Robust single-phase DC/AC inverter for highly varying DC voltages
First Claim
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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 switch one (S1), switch two (S2), switch three (S3), and switch four (S4)connected to the two DC input terminals, wherein a switching state of the four signal-controllable switches is referred to as a logic state (q);
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 switch one (S1), switch two (S2), switch three (S3), and switch four (S4);
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 a current-voltage state space.
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Abstract
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.
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Citations
4 Claims
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1. A single-phase DC/AC inverter comprising:
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two DC input terminals; a single-phase inverter bridge having a set of four signal-controllable switches switch one (S1), switch two (S2), switch three (S3), and switch four (S4)connected to the two DC input terminals, wherein a switching state of the four signal-controllable switches is referred to as a logic state (q); 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 switch one (S1), switch two (S2), switch three (S3), and switch four (S4); 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 a current-voltage state space. - View Dependent Claims (2, 3, 4)
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Specification