POWER CONVERTER PROVIDING DESIRED OUTPUT WAVEFORM

摘要

A power converter (2700) produces an output signal having a desired voltage waveform (2800) from a rectified signal (+135). The poser converter includes a converter and a controller. The converter includes first and second juncture nodes (2703, 2707) for receiving the rectified signal therebetween; first and second converter output terminals (L1, L2); first, second, third, and fourth switches (2702, 2704, 2706, 2708) for selectively effecting current paths (e.g. 3000) between the first juncture node and one of the first and second converter output terminals and between the second juncture node and the other of the first and second converter output terminals; and a capacitance (2902) in series with a fifth switch (2908). The fifth switch is shunted by a diode (2906). The diode conducts a charging current for the capacitance, whereas the fifth switch conducts a discharging current for the capacitance. The capacitance and the fifth switch in series are coupled across the first and second juncture nodes. The controller provides a plurality of operative control signals to the first, second, third, fourth, and fifth switches to create the output signal at the converter output terminals having the desired voltage waveform. The discharging current provides a portion (T3-T4) of the desired voltage waveform.