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Old 13th November 2012, 10:36 PM   #121
AP2 is offline AP2  Italy
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Originally Posted by hochopeper View Post
Thanks for the insight Roberto, I wasn't sure how different the shutdown method/sequence from remote vs isolated fast break would be. Your suggestion of just using the remote is really easy to implement with an AND gate between current logic and the isolated relay.

Getting close to having a schematic finished up in the next day or so, attached a block diagram of what I am hoping to end up with ...

Regards,
Chris
woW! this is the passion...
you have a dsp also in this board?
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Old 13th November 2012, 11:57 PM   #122
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Thanks!

No DSP at all, cmos logic chips, flipflops, comparators and a few opto-isolated relays get everything done.

Of course I could have done it with an arduino or similar too. I started out thinking I'd control everything with the xbee providing the IO and the logic/processing done remotely but I decided that it was too inefficient and placed too much reliance on wireless comms working flawlessly and quickly.

Most of the cost in the parts is in the relays the rest are cheap and I'd need the relays and PCB regardless of whether it is software or hardware implementing the control.

I wanted something that would let us get the most from the power supplies and amps ... then after a while I got a bit carried away with bells and whistles

Last edited by hochopeper; 14th November 2012 at 12:01 AM.
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Old 14th November 2012, 06:40 PM   #123
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its cool to now have it be more independent, but as is, can you remind me why the Xbee is there? hehe the concern I have with this approach is its not easily added to, we end up with an XBEE connected to an MCU acting basically as a dumb switch and with little ability to expand/change capability like with software, or have much by way of feedback without doing a new PCB. like Xbee doesnt seem to even know what temp it is?

i'll shoot you an email later, now is the first i've checked the flowchart properly in a while

going by the flowchart theres no connection from the heat sensor logic to Xbee, but pin 11 is ADC? what kind of feedback is given here? is the 30c just a decision point or is it a constantly changing/sliding scale that could actually feed all temps rather than just deciding 30c yay/nay?

Last edited by qusp; 14th November 2012 at 06:53 PM.
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Old 14th November 2012, 10:34 PM   #124
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Emailed you

For the thread the headlines are:

- Local control is better, remote over-rides are possible via xbee, if desired.
- xbee stuff will allow additional remote identification (and recording) of each DPS600's enable and it's corresponding amplifier overtemp status (also LED controller on pcb for local identification while amp enclosure is open)


At the moment I've designed the temp sensors to feed comparators that have the following thresholds:

Winter -> Summer trigger point @ 33degC
Summer -> Winter trigger point @ 27degC

OK -> overtemp @ 80degC
overtemp -> OK @ 68degC


The thresholds are adjustable via 3 feedback resistors on the comparators. The hysteresis stops it from bouncing as the temperature sensor reaches the decision point. The above seemed pretty safe settings given my heatsinks and intended bias settings.
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Old 14th November 2012, 10:51 PM   #125
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Hi, in this all..dps-600 break at >82 in side of Power-Unit. just a info
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Old 15th November 2012, 12:09 PM   #126
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I dont think you should discount the interest that there may be in our solution once its more fully described, XBee presents a great remote state feedback and control mechanism for amplifier/dac clusters. I think many people will actually find this useful once they see how its done. but guys do keep in mind hochopeper and I are pretty single-minded about our objectives here, it will never be a design by concensus

control may be from PC/Mac over wifi, ethernet, internet, iphone/android, as well as hardwired logic state failsafes
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Old 15th November 2012, 12:34 PM   #127
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Originally Posted by qusp View Post
I dont think you should discount the interest that there may be in our solution once its more fully described, XBee presents a great remote state feedback and control mechanism for amplifier/dac clusters. I think many people will actually find this useful once they see how its done. but guys do keep in mind hochopeper and I are pretty single-minded about our objectives here, it will never be a design by concensus

control may be from PC/Mac over wifi, ethernet, internet, iphone/android, as well as hardwired logic state failsafes
I find it interesting, the work you are doing. maybe this piece of software / logic control, is not in the right thread.
Personally I did not show the enthusiasm, only to lack of time. Unfortunately, I follow some work in parallel, of a different nature at the same time, every time, I look at this forum while I work. haha .. reason why my brain fires nonsense ... sometimes.
I develop (use c / c + + or FreeBASIC) some drivers or software or control panel, filter etc, for Windows and Mac,incluse firmware for cpu/dsp.
if I can give a little help, I'm available.
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Old 15th November 2012, 01:39 PM   #128
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Hi Roberto,

Sorry for the recent off topic posts. I'm mostly asking in here because the main objective from this project is to get DPS600 and LME49830 wire amps integrated and optimised. Eventually I expect I'll start a thread about this in completeness, but only once I have something to show ...


You think you struggle changing modes between work and these side projects, I change between M.VA power systems (mostly 11kV) work and this uA or mA level stuff for a hobby ... also using databases (sql) or python or vba for work when necessary too

Chris
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Old 15th November 2012, 09:47 PM   #129
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Quote:
Originally Posted by AP2 View Post
I find it interesting, the work you are doing. maybe this piece of software / logic control, is not in the right thread.
Personally I did not show the enthusiasm, only to lack of time. Unfortunately, I follow some work in parallel, of a different nature at the same time, every time, I look at this forum while I work. haha .. reason why my brain fires nonsense ... sometimes.
I develop (use c / c + + or FreeBASIC) some drivers or software or control panel, filter etc, for Windows and Mac,incluse firmware for cpu/dsp.
if I can give a little help, I'm available.
thanks mate, no youve been of great help already! I didnt mean you, I was just replying to hochopeper who had left xbee less than fully described in the flowchart, because he didnt think it would be of much interest to people, or maybe he just thought it was easier since we already know pretty much what we want it to do, but we havent made it do it yet =) I think its one of the more interesting parts

I dont think its off topic, as a whole maybe, but the application is very specific to this amp using DPS600 and its power sequencing, temp sensing and remote control, the systems are all linked to control multiple amps as one, we have not even mentioned the dac and digital crossover branch yet and wont because that really is OT.

We are not the only ones also using LPUHP amps in the same case as the wire and dps600, so to deem that off topic I think is a little limiting and difficult to avoid some talk of it. we will try not to venture too far off track of dps600 application, thanks again for your offer of help, even if its just checking over our work with another perspective it will be much appreciated.

Last edited by qusp; 15th November 2012 at 09:49 PM.
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Old 15th November 2012, 10:33 PM   #130
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Obvius is not OT, it's good we change ideas or solution, even around the dps-600
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