Magnet coil cores, demagnetization power and Lenz delay.

[conradelektro]

Hi Jorge,

attached your circuit for 24 V operation.

But it is still very close for the A3144 Hall sensor, because it should not be operated above 24 V, but should support for some time 28 Volt. Do not run it for hours on 28 Volt, only some minutes. You could touch the A3144 to see if it gets hot. To 2 K resistor (1 K + 1 K) in front of the A3144 does not help much but should prevent the worst.

The Gate - Source Voltage of the IRF510 will not rise above 14 Volt at 28 V supply Voltage. The two 10 K resistors act as a Voltage divider.

Greetings, Conrad

[skycollection]

I have a correction.......the mosfet number is IRF 530....! but for the case i think is the same...!
jorge

[conradelektro]

I have a correction.......the mosfet number is IRF 530....! but for the case i think is the same...!
jorge

Maximum Gate Source Voltage of IRF530 is also 20 Volt, Conrad

http://pdf.datasheetcatalog.net/datasheets/400/283721_DS.pdf

[skycollection]

I have other question.....why you connect (in the battery charger) the negative pole to the positive line of current...? why not to the ground....?

[conradelektro]

I have other question.....why you connect (in the battery charger) the negative pole to the positive line of current...? why not to the ground....?

Because the battery is charged with the "Back Electromotive Force" Voltage (counter electromotive force). This current comes out of the coil in the reverse direction (of the drive current). For this charging current the positive rail is the ground. Or said differently, the Voltage after the charging diode is above the positive rail.

http://en.wikipedia.org/wiki/Counter-electromotive_force

I attach the Bedini standard circuit, where you can see the reverse connection of the battery to be charged. Your circuit is in essence the Bedini circuit (with a Hall sensor instead of the trigger coil).

Greetings, Conrad