"In first place I want to thank God 
by the marvelous hints given by 
the Holy Spirit regarding this 
project, to the glory and 
honor of Jesus Christ." 
 
 
 
 
AN ALMOST IDEAL TRANSFORMER 
In spite of being switched 
 
 
 
Figure 1 
 
In figure 1 is shown an example of An Almost Ideal Transformer - AAIT (from now on). 
 
 
 
Figure 2 
 
In figure 2 is shown from the begining a simulation of the AAIT shown in figure 1. 
  • The output voltage = 11.913 volts 
  • The output current = 170.191 ampers 
  • The no load output voltage is 12 volts so, the equivalent internal resistance is: 
  •  
    R = (12 - 11.913)/170.191 = 0.511 mohm. 
     
  • "A 40V Automotive Grade Single N-Channel HEXFET Power MOSFET in a DirectFET L8 package rated at 270 amperes optimized with low on resistance" is the MOSFET characteristic used in the secondary EXSDC. 
  •  
     
     
  • Congratulations to International Rectifier. 
  •  
    The overall efficiency = € = 2025/2040 = 99.2 %. 
     
  • The AAIT in the example has the primary block separated from the secondary block.  A primary block can feed any number of secondary blocks with equal or different output voltages. 
  • The communication between the primary block and the secondary ones are done with two orthogonal pulses that makes the transfer function from input to output to be continuous; so, 
  • filters are not necessary
     
  • The amplitude of the orthogonal pulses can be any; higher the amplitude smaler the equivalent internal resistance, especially in applications where the load is far from the primary block. 
  • Besides beeing continuous the transfer function from input to output is: 
  •  
    bidirectional. 
     
  • This characteristic is a must for many interesting applications. 
  •  
     
     
     
    Figure 3 
     
    In figure 3 it is shown another version of AAIT fed by a 48 Vpk, 1 KHz  AC voltage source. 
     
     
     
    Figure 4 
     
    In figure 4 it can be seen the the output voltage in red, after the asynchronous demodulation of the orthogonal pulses balanced modulated in amplitude. That is why filters are not necessary. 
    Besides beeing a DCDC transformer the AAIT is an ACAC transformer as well, it responds from DC to ?????. 
     
    Accordingly with what is shown in figure 5 this AAIT is responding to 100 KHz and the switching frequency is only 25 KHz.  How is that possible ????? 
     
     
     
    Figure 5 
     
    I will be extremely glad to acknowledge the right answer!! 
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
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