**Building a Boost Converter from Scratch**

The first step in building a boost converter is to create a voltage divider on the output, which feeds into the inverting input of a differential op amp configuration. This means that since we have a constant voltage reference on the non-inverting inputs, the output voltage will be the reference voltage subtracted by the feedback voltage of the boost converter. To achieve this, I used a 100 kilo ohm resistor and a 10 kilo ohm resistor in series with a 1 kilo ohm trimmer to create a stable 2.49V reference voltage that stays constant even when the input voltage of the circuit varies.

**Creating a Stable Reference Voltage**

To ensure a stable reference voltage, I used a TL for 3/1 in series with a 1 kilo ohm resistor. This setup creates a stable 2.49V voltage level that can be adjusted as needed. The non-inverting inputs of the differential op amp configuration are set to a constant voltage of 2.4V and 95V, respectively, which means that the inverting input should not be higher than these voltage levels. To achieve this, I created my voltage divider using a 100 kilo ohm resistor and a 10 kilo ohm trimmer.

**Connecting the Components**

Once the components were prepared, it was time to connect them together according to the schematic on a breadboard. Due to the large number of necessary components, this process took quite some time, but once complete, I powered up and adjusted the triangle voltage with the two potentiometers so that it stretched perfectly between the zero volts and 2.5V.

**Powering Up and Testing**

After adjusting the output trimmer, the boost converter was ready to use. However, due to the unpredictable nature of breadboard circuits, it did not work as expected. To ensure that the circuit really works without problems, I assembled it once again on a piece of perfboard, which eliminated loose connection problems and unwanted parasitic capacitances.

**Proper Testing**

After completing the assembly on the perfboard, it was time for the proper testing session. As you can see from the video, adjusting the output voltage is possible with the output trimmer, and by increasing/decreasing the input voltage, the duty cycle of the MOSFETs decreased/increased, which means that the output voltage stayed almost constant.

**Conclusion**

While it is possible to create a boost converter without a microcontroller, I would still recommend using one. The number of components required was significantly higher than necessary, and extending the functionality of such a circuit will always be easier to accomplish with a microcontroller. Nevertheless, I hope you enjoyed watching this video, and if so, don't forget to like, show, and subscribe. Stay creative and I'll see you next time!

WEBVTTKind: captionsLanguage: enwhat you see here is a so-called boost converter that I built in a previous video back then I explained in detail the job of each component in the circuits so that the final product was capable of boosting a low fifoota ch2 a high 30 volt voltage and even keep the output voltage stable when d low changes this was possible because the ad tiny microcontroller constantly monitored the output voltage and increased the duty cycle when more current on the output was necessary and decreased the duty cycle when less current was necessary I have to say that it was a decent boost converter prototype but as always when creating my controller projects people started asking whether designing a boost converter without a microcontroller is possible so in this episode of we can create circuits without a microcontroller but usually that does not make a whole lot of sense I will try to create my own boost converter without utilizing any kind of microcontroller and show you that using one instead would have made things a lot easier let's get started this video is sponsored by jlc PCB one fact about them customers can track every PCB production process through their online accounts upload your Gerber files to order professional PCBs for only $2.00 the classical circuits for boost converter looks like this when the MOSFET is turned on the coil builds up its magnetic fields and once the MOSFET is turned off this energy is pumped into the output capacitor and loads in order to boost the voltage pretty standard stuff if I would build up the circuits with some off-the-shelf components and control the MOSFETs through its gates with a MOSFET driver and a function generator which creates a PWM signal then we can see that by varying the duty cycle we can create a variable boosted output voltage but as soon as I either increase / decrease the input voltage or change the load on the outputs the output voltage does not stay stable because our system does not have a feedback system yet to change that let's have a closer look at this pre-made boost converter circuits that you can get for cheap on eBay if we inspect the main I see under the microscope then we can reach PA six to eight five which after a bit of googling turns out to be a MT r-36o eights boost converter I see that only requires a minimum of external components to function properly and by having a closer look at its functional block diagram we can kind of assume it's functional principle but to make things even easier I will be using this article from maximum integrated as a base for my own boost converter first off we need to build a voltage divider on the outputs which feeds into the inverting input of a differential op amp configuration that means since we got a constant voltage reference on the non-inverting inputs that the output voltage will be the reference voltage subtracted by the feedback voltage of the boost converter later I will be using a TL for 3/1 in series with a 1 kilo ohm resistor in order to create a stable 2.49 5 volts reference voltage which stays constant even when the input voltage of the circuit varies because of the 2.4 95 voltage limits at the non-inverting inputs the voltage at the inverting input should not be higher than that so I created my voltage divider from a 100 kilo ohm and 10 kilo ohm resistor and a 10 kilo ohm trimmer this way we would get a 2.5 volt voltage drop across the tumor at the maximum output voltage of 30 volts next this resultant error voltage fits into the non-inverting input of a comparator while the inverting input of the comparator is connected to ramp oscillator that creates a triangle voltage that means whenever the error voltage is lower than the triangle voltage the output of the comparator is connected to ground and whenever the error voltage is higher than the trying the voltage the output is connected to VCC which consequently creates a PWM signal which will control our MOSFETs at this point you might be asking yourself how does the set up at the feedback functionality well let's imagine we got a constant voltage of 15 volts at the outputs and now we add a resistor in parallel which would obviously draw more current on the outputs since the duty cycle is not adjusted yet the output voltage would agree s' which means the feedback voltage would decrease as well this on the other hand means that the error voltage will increase and thus the time the error voltage is higher than the triangle voltage becomes longer as well which ultimately means that the duty cycle increases and thus the initially targeted output voltage would get sustained pretty smart I would say and with this design guideline in mind I created an appropriate schematic mainly consisting of two rail-to-rail op amps and a TC of 44:20 MOSFET driver which together form a triangle generator a differential op amp configuration and a comparator which controls the MOSFET driver and thus the MOSFETs and once the schematic was complete I began connecting all the components to one another according to the schematic on a breadboard which due to the rather big number of necessary components took quite a while but as soon as I was done creating the circuits I powered up and adjusted D create a triangle tidge with the two potentiometers so that it stretches perfectly between the zero volts and 2.5 volts a voltage level that adjustment then basically made the boost converter ready to use which as you can see it did work somehow but due to the unpredictable nature of breadboard circuits it was not a usable boost converter yet so to make sure that the circuit really does work without a problem I assembled it once again on a piece of proof port which did get rid of loose connection problems and unwanted parasitic capacitances and after two hours of soldering the circuit was complete and after the power up and once again adjusting the triangle voltage it was time for proper testing session as you can see adjusting the output voltage is possible with the output trimmer and by increasing / decreasing the input voltage the duty cycle of the MOSFETs cut decreased / increased which means the output voltage stayed almost constant and as expected by changing the output loads the voltage can also decently sustain its constant level but please do not think that this circuit is flawless there were in fact a couple of weird problems which means that in case you want to build your own boost converter I would still recommend the microcontroller version or a version of pulled around a simple switch IC so the conclusion of the initial question is yes of course you can create a boost converter without the microcontroller but look at how much more components were required and extending the functionality of such a circuits will always be easier to accomplish with a microcontroller but anyway I hope you enjoyed watching this video if so don't forget to like show and subscribe stay creative and I will see you next timewhat you see here is a so-called boost converter that I built in a previous video back then I explained in detail the job of each component in the circuits so that the final product was capable of boosting a low fifoota ch2 a high 30 volt voltage and even keep the output voltage stable when d low changes this was possible because the ad tiny microcontroller constantly monitored the output voltage and increased the duty cycle when more current on the output was necessary and decreased the duty cycle when less current was necessary I have to say that it was a decent boost converter prototype but as always when creating my controller projects people started asking whether designing a boost converter without a microcontroller is possible so in this episode of we can create circuits without a microcontroller but usually that does not make a whole lot of sense I will try to create my own boost converter without utilizing any kind of microcontroller and show you that using one instead would have made things a lot easier let's get started this video is sponsored by jlc PCB one fact about them customers can track every PCB production process through their online accounts upload your Gerber files to order professional PCBs for only $2.00 the classical circuits for boost converter looks like this when the MOSFET is turned on the coil builds up its magnetic fields and once the MOSFET is turned off this energy is pumped into the output capacitor and loads in order to boost the voltage pretty standard stuff if I would build up the circuits with some off-the-shelf components and control the MOSFETs through its gates with a MOSFET driver and a function generator which creates a PWM signal then we can see that by varying the duty cycle we can create a variable boosted output voltage but as soon as I either increase / decrease the input voltage or change the load on the outputs the output voltage does not stay stable because our system does not have a feedback system yet to change that let's have a closer look at this pre-made boost converter circuits that you can get for cheap on eBay if we inspect the main I see under the microscope then we can reach PA six to eight five which after a bit of googling turns out to be a MT r-36o eights boost converter I see that only requires a minimum of external components to function properly and by having a closer look at its functional block diagram we can kind of assume it's functional principle but to make things even easier I will be using this article from maximum integrated as a base for my own boost converter first off we need to build a voltage divider on the outputs which feeds into the inverting input of a differential op amp configuration that means since we got a constant voltage reference on the non-inverting inputs that the output voltage will be the reference voltage subtracted by the feedback voltage of the boost converter later I will be using a TL for 3/1 in series with a 1 kilo ohm resistor in order to create a stable 2.49 5 volts reference voltage which stays constant even when the input voltage of the circuit varies because of the 2.4 95 voltage limits at the non-inverting inputs the voltage at the inverting input should not be higher than that so I created my voltage divider from a 100 kilo ohm and 10 kilo ohm resistor and a 10 kilo ohm trimmer this way we would get a 2.5 volt voltage drop across the tumor at the maximum output voltage of 30 volts next this resultant error voltage fits into the non-inverting input of a comparator while the inverting input of the comparator is connected to ramp oscillator that creates a triangle voltage that means whenever the error voltage is lower than the triangle voltage the output of the comparator is connected to ground and whenever the error voltage is higher than the trying the voltage the output is connected to VCC which consequently creates a PWM signal which will control our MOSFETs at this point you might be asking yourself how does the set up at the feedback functionality well let's imagine we got a constant voltage of 15 volts at the outputs and now we add a resistor in parallel which would obviously draw more current on the outputs since the duty cycle is not adjusted yet the output voltage would agree s' which means the feedback voltage would decrease as well this on the other hand means that the error voltage will increase and thus the time the error voltage is higher than the triangle voltage becomes longer as well which ultimately means that the duty cycle increases and thus the initially targeted output voltage would get sustained pretty smart I would say and with this design guideline in mind I created an appropriate schematic mainly consisting of two rail-to-rail op amps and a TC of 44:20 MOSFET driver which together form a triangle generator a differential op amp configuration and a comparator which controls the MOSFET driver and thus the MOSFETs and once the schematic was complete I began connecting all the components to one another according to the schematic on a breadboard which due to the rather big number of necessary components took quite a while but as soon as I was done creating the circuits I powered up and adjusted D create a triangle tidge with the two potentiometers so that it stretches perfectly between the zero volts and 2.5 volts a voltage level that adjustment then basically made the boost converter ready to use which as you can see it did work somehow but due to the unpredictable nature of breadboard circuits it was not a usable boost converter yet so to make sure that the circuit really does work without a problem I assembled it once again on a piece of proof port which did get rid of loose connection problems and unwanted parasitic capacitances and after two hours of soldering the circuit was complete and after the power up and once again adjusting the triangle voltage it was time for proper testing session as you can see adjusting the output voltage is possible with the output trimmer and by increasing / decreasing the input voltage the duty cycle of the MOSFETs cut decreased / increased which means the output voltage stayed almost constant and as expected by changing the output loads the voltage can also decently sustain its constant level but please do not think that this circuit is flawless there were in fact a couple of weird problems which means that in case you want to build your own boost converter I would still recommend the microcontroller version or a version of pulled around a simple switch IC so the conclusion of the initial question is yes of course you can create a boost converter without the microcontroller but look at how much more components were required and extending the functionality of such a circuits will always be easier to accomplish with a microcontroller but anyway I hope you enjoyed watching this video if so don't forget to like show and subscribe stay creative and I will see you next time