Why Diode used in Solar Panel, Relay and Soldering Iron?


The diode used in Solar panel for two reasons, one is to bypass the current, another is to block the reverse current flow to the solar panel from the battery. The diode is used in Relay to provide a path for discharging the stored energy in the relay magnetic coil when the power supply is removed from the relay coil. The diode is used in Soldering Iron to reduce the input power flow to the soldering iron heating element to prevent the overheating.


There is a huge application of diode. There are some devices which use diodes for some important reasons. There are some important frequently asked questions i.e. Why Diode used in Solar Panel, Why Diode Used in Relay, Why Diode used in Soldering Iron. So in this article, you will find the answers to those questions in detail.





Why Diode used in Solar Panel?



There are two reasons to use diodes in a solar panel. Generally, the PN Junction diodes are used in solar panels. The first reason is to bypass the current. The diode used in solar panel to bypass the current is called Bypass Diode. The Bypass Diode is connected in parallel and reverse bias with an individual solar panel when we using a no of solar panels together.



Solar panel diagram, Solar panel connection with diodes


In case, if any panel is damaged or sun rays not properly reach that solar panel then the bypass diode works and bypass the current. You can see in the above figure the solar panel A is damaged, so in this case, the bypass diode connected with the solar panel A will bypass the current.



The Blocking Diode is used in Solar Panel to block the reverse power flow. Suppose we connect a solar panel to a battery for charging. When the solar panel getting proper sun rays it creates sufficient voltage to charge the battery and in this case, the current will flow from the solar panel to the battery. But when the sun rays decrease, then the solar panel will create lower voltage than the battery and current will flow from the battery to the solar panel.



Solar Panel Diode Connection


So the Blocking Diode prevents the current flow from the battery to the solar panel. The Blocking Diode also prevents the current flow from one string of panels to another string.




Why Diode Used in Relay?


You may notice a PN Junction Diode is always connected with the magnetic coil of the relay in parallel and reverse bias. So you may think why diode is connected in parallel with the relay coil.


Relay Circuit, Relay Connection, Diode Connection with relay


The diode used in the relay is called the freewheeling diode. We know that the inductive coil has the property that when a current flow through a coil it storing electrical energy in the form of a magnetic field and when we stop the flow of current, the coil will discharge the stored energy to the external circuit connected with it. When we used a relay in a circuit, we need to give power supply to the magnetic coil of the relay for its operation.


When the power supply to the relay is turned OFF, it will discharge energy to the circuit and may damage the circuit. But when a diode is connected with the coil of the relay, it creates a path for discharging current. So when the power supply to the Relay is turned OFF, the coil discharges its stored energy through the diode, therefore the circuit will safe from damaged.



Why Diode used in Soldering Iron?


A PN Junction Diode is used in Soldering Iron to reduce the power input to the soldering iron. The diode is always connected in series with the heating element. If the heating element is connected directly to the power supply it will overheat. But when a diode is connected in series with it the heating will be maintained.


Soldering Iron Parts, Diode in soldering iron


The diode in soldering iron acts as half wave rectifier. During the positive half cycle, it will conduct current and the heating element will get the power supply. During the negative half cycle, the diode blocks the power supply to the heating element. So the diode continuously ON/OFF the power supply to the soldering iron and prevent overheating. Actually, the diode reduces the power to 50% of the actual power input.


Soldering Iron Circuit


In some soldering iron, LED(Light Emitting Diode) is used which provides two facilities, one is reducing power and another is indication that says the soldering iron is ON or OFF.



Read Also


Thank you for visiting the website. keep visiting for more updates.


Why Diode used in Solar Panel, Relay and Soldering Iron? Why Diode used in Solar Panel, Relay and Soldering Iron? Reviewed by ETechnoG on 19:59 Rating: 5
Powered by Blogger.