Читать книгу Soft-Switching Technology for Three-phase Power Electronics Converters - Rui Li - Страница 26

To reduce charging time of EV, power rating of EV chargers is becoming large and large. The EV charger shown in Figure 1.27 is composed of two power conversion stages. To increase power density of the charger, soft‐switching technique is used. The first stage is three‐phase rectifier where an auxiliary resonant circuit is introduced to realize soft‐switching for the rectifier. For the second stage, double inductors and one capacitor (LLC) resonant DC/DC converter is used. It can realize soft‐switching for all switches in the DC/DC converter. All switches in EV charger can realize soft‐switching so that its power density is enhanced.

Figure 1.26 High speed drives with auxiliary resonance circuit.

Figure 1.27 Soft‐switching EV charger.