| 摘要 |
A one-cycle controlled power factor correction method. The method is used for a boost converter and is realized by a system main control chip. A bus voltage sampling value U o and an inductor current sampling value i g are detected at A/D sampling trigger time according to the method. Voltages u 1 ( t ) and u 2 ( t ) are calculated according to the following formulas. The duty cycle of a PWM signal is calculated according to the calculated voltages. The PWM signal is output and the next A/D sampling trigger time is calculated according to the duty cycle (I). Wherein, R s is a current sensing resistor, u m is a voltage which is achieved by controlling the difference between the voltage U o and a reference value U ref by using a PI controller, and T is a switching period. |
