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A LLC resonant converter is a converter, which achieves Buck or Boost gain with Pulse Frequency Modulation, and it is a suitable topology for high power density. This LLC resonant converter has many advantages, such as wide soft-switching range, high switching frequency capability, and low voltage stress of active devices, however, it also has large RMS current and circulating current. From these...
A zero-voltage-switching (ZVS) bridgeless power factor correction (PFC) boost converter to reduce switching losses is proposed in this paper. Based on the conventional dual boost bridgeless converter, an auxiliary circuit including another main switch on the opposite side is added in the proposed converter to perform ZVS in man switches. Moreover, ZCS of auxiliary switches can also be achieved. As...
In low-to-mid power supplies, a critical mode (CRM) boost power factor corrector (PFC) converter is a popular topology due to its simple control and no reverse recovery problem. In a CRM boost PFC, the poor power factor due to phase leading input current (PLIC) by input capacitor (Cin) has been pointed out. There has been an effort to compensate PLIC in a CRM boost PFC by digital control. However,...
Bidirectional bridgeless PFC is an advantageous topology for high power application among many bridgeless PFCs due to small EMI filter size and no reverse recovery problem. However due to the large junction capacitance of secondary leg's diodes, the dead angle is shown in the zero-crossing area. Thus, the input current distortion is intensified, and the unnecessary switching loss decreases the efficiency...
A new asymmetric half-bridge (HB) resonant converter for DC/DC power system with a low and wide input voltage is proposed in this paper. The proposed converter is based on the switch integration technique, merging the Active-Clamp Forward (ACF) circuit and the HB LLC resonant converter. By adopting the ACF circuit in front of the HB LLC resonant converter, higher input voltage of LLC resonant converter...
In general, the LLC series resonant converter (LLC SRC) is an attractive topology for the applications which require the wide input variation and high efficiency especially at light load condition. This is because of its wide gain capability with pulse-frequency modulation and zero-voltage-switching over the entire load condition. However, there is a regulation problem that the output voltage increases...
In this paper, a new wide range zero-voltage switching asymmetric half-bridge (AHB) converter with clamping switches for small DC offset current is proposed. Since the hold-up time requirement makes the conventional AHB converter operates asymmetrically in nominal state, a large DC offset current degrades the performance of AHB converters. In order to overcome this problem, the proposed AHB converter...
In low-to-mid power applications, a critical conduction mode (CRM) boost power factor corrector (PFC) is widely used due to its simple control and a reduced switching loss. One of the important characteristics of CRM boost PFC is that the switching frequency is not constant and the range of variation is wide. Due to this variability of the switching frequency, there is a design guideline, which must...
In this paper, a half-bridge (HB) LLC resonant converter which has been used for server power supply, is controlled by digital controller. In order to increase the entire load efficiency of HB LLC converter, a synchronous rectifier (SR) should has a robust control at any condition such as PFC noise or the lack of current sensing. For these reason, digital controller with LLC SR control is preferred...
The phase-shifted full bridge (PSFB) converter is widely used in the middle and high power applications such as a server power system. However, due to the newly required trend for high light-load efficiency, the PSFB converter has a limitation for light-load efficiency because of a large circulating current, core losses of the transformer and inductors, and the insufficiency ZVS energy of lagging-leg...
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