Abstract: A power controller is provided. The power controller has a peak current setting unit utilized for deciding a peak current value according to a divided input voltage and a current limit turn-on time value. The comparator sends a first trigger signal once a current value of a power switch of the power system reaches the peak current value. The turn-on time calculation module defines the number of current limit operations by using the count of first trigger signals received in a calculation time period and then processes a recursive calculation to calculate a turn-on time value according to the current limit turn-on time value, the number of current limit operations, and a target number of current limit operations. The timer transmits a second trigger signal when the set turn-on time value is counted. The switch control module turns off the power switch when receiving one of the first and the second trigger signal.

Abstract: A converter control system includes an analog-to-digital converter, a filter and a control module. The analog-to-digital converter digitalizes a different-time and a real-time feedback voltage. The filter bases on the different-time feedback voltage to sample a historical average feedback voltage. The control module receives the real-time feedback voltage, bases on the historical average feedback voltage to detect a load status of the converter, and bases on the real-time feedback voltage and the historical average feedback voltage to derive a voltage difference. The control module applies a control duty cycle to control the load switch. While the control module detects that the load status switches to a heavy-load status and the voltage difference reaches the threshold voltage, the control duty cycle is increased. While the control module detects that the load status switches to the light-load status and the voltage difference reaches the threshold voltage, the control duty cycle is decreased.

Abstract: A power control system is electrically connected to a power function circuit including a power circuit, a coil module, a switch, and a load circuit, and includes at least one timer, a zero-current trigger unit, a status control unit, and a driver unit. The status control unit has a first status interval, a second status interval, a third status interval and a fourth status. The power control method triggers the status control unit to change the status interval when a counting time reaches one specific time interval corresponding one status interval. When a coil voltage of the coil module drops to zero from a voltage larger than a positive threshold voltage in the third status interval or the fourth status interval, the status control unit triggers to change the status interval, re-enters the first status interval, resets the timer, and triggers the driver unit to open the switch.