Управление IGBT и MOSFET транзисторами при помощи оптодрайвера. Борьба со сквозным током.

My research into power transistor control was a bit surprising. I've been seeing circuits with amplified IR2110 transistors quite frequently. Moreover, the microcircuit amplification is provided by BD135-BD136 transistors. While these transistors certainly have a fairly decent unity gain frequency, amplifying a microcircuit capable of delivering 2 amps at its output with transistors with a maximum collector current of 1.5 amps seems a bit excessive. Of course, the microcircuit can be amplified, but it's best to consult reference materials first. Personally, the KT972-KT973 immediately came to mind, but that's just off the top of my head. However, the IR2110 is by no means the only microcircuit capable of driving power transistors. There's a whole range of microcircuits designed specifically for this purpose, with different purposes and parameters. This video discusses the use of optodrivers. An optodriver is convenient primarily because its control current is relatively low—no more than 5 mA. Its drawback, however, is the need for an additional power source for the high-side driver. Several solutions are used to address this issue. The most popular way to power the high-side driver is to add additional windings to the standby transformer and supply power from there. The second method I've seen involves generating power for the drivers from the low-voltage supply. Pulses from the master oscillator (even a PWM controller) are fed to the same optodriver, and a transformer is connected to its output via a coupling capacitor. The high-side optodrivers are powered from the secondary windings of this transformer. This video demonstrates the functionality of the third method—creating a voltage boost, similar to the principle used in the IR2110, where energy for the power transistor is drawn from the boost capacitor. Naturally, the need for capacitors larger than 10 μF in this circuit was verified. In addition, the optodriver itself was tested for the presence of a Schmitt trigger, the possibility of parallel connection, and the control signal propagation delay time. The current developed by the driver to control the power transistor was measured. Since truly "heavy" transistors were used, and the control oscillator intentionally had no deadtime, several methods for combating shoot-through current were tested. The results of this lab can be used in independent design of high-power inverters, including welding inverters, and in the design of high-power Class D amplifiers. 2:05 - Checking the presence of a Schmitt trigger; 5:33 - Checking the possibility of parallel connection; 13:18 - Combating "ringing" by changing gate resistors; 15:05 - Accelerating the turn-off of power transistors; 17:21 - Combating "ringing" by installing a snaber parody; 19:13 - Making the driver work harder; 21:34 - Checking the optodriver's delay time; 24:37 - Measuring the gate current; 27:02 - Checking the boost voltage; 35:52 - Combating shoot-through current using ferrite beads; 39:56 - Conclusions; 41:20 - Final circuit diagram of the test device The effect of the setup on the drain, source, and gate is here:    • Различные комбинации установки ферритовых ...