IRKH91/16A

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IRKH91/16A is a family of silicon controlled rectifier modules manufactured by IR, a division of Vishay Intertechnology. An IRKH91/16A module is a three-phase bridge designed for use in the power electronics field. The module utilizes either the IRKH91 or the IRKH16A silicon controlled rectifier (SCR).

The IRKH91/16A module provides a cost-effective power element for applications where consistent, heavy-duty switching capability, protection from short-circuiting, and protection from over-voltage and over-current conditions are necessary. The module is housed in a black epoxy package, which is sealed and stands up to extreme temperatures and is considered to be thermally and electrically protected. Typical applications include adjustable-speed AC drives and motor controls, UPSs, wind energy, photovoltaic energy, and other high-power industrial applications.

The module utilizes a combination of internal and external components to provide a complete switching solution. Internally, the module houses three SCRs. Each SCR is a gate-controlled, solid-state current switch which, when triggered, allows a predetermined amount of current to pass through. In addition to the SCRs, the module also utilizes an array of devices, such as fuses and resistors, to protect the device from overheating and over-current conditions. Externally, devices such as a gate resistor, gate capacitor, and an isolation transformer are used to regulate the voltage entering the SCRs and protect them from short-circuiting.

Power is applied to the module through the three main terminals. When current is supplied to the gate terminals, the SCRs are triggered, allowing current to flow through the main terminals. The main terminals can be switched on and off independently, allowing for independent speed and torque control of the motor. In addition to controlling the flow of current, the SCRs also provide thermal protection, helping to prevent the module from overheating.

The IRKH91/16A module provides an efficient and cost-effective solution for power electronics applications. Its robust design and reliable operation ensure that it will provide reliable operation in extreme conditions. The module has passed through a rigorous testing process, ensuring it will perform to the highest standards in its intended applications.

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