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Newly Designed DPSS Laser (and TEC) driver

farbe2

Active member
Joined
Oct 3, 2018
Messages
176
Points
43
Hey Guys,

i am currently working on a DPSS laser driver that includes two Tec drivers that can heat and cool.

The driver is powered by two 18650 cells and uses step down (Buck) converters to step the voltage down for the TECs and the diode.
That makes it quite efficient, i simulated and calculated something around 95% for the TECs and the diode.

Both included TEC drivers can switch the tec polarity to heat and cool both the diode and the crystal. They can deliver a maximum of 6A into the Tec.
The driver controls the power into the TECs with a PID loop to keep the temperature of the diode/crystal steadily regulated.

Same for the diode drive, it can deliver up to 6A into the pump diode and is electronically controlled.

The driver is powered by a microcontroller and features a display that lets you adjust the set point temperature for both tecs and the laser diode current as well as some other stuff.
There are also all other standard features like:
- battery under discharge protection
- reverse polarity protection
- battery state display
- overheat protection
- sensor error detection

Some preliminary pictures:
bef88b16e94f5eed971d258074f7bc26e29b3d20.jpeg
e6b6c4a349aace0875e9c99e034a0fbf0aa19ad7.jpeg

The best part: the driver is just 39x19mm big!


The display interface currently looks like this (but will still change some in future development):
f4e7999cc4bcf6776acb0d531ff1cd8b0bac2e78.png

Showing the battery state, selected pump power level, crystal and diode temp, if the tecs are heating / cooling.
The menu lets the user than select the set point temperature and max diode current.


The development isnt finished yet, however i come close to getting PCBs done for my final version.
So i would like to ask if someone would be interested in buying some of these.
I would than go ahead and order more that i need.
 
Last edited:



hakzaw1

Well-known member
Joined
Apr 2, 2009
Messages
10,695
Points
113
please PM me with price you need--outdoors in a cold climate require the TEC to heat.--nice work!! +rep
 

farbe2

Active member
Joined
Oct 3, 2018
Messages
176
Points
43
Will do.
However, expect this to take some time.
I am still developing the board. I already changed much from my first post.

The driver now got a color display with adjustable brightness.
and I pushed the efficiency up at low tec voltages.


I drop you a PM when I get done and have all the specifications ready.
 

bd1323

New member
Joined
May 1, 2021
Messages
17
Points
3
I would have interest in a handful of these if priced reasonably fairly
 

farbe2

Active member
Joined
Oct 3, 2018
Messages
176
Points
43
Hey bd!

Thanks for your interest.
I dont have a price currently. (more below)
But these drivers are feature packed to the brim and therefore have high parts cost.
We are talking 6 layer boards, >130 components per driver pcb set and 3 PCBs for each "driver".

The development got further so i expand this response into a "whats going on".

I changed the display to something a little more "modern". Its a 1,14" IPS color display with 240x135px. The new display also needed a better microcontroller (which alone costs 7€) to drive the graphics.

The driver now consists of three PCBs.
- the main PCB with all the power electronics, laser driver, two tec drivers and the microcontroller
- the display PCB with the display and an encoder to change settings/navigate the menu
- the power measurement PCB -> consisting of photodiodes to measure relative output power from pump and output beam.

The display will be contacted to the main PCB with a simple flat flex cable.
The Power measurement PCB needs to be soldered.

The driver is still running of 2x LiPo in series.

The current main screen looks something like this:
IMG_1771.JPG

Its still work in progress, so some stuff like the pictures and the diode power graph will still change.

The menu looks like this:
IMG_1745.JPG
IMG_1751.JPG
IMG_1747.JPG

(its very hard to photograph the display without causing moire pattern)

Keep in mind, the menu isnt populated with options. It just shows random stuff to get e feel for the "look" of the menu.

The look is customizable with selectable color schemes. (Two are shown above)

Many settings will be adjustable, like maximum diode current, PID parameters for the tec controller, empty battery thresholds, standby time, menu color.

The driver will get options to select modes (flash/blink/fade).
And will also offer a alignment mode that helps the user to align the laser they have the driver connected to.
That mode will make use of the power sensors to see if a set point temperature change actually increased or decreased the output / absorbed pump power. The driver will display graphs with data from the power sensors.


Pricing:
I am still not finished developing this thing. So there is still stuff open. However i can already say: It won't be cheap.
The parts alone will be more than 50€ per driver set (all 3 pcbs), me placing >130 parts spread over 3 boards will also take a while and including the time spend programming, it gets expensive fast.
So we are talking very roughly 200-250€ per driver set.
Keep in mind that this is a high efficiency, high quality, advanced laser driver for a handheld with many features, not a cheap Chinese battery wasting, diode killing, 2.50$ aliexpress unit.
 

bd1323

New member
Joined
May 1, 2021
Messages
17
Points
3
Hey bd!

Thanks for your interest.
I dont have a price currently. (more below)
But these drivers are feature packed to the brim and therefore have high parts cost.
We are talking 6 layer boards, >130 components per driver pcb set and 3 PCBs for each "driver".

The development got further so i expand this response into a "whats going on".

I changed the display to something a little more "modern". Its a 1,14" IPS color display with 240x135px. The new display also needed a better microcontroller (which alone costs 7€) to drive the graphics.

The driver now consists of three PCBs.
- the main PCB with all the power electronics, laser driver, two tec drivers and the microcontroller
- the display PCB with the display and an encoder to change settings/navigate the menu
- the power measurement PCB -> consisting of photodiodes to measure relative output power from pump and output beam.

The display will be contacted to the main PCB with a simple flat flex cable.
The Power measurement PCB needs to be soldered.

The driver is still running of 2x LiPo in series.

The current main screen looks something like this:
View attachment 74972

Its still work in progress, so some stuff like the pictures and the diode power graph will still change.

The menu looks like this:
View attachment 74974
View attachment 74975
View attachment 74976

(its very hard to photograph the display without causing moire pattern)

Keep in mind, the menu isnt populated with options. It just shows random stuff to get e feel for the "look" of the menu.

The look is customizable with selectable color schemes. (Two are shown above)

Many settings will be adjustable, like maximum diode current, PID parameters for the tec controller, empty battery thresholds, standby time, menu color.

The driver will get options to select modes (flash/blink/fade).
And will also offer a alignment mode that helps the user to align the laser they have the driver connected to.
That mode will make use of the power sensors to see if a set point temperature change actually increased or decreased the output / absorbed pump power. The driver will display graphs with data from the power sensors.


Pricing:
I am still not finished developing this thing. So there is still stuff open. However i can already say: It won't be cheap.
The parts alone will be more than 50€ per driver set (all 3 pcbs), me placing >130 parts spread over 3 boards will also take a while and including the time spend programming, it gets expensive fast.
So we are talking very roughly 200-250€ per driver set.
Keep in mind that this is a high efficiency, high quality, advanced laser driver for a handheld with many features, not a cheap Chinese battery wasting, diode killing, 2.50$ aliexpress unit.
That's all exactly what I was hoping to hear - A well designed, high quality driver assembled by someone that cares about what they are doing. And love the feature set. The anticipated price seems very reasonable as well - looking forward to seeing it progress!
 




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