| 摘要 |
<p>The invention relates to a method and to a circuit for power factor correction in an alternating current/direct current power converter. The circuit has an inductor (L), which is fed by a rectified alternating voltage (vin), furthermore a switch (Sw), by means of which the inductor (L) can be charged and discharged by closing and opening same, and a diode (D), by means of which the discharge current of the inductor (L) can be supplied to the output of the circuit. The switch (Sw) is controlled by a control unit (PFC) having a single sensor PIN (PINsens), which is supplied with a sensor signal (vsens) consisting of two superimposed voltage components (vR2, vWs). The one voltage component (vR2) is withdrawn from a voltage divider, and the other voltage component (vWs) is withdrawn from the secondary winding (Ws) of a transformer, the primary winding (Wp) of which is formed by the inductor. The voltage divider (R1, R2) and the secondary winding (Ws) of the transformer are connected in series. The voltage divider ratio (R1/R2) and the winding ratio (Wp/Wp) of the transformer are equal to each other (k).</p> |
