've been stuck on an electronic problem for weeks. I would really appreciate if you could help me out. I need some mechanism to kill the kickback voltage of a coil that I drive with transistors. I plan to use two power supplies, one is low voltage, 12V and used most of the time during the cycle, and another high voltage 30V, which only comes into play when the kickback voltage exceeds +/-12V. I'm wonder if it's common in electronics to use IGBT or power MOSFET to switch the power supply. I've read that it's used in logic switch and in switch-mode power supply itself. However, I don't know if it's common to use it, or if it's proper to use in my case. I attached a picture of the circuit. The picture might be a bit confusing. The control pin is the gate, and the in and out pins are just drain and source. I just want that only one power supply is used at a time.
PIC2 is another circuit I thought of and I found it nicer to use, or at least it's more straightforward to me. But then I realized that it doesn't work becuase when the 30V is turned on, it will be shortened by the protector diode of 15V. Control block is just some circuit to decide whether the voltage exceeds a certain limit decide which transistor pairs to switch on. I can't think of any ways to modify it to make it work.
Any advice would be very much appreciated. It will be a great help to me. Thanks a lot.
PIC2 is another circuit I thought of and I found it nicer to use, or at least it's more straightforward to me. But then I realized that it doesn't work becuase when the 30V is turned on, it will be shortened by the protector diode of 15V. Control block is just some circuit to decide whether the voltage exceeds a certain limit decide which transistor pairs to switch on. I can't think of any ways to modify it to make it work.
Any advice would be very much appreciated. It will be a great help to me. Thanks a lot.
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