SWITCHING MODE POWER SUPPLY AND SWITCHING CONTROL CIRCUIT THEREOF

摘要

There are provided a switching-mode power supply (SMPS) and a switching control circuit thereof. The switching-mode power supply includes: a power supply circuit switching input power generated by rectifying AC power with a switching transistor to generate output power having a pre-set voltage level; and a switching control circuit having a charging and discharging unit generating a charge current to be charged in the switching transistor or a discharge current to be discharged from the switching transistor and a charging and discharging controller determining whether to charge or discharge the switching transistor according to a voltage level of the output power, wherein an amount of the charge current and an amount of the discharge current are linearly varied according to a voltage level of the input power.

主权项

1. A switching-mode power supply comprising:
a power supply circuit switching input power generated by rectifying AC power with a switching transistor to generate output power having a pre-set voltage level; and a switching control circuit having a charging and discharging unit generating a charge current to be charged in the switching transistor or a discharge current to be discharged from the switching transistor and a charging and discharging controller determining whether to charge or discharge the switching transistor according to a voltage level of the output power, wherein an amount of the charge current and an amount of the discharge current are linearly varied according to a voltage level of the input power.