# How Switched Mode Power Supply Works - SMPS - ATX

ATX Switched-Mode Power Supplies have some interesting features when compared to standard Switched Mode Power Supply (SMPS).

In the ATX power supply, there are different output voltages: + 12V, + 5V, + 3.3V, -12V, -5V and 5VSB. There are some variations on these types of Power Supply, but in the general context, the pattern is this.
The wayÂ SMPSÂ work is pretty much the same.
They control the output voltage by opening and closing the switching circuit so as to maintain the opening and closing time of this circuit, that is, the width of the pulses and their frequencies, to obtain the desired voltage.

There are separate processes for everything to work smoothly.
So let's see the modular diagram to unravel the steps of these processes so that we can step by step understanding.
This is the block in modules divided by steps, to improve our understanding.
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There areÂ 10 basicÂ steps to running anÂ ATX power supply, there are other underlying modules that are intrinsic in the steps, but, we'll not go as deep as it would be extremely great thisÂ Blogger, for those who want to watch the explanatory video with details in Portuguese. On the original post channel from YouTube.

### So let's understand these steps:

Step 1 - Transient Filter

Is through that stage that the voltage coming from your network, whether 110 or 220V AC should enter.
 Transient Filter

This voltage goes through basic protection, the fuse, that if some step ahead short, the fuse opens, avoiding to burst everything ahead, and in the same line, we have the NTCÂ (Negative Temperature Coefficient), It's a surge current limiter, in series with theÂ electric circuit,

In it the value of ohmic resistance decreases as its temperature rises, its initial resistance is approximatelyÂ 15 Ohms, which we can understand by theÂ Ohms' law, the advantages one has in using it in series after the power supply switches it on lowers its resistance to approximatelyÂ 0.5 Ohms.

EMI filtersÂ also exist, these are used to avoid high-frequency noise and a huge amount of harmonics generated by the switches that can propagate through the electrical network and cause interference in nearbyÂ electronic equipment.

### Step 2 - Primary Rectification

 Primary Rectification
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In this stage we find theÂ rectifier bridgeÂ or an arrangement formed by four commonÂ diodes, which has the function of rectifying a full-wave voltage, that is, rectifying an alternating electric current (AC), transforming it into a continuous electric current ( DC).

### Step 3 - Filtration

 Filtration
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After rectification, theÂ DCÂ signal,Â RipplesÂ (which are small variations, the capacitors are responsible for the filtering and stabilization IE, a decrease of theseÂ Ripples, in the rectified voltage, this voltage rises to something aroundÂ 300V, which are used in the power switches, this part is fundamental to the correct stabilization of the source especially if its source is ofÂ high power.

### Step 4 - Power Switches

 Power Switches
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These switches can beÂ BipolarÂ Power TransistorsÂ such asÂ MOSFETs, or any other type, but they differ from ordinary transistors, by the type of operation in which these transistors work, these switching transistors dissipate less power than a common working transistor in a linear source because they work as a switch on / off at high speeds, depending on the design of the source, they suffer variations that are usually betweenÂ 20KhzÂ toÂ 100kHz, they are directly responsible for the output voltage, and stability of that voltage, through of the commands received by theÂ Control Circuit.

### Step 5 - Output Transformer

 Output Transformer
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The transformer is a high-frequencyÂ CHOPPER TRANSFORMER, and they also work with alternating voltage, when passing through the switches the voltage will be a square waveÂ ACÂ type PWM, but with high frequency, not with the same frequency ofÂ 60HzÂ of the input voltage.

The switches work on two different levels, High and Low, when it is HIGH, the voltage goes through it normally, causing a constant voltage level in the input of the coil of the transformer, the action of these transistors, goes fromÂ HIGH to LOWÂ very quickly.

This will induce the winding to have the necessary voltages according to the winding and frequency placed on these switches.

### Step 6 - Fast Rectifier

 Fast Rectifier

With the voltage generated by high-frequency switches, a diode is needed to meet this demand, so we have theÂ high-speedÂ diodes calledÂ SCHOTTKY DIODESÂ or fast recovery diodes since ordinary diodes would not be able to work with high-frequency voltages.

### Step 7 - Output Filters

 Output Filters

The inductor - This has the function of eliminating the high-frequency harmonics so that they do not travel to the equipment that will be fed, imagine if these harmonics pass to a micro-controller for example, could cause undue loads and errors of reading in the control processes.

And theÂ CapacitorsÂ - They are the ones that filter andÂ stabilizeÂ the voltage at the output, avoiding ripples and instabilities at the output.

### Step 8 - Driver Transformer

 Driver Transformer
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TheÂ driver transformerÂ in this case is nothing less than the one responsible for traffic the information coming from the IntegratedÂ Circuit Controller, and pass these commands to the switches, so as to bring insulation or electrical decoupling between primary and secondary, in this topology there is a pair of transistors that also switch the Transformer Drive to receive theseÂ PWMÂ pulses from the driverÂ IC, passing this information to the power step we already saw inÂ Step 4.

### Step 9 - PWM control

 PWM control
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TheÂ brain of a switchedÂ source is itsÂ PWM controller, they are dedicatedÂ integrated circuits,Â to perform that work, but they do not work alone, there are also current sensors, which also vary from source to source, but it is very likely that you will find in its source theÂ TL341Â IC, it has the aspect of a transistor, but, it is not a transistor, it is very popular for its cost-benefit.

This circuit is connected to the output of the power supply, receivesÂ Feedback,Â and directs the voltage information to theÂ ICÂ that controls the oscillator that generates aÂ rectangular signalÂ whose pulse width is controlled and sent to the Transformer Drive that sends these commands to the step of power.

If the power at the output to raise the voltage tends to drop, the circuit activates the instantaneous correction in the pulse width of the switching transistors and the voltage keepsÂ stabilized.

### Step 10 â€“ Primary Power Supply VSB

 Primary Power Supply VSB
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VSBÂ stands for Voltage Standby, which is technically a power supply that keeps its output active, whenever the source power cord is connected to the mains, its capacity is approximatelyÂ 2 Amps,Â and this depends on the total power of the source, this active voltage line is to keep the circuit active and is necessary for when the power on button is activated throughÂ PSON, which is the start of the power supply, then the oscillator will activate the power line also powers the motherboard hardware to activate peripherals via software, keyboard, network, and so on.

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

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