Power converters and E-paper devices using the same for providing a plurality of voltages

A display device comprising:nan e-paper device for displaying information; anda power converter for generating a plurality of output voltages respectively at a plurality of output terminals and providing the output voltages to the e-paper device, wherein the power converter comprises:na transformer having a primary winding, at least one first secondary winding, and a second secondary winding;at least one first diode electrically connected between the primary winding and a first output terminal among the output terminals for generating the corresponding output voltage;at least one second diode electrically connected between a first terminal of the at least one first secondary winding and a second output terminal among the output terminals for generating the corresponding output voltage;a third diode having an anode terminal coupled to the second secondary winding and a cathode terminal coupled to a third output terminal among the output terminals, wherein a first terminal of the second secondary winding is directly connected to the anode terminal of the third diode, and a second terminal of the at least one first secondary winding is directly connected to the cathode terminal of the third diode;a control unit for detecting the output voltage at the first output terminal and providing a control signal according to the detected output voltage, andwherein the at least one first diode has an anode terminal coupled to the primary winding and a cathode terminal coupled to the first output terminal, and the second terminal of the second secondary winding is directly connected to the cathode terminal of the at least one first diode.

A power converter for generating a plurality of output voltages comprising:na plurality of output terminals for respectively providing the output voltages;a transformer having a primary winding, at least one first secondary winding, and a second secondary winding;at least one first diode electrically connected between the primary winding and a first output terminal among the output terminals for generating the corresponding output voltage; andat least one second diode electrically connected between a first terminal of the at least one first secondary winding and a second output terminal among the output terminals for generating the corresponding output voltage;a third diode having an anode terminal coupled to the second secondary winding and a cathode terminal coupled to a third output terminal among the output terminals, wherein a first terminal of the second secondary winding is directly connected to the anode terminal of the third diode, and a second terminal of the at least one first secondary winding is directly connected to the cathode terminal of the third diode;a control unit for detecting the output voltage at the first output terminal and providing a control signal according to the detected output voltage, andwherein the at least one first diode has an anode terminal coupled to the primary winding and a cathode terminal coupled to the first output terminal, and the second terminal of the second secondary winding is directly connected to the cathode terminal of the at least one first diode.