Power converters for multiple input power supplies
First Claim
1. A converter for transferring power from a power source to a primary winding of an output transformer providing power to a load, the converter comprising,a charging means for storing energy during a charging time,a charging switch means for providing a short circuit path for controlling the charging of the charging means,a blocking means connected between the charging means and the primary winding, the blocking means is for blocking the short circuit path to the primary winding during the charging time, the blocking means provides high impedance to the primary winding during the charging time to prevent short circuit path coupling to the primary winding during the charging time, anda discharging switch means for controlling the discharging of the charging means during a discharging time, the charging means discharges energy through the primary winding and through the discharging switch means during the discharging time, the discharged energy in the primary winding is coupled through the output transformer to the load to transfer power to the load.
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Accused Products
Abstract
An improved power converter employs two conventional charging and discharging switches operating in a complimentary mode and driven by a switch driver controlled by a power factor correction controller. The power converter is firstly improved with a blocking diode for blocking cross coupled short circuit paths to enable multiple converters to drive respective primary windings of an output isolation transformer, and is further modified with an absorption capacitor for providing a discharge path for a switching capacitor connected across the discharging switch so as to enable zero voltage switching of the discharging switch while employing conventional power factor correction, over voltage protection and current limiting. A plurality of improved power converters can be connected between respective input power sources and respective primary windings of the transformer with each converter independently providing power factor correction without cross coupling short circuit paths.
30 Citations
17 Claims
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1. A converter for transferring power from a power source to a primary winding of an output transformer providing power to a load, the converter comprising,
a charging means for storing energy during a charging time, a charging switch means for providing a short circuit path for controlling the charging of the charging means, a blocking means connected between the charging means and the primary winding, the blocking means is for blocking the short circuit path to the primary winding during the charging time, the blocking means provides high impedance to the primary winding during the charging time to prevent short circuit path coupling to the primary winding during the charging time, and a discharging switch means for controlling the discharging of the charging means during a discharging time, the charging means discharges energy through the primary winding and through the discharging switch means during the discharging time, the discharged energy in the primary winding is coupled through the output transformer to the load to transfer power to the load.
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8. A power system for transferring power from a plurality of power sources to a load, the power system comprising,
a transformer having a respective plurality of primary windings and a secondary winding connected to the load, a plurality of converters respectively connected between the primary windings and the power sources, each converter further comprises: - a charging means for storing energy during a charging time;
a charging switch means for providing a short circuit path for controlling the charging of the charging means;
a blocking means connected between the charging means and the respective primary winding, the blocking means is for blocking the short circuit path to the respective primary winding during the charging time; and
a discharging switch means for controlling the discharging of the charging means during a discharging time, the charging means discharges energy through the respective primary winding and through the discharging switch means during the discharging time to couple power from a respective one of the power sources to the load, anda plurality of respective switch drivers operating the charging switch means and the discharging switch means in a complimentary mode providing open and closed conditions, the charging switching means is closed and the discharging switching means is opened during the charging time, the charging switching means is opened and the discharging switching means is closed during the discharging time, and, the discharged energy in the primary winding is coupled through the output transformer to the load to transfer power to the load. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
- a charging means for storing energy during a charging time;
Specification