Comments on Technique to reset pulse transformer core quickly
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Technique to reset pulse transformer core quickly
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.
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Is there any way to reset a core quickly without having ground / reference terminal pulled towards negative voltage
Unfortunately not but, if instead of trying to send the complete pulse through the transformer, you send edge information (i.e. use a series capacitor to perform a kind of differentiation), then you can adequately reconstruct the secondary voltage using a comparator with hysteresis. Here's what the output waveform would look like: -
Below I've shown where you could set the upper and lower threshold limits for the comparator with hysteresis: -
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