A battery charger acts like a __________.

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 1
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  1. converter
  2. rectifier
  3. cycloconverter
  4. chopper

Answer (Detailed Solution Below)

Option 2 : rectifier
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  • A battery charger is a DC power supply source. Here a transformer is used to step down the AC mains input voltage to the required level as per the rating of the transformer.
  • This transformer is always a high-power type and is able to produce a high current output as required by most lead-acid batteries.
  • A bridge rectifier configuration is used to rectify the low voltage AC into DC i.e. Rectifier is a device that converts AC into DC and is further smoothed by a high-value electrolytic capacitor.
  • This DC is fed to an electronic circuit which regulates the voltage into a constant level and is applied to the battery under charge, where the energy is stored through an internal process of the chemical reaction.
  • In automatic battery chargers, a voltage sensor circuit is incorporated to sense the voltage of the battery undercharges. The charger is automatically switched OFF when the battery voltage reaches the required optimum level.
  • Chopper is used to convert fixed dc to variable dc.
  • Cyclo-convertor is a device that converts AC power at one frequency into AC power of adjustable but lower frequency without any DC current or DC stage in between.
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