Laptop power help?

I have 2 Dell Laptops which I bought in USA. I'm using them in India. Indian electricity details: 240V at 50-60 Hz and 50W. USA: 120V. I bought step down transformers which convert 240V to 120V. But they didn't work. Both the laptops are capable of handling 110V to 240V. When I use a plug pin converter... show more I have 2 Dell Laptops which I bought in USA. I'm using them in India. Indian electricity details: 240V at 50-60 Hz and 50W.
USA: 120V.
I bought step down transformers which convert 240V to 120V. But they didn't work. Both the laptops are capable of handling 110V to 240V. When I use a plug pin converter alone the laptops get charged, but when I use the transformers, they don't charge. When I used these laptops directly with 120V in USA, they worked fine. I'm clueless as of what to do. Please help me. Thanks in advance.
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