Why you should mount your SiC mosfets vertically - diyAudio
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Old 22nd July 2013, 05:56 PM   #1
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Default Why you should mount your SiC mosfets vertically

From a DOE 2013 CFP;

As new WBG high voltage semiconductors and transistor topologies are developed, identification of failure modes and the conditions that initiate them are becoming increasingly important to ensure reliable use for space based applications. Issues with performance degradation and failure of Si power devices attributable to cosmic radiation has been observed in the use of these device in both space and high altitude applications. Although fewer and lower energy cosmic rays reach the Earth’s surface, this phenomenon is an increasing concern for terrestrial applications of power devices. Studies have shown that cosmic-ray-induced effects can strongly influence the voltage derating necessary for the safe and long term use of Si MOSFETs and IGBTs, directly affecting their adoption and use in various applications.

Cosmic-ray-induced errors—mainly due to neutrons-
-will only worsen as circuit size continues to shrink. Proposals will need to establish and compare the influence of cosmic radiation on SiC MOSFETs and Si IGBTs under identical conditions in regards to cosmic radiation events. The effects will need to be analyzed to determine the long term reliability and performance of these technologies. Through these results, designers will be able to make better choices in the use of either Si or SiC for different applications. Additionally, semiconductor developers will be better equipped to develop design solutions once their reliabity has been established. Ultimately, the acceptance of WBG devices can result in dramatic energy savings across a broad spectrum of applications including switched-mode power supply, motor control, traction, solar and aerospace industries.


and further down:

Although initial work has demonstrated the ruggedness of SiC power MOSFETs, more in-depth fundamental experiments are needed [5-7]. The typical testing method, designed to quickly obtain information, is to irradiatedevices with high energy neutrons (50-80 MeV, ~104n/cm2). This method accelerates the failures to enable gathering the necessary data within weeks, but it is expensive and requires access to a high energy neutron beam facility. Another method (called the real-time terrestrial method) is easier to implement but requires a substantial number of devices (>100) for testing. The proposal for this subtopic should be to bias a large number of devices at high voltage and room temperature with a series resistance to limit the current and observe failures over a few months. The devices should be mounted flat to increase the flux of cosmic-rays impinging on the devices. The bias across the devices should be varied from 50- 100% of the rated voltage in stepped increments and readings should be taken at each bias point for an established period of time (e.g. 10 weeks). The goal of this subtopic will be to compare commercially available high voltage Si IGBTs and SiC MOSFETs devices to establish their resistance to radiation effects.
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Old 22nd July 2013, 06:46 PM   #2
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Yesss
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Old 22nd July 2013, 07:35 PM   #3
dsdjoy is offline dsdjoy  Germany
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Quote:
Originally Posted by permaneder View Post
Yesss
BTW: I also offer neutron resitance testing for Pass Labs amps......
Just ship your amp to me I'll make sure it is neutron resistant

(And in case it should not be neutron resistant, I optionally ship it at no additional charge to Official Pass Labs Disposal Facility / Zen Mod)

Last edited by dsdjoy; 22nd July 2013 at 07:42 PM.
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Old 22nd July 2013, 07:41 PM   #4
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Good to know...
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Old 22nd July 2013, 08:09 PM   #5
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Quote:
Originally Posted by dsdjoy View Post
BTW: I also offer neutron resitance testing for Pass Labs amps......
Just ship your amp to me I'll make sure it is neutron resistant

(And in case it should not be neutron resistant, I optionally ship it at no additional charge to Official Pass Labs Disposal Facility / Zen Mod)
Neutron resistance is futile.

jneutron
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Old 22nd July 2013, 08:27 PM   #6
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In the physical or interpersonal sense?
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Old 22nd July 2013, 08:43 PM   #7
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In the intergalactic and interpersonal sense..

ps..that worked well..can barely see it..

jn
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Last edited by jneutron; 22nd July 2013 at 08:48 PM.
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Old 22nd July 2013, 09:18 PM   #8
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Yet, I want my neutrons moderated for a sustained reaction.
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Old 22nd July 2013, 10:37 PM   #9
Zen Mod is offline Zen Mod  Serbia
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that's why OPLDF is situated where it is ;

because - on my latitude and longitude , all SITs ( and other 3-legged fuses) are vertical, ref. to origin of production

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Old 23rd July 2013, 12:27 AM   #10
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Originally Posted by vacuphile View Post
Yet, I want my neutrons moderated for a sustained reaction.
Almost everything taken in moderation is good..

There are of course, exceptions...we cannot go there..

jn
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