You can find a lot of documentation on this kind of circuitry on the internet.
You have basically to compare your feedback signal to a triangular waveform with a comparator, to generate the PWM.
You can find a lot of documentation on this kind of circuitry on the internet.
You have basically to compare your feedback signal to a triangular waveform with a comparator, to generate the PWM.
However, something keeps on confusing me.
Here is my Orcad design of the circuit.
**broken link removed**
1. I do not have a voltage source in the primary side, how can I generate a duty cycle for the secondary circuit to work before the optocoupler sends back the error signal current to the primary side and adjust the duty ratio of the switch? A zero duty cycle at the beginning cannot generate any output voltage in the secondary side, how would any error be generated and do the feedback?
2. A current to voltage converter is applied for the current signal current to be converted to voltage and drive the switch. Is is correctly built?
Can anyone teach me how to construct the PWM controller in the first post without any MCUs?
The PWM controller should contain a lot of parts, but I have no idea in it...
The PWM controller should have the following functions,
1. Convert the feedback signal current into an error voltage
2. The error voltage drives the switch