source:Industry News Popular:adapter release time:2021-06-30 09:20:21 Article author:sznbone
Selection of input rectifier: In order to reduce the size of the power adapter, it is necessary to choose a rectifier bridge. In this power adapter, the parameters of the rectifier bridge are 4A, and 800V meets the requirements of the design book about the selection of input rectifiers.
The choice of input rectifier filter capacitor: The input rectifier filter capacitor without exception chooses electrolytic capacitors. In order to ensure high temperature life, 450V withstand voltage and 150F capacitance are selected, which conforms to the "rule" of 3~5F per watt.
The choice of switch tube: From the perspective of AC input minimum voltage of 85V and economical and practicality, the switch tube is selected 2SK2645, which is a 600V/A1.20 MOSFET, which is equal to IRFBC40 level 600V/6.2M1.20, but It is much more expensive than IRFHC40. It is characterized by a full plastic shell, which saves the insulation between the switch tube and the radiator.
Selection of output rectifier: Since the output voltage is 12V and the supply voltage is internationally accepted voltage level, the output rectifier chooses Schottky diodes, with a withstand voltage of 120V, a current of 30A, and a conduction voltage of 0.88V. The purpose of choosing 30A is to be large. Reduce the forward voltage of the output rectifier diode, such as from 0.8N under the rated current to about 0.4V of the 8A peak current to improve the efficiency of the power adapter.
The consideration of the large-scale derating selection of the switch tube and the output rectifier diode may be: referring to other advanced power adapter designs, in order to improve the reliability and efficiency of the power adapter.
Selection of output rectifier filter capacitor: The output filter capacitor chooses two 16V/10OF high-frequency low-resistance electrolytic capacitors in parallel, and then an LC filter circuit is set up. The electrolytic capacitor is a 16V/470F high-frequency low-resistance electrolytic capacitor.
Analysis of Power Adapter Transformer Data
Core: EC35, material 3C8. Under the condition of 40kHz, domestic power ferrite cores can meet the requirements.
Primary side: American Standard (AWG) No. 26 wire with 45 turns. The diameter of American Standard (AWG) No. 26 wire is 0.45mm, and the national standard 0.44 wire diameter can be used.
Secondary side: ±12V, 9 turns of American Standard No. 30 wire. The diameter of American Standard (AWG) No. 30 wire is 0.315mm, and the national standard 0.35 wire diameter can be used.
Secondary side: 5V, 6-strand American standard No. 26 4-turn wire in parallel.
Auxiliary power winding, American standard No. 30 wire, 10 turns.
The air gap is about 0.1in (2.54mm), corresponding to the primary side inductance lmH.
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