Uniterruptible power system
First Claim
1. An uninterruptible power system comprising:
- a rectifier for rectifying AC power from a power line;
an inverter for converting DC power from the rectifier to AC power;
a sealed lead-acid battery connected to the rectifier and the inverter via a first switch;
a charger for supplying charging power from the power line to the battery via a second switch; and
a control signal generator capable of monitoring at least the voltage of the power line and the closed circuit voltage of the battery with the first switch closed and which normally opens the first and second switches to supply electric power from the power line to a load either directly or via both the rectifier and inverter, the control signal generator closing the first switch with failure of the power line to covert the DC power from the battery to AC power by means of the inverter, for continuing the supply of electric power to the load;
and wherein after recovery of the power line, the control signal generator opens the first switch to supply electric power from the power line, closes the second switch to charge the battery via the charger, detects the closed circuit voltage of the battery, and opens the second switch.
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Accused Products
Abstract
There is disclosed an improved uninterruptible power system used as a back-up power supply for a computer or communication equipment. The system comprises a rectifier for rectifying AC power from a power line, such as the utility line, an inverter for converting the DC power from the rectifier to AC power, a sealed lead-acid battery connected with the junction of the rectifier and the inverter via a first switch, a charger for supplying charging power from a power line to the battery via a second switch, and a control signal generator. The generator monitors the voltage of a power line and the closed circuit voltage of the battery. Usually, the two switches are opened. In the event of the failure of a power line, the generator closes the first switch to supply the load with electric power. After a power line has been recovered, the second switch is closed to charge the battery via the charger only for a calculated short time.
76 Citations
12 Claims
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1. An uninterruptible power system comprising:
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a rectifier for rectifying AC power from a power line; an inverter for converting DC power from the rectifier to AC power; a sealed lead-acid battery connected to the rectifier and the inverter via a first switch; a charger for supplying charging power from the power line to the battery via a second switch; and a control signal generator capable of monitoring at least the voltage of the power line and the closed circuit voltage of the battery with the first switch closed and which normally opens the first and second switches to supply electric power from the power line to a load either directly or via both the rectifier and inverter, the control signal generator closing the first switch with failure of the power line to covert the DC power from the battery to AC power by means of the inverter, for continuing the supply of electric power to the load; and wherein after recovery of the power line, the control signal generator opens the first switch to supply electric power from the power line, closes the second switch to charge the battery via the charger, detects the closed circuit voltage of the battery, and opens the second switch. - View Dependent Claims (2, 3, 4, 5, 6, 12)
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7. An uninterruptible power system comprising:
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a rectifier for rectifying AC power from a power line; an inverter for converting DC power from the rectifier to AC power; a sealed lead-acid battery connected to the rectifier and the inverter via a switch; a control signal generator capable of monitoring at least the voltage of the power line and the closed circuit voltage of the battery with the first switch closed and which normally opens the switch to supply electric power from the power line to a load either directly or via both the rectifier and inverter, the control signal generator closing the switch with failure of the power line to covert the DC power from the battery to AC power by means of the inverter, for continuing the supply of electric power to the load; and wherein after recovery of the power line, the control signal generator detects the closed circuit voltage of the battery charged via the rectifier, and opens the switch. - View Dependent Claims (8, 9, 10, 11)
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Specification