Patent ID: 7081741
Filing Date: 2006-07-25
Classification: H02M

Abstract:
1. A multi-output power supply comprising: an input power supply, a first converter section having a first switch, a first inductor and a first rectifier, to which a power is supplied from said input power supply and from which a first output voltage is output, a first detection circuit for outputting a first control signal corresponding to said first output voltage, a first oscillation circuit for outputting a first triangular wave signal having a predetermined frequency and a clock signal synchronized with said first triangular wave signal, a first pulse-width modulation circuit for outputting a first drive signal for turning ON or OFF said first switch by comparing at least said first control signal with said first triangular wave signal, a second converter section having a second switch, a second inductor and a second rectifier, to which a power is supplied from said input power supply and from which a second output voltage is output, a second detection circuit for outputting a second control signal corresponding to said second output voltage, a second oscillation circuit for outputting a second triangular wave signal synchronized with said clock signal, a current detection circuit for outputting a current signal corresponding to the current flowing in said second inductor, and a second pulse-width modulation circuit for generating and outputting a second drive signal for turning ON said second switch depending on said clock signal and for turning OFF said second switch depending on at least the signal obtained by comparing said second control signal with said current signal.