How does a resonant converter work?

A regular LLC resonant half bridge converter works a combination mode of a voltage divider and amplifier of resonant inductor voltage of the resonant tank. At the resonant frequency, impedance of resonant tank is zero, which means the input voltage is 100% applied on the load.

What is the principle of resonant converters?

In application, LLC resonant converter works around the frequency of resonant tank (formed by Lr, Cr). Due to the nature of LC filter, only the fundamental frequency of the input voltage can pass through the filter. All the harmonics are filtered by the resonant tank.

What is the need for resonant converters?

Resonant topologies are typically applied when low EMI is needed or when the switching losses have to be reduced in order to allow higher frequencies for miniaturization. In addition, resonant operation enables high frequency power transfer via a transformer [7].

What is soft switching in converters?

The terms “hard switching” and “soft switching” refer to the methods of switching based on the relationship of current and voltage during the turn-on and turn-off of the IGBT. Soft switching helps reduce the switching noise and loss because switching devices turn on and off at zero or nearly zero voltage or current.

Why do we use resonant converter?

What is a resonant inductor in a ZCS converter?

Typically in ZCS converters a resonant inductor which is placed in series with the semiconductor switch, is used to resonant the current through the switch to zero at turn-off and limit di/dt for turn-on.

What is resonance capacitor in ZVS converter?

Typically in ZVS converters a resonance capacitor which is placed in parallel with the semiconductor switch, is used to resonant the voltage across the switch to zero at turn-on. The two basic quasi-resonant and multiresonant topologies are shown in Figs. 7.54 and 7.55, respectively. Figure 7.54.

Why resonant and quasi-resonant power conversion technology?

Introduction Advances in resonant and quasi-resonant power conversion technology propose alterna- tive solutions to a conflicting set of square wave conversion design goals; obtaining high efficiency operation at a high switching fre- quency from a high voltage source.

What is zero voltage switching?

Zero Voltage Switching Overview Zero voltage switching can best be defined as conventional square wave power conversion during the switch’s on-time with “resonant” switching transitions.