BRT11-H

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An optoisolator is one of the most commonly used types of isolators in electrical circuits. It uses optical channels to separate two or more parts of a circuit while allowing them to communicate. This type of isolation ensures that signals do not interfere with each other, as well as providing improved electrical safety. Specifically, a Triac or SCR optoisolator (i.e. BRT11-H) is designed to control the output current of an AC load. Common applications include controlled AC motor controls, switchings AC lamps, heater control and energy saving systems.

The BRT11-H optoisolator consists of three pins, two of which form the input and one the output. The input has a photocoupler which uses a light-emitting component and a light-receiving component. The light-emitting component is a light-emitting diode that emits an infrared light when it is supplied with a voltage. This infrared light is then received by the light-receiving component which is made up of a voltage divider circuit used to drive the output transistor. The output pin, which is typically used to control the Triac or SCR, is a closed loop circuit that remains either open or closed until it is triggered by the light-emitting component.

The working principle of the BRT11-H optoisolator can be explained with the help of the diagram below. When a voltage is applied to the light-emitting component, the infrared light is emitted from the LED side of the photocoupler. This light is then received by the light-receiving component which is made up of a voltage divider circuit used to drive the output transistor. The output transistor is then open or closed depending on the voltage divider circuit. The output signal is then used to control the Triac or SCR and therefore the output current of the AC load.

Figure 1: BRT11-H optoisolator working principle

In conclusion, the BRT11-H optoisolator is an isolation device that is designed to control the output current of an AC load. It consists of three pins, two of which form the input and one the output, and it utilizes a photocoupler to separate the two parts of the circuit. The working principle of the BRT11-H optoisolator can be explained with the help of the diagram above. The voltage is applied to the light-emitting component, which then emits infrared light that is received by the light-receiving component. This light is then used to drive the output transistor, which is then used to control the Triac or SCR and therefore the output current of the AC load.

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