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In the inverter circuit, frequently used optical coupling device , there are three types :
An optocoupler is a triode type , such as PC816, PC817, 4N35 , commonly used in switching power supply circuit and the output voltage of the sampling error voltage amplifier, a control terminal of the inverter is applied to a digital signal input circuit . The most simple structure , the input side of a light-emitting diode , a phototransistor output side by the constitution , is mainly used for the isolation switch signal transmission ;
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2, the second type of IC optocouplers, such as 6N137, HCPL2601 , etc., on the input side of the arc tube with a delayed effect of the new low -emitting materials , the output side of the circuit and the Schottky gate transistors, so much work performance improved. Significantly improved the speed of its frequency response than the transistor optocoupler , the fault detection circuit of the inverter and switching power supply circuit is also applied ;
3 , the third is a linear optocoupler , such as A7840. Structure and properties of the optocoupler is very different from the first two . In the circuit is mainly used for mV level linear weak analog signal transmission , the inverter circuit, often used for sampling and amplifying the output current handling , sampling and main circuit DC voltage amplification process .