Smps

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Smps

  1. 1. LINEAR  1) Large size & Heavy weight  2) Transformer is Bulky  3) Low Noise * EMI  4) Regulation is 0.1 %  5) High Operating Cost  6) Bulky filter Capacitor SMPS  1) Small size & Light Weight  2) High EMI  3) Small Transformer  4) Medium Filter Cpacitor  5) High Noise  6) Regulation is 0.3 %  7) Low Operating Cost
  2. 2.  It is Placed after surge filter & consist of following components  1) A combination of 4 diodes  This section is used to convert 230VAC to 300 VDC
  3. 3.  1) The electrolytic capacitor of higher voltage capacity  C1=330µ f/ 400v, C2=330µ f/ 400v &  C3=100µ f/ 400v
  4. 4.  The Transistors are fixed on the heat sink and hence easy to identify  There is another pair of driver transistor (small size) which are used to drive switching transistor  The driver transistor & switching transistor are coupled together through a small transformer called Driver Transformer
  5. 5.  A bigger Transformer & is driven from the collector of the switching transistor
  6. 6.  It consists of two groups of diodes
  7. 7.  It consists of inductors & capacitors
  8. 8.  IC TL 494,It is used to generate the pulses of different width.It requires some esternal components like resistors,capacitors and seramic capacitors for generation of pulses
  9. 9.  The switching transistor cannot be driven directly from PWM IC because o/p of PWM IC is very less .Therefore ,we need driver circuit between the switching transistor & PWM IC .  The coupling of power transistor & driver transistor is done through the driver transformer.
  10. 10.  The switching transistor cannot be driven directly from PWM IC because o/p of PWM IC is very less .Therefore ,we need driver circuit between the switching transistor & PWM IC .  The coupling of power transistor & driver transistor is done through the driver transformer.

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