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〖2, switch concept〗
Is used to connect and disconnect the circuit components. Switches used in various
electronic devices, household appliances.
?Classification
By Use: wave switch, band switch, playback switch, power switch, pre-selection
switch, limit switch, control switch, transfer switch, isolation switch.
Divided by the structure: slide switch, toggle switch, toggle switch, button switch, key
switch, membrane switch.
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?The main parameters
a. Rated Voltage: refers to the switch during normal working hours allowed by the
safe voltage. plus the voltage across the switch is larger than this value will cause
ignition breakdown between the two contacts.
b. Rated current: that when the switch is allows the maximum safe current. When
more than this value, the switch contact will be too large for current burning.
c. Insulation resistance: refers to the conductor part of the switch resistance and
insulation value. insulation resistance should be more than 100MΩ.
d. Contact resistance: refers to the switch in the on-state, between each pair of contact
resistance. generally requires 0.1-0.5Ω below this value the smaller the better.
e. pressure: refer to switch between the conductor and the ground can bear the
minimum voltage.
f. life: is the switch in normal operating conditions, to the number of operations.
generally requires about 5000-35000 times.
?Photoelectric switch
1 Overview
Photoelectric sensor switch is a member of a large family, it put between the
transmitter and receiver changes the intensity of light into a current in order to achieve
the purpose of detection. As the optical switch output circuit and input circuit is
galvanically isolated (ie, margin call must), so it can be applied on many occas ions.
Photoelectric sensor switch is a member of a large family, it put between the
transmitter and receiver changes the intensity of light into a current in order to achieve
the purpose of detection. Since photoelectric switch output circuit and input circuit is
galvanically isolated (that is absolutely electric edge), so it can in many cases applied.
Using integrated circuit technology and SMT surface mount technology and
manufacturing of next- generation optical switching devices, with delay, stretching,
external synchronization, anti- interference, high reliability, stability and work areas
such as intelligent self-diagnosis function. This novel optical switch is an active pulse
modulation photo detector electronic switch, it uses a cold light source with infrared
light, red light, green light and blue light, etc., can be non-contact, no

				
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