Arber333: Created page with "thumb This DCDC unit takes the 280-400VDC HV battery pack input and converts it to 13-15VDC for the 12V AUX battery charging. It is very stable at 74 Amps 13.6V output. Easily adjustable voltage output with a simple 10V PWM signal running at about 9 HZ on pin 1 and pin 3 and 11 go to +12V to enable. When i googled around i noticed this particular DCDC is documented on various sites and videos, howeve..."

2024-08-31T20:22:12Z

Created page with "thumb This DCDC unit takes the 280-400VDC HV battery pack input and converts it to 13-15VDC for the 12V AUX battery charging. It is very stable at 74 Amps 13.6V output. Easily adjustable voltage output with a simple 10V PWM signal running at about 9 HZ on pin 1 and pin 3 and 11 go to +12V to enable. When i googled around i noticed this particular DCDC is documented on various sites and videos, howeve..."

New page

[[File:0000628 blogimages-1.jpg|thumb]]
This DCDC unit takes the 280-400VDC HV battery pack input and converts it to 13-15VDC for the 12V AUX battery charging. It is very stable at 74 Amps 13.6V output. Easily adjustable voltage output with a simple 10V [[wikipedia:Pulse-width_modulation|PWM]] signal running at about 9 HZ on pin 1 and pin 3 and 11 go to +12V to enable.

When i googled around i noticed this particular DCDC is documented on various sites and videos, however not with schematics or wiring diagrams…
I used some photos and wiring from here: http://myimiev.com/forum/viewtopic.php?t=4533
Starting with connection of the 12v positive terminal to battery
And then GND the case back to battery negative terminal
I connected HV directly to DCDC input wires.
[[File:Img 20210328 195231.jpg|alt=|thumb|wiring]]
[[File:0000627 blogimages-2.jpg|thumb]]
Then referring to plugs F11 & F12
Terminal 3 and 11 would need +12v for Battery power supply
Pin 1 needs a PWM signal 9Hz 50% duty to it

Well it was all good and well with the wiring obtained online, however i noticed that DCDC starts as soon as i provide 12V to pins 3 and 11 of connector and provides 14V power to charge 12V battery.

When i added 9Hz PWM to pin 1 of connector F11 i got following result: 
PWM voltage 
80% 13,10V 
70% 13,40V 
60% 13,70V 
50% 14,00V 
40% 14,30V 
30% 14,70V 
20% 15,00V 

If i remove PWM from pin 1 i again get 14V on DCDC output.

Also i tested the output with 14V 85A load (9x H4 light bulbs and 60Ah Pb battery) and DCDC provided true and steady 14V power.

=== CAN bus messages ===

A database of Nissan Leaf CAN Bus messages can be found here https://github.com/dalathegreat/leaf_can_bus_messages

[[Category:Nissan]]

Nissan Leaf DC-DC converter - Revision history