Excessive Heating in ETD49 3C90 Core Pulse Transformer Primary Winding at 50kHz: Solutions

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#31 16187299 09 Jan 2017 22:48

_lazor_ _lazor_

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Post #31
16187299 09 Jan 2017 22:48

You can always raise the voltage to these 600-700 and then control the transistors. It is known that such a power supply would require a large number of taps on the transformer, but it is doable.

As for 10kV and insulation testing, probably such a system did not consume too much energy Because there is a difference between 10kV and 10mA and 100mA
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#32 18044013 04 Jul 2019 14:37

kit34 kit34

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Post #32
18044013 04 Jul 2019 14:37

Hello,

To avoid starting a new topic, I'll ask here.
Is it possible that the primary winding of the transformer in the garage door drive burnt out from an overvoltage?
I would like to add that the garage TV, drive gates and intercom were connected to the same circuit. All devices are still ok.
The reason for my inquiry is the universal answer from the service that the reason for the fault is overvoltage and it is not covered by the warranty. Unfortunately, the serviceman, when asked what had broken down, first reacted by looking at the sky, and then he kept talking about everything, and finally, in a confident voice, he said that the winding had burnt out from the overvoltage.

sincerely thank you for your help
#33 18045361 05 Jul 2019 09:59

brofran brofran

Level 41

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Post #33
18045361 05 Jul 2019 09:59

kit34 wrote:
Is it possible that the primary winding of the transformer in the garage door drive burnt out from an overvoltage?
Most likely, although in this particular case it is doubtful. Unfortunately, the service will not consider circumstances in which the damage occurred, because he is unable to determine whether the client is telling the truth.
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Topic summary

The discussion revolves around excessive heating in the primary winding of a pulse transformer using an ETD49 3C90 core in a half-bridge converter operating at 50kHz. The user reports temperatures exceeding 140°C after 10 minutes of operation. Various contributors suggest potential solutions, including reducing the number of turns on the primary winding, introducing a gap in the core, and optimizing the choke placement. The user confirms that the primary winding heats more rapidly than the secondary and discusses the impact of a voltage doubler on the system's performance. The conversation also touches on the importance of current waveforms, core saturation, and the implications of using a resonant converter. Ultimately, the user plans to test configurations with different core sizes and winding arrangements to mitigate heating issues.
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