IR2110 getting demaged in full bridge inverter with MOSFET and Arduino

IR2110 getting demaged in full bridge inverter with MOSFET and Arduino


Hi everyone!

I've been in the forum for a while, reading and analysing the posts much more than posting, trying to find threads were the solved problems are similar to mine... In many situations I've found answers to my questions, but this time it didn't happened, so I'm opening this thread to ask for help.

I'm building a full H bridge inverter controled by an Arduino board. The circuit diagram follows.



Well, each half H bridge works fine, in a isolated manner. I mean, one half bridge works nice if the other is disabled, and vice-versa.

However, if I put both to work toghether, one of the IR2110 gets damaged (a least i think it gets) in the following manner: the LO pin (pin 1) will not low again. As LO it is always high, we fatally get a crossfire when HO turns high.

Taking a closer look in the IR2110 outside the breadborad, we have found that pins 3 and 1 (VCC and LO) are short circuited. It feels like the internal mosfet between VCC and LO is short circuited (please see the following IR2110 diagram, taken from the datasheet).



My doubts:
- Are the diodes fast enough (1N4007)?
- Since we are testing the topology, the contro signal is a square wave (properly built to avoid crossfire), but also very slow: Ton of 100 ms and Toff of 10 ms. So, the bootstrap capacitors are big, like 2200 µF. Could it be a problem (I don't think so, but...)?

Well, all suggestions are welcome, we already have 4 useless IR2110... :smile:

Please note that Q5 to Q8 are working simply as inverters (6N137 has inverted output logic).

Thanks in advance!

Regards,
V.

**broken link removed**
**broken link removed**

What are voltage values (U2, U3 and so on)?

iop95 , thanks for the help. The voltages you asked:

VCC = 5 V
Q1D (DC bus) = 12 V (but we are going to increase in the future...)
IR2110 VDD = 5 V
IR2110 VCC = 12 V

IR2110 VCC and DC bus are from same power supply or separate? If separate may be a problem; high-side internal FET from LO output may be reverse biased that demage this FET.

iop95, tks again.

Well, VCC and VDD for IR2110 come from the same power source, but it is a gray box to me since I'm not its designer. Just in case, I'll take the 12 V point (VDD) and use a 7805 regulator to feed the VCC pin. Then I can assure they came from the same source and have the same GND.

[Just after this post, we tried using a diode in each HO/LO pin, preventing reverse currents in such pins, and the IR2110s are alive till now. However, if someone has another solution, fell free to share].

vilela said:

iop95, tks again.

Well, VCC and VDD for IR2110 come from the same power source, but it is a gray box to me since I'm not its designer. Just in case, I'll take the 12 V point (VDD) and use a 7805 regulator to feed the VCC pin. Then I can assure they came from the same source and have the same GND.

[Just after this post, we tried using a diode in each HO/LO pin, preventing reverse currents in such pins, and the IR2110s are alive till now. However, if someone has another solution, fell free to share].

Click to expand...

i am facing the same problem, have destroyed at least 8.
in which direction are you connecting those diodes ?

Aamir_Sheikh said:

i am facing the same problem, have destroyed at least 8.
in which direction are you connecting those diodes ?

Click to expand...

Hi, Aamir,

Well, we moved on to a more modular solution, and now we are using the A3150 (https://www.farnell.com/datasheets/2848.pdf). Since it is already optocoupled, we have decreased the number of components, and the circuit is more "clean". Also, they are more robust (just one burned until now). However, we need four of them to make a full bridge.

Aamir, we are using A3150. It is already optocoupled and harder to destroy.

https://www.farnell.com/datasheets/2848.pdf

vilela said:

Aamir, we are using A3150. It is already optocoupled and harder to destroy.

https://www.farnell.com/datasheets/2848.pdf

Click to expand...

i dont htink i will be able to get these here

can you please tell me how did you connect the diode, you have already used one in parrallel with the gate resistor in your original schematic, and at what frequency were you switching those mosfets.

Aamir_Sheikh, the diodes were placed directly between 2101 outputs (pins 7 and 5) and the resistors R3 and R4. I did test if it woult prevent the 2101 from burning, however, I don't think it is a good idea to use premanently, since the 2101 output pins need to work as current sink at some moments. The frequency was 30 kHz.

Yes, 1N4007 is far too slow, you need a 200V+ diode at 35nS or faster

The chip you are using d good up to about 35kHz, it can get too hot above 50kHz

Regards

Orson Cart

pwrtnx.c o m