External Rectifier Diodes for Drive Inverter

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User19621
Level 1
Level 1
Hello,

I'm considering using multiple IRSM005-301MH integrated half-bridges in an inverter for motor control applications. When there are voltage spikes due to motor inductance, I am concerned about the reverse recovery time of the body diodes causing shoot-through. For this reason, I am considering using external rectifier diodes across each half bridge.

The IPM selector guide claims that the CIPOS Nano line uses "motor drive-optimized fast recovery FETs." I have two questions:

1. For these fast recovery FETs, are external rectifier diodes necessary for motor drive applications?
2. Does anybody know what the reverse recovery time of the body diode is?

Thanks.
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1 Solution
Casey
Employee
Employee
50 replies posted 25 replies posted 10 replies posted
w00t wrote:
Hello,

I'm considering using multiple IRSM005-301MH integrated half-bridges in an inverter for motor control applications. When there are voltage spikes due to motor inductance, I am concerned about the reverse recovery time of the body diodes causing shoot-through. For this reason, I am considering using external rectifier diodes across each half bridge.

The IPM selector guide claims that the CIPOS Nano line uses "motor drive-optimized fast recovery FETs." I have two questions:

1. For these fast recovery FETs, are external rectifier diodes necessary for motor drive applications?
2. Does anybody know what the reverse recovery time of the body diode is?

Thanks.


Hello,
No need for external rectifier diodes. And please see attached for some measurements for Trr (reverse recovery time) for IRSM005-301MH. The measurements were taken at two temperature points and various di/dt @10A.
4356.attach

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1 Reply
Casey
Employee
Employee
50 replies posted 25 replies posted 10 replies posted
w00t wrote:
Hello,

I'm considering using multiple IRSM005-301MH integrated half-bridges in an inverter for motor control applications. When there are voltage spikes due to motor inductance, I am concerned about the reverse recovery time of the body diodes causing shoot-through. For this reason, I am considering using external rectifier diodes across each half bridge.

The IPM selector guide claims that the CIPOS Nano line uses "motor drive-optimized fast recovery FETs." I have two questions:

1. For these fast recovery FETs, are external rectifier diodes necessary for motor drive applications?
2. Does anybody know what the reverse recovery time of the body diode is?

Thanks.


Hello,
No need for external rectifier diodes. And please see attached for some measurements for Trr (reverse recovery time) for IRSM005-301MH. The measurements were taken at two temperature points and various di/dt @10A.
4356.attach
0 Likes