Your DMM should have a frequency measuring option, normally indicated with "kHz" symbol, otherwise it won't help. In response to the frequency triggering, when the mosfet is in the ON state, the inductor stores the specified amount of electrical energy in it and during the mosfet OFF state reverts it to the output. This back emf from the coil constitutes the V at the ouput…. Hi Sir, sorry to ask this question here as I could not find a dc to dc step up circuit in your forum. I am thinking is it possible to modify this circuit to step up 2vdc to 12vdc?
Thank you. Dear sir , I have a battery 12v 32ah sf sonic jet , how can i charge by home made circuit ,I would like to use it as Watt CFL inverter, kindly help me to making a 3 amp constant current battery charger, thanking you, Jayanta Roy.
Bonjour Monsieur. Pour le transistor mosfet il faut celui qui peut supporter une tension de V? You can try the second circuit shown in this link, but I am not sure about the transformer details you may have experiment with its size and wire gauge:. Thank you sir, I had tried joule before but the problem is the current supply is not high enough. I need at least mA. Can I know how to increase the current or is there any way to do it?
Use parallel wire winding, meaning use two or three wires together and then wind them as per the data, this will increase the current of the transformer,also you will have to use more number of cells in parallel for supplying the required amount of current.
Obaid just take out V AC, add a step down transformer that makes it 24V and then add a bridge rectifier and two filter capacitors electrolytic 10uF 25V and a IC, u'll get 12V.
It will depend on the output voltage requirement, if the inductor is able to produce it then it would be fine. I am considering to use this transformerless circuit to provide high voltage in CDI. There is one issue i. The CDI capacitor needs HV DC for charging which is provided thru a diode half wave rectification but, this output cannot be rectified, neither thru half wave rectification nor full wave.
You can experiment with the number of turns of the inductor for getting different voltage levels at the output, because that's the only component that is directly related with voltage boosting.
The out put is sort triangular waves of AC V fluctuating between V not between and at Hz. How do we convert it to DC??? Single rectifier or bridge rectifier is not working, the output remains the same. Maybe, the simulator is experiencing some difficulties in performing the rectification.
Can this circuit be used to power a W soldering iron? If yes, would 12V-5A input be enough? I am working to use this circuit excluding the transistor network as a simple laptop charger from car battery. I am not sure if such mosfet is available because such RDS on value is for small current mosfets.
The first option looks fine, you can use a higher rated mosfet such as IRF etc. Hi Andrea, for a DC application, the above circuit could be used, but for AC devices an inverter would be more preferable. You can get high voltage at high frequency not 50Hz but the current would be around mA. Since the primary side of the transformer will handle greater current than secondary side, I have used 4 insulated copper wires together to make a group and then wound it around the bobbin.
It is a 24 AWG wire that I got from a local hardware store. The reason for taking 4 wires together to make a single wire is to reduce the effects of eddy currents and make a better current carrier.
Both the primary and secondary winding are insulated with each other using insulating tape wound around the bobbin. For details of how exactly I made the transformer ,please refer to the video at the end of this instructable. The SG is used to generate alternate clock pulses which are used to alternatively drive the MOSFETS which push and pull current through the primary coils of the transformer and also for providing feedback control to stabilize the output voltage.
The switching frequency can be set by using timing resistors and capacitors. For our application we will be having a switching frequency of 50Khz which is set by capacitor of 1nF on pin 5 and 10K resistor along with a variable resistor at pin 6. The variable resistor helps to fine tune the frequency. I have added a small 22 ohm current limiting resistor to the gate terminal of MOSFET along with a 10K pull down resistor to discharge the gate capacitor.
This is done by adding a 33 ohm resistor between pins 5 and 7 of the IC. The center tapping of the transformer is connected to the positive supply while the other two ends are switched using the MOSFETs which periodically connects the path to ground. The output of the transformer is high voltage pulsed DC signal which needs to be rectified and smoothed out.
This is done by implementing a full bridge rectifier using fast recovery diodes UF Then the capacitor banks of 3. One must make sure that the voltage reading of the caps is high enough to tolerate and store the generated voltage. For implementing the feedback I gave used a resistor voltage divider network of KiloOhms and 50K variable resistor, the output of the potentiomter goes to the input of the error amplifier of SG and thus by adjusting the potentiometer we can get our desired voltage output.
The undervoltage protection is done using an Operational Amplifier in comparator mode which compares the input source voltage to a fixed reference generated by the SG Vref pin. The threshold is adjustable using a 10K potentiometer. As soon as the voltage falls below the set value, the Shutdown feature of the PWM controller is activated and the output voltage is not generated.
This is the entire circuit diagram of the project with all the previously mentioned concepts discussed. Before soldering all the components on veroboard, it is essential to make sure that our circuit works and the feedback mechanism works properly.
Always keep safety in mind and make sure you don't touch any component while the power is still on. The electrolytic capacitors can hold the charge for quite sometime so make sure it is completely discharged.
After successfully observing the output voltage, I implemented the low voltage cut-off and it works fine. Now before we begin to start the soldering process, it is important that we fix the position of components in such a way that we have to use minimal wires and relevant components are placed close together such that they can be easily connected suing solder traces.
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