A Useful 150W Boost DC-DC Power Supply

Basic Description and Specifications

Boost Converter PictureI’ve used these a bunch. At less than ten bucks, its a great little tool for fast prototypes, experiments and one off projects.

Basically,  you’re able to take a lower voltage and convert it to a higher voltage.

In technical jargon it is referred to as a dc to dc boost (or step up) converter.

 

Where to Find This Boost Converter

The boost converter pictured can be found at nearly all of the major online electronics vendors.

eBay

Deal Extreme

Amazon

 

Input and Output Voltage Considerations

This particular model expects to see an input between 10 to 32 volts and will convert it to 12 to 35 Volts.

The rule of thumb here is that your input voltage must be lower than your output voltage. For example, if you want a 24 volt output, you will want less than 24 volt input.

Current Considerations (Efficiency)

Consideration should also be given to the power capacity of your input power source. If you’re using a 12 volt source to create 24 volts at 2 amps, you will be consuming about 50 Watts (

Power in Watts = Voltage x Current in Amps

The temptation may be to believe that all you need to do is provide about 4 amps of current at 12 Volts. That’s not true.

Power conversion involves losses or efficiency. The higher the loss, the lower efficiency. The lower the loss, the higher the efficiency.

For example, if I lost 10 percent of the power in conversion, the device would be considered 90 percent efficient.

Because the efficiency specifications on this device are not documented, I choose to be conservative in my estimation of it’s efficiency and thus consider it to be an 80 percent efficient circuit.

It makes things safer and a heck of a lot more fun when you’re not burning down the house.

Now, what all this means is that if I want 50 watt as an output, I will ensure that my input source is capable of providing at least 62.5 Watts. ( 50/62.5 = 0.8 ).

Current Output Limitations

Remember this a 150W watt supply,  thus your output current limitations will be directly tied to the voltage you select as an output.

For example, if you choose 35 Volts as an output, you are limited to about 4.2 amps.

On the other hand, if 18 volts is where you need to be, you’ve got about 8.3 amps.

My conservative nature again… In my designs, I will treat this as 120W boost converter.  Even though this is advertized as a 150 Watt supply, I derate it.

This may in fact be a 150W supply, but that’s under a certain set of conditions.   Absent a specification sheet of some sort,  I have no idea what these conditions are.

Though it really doesn’t come with instructions, it is pretty easy to use.  The illustration below says it all.

Boost Converter Pin Outs

5 Comments

  1. capnfatz@gmail.comAuthor March 17, 2017
  2. capnfatz@gmail.comAuthor March 17, 2017
  3. Abdul Sathar A March 17, 2017
  4. Abdul Sathar A March 17, 2017
  5. AKA_Scool January 11, 2017

Add a Comment

Your email address will not be published. Required fields are marked *