| 摘要 |
<p>The present invention relates to the technical field of UPS, and specifically to a UPS having dual bus charging circuits. Comprised are the dual bus charging circuits. The dual bus charging circuits comprise a positive bus charging circuit and a negative bus charging circuit. When the UPS supply is charging a battery, switch transistor Q1 and switch transistor Q2 of the dual bus charging circuits are conducted alternately to allow, within one timeslot, one charging circuit between the two charging circuits of the dual bus charging circuits to draw electricity from the bus, while the other charging circuit relies on inductance wheeling to charge the battery, thus allowing the two charging circuits to not conflict with each other. Also, as the two charging circuits alternately draws power and wheels for charging, implemented is simultaneous drawing of electricity from the positive bus (Bus+) and negative bus (Bus-) of a power supply mains circuit by the dual bus charging circuits to charge the rechargeable battery. This ensures load balancing between the positive bus (Bus+) and the negative bus (Bus-), improves the output characteristics of the UPS, while at the same time does not affect the input power factor and input THDI of the UPS, and is energy-saving and environmentally friendly.</p> |
