Building block for series connection in high power converter
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorHorst Gruening
Life of this patent
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Abstract
A converter has a plurality of building blocks, each block is a switching unit. Each building block must be able to receive high power at elevated switching frequency with low power dissipation in the semiconductor switches. The building block includes semiconductors switches and a reacter connected in series, and series connection of a voltage clamp and a diode. The series connection is connected in parallel to each of the semiconductor switches. The clamps are arranged in such a way, that all clamping and voltage control are realised by a clamp connected in parallel to the corresponding semiconductor switch.
Claims20
A building block for series connection in high power voltage source converters, comprising:
- a first semiconductor switch with anti-parallel diode,
- a reactor,
- a second semiconductor switch with anti-parallel diode, said first semiconductor switch, said reactor and said second semiconductor switch being connected in series,
- a first clamp having a voltage limiting function,
- a first reset diode, said first clamp and said first reset diode connected in series to define a first series circuit, said first series circuit connected in parallel to said first semiconductor switch,
- a second clamp having a voltage limiting function,
- a second reset diode, said second clamp and said second reset diode connected in series to define a second series circuit, said second series circuit connected in parallel to said second semiconductor switch, and
- an energy management element connected between said first and second clamps.
Dependencies are inferred from the claim text.