Method for setting switching times, in particular idle times, of an inverter based on detected power, and inverter

A method for a solar inverter for feeding current produced by a d.c. voltage source formed by a solar module into an a.c. voltage grid comprising the steps of:

• (a) chopping the current produced by the d.c. voltage source in a form of a pulse width modulation by a bridge inverter by alternate switching of switching elements connected in parallel and connected in series;
• (b) transmitting the current chopped via a transformer connected between the switching elements that are connected in series, the transformer having a primary winding;
• and
• (c) rectifying the current transmitted and feeding the current into the a.c. voltage grid via a buck chopper;
• wherein, for a power adaptation, the switching times of the switching elements of the bridge inverter are controlled, or regulated;
• wherein the current produced by the d.c. voltage source is detected from current flowing over the primary winding of the transformer continuously or at cyclical intervals, and
• wherein a dead time of the switching elements of the bridge inverter is set as a function of the mean value of the detected current of the d.c. voltage source flowing over the primary winding of the transformer by selecting the dead time from a table with correspondingly stored data for the most varying mean values, the dead time representing a time of the switching elements for switching over from one switching element to a further switching element connected in series of the bridge inverter, thereby ensuring that parasitic capacitances stored in the switching elements of the bridge inverter can be completely recharged and no excessively long switching pauses can occur at the same time.