Panasonic is part of a large worldwide groupselling relays and associated switching products under different brand names in different territories.The conditions of use in some territories may differ from those customary in Europe. In particular there are often major differences in regard to national and international specifications, such as UL, CSA, VDE, SEV, EVE, SEMKO, etc. Thus, when considering contact loads as stated in this catalogue (e.g. 10 A, 30 VDC for the SP relay) its hould be understood that these values are not necessarily an absolute maximum but tested ratings. Mostly the stated value has been tested for a certain life expectancy as stated by the manufacturer or the respective test house. Thus, under different conditions, the stated “maximum” may, in practice, be safely exceeded.
Applications Relays Electronic Circuits
APPLICATIONS RELAYS ELECTRONICCIRCUITS
[1] RELAY DRIVE MEANS TRANSISTOR
1. this voltage exceeds the
breakdown voltage the transistor, the
transistor will degraded, and this will
lead damage.
(Care) Emitter connection
When the circumstances
make the use this
connection unavoidable, if
the voltage not
completely impressed on
the relay, the transistor
does not conduct
completely and operation is
uncertain.
As suitable ratings for this diode, the
current should equivalent the
average rectified current the coil, and
the reverse blocking voltage should be
about tim the value the power
source voltage. absolutely
necessary connect diode the
circuit means preventing damage
from the counter emf.
ds x61
C tic ts
• The common itter resistor must
have value sufficiently small
en_relay_technical_information_091112D
.
Non-pulse signal Pulse signal (square wave)
(Good) Snap action)
4 tio n
C it)
(W ave rectifying circuit)
24
W hen the input signal does not produce a
snap action, ordinarily Schm idt circuit is
used produce safe snap action.
(Care) Parallel connection
When the power consumed
by the complete circuit
becomes large, consideration
of the relay voltage is
necessary. tio d
If the relay transistor driven, we
recommend using with collector
connection.
The voltage impressed the relay is
always full rated voltage, and the OFF
time, the voltage com pletely zero for
avoidance trouble use.
2 e
B lta y
C r
If the coil current suddenly interrupted,
a sudden high voltage pulse developed
in the coil. you need reduce this
tim delay you can connect between the
transistor's collector and itter Zener
diode that will make the Zener voltage
som ewhat higher than the supply
voltage.
(Good) Collector connection
With this most common
connection, operation stable.
Take care the “Area Safe Operation
(ASO)”
3 tio n
(Characteristic relay with voltage rise
and fall voltage)
Unlike the characteristic when voltage is
impressed slowly the relay coil, this is
the case where necessary impress
the rated voltage short tim and also
to drop the voltage short time.
Connection diode excellent way
to prevent voltage surges, but there will
be considerable tim delay when the
relay open
