#17 H2O2 PWM 15Amp Current Test

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Update: Original Release
A 50% Duty Cycle Is where the Mosfet will operate the hottest. The ON and OFF times have equal distances between them so when the MosFet turns on there will be some heat generated and then there is the time to dissipate that heat into the Heat sink (The Case). Then the off time does the same and that heat is dissipated over and over again. If the duty cycle is longer or shorter, the dissipation time is always longer. This should provide a excellent test for the how cool this design will work.

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[crafter2u]

Im sure the world is as eager to see your new pwm as i am, any idea on when you might post it on your web page?

[H2O2FromH20]

I have to finish conditioning my cell, its A new drycell. I want to run it with KOH at 30 Amps and My PWM then do Temperature test and look at the wave form, to make sure every thing will run smoothly. I would have to estimate 2 weeks. I dont have a lot of time to devote to HHO. If you look at my website I have 2 other projects ongoing Zspan and PowerStick these designs are to be used at my work as test equipment. Plus my cell install!

[crafter2u]

im just wondering how the avarage jo is suppost to set up the PWM, why dont you just make something that is preset?

[H2O2FromH20]

My documented adventure on YouTube so far had been what I have learned the mistakes and breakthrough I have made. I give this information freely, So far I have not published any Documentation simply because it is not ready for reproduction. It must meet strict functional tests. As far as a preset device, this would be hard for me to preset up the device that you make and install. At this time I have no intention to make PWMs for other people.

[H2O2FromH20]

I may consider making the PCB( The copper clad board with traces) for a nominal cost. The Idea of having a calibrated board that the end user could quickly adjust to some preset voltages in not impossible. And I have been thinking heavily on this subject. The problem with calibration of the PWM now is the Current Shunt, ZeroFossilFuel calls it R12. Each R12 is different, how do I know what one Amp is or thirty amps is on your Units Shunt?.

[H2O2FromH20]

I have confirmed in circuit that R5 Will Change the DC bias at U1 Pin 9, I used a 7.5K at R5 and Modified the Frequency to 11.6KHz with a 1.21K at R1, and I had 100% duty cycle through the bandwidth. Still need to improve the lower limit, currently its at 1.36KHz would like it to be in specification at 1KHz.

[cuke8466]

I have some ExpressPCB layout files for blank boards for the G106. Message me with your email and I'll send them to you.

[H2O2FromH20]

Speeking of through hole! do you have the Velleman G106 sealed die cast aluminum enclosure that ZFF used on his PWM? I can not determin the exact size of his board, I was going to make a through hole version for those not ready for Surface Mount.

[H2O2FromH20]

A smaller cap is helpful. I have used SMD for the past 9 years where I work. I think it has meny advantages over through hole, and if you are laying out your own boards, You controll the pad size. I have layouts that can use several diferent caps on the same pad. You can mount older through hole as SMD like chips and even pots, like I do on my PWM. There are some exeptions like Plugs that need strength. No drilling 74 holes like ZFF stated in one of his videos. Make Solder wick your friend

[cuke8466]

I've always used through hole components in my circuits and was thinking about giving SMD a try. Looking at some of the videos here on youtube, assembly looks like it may be easier with surface mount. Which method do you prefer?