I need to control speed and direction of a 12 volt motor. I have done quite a bit of work with various solid state h bridges all of which have their problems, shoot through, voltage drop etc.
The simplest and most robust soloution Ive found is a relay for direction controll and a mosfet under pwm for speed controll.
This idea was confirmed in my mind when I saw in the mouser catalogue this relay
http://www.worldproducts.com/pdfs/ep2.pdf
which is made for automotive use for controll of electric seats, power windows and so on. I figure if car makers use this soloution thats good enough for me.
I got a few in from mouser but Im having trouble understanding the schematic/pinout of the H bridge type relay on page 2 which is the type I have. In cases like these the data sheet writers figure they're writting for professional engineers and so dont give all that much detail.
I can see that pins 2 and 3 and 6 and 7 are for power to the coil but I can't undertand the other pins.
Can anyone interpet the diagram and tell me which pin is which?
 
Edited by - BrendanP on 11/08/2007 14:08:16
The simplest and most robust soloution Ive found is a relay for direction controll and a mosfet under pwm for speed controll.
This idea was confirmed in my mind when I saw in the mouser catalogue this relay
http://www.worldproducts.com/pdfs/ep2.pdf
which is made for automotive use for controll of electric seats, power windows and so on. I figure if car makers use this soloution thats good enough for me.
I got a few in from mouser but Im having trouble understanding the schematic/pinout of the H bridge type relay on page 2 which is the type I have. In cases like these the data sheet writers figure they're writting for professional engineers and so dont give all that much detail.
I can see that pins 2 and 3 and 6 and 7 are for power to the coil but I can't undertand the other pins.
Can anyone interpet the diagram and tell me which pin is which?
 
Edited by - BrendanP on 11/08/2007 14:08:16