I. INTRODUCTION
In most of practical applications of power electronics losses caused by diode’s turn – off process forms significant part of total losses of power semiconductor system. The goal of every power semiconductor system design is approach to the highest efficiency with respect to maximum output power. However, 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 power. Almost all Switched – Mode Power Supplies (SMPS) are nowadays being developed in cooperation with a power factor correction (PFC) input
stage in order to meet the international regulatory standards for harmonic content[1].
Together with the development in the field of switched model power supplies, the practical use of resonant topologies is being more and more significant. Current tendencies are characterized by continuous increase of efficiency (reducing switching losses) and increase of power density (decreasing volume). The LLC resonant converter is nowadays a very popular solution for most of consumer and/or industrial applications.
Altogether with previous description the performance in dependency on cost is almost very important and mostly limiting factor for innovative practical designs. Due to that, we have provided research of dynamic properties of most perspective diode structures which are nowadays available for practical use in PFC and LLC converter circuits.
In the first part of this paper, the description of SiC and Qspeed structures is made. After that, the investigation of dynamic properties of selected diode in dependency on various circuit parameter in hard switching mode is being shown. Finally utilization of selected diodes in proposed PFC and LLC converter is made, whereby influence of diode on the efficiency of converter was discovered
I. INTRODUCTION In most of practical applications of power electronics losses caused by diode’s turn – off process forms significant part of total losses of power semiconductor system. The goal of every power semiconductor system design is approach to the highest efficiency with respect to maximum output power. However, 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 power. Almost all Switched – Mode Power Supplies (SMPS) are nowadays being developed in cooperation with a power factor correction (PFC) input stage in order to meet the international regulatory standards for harmonic content[1].Together with the development in the field of switched model power supplies, the practical use of resonant topologies is being more and more significant. Current tendencies are characterized by continuous increase of efficiency (reducing switching losses) and increase of power density (decreasing volume). The LLC resonant converter is nowadays a very popular solution for most of consumer and/or industrial applications.Altogether with previous description the performance in dependency on cost is almost very important and mostly limiting factor for innovative practical designs. Due to that, we have provided research of dynamic properties of most perspective diode structures which are nowadays available for practical use in PFC and LLC converter circuits.
In the first part of this paper, the description of SiC and Qspeed structures is made. After that, the investigation of dynamic properties of selected diode in dependency on various circuit parameter in hard switching mode is being shown. Finally utilization of selected diodes in proposed PFC and LLC converter is made, whereby influence of diode on the efficiency of converter was discovered
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I. INTRODUCTION
In most of practical applications of power electronics losses caused by diode’s turn – off process forms significant part of total losses of power semiconductor system. The goal of every power semiconductor system design is approach to the highest efficiency with respect to maximum output power. However, 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 power. Almost all Switched – Mode Power Supplies (SMPS) are nowadays being developed in cooperation with a power factor correction (PFC) input
stage in order to meet the international regulatory standards for harmonic content[1].
Together with the development in the field of switched model power supplies, the practical use of resonant topologies is being more and more significant. Current tendencies are characterized by continuous increase of efficiency (reducing switching losses) and increase of power density (decreasing volume). The LLC resonant converter is nowadays a very popular solution for most of consumer and/or industrial applications.
Altogether with previous description the performance in dependency on cost is almost very important and mostly limiting factor for innovative practical designs. Due to that, we have provided research of dynamic properties of most perspective diode structures which are nowadays available for practical use in PFC and LLC converter circuits.
In the first part of this paper, the description of SiC and Qspeed structures is made. After that, the investigation of dynamic properties of selected diode in dependency on various circuit parameter in hard switching mode is being shown. Finally utilization of selected diodes in proposed PFC and LLC converter is made, whereby influence of diode on the efficiency of converter was discovered
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