Power Electronics Resonant Switching - Power Electronics

What is Resonant Switching in Power Electronics?

In power electronics, resonant switch converters are the converters which have inductor and capacitor (L-C) networks and who’s current and voltage waveforms differ in a sinusoidal manner at the time of period switching. There are several resonant switch converters

  • Resonant DC to DC converters
  • DC to AC inverters
  • Resonant AC inverters to DC converters

In this tutorial, we will discuss Resonant DC to DC converters

Resonant DC to DC Converters

Switch mode power supply (SMPS) concept is described below by using a DC to DC converter. Load will be given as constant voltage supply (VOUT) which is attained from a primary source of voltage supply VIN. The value of VOUT can be controlled by an unreliable resistor in series (RS) or the current source which is connected in shunt (IS). By restricting VOUT through varying IS and making sure that RS is kept steady, a substantial amount of power will be lost in the converter.


Switched Mode Power Supply (SMPS)

An SMPS (switched mode power supply) is an electronic device which makes use of a switching regulator to convert electrical power in a well-organized manner. SMPS will take power from the main power lines and it will transfer that to a load. For example, a computer makes sure that the voltage and current characteristics are converted.

The differentiation between an SMPS and a linear supply of power is that the previous one will keep switching ON and OFF throughout the low dissipation and utilizes a smaller amount time during high dissipation regions. This will make sure that less energy is wasted. In fact, SMPS will not dissipate any power.

SMPS size is smaller and very light when compared to a normal linear supply power device of the same size and shape.


Below figure displays the circuit diagram for an SMPS. When the switching frequency varies, the stored energy will vary for every cycle and therefore the voltage output will also vary.


Below waveforms are for a half bridge converter which are also called as a push-pull. They are used in applications which need high power. Input voltage is halved as shown in the waveform below.


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