High Power Factor Converter for Motor Drivers and Power Supplies

摘要

The high power factor converter 50 is intended for use in motor drivers and power supplies. The first and " buck " type transducer section 62 is a. And is connected to a voltage source. This section provides an output voltage with preselected voltage characteristics. This section operates during the portion of the input voltage cycle where the input voltage level exceeds the output voltage level. The second and " boost " type transducer section 70 is also connected to a voltage source. This second section also operates during the portion of the input voltage cycle that provides the output voltage and the output voltage level exceeds the input voltage level. The control circuit 66 is responsive to the relative levels of the input and output voltages to cause the converter operation to switch between the two converter sections with the action of the sensed actual output voltage being compared to the pre-. This allows the transducer to maintain a high power factor for nearly any conduction angle and any output voltage level in the range of voltage levels above the peak input voltage level from zero volts.