Yesterday, I recommend Simple working principle of the inverters. Which you have understood well. Today we see Operation of 200 watt inverter diagram continuously.
In the block diagram of Figure 1. Starting from the frequency generator circuit or the oscillators that works with IC2 numbers SG3526 Which is IC pulse width modulation as figure 2 shows the internal structure. Served to genered the rectangular signal on frequency 50Hz output to Output A and B.
Which both these output signals have phase difference of 180 degrees all the time. That is if a Status Output A High, Output B will be low. Or If Output A is Low, Output B will be the High instead. These two signals are sent to control the output transistors Q1 and Q2.
Both transistors Q1 and Q2 are Enhancement MOSFET type of N channel So not conduct current simultaneously. Cause the current that flow in the primary coil of transformer T1 flow switch a way all time. Electromagnetic fieldSo swelled and collapsed, inductor to the secondary set. get voltage 220 volts frequency of 50Hz to output.
After the circuit work will cause heat up the transistor. power output (Q1 and Q2) If the heat is too high. It may be dangerous to the transistor. Especially when it requires more power to the load. Therefore, So need to check the temperature of the cooling pad or heat sink for both transistors are overheating or not? This is a device that functions by PTC (Positive Temperature Control) If the temperature rises abnormally, the PTC will send the check to the IC1.
Which is op amp IC1 Reset command is sent to IC2. to IC2 frequency generator to stop. The end result is that the output transistors are both 2 stops prevent damage to the transistor.
This article is part of 200 watts home power inverter project using SG3526N You can read each section for continuity.
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