Transcript How Coils Work

How Coils Work
A basic introduction into Coil technology.
Sumida’s Coil Technology
Sumida produces and distributes coils and transformer products,
based on skilful wire winding technology.
Our main customers are in the following industries:
 Consumer Electronics
 Entertainment Industry
 Automotive Electronics
 Industrial & Medical Equipment
Copyright© 2014 SUMIDA CORPORATION. All rights reserved.
What is a Coil ?
A coil is a wire wound in a spiral.
When a wire is wound, it takes on various characteristics
that are different from straight wire. The characteristics
are used for various electronic / electric devices and
equipment.
A Coil is an indispensable component for an
electronic device They play an important
role to maximize the performance of
electronic devices and may greatly affect
the performance of products. Sumida
designs and develops the best coils for our
customers needs.
A coil has 5 major functions and is applied
to various electronic devices. This
presentation will explain 5 function of the
coils and the characteristics of our coil
technology.
Coil: A component of an electronic
device
A coil is called the L element, capacitor C,
and resistance R.
L, C and R are passive components and
play an important role in helping the
working of IC and transistor circuits.
L, C and R are passive components
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The 5 Functions of a Coil
A Coil has 5 major functions and is applied to various electronic devices.
When a magnet
moves through a
coil, voltage
appears on both
ends of the coil.
This is known as
the
electromagnetic
induction effect.
When current
flows through a
coil, a magnetic
field is generated
and attracts
magnetic materials
(iron & nickel).
This is known as
the
electromagnetic
effect.
ElectroMagnetic
Induction
Effect
Self Induction
Effect
ElectroMagnet
Effect
Mutual
Induction
Effect
Resonance
Effect
When current flows
in the coil, the coil
resists the flow. This
characteristic is
called the self
induction effect.
Electric power or
signal can be
transferred
between two
separate coils.
This is known as
the mutual
induction effect.
Combination of a coil (L) and a
capacitor (C) generates a resonance
effect.
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The Self Induction Effect
Application of the Self Induction Effect
ElectroMagnetic
Induction
Effect
Self
Induction
Effect
ElectroMagnet
Effect
Mutual
Induction
Effect
Resonance
Effect
When current flows in the coil, the coil resists
the flow. This becomes strongly apparent at
higher frequencies. This characteristic is used in
the power supply circuit to change alternating
current (AC) to direct current (DC). If a rectifier,
instead of a coils is used, the output of the
rectifier contains a ripple current and is not a
complete DC.
input
rectifier
output
The output of a rectifier contains ripple current, and is not a
complete DC.
input
coil
capacitor
output
Combination of a coil and a capacitor works against AC, and
produces stable DC.
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The Mutual Induction Effect
Self
Induction
Effect
ElectroMagnet
Effect
Inductance is the measure of the value of a
coil. More turns makes larger inductance.
Mutual
Induction
Effect
output
Electric power can be transferred between two coils around a
core.
voltage
Resonance
Effect
input
input
output
The output voltage is determined by the ratio of turns
between the primary and secondary coils.
Copyright© 2014 SUMIDA CORPORATION. All rights reserved.
voltage
ElectroMagnetic
Induction
Effect
Application of the Mutual Induction Effect
The Transformer utilizes this effect. The
output voltage is determined by the ratio
of turns between the primary and
secondary coils.
The Resonance Effect
ElectroMagnetic
Induction
Effect
Self
Induction
Effect
ElectroMagnet
Effect
Mutual
Induction
Effect
Resonance
Effect
Application of the Resonance Effect
A certain frequency of signal is tuned by a
resonance effect. The tuning circuit that
selects a particular radio station utilizes this
effect.
current
Resonance Frequency
(frequency)
Combination of a coil (L) and a capacitor (C) generates a
resonance effect.
current
Resonance Frequency
(frequency)
A certain frequency of signal is tuned by a resonance effect.
Copyright© 2014 SUMIDA CORPORATION. All rights reserved.
The Electromagnet Effect
ElectroMagnetic
Induction
Effect
Self
Induction
Effect
Mutual
Induction
Effect
ElectroMagnet
Effect
Application of the Electromagnet Effect
An electromagnet is applied to various
equipment: ABS coils in a car, motors,
electromagnetic brakes, buzzers, doorbells,
clocks, watches, speakers, earphones, etc…
When current flows through a coil, the iron core of a coil
becomes an electromagnet.
Resonance
Effect
When no current flows through a coil, an electromagnet
effect is not generated.
Copyright© 2014 SUMIDA CORPORATION. All rights reserved.
The Electro-Magnetic Induction Effect
ElectroMagnetic
Induction
Effect
Self
Induction
Effect
ElectroMagnet
Effect
Application of the Electro-Magnetic
Induction Effect
When a magnet moves through a coil,
voltage appears on both ends of the coil.
Microphones and generators utilize this
effect.
Mutual
Induction
Effect
When a magnet moves through a coil, induced current flows.
Resonance
Effect
When a magnet does not move through a coil, current
does not flow.
Copyright© 2014 SUMIDA CORPORATION. All rights reserved.