TheBackShed.com

Forum Index : Microcontroller and PC projects : prototype inverter

Author

Message

sparkey

Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 819

Posted: 09:56pm 16 Aug 2011

Copy link to clipboard

Print this post

ok where to start:i have the "SM1" by tctek..from :"don". connected to the breadboard from hamfeild .. running a twelve volt plug pack 500ma..on the breadbord is a 4013 cmos running as a "d-type-flipflop" connected via 500 ohm resistors to the base`s of two "bc-549" the voltage rail is from the 5 volt reg conneted to the collectors and the cmos chip.. the emmitters have 200 ohm resistors then connected to two "tip-31`c"..in darlington formation.. then connected to the bases of two banks of 7 X "2n3055`s the collectors r conected to the the centre tapped transformer with the centre tap connected to the positive supply ...the emmitters are connected to the negative suppl rail ....also from the supply negative is connected to the grnd of the breadbord ...think that wraps up the hardwhare ,,...

::the soft whare was supplied by "seco61-gerard " the software program

::also you will need the sorce code to run this "supplied by gerard as well

::freq adjustable between 1-5000 Hz

::mark-space-ratio adjustment in a percentage between 0-100 percent

:: it has a volt meter to monitor the battery voltages

:all these values are displayed in text form on the screen and allowing for real time adjustment of frequency and mark space ratio :::

:thanks to "altro for winding me a 64v centre tapped transformer at 400 va::
:thanks to altronics for the passive and active components and that just about wraps that up at the moment it is taking up the whole kitchen table and i have a 4 teer rack mount to house it in with a 25 amp ammeter ...

:it runs a modified squarewave sort of looks like a square wave but has a step in each slope...

:::: sparkey::::Edited by sparkey 2011-08-18

technicians do it with least resistance

haiqu

Senior Member

Joined: 30/07/2011
Location: Australia
Posts: 152

Posted: 08:24am 17 Aug 2011

Copy link to clipboard

Print this post

What are you driving with this thing, motors or something?

Rob

unzip, strip, touch, finger, grep, mount, fsck, more, yes, fsck, fsck, fsck, umount, sleep

sparkey

Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 819

Posted: 08:45am 17 Aug 2011

Copy link to clipboard

Print this post

my stereo ,my heater,my tv,my computer etc,.....oh i have a 1000 va transformer for it as well but finding that i dont need that much grunt ......un less i want to run the washing machine .....with power factor caps all can be achived....

:now the maxi and the breadboard are all fitted up and running finally ahhh...Edited by sparkey 2011-08-19

technicians do it with least resistance

VK6MRG

Guru

Joined: 08/06/2011
Location: Australia
Posts: 347

Posted: 07:17am 19 Aug 2011

Copy link to clipboard

Print this post

So an inverter?

Its easier to ask forgiveness than to seek permission!

............VK6MRG.............VK3MGR............

sparkey

Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 819

Posted: 04:21am 20 Aug 2011

Copy link to clipboard

Print this post

well last nite i had the maxi inverter running for a solid six hours playing my tunes running my 5000 rebuild with exicons and my uld subby 400 watt and also my computer ...atm i am just running my computer ...the maxi inverter is running a tc-tec SM! i am waiting for the parts for the R_T_C so hopefully i will be able to also dispay up time on the screen it also has a voltmeter that i put a voltage divider of a ten k pot the unit atm is running straight of my solar panels of corse they are connected to batterys but the centre zero ammeter is sitting at zero...regards sparkey ..you cant stop progress ..

technicians do it with least resistance

sparkey

Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 819

Posted: 08:33am 20 Aug 2011

Copy link to clipboard

Print this post

the lunar module has been repaird well its off to the moon next ...cheers don...

well i have added a twist to the output of the switching cct i have modded the bread board with a lm317t and am running in to it with 18 volts ... the 317 is powering the two output transistor arrays each containing a bc549 and a....... tip 31c ...then a couple of 39 ohm resistors ..the cmos chip is running of the 3.3 volt rail the lm317 will prolly need a larger heat sink as it gets quite warm when it`s resisting a heap of current that is comming from a lm317t ...ok the power suplly goes 38 volts input to a lm317t bolted to the case of the rackmount alloy then it drops the voltage down to 18 volts then thast is fed into a tip31c good for 40 watts ithink of hand out to the bread board input rail the regulators can handle high voltage but can only give 1 amp out max ..except for the 317t which is 1.5 amps hence ..in that you have the latest i may add a op amp between the cmos and the transistor array not shure yet the bread board is not that big i will get another board for it in my next order from rohan ....Edited by sparkey 2011-08-22

technicians do it with least resistance

sparkey

Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 819

Posted: 02:24am 24 Aug 2011

Copy link to clipboard

Print this post

also i would like to note that u need to have a switch on the two out puts of the switching cct as it tends to float around on the out puts from the chip...giving time for the maxi to boot up.. and run the autorun program ..then when the program is running switch the out put from the switching cct into action this may well be a design fault on my behalf but if you dont do this it will blow your switching transistors every time

technicians do it with least resistance

sparkey

Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 819

Posted: 10:09am 28 Aug 2011

Copy link to clipboard

Print this post

ok i`m getting itchy i am going to replace the 2n3055`s with "exicon " "n- type fets "

::and do a cct redesign got my electronic text books of the shelf "edwards and myer for a start ...they have some sample basic ccts ...regards will keep every body posted on how this comes out got all the hardwhare so see if this makes a differenc4e... oh yes it is running atm with the 3055`s

technicians do it with least resistance

sparkey

Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 819

Posted: 10:59am 28 Aug 2011

Copy link to clipboard

Print this post

well it looks like i am going to put a relay time up cct accross the out put...giving time for the maxi to load the signal generator program so that the relay kick`s in about 3 seconds after power is applied ... ive tried eathing resistors on the out put of the pre driver transistors but still having a problem and as for the mosfets well i think that the cct will have to be much more advanced than i thought so that`s the that on that point regards sparkey...

technicians do it with least resistance

sparkey

Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 819

Posted: 12:02pm 05 Sep 2011

Copy link to clipboard

Print this post

modified code that gerard wrote from sparkey i`m trying to do it ....

5 'initialise I/O pins
10 voltpin = 1 'set analog voltage input pin (can be 1 - 10)
15 voltpin = 2 'set analog voltage input pin (can be 1 - 10)
20 voltpin = 3 'set analog voltage input pin (can be 1 - 10)
30 pwmpin = 8 'set the pwm output pin (can be 7 - 10)
40 freq = 100 'set initial frequency to 100Hz (can be 1 - 5000)
50 duty = 50 'set initial duty cycle to 50% (can be 0 - 100 in increments of 1)
60 offset = 0 'use to adjust for any offset in analog input
70 coefficient = 20 'use to scale the analog input
80 tick_avg = 100 'number of analog voltage samples to average each second
85 tick_flag = 0
90 tick_cnt = 0
95 DIM tick_array(tick_avg)
100 SETPIN voltpin,1 'configure pin for analog input
115 SETPIN pwmpin,10,freq,duty 'initiate PWM output
120 SETTICK CINT(1000/tick_avg),1100 'set tick interrupt for tick_avg per second
150 duty_str$ = "Enter duty cycle (0 - 100 for 0% - 100%), 'F' to change frequency or 'Q' to quit"
160 freq_str$ = "Enter frequency (1 - 5000 for 1 - 5kHz), 'D' to change duty cycle or 'Q' to quit"
200 CLS
210 volt = offset + (PIN(voltpin) * coefficient)
220 state = 1
230 LOCATE 0,24 : ? "MAIN BUSS A v+ =";
232 LOCATE 108,24 : ? FORMAT$(volt,"% .3fV ");
236 LOCATE 0,156 : ? "9 VOLT RAIL V+ =";
240 REM LOCATE 108,156 : ? FORMAT$(volt,"% .3fV ");
244 LOCATE 0,196 : ? "5 VOLT RAIL V+ =";
247 REM LOCATE 108,196 : ? FORMAT$(volt,"% .3fV ");
252 LOCATE 0,60 : ? "Running frequency =";
255 LOCATE 114,60 : ? freq; "Hz ";
260 LOCATE 0,96 : ? "Mark space ratio =";
262 LOCATE 108,96 : ? duty; "% ";
266 LOCATE 0,132 : ? duty_str$
300 DO WHILE state > 0
310 GOSUB 500
320 IF state = 1 THEN
330 IF number >= 0 AND number <= 100 THEN
332 duty = number : SETPIN pwmpin,10,freq,duty
334 ELSE
336 GOSUB 900 : ? number; " - Invalid duty cycle!" : PAUSE(1000) : GOSUB 900
338 ENDIF
340 ELSEIF state = 2 THEN
350 IF number >= 1 AND number <= 5000 THEN
352 freq = number : SETPIN pwmpin,10,freq,duty
354 ELSE
356 GOSUB 900 : ? number; " - Invalid frequency!" : PAUSE(1000) : GOSUB 900
358 ENDIF
360 ENDIF
370 LOCATE 102,24 : ? FORMAT$(volt,"% .3fV ");
375 LOCATE 114,60 : ? freq; "Hz ";
380 LOCATE 108,96 : ? duty; "% ";
390 LOOP
395 SETPIN pwmpin,0
399 END
499 ' get number routine
500 GOSUB 900
510 DO WHILE 1
512 IF tick_flag = 1 THEN
514 tick_flag = 0
516 LOCATE 108,156 : ? FORMAT$(volt,"% .3fv ");
520 LOCATE 108,196 : ? FORMAT$(volt,"% .3fv ");
521 LOCATE 108,156 : ? FORMAT$(volt,"% .3fv ");
522 LOCATE 102,24 : ? FORMAT$(volt,"% .3fV ");
523 LOCATE 114,60 : ? freq; "Hz ";
524 LOCATE 108,96 : ? duty; "% ";
525 LOCATE LEN(numstr$) * 6,144
526 ENDIF
528 inpkey$ = UCASE$(INKEY$)
530 IF inpkey$ = "" THEN GOTO 520
540 IF inpkey$ = "Q" THEN state = -1 : EXIT
550 IF inpkey$ = "D" THEN
551 LOCATE 0,132
552 ? duty_str$
553 state = 1
554 GOSUB 900
555 GOTO 520
559 ENDIF
560 IF inpkey$ = "F" THEN
561 LOCATE 0,132
562 ? freq_str$
563 state = 2
564 GOSUB 900
565 GOTO 520
569 ENDIF
580 IF inpkey$ < "0" OR inpkey$ > "9" THEN
590 numlen = LEN(numstr$)
600 IF ASC(inpkey$) = 13 THEN
610 IF numlen = 0 THEN number = -1 ELSE number = VAL(numstr$)
620 EXIT
630 ELSEIF ASC(inpkey$) = 8 THEN
640 IF numlen > 0 THEN
650 IF numlen <> 1 THEN numstr$ = LEFT$(numstr$, numlen - 1) ELSE numstr$ = ""
660 csr = (numlen - 1) * 6
670 LOCATE csr,144 : ? " "; : LOCATE csr,144
680 ENDIF
690 ENDIF
700 ELSE
710 numstr$ = numstr$ + inpkey$
720 ? inpkey$;
730 ENDIF
750 LOOP
760 GOSUB 900
799 RETURN
899 ' clear input
900 numstr$ = ""
910 LOCATE 0,144
920 ? SPACE$(80)
930 LOCATE 0,144
999 RETURN
1099 ' settick interrupt routine
1100 tick_cnt = tick_cnt + 1
1110 tick_array(tick_cnt) = offset + (PIN(voltpin) * coefficient)
1120 IF tick_cnt <> tick_avg THEN IRETURN
1130 volt = 0
1140 FOR i = 1 TO tick_avg
1150 volt = volt + tick_array(i)
1160 NEXT i
1170 volt = volt / tick_avg
1180 tick_cnt = 0
1190 tick_flag = 1
1199 IRETURN

technicians do it with least resistance

sparkey

Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 819

Posted: 03:40pm 06 Sep 2011

Copy link to clipboard

Print this post

once again gerard saves the day all is good "hewston we have lift off"""

technicians do it with least resistance

Print this page

To reply to this topic, you need to log in.