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US 2010/0142239 A1Published application
Fully integrated multi-phase grid-tie inverter
AssigneeNational Semiconductor Corporation
InventorPeter J. Hopper
Life of this patent
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Abstract
In a grid-tie inverter, the DC input is phase and pulse-width modulated to define multiple phase shifted voltage pulses with the width of each pulse being modulated according to the grid AC amplitude for the corresponding portion of the AC phase.
Claims11
A method of synchronizing a DC input signal to an AC signal, comprising
- phase-and-amplitude modulating the DC signal to define multiple phase-shifted high frequency signal pulses that each define a portion of an AC voltage envelope that has a frequency corresponding to the frequency of the AC signal, and combining the multiple high frequency signals to define an AC output signal.
A grid-tie inverter for synchronizing a DC input signal to a grid AC signal, comprising
- an array of switching transistors connected to the DC input, and
- a controller for controlling the control electrodes of the switching transistors to define voltage pulses that are phase shifted relative to each other the pulse-widths being modulated according to the grid AC signal amplitude.
Dependencies are inferred from the claim text.