14V SMPS Circuit

This 14V SMPS Circuit talk about power supply that gives 14V and 1 amp output.

It is a useful circuit and is used for many thing.

This circuit helps for some old electronic parts work again.

No need to explain too much how it work because it almost same like one old power supply before in article that one was 3.3V with 2.5 amp.

But this one show how to make 14V/1A power supply and how to choose parts and know what value they need.

Making switching power supply is not easy so better follow steps careful for safety and be sure it work good.

What is a 14V SMPS Circuit:

A 14V SMPS (Switched Mode Power Supply) circuit make 14 volt output and this voltage stay same and stable.

It are used in many electronics where there is need for good power like for powering devices, LED lights or which gives steady power to other circuits.

SMPS circuit are common for this job.

Circuit Diagram:

Parts List:

How to Build:

Using ohms law to Find R1:

We have used ohms law: R = V / I.

We must find resistance R1 value to get output voltage between 8V and 18V.

Transformer Winding:

First wind 27 turns on ferrite core for one side of primary coil and then use correct wire size and then put 8 layers of insulating tape.

Next wind secondary coil with insulated wire for safety and then add again 8 more layers of tape.

Now wind auxiliary coil and make 4 turns using same wire like primary and add one more insulation layer.

After that wind rest of 27 turns for the primary coil and put some more tape layers to make safe.

Make Air Gap:

To make 0.2 mm air gap place two paper pieces or insulation tape between core halves.

Core Assembly:

Join the two core pieces tightly so connection is strong.

PCB Design:

Design PCB layout so primary and secondary sides have enough space.

Solder all parts like MOSFET/IGBT half-bridge driver, resistors, capacitors and diodes just like in circuit diagram.

Connect Transformer:

Be sure transformer wires like primary and secondary connect to correct places on PCB.

Test and Adjust:

Turn ON the circuit and check output voltage.

If voltage is not in 8 to 18V range then adjust R1 resistor until output is correct.

Safety Check:

Check all parts are connected well and solder is OK.

Check for short circuits or loose wires.

Power input must be between 80 to 250V AC or 80 to 350V DC.

Final Enclosure:

Put all in safe case if needed.

Be sure everything is safe and looks neat.

Formulas:

14V SMPS Circuit Need More Calculation:

To make 14V SMPS safe and work good we need more calculation just like the 3.3V example.

We have used easy formulas to help:

Duty Cycle (D):

Duty cycle will tell how long switch stay ON and OFF as it works same like in 3.3V circuit.

Formula:

D = Vout / Vin

where:

• Vout is the 14V output voltage
• Vin is the input voltage which can be from 100V to 240V

Output Resistor (R):

We used this to limit current and test safely first time.

Formula:

R = Vout / Iout

where:

• Vout is 14V
• Iout is 1A

So:

R = 14V / 1A = 14 ohm

Safety Things to Remember:

High voltage is dangerous so always follow safety rules.

Use safety tools like gloves, shoes and insulated tools.

Be careful and test circuit slow and in safe place.

Safety is always most important while building and testing the circuit

Conclusion:

With simple 14V SMPS circuit we can make adjustable 14V output from higher voltage input.

Even if we use easy formulas to choose basic parts and to make circuit safe and work good we will need more knowledge.

Things like feedback loop, picking right inductor and checking temperature are also important parts of this circuit.