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  2. Selenium rectifier - Wikipedia

    en.wikipedia.org/wiki/Selenium_rectifier

    An 8-plate 160 V 450 mA Federal brand selenium rectifier. A selenium rectifier is a type of metal rectifier, invented in 1933. [1] They were used in power supplies for electronic equipment and in high-current battery-charger applications until they were superseded by silicon diode rectifiers in the late 1960s.

  3. Metal rectifier - Wikipedia

    en.wikipedia.org/wiki/Metal_rectifier

    A number of rectifier discs would need to be used in series to provide an adequate reverse breakdown voltage figure – a bridge rectifier for a 12V battery charger would often use 12 metal rectifiers. Selenium rectifiers were generally more efficient than metal-oxide types, and could handle higher voltages.

  4. Rectifier - Wikipedia

    en.wikipedia.org/wiki/Rectifier

    If the three-phase bridge rectifier is operated symmetrically (as positive and negative supply voltage), the center point of the rectifier on the output side (or the so-called isolated reference potential) opposite the center point of the transformer (or the neutral conductor) has a potential difference in the form of a triangular common-mode ...

  5. Reference designator - Wikipedia

    en.wikipedia.org/wiki/Reference_designator

    Bridge rectifier (four diodes in a package) often changed to "D" for diode BT, BAT: Battery or battery holder: often shortened to "B" C: Capacitor: CB: Circuit breaker: CN: Capacitor network: may be simplified to "C" for capacitor D, CR: Diode (all types, including LED), thyristor "D" is preferred for various types of diodes DL: Delay line: DN ...

  6. Bridge circuit - Wikipedia

    en.wikipedia.org/wiki/Bridge_circuit

    In power supply design, a bridge circuit or bridge rectifier is an arrangement of diodes or similar devices used to rectify an electric current, i.e. to convert it from an unknown or alternating polarity to a direct current of known polarity. In some motor controllers, an H-bridge is used to control the direction the motor turns.

  7. Mercury-arc valve - Wikipedia

    en.wikipedia.org/wiki/Mercury-arc_valve

    Mercury rectifier on display in the Beromünster AM transmitter in Switzerland, before being decommissioned.Three-phase full-wave rectifier with six anodes. A mercury-arc valve or mercury-vapor rectifier or (UK) mercury-arc rectifier [1] [2] is a type of electrical rectifier used for converting high-voltage or high-current alternating current (AC) into direct current (DC).

  8. Company behind incorrect Los Angeles alert says it added new ...

    www.aol.com/company-behind-incorrect-los-angeles...

    The company behind Los Angeles' emergency alert technology said it has added safeguards to prevent further inaccurate wildfire evacuation alerts from being sent to residents amid deadly ...

  9. Power electronics - Wikipedia

    en.wikipedia.org/wiki/Power_electronics

    In 1933 selenium rectifiers were invented. [1] ... Single-phase VSIs utilize half-bridge and full-bridge configurations, and are widely used for power supplies ...

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