How to Build a 3V to 5V DC-DC Boost Converter with Discrete Components?

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Discussion Overview

The discussion revolves around building a 3V to 5V DC-DC boost converter using discrete components, specifically without the use of switches. Participants explore various circuit designs and component suggestions while addressing challenges faced in constructing the converter.

Discussion Character

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

Main Points Raised

  • One participant expresses a lack of understanding in building a boost converter and requests help with specific component choices and circuit design.
  • Another participant suggests connecting a 2V battery in series with a 3V battery, although this may not align with the constraints of using only two 1.6V batteries.
  • A participant shares their previous attempt at building the circuit and questions whether the component values used were appropriate, listing specific components they tried.
  • One participant mentions their experience with a different type of DC-DC converter, indicating a long history with similar projects but not directly addressing the current question.
  • Questions arise regarding the calculation of component values necessary for boosting the voltage effectively.
  • A participant inquires about the operation of the timing circuit and its effect on the transistor, suggesting the need for further testing with a scope to observe component behavior.
  • Another participant proposes an alternative approach using an astable multivibrator tied to a voltage doubler, claiming it requires no inductors.
  • There is a note about a missing circuit attachment that could provide additional context for the proposed solution.
  • A link to an external instructable is shared as a potential resource for building a similar circuit.

Areas of Agreement / Disagreement

Participants express various ideas and suggestions, but there is no consensus on a specific solution or approach to building the boost converter. Multiple competing views and methods are presented without resolution.

Contextual Notes

Participants mention specific component values and configurations, but there are unresolved questions regarding the appropriateness of these choices and the overall circuit design. The discussion includes assumptions about the load and circuit behavior that remain unverified.

SanGaL
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hi everyone :smile:

i am a 2nd year engineering student...i have a problem here... :confused: i was asked to build a 3V to 5V dc-dc boost converter but i have no idea how to build it... i have search all over the webs but the information they gave me ain't what i want.

i was asked to build a step up from 3V to 5V converter using only discreet components. I can't uses switches too... :frown: The current must be within 30mA.

I would appreciate it very much if anyone can help me... :wink:

Thankz :biggrin:
 
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Take a 3V battery and connect a 2V battery in series.
 
i can only use two 1.6V batteries in the circuit.
 
http://www.powerdesigners.com/InfoWeb/design_center/articles/DC-DC/converter.shtm . This help?
 
Last edited by a moderator:
hehe... I've tried building this circuit already but don't know why it can't work.
is it because of the values i use for the components?
i've used:
1)150uH inductor
2)BC817-25 transistor
3)0.47uF cap
4)BAS85 diode

can give suggestions on what components i can use?
Thanz =)
 
Got me there. My experience consists in building a capacitive discharge ignition system from a kit forty years ago that had a 12 to 400V dc-dc converter in it. Put out a hell of a spark--actually advanced the timing.
 
Then how can i calculate the values of the components i need to boost the voltage from 3V to 5V??
 
Are you certain your timing circuit is sending pulses to the transistor that saturate it?

How much of a load are you placing across the outputs of the boost converter?

What does the behavior across the components look like on a scope?

Cliff
 
try this i requires no inductors

I was searching for a single component to do this and ran across your request.
Try the attached circuit. It is an astable multivibrator tied to a voltage doubler.
It's very straight forward.
Mayj
 
  • #10
MAYJ said:
I was searching for a single component to do this and ran across your request.
Try the attached circuit. It is an astable multivibrator tied to a voltage doubler.
It's very straight forward.
Mayj
This thread is going to be 3 years old soon.

BTW, you forgot to attach the circuit for those who may interested in it.
 

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