Photocouplers (referred to as optocouplers) are commonly used devices in switching power supply circuits. There are two types of optocouplers: one is a nonlinear optocoupler and the other is a linear optocoupler.
Commonly used 4N series optocouplers are nonlinear optocouplers
A commonly used linear optocoupler is the PC817A-C series.
The current transfer characteristic of a nonlinear optocoupler is non-linear. This type of optocoupler is suitable for the transmission of switching signals and is not suitable for transmitting analog quantities.
The current transfer hand characteristic curve of the linear optocoupler is connected to a straight line, and the performance is good when the signal is small, and the isolation can be controlled by the linear characteristic.
The optocouplers commonly used in switching power supplies are linear optocouplers. If a nonlinear optocoupler is used, it is possible to deteriorate the oscillation waveform, and in severe cases, parasitic oscillation occurs, so that the oscillation frequency of several kilohertz is sequentially modulated by the low-frequency oscillation of several tens to hundreds of Hz. The result is that color TV, color display, VCD, DCD, etc. will cause interference on the image screen. At the same time, the power supply has a reduced load capacity.
In the maintenance of switching power supply such as color TV, display, etc., if the optocoupler is damaged, it must be replaced by a linear optocoupler.
The commonly used 4-pin linear optocoupler is PC817A----C.
Commonly used six-leg linear optocouplers such as PC111 TLP521 are: TLP632 TLP532 PC614 PC714 PS2031 and so on.
The commonly used 4N25 4N26 4N35 4N36 is not suitable for use in switching power supplies because these four optocouplers are nonlinear optocouplers.
After checking a large amount of information, the following are the high-speed diaphragm models commonly available on the market:
100K bit/S:
6N138, 6N139, PS8703
1M bit/S:
6N135, 6N136, CNW135, CNW136, PS8601, PS8602, PS8701, PS9613, PS9713, CNW4502, HCPL-2503, HCPL-4502, HCPL-2530 (two-way), HCPL-2531 (two-way)
10M bit/S:
6N137, PS9614, PS9714, PS9611, PS9715, HCPL-2601, HCPL-2611, HCPL-2630 (two-way), HCPL-2631 (two-way)
The gain of an optocoupler is referred to as the current transfer ratio (CTR) of the transistor output device and is defined as the ratio of the phototransistor collector current to the LED forward current (ICE/IF). The phototransistor collector current is related to VCE, the voltage between the collector and the emitter.
A thyristor type photocoupler also has an optocoupler which is a thyristor type photocoupler.
For example: moc3063, IL420;
Their main indicator is the load capacity;
For example: the load capacity of moc3063 is 100mA; the IL420 is 300mA;
Model Specifications Performance Description
4N25 transistor output
4N25MC transistor output
4N26 transistor output
4N27 transistor output
4N28 transistor output
4N29 Darlington output
4N30 Darlington output
4N31 Darlington output
4N32 Darlington output
4N33 Darlington output
4N33MC Darlington output
4N35 Darlington output
4N36 transistor output
4N37 transistor output
4N38 transistor output
4N39 thyristor output
6N135 High Speed ​​Optocoupler Transistor Output
6N136 High Speed ​​Optocoupler Transistor Output
6N137 High Speed ​​Optocoupler Transistor Output
6N138 Darlington output
6N139 Darlington output
MOC3020 thyristor drive output
MOC3021 thyristor drive output
MOC3023 thyristor drive output
MOC3030 thyristor drive output
MOC3040 zero-crossing trigger thyristor output
MOC3041 zero crossing trigger thyristor output
MOC3061 zero-crossing trigger thyristor output
MOC3081 zero-crossing trigger thyristor output
TLP521-1 single optocoupler
TLP521-2 dual optocoupler
TLP521-4 four optocoupler
TLP621 four optocoupler
TIL113 Darlington output
TIL117 TTL logic output
PC814 single optocoupler
PC817 single optocoupler
H11A2 transistor output
H11D1 high voltage transistor output
H11G2 resistance Darlington loses
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