Abstract: Driver circuits for light-emitting devices (e.g., light-emitting diodes), as well as systems and methods associated therewith are provided.

Abstract: A device for collection of energy from mechanical disturbances and distribution of that energy to an electrical load. A transducer converts mechanical energy in the form of forces and displacements into electrical energy in the form of charge pulses. The charge pulses are rectified into a Direct Current (DC) power signal and accumulated and stored in an input storage element. A controlled conversion circuit assures that the voltage on the storage element is maintained within a predetermined optimal range for energy harvesting from the transducer, avoiding the application of peak voltages. The controlled conversion circuit can be hard wired and/or controllably adjustable to match a given disturbance characteristic. Only when the voltage is within the optimal range for a given type of disturbance will the controlled conversion circuit enable a DC/DC converter to further convert the stored energy to a voltage that is coupled to an output storage element.

Abstract: Power from a DC power source, such as a 12 volt RV or boat battery, is boosted and converted to provide an AC signal suitable for operating an induction motor such as a refrigerator compressor motor. The converter provides voltage pulses having a substantially constant width. The converted voltage signal frequency is initiated at a low frequency and ramps up to 60 Hz. A start winding control circuit is provided for activating the start winding for a limited initial period. A thermostat for controlling the activation of the compressor motor is connected in series with the motor load such that shutting off the compressor disconnects the motor from the circuit. Control circuitry monitors under voltage, over voltage, overcurrent, AC switching, and adequate delay before restart and controls the circuitry accordingly.