Power Electronics Dual Converters - Power Electronics

What is the use of dual converters in power electronics?

In a dual converter, two converters will be linked together back to back and they are mostly found in variable speed drives (VFDs). Dual converter operation is described using the diagram below and we can assume that

  • Dual converter is good (gives pure DC output) at its terminals.
  • Each two-quadrant converter will become a controlled DC source in series with a diode.
  • Diodes D1 and D2 will be showing the unidirectional flow of current.

Assume that a dual converter operates without circulating current and the AC current will be banned from flowing by controlled firing pulses. This will make sure that the converter which carries the load current will conduct whereas the other converter will be blocked. This implies that a reactor is not required among the converters.

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Battery Charger

Battery charger also called as a recharger will make use of electric current for storing the energy in a secondary cell and the charging process will be defined by the type and size of the battery. Various types of batteries will be having several tolerance levels for overcharging. Recharging process is attained by connecting it to a constant voltage or constant current source.

Charging Rate (C)

Charging rate can be defined as the rate of charging or discharging a battery and is equal to the battery capacity in one hour. Battery charger can be defined in terms of its charging rate C. For instance, a battery charger with C/10 rating will provide charging capacity in 10 hours whereas one rated 3C will charge a battery in 20 minutes.

Types of Battery Chargers

Below are five main types of battery charges.

  • Simple chargers – this will be operated by providing a constant DC power source into the battery which is getting charged.
  • Fast chargers – fast charges make use of control circuitry for charging the battery rapidly which prevents the battery cells from getting damaged.
  • Inductive chargers – Inductive charges make use of electromagnetic induction for charging the battery.
  • Intelligent chargers – Intelligent charges will be used for charging a battery which includes a chip to communicate with the smart charger.
  • Motion powered charger – motion powered charger will make use of human motion for charging a battery. A magnet placed between two springs will be moved up and down by human motion to charge the battery.

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