Abstract
This paper is concerned with the derivation of a discontinuous conduction mode boost PFC rectifier as a driver for high-power LED lighting applications. The proposed driver is operated in the current mode regime while emulating a resistance towards the line, thus attaining a near unity power factor and low total harmonic distortion of the line current. Theoretical analysis is reported and conditions for the low LED flicker are derived. A method of design for minimum THD is also suggested. Simulation and experimental results are reported.
Highlights
one cycle control (OCC)-controlled discontinuous conduction mode (DCM) boost power factor correction (PFC) rectifier [19] relied on sensing both the rectified input and the output voltages to generate the required duty cycle
The OCC DCM boost PFC operates under two feedback loops
total harmonic distortion (THD) performance of the proposed PFC rectifier/light-emitting diodes (LEDs) driver depends primarily on three factors: the accuracy of the current sensing network averaging performance, the accuracy of duty cycle generation by the OCC modulator, and the propagation of the second harmonic ripple within the control loop
Summary
OCC-controlled DCM boost PFC rectifier [19] relied on sensing both the rectified input and the output voltages to generate the required duty cycle (see Figure 1a). Unlike the earlier voltage feed-forward DCM OCC approach, the proposed OCC controller in Figure 1b relies on sensing the inductor current to generate the duty cycle for the DCM boost PFC power stage. This is derived and its key features are studied.
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