H Bridge Driver for Single Coil, How to add protection?
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From: Myauk on 26 Feb 2010 03:01 Dear All, I am designing H-Bridge Relay Circuit. The coil resistance is 36 ohms. Inductance is 500mH measured at 100Hz, 1V pk to pk with Agilent LCR Meter. Do I need additional snubber or TVS to protect the switches? If so how to add the protection? Regards
From: Joe G (Home) on 26 Feb 2010 08:52 "Myauk" <aungkokothet(a)gmail.com> wrote in message news:fee56510-be38-447f-a3da-8216b9a4703c(a)k18g2000prf.googlegroups.com... > Dear All, > > I am designing H-Bridge Relay Circuit. > > The coil resistance is 36 ohms. Inductance is 500mH measured at 100Hz, > 1V pk to pk with Agilent LCR Meter. > > Do I need additional snubber or TVS to protect the switches? If so how > to add the protection? > > Regards Max current thru coil i = V / R = V/36 Joe
From: Jamie on 26 Feb 2010 18:20
Myauk wrote: > Dear All, > > I am designing H-Bridge Relay Circuit. > > The coil resistance is 36 ohms. Inductance is 500mH measured at 100Hz, > 1V pk to pk with Agilent LCR Meter. > > Do I need additional snubber or TVS to protect the switches? If so how > to add the protection? > > Regards Just a diode across the coil should surfice You could also use a Bi-directional TVS diode, those work very nicely.. |