V. UTILIZATION IN DEDICATED APPLICATIONS
TARGETING HIGHEST EFFICIENCY
As was mentioned in the introduction of this paper, different practical applications are requiring utilization of different circuit topology, in which projection and selection of proper components are performing the most important challenge at gaining of optimal ratio between performance and cost [6] [7] [8] [9] [10]. The utilization of selected diodes was done in proposed PFC and LLC converters, whereby influence of diode behavior on the efficiency of converter has been discovering.
H. Investigation of performance in the case of LLC converter
The LLC converter became very popular solution of SMPS almost in every industrial and consumer area. The main parameters of proposed LLC converter are:
- input voltage: 320 Vdc - 400 Vdc
- output voltage: 24 Vdc
- output power: 450 W
- switching frequency (resonant): 100 kHz
Diodes which hava been selected for investigation were: - LAQ12T300C, MBR20200CT, SDT10S30
That means, that each of the structure (standard Schottky, Qspeed, and SiC) have undergone experiments, which have been provided in the way of evaluation of efficiency in the whole range of power loading of proposed converter, at nominal value of input voltage (400 Vdc).
Next figure (fig.10) is showing waveforms of efficiency in dependency on output power. The measurements were provided for each diode at 25 ºC.