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Comments on Technique to reset pulse transformer core quickly

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Technique to reset pulse transformer core quickly

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I am analysing a pulse transformer which is required to transfer below communication protocol pulse from primary to the secondary side. The pulse duration is 32 μs and off time available to reset the core is just 7 μs. Calculation shows that -22.85 V are required to reset the core within 7 μs.

For simulation, I have used 33 V Zener and 1N4148 blocking diode.

Is there any way to reset a core quickly without having ground / reference terminal pulled towards negative voltage ? because when -22.85 V is applied across TTL logic pins like microcontroller,they will get damaged.

communication pulse information

Ltspice simulation snapshot

Primary side Voltage waveform of transformer

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1 comment thread

A bipolar switch rated for high Vceo seems to be all you need to protect the driver. Either high sid... (1 comment)
A bipolar switch rated for high Vceo seems to be all you need to protect the driver. Either high sid...
TonyStewart‭ wrote over 1 year ago · edited over 1 year ago

A bipolar switch rated for high Vceo seems to be all you need to protect the driver. Either high side PNP or low side NPN. >100V is easy to find. Your 1st plot is not to scale.