page_title: Frequency changer
hierarchical_section_title: Frequency changer
caption_attribution_description: English: Sakuma Frequency. Converter Station. (Sakuma, Tenryu-ku, Hamamatsu-city, Sizuoka-prefecture, Japan) 日本語: 佐久間周波数変換所（静岡県浜松市天竜区佐久間町）
context_page_description: A frequency changer or frequency converter is an electronic or electromechanical device that converts alternating current of one frequency to alternating current of another frequency. The device may also change the voltage, but if it does, that is incidental to its principal purpose, since voltage conversion of alternating current is much easier to achieve than frequency conversion.
  Traditionally, these devices were electromechanical machines called a motor-generator set. Also devices with mercury arc rectifiers or vacuum tubes were in use. With the advent of solid state electronics, it has become possible to build completely electronic frequency changers. These devices usually consist of a rectifier stage which is then inverted to produce AC of the desired frequency. The inverter may use thyristors, IGCTs or IGBTs. If voltage conversion is desired, a transformer will usually be included in either the ac input or output circuitry and this transformer may also provide galvanic isolation between the input and output ac circuits. A battery may also be added to the DC circuitry to improve the converter's ride-through of brief outages in the input power.
context_section_description: A frequency changer or frequency converter is an electronic or electromechanical device that converts alternating current (AC) of one frequency to alternating current of another frequency. The device may also change the voltage, but if it does, that is incidental to its principal purpose, since voltage conversion of alternating current is much easier to achieve than frequency conversion.
  Traditionally, these devices were electromechanical machines called a motor-generator set. Also devices with mercury arc rectifiers or vacuum tubes were in use. With the advent of solid state electronics, it has become possible to build completely electronic frequency changers. These devices usually consist of a rectifier stage (producing direct current) which is then inverted to produce AC of the desired frequency. The inverter may use thyristors, IGCTs or IGBTs. If voltage conversion is desired, a transformer will usually be included in either the ac input or output circuitry and this transformer may also provide galvanic isolation between the input and output ac circuits. A battery may also be added to the DC circuitry to improve the converter's ride-through of brief outages in the input power.
  Frequency changers vary in power-handling capability from a few watts to megawatts.
caption: The Sakuma frequency converter station is one of the stations that links Japan's two grids (see Electricity sector in Japan § Transmission).
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