Half bridge motor controller

Current seems normal to me for given schematic.

Anna schrieb:

I noticed that the voltage and current appear abnormal

Looks ok.

The first high doesn't come through because the boost capacitor had no time to charge.

The voltage decreases slowly because your pwm is too fast for the MOSFETs.

The current stays at 0 because if you either turn on the lower OR turn on the high side MOSFET there is never a closed circuit.

Probably the motor coil should go to GND and the half bridge may act as an synchronous rectifier.

When using the IR2110 it makes no sense to simultaneously drive HIN and LIN. Those signals should be complementary with an additional deadtime so that never both MOSFets are conducting at the same time.

Scheint doch mit beiden gebrückt zu gehen, war also Unfug was ich geschrieben hab. https://www.youtube.com/watch?v=i5jtj3erFRA

Thank you Thomas for your support! However, I think it's not normal that the current in the coil is zero. Also, the voltage in the MOSFET gates, both high side and low side, also seems abnormal.

Ok Thanks Thomas!

Hi Michael,

Thank you so much for your support. I connected the motor coil to GND as you mentioned, and the simulation has improved :) However, I think the current is still too low to drive a 60V 10A motor. Also, the voltage at the gate of the low side MOSFET is 12V, which I think should be higher. You can find the new simulation attached for further clarification.

Thank you again for your time and support!

Ok Thank you so much for your support Matthias!

Anna schrieb:

I think the current is still too low to drive a 60V 10A motor.

You have no freewheeling (ideally supported by synchronous rectifying).

Also, the voltage at the gate of the low side MOSFET is 12V, which I think should be higher

Never.

Here is also something about the chip: Beitrag "Infineon PSpice Lib in LtSpice einbinden"

Hi everyone, I tried to simulate the circuit, but the output voltage and current waveforms in the coil do not appear ideal. I added a freewheeling diode parallel to the load and some resistors on the gates to discharge the gate capacitance, but it seems insufficient. I am a student and would greatly appreciate your explanations and support regarding this issue. If you have any solutions or recommendations, please feel free to share them with me. Thank you so much! Attached are the circuit and simulation.

Anna schrieb:

I tried to simulate the circuit

You didn't understand anything.

The IR2110 can not operate (close) the high side MOSFET at the same time as the low side MOSFET as it requires the low side MOSFET to charge the boost capacitor in the off time of the high side MOSFET by connecting VS to GND.

You can only operate one MOSFET to PWM the motor voltage and may use the other for active frewheeling.

It is 100% sufficient to switch just one power connection of the motor, there is no need to break both.

Ok, thank you, Michael, for your support!

Michael B. wrote:

The IR2110 can not operate (close) the high side MOSFET at the same time as the low side MOSFET as it requires the low side MOSFET to charge the boost capacitor in the off time of the high side MOSFET by connecting VS to GND.

I tried to direct the focus of the TO to this already on 20th of June but it was ignored. The circuit will never operate properly with LIN and HIN driven by the same signal.