Electronic Devices

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Author:
jnnc120
ID:
64616
Filename:
Electronic Devices
Updated:
2011-02-07 08:07:12
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devices
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Description:
Chapter 2
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  1. Define: Clamper
    A circuit that adds a dc level to an ac voltage using a diode and a capacitor.
  2. Define: DC power supply
    A circuit that converts ac line voltage to dc voltage and supplies constant power to operate a circuit or system.
  3. Define: Filter
    In a power supply, the capacitor used to reduce the variation of the output voltage from a rectifier.
  4. Define:Full-wave rectifier
    A circuit that converts an ac sinusiodal input voltage into a pulsating dc voltage with one output pulse occurring for each input cycle.
  5. Define: Half-wave rectifier
    A circuit that converts an ac sinusiodal input voltage into a pulsating dc voltage with one output pulse occurring for each input cycle.
  6. Define: Limiter
    A diode circuit that clips off or removes part of a waveform above and/or below a specified leve.
  7. Define: Line regulation
    The change in output voltage of a regulator for a given change in input voltage.
  8. Define: Load Regulation
    The change in output voltage of a regulator for a given range of load currents, normally expressed as a percentage.
  9. Define: Peak inverse voltage(PIV)
    The maximum value of reverse voltage across a diode that occurs at the peak of the input cycle when the diode is reverse-biased.
  10. Define: Rectifier
    An electronic circuit that converts ac into pusating dc; one part of a power supply.
  11. Define: Regulator
    An electronic device or circuit that maintains an essentially constant output voltage for a range of input voltage or load values; one part of a power supply
  12. Define: Ripple voltage
    The small variation in the dc ouput voltage of a filtered rectifier caused by the charging and discharging of the filter capacitor.
  13. Define: Troubleshooting
    A systematic process of isolating, identifiying, and correcting a fault in a circuit or system.
  14. A dc power supply typically consists of what four things?
    transformer, diode rectirfier, filter, regulator
  15. THe output frequency of a half-wave rectifier equals?
    the input frequency
  16. What is (PIV)-Peak Inverse Voltage?
    the maximum voltage appearing across the diode in reverse bias.
  17. How much is output frequency of a full-wave rectifier?
    it's twice the input frequency
  18. What are two basic types of full-wave rectifiers?
    center-tapped and bridge
  19. What is the peak output voltage of a center-tapped full-wave rectifier?
    approximately one-half of the total peak secondary voltage less one diode drop
  20. What is the peak output voltage of a bridge rectifier?
    equals the total peak secondary voltage less two diode drops
  21. What equals the PIV for each diode in a bridge rectifier?
    is approximately half that required for an equivalent center-tapped configuration and is equal to the peak output voltage plus one diode drop.
  22. What does the capacitor-input filter provide?
    a dc output approximately equal to the peak of its rectified input voltage.
  23. The smaller the ________,
    the better the _________.
    • ripple voltage
    • filter
  24. What is the input or line regulation?
    Regulation of output voltage over a range of input voltages.
  25. What is load regulation?
    Regulation of output voltage over a range of load currents.
  26. What are clippers?
    Diode limiters or clippers cut off voltage above or below specified levels.
  27. What are Diode clampers?
    they add a dc level to an ac voltage
  28. What are voltage multipliers?
    they are used in high-voltage, low-current applications such as for electron beam acceleration in CRTs and for particle accelerators.
  29. What does a voltage multiplier use?
    it uses a series of diode-capacitor stages

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