2019-07-23, 03:01 AM
(This post was last modified: 2019-07-23, 03:03 AM by seandepagnier.)
(2019-07-23, 12:48 AM)partyvi Wrote: About what heat we are talking?
On 10A (full 100% cycle) on 150mOhm MOSFETs it will be (0.150+0.150)*10 = 3W on mine and 0.2W on yours - yes difference in 15 times, but 3W is in absolute maximum mode for the design and 3W is not a huge heat.
The power dissipated is I^2 * R
So for 10 amps this is:
10*10*.150 which is 15 watts. This tiny part on the pcb cannot dissipate easily 15 watts.
For my controller:
10*10*.010 = 1 watt. This is distributed across parts which can dissipate more than this without a heat sink.
The fuse, pcb traces and other components dissipate slightly more than the mosfets do as well.
Quote:It was easier for me to build my own, electronics design and programming is what I like to do. Ant I just share to community.
My bridge is 10A max, but for most linear actuators or ever direct drive even it is overkill.
See above. It might support 10 amps stall current since it doesn't have much duration and overcurrent or over temp sensor will save the controller. But it cannot handle a motor that draws 10 amps running (and stalls at 30) like a hydraulic pump.
Quote:My average pilot consumption is below 1 amp. means less than 300mW heating in bridge which is almost nothing to talk about.Yes. For smaller tiller pilots your bridge is perfectly good and it's not an issue for motors that use just a few amps. Also I think you improved a few things and I enjoy this.I never see its temperature grow more than 2-3C under any conditions.