Hi everyone!
I need to control a Peltier module (TEC1-12709) in heating and cooling mode. Browsing similar topic i decided to control the Peltier with a LC filtered 50kHz PWM signal with an H bridge configuration. I simulated the prototype in LTSpice (the project is attached).
- The H bridge will be modified into a 4-NMOS configuration with proper gate driver, the one in the schematics is just for simulation purpose;
- Vdd is 12V;
- Frequency isn't a constraint, i've chosen "high" frequency PWM to reduce the inductors values;
With the LC filter the current is pretty smooth but the voltage at the non conducting PMOS source is acting strange, causing the MOS turning on in the opposite way (i suppose) and conducting something like 50A to the power source.
How should i modify this circuit (or rebuild it from scratch)?
Thanks for the help.
I need to control a Peltier module (TEC1-12709) in heating and cooling mode. Browsing similar topic i decided to control the Peltier with a LC filtered 50kHz PWM signal with an H bridge configuration. I simulated the prototype in LTSpice (the project is attached).
- The H bridge will be modified into a 4-NMOS configuration with proper gate driver, the one in the schematics is just for simulation purpose;
- Vdd is 12V;
- Frequency isn't a constraint, i've chosen "high" frequency PWM to reduce the inductors values;
With the LC filter the current is pretty smooth but the voltage at the non conducting PMOS source is acting strange, causing the MOS turning on in the opposite way (i suppose) and conducting something like 50A to the power source.
How should i modify this circuit (or rebuild it from scratch)?
Thanks for the help.
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