The SMPS or Switched Mode Power Supply electronic circuit converts power either with the use of switching devices that turn on/off at high-frequencies or with the help of inductors or capacitors to supply power when the switching device is in a non- conduction state.

SMPS power supply is widely used in electronic equipment namely computers and several other devices that need an efficient and stable power supply. Besides overall performance, SMPS has plenty of advantages that range from its size, cost, weight to efficiency.

Simply put, the SMPS circuit converts and regulates energy with power semiconductors that are switched on/off with high-frequency.

Complete List of Different Types of SMPS (Switched Mode Power Supply) Available in the Market

These are some of the well known and most commonly used Switched Mode Power Supply for end customers.

#1) DC-DC Converter

The power received from AC mains is rectified and filtered as a high-voltage DC. This high DC voltage is then switched and fed to the step-down transformer at the primary side. At the secondary side of the step-down transformer, the rectified and filtered output is collected which is ultimately sent as the output to the power supply.

#2) Forward Converter

Irrespective of if the transistor is conducting or not the choke carries the current in the forward converter. The diode inside the transistor carries the current during the OFF period to support the energy flow through the load. During the On period, the choke stores the energy and also passes a part of the energy to the output load.

#3) Flyback Converter

In a Flyback converter, during the On period of the switch magnetic field of the inductor stores energy. When the switch is in the open state the energy is emptied into the output voltage circuit. The Duty cycle in the Flyback converter is determined by the output voltage.

#4) Self-oscillating Flyback Converter

It is based on the Flyback principle. During conduction, a current through the transformer primary starts to ramp up linearly with the slope Vin/Lp. Due to the voltage induced in the feedback winding and the secondary winding, the fast recovery rectifier starts to operate in reverse biased and hold the conducting transistor ON. The core begins to saturate once the current reaches its peak value. The result is a sharp rise in current is not supported by the fixed base drive supported by feedback windings. Hence, the switching begins to come out of saturation.

Advantages Of SMPS (Switched Mode Power Supply) Circuit

• Highly-efficient with lower levels of energy being dissipated as heat.
• Useful in voltage step up and step down applications as they provide with high-efficiency voltage conversions.

SMPS circuits are employed in various applications which include computers, servers and other types of equipment. They have their importance in domestic, security or at commercial places.