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发明授权
CN102577057B 用于管脚功率因数修正的方法和电路 失效 - 权利终止

用于管脚功率因数修正的方法和电路
摘要：
本发明涉及一种用于在交流/直流功率转换器中的功率因数修正的方法和电路。电路具有电感器(L)，其由整流过的交流电压(vin)供电，此外，电路具有开关(Sw)，可借助于该开关通过其接通和断开使电感器(L)充电和放电，并且此外电路具有二极管(D)，借助于其可将电感器(L)的放电电流通输送到电路的输出端。通过带有单个传感器管脚(PINsens)的控制单元(PFC)进行对开关(Sw)的控制，传感器提供由两个叠加的电压分量(vR2，vWs)组成的传感器信号(vsens)。从分压器中得到一个电压分量(vR2)，并且从变压器的二级绕组(Ws)中得到另一电压分量(vWs)，由电感器形成变压器的初级绕组(Wp)。分压器(R1，R2)和变压器的二级绕组(Ws)串联。分压器比例(R1/R2)和变压器的绕组比例(Wp/Ws)彼此相等(k)。
摘要（英）：

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 The one voltage component (vR2) is withdrawn from a voltage divider, and the other voltage component (vWs) is withdrawn from the secondary winding (Ws) of a transformer, the primary winding (Wp) of which is formed by the inductor.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).

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