THREE-PHASE BOOST RECTIFIER CIRCUIT AND CONTROL METHOD THEREOF, AND AN UNINTERRUPTED POWER SUPPLY

The invention relates to a three-phase boost rectifier circuit and a control method thereof, and an uninterrupted power supply, which contains at least first battery packs BAT+, second battery packs BAT−, and a boost rectifier module; the boost rectifier module comprises a first bidirectional thyristor SCR a second bidirectional thyristor SCR a third bidirectional thyristor SCR a fourth bidirectional thyristor SCR a first unidirectional thyristor SCR a second unidirectional thyristor SCR a first inductor L a second inductor L a third inductor L a three-phase fully controlled rectifier bridge, a first capacitor C and a second capacitor C The invention can ensure the balance of positive and negative bus's voltage without the balancing device under battery operated boost mode, while improving the efficiency and reliability of the battery operated boost mode.