Is this circuit a flyback circuit?

[Chriss]

Hi!
I'm not sure what the hack is this circuit for ot the schematic I put as attachment here.

Let's describe the circuit I draw based on the pcb I'm repairing:
Please don't pay attention to the values, they are incorrect.

The Q1 and Q2 are controlled by a uC.
The L1 and R3 are representing a solenoid coil or relay, name it as you wish.
The D1 is a TVS diode.
The D2 is a fast recovery diode.

I'm confused with the circuit of Q2 and D2.
Are this circuit tries to be a flyback circuit which is controlled through the uC?

It looks like that but I'm not sure.
I never saw this kind of design.

I'm also not really sure what does exactly the D1, C1 and C2 are doing?
Some filtering?
The D1 is a TVS diode in series with the C1 and C2 which value together is 1uF.

Is this a common used design or I am missing something?

Thank you.

[T3sl4co1l]

Q2-D2 draws no current as shown.  You've probably missed some connections or components.

Also D1 only charges the capacitors once.  Presumably there's a resistor to discharge that, so it's an RCD clamp snubber.  Or you've drawn D1 backwards and its TVS action kicks in instead.  Still doesn't make much sense though.

Tim

[Chriss]

Thank you and sorry for my dummy post.
After you agree with the "nonsense" circuit I rechecked again
and solved the "mystery" of the D2 - Q2 circuit.
There are more components related to this circuit but on another
region of the pcb where I didn't expected to be...

But I didn't found anything else about the D1 and C1 - C2.
It is just as I draw it.
Even no discharge R. 
Makes no sense at all.

Thanks again and sorry, but sometime I need a brain kick... 

[magic]

Maybe one of the "capacitors" is actually a resistor if you look closer?

Alternatively, the point between D1 and C1,C2 might be the 12V rail.

[fzabkar]

Q1, D1, C1/C2, R3, L1 constitute a switchmode boost converter.

Q1 switches on, and current flows through L1. When Q1 switches off, the current decays via D1 and charges C1/C2. That's the boosted output voltage. I expect that the uC should have some way of sensing the voltage on C1/C2, probably via a resistive potential divider.

[Chriss]

You are right with the 12v rail.
There is a 12v rail what I can't see, but after you give this idea I checked the pinout and I really found the 12v rail.

Thanks mate for the idea.

In this case the C1 and C2 could be a sort of noise filter or?
I tried to measure resistance on the C1 and C2 but no, there is no resistance.
For the C2 I'm sure it is a cap, but for the C1 90% sure.

[fzabkar]

A boost converter steps up the voltage from 12V to something else. The voltage across C1/C2 should be greater than 12V -- that's all that I can tell from your circuit.