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$.ajax({
	type: "POST",
	url:"action.php",
	data: {
		"model"	: "moduloqualquer",
		"dados"	: $('#formulario').serialize()
	},
	success: function(data){

		//...

	}
});

<form id="formulario">
<input type="text" name="key1" />
<input type="checkbox" name="key2" value="value2" checked />
<input type="checkbox" name="key2" value="value3" checked />
<input type="hidden" name="key3" value="value4" />
<input type="submit" value="ENVIAR" />
</form>

<?php

echo $_POST['dados'];