IP Library › Granted Patent US 12,609,604
Granted Patent B2
US 12,609,604 · App. 18/377,757 · Granted Apr 21, 2026

Single-phase voltage source inverter circuit with power filter reduction

Inventors: Guanghong Song (Nanchang, CN); Bo Cao (Fredericton, CA); Hassan A. Hassan (Fredericton, CA); Liuchen Chang (Fredericton, CA)
H02M1/126H02M7/537H02M7/5387
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Quick Facts
Patent No.
US 12,609,604
App. No.
18/377,757
Granted
Apr 21, 2026
Kind
B2
Abstract

A single-phase voltage source inverter and method including a main inverter circuit connected to an active power filter circuit, the main inverter circuit comprising an H-bridge circuit comprising a first leg and a second leg, the first leg comprising a first switch, a second switch, and the second leg comprising a third switch and a fourth switch, the active power filter circuit comprising a third leg comprising a fifth switch and a sixth switch, the main inverter circuit connected to a secondary side of a high frequency transformer and a grid filter in series, and adapted to be connected to an AC load, a primary of the high frequency transformer and a capacitor connected in series to the active power filter leg and an H-bridge leg.

Claims (13)

1 . A single-phase voltage source inverter comprising:

a main inverter circuit connected to an active power filter circuit;

the main inverter circuit comprising an H-bridge circuit comprising a first leg and a second leg, the first leg comprising a first switch, a second switch, and the second leg comprising a third switch and a fourth switch;

the active power filter circuit comprising a third leg comprising a fifth switch and a sixth switch;

the main inverter circuit connected to a secondary side of a high frequency transformer and a grid filter in series, and adapted to be connected to an AC load;

a primary of the high frequency transformer and a capacitor connected in series to the active power filter leg and an H-bridge leg.

2 . A method of power filter reduction using the inverter of claim 1 , comprising:

charging and discharging the high frequency transformer primary and the capacitor by controlling the switches of the active power filter circuit to generate an induced voltage on the transformer secondary which is in opposite phase with the pulses generated by the switches of the main inverter circuit.

3 . The method of power filter reduction of claim 2 , wherein charging and discharging the active power filter circuit comprise the steps of

the first, fourth and fifth switches turned on and the second, third and sixth switches turned off; followed by

the first, third and fifth switches turned on and the second, fourth and sixth switch turned on, followed by

the first, fourth and fifth switches turned on and the second, third and sixth switches turned off, followed by

the first, third and fifth switches turned off and the second, fourth and sixth switched turned on.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 13, 2025
From: SONG, GUANGHONG; CAO, BO; HASSAN, HASSAN ATHAB; CHANG, LIUCHEN
To: THE UNIVERSITY OF NEW BRUNSWICK
Reel/Frame 072894/0066 →
Continuity (1)
Related Publication 20250119051A1 · Apr 10, 2025
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