Cyberpower Systems, Inc.

Kai-Tsung Yang

Jui-Hung Chou

Lien-Hsun Ho

Shou-Ting Yeh

Fang-Yu Hsu

An uninterruptible power system and an operation method thereof are provided. The uninterruptible power system comprises a DC-AC conversion circuit, a plurality of switches, a plurality of sensing units, a plurality of output ports and a control unit. Each output port is electrically coupled to an output terminal of the DC-AC conversion circuit sequentially through one of the sensing units and one of the switches. The control unit is configured to define members of at least one group from the output ports according to a system setting, and define which members of each group are non-critical output ports according to the system setting. The control unit is further configured to set, according to the system setting, at least one condition for all non-critical output ports in each group to simultaneously stop supplying power, and to accordingly control the operations of the corresponding switches.

Uninterruptible power system and operation method thereof

An off-line uninterruptible power system and two line-interactive uninterruptible power systems are provided. The off-line uninterruptible power system and one of the line-interactive uninterruptible power systems additionally adopt a transformer for supplying an AC output, with lower voltage level than a rated output voltage, to at least one electrical device (especially those with resistive load characteristic). The other line-interactive uninterruptible power system controls its automatic voltage regulating circuit to supply an AC output, with lower voltage level than a rated output voltage, to at least one electrical device (especially those with resistive load characteristic).

Off-line uninterruptible power system and line-interactive uninterruptible power system

A power supplying device comprising a battery, a charging circuit and a DC-AC conversion circuit is provided. The charging circuit is electrically coupled to an AC power source and configured to charge the battery. The DC-AC conversion circuit is electrically coupled to the battery and configured to supply an AC output. When the power supplying device is powered on, both of the charging circuit and the DC-AC conversion circuit are enabled.

Power supplying device

The invention provides an uninterruptible power supply, which comprises a battery management circuit and a control circuit. The battery management circuit is electrically coupled to each battery of at least one battery string for measuring the voltage of each battery. When the battery strings discharge, the control circuit obtains the voltage of each battery through the battery management circuit to calculate the discharge current of each battery, and determines whether there is any measured voltage having dropped to an EOD voltage corresponding to a discharge current of a corresponding battery. When the determination result is positive, the control circuit controls the uninterruptible power system to stop the discharging of at least one battery string in which there is at least one measured voltage having dropped to an EOD voltage corresponding to a discharge current of a corresponding battery. Furthermore, a corresponding battery management apparatus is also provided.

Uninterruptible power supply and battery management apparatus thereof

A volume control device suitable for an uninterruptible power system comprising a fan is provided. The volume control device comprises a user interface and a control circuit. The control circuit is electrically coupled to the fan and the user interface, and is used to receive a maximum operation volume setting value through the user interface. When the control circuit is ready to increase the rotation speed of the fan, it further determines whether the corresponding volume of the current rotation speed of the fan is less than the maximum operation volume setting value, and accordingly determines whether to adjust the rotation speed of the fan.

Growing community of inventors

Taipei, Taiwan

Kai-Tsung Yang