Difference Between Floating Charger, Boost Charger and Trickle Charger

Floating Charger is used to maintain the battery voltage. It charges the battery as similar rate of battery discharge. Example Now battery is draining two ampere means the charger supplies 2 amperes of current. if the battery voltage is full then the battery stops supplying current. Like that floating charger works. At that same time Float voltage is the voltage at which a battery is maintained after being fully charged to maintain that capacity by compensating for self-discharge of the battery
Charging rate is Slow
Mainly used to avoid over charging of battery.
Battery chargers may stop when the battery is full. A float charger senses when a battery voltage is at the appropriate float level and temporarily ceases charging; it maintains the charge current at zero or a very minimal level until it senses that the battery output voltage has fallen, and then resumes charging
The output voltage of the float charging is low as compared with boosting charging.
A float charger may be kept connected indefinitely without damaging the battery.
It needs soft start arrangement to avoid high initial Float current resulting from restoration of main A.C. supply.
It will have separate transformer, rectifier and controls etc.

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Boost charger is used to charge the battery from zero current to full current. which means the charger supplies, high current to the battery. Example Now we need to charge a 12 V 100AH battery means with 200 Amps FLA charger means, the charger delivers maximum allowable current to the battery, hence the battery charges fastly.
Charging rate is high, typically full load capacity of the charger,
During emergency when A. C. supply fails, the battery shall meet the DC Load. Battery will be discharged after catering the load and it will require boost charging to charge the battery immediately when the battery working on high load requirement.
The output voltage is high, since the battery draw high amount of current from the charger.
Boost charger ensures that while boost charging if AC supply fails there shall not be any break in DC supply to load. Since this is a No Break Power Supply System.
It does not require to be in online continuously.

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Charging a fully battery charged battery as the rate of discharging is called trickle charger.
Only difference between floating charger and trickle charger is that the floating charger has circuitry to prevent battery overcharging. Remaining all are same as the floating charger.