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2. Power inverter - Wikipedia

   en.wikipedia.org/wiki/Power_inverter

   Modified sine wave 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.

3. 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 ...

4. Frequency changer - Wikipedia

   en.wikipedia.org/wiki/Frequency_changer

   A frequency changer or frequency converter is electronic or electromechanical equipment that converts alternating current of one frequency to alternating current of another frequency. The equipment may also change the voltage , but if it does, that is incidental to its principal purpose, since voltage conversion of alternating current is much ...

5. DC-to-DC converter - Wikipedia

   en.wikipedia.org/wiki/DC-to-DC_converter

   DC-to-DC converters are used in portable electronic devices such as cellular phones and laptop computers, which are supplied with power from batteries primarily. Such electronic devices often contain several sub-circuits, each with its own voltage level requirement different from that supplied by the battery or an external supply (sometimes higher or lower than the supply voltage).