Multi-input DC converter and PFC circuit

摘要

The application discloses a multi-input DC converter and a PFC circuit. The multi-input DC converter of the application includes n diodes, a transformer, a switching transistor, a rectifier and filter circuit, and a load. The transformer includes a primary winding and a secondary winding, the number of turns of the primary winding is N1, and the primary winding is divided into n sections by leading out n−1 taps in a specific manner; anodes of the n diodes are respectively connected to n input sources in turn, cathodes of the n diodes are respectively connected to a first terminal of the primary winding and n−1 tap terminals in turn, a second terminal of the primary winding is grounded through the switching transistor, and the secondary winding delivers energy to the rectifier and filter circuit and then to the load. The structure is simple, and the cost is low.

主权项

1. A two-input DC converter, supplying power by using one or both of a first input source and a second input source; and comprising: a first diode, a second diode, a transformer, a switching transistor, a rectifier and filter circuit, and a load, wherein
the transformer comprises a primary winding and a secondary winding, the number of turns of the primary winding is N1, the primary winding is divided into a first section of winding and a second section of winding by leading out a tap, and the number of turns of the first section of winding and the number of turns of the second section of winding are determined according to the following two relations:V⁢⁢1V⁢⁢2=N⁢⁢11+N⁢⁢12N⁢⁢12,and N1=N11+N12, wherein, N11 represents the number of turns of the first section of winding which is between a first terminal of the primary winding and the tap, N12 represents the number of turns of the second section of winding which is between the tap and a second terminal of the primary winding, V1 represents a voltage value of the first input source, V2 represents a voltage value of the second input source, and V1>V2; and
an anode of the first diode is connected to the first input source and a cathode thereof is connected to the first terminal of the primary winding, an anode of the second diode is connected to the second input source and a cathode thereof is connected to the tap of the primary winding, the second terminal of the primary winding is grounded through the switching transistor, and the secondary winding delivers energy to the rectifier and filter circuit and then to the load.