Patent ID: 6137190
Filing Date: 2000-10-24
Classification: G06F,H02J

Abstract:
A system for providing coordinated turn on of paralleled power supplies supplying power via a system voltage bus, comprising:a computer system; anda plurality of power supplies, each power supply comprisingan internal detection circuit detecting whether an input voltage is sufficient to turn on and providing a startup conditions met signal indicating whether the input voltage is sufficient to turn on the power supply,a delay circuit receiving the startup conditions met signal from the internal detection circuit and, when the startup conditions met signal indicates the input voltage is sufficient, waiting for a delay period and then providing a start independently signal indicating that the power supply can start independently,a comparator receiving a bus voltage signal from the system voltage bus, comparing the bus voltage signal to a reference voltage signal, and providing, when the bus voltage signal exceeds the reference voltage signal, an other supply on signal indicating another power supply has turned on,an OR circuit receiving the start independently signal from the delay circuit, receiving the other supply on signal from the comparator, and providing, when either the start independently signal indicates the power supply can start independently or the other supply on signal indicates another power supply has turned on, an initiate turn on signal indicating the power supply can turn on, anda power supply control circuit receiving the initiate turn on signal from the OR circuit and causing the power supply to supply power to the computer system when the initiate turn on signal indicates the power supply can turn on.