Have you ever faced a voltage change or surge suddenly? 

It might be in countries where electricity isn't stable or in any natural disaster. Voltage change or surge will damage electrical devices and appliances. 

Moreover, it’s important to keep stable voltage for industries and machines including computer systems, refrigerators, air conditioning, flat screen television, audio/video equipment, PCB drilling machines, integrated processing machine, SMT electrical discharge machine, milling machine, AI plug-in machine, grinder, semiconductor equipment, laboratory medical monitoring equipment…. etc.  

The malfunction will further cause inconvenience, safety accidents, and cost loss. 

Under the circumstances, POWEREX suggests you use an automatic voltage regulator (AVR) to avoid this. Servo type and relay type automatic voltage regulators are among the most widely used automatic voltage regulators. 

Here are the introduction and guide on how to choose the suitable automatic voltage regulator between the servo type and relay type.

What is an Automatic Voltage Regulator (AVR)?

Before we talk about servo type and relay type, here is a brief introduction to the automatic voltage regulator. 

Automatic Voltage Regulator (AVR), also known as an Automatic Voltage Stabilizer (AVS) or Voltage Regulator (VR). 

It plays a crucial role in a power supply system.
AVR stabilizes the mains power supply voltage and raises/lowers the voltage from the source to the load. 

It can also stabilize the noise interference of the power supply, and remove voltage spikes.
The output voltage of the generator is attained from a voltage transformer. AVR rectified, filtered, 

and compared the voltage with a reference to check the error.

Why is Automatic Voltage Regulator So Important?

AVRs are able of ensuring that the output voltage delivered will match its load current when variations occur. 

This removes the damage that can cause to appliances, machines, and equipment. 
It is critical if there is any accident or profitable loss caused due to voltage spikes. People cannot forecast if this situation will happen or not. 

Hence POWEREX advises you considering to purchase an AVR to protect your appliance and equipment.

Servo Type AVR VS Relay Type AVR

What is Servo Type AVR?

Servo-motor type AVRs use a servo motor and a carbon brush to adapt the input voltage to output voltage mechanically. 

They are classified as single-phase or three-phase. 

The advantages of servo AVRs are better accuracy of output voltage, high dependability, high perfection of the stabilized affair, and suitability to repel flux currents.  

• Output voltage accuracy: ±1% error. (High precision)
• Can apply in industrial industries and homes.
• Servo motor is more expensive than relay. But servo type AVRs are more reliable and durable than relay type AVRs.

What is Relay Type AVR?

Relay type AVRs complete voltage regulations by switching the relays to connect the transformer to the load. 

Their correction speed is quicker than servo type AVRs. In addition, relay type AVRs are lighter and more affordable. They are extensively used for low-rating appliances.

• Quicker voltage correction speed
• Output voltage accuracy: 5-7 %.
• Cost and weight of relay is lower than servo motor.
• Protection is lower than servo type AVR

Conclusion

Above all, the way of AVRs controls the constant voltage decides which one you should select. When selecting AVR, an input voltage, the input voltage range and the ability to minimize voltage regulation should also be considered.

POWEREX’s automatic voltage regulators are highly efficient and easy to operate. We offer competitive prices, which makes us an outstanding and well-known voltage regulator supplier in Taiwan. Our products are the best choice for you. 

If you have further questions regarding choosing AVR, please do not hesitate to contact us!