EL3H7(C)(TA)-VG Isolators

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Optoisolators are devices designed to electrically isolate input from output by using optical means. They are beneficial in applications where voltage, high frequency operation and/or high power must be isolated from one another. In this article, we will be discussing the application field and working principle of the EL3H7(C)(TA)-VG optoisolator (hereafter referred to simply as “the EL3H7”).

The EL3H7 is a very popular optoisolator, used in numerous applications. It is particularly useful when isolation between the input and output is necessary. Specifically, this model is designed to isolate digital signals at high voltages, typically up to 6.0kV. It also provides a very high switching or propagation speed, making it suitable for high-frequency applications. The EL3H7 features a transistor output, with a photovoltaic input. It also has a high current transfer ratio of 700%.

The transistor output of the EL3H7 allows it to be used in a wide variety of applications. For example, it can be used for isolating digital signals, such as those between processors and interfaces, or for controlling isolated circuits. In addition, it can be used to control relays and protect against voltage surges in circuits with high voltage AC power sources. In high voltage DC systems, the EL3H7 can also be used to isolate a portion of the system from the main control circuit by providing galvanic isolation.

Besides its general application field, the EL3H7 is also suitable for particular applications, such as automotive electronics. It can be used to isolate the 12 volt main power line from higher voltage systems or to provide protection against voltage transients in the main power line. The EL3H7 is also well-suited for security systems, providing isolation for sensors, relays, and other components, as well as providing light barriers and intruder detection.

To understand the way in which the EL3H7 works, it is first necessary to understand the basics of how optoisolators work. Essentially, an optoisolator is an electronic device that contains two electrical components separated by a light-transmissive material. The most common type of optoisolator is the transistor-photovoltaic output, as used in the EL3H7. This type of optoisolator works by converting a current from the input side into light, which then travels through the barrier material and is then converted back into a current on the output side.

In terms of the specific operation of the EL3H7, it can be broken down into four stages. The first stage is the input stage, which consists of the photovoltaic (PV) cell. The PV cell is designed to convert an incoming electrical current into light. The second stage is the light transmission, which occurs when the light generated by the PV cell travels through the barrier material. The third stage is the rectification stage, which takes place when the light is converted back into an electrical current by the output transistors. Finally, the output stage is where the current is converted into an output voltage.

In conclusion, the EL3H7 is an optoisolator designed to provide isolation for digital signals at very high voltages. It is ideal for applications where isolation between the input and output is necessary, particularly in high voltage systems. It is also suitable for particular applications, such as automotive electronics, security systems, and industrial automation. The EL3H7 works by converting a current from the input side into light, which then travels through the barrier material and is then converted back into a current on the output side by rectification, in four stages: input, light transmission, rectification, and output.

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