Output voltage feedback circuit and temperature compensation circuit of switching converter

• Main Authors: WANG XIAOLIANG, LIANG YUZHENG, JIN RUOYU
• Format: Patent
• Language: Chinese; English
• Published: 04.12.2018
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention provides an output voltage feedback circuit of a switching converter. The output voltage feedback circuit comprises a diode D5 and a Zener diode ZD1;an anode of the diode D5 is connectedwith a positive terminal of the output voltage, and an anode of the Zener diode ZD1 is used as an output end of the output voltage feedback circuit and is used to be connected with an FB pin of a control chip; a temperature compensation circuit is included; the temperature compensation circuit includes a compensation device complementary to the temperature variation characteristic of the Zener diode ZD1; and the temperature compensation circuit is serially connected between the diode D5 and the Zener diode ZD1, i.e., one end of the temperature compensation circuit is connected to a cathode ofthe diode D5, and the other end of the temperature compensation circuit is connected to a cathode of the Zener diode ZD1. Compared with the conventional voltage stabilization feedback circuits, the solution of the invention h