LAA110STR Relays

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Solid state relays are becoming increasingly popular in modern industry, due to their electrical, mechanical and environmental characteristics. This article will discuss the application field and working principle of the LAA110STR solid state relay.

The LAA110STR is a solid state relay manufactured by Shinko Electric Industries. It is designed for use in a variety of industrial applications, including lighting, security systems, office automation, and process control. The LAA110STR can be used in environments where humidity, shock, vibration, or corrosive chemicals are present. It is also compatible with a wide range of power supplies, from 15VAC to 480VAC.

The LAA110STR solid state relay has three basic components: an MOSFET triode, an opto-electronic device, and a control circuit. The opto-electronic device, typically a light-emitting diode, light receptor diode, and an infrared LED, is connected to the control circuit and is used to control the conduction of the MOSFET triode. The control circuit consists of a comparator, driver circuit, and logic circuit. The entire circuit is powered by an external power supply, typically up to 12VDC.

The opto-electronic device is used to detect changes in a single external control signal. When this signal changes, the opto-electronic device emits or receives light, which is then detected by the control circuit. The comparator is used to compare the detected light intensity with a set reference level. If the detected intensity is below the reference level, the comparator will output a logic ‘low’. If the detected intensity is above the reference level, the comparator will output a logic ‘high’.

The driver circuit is then used to convert the logic level signal from the comparator into a signal level that can be used to control the MOSFET triode. When the logic signal from the comparator is ‘low’, the driver circuit will keep the MOSFET triode in the ‘off’ state, and vice-versa. The logic circuit is then used to ensure that the MOSFET triode does not stay too long in an ‘on’ or ‘off’ state.

In summary, the LAA110STR solid state relay is a compact, reliable and cost-effective device for use in a wide variety of industrial applications. Its three-component circuit, consisting of an MOSFET triode, an opto-electronic device, and a control circuit, enables it to detect changes in a single external control signal and control the MOSFET accordingly. This makes the LAA110STR an ideal device for controlling DC loads with AC power supplies.

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