Flying capacitor circuit, circuit module and power conversion apparatus
AssigneeFuji Electric Co., Ltd.
InventorsSatoru Fujita, Yuto Matsui, Yusuke Onishi
Life of this patent
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Abstract
If current path is switched via switching, voltage overshoot exceeding the device breakdown voltage may be generated. A flying capacitor circuit is provided, having a plurality of switching devices cascade-connected on a first surface of a substrate; a plurality of rectifier devices cascade-connected on a second surface of the substrate; and at least one capacitor provided in a wiring connecting main terminals of a switching device and a rectifier device that are associated with each other and included in the plurality of switching devices and the plurality of rectifier devices; and at least part of the wiring runs sandwiching the substrate in parallel.
Claims23
A flying capacitor circuit comprising:
- a plurality of switching devices cascade-connected on a first surface of a substrate;
- a plurality of rectifier devices cascade-connected on a second surface of the substrate;
- at least one capacitor provided in a wiring connecting main terminals of a switching device and a rectifier device that are associated with each other and included in the plurality of switching devices and the plurality of rectifier devices, wherein the number of capacitors provided between main terminals of a switching device and a rectifier device of one set associated with each other is different from the number of capacitors provided between main terminals of a switching device and a rectifier device of another set, the switching device and the rectifier device of the one set and the switching device and the rectifier device of the other set being included in the plurality of switching devices and the plurality of rectifier devices;
- and
- at least part of a wiring run sandwiching the substrate in parallel.
A circuit module comprising:
- a switching device mounted on a first surface of a substrate;
- a rectifier device mounted on a second surface of the substrate;
- and
- at least one capacitor provided in a wiring for connecting a main terminal of the switching device and a main terminal of the rectifier device, wherein the number of capacitors provided between main terminals of a switching device and a rectifier device of one set associated with each other is different from the number of capacitors provided between main terminals of a switching device and a rectifier device of another set, the switching device and the rectifier device of the one set and the switching device and the rectifier device of the other set being included in the plurality of switching devices and the plurality of rectifier devices;
- and
- at least part of a wiring run sandwiching the substrate in parallel.
A circuit module comprising:
- a single flying capacitor circuit comprising:
- a switching device;
- a first capacitor and a second capacitor connected in series;
- and
- a rectifier device, wherein
- the switching device is mounted on a first surface of a substrate;
- the first capacitor is mounted on the first surface of the substrate, electrically connected to the switching device;
- the rectifier device is mounted on a second surface of the substrate;
- the second capacitor is mounted on the second surface of the substrate, electrically connected to the rectifier device;
- and
- a plurality of vias electrically connect the first capacitor in series to the second capacitor, the plurality of vias passing through the substrate.
Dependencies are inferred from the claim text.