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How do you modify SMPS for adjustable current and voltage output?
You can assemble the TL431 section on a small piece of general purpose PCB and glue it on the main SMPS board. If your SMPS circuit does not have an output filter coil, you can simply short the two positives of the TL431 circuit and join the termination to the cathode of the SMPS output diode.
Why it is called linear power supply?
Linear regulated power supplies gain their name from the fact that they use linear, i.e. non-switching techniques to regulate the voltage output from the power supply. The term linear power supply implies that the power supply is regulated to provide the correct voltage at the output.
How does a linear power supply work in AC?
Linear power supplies can only step−down an input voltage to produce a lower output voltage. A linear power supply typically uses a large transformer to drop voltage from an AC line to a much lower AC voltage, and then uses a series of rectifier circuitry and filtering process to produce a very clean DC voltage.
What are the disadvantages of a linear power supply?
A linear power supply typically uses a large transformer to drop voltage from an AC line to a much lower AC voltage, and then uses a series of rectifier circuitry and filtering process to produce a very clean DC voltage. The disadvantages are weight, size, and low efficiency.
How to make a variable voltage power supply?
My procedure was roughly the following (all processing done in Photoshop): Scan the bottom side (tracks) and stick it into Photoshop. In a new layer, make white dots over every one of the pads/vias/holes. This will help both for aligning things later, and for producing a nice image.
What’s the maximum voltage of a switchmode power supply?
Analysis, operation, and modification of a switchmode power supply (SMPS) for variable output voltage (28/10/15) End result: 33A maximum output current, adjustable from 4.8V to 15V 7.5V supply availability After this page was posted on Hackaday, a commenter pointed out that 7.5V is actually a standard power supply voltage!