Published:2011/4/7 20:34:00 Author:may | Keyword: zero-voltage zero-current switch, three-level DC converter | From:SeekIC
In order to remove circulating current of zero-voltage switch three-level DC converter in zero state, we come up with kind of zero-voltage zero-current switch three-level DC converter circuit. The circuit is shown in the following diagram
1, the main difference between this circuit and zero-voltage switch three-level DC converter is: add coupling capacitance C55 and add pilot switch SAUX and clamp capacitance CAUX in transformer secondary winding; coupling capacitance C55 separately connect the switch process of outer outer-side tube VT1, VT4 and in side tube VT2, VT3.
2, this circuit adopts blocking capacitor as blocking voltage source, let transformer once side current decrease to zero in zero state, thereby achieve zero current switch of in side switch tube.
3, This diagram separately series diode VT2 and VT3 in branch circuit of VT2 and VT3 in order to prevent the transformer once side current to continue flow in negative direction in zero state. It removes the minus effect after adding saturated inductance.
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