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Download based discontinuous conduction mode (DCM) detection technique
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Transcript
Digital DCM Detection and Mixed Conduction Mode Control for Boost PFC Converters ABSTRACT This paper presents a control technique and DSP-PIC based DCM detection method to provide simple MCM control of the boost PFC converter. By using integrated high-speed comparators so the need for a costly auxiliary winding to detect zero inductor current is eliminated, as well as providing detection of DCM operation without knowledge of the power converter component values. This paper presents a novel mixed conduction mode (MCM) digital controller with a digital signal processor (DSP-PIC) based discontinuous conduction mode (DCM) detection technique to realize total harmonic distortion (THD) and power factor improvements in boost power factor correction (PFC) converters operating in both continuous conduction mode (CCM) and DCM during a single ac line half-cycle. By using DSP-PIC simple and cost-reductions over existing DCM and zero-current detection methods are made possible. Additionally, performance improvements over a conventional CCM digital control technique are possible with simple software modification, and can be extended to existing boost PFC converter designs provided a compatible DSP-PIC is present. Existing System Digital feed forward control. MCM boost converter by using an auxiliary winding. Voltage comparator to measure the length of the DCM period. Drawbacks of Existing System Need of auxiliary windings to detect zero inductor current. Need more cost to install an additional winding to the boost inductor. Feedforward control technique is the need for comparison and computation of two separate feedforward terms. Required more components. Proposed System DSP PIC-based DCM detection method to provide MCM control of the boost PFC converter. Advantages of Proposed System It can detect DCM without knowledge of the power converter component values. The need for a costly auxiliary winding to detect zero inductor current is eliminated. It consists of high speed comparators. The proposed control method requires only simple modification to existing control software. Total Harmonic distortion is reduced. Applications Constant frequency control. This technique is applicable for any converter operating in DCM including power factor correctors (PFC). The DSP PIC-based control can achieve a power factor higher than 0.99 in the entire line range. Applicable for a flyback converter operating in discontinuous conduction mode (DCM). DC-DC Buck-Boost converter.