Patent ID: 8073644

Claim:
An automatic voltage-identifying power supply method, comprising: a wait process determining if a post-stage power-receiving device exists, and going to a next step until the post-stage power-receiving device exists; a measurement process having a step of outputting a test voltage signal to the post-stage power-receiving device and continuously measuring a response current signal fed back from the post-stage power-receiving device; and a step of determining if the post-stage power-receiving device reaches a stable power consumption variation corresponding to the test voltage signal or a stable current consumption variation corresponding to the response current signal, wherein if the determination result is negative, continuously varies and outputs a test voltage signal to the post-stage power-receiving device, measures a corresponding response current signal and determines again if the post-stage power-receiving device reaches a stable power consumption variation or a stable current consumption variation; and if the determination result is positive, perform a next step; a supplying power process obtaining an input voltage signal from a pre-stage power supply device, letting the test voltage signal reaching a stable power consumption variation or a stable current consumption variation be a rated voltage to continuously output the rated voltage to the post-stage power-receiving device, continuously determining if the post-stage power-receiving device exists, and if the determination result is negative, continuously executing the step, and if the determination result is positive, executing a next step; and a step of terminating to output power to the post-stage power-receiving device and returning to the step of determining if the post-stage power-receiving device exists.