Soft switching inverter device and method
AssigneeFuturewei Technologies, Inc.
InventorDianbo Fu
Life of this patent
Estimating the term…
Abstract
An inverter comprises a first switch coupled to an input of an output filter and a positive dc bus, a second switch coupled to the input of the output filter and a negative dc bus, a first freewheeling apparatus coupled to the first switch, the second switch and ground, a first soft switching network coupled to the first freewheeling apparatus and the first switch, wherein the first soft switching network is configured such that the first switch is of a first zero voltage transition during a turn-on process of the first switch and a second soft switching network coupled to the first freewheeling apparatus and the second switch, wherein the second soft switching network is configured such that the second switch is of a second zero voltage transition during a turn-on process of the second switch.
Claims10
An apparatus comprising:
- a soft switching network coupled to a power converter comprising a main switch, a freewheeling apparatus and an output filter formed by an inductor and a capacitor, wherein the freewheeling apparatus is connected between an input of the output filter and a common node of two input capacitors, and wherein the soft switching network comprises:
- a magnetic device, an auxiliary switch and a plurality of diodes, and wherein the soft switching network is configured such that:
- the main switch is of zero voltage switching;
- and
- the auxiliary switch is of zero current switching, wherein the auxiliary switch is configured to be turned on prior to a zero voltage transition of the main switch and be turned off after the zero voltage transition.
A method comprising:
- providing a soft switching network coupled to a main switch, a freewheeling apparatus and an output filter of a power converter, wherein the freewheeling apparatus is connected between an input of the output filter and a common node of two input capacitors, and wherein the soft switching network comprises:
- a magnetic device;
- an auxiliary switch connected in series with the magnetic device;
- and
- a plurality of diodes coupled to the magnetic device;
- prior to a zero voltage transition of the main switch, turning on the auxiliary switch;
- and after the zero voltage transition, turning off the auxiliary switch.
Dependencies are inferred from the claim text.