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Design ideas for high-efficiency switching power supplies

2013-09-22
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Design ideas for high-efficiency switching power supply: 1. Analysis of switching power supply loss and reduction methods The loss of the converter is mainly the loss of the switch tube 1. The conduction loss of the switch tube; 2. The switching loss of the switch tube. The voltage and current of the conduction loss of the switch tube are both effective values. The rectangular wave is the relationship between the duty cycle and the effective value. Reducing the conduction voltage of the switch tube can effectively reduce the conduction loss 1. For MOSFET, reducing the on-resistance can effectively reduce the conduction loss. For example, replacing IRF840 with IRF740 can reduce the on-resistance from 0.8 0.8Ω to 0.55 0.55Ω, and the conduction loss can be reduced by more than 40%; if CoolMOS\'s SPP07N06C3 (RDS DS (ON ON) = 0.6 = 0.6Ω) is used to replace IRFBC40 IRFBC40 (RDS DS (ON ON) = 1.2 1.2Ω), the conduction loss can be reduced by half.

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