A six-level circuit topology for a power conversion system
A technology of circuit topology and power conversion, applied in high-efficiency power electronic conversion, conversion of AC power input to DC power output, electrical components, etc., can solve the problem of large switching loss, difficult to eliminate dead zone effect, complex mode switch state switching, etc. question
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Embodiment 1
[0092] Such as figure 1 As shown, the present invention is a six-level circuit topology for power conversion systems, including twelve switching devices A1-A12, five bus capacitors C 1 ~C 5 and three clamping capacitors C A1 ~C A3 .
[0093] The six-level circuit topology includes a first bus capacitor C 1 ~ Fifth bus capacitor C 5 The left path composed of serial connections in the same direction in turn,
[0094] The right path composed of the first switching device A1 to the sixth switching device A6 connected in series in sequence,
[0095] Middle Road 1 composed of the ninth switching device A9,
[0096] The second middle circuit composed of the seventh switching device A7 and the tenth switching device A10 connected in series,
[0097] The middle circuit three composed of the eighth switching device A8 and the eleventh switching device A11 connected in series,
[0098] A middle circuit four composed of the twelfth switching device A12.
[0099] In said right pa...
Embodiment 2
[0119] The present invention is a six-level circuit topology for power conversion systems, such as figure 2 As shown, it includes eighteen switching tubes S A1 ~S A6 , S A7 1 ~S A7 2 , S A8 1 ~S A8 2 , S A9 1 ~S A9 2 , S A10 1 ~S A10 2 , S A11 1 ~S A11 2 , S A12 1 ~S A12 2 , five bus capacitors C 1 ~C 5 and three clamping capacitors C A1 ~C A3 .
[0120] Among the eighteen switching tubes, four switching tubes are connected to form a first T-shaped unit, four switching tubes are connected to form a second T-shaped unit, and ten switching tubes are connected to form a π-shaped unit.
[0121] After the first to fifth bus capacitors are connected in series in the same direction, they are connected in parallel to the DC bus as a whole. There is a clamp capacitor between the T-shaped unit and the π-shaped structural unit, and the T-shaped unit and the π-shaped structural unit are connected in parallel on the DC bus as a whole.
[0122] The first swit...
Embodiment 3
[0143] according to figure 2 A single-phase six-level inverter with the topology shown, including five bus capacitors C 1 ~C 5 , eighteen switching tubes S A1 ~S A6 , S A7 1 ~S A72 , S A8 1 ~S A8 2 , S A9 1 ~S A9 2 , S A10 1 ~S A10 2 , S A11 1 ~S A11 2 , S A12 1 ~S A12 2 , three clamping capacitors C A1 、C A2 、C A3 .
[0144] Among them, the first to fifth bus capacitors C 1 ~C 5 are the five capacitors on the DC bus, which are respectively one-fifth of the bus voltage, and the switching tube S of the whole system A1 ~S A6 , S A7 1 ~S A7 2 , S A8 1 ~S A8 2 , S A9 1 ~S A9 2 , S A10 1 ~S A10 2 , S A11 1 ~S A11 2 , S A12 1 ~S A12 2 Both anti-parallel diodes.
[0145] 12 switching tubes S A7 1 ~S A7 2 , S A8 1 ~S A8 2 , S A9 1 ~S A9 2 , S A10 1 ~S A10 2 , S A11 1 ~S A11 2 , S A12 1 ~S A12 2 Six pairs of switching tube groups composed of two pairs. The turn-on and turn-off signals given by each switc...
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