SWITCH CONTROL CIRCUIT, SWITCH CONTROL METHOD AND CONVERTER USING THE SAME

摘要

Provided is a switch control circuit for controlling a current control switch of a power supply, the power supply including a load, an inductor and the current control switch that are series-coupled to an input power. The switch control circuit includes a current measuring unit configured to measure a current flowing into the load, a current integral unit configured to integrate the measured current, a comparison unit configured to compare the integrated current value and a reference value and a control unit coupled to the current control switch, the control unit being configured to turn off the current control switch when the integrated current is substantially the same as the reference value and turn on the current control switch when a predefined off-time elapses from a time when the current control switch is turned off. The switch control circuit may quickly and accurately control an average current.

主权项

1. A switch control circuit for controlling a current control switch of a power supply, the power supply comprising a load, an inductor and the current control switch that are series-coupled to an input power, the switch control circuit comprising:
a current measuring unit configured to measure a current flowing into the load; a current integral unit configured to integrate the measured current; a comparison unit configured to compare the integrated current value and a reference value; and a control unit that is coupled to the current control switch, the control unit being configured to turn off the current control switch in response to the integrated current value being substantially same as the reference value and to turn on the current control switch in response to a predefined off-time having elapsed from a time when the current control switch is turned off.