AdvancedA-004-002-007
In a power supply, series chokes will:
D
Answer
Measurements and troubleshooting
Type
A
impede the passage of DC but will pass the AC component
B
impede both DC and AC
C
readily pass the DC and the AC component
D
readily pass the DC but will impede the flow of the AC component
Answer Notes
A choke is essentially an inductor, which consists of a coil of wire. Inductors possess the fundamental property of opposing changes in electrical current. Because direct current (DC) is a steady flow with a frequency of zero, an ideal inductor offers zero reactance and allows DC to pass through with very little resistance.
Conversely, alternating current (AC) or the pulsating AC ripple from a rectifier constantly changes in magnitude and direction. The inductor's reactance heavily opposes these fluctuations, thereby impeding or "choking" the AC component. This makes series chokes highly effective in power supply filters for smoothing pulsating DC into a steady DC output.
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The main function of the bleeder resistor in a power supply is to provide a discharge path for the capacitor in the power supply. But it may also be used for a secondary function, which is to:
Next · A-004-002-008
When using a choke input filter, a minimum current should be drawn all the time when the device is switched on. This can be accomplished by: