USEFUL NOTES

Methods of determining secondary current ratings in D.C. circuits

Half Wave Rectifier ( HWR )
 
  • Innefficient, DC flux component
  • Use generally for 0.5 watt or less


Without Capacitor

  • VAC = 2.2 x ( VDC +1 )
  • IAC = 1.6 x IDC
  • WATTS = VDC x IDC (output)
  • VA = 3.5 x ( WATTS + IDC)


 With capacitor

  • VAC = 0.88 x ( VDC +1 )
  • IAC = 2.6 x IDC
  • WATTS = VDC x IDC (output)
  • VA = 2.3 x ( WATTS + IDC)

Click to enlarge
 
Full Wave Center Tap ( FWCT )
 
  • More efficient, although secondary not fully utilized
  • Preffered in very low voltage supplies where extra diode voltage drops unwanted


Without Capacitor

  • VAC = 2.2 x ( VDC +1 )
  • IAC = 0.8 x IDC
  • WATTS = VDC x IDC (output)
  • VA = 1.4 x ( WATTS + IDC)
  • With capacitor
  • VAC = 1.7 x ( VDC +1 )
  • IAC =0.8 X IDC
  • WATTS = VDC x IDC
  • VVA = 1.4 x ( WATTS + IDC)

Click to enlarge
 
Full wave bridge ( FWB )
 
  • Most efficient, secondary is fully utilized
  • Preffered for smallest transformer size and cost at higher voltages

Without capacitor

  • VAC = 1.1 x ( VDC +2 )
  • IAC = 1.1 x IDC
  • WATTS = VDC x IDC (output)
  • VA = 1.2 x ( WATTS + 2XIDC)
  • With capacitor
  • VAC = 0.8 x ( VDC + 2 )
  • IAC =1.8 X IDC
  • WATTS = VDC x IDC (output)
  • VA = 1.4 x ( WATTS + 2XIDC)

Click to enlarge
 
Dual complementary rectifies  (DCR )
 
  • Most efficient, when load is balanced
  • Provides (+) and (-) with a common ground

Without capacitor

  • VAC = 1.1 x ( VDC +2 )
  • IAC = 1.1 x IDC
  • WATTS = VDC x IDC (output)
  • VA = 1.2 x ( WATTS + 2XIDC)

With capacitor

  • VAC = 0.8 x ( VDC + 2 )
  • IAC =1.8 X IDC
  • WATTS = VDC x IDC (output)
  • VA = 1.4 x ( WATTS + 2 IDC)

Click to enlarge
 
Adding a regulator
 

Click to enlarge
  • VDC= (VOUT + VREG + VRIPPLE ) x VNOMINAL LINE / VLOW LINE ;
  • Usually VREG >= 3 V, VRIPPLE = 10% x VDC

Click to enlarge
 
  
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