Troubleshooting a Boost Converter Circuit

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Discussion Overview

The discussion revolves around troubleshooting a boost converter circuit designed to increase voltage from 4 volts to 8 volts. Participants explore various aspects of the circuit, including component specifications, switching frequency, and potential issues affecting performance. The conversation includes technical explanations, debugging strategies, and schematic corrections.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Exploratory
  • Homework-related

Main Points Raised

  • One participant reports a voltage reading of 0.36 volts instead of the expected output, indicating a potential issue with the circuit.
  • Another suggests that the switching frequency of 1204 Hz might be too low for effective operation of the boost converter.
  • Some participants propose increasing the switching frequency to improve output voltage.
  • Concerns are raised about the inductor's inductance and saturation current, with suggestions to measure these values if possible.
  • Participants discuss the importance of correctly connecting the diode in the circuit to prevent damage to the transistor.
  • One participant describes the expected operation of the boost converter, detailing the behavior of the inductor and diode during switching.
  • There are multiple requests for correct schematic diagrams and clarifications on circuit connections.
  • Some participants express uncertainty about the understanding of boost converter topology and connections.
  • One participant mentions using nine inductors in series to achieve a desired inductance, reflecting a trial-and-error approach.

Areas of Agreement / Disagreement

Participants express differing views on the correct schematic and operation of the boost converter. There is no consensus on the specific issues causing the circuit to malfunction, and multiple competing explanations are presented throughout the discussion.

Contextual Notes

Participants note limitations in their ability to measure certain parameters, such as inductance and current, which may hinder troubleshooting efforts. There are also references to potential errors in the schematic and component connections that could affect circuit performance.

Who May Find This Useful

This discussion may be useful for individuals interested in electronics, particularly those working with DC-DC converters or troubleshooting similar circuits.

  • #31
The diode that stops the capacitor discharging is missing. It goes between the transistor and capacitor.
 
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  • #32
i did include a diode in the circuit. i forgot to draw the diode in the schematic. it is a 1n4004 diode. why is the circuit not working?
 
  • #33
Yes, the TIP36c is a PNP transistor. You have drawn an NPN transistor, and you need an NPN transistor in your circuit (although most circuits use an N-channel MOSFETS these days).
 
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  • #34
and i put it between the transistor and capcitor.
 
  • #35
why won't a pnp transistor work?
 
  • #37
David lopez said:
and i put it between the transistor and capcitor.

The right way around ?

redraw you circuit
 

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