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With this solution you can fast open low z injectors and fast close(30V flyback) but with 25% pwm(low energy losses on flyback transistor). Hold time is 1ms. Schematic: http://carphotos.cardomain.com/ride_images/1/2822/1741/7053370240_large.jpg * we are thinking to use '''MTD20P06LG (ONS) RoHS P-POWERFET 60V 20A DPAK''' - any objections ? * diode : I use by500-1000 (cheap, fast) ** I put zener diode on vems board 30V transient protection diode (1k5E30 diode from WebShop) ** so when pwm is activated, current flow through active flyback, but when injector needs to close, 30V high voltage flyback inside VEMS does the clamping Same schematic, but drawn in a slightly confusing way: http://img359.imageshack.us/img359/5412/flybackln2.jpg When pwm last, flyback voltage is 0.3-1.5V(depending of schottky diode and mosfet(irf9540)) http://img516.imageshack.us/img516/5109/voltagevs1.jpg Bad thing is, you must have one of thise flyback for every injector. PCB http://hosting01.imagecross.com/image-hosting-07/49841.jpg Assembled board(missing 2 zener diodes, i bought two too few) http://hosting01.imagecross.com/image-hosting-07/4062.jpg That board was tested on lpg injectors(landi renzo, 0.9ohm) and working well.
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