Patent ID: 7301248

Claim:
A control method for a voltage boosting circuit used in an uninterruptible power supply, wherein the uninterruptible power supply comprises a battery module and a voltage boosting circuit having a plurality of switch elements, and is operating under a battery power supply mode, the control method comprises the steps of: detecting an output voltage of the battery module and a regulated predetermined output voltage of the voltage boosting circuit; when the output voltage of the battery module is lower than the regulated predetermined output voltage of the voltage boosting circuit, sending a first switching signal to regulate the switching operation of the switch elements of the voltage boosting circuit; and when the output voltage of the battery module is higher than the regulated predetermined output voltage of the voltage boosting circuit, sending a second switching signal to regulate the switching operation of the switch elements of the voltage boosting circuit, in order that the output voltage of the voltage boosting circuit is substantially equal to the output voltage of the battery module.