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Input characteristics of L-filtered pulse-width-modulation (PWM) converter with one-cycle-control (OCC) method was analyzed, and the contradiction between decreasing phase displacement angle and decreasing input current ripple was revealed when the maximum switching frequency was limited to ensure high system efficiency. Given this, LCL-filtering scheme was introduced and used on OCC PWM converter,...
The influence on input current harmonics by single-edge modulation of conventional one-cycle control (OCC) in single-phase PFC converters is analyzed. The relation between low-frequency odd harmonics of the inductor current and modulation scheme is revealed. Based on the analysis, bi-edge modulation with triangular-wave as carrier is proposed. The inductor current is modulated both at leading- and...
A new equivalent input circuit of one-cycle-controlled (OCC)PFC converter is built, based on which, the current phase lag issue especially outstanding at low ratio of switching frequency to line frequency is analyzed, and a novel current phase lag compensation scheme by controlling the voltage across the switch is proposed to reduce the phase lag of line current relative to line voltage. Implementation...
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