摘要:
Apparatus related to power factor are provided. A power supply provides regulated power to a load or loads. The power supply is coupled to a source of alternating-current (AC) voltage. A controller monitors the AC input voltage and a current loading of the power supply. The controller determines an activation time according to the monitoring and asserts a signal prior to a next zero crossing of the input voltage. The signal causes impedance circuitry to be coupled between a pair of input nodes, resulting in a lagging power-factor. The impedance circuitry is de-coupled from at least one of the input nodes after the zero crossing.
摘要:
A power regulators system and method is disclosed. In one embodiment, a power regulator system (10) is provided and includes at least one power supply (16) each configured to convert a DC rail voltage to a DC load voltage. The DC load voltage can be less than the DC rail voltage and can be provided to power at least one electronic component. The system (10) also includes a power rail regulator (12) configured to generate the DC rail voltage based on an input voltage and to regulate a magnitude of the DC rail voltage to vary between a minimum voltage magnitude and a maximum voltage magnitude and to regulate a variable magnitude of an output current. The DC rail voltage and the output current can be regulated based on load requirements associated with the at least one electronic component (18).
摘要:
An electric energy distribution system may include plural loads configured to receive electric energy from a common feed or branch. Each of the loads may be configured to operate in at least first and second modes such that it may consume current, VA or power up to a first cap when running in its first mode and up to a second cap when running in its second mode. The first cap may be higher than the second cap. A sensor component may monitor a parameter that corresponds to an aggregate amount of electric energy being consumed by all of the plural loads from the common feed or branch. A manager component may be configured, when the parameter meets or exceeds the threshold, to select one of the loads currently running in its first mode and to cause the selected load to run in its second mode.
摘要:
One embodiment provides a system for controlling one or more pulse width modulated (PWM) fans. The system can include a control system configured to provide a voltage control signal corresponding to a DC output voltage for the one or more PWM fans. A variable DC voltage source is configured to supply the DC output voltage to the plurality of fans at one of at least two different DC voltages based on the voltage control signal. The DC output voltage from the variable DC voltage source is separate from a PWM control signal that is also supplied to the PWM fans.
摘要:
A system and method for detecting a circulating current in a redundant AC-DC power supply is disclosed. In one embodiment, a redundant AC-DC power supply system can include a first AC-DC power converter that is configured to generate a first DC output. A second AC-DC power converter is configured to generate a second DC output. An output circuit is configured to provide an output voltage based on at least one of the first and second DC outputs. A controller is configured to control the first and second AC-DC power converters for providing at least one of the first and second DC outputs to the output circuit, the controller being configured to detect a circulating current condition in at least one idle converter of first and second AC-DC power converters.
摘要:
A redundant AC-DC power supply system and method is disclosed. A first AC-DC power converter is configured to generate a first output voltage and a first relay is configured to selectively couple and decouple the first AC-DC power converter to an output of an output circuit. A second AC-DC power converter is configured to generate a second output voltage. A second relay is configured to selectively couple and decouple the second AC-DC power converter to the output. A controller is configured to operate the first and second AC-DC power converters and the first and second relays to provide redundant sources of power for the output and to mitigate circulating current flow between the first and second AC-DC power converters.
摘要:
A system and method for detecting a circulating current in a redundant AC-DC power supply is disclosed. In one embodiment, a redundant AC-DC power supply system can include a first AC-DC power converter that is configured to generate a first DC output. A second AC-DC power converter is configured to generate a second DC output. An output circuit is configured to provide an output voltage based on at least one of the first and second DC outputs. A controller is configured to control the first and second AC-DC power converters for providing at least one of the first and second DC outputs to the output circuit, the controller being configured to detect a circulating current condition in at least one idle converter of first and second AC-DC power converters.
摘要:
One embodiment provides a system for controlling one or more pulse width modulated (PWM) fans. The system can include a control system configured to provide a voltage control signal corresponding to a DC output voltage for the one or more PWM fans. A variable DC voltage source is configured to supply the DC output voltage to the plurality of fans at one of at least two different DC voltages based on the voltage control signal. The DC output voltage from the variable DC voltage source is separate from a PWM control signal that is also supplied to the PWM fans.
摘要:
A system is provided for powering electronic system modules in an equipment rack. A circuit breaker is mounted to the rack and configured to receive a rack AC power feed. An AC-DC converter module is mounted to the rack and configured to receive the rack AC power feed from the circuit breaker and to convert it to a first DC voltage at an output. A set of switching DC-DC output converters is provided. Each is disposed physically proximate to or within one of the electronic system modules and is configured to convert the first DC voltage to a second DC voltage suitable for consumption by the proximate electronic system module. A bus is configured to distribute the first DC voltage from the output to each of the switching DC-DC output converters.
摘要:
Plural electric power supplies are connected in parallel to an output bus. The plural supplies include a primary power supply and a redundant switching power supply. The primary power supply is configured to provide output current to a load when the primary power supply is operating normally. The redundant supply is configured to remain online while not providing output current to the load when the primary power supply is operating normally, but to begin providing output current to the load when the primary power supply is not operating normally.