Problem in the control of the pump 12V :in the motor drier!!!

[Houssem85]

Problem in the control of the pump 12V :in the motor driver!!!

Hello all,

I designed this circuit and I will use this method to control my pump 12V (in the place of an other circuit which I posted two weeks ago...) from the STM32 microcontroller which give a PWM 3.3V in the input.

The problem now is : If I put the supply +12V, the IR2110 become very hot and it is destructed!!! the IRF350 is also very hot and I haven't the PWM (12V) in the output !!!!

Can you help me and tell me what's the problem and what can I modify ???

 

[chuckey]

According to : -www.irf.com%2Fproduct-info%2Fdatasheets%2Fdata%2Fir2110.pdf&ei=IasVU_30Cazo7AaVnoH4BA&usg=AFQjCNFeI11fg0fY10YpSGt3iJmB3Xabcg&bvm=bv.62286460,d.ZGU, you have wired it up incorrectly. Pin 3 should be Vcc and pin 2 = com.
Frank

 

[chuckey]

Just been thinking about your circuit. Can your driving source drive into a 56R with a LED in series with it (I ~50mA). Also the FET does not require much power only voltage, so I think the IR2110 is overkill. What sort of frequency is your PWM? If you preceed your FET gate with an emitter follower, then with its base returned to the 0V line via a 10K, and the photodiode strung between its base base and +Vcc with a 1K series (current limiting) resistor. Then depending on the current transfer ratio of the opto isolator, 20mA into LED = > 10mA output into base of emitter follower, the emitter follower will then be capable of outputing 10 mA X Hfe > 500mA? This will pull the gate positive quickly, but the discharge will be via the emitter resistor so this should be as low as possible consistent with getting the change of voltage on the FET gate ( 1k to start with?).
Frank

 

[Houssem85]

Hello,

I solved my problem. The pump must be connected in parallel with the free wheeling diode BYW29.