Author Topic: SSTC reverse engineering and simulation  (Read 184 times)

Offline Sugarb0y

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SSTC reverse engineering and simulation
« on: June 27, 2024, 03:55:19 PM »
I am trying to reverse engineer an aliexpress SSTC PCB module. I probed and measured the driver circuit componenets and got this schematic: https://imgur.com/FXMV1K2.

Picture of the pcb: https://imgur.com/BciDB9y
The model of the 2 mosfets connected to the feedback from the secondary is NCEP0230D (M1 and M2 in oscilloscope measurements)
The other mosfets model is G053N10 (M3 in oscilloscope measurements)
I am not sure if the diodes are TVS diodes. The only marking on them is "BGM" and the only similar part I found was SMCJ64CA (https://m.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smcj_datasheet.pdf.pdf)
The power circuit runs on 48V while the 555s for the driving signal run at 12V
Here are some signals measured with the oscilloscope: https://imgur.com/a/oscilloscope-measurements-jtcmVKv

The potentiometers control the frequency and duty cycle of the signal fed into the gate of M3. The frequency can vary from ~25 to ~150Hz

From what I can tell I think they arefloating the gates of M1 and M2 so that with the feedback from the secondary is enough to switch the mosfets off and on. Is this correct?

I tried simulating in LTSpice (https://drive.google.com/file/d/1WKS0CFihLaoG9BFmubod8igloCP1nHFK/view?usp=sharing) choosing mosfets that are similarish to the ones on the pcb but I couldn't get it to oscillate unless I removed C3. Even then it didn't oscillate at the ~4.6Mhz frequency I measured with an oscilloscope and the output voltage according to the simulation doesn't even reach 10V.

What could be the problem in the simulation?
What type of oscillator/amplifier is this circuit using?
Is there smething or somwhere I can read that explains how this circuit works and what type of circuit it is?

Ty in advance.

Offline davekni

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Re: SSTC reverse engineering and simulation
« Reply #1 on: June 28, 2024, 08:04:43 PM »
Quote
I probed and measured the driver circuit componenets and got this schematic: https://imgur.com/FXMV1K2.
Measuring component values in circuit is difficult to do correctly.  Measurements are of all circuit paths from one lead of a component to the other, not just the component you are attempting to measure.

Quote
I tried simulating in LTSpice (https://drive.google.com/file/d/1WKS0CFihLaoG9BFmubod8igloCP1nHFK/view?usp=sharing) choosing mosfets that are similarish to the ones on the pcb but I couldn't get it to oscillate unless I removed C3. Even then it didn't oscillate at the ~4.6Mhz frequency I measured with an oscilloscope and the output voltage according to the simulation doesn't even reach 10V.
Simulation is a great way to understand circuits!  Back to above point, look at resonant capacitor and inductor values in the circuit you drew.  Calculate order-of-magnitude frequency for those components.  Not at all close to actual circuit frequency, indicating as above that circuit component values are way off from actual.
David Knierim

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Re: SSTC reverse engineering and simulation
« Reply #1 on: June 28, 2024, 08:04:43 PM »

 


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