High Power Factor Converters for Motor Drivers and Power Supplies

摘要

The high power factor converter 50 is for use in motor drivers and power supplies. The first and " buck " type transducer sections 62 are a.c. Connected to a voltage source. This section provides output voltages 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 converter section 70 is also connected to a voltage source. This second section also provides an output voltage and operates during the portion of the input voltage cycle where the output voltage level exceeds the input voltage level. The control circuit 66 converts the first and second converter sections based on time division in which the converter operation is switched between the two converter sections in response to the detected actual output voltage in response to the relative levels of the input and output voltages. To work. This allows the converter to maintain a high power factor for almost any conduction angle and any output voltage level in the voltage level range from zero volts above the peak input voltage level.