Inverter optocoupler device type - Delta

Create Date: 2024-8-30 12:03:23|Source: Delta/Delta

1. One is a triode type photocoupler, such as PC816, PC817, 4N35, etc., which is commonly used in the output voltage sampling and error voltage amplification circuit of the switching power supply circuit, and is also used in the digital signal input loop of the inverter control terminal. The structure is the simplest, the input side is composed of a light-emitting diode, and the output side is composed of a phototransistor, which is mainly used for blocking and transmitting the switching signal;

                               Inverter optocoupler device type - Delta

2. The second is an integrated circuit type photocoupler, such as 6N137, HCPL2601, etc., the input side light-emitting tube adopts a new type of light-emitting data with low delay effect, and the output side is composed of gate circuit and Schokett transistor, which greatly improves the working performance. Its frequency response speed is much better than that of transistor photocoupler, and it is also used in the fault detection circuit and switching power supply circuit of the inverter;

3. The third type is a linear photocoupler, such as A7840. The structure and performance are very different from the first two optocouplers. In the circuit, it is mainly used for the linear transmission of mV-level weak analog signals, and in the inverter circuit, it is often used for sampling and amplification of output current, sampling and amplification of DC voltage of the main loop.

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