IRKT71/12A

Current - On State (It (RMS)) (Max):	165A
Base Part Number:	KT71
Package / Case:	ADD-A-PAK (3 + 4)
Mounting Type:	Chassis Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Current - Hold (Ih) (Max):	200mA
Current - Non Rep. Surge 50, 60Hz (Itsm):	1665A, 1740A
Current - Gate Trigger (Igt) (Max):	150mA
Voltage - Gate Trigger (Vgt) (Max):	2.5V
Series:	--
Current - On State (It (AV)) (Max):	75A
Voltage - Off State:	1.2kV
Number of SCRs, Diodes:	1 SCR, 1 Diode
Structure:	Series Connection - SCR/Diode
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction

IRKT71/12A is a thyristor module, which is mainly used in the field of motor control and power control. It takes two / three-phase synchronous motor control system as an example to explain the principle and application field of this type of thyristor module.

Working Principle

IRKT71/12A module works by controlling the thyristor’s on-off status in a cycle to realize the start, stop and speed adjustment of the motor. With the application of the direct power control technology, the voltage and current of the AC motor can be changed to control the speed and torque of the motor. On the input side of the module, there is a trigger circuit which consists of two triac trigger tubes, two resistor and a capacitor. The triggering voltage decides the triac’s on-off status. Depending on the voltage level passing through, the triac triggers the thyristor. Upon the action of the trigger source, the thyristor will start conduction and the voltage transfer to the output stage of the module, so that the motor will start running and the speed of the motor is modified.Additionally, IRKT71/12A module is also equipped with an overload protection system. If a voltage overadmissible is applied, the thyristor’s conduction time extends, which triggers the overcurrent protection circuit, thus cutting off the triac and thus protecting the normal working state of the motor.

Applications

As IRKT71/12A is a high power thyristor module, it is widely used in various fields, such as industrial motor control, power adjustment and three phase AC controllers for micro-hydro power plants.In the industrial field, IRKT71/12A module can be used to implement two phase and three phase motor speed control, as well as single motor and motor group motor speed control. In the power adjustment field, it can be applied to adjust the frequency and voltage for a synchronous motor.In the micro-hydro power plant field, IRKT71/12A is used with a single-phase three wire asynchronous motor control system. With the motor driven by the system, the power output of the hydropower station can be improved and their corresponding economical benefits can be achieved.

Advantages

Compared with the traditional motor control system, the usage of IRKT71/12A module has several advantages. The static characteristics of the system are good, the running noise is small, the efficiency is high and the system start-up time is short.The structure of the system is relatively simple and easy to control. Furthermore, the trochoid regulating mechanism can achieve good speed control accuracy, which is conducive to the production process as a whole.

Conclusion

In conclusion, IRKT71/12A is a large power thyristor module with simple structure and high efficiency, which is widely used in the fields of industrial motor control, power adjustment and micro-hydropower plant. It has the advantages of good static characteristics, small running noise, high efficiency and short starting time, so it is a preferred choice for controlling power distribution and motors.

The specific data is subject to PDF, and the above content is for reference

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