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[R-eng]

So here is the latest teaser.

This is an initial run of the HPMhb-150A with 12VDC batt input running a wiper motor. The thermal and current overload features are not yet active (they will require firmware for the ATtiny mcu), but the optocouplers to separate logic from power circuits are fully implemented. This test was a preliminary one where only 1 MOSFET per quadrant is used. The full compliment will be 4 per quadrant for a total of 16. Rated at 75A each, that would be a max continuous of 300A with proper heat sinking and fan (already fully designed). The heatsinks on this test are just basic ones. It is conservatively rated at 150A, and that is the limit of the current sensor used.

I just tested with dual-batteries at 24V, and the input can be up to 48V nominal, allowing for the slight over voltage of fully charged batteries.

You can see it in operation here...

http://s529.photobucket.com/albums/dd33 ... yrun02.flv

R-eng

The video shows the DSMhb-150A running with single 12V battery

[tronicgr]

Hi,

Nice to see it run so smoothly!!!! I think you can notice the difference in the status leds if you compare with the older DSMhb1.2b... The HIP chip really does what is designed to do!!!


R-eng, edit your video link above. I had to make it copy paste for the link to work.
http://s529.photobucket.com/albums/dd332/picvidme/avr-dsmhb%20sim/?action=view&current=HPMhb-150A2nddayrun02.flv


Regards, Thanos

[Raceray]

That was equally my first thought: I am really amazed that it runs so smooth in slow speeds

But i really love the design, it´s nice looking, compact, and also functional.

regards

[tpba]

I know some people have mentioned them around here before, but is this board much better than the OSMC board ? ( or are they completely different products )

thanks
T

[tronicgr]

I know some people have mentioned them around here before, but is this board much better than the OSMC board ? ( or are they completely different products )

thanks
T

Hi,

The OSMC motor controller is similar but it miss a lot of features that HPMhb-150A has...

Let me name few:

-Optocouplers to isolate completely the logic from the power part,
-Single PWM input (speed) with two digital direction controls, to be fully compatible with AMC motion controller, and ability to daisy-chain two HPMhb-150A boards through the same control cable.
-Watchdog microcontroller that monitors current and temperature level to automatically shut down the h-bridge in case of emergency, saving the mosfets.
-Possibility for I2C communication between AMC and the watchdog microcontroller to set the current and temperature level limits.

Thanos

[R-eng]

First off, let me give credit where credit is due.

The OSMC board design is the basis from which I began the design of the HPMhb-150A. That H-bridge is a tremendous development of simplicity and size to output capability. It has consistently proven itself in robotics.

But, after burning through numerous MOSFET trying to drive high powered motors with the excellent DSMhb, it became obvious that not only a more powerful H-bridge was needed, such as the OSMC project, but one that had generous and multiple protection features built in!

So began the HPMhb-150A and Thanos' generous help with the design mission. Thanos has just stated the main differences, but there are a few more such as...

-thermal and current overload components built in
-slightly larger size to allow for much larger heatsinking
-better connection facility using bolts/lugs for higher current capacity
-onboard main fuse protection
-additional 5V supply (besides 12V) dedicated to the power section
-much thorough power supply filtering for 5V, 12V, and Batt V inputs
-more flexibility using jumpers in how the power supplies are distributed
-very large planes for the power supplies and motor drive lines (no need for trace buildup with solder).
-included more TVS (Transient Surge Suppresion) components
-motor drive LEDs which can be remotely mounted to enclosure facia

I wish to thank all those who participated in the design of the OSMC, for without them, this project might not have developed quite so fast and efficiently (i.e. less mistakes).

But there is more work to be done to finish the project, with thorough testing before release.

R-eng

[wannabeaflyer]

Hi Guys iM at crucial Phase with My developments, i Noticed that you indicated that the new H-Bridge will be able to Communicate using I2C Can i ask and No Offence intended, its just that with my 2 DOF Motion Platform i Have a number of Options as to how to Drive the actuators and get Position Feedback data from sensors ..Some of you guys may know the work Done by Ian at buggiesBuilt4fun and as i have his software and some of the hardware i really dont want to duplicate Expensive Motor Controllers Ian Uses MDO3 controller made by Devantech which communicate via I2C but are only rated at 25Amps . so if i could use the new high Power H-Bridge as a Replacement for This Controller i would Be in a Great Position to have the flexibility to use various combinations for my Projects .. so Guys would it be possible to use the new H-Bridge with Ians Software for My Flight Sim Platform Had to ask guys dont shoot me down ..Money is tight and lots of projects started that i would like to finish and make avialavle here at last done enough lurking wanna get moving

[tronicgr]

I think I explained with the phrase: "Possibility for I2C communication between AMC and the watchdog microcontroller to set the current and temperature level limits."

It will save your time from removing the Attiny45 chip to reprogram it with other Temperature/Current limits...!!!! Its just a stand alone watchdog protection circuit!!!!!!!

Ian's software can talk through serial protocol to my AMC1.5 and then the AMC1.5 can move the HPMhb-150A as simple as that... The HPMhb-150A cannot be moved by the I2C signals that Ian's Picaxe hardware have...


The High Power H-Bridge is not just a Replacement for the Devantech MD03... Its a total different thing and can't be compared, in price and performance...



Regards, Thanos

[Mambo]

Nice work.
I want ask, why it could handle "only" 48 V ? Is it because type of transistors ? I ask because many servos (from old cnc) have higher voltage.

[R-eng]

The design criteria and the need to convert the voltage from the battery(ies) 12-60VDC to12VDC with a wide range and dependable DC-DC converter (so the HIP driver can be used), predicated the limitation to 48V nominal. The component selection fulfills the additional headroom needed to handle the slightly higher voltages present in freshly charged batteries when 4 are used in series, without bumping up to the ragged edge!

Seriously, how many need to have more than 48V nominal??? If that is the case, then you need to look into industrial solutions and their higher $$$.

And aren't "old CNC servos" industrial items?

P.S. another distinction from the OSMC is that it could only handle 50V max, limiting your batteries to a "safe" 36V nominal, based on the design/recommended BOM.

R-eng