Resistorless precharging

The invention relates to resistorless precharging. A boost PFC converter (11) includes a rectifier (12), a converter (13) and an output stage comprising an output capacitor (6) where the DC output voltage (7) is provided across the output capacitor (6). The rectifier includes four rectifying elements connected in a full bridge configuration where the upper two of these four rectifying elements arethyristors (9.1, 9.2) and where the lower two are diodes (9.3, 9.4). In that the thyristors (9.1, 9.2) are controlled such as to be open for only a part of each half period of the input voltage, theamount of current per half period that is passed to the output capacitor (6) is controllable and can be made very small. Accordingly, the charge current for precharging the output capacitor (6) can becontrollably limited such that a bulky precharge resistor is not required anymore to avoid high inrush currents. 本发明涉及无电阻器预充电。升压PFC转换器（11），其包括整流器（12）、转换器（13）和包含输出电容器（6）的输出级，其中跨输出电容器（6）提出DC输出电压（7）。整流器包括以全桥配置而连接的四个整流元件，其中这四个整流元件