Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

[Tinker Ray]

I suspect that ALL of the commercial VV/VW mods never actually turn off...the fire switch activates the logic circuit for on/off function and therefore the logic circuit always draws a small amount of current? With the raptors, the on/off zener could be wired directly to Vin+ and the (full current rated) fire switch would be from the battery to the raptor module. It would have to be like a mech mod switch, preferably with a lock out function. I am not crazy about that idea though, but it would be do the job. My current mod (see my avatar) uses a kick module and the fire switch is on the negative side of the system to completely disconnect the system when off.

 

[Rapture]

I like whats going on here with these ideas floating around but none of you guys seem concerned at all about the lack of chips available to the public. Is there something I'm missing here? Please pm


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[BJ43]

I suspect that ALL of the commercial VV/VW mods never actually turn off...the fire switch activates the logic circuit for on/off function and therefore the logic circuit always draws a small amount of current? With the raptors, the on/off zener could be wired directly to Vin+ and the (full current rated) fire switch would be from the battery to the raptor module. It would have to be like a mech mod switch, preferably with a lock out function. I am not crazy about that idea though, but it would be do the job. My current mod (see my avatar) uses a kick module and the fire switch is on the negative side of the system to completely disconnect the system when off.

Yes my two raptor pass thrus have a rated fire switch on the Vin.. Use these in my truck off a 20 amp fuse.

 

[BJ43]

I like whats going on here with these ideas floating around but none of you guys seem concerned at all about the lack of chips available to the public. Is there something I'm missing here? Please pm


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I bought 4 before they ran out....

 

[Tinker Ray]

I'm actually prepping for the 10amp 60watt version - the new NQR (not NSR) model, $8.55 at Mouser, in stock. I have the entire list of parts for the price of the 120watt module alone. I like the fact these are industrial grade parts available in the US. They are available to the public, they just take a bit of work to fit into our requirements, which is at least half the fun!

 

[david4500]

I like whats going on here with these ideas floating around but none of you guys seem concerned at all about the lack of chips available to the public. Is there something I'm missing here? Please pm

CC109130911 for GE Energy (formerly Lineage Power) | Arrow Electronics Components

 

[Tinker Ray]

Good Job! good price too.

 

[branflan]

Does anyone know of an alternative part for the PFET? Si7157DP seems to be out of stock everywhere I've looked including Octopart. I'm not well versed enough to look at the datasheet and search for something similar.

Nevermind, I'm an idiot. Found the updated part on page 21.

 

[ukeman]

I bought 4 before they ran out....

All the box mod vendors with these 10 and 20amp chips are closed until the chips are restocked ... someone said someone bought up hundreds even thousands of them....

the way a 100w box from a commercial site gets snapped up in minutes, and they are all "out of stock" tells me these will be flooding the market at some point. More likely, along the way keeping the price for a finished box pretty steep...

 

[Rapture]

I'm actually prepping for the 10amp 60watt version - the new NQR (not NSR) model, $8.55 at Mouser, in stock. I have the entire list of parts for the price of the 120watt module alone. I like the fact these are industrial grade parts available in the US. They are available to the public, they just take a bit of work to fit into our requirements, which is at least half the fun!

Please share this list friend


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[Tinker Ray]

Gladly, Rapture
Please note that a good bit comes from Mamu's work on this thread and I have spliced in a different Raptor and voltage indicator. Thanks Mamu! what a fantastic thread!

The parts from Mouser cost less than $20 + shipping not including the fire switch - I already had a bunch from DigiKey. The 4 light voltage status indicator is an experiment really. I didn't want to order a meter from China, etc, plus this is a bit different. The schematic is in the data sheet for the comparator IC. I scaled the resistors so all 4 LEDs light at/above 8v, 3 LEDs @ 7.4v, 2 LEDs @ 6.8v, 1 LED @ 6.2v, all out below 6.2v. Might be cool, BUT...the parts for the indicator cost $4.91, so I guess it better be REALLY cool.

Fire Switch (Digikey) KSJ0M211 80SH LFT

from Mouser:

Raptor VV:
NQR10A0X4Z (10A 60W)
Mosfet: SUP75P03-07-E3
250r trimmer: PT10MV10-251A2020
trimmer shaft: JPEPL501NE
5.6v Zener diode: TZX5V6C-TR
Ceramic Caps: 2x FK11X7R1C226M
Resettable fuse: PPTC RGEF1000-2
LED-red: SLC-22VR3F
metal film resistors 1/4w: 1x 7.5k, 1x 220r

battery status indicator (4 light)
4 channel comparator IC: MAX934CPE+
LED green: 4x SLC-22MG3F
SPDT slide switch: SSAA120200
metal film resistors 1/4w: 1 each- 768k, 182k, 698k, 100k;
3x 80.6k; 4x 330r

hope this helps,
Ray

 

[Rapture]

Thanks ray I'll be looking into this. Will it still basically be the same just built using a different chip and different components to reach the same outcome. Is the max output still 6v?


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[mamu]

The Raptor 10A pin placement, wiring, and parts is exactly the same as the OKR-T10.

 

[mamu]

@ Tinker Ray - great idea using an IC comparator for the batt voltage monitoring.

Since I can't use a zener with the OKL2-T20 I'm using the LTC1440 to monitor batt voltage - it has an ultralow 4uA standby current.

I wired it for a 6.2v low voltage indicator. If the batt's voltage is >6.2v, the red LED does not light. When the batt's voltage is at or less than 6.2v, the red LED lights telling me it's time to charge the batts. The red LED has a sharp 6.2v turn on - no tweens and no dimming.

Here's a link to the datasheet: http://cds.linear.com/docs/en/datasheet/144012fd.pdf

Here's the schematic...

Here's what it looks like breadboarded... the voltage is set at 6.2V on my DC power supply, the red LED lights...

Here's what it looks like with everything tucked under the IC...

Here's the parts list... you could use 1% resistors if you choose, but I used 5% without issue...

 

[Tinker Ray]

As far as I can tell, all of the NSR... NQR... modules are the same except for power capacity. The 120w version is on a larger board, most likely for larger components/heat management. Same trim values to set voltage, same capacitors will work, etc. Up to 10a/60w they all have the same form, only real difference is the height of the coil.

yes, 6v max rated although it probably could be pushed a bit higher, also the wattage. I was checking out a buddy's raptor 6v 60w mod the other day (not as sophisticated as what is in this thread). It had a .45 ohm dual coil atty and he asked if I'd like to try it at full power...it about knocked my head off, like sucking on a forest fire. 6v/.45r=13.33a, 6vx13.33a=80w!!! The 60w raptor will actually do it according to the specs when you consider the allowed margins, probably starts to get hot though. It would be good practice to allow a little ventilation around the module. No shrink wrap allowed, at least in my builds...

 

[Tinker Ray]

hi Mamu,
your low voltage indicator is a lot smaller than my indicator will be. I considered a two bulb indicator for high, low, off. Trouble is, the cost of the chip is higher than what I bought (I have a lot of Scot in me...)

 

[BJ43]

@mamu: Could an IC comparator be used to control the gate of a 20 amp P mosfet on Vin and in this way make a LV master cutoff for the raptor 20 amp? This would eliminate the zener as your voltage cutoff would be on the Vin and never let the batteries totally discharge if left idle.

Looking at the schematic. You would need an IC comparator that turned off a led instead of on..hmmm..

 

[mamu]

@mamu: Could an IC comparator be used to control the gate of a 20 amp P mosfet on Vin and in this way make a LV master cutoff for the raptor 20 amp? This would eliminate the zener as your voltage cutoff would be on the Vin and never let the batteries totally discharge if left idle.

I haven't tinkered with it, but sounds doable. A zener controlled MOSFET gate would also work.

 

[mamu]

...Looking at the schematic. You would need an IC comparator that turned off a led instead of on..hmmm..

That would simply be a matter of re-configuring the resistors for the comparator. In my setup, I have the comparator configured to light the LED on low voltage. It can also be configured to turn off an LED at low voltage.

 

[mamu]

The primary problem with adding another MOSFET, in addition to the reverse polarity MOSFET, is the space required inside the mod for this extra circuitry.

The best solution is a supervisory IC. I was working with that with the OKL2-T20 and what is available for the voltage cutoff we need is teeny tiny (really really teeny tiny ) smt parts.