I am trying to use a simple OPAMP multivibrator/oscillator that generates a square wave 17V signal to drive a MOSFET inverter.
I have run into a problem: the OPAMP can only drive one of the two MOSFETs at a time because attempting to drive both simultaneously results in the signal wires from the OPAMP being shorted across the positive rail of the power supply the MOSFETs are supposed to be inverting, this is because i need the MOSFETS do be driven with opposite waves, the easiest way to do this is by wiring the OPAMP output to the gate of one MOSFET and the ground to the drain, and then wire the ground to the gate of the other MOSFET and the OPAMP output to the drain. I tried using diodes to split the wave into it's positive and negative counterparts and drive one MOSFET with one half, and the other with the other half, but since the gate forms a capacitor and the other half of the signal isn't there to rapidly drain that capacitor, then the MOSFETs don't produce a nice square wave like i need them to to function efficiently. I tried adding resistors between the drain and gate, but that only worked at low frequencies. I tried using a little ferrite transformer to isolate the OPAMP, but it draws too much current for the OPAMP to handle.
Is there a way to drive the MOSFETs directly with one OPAMP multivibrator? If only MOSFETs and IGBTs were 4 terminal devices...
I have run into a problem: the OPAMP can only drive one of the two MOSFETs at a time because attempting to drive both simultaneously results in the signal wires from the OPAMP being shorted across the positive rail of the power supply the MOSFETs are supposed to be inverting, this is because i need the MOSFETS do be driven with opposite waves, the easiest way to do this is by wiring the OPAMP output to the gate of one MOSFET and the ground to the drain, and then wire the ground to the gate of the other MOSFET and the OPAMP output to the drain. I tried using diodes to split the wave into it's positive and negative counterparts and drive one MOSFET with one half, and the other with the other half, but since the gate forms a capacitor and the other half of the signal isn't there to rapidly drain that capacitor, then the MOSFETs don't produce a nice square wave like i need them to to function efficiently. I tried adding resistors between the drain and gate, but that only worked at low frequencies. I tried using a little ferrite transformer to isolate the OPAMP, but it draws too much current for the OPAMP to handle.
Is there a way to drive the MOSFETs directly with one OPAMP multivibrator? If only MOSFETs and IGBTs were 4 terminal devices...