3. WHAT ARE MICRO CONTROLLERS?
• A microcontroller is a small computer on a single
integrated circuit containing a processor core, memory,
and programmable input/output peripherals.
• Microcontrollers are designed for embedded
applications, in contrast to the microprocessors used in
personal computers or other general purpose
applications.
• A microcontroller is often small and low cost. The
components are chosen to minimize size and to be as
inexpensive as possible.
5. WHY MICRO CONTROLLERS ARE
PREFERRED IN WASHING MACHINE?
• Adds a digital user interface with push buttons
rather than knobs
• Control and sensing go hand in hand, so
tracking of speed of motors , water
temperature, electrical failures, etc. is possible
easily
• Have easier control over machine operation
(timing profiles, intensity, motor speed, etc)
7. WORKING (IN SIMPLE TERMS):
--Chip has number of input and output pins
--The chip monitors the states of the
washing machine according to the input
selected by user
--Chip also has some analogue inputs and
outputs . Analogue input for comparing the
temp. and for perferming certain operations
at defiined temp.and analogue outputs to
vary the motor speed or water flow rate.
8. ACTUAL WORKING:
• Used for controlling both the IGBTs for
motor drive and the system.
• Need the capability to efficiently control
the torque and the amount of water
suitable for the amount of laundry.
• Generally microcontrollers with Vector
Engines are used for controlling multiple
motors efficiently and smoothly.
9. • The Vector Engine is a dedicated hardware that
automatically performs basic processing of the
Vector control and executes the PI controller to
control electric current.
• Circuits of the Vector Engine consist of the
following sections:
-Arithmetic unit to execute processing (called a
task for Vector Engine).
-Scheduler to control the operation of tasks.
-Interface between an AD converter and PWM
output.
10. • An interrupt signal from an AD converter activates the
Vector Engine. The Vector Engine acquires data and
executes computing such as coordinate transformation
and aspect conversion. Complex computation using
complicated software is no longer required, because
the Vector Engine automatically performs the PI
control for controlling speed, aspect conversion using
space vector and puts data into the PWM output circuit
11. Advantages:
• It works more efficiently then the earlier knobs
• It helps to maintain the water levels and also
helps to perform specific operations at specific
time
