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Electronic Flashers are used in automobiles
to provide Turn Signal Indication while turning
to either side and are also used to give
a Hazard Warning in case of any problem.
Electronic Flashers are of three types
depending upon the supply :
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1) A.C. Flashers
2) D.C. Flashers
3) Six Terminal Flashers for Tractor
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Our A.C. Flashers are fully solid state and do not have any Electro-mechanical part.
This decreases the chance of failure as there
is no moving part in the flasher also the
whole unit is epoxy sealed which ensures
that no water gets inside the Flasher. AC
flashers are usually used in two wheelers
with AC systems i.e. magneto. |
ELECTRONIC FLASHERS FOR TWO WHEELERS
(ELECTRO-MECHANICAL OR SOLID STATE)
Contemporary automotive systems have a choice
of either Electro-mechanical (relays) or
solid state switching systems. Conventionally
mechanical switches (relays) have been used
in automobiles as they provide a cheap solution,
but they do have their limitations. The flashers
controlled by solid state switches overcome
all these limitations and offer a more reliable
and efficient flasher.
Relay based flashers have the following limitations:
Reliability: To achieve the required levels of sensitivity
and efficiency the relay coils have to be
wound with many turns of
very fine wire.
This wire is susceptible to damage under high mechanical stress-vibration
and shock, conditions to which, a two wheeler is frequently subjected.
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As there
are no moving parts in a solid state flasher
and the switching is controlled by fully
electronic means the solid state flashers
offer a good solution to this problem.
Dissipation : The power loss in a relay coil is not
negligible and causes a gradual degradation
of the circuit.
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Limited switching life : The relays have an upper limit to the
number of times it can switch the load. This
limits the life of the flasher and causes
failure of the flasher after some time of
use. However in a solid state flasher no
such problem exists.
Temperature : The maximum operating temperature of solid
state devices is much higher than that of
relays, this makes them suitable for automotive
applications and gives them an edge over
the conventional relay based systems.
In relays when the electrical contact breaks
it causes a spark at the contact points which
gradually deteriorates the contact and causes
the deposition of carbon at the contacts.
After some time the contact between the relay
terminals deteriorates and the full current
doesn’t flow through them.
The solid state systems are thus a far superior
option over the conventional relay based
systems.The solid state systems are available
for both A.C. and D.C. systems for two wheelers.
Go Top
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| D.C. Flashers offer the following advanced
features over the conventional Flashers available: |
1. INTERGRATED CIRCUIT CONTROLLED
2. WIDE OPERATING VOLTAGE
3. LOAD IMBALANCE IMMUNE
4. LEAKAGE RESISTANCE PROTECTED AS
PER "FORD ENGG. SPECIFICATION".
5. REVERSE POLARITY PROTECTED
6. MODULED CLAMP BRACKET
7. EPOXY SEALED
1) Integrated Circuit Controlled : The "Flash Rate" and the "%
ON Time" i.e. duty
cycle of our flashers
is controlled by Integrated
Circuit. This
technology is far superior
to the one used
by conventional flashers
which use transistors
for control. The use of
IC's (integrated
circuits) ensures a uniform
Flash rate and
Duty cycle under all permissible
conditions
of voltage and load. (Ref.
graph in fig.
1-4)
2) Wide Operating Voltage : Our flashers are designed to operate over
a wide range of voltage varying from 10V
to 15V. This ensures that the flasher flashes
at the same rate and with the same duty cycle
even when the battery of the vehicle is undercharged
or overcharged. (Ref. graph in fig.1 &
3)
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3) Load Imbalance Immune (L.I.I.) : In conventional Flashers the Flash Rate
increases as the load decreases i.e.
as soon as the lamp gets fused the flash
rate increases, however this is not understood
by the consumer and if the lamp is not replaced
immediately then the life of the flasher
comes down substantially by about 30% and
the rate of field failures increases.
To overcome this problem we have introduced
a unique system called Load Imbalance Immune
(L.I.I.). The flash rate and the duty cycle
remain constant under all conditions of load
right from 1 lamp to all the 4 lamps. With
this feature not only does the flasher operation
become highly stable but also increases the
life of the flasher unit substantially &
decreases the chances of field failure in
case of fused lamps by about 30%.(Ref. graph
in fig. 2 & 4).
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4) LEAKAGE RESISTANCE PROTECTED AS PER "FORD
ENGG. SPECIFICATION." Conventional flashers start chattering if
they are not protected against leakage resistance.
This problem is predominant in rainy seasons
and in slushy areas. Due to leakage the resistance
between the flasher terminals falls to a
value low enough to make the flasher chatter.
This considerably reduces the life of the
flasher and may also cause the relay to fail.
To over come this problem we have designed
our flashers as per engineering specifications
laid down by Ford. Our flashers are protected
against leakage resistance to have a superior
performance.
The leakage resistance of a flasher can be
tested by connecting a resistance of 2.5
KWbetween the load and earth terminals with
the load completely disconnected . As soon as the supply is given to the flasher,
it should not start operation.
5) REVERSE POLARITY PROTECTED : Our flashers are protected against reverse
polarity. Even when the supply and earth
terminals are interchanged the flasher circuit
does not fail, however due to the inherent
protection provided in the circuit the flasher
stops operating under reverse polarity connection
and operates only when the correct polarity
is applied at the terminals of the flasher.
6. MOULDED CLAMP : The mounting clamp is molded in the body
of the flasher, which does not let the body
of the flasher out of the clamp because of
the engine vibration.
7. EPOXY SEALED : The flasher is sealed with Epoxy to ensure
that water does not get inside the flasher
and cause failure. This gives our flashers
the capacity of being installed even in the
bonet of the vehicle without any problem.
Go Top
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SIX TERMINAL ELECTRONIC FLASHER FOR TRACTORS
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The tractor is used in remote areas where
there is not adequate lighting. As a result
of which when the driver gives a signal to
turn it is not clear to the vehicle coming
behind as to which direction the tractor
is going to turn because there is no reference.
This problem is not observed in urban towns
and metropolitans as the roads are well lit
To overcome this problem it is recommended
to use a six-pin flasher, which works on
a different principle as compared to a conventional
flasher. In a conventional flasher if the
driver gives a turn signal to turn towards
the left, only the lamps connected to the
left side of the tractor start flashing.
However in a six-terminal flasher if the
driver gives a signal to turn towards left
then the lamps connected to the left side
start flashing and the lamps connected to
the right side become permanently on.
This creates a reference for the vehicle
coming behind that with respect to
the right side lamps the tractor's driver wants to turn towards left. Similarly
when the signal for turning towards right
is given, the lamps connected to the right
side start flashing and the lamps connected
to the left side become permanently on.This
feature is very useful and is currently being
used by other tractor manufacturers such
as M/S Escorts Tractors Ltd., M/S Escorts
Farmtrac Ltd. All the tractors, which are
exported from India, have to have this feature.
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