Adding https in $html->url

Hi Friends,
In my project i am giving the links to payment page view as
follows.
<?php echo $html->url('/carts/authorize/); ?>

now i am getting the output url as http://mycart/carts/authorize/ what
i want to get is
https://mycart/carts/authorize/ , what i have to do for it,
anybody please help me.....

Thanks in Advance,
Jipson
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