switch mode power supply tutorial

{"title":"Snow Weather 200W Transformer Power Supply 110V - 130V Output Voltage","imgUrl":"https:\/\/img.chinax.com\/nimg\/48\/46\/3b88f1f2d39f0b8c4aa6d6cec0aa-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"Melicsigns","Model Number":"MSE-10","Minimum Order Quantity":"1 piece","Delivery Time":"7 days","Certification":"ISO9001,CE","Place of Origin":"CHANGZHOU-CHINA","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram","Supply Ability":"10000 pieces per week","Packaging Details":"carton","Product Name":"Transformer Switching Power Supply","Output type":"Single","Output Voltage":"110v -130V","Output Current":"16-67A","Waterproof":"IP67 Level","Warranty":"3 years"}}