Patent ID: 8405367

Claim:
A power conditioning unit with photovoltaic maximum power point tracking (MPPT), for delivering power from a photovoltaic dc power source to an ac mains power supply, the power conditioning unit comprising: an input for receiving power from said photovoltaic dc power source; an output for delivering ac power to said ac mains power supply; an energy storage capacitor for storing energy from said photovoltaic dc power source for delivering to said ac mains power supply output; a dc-to-ac converter coupled to said output for converting energy stored in said energy storage capacitor to ac power for said ac mains power supply output; and a power injection control block having a sense input coupled to said energy storage capacitor and having an output coupled to said dc-to-ac converter, to control said dc-to-ac converter to control power injected into said ac mains power supply; wherein said power injection control block is configured to track a maximum power point of said dc power source without measuring a dc voltage or dc current provided from said photovoltaic dc power source.