dynamically controlled based on a load demand associated with the network device and power supply sources connected to the network device. Thus, the battery unit actively participates in load sharing with the PSUs to operate the PSUs more efficiently.

Abstract: In one embodiment, a power delivery apparatus includes a power transmitter configured to generate a power waveform at a first voltage. The power waveform includes a series of successive on-times that are separated by an off-time. A transformer is coupled to the power transmitter, wherein the transformer is configured to receive the power waveform and perform a single step down conversion of the power waveform at the first voltage to an output waveform at a second voltage. A rectifier circuit is coupled to the transformer to receive the output waveform and produce a direct current (DC) rail voltage for use by one or more power consuming devices.

Abstract: A multi-output, multi-directional power converter has an input bi-directional switch and at least a first output bi-directional switch, a coupled inductor having an input winding and at least one output winding. The coupled inductor input winding is connected in series with the input voltage source and an input bi-directional switch. Each coupled inductor output winding is connected in series with a corresponding output voltage source such as a capacitor and its respective output bi-directional switch. A clock circuit provides a first and second control signal. Each control signal has a first and second state. The second control signal has a state that is the complement of the first control signal. The first control signal is connected to the input bi-directional switch control terminal and the second control signal is connected to each respective output bi-directional switch control terminal.