Shorting coils circuits

this circuit uses driver and bi-directional mosfets to short coil at peak period
scope shot of oscillations created during sinewave peaks of AC signal from a single coil short event.
scope is set at 2 millseconds horizontal,  and 20V vertical
 
 
 
 

Comments

Doug Konzen - Oct 18, 2011 12:13 PM

The top circuit on paget shows howto short coils in for example a generator coil being induced by rotating magnets in rotor to make power.
this circuit uses "bidirectional" mosfets (two mosfets that attach at gate and source as shown and switching then occurs between the two drains)
the timing of the coil-short should occur at sinewave peak, and also the pulse widht should be not too wide, and not too narrow so is somthing that needs to be experimented with.
The circuit at bottom of page is one way to output the caps into load using "two stage" output circuit as youcannont have resistance on the caps as the fill-up from coil shorting technique - the caps need to be disconnected from coils when they hit a load....the AC seris cap is optional and will reduce the charge-rate of hte capacitors but works as high-bypass filter, to reduce lenz-lugging if it does occur...