Abstract
The principles and operating characteristics of bridgeless rectifiers under different power factors are discussed with emphasis on analyzing the input current distortion. Firstly, two driving modes are analyzed and compared. Based on the results of comparison it is concluded that the complementary drive mode is a better choice in terms of reducing the current distortion when bridgeless rectifier operates on non-unity power factor. Then, the mechanism causing input current zero-crossing distortion is analyzed. The input current during the distortion is expressed by the piecewise function when a bridgeless rectifier operates under complementary drive mode. Based on the piecewise function, the harmonic analysis is performed. Besides, the relationships between the input current Total Harmonic Distortion (THD) and the filtering inductance, the input current amplitude and the power factor angle are also investigated, which is useful when designing bridgeless rectifiers and selecting the corresponding parameters. Finally, the accuracy of the theoretical analysis is verified through the simulation and experiment.
Highlights
Devices based on full-control Pulse Width Modulation (PWM) converter technology have been widely used to solve power quality problems, such as harmonic and reactive power contamination, which is caused by certain power electronic devices
In order to more effectively integrate the reactive power compensation (RPC) and harmonic current compensation (HCC) capabilities into the bridgeless rectifier, the input current harmonic characteristic of bridgeless rectifier under different power factors in two the input current harmonic characteristic of bridgeless rectifier under different power factors in two driving modes is discussed in this paper
Based on the above analysis, it is concluded that the complementary drive mode is a better choice in terms of reducing analysis, it is concluded that the complementary drive mode is a better choice in terms of reducing the current distortion when bridgeless rectifier operates under non-unity power factor
Summary
Devices based on full-control Pulse Width Modulation (PWM) converter technology have been widely used to solve power quality problems, such as harmonic and reactive power contamination, which is caused by certain power electronic devices. A detailed theoretical analysis the current distortion was factors not carried the ability of of bridgeless rectifiers operating underofleading or lagging power was out, not and mentioned. We concluded the complementary drive mode is better choice in are terms of reducing the current distortion whenthat bridgeless rectifiers operate under nona better choice in terms of reducing the current distortion when bridgeless rectifiers operate under unity power factors. This analysis is helpful for the design of bridgeless rectifiers and the non-unityofpower factors.
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