Patent ID: 8110947
Filing Date: 2012-02-07
Classification: H02J

Abstract:
1. An uninterruptible power supply (UPS) watchdog system that compulsively recovers a power supply path to a normal power line for a preset number of times, in case the power supply path is switched from the normal power line to a bypass line, wherein the UPS watchdog system comprises: an inverter-on generating unit that generates an inverter-on signal for turning on an inverter of the UPS in case a bypasss signal is generated; a recovery signal generating unit that generates a recovery signal for changing the power supply path from the bypass line to the normal power line according to the bypass signal, the inverter-on signal and a recovery stop signal, a counter unit that outputs an accumulation count signal of a magnitude corresponding to a number of occurrences of the recovery signal; a counting comparison unit that generates a counting comparison signal in case the magnitude of the accumulation count signal is greater than a preset reference value; and a recovery stop unit that controls the generation of the recovery stop signal reset signal for stopping the counter unit from counting when the counting comparison signal is generated.