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Hi,
Buffers usually provide protection to the microprocessor from what is called, `back EMF`(also called spiking) in layman's terms, or the energy created in the coil as the control voltage is released. Also, since most micro's have limited output current capabilities, the buffer could serve as a relay driver, providing the power necessary to energise the relay.
Hope this helps,
Cubby
Cubby is right, mostly the maximum current that a micro controller can source or sink is 25ma, where as most of the relays require 50ma-200ma so a buffer is required to provide the necessary current to activate the relay coil, moreover a back emf is generated when the relay is turned OFF which can damage the controller so buffer also protects the controller from this back EMF......check this link to know more about interfacing relay to a micro controller
http://www.dnatechindia.com/index.php/Tutorials/8051-Tutorial/Relay-Interfacing.html
What else can I help you with?
Why do you use buffer between micro controller and gate driver circuit?
thu ni yankamma
What is buffer in microprocessor?
By using buffer along with micro-controller, it is possible to reduce the effect of 'back EMF' or 'Spiking Effect'. The capacity of any micro-controller is to sink or source current up to 25mA and its ports gets damaged if it is more. So buffer protects ports of micro-controller getting damaged. And it is possible to get appropriate data trans-receiving by using buffer in micro-controller.Sachin Joshi
Difference between avr micro controller and 8051 micro controller?
constructed on a single chip is called micro processor constructed on a single board is called micro controller
What is the main difference between micro controller and fpga?
micro controller is software and fpga is hardware
Give difference between micro controller and micro processor in terms of architecture?
no answer
What is fullform SBUF?
if you are talking about micro controller, it is "serial buffer". it is used to store the the data if RAM is full! just like queue.
Who introduced the micro controller?
Dr. Glassenhigmer invented the micro controller
How do you drive a motor requiring 2.6 ampere current using a micro controller whose output is 5 V and current in milliamperes?
A PLC uses intermediary relays between the PLC and the load. The relays have the proper load requirements that the PLC's output can handle. PLC drives the relay, relay drives the motor.
Is a micro-controller hardware?
Yes, a micro-controller is hardware. It is the hardware that the firmware and/or software.
How micro controller differs from micro processor?
micro controller contain system on chip memory, timers,counters where as a micro processor doesn't contain all these
What is diff between arm processor and micro controller?
arm is a latest version of microcontroller
What type of micro controller is AT89S52?
Its an I\O controller
