Self-powered circuit of switching power supply

• Main Authors: PANG JIHAO, JIA HONGYE, HE YUANJIAN
• Format: Patent
• Language: Chinese; English
• Published: 05.11.2021
• 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 utility model discloses a self-powered circuit of a switching power supply. The self-powered circuit comprises a PWM sequential control chip U1, a transformer T1, a diode D1, a diode D2, a diode D3, a Zener diode ZV1, a triode Q1, a triode Q2, a P-MOS tube Q3, a resistor R1, a capacitor C1, a polar capacitor CE1, a polar capacitor CE2, a resistor R2, a resistor RS1, a polar capacitor CE3 and a capacitor C2. According to the self-powered circuit of the switching power supply provided by the utility model, the PMOS triode is arranged to replace an auxiliary winding, so that the self-powered work of the power supply is well realized, the space occupied by a transformer is effectively reduced, the space occupied by the circuit is better reduced, and the self-powered circuit is more in line with the current trend of simplification of a circuit structure; and the progress of enterprises and industries is well promoted. 本实用新型公开了一种开关电源自供电电路，包括PWM时序控制芯片U1，变压器T1，二极管D1，二极管D2，二极管D3，稳压二极管ZV1，三极管Q1，三极管Q2，P-MOS管Q3，电阻R1，