How does a switch-mode power supply work?

In switching power supply designs, the input voltage is no longer reduced; instead, it’s rectified and filtered at the input. Then the voltage goes through a chopper, which converts it into a high-frequency pulse train. Before the voltage reaches the output, it’s filtered and rectified once again.

What are components of SMPS?

A basic isolated AC to DC switched-mode power supply consists of:

  • Input rectifier and filter.
  • Inverter consisting of switching devices such as MOSFETs.
  • Transformer.
  • Output rectifier and filter.
  • Feedback and control circuit.

What are the main 5 blocks of switched-mode power supply?

The major components that constitute SMPS are as follows:

  • Input rectifier and Filter (Diode rectifier and capacitor filter)
  • High-frequency switch (Power transistor or MOSFET)
  • Power transformer.
  • Output rectifier and Filter (Diode rectifier and capacitor filter)
  • Control circuit (comparator and pulse width modulator)

What are the design principles of SMPS?

The following SMPS design assumes that the components are ideal – transistor and diode voltage drops are zero, inductor and capacitor are ideal (no parasitics). There are no losses in the circuitry – power supplied by the source equals the power delivered to the load.

What are the main 5 blocks of Switched Mode Power Supply?

What are the components of SMPS?

While there are many components involved in SMPS, a handful of critical devices include:

  • Capacitors. Capacitors perform energy storage, filtering, compensation and soft-start programming.
  • PTC Thermistors.
  • Varistors.
  • EMC and Transient Protection.
  • High-performance and Compact Inductors.

What is the ground terminal on a power supply?

It’s connected to the ground pin in the mains plug. The power supply is floating, so if you want a grounded supply, you connect either the positive or the negative output terminal to this terminal, depending on whether you want the voltage to be positive and negative relative to ground.