Abstract: A method for synchronizing startup of a plurality of power supplies in an electrical system includes supplying input power to a first power supply to supply power to an auxiliary converter and an auxiliary controller. The method also includes monitoring, via the auxiliary controller, a signal shared by each of the plurality of power supplies. The method further includes incrementally increasing, via the auxiliary controller, a value of the shared signal to a next incremental value of a plurality of specified values. The method also includes enabling, via the auxiliary controller, each of the power supplies to supply power to a load when the value of the shared signal is set to a maximum value of the specified values.

Abstract: A power supply may include a power input to connect to a power source to receive an input power for the power supply, a bulk capacitor operatively connected to the power input, and a threshold manager having a processor operatively connected to the power input and the bulk capacitor. The threshold manager to monitor the input power, calculate a threshold to perform a shutdown operation based on a shutdown requirement provided by a computing device, and in response to a power loss of the input power, monitor a bulk voltage of the bulk capacitor and send an alert to the computing device to perform the shutdown operation when the bulk voltage meets the threshold.

Abstract: Example implementations relate to determining a failure event of a power supply. In some examples, an apparatus may comprise logic circuitry coupled to a signal line, the logic circuitry to receive a monitor signal via the signal line, where the monitor signal corresponds to an internal voltage of a power supply that is consumed wholly by the power supply, compare the monitor signal to a reference signal, and determine, based on the comparison, whether a failure event has occurred in the power supply.

Abstract: Systems and switching energy sources are provided for power rail transient compensation. One system includes a voltage regulator having an output coupled to a power rail; a switching energy source configured to provide a determined amount of energy to the power rail responsive to a current transient on the power rail exceeding a determined rate of change; and a timer circuit configured to turn off the switching energy source a determined interval after the switching energy source begins to provide the determined amount of energy to the power rail.

Abstract: An example system includes a server including a power supply and a microcontroller. The power supply may store parameters for a plurality of different ranges of overcurrent and a plurality of corresponding different time periods. The power supply may also receive information from the electrical component corresponding to the speed at which the electrical component can reduce the amount of power the electrical component is consuming. The controller may receive information from the power supply to determine the amount of current that will cause an overcurrent event in the electrical component. The controller may signal the electrical component to reduce the amount of power the electrical component is drawing from the power supply in response to the detected amount of current corresponding to the overcurrent event.

Abstract: A system including multiple power supplies is provided. Each of the power supplies is configured to provide a standby power to a management unit in the system through a standby output and a main power through a main output, when an input power signal has been received for the system. The system also includes a resistor configured to receive a standby signal from each of the power supplies to raise a signal voltage, wherein the standby signal is a pre-selected current. The system also includes a controller in each of the power supplies, the controller configured to raise the signal voltage to the specified value when the signal voltage is greater than a threshold, and to enable the standby power from a respective power supply to reach the management unit when the signal voltage is within the specified value. A method to use the above system for a synchronized power supply to a management unit is also provided.

Abstract: Various examples provide systems and methods in which a capacitor is charged by an active first power factor correction module and a voltage across the capacitor is determined while the second power factor correction module is exclusively active. A health state of the second power factor correction module may be determined based on the determined voltage across the capacitor.

Abstract: In some examples, an Emergency Power Off (EPO) device can be connected to a non-EPO port of a computing device, and the EPO device can provide an EPO signal via the non-EPO port to a manager connected to an energy storage device of the computing device, wherein the EPO signal comprises instructions to power off the energy storage device.

Abstract: An electronic fuse (e-fuse) for controlling input current of a load includes a transistor switch and a transorb device that is coupled in parallel to the transistor switch between a source and a drain of the transistor switch. A circuit comprising the transistor switch and the transorb device in parallel comprises a first end and a second end. The first end of the circuit is coupled to a power bus. The second end of the circuit is coupled to a first node of the load. The e-fuse includes an RC circuit comprising a resistor coupled in series with a first capacitor. The RC circuit is coupled between the power bus at the first end of the circuit and a return. The return is coupled to a second node of the load. The e-fuse includes a second capacitor that is coupled between the return and the second end of the circuit.

Abstract: A method for detecting thermal events in an electrical system includes: synchronizing, via a controller, measurements of power consumed by each of a plurality of load elements during an interval with one another and with measurements of power supplied by each of a plurality of power sources to the plurality of load elements during the interval; determining a differential between a sum of the power consumed by the load elements during the interval and a sum of the power supplied by the power sources to the plurality of load elements during the interval; comparing the differential to a predetermined threshold; and determining whether a thermal event has occurred based on the comparison of the differential to the predetermined threshold.

Abstract: A supplemental power supply system of a computing device may determine an occurrence of a transient at a processor of the computing device having a first electrical power supplied by a primary power supply of the computing device different from the supplemental power supply system. A discharging circuitry of the supplemental power supply system may, in response to determining the occurrence of the transient: discharge electrical energy from energy storage of the supplemental power supply system and supply a second electrical power to the processor using the electrical energy discharged from the energy storage.

Abstract: An example system includes a failure detection circuit. The failure detection circuit is to detect a failure of a first power source electrically coupled to a first load. The failure detection circuit is to output a first signal indicating the detection of the failure of the first power source. The system also includes a current regulating circuit. The current regulating circuit is electrically coupled to the failure detection circuit. The current regulating circuit is to electrically couple a second power source to the first load based on the first signal output by the failure detection circuit. The current regulating circuit is to restrict a first current from the second power source.

Abstract: A method for synchronizing startup of a plurality of power supplies in an electrical system includes supplying input power to a first power supply to supply power to an auxiliary converter and an auxiliary controller. The method also includes monitoring, via the auxiliary controller, a signal shared by each of the plurality of power supplies. The method further includes incrementally increasing, via the auxiliary controller, a value of the shared signal to a next incremental value of a plurality of specified values. The method also includes enabling, via the auxiliary controller, each of the power supplies to supply power to a load when the value of the shared signal is set to a maximum value of the specified values.

Abstract: A method for detecting thermal events in an electrical system includes: synchronizing, via a controller, measurements of power consumed by each of a plurality of load elements during an interval with one another and with measurements of power supplied by each of a plurality of power sources to the plurality of load elements during the interval; determining a differential between a sum of the power consumed by the load elements during the interval and a sum of the power supplied by the power sources to the plurality of load elements during the interval; comparing the differential to a predetermined threshold; and determining whether a thermal event has occurred based on the comparison of the differential to the predetermined threshold.

Abstract: Various examples provide systems and methods in which a capacitor is charged by an active first power factor correction module and a voltage across the capacitor is determined while the second power factor correction module is exclusively active. A health state of the second power factor correction module may be determined based on the determined voltage across the capacitor.

Abstract: An example system includes a control interface and a device coupled to the control interface. The control interface may generate a parameter. The device may receive the parameter from the control interface, generate a switching waveform and current reference, adjust the switching waveform to generate an output current, and adjust the output current by using an error amplifier to provide an output current that conforms to at least one parameter.

Abstract: Examples disclosed herein relate to multi-node system fault management. In some of the examples disclosed herein, a fault detection circuit may distinguish between normal operating conditions of a multi-node system and faults that occur between the overcurrent protection of the system's power supplies and the hot plug protection of the system's nodes. The fault detection circuit may detect these faults by monitoring a voltage at the node's backplane connector prior to the input of the node's hot plug protection interface. If the magnitude of the monitored voltage drops below a threshold voltage at a rate that exceeds a threshold rate, the fault detection circuit may determine that a fault has occurred and may communicate the fault to the power supplies. The power supplies may receive the fault communication and shut off their power outputs to prevent the fault from causing damage to the components in the system.

Abstract: A power factor correcting (PFC) boost converter is to convert an input to an intermediate DC signal. A direct current (DC)-DC converter is to receive the intermediate DC signal and generate an output associated with an online condition. In response to a light-load indication, the PFC boost converter is to assume a disabled status to pass a rectified input to the DC-DC converter. The DC-DC converter is to convert the rectified input to generate the output associated with a light-load condition. The light-load condition output is provided at a voltage lower than the online condition output.

Abstract: An example system includes a server including a power supply and a microcontroller. The power supply may store parameters for a plurality of different ranges of overcurrent and a plurality of corresponding different time periods. The power supply may also receive information from the electrical component corresponding to the speed at which the electrical component can reduce the amount of power the electrical component is consuming. The controller may receive information from the power supply to determine the amount of current that will cause an overcurrent event in the electrical component. The controller may signal the electrical component to reduce the amount of power the electrical component is drawing from the power supply in response to the detected amount of current corresponding to the overcurrent event.

Abstract: An example system includes a control interface and a device coupled to the control interface. The control interface may generate a parameter. The device may receive the parameter from the control interface, generate a switching waveform and current reference, adjust the switching waveform to generate an output current, and adjust the output current by using an error amplifier to provide an output current that conforms to at least one parameter.