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2. Voltage converter - Wikipedia

   en.wikipedia.org/wiki/Voltage_converter

   A transformer would be used for higher power. Transformers do not change the frequency of electricity; in many regions with 100–120 V, electricity is supplied at 60 Hz, and 210–240 V regions tend to use 50 Hz. This may affect operation of devices which depend on mains frequency (some audio turntables and mains-only electric clocks, etc ...

3. Electric power conversion - Wikipedia

   en.wikipedia.org/wiki/Electric_power_conversion

   Aircraft often use 400 Hz power internally, so 50 Hz or 60 Hz to 400 Hz frequency conversion is needed for use in the ground power unit used to power the airplane while it is on the ground. Conversely, internal 400 Hz internal power may be converted to 50 Hz or 60 Hz for convenience power outlets available to passengers during flight.

4. Power inverter - Wikipedia

   en.wikipedia.org/wiki/Power_inverter

   Waveform produced by a cigarette lighter 12 volt DC to 120 V AC 60 Hz inverter. The modified sine wave is the sum of two square waves, one of which is delayed one-quarter of the period with respect to the other. The result is a repeated voltage step sequence of zero, peak positive, zero, peak negative, and again zero.

5. Frequency changer - Wikipedia

   en.wikipedia.org/wiki/Frequency_changer

   Frequency changers are used for converting bulk AC power from one frequency to another, when two adjacent power grids operate at different utility frequency.. A variable-frequency drive (VFD) is a type of frequency changer used for speed control of AC motors such as used for pumps and fans.

6. AC-to-AC converter - Wikipedia

   en.wikipedia.org/wiki/AC-to-AC_converter

   An AC-AC converter with approximately sinusoidal input currents and bidirectional power flow can be realized by coupling a pulse-width modulation (PWM) rectifier and a PWM inverter to the DC-link. The DC-link quantity is then impressed by an energy storage element that is common to both stages, which is a capacitor C for the voltage DC-link or ...

7. HVDC converter - Wikipedia

   en.wikipedia.org/wiki/HVDC_converter

   Three-level converters can synthesize three (instead of only two) discrete voltage levels at the AC terminal of each phase: + ⁠ 1 / 2 ⁠ U d, 0 and - ⁠ 1 / 2 ⁠ U d. A common type of three-level converter is the diode-clamped (or neutral-point-clamped ) converter, where each phase contains four IGBT valves, each rated at half of the DC ...