Controller and power converter using the same

A power converter comprising:

• an inductor;
• a switch configured to be turned on or turned off according to a control signal, to control the flow of a current flowing through the inductor;
• and
• a control unit configured to output the control signal, wherein the control unit comprises:
• a switch signal unit configured to output the control signal repeating a high state and a low state, by receiving a first signal and a second signal;
• a first signal generation unit configured to generate the first signal, and configured to transmit the first signal to the switch signal unit;
• and
• a second signal generation unit configured to generate the second signal by comparing a sensing voltage and a variable first reference voltage, and configured to transmit the second signal to the switch signal unit, wherein the first signal generation unit is configured to adjust a transmission time of the first signal by sensing a voltage level of the first reference voltage.

A power converter comprising:

• a power generation unit configured to apply a predetermined voltage to a load, and to flow a driving current through an inductor;
• a sensing unit configured to sense the size of the driving current, and to output a sensing voltage corresponding to the size of the driving current;
• and
• a control unit configured to output a control signal to make uniform an average of the size of the driving current, in response to the size of a first reference voltage, while adjusting the average of the size of the driving current by varying a voltage level of the first reference voltage.