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PFC Control Theory
Figure
2.2.3 Digital Power Factor Concept — Discontinuous Conduction Mode
The control technique is based on discontinuous conduction mode with a current loop with a constant switching frequency (40 kHz) (see Figure
The basic principles of the scheme are depicted in Figure
The desired shape of the input current is a sine wave. The generated current waveform is shown in Figure
The discontinuous conduction mode PFC concept has several drawbacks — higher THD than hysteresis current control mode, non sinusoidal input current waveform, and the discontinuous conduction mode itself. The input current harmonics content, however, complies with EN
The advantages are a simple control circuit, with low MCU resource consumption, and low losses.
Dimmable Light Ballast with Power Factor Correction, Rev. 1
Freescale Semiconductor | 17 |