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When you say Sinewave UPS, I believe you mean AC.
H-bridge when pumped by AC input is like a bridge rectifier. The reason for this is to make it 'Transformerless', so the charger can be small, lightweight and cheaper to mass produce.
The boost converter part of the battery charger is still the same in principle of typical boost converter.
Sometimes, this kind of charger is more commonly called Transformerless adapter or battery charger.
the transformer used for sinewave ups in case of 12v battery the transformer winding is 8v. I want to know how it charger the battery. how H bridge boost the voltage. what sequence of pulses is given to the mosfet gates.