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in electric power engineering, the conversion of direct electric current to single-phase or polyphase alternating current by means of a device that consists of controlled electric valves. Inverting is the reverse of rectifying.
Inverter circuits with several electric valves are used in practice. The power losses in inverting depend on the voltage drop Δ U in the valves. The ratio of power losses in the valves to the useful converted power is approximately equal to Δ U/U, where U is voltage of the DC power supply. In mercury valves Δ U does not exceed several dozen volts. For DC voltages of several kilo-volts the inverting losses in valves are less than 1 percent. The losses in other parts of the circuit (chokes, capacitors, and control circuits) usually do not exceed a few percent. The total efficiency of inverting is usually above 90 percent.