IRKH91/08A

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IRKH91/08A Application Field and Working Principle

IRKH91/08A is a thyristor module product developed by ABB, a leading power and automation technology company. It is designed for use as a switch-mode power supply (SMPS) and as a voltage regulator, providing up to 35A of peak current and 200V of maximum reverse-blocking capability. The module has a rugged construction and can safely operate in high-temperature and high-humidity environments, making it suitable for a wide range of industrial applications.

IRKH91/08A Thyristors belong to the SCR (Silicon Controlled Rectifier) family of thyristors. These are two-terminal semiconductor devices that rely on the flow of current in one direction through the device when they are triggered by a gate voltage. The device enters a low-current or non-conductive level of switching when the gate voltage is removed. SCRs can remain "on" indefinitely until the gate drive changes, making them useful for devices that need to stay on for long periods of time.

IRKH91/08A thyristor modules incorporate a built-in SCR and a protection device such as a crowbar protection circuit. The built-in protection circuit allows the device to survive short-term overvoltage conditions. The module also has fast switching speeds and a high peak current capability. The module is capable of operating at temperatures up to 85°C and in humid environments, making it suitable for use in industrial applications.

Each IRKH91/08A module has four base terminals: Anode, Gate, Cathode, and VCC. The anode acts as the input terminal for a current pulse and the gate terminal provides the gate voltage for triggering the thyristor. The cathode terminal is the output terminal for the current pulse and the VCC terminal provides a voltage for the protection circuitry. To turn the device "on," the positive voltage is applied to the Gate terminal, triggering the thyristor. Once turned on, the current flows from the Anode to the Cathode, and the device will remain "on" until either the Gate voltage is removed or the current exceeds the overload protection.

In summary, the IRKH91/08A is a versatile thyristor module that offers high Current and voltage handling capabilities, fast switching speeds, and reliable protection circuitry, making it suitable for many industrial applications. Its rugged construction and ability to operate in high-temperature and high-humidity environments allows the module to be used in a wide range of industrial applications with ease.

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