Influence of middle tap change on ZVS oscillation circuit

 

§01ZVS Oscillating circuit

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One 、 Intermediate tap inductance

   It was done yesterday ZVS Drive the wireless charging coil In the experiments ,  The inductance of two charging coils with taps in the middle is tested .  But the two coils can not overlap ,  Or perpendicular to each other , That is, there can be no mutual inductance between them .

  
  

   The following shows the process of two coils being perpendicular to each other , The oscillating circuit is still oscillating . Only the oscillation frequency will change . When two coils are vertical , The frequency goes up , When coils overlap , The frequency drops .

  

   This is the schematic diagram of the experimental circuit ,  original B1 It is a transformer with taps in the middle ;  When two coils are vertical ,  They are equivalent to two independent inductors ,  In both cases , The circuit can work .

  

Two 、 Magical oscillation phenomenon

   Use two independent inductors ,  Replace the front charging coil .  There is a strange oscillation in the circuit . That is, when the central power line of the inductor is not connected ,  After the circuit is powered on, it begins to vibrate ,  This situation is really incredible .  So why can this circuit oscillate ？

  
   This is one of the oscillation circuits MOS The voltage waveform of the drain and grid of the tube .

  

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■ Links to related literature :

• Use ZVS Drive the wireless charging coil