Time filter

Source Type

Camarillo, CA, United States

A multiphase DC-DC converter includes multiple groups of first and second LLC power trains coupled in parallel which collectively provide an output voltage to a load. A voltage feedback control loop senses an output voltage for the LLC converter and generates an identical reference current signal for each of the multiple groups of power trains, the signals representing a reference current based on the sensed output voltage, wherein an active current sharing operation is provided between each of the groups. A local current control loop for each of the groups generates PWM control signals to each of the respective first and second power trains based on the reference current, the PWM control signals having an identical frequency but out of phase with respect to each other, wherein a passive current sharing operation is provided within each of the plurality of power groups.

An AC-DC power converter is provided with two pairs of self-driven synchronous rectifier switches in addition to, or in place of, diode bridge rectifiers for boosting efficiency and reducing cost. An AC sensing circuit is coupled to AC input terminals, and a DC level shifting circuit applies a DC offset to an AC input signal received via the sensing circuit. A comparator circuit determines positive and negative half waves of the AC input signal relative to the DC offset value. Gate drive signals are provided for driving a first set of parallel rectifier switches during a positive half cycle of the AC input signal, and for driving a second and opposing pair of parallel rectifier switches during a negative half cycle of the AC input signal. In an embodiment, high side gate drive signals may be electrically isolated from the active rectifier control circuitry.

The invention provides a method and system for managing energy consumption for efficient recording, monitoring, control of electricity or energy usage and payment collection for the same. The energy consumption recording method for managing energy consumption multiple host users, comprises steps for collating electricity meter data from each meter associated with the each host user, through a data concentrator unit, wherein the data concentrator unit comprises at least one sensor for each electricity source associated with the each meter. Method further includes a step for translating the electricity meter data from each meter into the meter indicative parameters for each host user, communicating these meter indicative parameters to a meter data management database, and recording the meter indicative parameters for each host user in the meter data management database. These recorded parameters include dynamic usage information and further used in analytics useful for monitoring, control and payment collections.

A method for clock recovery and data recovery from a data stream on a communication channel includes sampling a data stream on the communication channel at a sampling frequency determined by a clock signal and generating a sampled signal. The method further includes determining a phase shift between the communication data stream and the sampled signal and modifying the phase of the clock signal on the basis of the phase shift to obtain a desired phase difference between the sampled signal and the data stream.

A resonant power converter is provided with auxiliary circuit branches and control circuitry for switchably coupling the auxiliary branches to resonant circuit components during holdup times. Auxiliary branches are coupled in parallel with any one or more of a resonant inductor, a resonant capacitor, and a magnetizing inductive winding via respective switches. When a holdup time condition is detected in accordance with, for example, a drop in the mains line voltage, the switches are controlled to adjust the corresponding inductance or capacitance for the duration of the holdup time condition or otherwise for a predetermined duration. The power converter in normal operation is configured for high efficiency and in a holdup time operation is configured to produce sufficient holdup time.

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