Wireless chargers now have high power and low power, if similar to mobile phone low power wireless chargers, generally 5V2A current is the best, high power home appliances wireless charger is generally input 110V-220V voltage and current in about 2-5A, but also more specific product power, the best current voltage is relative to the product itself.
Car wireless charging voltage is generally 5v1A, no transformation is generally the lowest!