Thursday, 28 July 2011
Sunday, 10 July 2011
Laptop Fan
Laptop Fan :
PC (personal computer) , a quite big structure has a fan for cooling purpose. But in case of Laptops how this is possible? The thickness of laptops are being reduced often. How is it possible to place a cooling system in a slim structure?
But the answer is so simple. The arrangement is as shown in image below :
You may see a golden brown strip like one. This is nothing but the copper (Cu) strip. Can you mention any one property of copper?
Yes, absolutely. It is a good conductor of heat and electricity. This Copper Strip is placed above the processor. When processor is turned on, it ultimately gets heated. This heat in turn will be transmitted all along the copper strip. Since heat travels from more heated end to less heated end , we can place our fan at this end. Now we 'll make some provision so that the heat may be liberated from the system to external environment.
So there is no need that the fan should always be at the top of the processor. It can be parallel to the processor also. No matter where is the fan, is heat getting away? Cool !
for more details : chancer.bone@gmail.com
PC (personal computer) , a quite big structure has a fan for cooling purpose. But in case of Laptops how this is possible? The thickness of laptops are being reduced often. How is it possible to place a cooling system in a slim structure?
But the answer is so simple. The arrangement is as shown in image below :
You may see a golden brown strip like one. This is nothing but the copper (Cu) strip. Can you mention any one property of copper?
Yes, absolutely. It is a good conductor of heat and electricity. This Copper Strip is placed above the processor. When processor is turned on, it ultimately gets heated. This heat in turn will be transmitted all along the copper strip. Since heat travels from more heated end to less heated end , we can place our fan at this end. Now we 'll make some provision so that the heat may be liberated from the system to external environment.
So there is no need that the fan should always be at the top of the processor. It can be parallel to the processor also. No matter where is the fan, is heat getting away? Cool !
for more details : chancer.bone@gmail.com
Laptop Battery
Battery types :
Ni-Cd (Nickel Cadmium) batteries
Nickel metal hydrate batteries
Lithium (Li) ion batteries
Lithium (Li) polymer batteries
Battery Properties:
Voltage : 9.6 V
Current : 3800 mA (milli Ampere)
(These values are mostly used. May vary in some batteries).
Safety Circuit :
One popular question arises in everyone's mind. "What happens if my laptop is being plugged in power socket even after it has been fully charged ?" .
Practically speaking we cannot unplug the charger pin, as soon as battery gets fully charged. Here comes the safety circuit. Safety circuit is made up of PTC(Positive Temperature Coefficient). It is one kind of thermistor. Thermistor's resistance value depends upon temperature. PTC has a property, where resistance value is directly proportional to temperature (i.e as temperature increases resistance also increases and as temperature decreases resistance also decreases).
The safety circuit has three different stages :
- Starting stage
- Charging stage
- Cut-off stage
The third stage (cut-off stage) helps the extra power to be grounded preventing the current from not entering the battery.
So now no worries.
"Just plug and play".
Thanks to the safety circuit.
For more details : chancer.bone@gmail.com
Ni-Cd (Nickel Cadmium) batteries
Nickel metal hydrate batteries
Lithium (Li) ion batteries
Lithium (Li) polymer batteries
Battery Properties:
Voltage : 9.6 V
Current : 3800 mA (milli Ampere)
(These values are mostly used. May vary in some batteries).
Safety Circuit :
One popular question arises in everyone's mind. "What happens if my laptop is being plugged in power socket even after it has been fully charged ?" .
Practically speaking we cannot unplug the charger pin, as soon as battery gets fully charged. Here comes the safety circuit. Safety circuit is made up of PTC(Positive Temperature Coefficient). It is one kind of thermistor. Thermistor's resistance value depends upon temperature. PTC has a property, where resistance value is directly proportional to temperature (i.e as temperature increases resistance also increases and as temperature decreases resistance also decreases).
The safety circuit has three different stages :
- Starting stage
- Charging stage
- Cut-off stage
The third stage (cut-off stage) helps the extra power to be grounded preventing the current from not entering the battery.
So now no worries.
"Just plug and play".
Thanks to the safety circuit.
For more details : chancer.bone@gmail.com
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