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In this paper, the operation principle of the electronic transformer and the factor influenced the switching frequency of electronic transformer are introduced in detail. Meanwhile a regulated power supply which is reformed by electronic transformer is proposed. Using voltage and current feedback, it realizes the constant output voltage and the over-current protection. The feedback theory is given in detail. The 150 W regulated power supply with the advantages of simple structure, light weight and low cost is developed.

The Design of 150 W Regulated Power Supply Based on Principle of the Electronic Transformer