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Registered Member #1153
Joined: Mon Dec 03 2007, 07:27PM
Location: Croatia
Posts: 213
I decided to spend this afternoon and play with my DRSSTC. However my DRSSTC blows the 35 A 1000 V bridge rectifier every few minutes. I already killed my last three. What could be the problem ? Run times were short, current limiter set to low 300 A and even input current to bus cap was limited by resistor. Can it be possible i have faked bridge rectifiers (common case here with electronic components) ?.
Here is how they fail, the DC terminals do not short and still forward as they should from AC terminals. However the AC terminals short with some resistance
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
The IGBTs survive?
Do you have the rectifier heatsinked?
Maybe there is some serious common mode voltage between the diodes and the case? Try a .1uF cap from bridge negative output to the heatsink/case and ground the heatsink/case.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
KresoLiubov wrote ...
I decided to spend this afternoon and play with my DRSSTC. However my DRSSTC blows the 35 A 1000 V bridge rectifier every few minutes. I already killed my last three. What could be the problem ? Run times were short, current limiter set to low 300 A and even input current to bus cap was limited by resistor. Can it be possible i have faked bridge rectifiers (common case here with electronic components) ?.
Here is how they fail, the DC terminals do not short and still forward as they should from AC terminals. However the AC terminals short with some resistance
The number one problem when people have bridge rectifiers that fail is improper hook-up and grounding. Either the neutral is improperly connected, or earth ground is somewhere tied on the output of the bridge rectifier which results in a short and BOOM.
Also, if you already blew (3) and the component is properly rated for the system its being used for, the problem lies elsewhere. The blown rectifier is just a symptom of a problem downstream.
Registered Member #1153
Joined: Mon Dec 03 2007, 07:27PM
Location: Croatia
Posts: 213
Steve Ward wrote ...
The IGBTs survive?
Do you have the rectifier heatsinked?
Maybe there is some serious common mode voltage between the diodes and the case? Try a .1uF cap from bridge negative output to the heatsink/case and ground the heatsink/case.
Yes the IGBT-s work wonderfully and do not fail! The rectifier was properly heatsinked and heatsink was gounded since the case of the rectifier is not connected to anything.
I later found a bridge rectifier from my SSTC in past its 400 V 15 A (its old desoldered from some rack). I decided to try it out, and didnot get even 1 failure whole last night with excesive runtimes at maximal current and power.. Im sure the rectifiers i bought were fake!
Here is rectifier i have and they fail almost instantly:
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DRSSTC and flying silicon
