Patent ID: 7911083
Filing Date: 2011-03-22
Classification: H02J

Abstract:
1. A power supply system comprising: a power line; a first plurality of uninterruptible power supply (UPS) devices coupled to receive power from the power line, the first plurality of UPS devices including a first timer delay and control circuitry configured to couple power conversion circuitry to the power line when available power is acceptable and at expiration of the first timer delay; a second plurality of UPS devices coupled to receive power from the power line, the second UPS devices including a second timer delay, and control circuitry configured to couple power conversion circuitry to the power line when available power is acceptable and at expiration of the second timer delay, where a delay interval exists between the first timer delay and the second timer delay; and a controller configured to program the first timer delay and the second timer delay, wherein the controller is further configured to balance distribution of UPS devices programmed at the first timer delay and UPS devices programmed at the second timer delay.