BATTERY CHARGER USING SCR PDF
Battery Charger Circuit Using SCR. Introduction to SCR: SCR is abbreviation for Silicon Controlled Rectifier. SCR has three pins anode, cathode and gate as. Get an idea about circuit diagram of Battery Charger Circuit Using SCR by reading this post. You may also read about SCR - operating modes and applications. I would also like to thank Kelvin Omondi for his support in using his computer. This project requires the design of an SCR controlled battery charger with.
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Junaid Mandviwala for the guidance and valuable suggestions during the entire course of the Mini Project titled “Battery Charger Circuit Using SCR”. We also. This 12V SCR battery charger circuit differs from the norm in a number of ways, all of which make it difficult to understand. The smart battery charging system integrated an Astable Multivibrator using LM OP-AMP. 18 Final battery charging verification. 37 .. http:// dovolena-na-lodi.info
Battery Charger Circuit Using SCR
When the transistor is turned on the SCR will get off. When the battery voltage is dropped the forward bias will be decreased and transistor gets turned off.
When the transistor is turned off automatically the diode D1 and resistor R3 will get the current to the gate of the SCR, this will triggers the SCR and gets conduct. This will charge the battery when the voltage drop in the battery decreases the forward bias current also gets increased to the transistor when the battery is completely charged the Transistor Q1 will be again turned on and turned off the SCR.
The AC signal is rectified using a SCR and a comparator is used to detect the battery charge voltage with respect to a reference voltage so as to control the switching of the SCR.
Principle Behind this Circuit The principle behind the circuit lies in controlling the switching of an SCR based on the charging and discharging of the battery. Here the SCR acts as a rectifier as well as a switch to allow the rectified DC voltage to be fed to charge the battery. In case the battery gets fully charged, this situation is detected using a comparator circuit and SCR is turned off. When the battery charge drops below a threshold level, the comparator output is so as to turn the SCR on and the battery gets charging again.
Here the comparator compares the voltage across the battery with a reference voltage. Suppose we are using a 6 cell, 9V Ni-Cd battery with an ampere hour rating of 20Ah and a single cell voltage of 1. This would set the required optimum battery voltage to be around 9V. For a voltage of 9V across the potential divider, the voltage across the pot and resistor should be above 5. For this purpose we select a potential divider arrangement consisting of 22K resistor, 40K resistor and a 20k pot.
Output current from LM is about 50mA and since here we are using transistor BC with a low base current, we require a resistor of about ohms. Primary of the transformer is connected to V AC supply whereas the secondary is connected to the rectifier. Initially when the circuit is powered and the battery level is below the threshold voltage, the circuit performs the task of charging the battery.
It then starts rectifying the AC voltage, though only for the half cycle. The first part is the master controller.
The second part is the generator controller. During the power optimization stage, the master controller adjusts the system rotation speed to keep the optimal tip speed ratio. The speed regulation works by controlling the power of the generator. During the wind power limitation range, the master controller regulates the pitch angle to limit the wind power utilization.
The generator controller is in charge of accurately controlling the active power of the system. The generator controller adopts the stator flux oriented vector control strategy. This thesis intends to propose and construct the charge controller portion of wind power system. The block diagram of the wind power system is shown in fig3.
Figure 2. The charge controller is built around semiconductor switches silicon controlled rectifier-SCR rather the electromechanical switches relays. The microcontroller is used to control the overcharging of the battery, to display the battery voltage continuously and to make audible alarm when the battery is fully charged. Firstly the battery is charged using high current through the SCR. When the battery almost reaches its full terminal voltage full charge high current charging is cut off and slow charging trickle charging is still done.
At full charge condition the charging is totally cut out by the control of the microcontroller.
The current coming from the wind turbine through the converter circuit is diverting to another load e. By this means the overcharging of the battery is prevented. The constructed charge controller can charge the 12 V battery with up to 6 A of current. The amount of charging current can be increased by changing some components in the charge controller without any difficulty.
The charge controller circuit will charge the 12 V battery until the battery gets its full terminal voltage. The charge controller changes from normal charging mode into the tickle charging mode when the full terminal voltage full charge of the battery is reached.
In the tickle charging mode the battery is slowly charged. The charging of the battery is totally cut off by the control of microcontroller at the end. The battery full charge audible alarm is also activated when the battery is fully charged.
Therefore the damage of the battery from the overcharging can be avoided. The components used in the circuit can withstand up to 6 A of charging current. By changing some components used in the [Type text] Page 8 circuit, the charge controller circuit can be modified to charge the battery up to A of charging current. Now it is the time to articulate the research work with ideas gathered in above steps by adopting any of below suitable approaches.
At any time the voltage difference between the anode and the cathode of SCR1 is the instantaneous value of half sine wave and the voltage of the battery. When the battery voltage is low the voltage difference between the anode and cathode of SCR1 is high.
On the other hand, the voltage difference between the anode and cathode of SCR1 will be low if the battery voltage is high. Therefore the battery voltage becomes when the battery is charged. In this condition, the voltage difference between the anode and cathode of SCR1tends to be low.
This fact is the main idea of this charge controller circuit. The SCR controlled battery charger circuit is shown in Fig3. SCR has three pins anode, cathode and gate as shown in the below figure.
It is made up of there PN junction diodes also; it is solid state equivalent of gas filled triode and has around four semi conductor layers.
One Reply to “Fabrication of an Automatic Battery Charger Using SCR”
The SCR can be triggered only at the gate through the current. SCR will combine the features of rectifier and transistor. They are mainly used in switching applications. They can also be triggered with the break over voltage if the forward voltage is more than the break down voltage of the component. They are mainly used in the high voltage and high power for controlling purpose.
They are also used in the light dimming, voltage regulators, motor control etc.
Even if we remove the gate voltage also it will be in conduction. The only way to make the SCR to turn off is to make the voltage to zero or make the current less than the handling current between the anode and cathode. And second way is to supplying the voltage to operate the SCR with less than break over voltage and applying the small amount of about 1. The supply voltage will increased from initial value zero when it reached to A as shown in the graph below and start conduction from this point also it there will be the voltage drop due to the load resistance and fall down to point B.
This current triggers the gate and switch on SCR and decreases the resistance and start conduction and goes to point C. In Reverse bias that is cathode will be at positive terminal and anode will be at negative terminal at this point there will be very small leakage current at anode. Fig 4. We know that to turn on the SCR we need to increase the supply voltage equal to break over voltage or by giving the small voltage to the gate for triggering, by this we can turn on the SCR; we can turn off the SCR by decreasing the current to less than holding current, or we have another method called force communication in this we discharge a capacitor in parallel with SCR to make it turn off; by this we can use SCR as typical SWITCH.
SCR can be used in half wave rectifier, full wave rectifier, inverter circuits, power control circuits, static contactor, over light detector, speed control circuit, crowbar circuit, automobile ignition circuits, etc [Type text] Page 12 4.
Battery Charger Circuit Using SCR (1)
A step down transformer: is one whose secondary voltage is less than its primary voltage. It is designed to reduce the voltage from the primary winding to the secondary winding. As a step-down unit, the transformer converts high-voltage, low-current power into low- voltage, high-current power. Semiconductor diodes were the first semiconductor electronic devices. BJTs can be used as amplifiers, switches, or in oscillators. Bipolar transistors are so named because their operation involves both electrons and holes.The SCR can be triggered only at the gate through the current.
The half wave rectifier makes the charging and discharging quite slow. There is gradual decreasing of current according to the load of battery. Log In Sign Up.
Suppose we are using a 6 cell, 9V Ni-Cd battery with an ampere hour rating of 20Ah and a single cell voltage of 1. Its purpose is to keep the batteries properly fed and safe for the long term. Popular in Electromagnetism. Thanga Muthu.
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