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Switching DC Power Supplies
Most DC power supplies are designed to meet some or all of the following requirements:

  1. Regulated output - constant output voltage Within a specified range in the input voltage and the output load current, the average output voltage changes within a specified tolerance and the output ripple voltage is below a specified value.
  2. Isolation - electrical isolation between input and output The electrical isolation is referred to the DC isolation.
  3. Multiple outputs - The multiple outputs can differ in voltage polarities, voltage ratings and current ratings.
Common targets for DC power supply design:
  1. Small size (transformer, heatsink, filter capacitor)
  2. Light weight (transformer)
  3. High efficiency
  4. Low construction cost
Power Supply
      Unregulated DC power supplies: diode bridge rectifiers
      Regulated DC power supplies can be divided into two types:
      1. Linear power supplies - the power semiconductor devices act as adjustable series resistors (operated in active region)
      2. Switching power supplies - the power semiconductor devices act as switches (either completely on or completely off)
      Phase-controlled bridge rectifiers can be used as regulated DC power supplies but their output voltage response times (against input rms voltage or load change) are relatively slow.
      Electrical isolation: use transformers
      next Linear Power Supplies
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