Arnan Sipitakiat Dept. Compute Engineering, Chiang Mai University

basketontarioElectronics - Devices

Nov 2, 2013 (3 years and 7 months ago)

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Arnan

Sipitakiat

Dept. Compute Engineering, Chiang Mai University

What’s wrong with this circuit?

A microcontroller usually supplies limited current (i.e. 25 mA).

This is ok for LEDs but not enough for high current loads like a motor

Transistors

Using transistors as a switch

Using a transistor

Relays

Relay “Poles” and “Throws”

Driving load with a relay

Solid
-
State Relays

H
-
Bridge: A bi
-
directional driver

Relay H
-
Bridge

Transistor H
-
Bridge

H
-
Bridge
IC / Module

Conclusions


There are many ways to drive output devices


Transistors are good for low power applications


Relays are suitable for AC power applications or when
low loss and high current is needed


H
-
bridge is for bi
-
directional applications


Choose the right tool for the job!