Hello everyone,

I am facing an issue here in building boost converter for RF harvesting circuit. My input for the boost converter is 0.6V and I am aiming to get an output voltage of 1.8V, however, for the simulation result I get 0.27V which lower than my input voltage. If my calculation for duty cycle, inductance, capacitance, and other values are correct, what are the possible problem to my circuit. Thanks for helping...

 

Suggest you should have looked at the data sheet for the MOSFET before you designed the circuit (below):
Obviously 0.6V is not enough to fully turn it on.

 

Gate voltage of 0.5 to 1.1 will turn in the MOSFET to 10uA of Drain current. 10uA not mA not A.

What is giving you 0.6V at 1A?

 

What is giving you 0.6V at 1A?

Likely because he plans on driving it with the source voltage.

 

because

I think it is energy harvesting. I see too many people think a boost converter makes energy.

 

Suggest you should have looked at the data sheet for the MOSFET before you designed the circuit (below):
Obviously 0.6V is not enough to fully turn it on.

View attachment 326327

Does that mean with input voltage of 0.6 only i can't use a boost converter with this circuit design?

 

Do you guys know any MOSFET that I can find in Multisim to work with 0.6V?

 

Gate voltage of 0.5 to 1.1 will turn in the MOSFET to 10uA of Drain current. 10uA not mA not A.

What is giving you 0.6V at 1A?

Sorry, but I dont understand

 

Sorry, but I dont understand

crutschow shows part of the data for that MOSFET. The "Gate Threshold Voltage" is shown for that part. Many people think this is the turn on voltage but it is not really. An average voltage is "0.8" but it could be anywhere from 0.5 to 1.1. Data sheets often give numbers as min/typical/max. At the "Gate Threshold Voltage" the MOSFET is just thinking about turning on. Not really on. In this case 10uA. Not full current. You need more like 5V to get the part to turn on well. You must find a Gate Drive signal of at least 5V. (some parts will work to 3V).

Change V3 to 5V and see what happens.

 

crutschow shows part of the data for that MOSFET. The "Gate Threshold Voltage" is shown for that part. Many people think this is the turn on voltage but it is not really. An average voltage is "0.8" but it could be any where from 0.5 to 1.1. Data sheets often give numbers as min/typical/max. At the "Gate Threshold Voltage" the MOSFET

okay I se thank you

 

Power, consumed from V2 equal 2.5 mW.

 

View attachment 326410
Power, consumed from V2 equal 2.5 mW.

Thank you! I will try it out

 

Look up the Joule thief circuit - and find a transistor ( BJT ) that will operate with 0.4V on the base - there are some high gain ones that meet this spec - a very slight modification of the joule thief gives a boost converter - regulation can be achieved by ON - OFF control.