Adapter option; match wattage, connector and your original adapter. HP guide description: "90 W PFC ADPTR S-3P 4.5MM (select 15" products only)". OEM documentation only; not bench-tested.
Source notes
HP ProBook 640 G2 Notebook PC / HP ProBook 645 G2 Notebook PC / HP ProBook 650 G2 Notebook PC / HP ProBook 655 G2 Notebook PC Maintenance and Service Guide, printed p31 (PDF p41): "90 W PFC ADPTR S-3P 4.5MM (select 15" products only) 710413-001".