EL817(A)-VG

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EL817(A)-VG Optoisolators - Transistor, Photovoltaic Output Application Field and Working Principle

The EL817(A)-VG optoisolator is a type of transistor-photovoltaic output optoisolator, designed to provide electrical isolation between two circuits. The device operates in many applications, from low-level digital logic (such as a simple transistor switch) to high-power switching applications in industrial machinery. This article will aim to explore the application field and working principle of the EL817(A)-VG optoisolator.

Application Field:

The most common application of the EL817(A)-VG optoisolator is in protecting lower-voltage circuits from over-voltage and false triggering events present in higher-voltage circuits. This type of optoisolator allows for an isolated, low-voltage signal to be efficiently transmitted to the higher-voltage circuit and back again without damage to the connected electronics. As such, it is widely employed in a variety of consumer and industrial applications.

In consumer applications, the EL817(A)-VG optoisolator can be found protecting circuits in appliances, such as refrigerators and washing machines, as well as in computer hardware. It is also used in telecommunications equipment, where it is used to couple signals between different components in the network. In industrial settings, the device can be found in temperature controllers, relays, safety systems, and a variety of other control circuits.

Working Principle:

The EL817(A)-VG optoisolator is composed of two basic parts, the phototransistor and the photodiode. An LED (light emitting diode) is located inside the optoisolator, emitting light when current flows through it; this light is then detected by a photodiode, which converts the light into a usable electric signal. The photodiode is connected to a transistor, which is used to control the flow of current in the circuit depending on the signal generated by the photodiode. When the phototransistor receives a logic high level from the photodiode, it will turn on, allowing current to flow from the higher-voltage application to the lower-voltage one.

The EL817(A)-VG optoisolator provides excellent electrical insulation between the two circuits, effectively preventing any damage due to false triggering or overvoltage. The result is a secure connection between the two circuits, which can be used to transmit signals and control electrical power flows.

Conclusion:

The EL817(A)-VG optoisolator is a type of transistor-photovoltaic output optoisolator that is used in a variety of consumer and industrial applications to provide electrical isolation between two circuits. The device operates on a simple principle, using an LED, a photodiode and a phototransistor to control the flow of current from the higher-voltage side of the circuit to the lower-voltage one. This device provides an effective way to allow for secure control of electrical power between two circuits, without the risk of damage due to false triggers or overvoltage.

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