VWO35-12HO7

Current - On State (It (RMS)) (Max):	35A
Base Part Number:	VWO
Package / Case:	Module
Mounting Type:	Chassis Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Current - Hold (Ih) (Max):	50mA
Current - Non Rep. Surge 50, 60Hz (Itsm):	200A, 210A
Current - Gate Trigger (Igt) (Max):	65mA
Voltage - Gate Trigger (Vgt) (Max):	1.5V
Series:	--
Current - On State (It (AV)) (Max):	16A
Voltage - Off State:	1.2kV
Number of SCRs, Diodes:	6 SCRs
Structure:	3-Phase Controller - All SCRs
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction

The VWO35-12HO7 is a Thyristor Module with phase angle control made by IXYS. It is capable of high voltages and power with easy controllability over a wide range of possible loads. This module is used in applications such as controlling power distribution, protecting circuits from overload, providing low harmonic distortion in inverters and drives, and providing protection against overvoltage or short-circuits in power supplies.

SCR Theory

A silicon-controlled rectifier (SCR) is a four-layer solid state switch, which is a member of the Thyristor family of semiconductor devices that are responsible for the commutation of power and control of current. It is made of a silicon body consisting of a control element and a pair of junction chokes. When a voltage is applied to the SCR between its anode and gate, it will act like a diode, allowing current to flow in the forward direction. Upon the application of a second voltage to the gate of the SCR, the SCR can be turned on and the current can be controlled in the forward direction. The SCR can be used in various switch mode converters and other motor control applications.

Module Operation

The VWO35-12HO7 module consists of a three phase silicon-controlled rectifier (SCR) bridge which is designed for highly efficiency AC circuits for the load control. It has three phase control which helps to reduce the cost and complexity involved in a pure phase control circuit. The module has the capability of both cyclic and phase angle firing. It employs a built-in logic module with adjustable over pressure protection. The firing circuit of the module works with a zero-crossing detector and phase-shift trigger transformer. The firing angle is programmable and the frequency is selectable. The operating temperature ranges from -55 degree Celsius to 125 degree Celsius and the device has thermal protection to prevent any damage caused by the heat generated.

Applications

The VWO35-12HO7 module has many applications in areas such as cell phone chargers, variable speed motor drives, air conditioning systems, heating and air-handling units, and adjustable speed motor control. It can be used in power supplies for controlling power, voltage and current as well as for protection from overload and short-circuit. It can also be used in high efficiency inverters, AC servo motor drives, and AC arc welding machines. In addition it can be used for light dimming, adjustable speed drives, and reversing access control.

Conclusion

The VWO35-12HO7 module is a Thyristor Module which is used for various forms of control over a various loads and devices. With adjustable over pressure protection and temperature protection, it is safe and reliable. It is used mostly in motor control applications and AC circuits. Applications include air conditioning systems, variable speed motor drives, power distribution, protect circuits from overload and short-circuits, and light dimming on adjustable speed drives. All in all, this module is a very valuable and useful tool in the area of power and control.

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