| 主权项 |
1. A maximum power point tracking controller, suitable for controlling an output voltage of a power converter, comprising:
a slope detection unit, calculating whether the output voltage is in a positive trend or in a negative trend according to a detection signal corresponding to the output voltage in order to output a trend signal, wherein a voltage level of the trend signal is a first voltage level or a second voltage level when the output voltage is in the positive trend or the negative trend, wherein the slope detection unit comprises:
a first voltage detection unit, integrating the detection signal within a first time interval from a first time point to output a first amplified signal;a second voltage detection unit, integrating the detection signal within the first time interval from a second time point later than the first time point to output a second amplified signal, wherein a difference between the first time point and the second time point is a second time interval; anda comparison unit, calculating a trend of the output voltage from the first time point to the second time point according to the difference between the first amplified signal and the second amplified signal, and determining the voltage level of the trend signal according to the trend of the output voltage; and a control unit, having a first operation mode and a second operation mode to respectively increase and decrease a duty cycle of a PWM signal, wherein the control unit switches a current operation mode to perform a maximum power point tracking procedure when the trend signal is changed from the first voltage level to the second voltage level. |
