Patent ID: 9425699
Filing Date: 2016-08-23
CPC Classification: H02M

Claim Text:
1. A multi-output power supply apparatus comprising: a power supply unit switching input power to output a plurality of voltages whose power levels are determined according to a switching operation; and a controller detecting power states of at least some of the plurality of voltages from the power supply unit, and limiting a range of a switching duty of the power supply unit to a pre-set range when the detected power states correspond to a pre-set limited power state, wherein the controller comprises: a duty range limiting unit comprising a maximum/minimum value controller setting a maximum value and a minimum value of a pulse signal according to a control signal indicating that states of some voltages correspond to the limited power state, and a duty controller limiting a duty range of the pulse signal according to the maximum value and the minimum value from the maximum/minimum value controller, wherein the maximum/minimum value controller comprises: a switch performing a switching on a current from a current source; a comparator controlling switching of the switch by comparing the control signal with a detection signal obtained by detecting the current flowing in the switch; and a current mirroring circuit setting the maximum value and the minimum value by mirroring the current flowing from the current source according to the switching of the switch.