Robust single-phase DC/AC inverter for highly varying DC voltages

摘要

A single-phase DC/AC inverter has a single-phase inverter bridge with binary switches connected to an RLC low-pass filter. Digital control logic in a control circuit (or in a microcontroller) determines and controls a logic state q determining the position of the switches in the inverter bridge from sensed iL, vC values from the RLC filter. The control logic selects one of multiple possible logic states q based on whether the sensed iL, vC values belongs one of multiple boundary regions of a tracking band in an iL, vC state space.

主权项

1. A single-phase DC/AC inverter comprising:
two DC input terminals; a single-phase inverter bridge having a set of four signal-controllable switches S1,S2,S3,S4 connected to the two DC terminals; a series RLC low-pass filter connected to the single-phase inverter bridge; two AC output terminals connected to the series RLC low-pass filter; and a controller circuit comprising: input lines for sensing current and voltage values from an inductor and capacitor of the RLC low-pass filter; output lines for sending a logic state control signal to the set of four signal-controllable switches S1,S2,S3S4; digital control logic that outputs by the output lines the logic state q in response to the sensed current and voltage values, where the control logic switches the logic state q by selecting one of multiple possible logic states based on whether the sensed current and voltage values intersect one of multiple boundary regions of a tracking band in an current-voltage state space.