Commutation Cell, Power Converter and Compensation Circuit Having Dynamically Controlled Voltage Gains
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Abstract
The present disclosure relates to a commutation cell configured for limiting switching overvoltage. The commutation cell includes a power electronic switch having a parasitic emitter inductance through which a voltage is generated upon turning off of the power electronic switch. The commutation cell also includes a dynamically controlled compensation circuit connected to the parasitic emitter inductance. The compensation circuit applies a controllable portion of the voltage generated through the parasitic emitter inductance at turn-off of the power electronic switch to control the voltage generated through the parasitic emitter inductance. A power converter comprising a pair of commutation cells and a compensation circuit of the commutation cell are also disclosed.
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Citations
36 Claims
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1-18. -18. (canceled)
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19. A commutation cell configured for limiting switching overvoltage, comprising:
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a power electronic switch having a parasitic emitter inductance through which a voltage is generated upon turning off of the power electronic switch; and a dynamically controlled compensation circuit connected to the parasitic emitter inductance, the compensation circuit applying a controllable portion of the voltage generated through the parasitic emitter inductance at turn-off of the power electronic switch to control the voltage generated through the parasitic emitter inductance. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A power converter, comprising:
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a leg having two commutation cells, each of the two communication cells including a power electronic switch having a parasitic emitter inductance through which a voltage is generated upon turning off of the power electronic switch and a dynamically controlled compensation circuit connected to the parasitic emitter inductance, the compensation circuit applying a controllable portion of the voltage generated through the parasitic emitter inductance at turn-off of the power electronic switch to control the voltage generated through the parasitic emitter inductance, wherein the two commutation cells form a loop and are connected at a junction of a collector of a first power electronic switch of a first commutation cell and of an emitter of a second power electronic switch of a second commutation cell. - View Dependent Claims (30, 31)
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32. A compensation circuit for limiting switching overvoltage on a power electronic switch of a commutation cell, the commutation cell including a high frequency loop having a parasitic inductance through which a voltage is generated upon turning off of the power electronic switch, the high frequency loop parasitic inductance including a parasitic emitter inductance of the power electronic switch, the compensation circuit comprising:
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a dynamically controlled voltage divider configured to provide a controllable gain of a voltage generated on the parasitic emitter inductance at turn-off of the power electronic switch; and a connection from the voltage divider to apply to a gate driver of the power electronic switch a portion of the voltage generated through the parasitic emitter inductance according to the controllable gain to reduce the voltage generated on the parasitic inductance of the high frequency loop. - View Dependent Claims (33, 34, 35, 36)
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Specification