Abstract:
Power-packet-switching circuits (and methods and systems) in which at least one port uses series-connected combinations of bidirectional switches to connect a link inductor (or transformer), with selectable polarity, to an outside line. Optionally, series-connected combinations of bidirectional switches are used for phase legs in some ports, while single bidirectional switches are used for the phase legs in other ports. This can be particularly advantageous where the converter interfaces between lines at significantly different operating voltages. By using B-TRANs as the series-combined elements of the combinations of switches, voltage-dividing circuitry is not needed to equalize the voltages seen by the individual devices in each combination.
Abstract:
The present disclosure generally relates to AC power control. More particularly, the present disclosure relates to a system and method for a Grid Tie Inverter (GTI) that provide for improved synchronization with the grid and better anti-islanding protection. In an aspect, the present disclosure provides for a system and method for improved synchronization of a GTI using a modulation method to turn OFF all switches near zero crossing that simplifies grid presence, voltage, frequency, phase detection and estimation, and also improves Phase Locked Loop (PLL) to synchronize the generated voltage with the grid. The system and method of the present disclosure also provides for a modulation method of using 3 switches out of 4 to avoid any reverse current from the grid to the GTI.
Abstract:
A dimmer is provided for controlling power to a load, the dimmer having a ground leakage power supply deriving power from a connection of the dimmer to ground. The power supply may be a switching-mode power supply that can be the sole or primary power supply to power operation of the dimmer, including operation of the controller.
Abstract:
A symmetry control circuit for a trailing edge phase control dimmer circuit for controlling alternating current (AC) power to a load, the symmetry control circuit including: a bias signal generator circuit configured to monitor non-conduction periods of each half cycle of said AC power for an elapsed duration of the non-conduction periods, and generate a bias signal voltage based on the elapsed duration, whereby an amplitude of the bias signal voltage is proportional to the elapsed duration of the non-conduction periods; and a bias signal converter circuit configured to convert the bias signal voltage to a bias signal current, wherein the bias signal current is added to a reference current of a conduction period timing circuit configured to determine said conduction periods, and wherein the conduction period timing circuit is configured to alter one of the conduction periods immediately following one of the non-conduction periods based on the bias signal current when added to the reference current to compensate for a phase shift of a zero-crossing of said one of the non-conduction periods corresponding to an elapsed duration of said one of the non-conduction periods so as to restore symmetry of the non-conduction periods of each half cycle of AC power.
Abstract:
A method for increasing the power extraction capability out of Differential Power Processor (DPP) system, which consists of a chain of N serially connected PV elements and an array of N-1 gyrator-type converters which are current sourcing resonant Switched Capacitor Converters (SCCs), each of which being connected in parallel with two adjacent PV elements. Accordingly, local MPPT is continuously performed, by each gyrator-type converter, to one of its two connected PV elements by sinking or sourcing current to/from the neighbouring PV element. Whenever a mismatch in the MPPs is detected, the gyrator-type converters are used to provide the difference in current that is required for each of the PV elements to operate at its MPP, such that the amount of power processed by each gyrator-type converter in the chain is linearly proportional to its location in the chain, with respect to the mismatched PV element.
Abstract:
An electronic component for providing optical isolation an electronic component package, a phototriac disposed within the electronic component package for providing the optical isolation, and a reverse zero-cross feedback channel integrated into the electronic component package to thereby provide zero-cross detection. The electronic component may be in a circuit which includes a phase control circuit. A method of driving an AC load and providing zero-cross detection using a single electronic component includes providing an electronic component having an electronic component package, a phototriac disposed within the electronic component package, and a reverse zero-cross feedback channel integrated into the electronic component package to thereby provide for zero-cross detection. The method further includes placing the electronic component within a circuit.
Abstract:
Triac control circuit with means (6) for sensing the gate voltage of a triac (2) and a gate pulse generator (11) responsive to the means for sensing. The gate voltage depends on the current through the triac and changes from a higher voltage value for a large triac current to a lower voltage value for a triac current closer to the triac holding current. By sensing the gate voltage it is possible to anticipate the triac turnoff and to generate a triac gate pulse before the triac turns off.