What does LLC stand for converter?

This unique combination of two inductors and one capacitor (“L-L-C”), offers a relatively narrow range of switching frequencies, which are much easier to design a standard EMI filter for, combined with the capability of producing zero-voltage switching (soft-switching) through careful design which can significantly …

What is LLC in power supply?

LLC, of course, refers to the use of two inductances (L) and a capacitor (C). This combination establishes resonance at the switching frequency. As a result, the switching transistors see a sine wave and are enabled to switch at the zero-crossing points or near zero.

Why does an LLC need a resonant converter?

LCC resonant converter is composed of two capacitors and a resonant inductor. LCC resonant converter is able to achieve wide operation together with high efficiency . Due to low switching losses, LCC resonant converter is able to operate at high switching frequencies, while maintaining high efficiency.

How does an LLC resonant converter work?

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 load resonant converter?

Description. The Series Load Resonant converter is a DC/DC converter based on a resonant circuit which allows soft-switching operation. In a soft-switching converter, switching occurs when voltage and/or current values are zero, thus significantly improving converter’s efficiency.

What is meant by resonant converter?

A resonant converter is a type of electric power converter that contains a network of inductors and capacitors called a “resonant tank”, tuned to resonate at a specific frequency. They find applications in electronics, in integrated circuits.

What is LLC topology?

An LLC power stage is sown in Figure 2.1. The circuit has two full bridge circuits separated by an isolation transformer. The transformer ratio is set for nominal operating voltage. The resonant tank gain is function of resonant elements (Lm, Lr and Cr), load and switching frequency.

What are the advantages of resonant converter?

Abstract: Owing to the advantages of high efficiency, high energy density, electrical isolation, low electromagnetic interference (EMI) and harmonic pollution, magnetic integration, wide output ranges, low voltage stress, and high operation frequency, the LLC resonant converters are widely used in various sectors of …

What is full bridge LLC resonant converter?

ABSTRACT A full-bridge LLC resonant converter with series-parallel connected transformers for an onboard battery charger of electric vehicles is proposed, which can realize zero voltage switching turn-on of power switches and zero current switching turn-off of rectifier diodes.

What is ZVS and ZCS?

ZVS eliminates the capacitive turn-on loss. ZCS operates with constant on-time control, while ZVS operates with constant off-time control. With a wide input and load range, both techniques have to operate with a wide switching frequency range, making it not easy to design resonant converters optimally.

What is ZVS resonant converter?

2.2 Resonant Switch Converters. 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.

What is series resonant inverter?

Resonant inverters are electrical inverters based on resonant current oscillation. In series resonant inverters the resonating components and switching device are placed in series with the load to form an underdamped circuit. If the switching element is a thyristor, it is said to be self-commutated.