Overview: 0 Introduction With the development of power electronics technology, non-linear loads such as rectifiers and switching power supplies in the power grid continue to increase. These impactful electrical equipment will cause serious distortion of the input current on the grid side, resulting in a large amount of harmonic pollution, resulting in a low power factor of the grid, so it is imperative to increase the power factor. 1 APFC circuit topology
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In order to achieve the purpose of power factor correction (PFC), this paper proposes a single-cycle control scheme based on bridgeless APFC circuit. This scheme uses a single-cycle control method to control the switching transistor of the switching converter to track the AC input current waveform. The voltage waveform is input to sinusoidalize the AC current waveform. The Matlab software is used to simulate the designed circuit. The experimental results show that the single-cycle controlled bridgeless power factor correction circuit has a good correction effect, and the circuit has fewer switching devices, low power consumption, small circuit size and simple control circuit. The advantages.
Early power factor correction was achieved by adding a filter inductor and capacitor after the rectifier. The power factor was generally only about 0.6. In the 1990s, active power factor correction (APFC) was generated by connecting a DC/DC switch between the rectifier and the load. The basic principle of the converter is to force the AC input current waveform to track the AC input voltage waveform through the control circuit, thereby realizing the sinusoidal of the AC current waveform and synchronizing with the AC input voltage waveform, the power factor can be increased to above 0.99.
1.1 Traditional Bridged APFC Topology The traditional Boost APFC circuit consists of a rectifier bridge and a PFC, as shown in Figure 1. There are three semiconductor jobs in the flow path during operation, and the power factor is low. When the converter power and switching frequency increase, the system on-state loss increases significantly, the overall efficiency is low, and the control circuit is more complicated. 
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September 11, 2022