Electronics Lab Philippines

500watts cdr king power inverter

Offline jovinal64

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500watts cdr king power inverter
« on: March 26, 2016, 06:40:52 AM »
patulong po mga master,cdr king 500watts modified power inverter,ginagamit ko sa  lcd tv,nung bago palang 235 volt ac ang output,pero ngayon bumaba na po,permanent na sa 165 volts ac,kahit walang load o meron,gumagana sa autovolt tv,sinobukan ko sa elec. fan gumana naman pero mahina umikot,permanente rin sa 165volts ang output,

Offline congressman

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Re: 500watts cdr king power inverter
« Reply #1 on: March 26, 2016, 08:19:20 AM »
ganyan din sa akin. under rated ang 500watts. palit mosfet ng mas mataas na specs.
Peace!

Offline jovinal64

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Re: 500watts cdr king power inverter
« Reply #2 on: March 27, 2016, 07:12:17 AM »
master anong parts po dapat palitan para bumalik sa 220 volts ang output?

Offline congressman

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Re: 500watts cdr king power inverter
« Reply #3 on: March 27, 2016, 09:39:22 AM »
yung mosfets sa 12v input side. irfz44 pinalit ko. sa load side fdp52n20 ipinalit ko.
Peace!

Offline Super zHero

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Re: 500watts cdr king power inverter
« Reply #4 on: March 27, 2016, 12:15:41 PM »
Hmmm....
Baka nga output FET.

Offline jovinal64

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Re: 500watts cdr king power inverter
« Reply #5 on: March 28, 2016, 04:55:12 PM »
tenester ko po master pero di ko tinanggal sa pcb, pareparehas naman po palo sa tester,
yung apat na output,saka sa 12volts section dalawang mosfet,

Offline Super zHero

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Re: 500watts cdr king power inverter
« Reply #6 on: March 28, 2016, 05:18:36 PM »
Try mo kalasin one FET from each side of the output, then test all four.
Kasi naka-parallel yang mga iyan.

Offline 576Pinoy_Tech

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Re: 500watts cdr king power inverter
« Reply #7 on: March 28, 2016, 05:28:41 PM »
patulong po mga master,cdr king 500watts modified power inverter,ginagamit ko sa  lcd tv,nung bago palang 235 volt ac ang output,pero ngayon bumaba na po,permanent na sa 165 volts ac,kahit walang load o meron,gumagana sa autovolt tv,sinobukan ko sa elec. fan gumana naman pero mahina umikot,permanente rin sa 165volts ang output,

habang naka hook sa 12v, sukatan mo ang voltage across main filter cap, dapat atleast 310VDC masukat mo.

kung walang 310V, suyod muna sa pwm section lalo na sa feedback path.. usually ang feedback ay binubuo
ng tl431 at photocoupler...

Kung may 310, time to move sa h-bridge portion... baka isa dyan kamag-anak ni apolinario dakilang liyempo...   

Offline jovinal64

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Re: 500watts cdr king power inverter
« Reply #8 on: March 30, 2016, 05:34:34 AM »
thanks po inyong lahat mga master,gagawin ko po,feedback later.add points po kayo lahat

Offline rdpzycho

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Re: 500watts cdr king power inverter
« Reply #9 on: March 30, 2016, 10:59:14 AM »
kung 'yung maliit na 'yan, dagdag fan kapag naayos na.

'di rin ideal gamitin sa mga motor load 'yan.
‎"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
- Rene Descartes

"For every difficult problem there is always a simple answer and most of them are wrong."
- Clayton Paul

Offline Super zHero

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Re: 500watts cdr king power inverter
« Reply #10 on: March 30, 2016, 11:01:51 AM »
Right,,,, modified square waves yan.  Not modified sine wave  :-\

Offline jovinal64

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Re: 500watts cdr king power inverter
« Reply #11 on: April 03, 2016, 05:15:53 AM »
habang naka hook sa 12v, sukatan mo ang voltage across main filter cap, dapat atleast 310VDC masukat mo.

kung walang 310V, suyod muna sa pwm section lalo na sa feedback path.. usually ang feedback ay binubuo
ng tl431 at photocoupler...

Kung may 310, time to move sa h-bridge portion... baka isa dyan kamag-anak ni apolinario dakilang liyempo...   

master 270 volts dc nasukat ko sa main filter capacitor,mababa po ba ito?

Offline 576Pinoy_Tech

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Re: 500watts cdr king power inverter
« Reply #12 on: April 03, 2016, 08:52:49 PM »
kulang yan pag kinonvert na sa simulated ac... try mo lagyan ng load na 100w bulb dyan
mismo sa cap na sinukatan mo at test mo kung mag drop ng malaki,, kung bumabagsak,
dyan pa lang mag error na agad,, once na fix na yan then test sa final output at kung may
sabit pa konte chk yung h-bridge section, composed yan ng 4 identical hv msfet...
sana may scope ka para madali mong makita ang prob... pwedeng gumamit ng pc scope
tutal low f lang naman yan... btw, make sure na yung 12v psu mo ay hindi bumabagsak ng
malaki, may certain limit lang yung capability ng feedback correction....









Offline jovinal64

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Re: 500watts cdr king power inverter
« Reply #13 on: April 04, 2016, 06:40:02 PM »
kulang yan pag kinonvert na sa simulated ac... try mo lagyan ng load na 100w bulb dyan
mismo sa cap na sinukatan mo at test mo kung mag drop ng malaki,, kung bumabagsak,
dyan pa lang mag error na agad,, once na fix na yan then test sa final output at kung may
sabit pa konte chk yung h-bridge section, composed yan ng 4 identical hv msfet...
sana may scope ka para madali mong makita ang prob... pwedeng gumamit ng pc scope
tutal low f lang naman yan... btw, make sure na yung 12v psu mo ay hindi bumabagsak ng
malaki, may certain limit lang yung capability ng feedback correction....

maraming salamat po master,da best ka talaga,gagawin ko po,

Offline 576Pinoy_Tech

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Re: 500watts cdr king power inverter
« Reply #14 on: April 09, 2016, 12:20:27 PM »
maraming salamat po master,da best ka talaga,gagawin ko po,

be it known with 100w load @ 12v input, your psu current input min. must be;
(assuming 80% eff.) --> I = (P/V) / eff. --> (100/12) / 80% = 10.416A