Voltage-regulating circuit with input voltage detecting circuit and parallel voltage-regulating circuit system using the same

摘要

A voltage-regulating circuit according to the present invention includes a power conversion circuit, an input voltage detecting circuit and a feedback circuit. The power conversion circuit includes at least one switch element, wherein during operation of the at least one switch element, an input voltage is converted into a transition voltage. The input voltage detecting circuit is connected to the power conversion circuit for outputting a detected voltage signal corresponding to the input voltage. The feedback circuit is connected to the power conversion circuit and the input voltage detecting circuit for generating a feedback control signal. In such way, as the input voltage is changed, the feedback circuit will adjust to make the transition voltage changed as with the change of the detected voltage signal corresponding to the input voltage.

主权项

1. A voltage-regulating circuit comprising:
a power conversion circuit comprising at least one switch element, wherein during operation of said at least one switch element, an input voltage is converted into a transition voltage; an input voltage detecting circuit connected to said power conversion circuit for outputting a detected voltage signal corresponding to said input voltage; a feedback circuit connected to said power conversion circuit and said input voltage detecting circuit, wherein said feedback circuit receives said transition voltage and said detected voltage signal, and generates a feedback control signal according to said transition voltage and said detected voltage signal; and a control driving circuit connected to said switch element and said feedback circuit for receiving said feedback control signal, and controlling a duty cycle of said switch element to be higher than a preset duty cycle according to said feedback control signal; wherein as said input voltage is changed, said feedback circuit will adjust to make said transition voltage changed as with the change of said detected voltage signal corresponding to said input voltage.