In order to save energy, including Energy Star, save the climate, and more than 80 other plans related to computing power, off-line AC-DC power converters with power factor correction (PFC) are required. , to play a higher efficiency. This paper will evaluate the PFC topology in terms of both theory and practice, allowing designers to choose the most suitable topology based on system requirements.
In order to save energy, some public utilities companies and environmental agencies have developed a number of programs and incentive programs that are expected to make off-line AC-to-DC (AC-DC) power converters more efficient. To reduce the loss of wire transmission, these companies and organizations require off-line converters with power factor correction (PFC). These include Energy Star, Climate Savers, and more than 80 other plans related to computing power. These plans are similar in nature and require off-line power converters to achieve efficiencies of more than 80% when the load is increased from 20% to 100%, while requiring a power factor of 0.9 or higher at full load.
In order to meet these power factor requirements, designers must import a PFC pre-regulator. Two innovative PFC control topologies have been developed to increase the efficiency of PFC controllers. The first topology is a semi-bridgeless PFC that reduces the loss of half of the bridge rectifier; the second topology is an interleaved PFC that reduces converter I2R losses by up to 50%. Both technologies require two boost power stages to increase efficiency, so designers often have to choose between these two topologies. In order to clarify this issue, the following two aspects will be evaluated in terms of both theory and practice, allowing power supply designers to select the most suitable topology based on system requirements.
Semi-bridgeless PFC efficiency / inductor size is difficult to achieve
Figure 1 shows the circuit topology of a semi-bridgeless PFC pre-rectifier. This topology must be paired with two boost power stages (Boost1 and Boost2) to implement the PFC, and the boost inductor is directly connected to the input of the converter. This topology also requires full-wave rectifiers (DA, DB, DC, and DD) to allow the general PFC boost capacitor (CBOOST) to reach its maximum charge during the initial power-on time. However, after the boost capacitor has reached the highest charge and the converter starts operating, only one rectifier diode (DA or DB) is active during each diode bridge conduction, unlike in full bridge. In a topology, there are typically two diodes that conduct simultaneously. This is quite different from traditional PFC boosting with two bridge rectifier diodes. This innovative technology eliminates the conduction losses generated by a rectifier diode and increases efficiency, which in turn increases overall system efficiency.
Figure 1 Semi-bridgeless PFC pre-rectifier and its circuit topology
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