Here is an example of a STEP-DOWN Converter. 200-400vdc input ($25) This one may not be your voltage so you may have to do a search to find what you need but they are available.
https://www.ebay.com/itm/Lambda-Powe...EAAOSwlRVfvTrs
s-l1600.jpg
https://www.ebay.com/itm/Lambda-Powe...EAAOSwlRVfvTrs
s-l1600.jpg
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