Isolated DC-DC power supply circuit

• Main Authors: ZHU FUBING, FENG ZHIGANG, XING YIBIN
• Format: Patent
• Language: Chinese; English
• Published: 03.12.2019
• 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; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION

The invention provides an isolated DC-DC power supply circuit and belongs to the field of an isolated power supply circuit. The circuit comprises a voltage input end, a primary power control circuit,a transformer, a load circuit and a voltage output end, wherein the voltage input end is connected with a primary winding of the transformer through the primary power control circuit, a secondary winding of the transformer is connected with the voltage output end through the load circuit, the voltage input end is used for accessing an input voltage, the primary power control circuit is used as a PWM control generator based on a power supply chip of which the model is NCP3063, the primary winding of the transformer is excited to generate voltage change through opening and closing of an internally integrated power device, a changing voltage is coupled on the secondary winding of the transformer according to the transformation ratio relationship of the transformer, and the secondary changingvoltage provides the volta