Jan 212016
 

12VDC to 24VDC step up converter

This 12VDC to 24VDC step up converter is very useful to power devices that run on 24 VDC when we have a 12VDC voltage source as it could be a car battery or alike.

How the 12VDC to 24VDC step up converter works?

The circuit is based on an oscillator made of two NPN bipolar transistors (T1 and T2). The oscillator leads, alternately, the transistor T4 to its cutoff and saturation regions.

The transistor T4 is a N channel MOSFET power transistor with a capacity to conduct a current of up to 18 amps. The coil, which is the element that helps to raise the voltage, must be built on a ferrite core and consists of 100 turns of wire of 1 mm cross section.

12VDC to 24VDC step up converter

The transistor T3 is part of the feedback network and feeds back the output voltage to the gate of the transistor T4, acting when necessary to correct any variation of the output voltage. The output voltage is set with a zener diode D4. This output voltage can be different by changing the zener diode with a different one.

List of circuit components

  • 2  2.2K resistors (R1, R4)
  • 2  1K resistors (R5, R6)
  • 3  4.7K resistors (R2, R3, R7)
  • 1  10K resistor (R8)
  • 2  100 nF capacitor (C1, C3)
  • 1  10 nF capacitor (C2)
  • 1  1000 uF capacitor (C4)
  • 3  BC548 NPN bipolar transistors (T1, T2, T3)
  • 1  N-channel MOSFET power transistor IRF640 (T4)
  • 3  1N4007 semiconductor diodes (D1, D2, D3)
  • 1  24 volt zener diode, 1 watt or more (D4)
  • 1  inductor created as mentioned in the text
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