參數(shù)資料
型號(hào)： ord228vl
廠商： OKI SEMICONDUCTOR CO., LTD.
英文描述： Reed Switch(舌簧開(kāi)關(guān))
中文描述： 干簧（舌簧開(kāi)關(guān)）
文件頁(yè)數(shù)： 26/145頁(yè)
文件大?。?/td> 729K
代理商： ORD228VL
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24
REED SWITCH
PRECAUTIONS AND APPLICATIONS
PRECAUTIONS AND APPLICATIONS
1.
Contact Protection Circuit
When a reed switch is to be connected to
the inductive load or the load where surge
current or rush current flows (such as
capacitance load, lamp, long cable, etc.),
the following contract protection circuits
are also required for the red switch.
1-1 Inductive loads
In case an electromagnetic relay, electro-
magnetic solenoid, or electromagnetic
counter which has inductance component
is provided as a load in a circuit, the en-
ergy stored in the inductance will cause an
inverse voltage when the reed contacts
break. The voltage, although dependent
on the inductance value, sometimes
reaches as high as several hundred volts
and becomes a major factor to deteriorate
the contacts. In order to prevent this many
protection circuits are provided, typical
examples of which are shown in Fig. 1.1.
+E
Load
b) Contact protection by varistor
When the contact open time is
long, varistor should be put into
the load terminal.
+E
Load
R
C
a) Contact protection by capacitor
and resistance
(Also possible at the load
terminal.)
I(A)
C10
I
2
R= E
W
]
10I( )
I+E/50
Load
+E
c) Contact protection by diode
Breakdown voltage of diode
should be larger than E volt.
Forward current of diode
should be almost equal to
5E/coil resistance.
Figure 1.1
1-2 Capacitive loads
In case a capacitor is provided in series or
in parallel with the reed switch contacts in
a closed circuit, the rush current which
flows at the time of charge and discharge
of the capacitance will cause much dete-
rioration of the reed contacts. Fig. 1.2 shows
typical examples of the protection circuits
to prevent the rush current.
d) Resistance (R) is installed in the circuit
to protect contact. R should be between
50 and 500
W
R
O
C
+E
R
K
I
S
a) Current limiting resistance(R
) is installed
in the circuit to protect contact. Rk(
W
) should
satisfy the equation below.
Is= < 0.I(A)
K
Figure 1.2
R
O
+E
C
R
R
I
1-3 Lamp load
In case of the lamp load, a tungsten fila-
ment lamp is generally used. The tung-
sten filament lamp features that its resis-
tance is small immediately before it is
switched on and will become larger after
switched on, followed by lighting with
steady-state current. If the reed switch is
used for switching in this lamp circuit, the
rush current (5 to 10 times the steady-state
current) will flow in the contacts immedi-
ately after the lamp being turned on, and
often cause melting or sticking of the reed
contacts. The circuit with a lamp load is,
therefore, considered similar to a circuit
E2R0008-37-21
相關(guān)PDF資料
PDF描述
ord229 Reed Switch(舌簧開(kāi)關(guān))
ort233 Reed Switch(舌簧開(kāi)關(guān))
ord2212 Reed Switch(舌簧開(kāi)關(guān))
ord213 Reed Switch(舌簧開(kāi)關(guān))
ord219 Reed Switch(舌簧開(kāi)關(guān))
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ORD228VL(1719) 制造商:ROHM Semiconductor 功能描述:Reed
ORD228VL(1920) 制造商:ROHM Semiconductor 功能描述:Reed
ORD228VL/10-15 AT 功能描述:磁性/簧片開(kāi)關(guān) 1 Form A 14mm AT 1015 OKI RoHS:否 制造商:MEDER electronic (Standex) 開(kāi)關(guān)類型:Reed 觸點(diǎn)形式:1 Form A (SPST-NO) 觸點(diǎn)額定值:10 VA 操作范圍:10 At to 50 At 工作間隙: 磁鐵類型: 顏色: 端接類型:Axial 封裝:Bulk
ORD228VL/10-15AT 制造商:MEDER Electronic 功能描述:
ORD228VL/15-20 AT 功能描述:磁性/簧片開(kāi)關(guān) 1 Form A 14mm AT 1520 OKI RoHS:否 制造商:MEDER electronic (Standex) 開(kāi)關(guān)類型:Reed 觸點(diǎn)形式:1 Form A (SPST-NO) 觸點(diǎn)額定值:10 VA 操作范圍:10 At to 50 At 工作間隙: 磁鐵類型: 顏色: 端接類型:Axial 封裝:Bulk
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