A new control topology of single-stage HF link switch-mode rectifier with sinusoidal line current

Abstract

An optimized pulse-width modulation (PWM) control technique for a high-frequency (HF) link switch mode rectifier (SMR) is presented. The technique provides line current sinewave shaping and power factor correction while ensuring amplitude modulation (AM) of the HF square-wave voltage (or current) at the HF transformer primary side in a single power processing stage. A current-waveshaping control strategy that allows operation in the boosting and inverting stages while drawing a sinusoidal line current has been analyzed and experimentally tested. The control method allows operation at high switching frequencies of up to 70 kHz, which is higher than the inductor current ripple frequency. Experimental results from a 1.5 kVA unit that was set up in the laboratory using power MOSFET modules (50 A/450 V) show that operation at sinusoidal line current without waveform distortion at the vicinity of the zero crossing is possible.<>