I have a boost converter that with load 22K, it produces 120V with input 12V. the inductor is 220uH and the capacitor is 150uF. i need it for ultrasonic pulser with frequency of 1-10 MHz, the load of the pulser is 2.2 Kohm. i use arduino as switching controller of the mosfet in boost converter. the arduino will get the output voltage and adjust PWM (31 KHz) with PI system to calculate duty cycle. the problem is, when the output voltage is not attached to the pulser load, it gives exact 120V, but attached, it drops down to 70V, to maintain the output 120V, the input need to be increased to 24V, but i want it to be 12V, what i have done are
- make the KP and KI of PI higher, not work
- increase the inductor value, not work
how can i maintain the output? as far as i know, that the gain need to be higher, but how?
the second question is, how to calculate the value of capacitor and inductor? for the capacitor rating, is it necessary to match the capacitor rating with output voltage or the input voltage?
could i use a cascade boost converter? for an example using XL6009 to boost my 12V to 28V and then feed it to the boost converter?
this is my schematic