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Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
Since i sold some musical drsstcs for theatre and educational use, i wanted to make them easier to control and adjust and they should survive long time runs without damage.
this new driver is not only a drsstc driver,, its way more than that. when its finished the driver consists of 3 seperate 19inch cassette modules with 64 pin connectors to form a bus system. the first module is nearly finished.
on board are:
two temparature circuits made out of lm393 comparators. they both use lm35cz temparature sensors to measure the temperature of the bridge and the mmc. 45°C turns a relais on, build on the powersupply module, to use as a 230v fan switch, so 45°C turns on the fans in the circuit. if the temperature goes higher, 65°C turns on a error pin, connected to an atmega 8 (16) microporcessor, build on the thrid module. so the software can control what to do.
but thats not all. I have the new predikter version on board, slightly changed to get rid of this symmetrical powersupply. then a precision operational amplifier rectifier for the overcurrent protection(+-10mV accuracy over a frequency range from 30 to 500khz). All signal pins are connected to the 64pin bus system to allow the connection to the other modules and for future use with even more modules. so i can for example remove a jumper on the driver board, that allows me to set the reference voltage for the ocd trigger with the microcontroller. or i can use the pin of a temperature sensor to measure the exact temparature of the bridge via the microcontroller... or i can feed the signal of the precision rectifier to the controller and program a real time current display or something.. almost everything is possible.
but thats not all^^ the driver itself is prepared to work without the additional microcontroller module, so i can run the coil without the controller module even installed. cause i dont know how an atmega 8 or 16 will feel under such conditions ^^ onboard are also 6 clock independend "kill switches" that can be controlled via the microcontroller or something else, to disable the interrupter signal immediatly.- this swithes can be used in some future series configuration to make use of the coil safier.
im planning to use the controller module to start something like a POST , power on self test, when the user switches the coil on. so the controller controls^^ the coil and will pick up all important signals to make shure everything is ok.. so the user can be shure that everything will work as expected without even stand up from his chair^^ all important signals will be displayed on a 2x16digit display or some bigger (maybe graphical) to show temparature, primary current, on time, off time,, bla bla and so on...
its even possible for this driver to play some sort of a jingle while the coil is turning on and testing with low voltage of course^^ Attached is the nearly finished driver module..
Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
Finished the powersupply today.
15V 3A and 5V 1,5A short circuit protected. there are 4 relias on the board . two relais are for the 230v fan control, the other 2 are to switch the 5v and 15v supply off. each voltage is fused and so on. very robust^^
Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
Got some really nice heatsinks from rs components especially made for igbt bricks.. the heatsinks are perfectly up to the job with holes for those igbt packages and screw rails on the back to mount these heatsinks. i cut some metal sheet for the sides to allow better airflow through the heatsink itself with a 80x80mm 230v fan. the 19" case already arrived. still much to do.
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New DRSSTC 10 driver concept
