Irf3205 switch circuit_irf3205 typical application circuit
irf3205 is a field effect tube widely used at present. This article brings you an introduction to three typical application circuits of irf3205.
A MOSFET drive circuit based on irf3205 design
The triangle in the figure below is an op amp. We can see that this op amp is now acting as a comparator. I will give him a constant level of 1V at the reverse end of the comparator (of course, 0.5V/1.5V will work. ), if MCU_IO (connected to the control port of the microcontroller) outputs a high level (the voltage must be higher than 1V), the output result of the comparator is close to VCC. It should be noted here, what is the output voltage of this comparator? At this time, the so-called high level output by the comparator is actually the power supply voltage VCC of the comparator. When you supply the comparator with the power supply voltage, you will output how much (slightly less than VCC). For example, here we are supplying power to the comparator. The voltage is 12V (this is also the best operating voltage of the MOSFET). At this time, the comparator outputs 12V. This 12V is added to the gate of the MOSFET, the MOSFET will be turned on, and the load will be energized. You can use any operational amplifier chip to build this comparator, such as LM358/LM324 and so on.
MOSFET drive circuit based on irf3205 design two
The driving circuit is a resistor R17 and a transistor Q4. When MCU_IO is high level 1, the transistor is turned on and the gate voltage of the MOSFET drops to low level. At this time, the MOSFET is turned off. When MCU_IO is low level, The transistor Q4 is turned off, and the MOSFET is turned on at this time.
High-power square wave inverter designed based on irf3205
This inverter is a high frequency inverter, completely abandoning the bulky power frequency transformer, not only reduces the volume, but also improves the efficiency, and there is no buzzing sound from the power frequency transformer. This inverter is a typical high frequency inverter power frequency output structure: DC-AC-DC-AC structure (12VDC-330VAC0 30KHz-330VDC-230VAC 50HZ). The inverter is equipped with voltage stabilization and output overcurrent protection functions.