Solcar
New member
When I first began tinkering with SMPS design several years ago, it occurred to me that it is a lot of trouble for the DIY circuit builder to have to examine and select from the numerous SMPS controller IC chips.
I might have selected the 555 timer chip as a basis for a general universal design, but found it had some of the drawbacks that dedicated controller chips have.
I decided to go more basic and use the simple charging and discharging of capacitors as just about the totality of the frequency generation or PWM. The simplest way to do that is with the Schmitt trigger CMOS gate.
Here is a sample voltage doubling PWM circuit. It is like the one I presently use on an e-motor assist bicycle. I used LTspice to greatly help with the design.
I might have selected the 555 timer chip as a basis for a general universal design, but found it had some of the drawbacks that dedicated controller chips have.
I decided to go more basic and use the simple charging and discharging of capacitors as just about the totality of the frequency generation or PWM. The simplest way to do that is with the Schmitt trigger CMOS gate.
Here is a sample voltage doubling PWM circuit. It is like the one I presently use on an e-motor assist bicycle. I used LTspice to greatly help with the design.