초록 ▼

A power system includes a battery back-up unit (BBU) having back-up battery circuitry which provides battery back-up support for a plurality of power supplies each having a respective power factor correction circuit front-end with a boost stage. The voltages output from the boost stages of the power

A power system includes a battery back-up unit (BBU) having back-up battery circuitry which provides battery back-up support for a plurality of power supplies each having a respective power factor correction circuit front-end with a boost stage. The voltages output from the boost stages of the power supplies are monitored and compared with respective reference threshold voltages to derive a signal which is used to bring battery back-up power on-line when a monitored voltage falls below a threshold voltage, which may be indicative of a loss of AC mains input voltage. AC mains input voltage is also monitored to detect a restoration and disconnect the battery back-up power. In the event that battery back-up is brought on-line due to a faulty power supply rather than a loss of AC mains input voltage, the faulty power supply can be masked and reported for repair.

대표청구항 ▼

[ What is claimed is:] [1.] In a power system, having a battery back-up unit including battery back-up circuitry and at least one battery which can be selectively connected to an output of the battery back-up unit, the power system further having a plurality of power supplies, each power supply bein

[ What is claimed is:] [1.] In a power system, having a battery back-up unit including battery back-up circuitry and at least one battery which can be selectively connected to an output of the battery back-up unit, the power system further having a plurality of power supplies, each power supply being connected to the output of the battery back-up unit, and each power supply having a front end section including a power factor correction circuit with a boost stage providing an output voltage, a method of controlling battery back-up comprising:monitoring respective boost stage output voltages of the plurality of power supplies by comparing each of the boost stage output voltages of the plurality of power supplies with a respective reference threshold voltage; andwhen the monitoring indicates a respective boost stage output voltage is lower than the respective reference threshold voltage, signaling the battery back-up circuit and providing battery power to the plurality of power supplies by connecting the battery back-up circuitry to the output of the battery back-up unit.