I just finished designing my rectifier module that has a built-in voltage monitor IC and an eFuse IC.
Its purpose is to convert the 3-phase AC output from my wind turbine and use it to power my USB type-C charger.
My biggest hurdle with the type-C charger is that it only turns on with a hard start, and won't function from a soft start. Unfortunately, since the power is coming from my wind turbine, it's going to get nothing but soft starts.
So in order to get around this, I made this circuit to force a hard start, allowing the charger to work correctly, yet also allows a range of hysteresis (about ~1.4V) between turning on and turning off.
I chose to use a TPS3700 voltage detector to drive an SR latch, which controls an NPN transistor that switches the Enable pin (EN/UVLO) on and off for the TPS2595. The TPS3700 sets the SR latch when the rectified turbine voltage is greater than 5.2V, and then resets the SR latch when the voltage falls below 3.8V
If my TPS3700 is wired correctly(I think it is), the OUTA pin will go high when the input voltage is more than 5.2V (INA+ pin senses more than 400mV). And, the OUTB pin will go high when the input is less than 3.8V (INB- pin senses less than 400mV). I used a voltage divider to make sure the 400mV threshold voltage at INA+ and INB- pins are met at the correct time.
According to the datasheet for the TPS2595, the Enable pin (EN/UVLO) has a turn-on threshold of 1.2V and a maximum threshold of 7V. Because of this, I used a voltage divider to keep the voltage under 7V, yet high enough that it will remain over 1.2V throughout operation. I remember someone mentioned a Zener diode could be used to prevent the threshold from exceeding 7V, but I am unsure which method is better than the other.
Also, I designed my SR latch in reference to various schematics found on google, so I just chose the resistor values according to what I saw. Is there anything I'm overlooking as far as the SR latch layout goes?
Same thing goes for capacitor layout, I just want to know if there is anything I'm overlooking. I used three 220uF capacitors to smooth the rectifier voltage, and a 100nF capacitor in front of each IC to absorb noise (the datasheets said it's good to do this). Are there any other locations I should insert a capacitor?
Any help is greatly appreciated, as well as all of the help I've received in the past! Thank you!
Here is the circuit, I circled the SR latch and the transistor that it controls.:
TPS2595 Datasheet: https://www.ti.com/lit/ds/symlink/tps2595.pdf?ts=1678518905267
TPS3700 Datasheet: https://www.ti.com/lit/ds/symlink/tps3700.pdf?ts=1678532115159&ref_url=https%253A%252F%252Fwww.ti.com%252Fsitesearch%252Fen-us%252Fdocs%252Funiversalsearch.tsp%253FlangPref%253Den-US%2526searchTerm%253DTPS3700DDCR%2526nr%253D13