Research And Design Of Low-power Consumption Switching Power Supply Module

The rapid development of integrated circuits has made electronic products increasingly intelligent and portable,As the core of electronic equipment,the design of the power supply needs to ensure that the product is small in size,and at the same time,it needs to improve the stability,efficiency and other indicators.To meet the industry requirements of high efficiency and high stability of the switching power supply system,to ensure a reasonable size,from the perspective of low power consumption and low cost,designed a low-power flyback AC-DC single input dual output switching power supply based on pulse width modulation control.The flyback power module has one input and two outputs.The two outputs are 60 W and 240 W,respectively.The 60 W power module is a conventional flyback switching power supply,which can meet the requirements of low-power electronic products.Due to the fact that the efficiency of the forward type is generally higher than that of the flyback type,switching power supplies at the level of 100 watts are usually of the forward type,but their cost is higher and the circuit complexity is greater than that of the flyback type.The design of the 60 W power supply module retains the characteristics of conventional flyback power supplies,and is further optimized on the basis of the 60 W module to ensure high efficiency when loaded.The complexity of the circuit design is less than that of the same type of forward type,and the cost is also controlled in a lower range.A 240 W flyback switching power supply module has been designed,which can meet the requirements of high-power electronic equipment.This design uses Altium Designer circuit design software to complete the overall circuit design and PCB drawing,and Simplis switching power supply simulation software is used to complete the simulation verification of circuit functions.The focus of the circuit design is on the 240 W module.In order to ensure the normal operation of the two outputs,the main goal is to improve the efficiency of the 240 W module,and the 60 W module can ensure its efficiency to be above 80%.The front stage of the circuit is equipped with a power factor correction circuit to reduce reactive power loss,and magnetic devices such as high-frequency transformers are designed to reduce magnetic loss.The output part is a synchronous rectification circuit.The input voltage range of the overall circuit is 176V-264 V,and the operating frequency is 65 KHz.The design indicators of the circuit are:the output voltage of the 60 W part is 5 V,the output current is 12 A,the efficiency reaches above 80%,the output voltage ripple rate is below 1%,the output voltage undershoot is1%,the output voltage recovery time under dynamic load is 3 ms,the gain margin is 15.6d B,and the phase margin is 52.7 deg to meet industry requirements;The 240 W part has an output voltage of 20 V,an output current of 12 A,an efficiency of over 90%,an output voltage ripple rate of less than 1%,an output voltage undershoot of 0.98% under dynamic load,and an output voltage recovery time of 3.1 ms.The gain margin is 11 d B,and the phase margin is 67 deg,meeting industry requirements.After verifying the expected indicators of this design through simulation,a prototype circuit is produced for physical debugging to further verify and improve the function of the circuit,strive to achieve the system to meet the six-level energy efficiency standard.