Switching circuit arrangement for power factor correction

A method for power factor correction using a switching circuit arrangement, the method comprising:

• outputting, with a control unit, switching signals to strings via control outputs of the control unit in such a way that a first string is controlled as a master string independently of operation of at least one further string, and the at least one further string is controlled as a slave string depending on operation of the first string,
• wherein the first string is connected to a first control output of the control unit, and the at least one further string is connected to a further control output of the control unit,
• wherein each of the strings contains a power factor correction element,
• each of the power factor correction elements has a power input and a power output,
• the power inputs of the power factor correction elements are connected to a common power input,
• the power outputs of the power factor correction elements connected to a common power output;
• operating, with the control unit, the master string in a transition mode and the at least one slave string either in a transition mode or in a discontinuous mode;
• and
• shortening, with the control unit, a switch-on duration of the at least one slave string with respect to a switch-on duration of the master string.