09/04/2017

Function of Freewheeling Diode

  • The diode is connected across load in the controlled or uncontrolled converter circuit. This diode is called as freewheeling diode or flywheel diode
half-wave-circuit-using-freewheeling-diode

  • The freewheeling diode is connected across R – L load in the half controlled rectifier circuit as shown in the figure A. 
  • The load current passes through load as the SCR T1 is turned on during positive half cycle of the alternating supply
  • The energy stored in the inductor of the load. 
  • The stored energy of the load passes through freewheeling diode during negative half cycle of the alternating supply. 
  • If there is no freewheel diode, the stored energy of load back to the input supply.


waveform-of-half-wave-controlled-rectifier-with-freewheeling-diode


Function of freewheeling diode

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