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 

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