Commutation cell, power converter and compensation circuit having dynamically controlled voltage gains
First Claim
1. A commutation cell configured for limiting switching overvoltage, comprising:
- 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;
the compensation circuit being dynamically controlled to change the controllable portion of the voltage generated through the parasitic emitter inductance based on a voltage of a power source which is configured to power the commutation cell.
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Accused Products
Abstract
A commutation cell is 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 includes a pair of commutation cells and a compensation circuit of the commutation cell.
29 Citations
17 Claims
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1. 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;
the compensation circuit being dynamically controlled to change the controllable portion of the voltage generated through the parasitic emitter inductance based on a voltage of a power source which is configured to power the commutation cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A power converter, comprising:
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a leg having two commutation cells, each of the two commutation 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, each of the compensation circuits applying a respective controllable portion of the voltage generated through the respective parasitic emitter inductance at turn-off of the respective power electronic switch to control the voltage generated through the respective parasitic emitter inductance;
each of the compensation circuits being dynamically controlled to change the respective controllable portion of the voltage generated through the respective parasitic emitter inductance based on a voltage of a power source which is configured to power each of the two commutation cells,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 (12)
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13. 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 through 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 controllable portion of the voltage generated through the parasitic emitter inductance according to the controllable gain to reduce the voltage generated through the parasitic inductance of the high frequency loop, wherein the voltage divider is dynamically controlled to change the controllable portion of the voltage generated through the parasitic emitter inductance based on a voltage of a power source which is configured to power the commutation cell. - View Dependent Claims (14, 15, 16, 17)
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Specification