| 摘要 |
The invention relates to a resonant converter (200, 300). The resonant converter (200, 300) consists of a furst circuit, primarily a DC circuit (201, 301) connected to a resonant circuit (207, 307) which is further connected to a switch/filter circuit (212, 312) which is connected to a second circuit, primarily an AC circuit (219, 319). The proposed resonant converter (200, 300) is unique in that the resonant converter (200, 300) contains a direct connection between a voltage centre (203, 303) in the DC circuit (201, 301) and a voltage centre (209, 309, 325) in the resonant circuit (207, 307), and that the resonant circuit (207, 307) contains at least one transformer having at least two windings (223, 224, 331, 332, 333, 334), wherein there is a connection from the windings (223, 224, 331, 332) of the transformer to at least first and second switches (215, 216, 315, 316, 328, 329), wherein activation of the switches (215, 216, 315, 316, 328, 329) forms a connection to at least a first node (214, 314, 327), wherein a voltage centre (203, 303) in the DC circuit (201, 301) is also connected to the first node (214, 314, 327) by activation of at least a third switch (213, 313, 326). This results in a resonant converter (200, 300) wherein there are just swiches (213, 215, 216, 313, 315, 316, 326, 328, 329) in the switch/filter circuit (212, 312) so that the number of switches (213, 215, 216, 313, 315, 316, 326, 328, 329) with power loss is as low as possible. The resonant converter (200, 300) moreover has the advantage that there is a direct connection from the centre (203, 303) of the DC circuit (201, 301) to the load (219, 319), without this current path running through the coil (217, 317, 330) to the resonant circuit (207, 307). This minimizes the current load of the coil (217, 317, 330) and hereby the influence on the frequency of the resonant converter in case of a short-circuit on the output of the resonant converter (200, 300) where a great output current is to be provided, while the output voltage is close to zero volt. The reason is that a switch (213, 313, 326) in the switch/filter circuit (212, 312), which is connected to a voltage centre (214, 314, 327), will conduct for by far the greatest part of the time at an output voltage close to zero volt, and that this current path bypasses the resonant circuit (207, 307). In addition, reduced switching across the switches (213, 215, 216, 313, 315, 316, 326, 328, 329) is achieved. |
