BIPOLAR ALTERNATIVE TO H BRIDGE

[Altra]

Thanks for the sim. I'll study it!

[eclipse]

Pair this with the zero point active damping and you have very nice combo right there.

[Olly]

Thanks Mark ...

attached is the sim file to play with.

The TX frequency is 200 microseconds ( 5 Khz ) ... with 5 microsecond sampling at start and end of current pulse to measure "tilt or ramp error".

The target switches in and out at a 10 millisecond rate to test loop recovery.

With correct timing adjustment will support other TX frequencies.

moodz / Paul.

Looks very interesting so thought I'd have a play with the sim file you posted but LTSPICE can't seem to find the symbol for V10 & V11. (VOLTAGE_DC)
May be my copy of LTSPICE though as I've just updated it to 17.0.42 (mac) - what version are you using ?

Regards,
Olly

[Altra]

Looks very interesting so thought I'd have a play with the sim file you posted but LTSPICE can't seem to find the symbol for V10 & V11. (VOLTAGE_DC)
May be my copy of LTSPICE though as I've just updated it to 17.0.42 (mac) - what version are you using ?

Regards,
Olly

Hi Olly, I'm getting the same message. Probably the file got corrupted?

[moodz]

... Microsoft onedrive corrupts my shared libraries.. delete V10 and v11 and enter your own.. should work then.
should be called voltage not voltage_dc
moodz

[moodz]

... corrected sim file.

CCPI_REGULATED_V1 (2).zip

moodz

[Altra]

Working Thanks

[moodz]

Pair this with the zero point active damping and you have very nice combo right there.

Dont tell anyone

[Riss]

This bridge works fine, BUT! , M3 and M4 ( #1 ) must be replaced with p-channel mosfets to enable the bridge to operate at higher supply voltages. moodz to tell how to throw away (but not exactly like )M1 and M2, because I'm uncomfortable - after all, the idea and the thread are his property

[bishop_slayer]

I just came across this. Can anyone confirm that the main advantage of this circuit is that it has a higher efficiency than a standard pulse generator in a PI detector? Or are there additional advantages? What implications does the bipolar pulse have on the electronics in the amplification chain? Has anyone developed a proper amplification circuit for the Rx pulse for this yet?

[Carl-NC]

Yes, higher efficiency since it recycles flyback energy. Also faster as it requires no damping. Also bipolar which (a) eliminates the need for EFE samples and (b) improves EMI immunity. Also CCPI which allows for much faster pulse rates. This approach requires an IB coil which potentially makes the RX circuit a little easier. See the AMX project for an example design.

[JoyJo]

And is it possible to use the CCPI TX cascade to work with the receiving tract of the VLF? The TSCI is an alternative to the full H-bridge. The H-bridge works in VLF systems.

[moodz]

Short answer is yes.

[JoyJo]

Can it be used without a matching transformer: only the CCPI and the TX coil?

[moodz]

Can it be used without a matching transformer: only the CCPI and the TX coil?

Yes if you are prepared to use a balanced TX coil ( ie non grounded TX ... differential drive shielded pair )