How to make Wireless Power Charger

By: DoYouKnow.IN | Views: 10017 | Date: 22-Oct-2012

In this article we tell you how to make wireless charger.Here U can get Interesting things & updated with current happenings and general knowledge questions with answers.

In this article we tell you how to make wireless charger.

Step 1: Apparatus Required for wireless charger

How to make Wireless Power Charger

2 MOSFETS - You can use the IRFP250. However, the lower the on-state resistance is, the less heat will be generated.

2 10k ohm resistors – (brown black orange) you can use 1/4 watt ones.

2 Ultrafast Diodes – They need to be above 400 volts. I used UF4007′s.

2 Twelve volt zener diodes – Nothing to say!

1 7805 – It is used as boost converter. However, a boost converter is a whole another instructable, and I can’t explain how to build one in this. So, for now, we’ll just use a 7805.

2 18k ohm resistors – 1/4 watt (brown – gray – orange)

2 12k ohm resistors – 1/4 watt (brown – red – orange)

USB Female Port – I scavenged mine from an old adapter PCI board we had from 2000. We didn’t need it.

Two sets of tank capacitors – I used four 1 uF capacitors for mine. You can use two 2 uF capacitors instead, if you want to. You NEED to make sure they’re MKP, or a better type! Polyester ones, electrolytic, anything along those lines will not work, and will overheat!

You’ll also need some wire.

Note: suppose that transmitter coil is primary coil. (Same as like in the transformer)

Step 2: Schematic diagram of wireless charger.

How to make Wireless Power Charger

To build it, just follow the schematic diagram of wireless charger as shown in the figure. If you’re having trouble identifying the MOSFET’s pins, look up the part number of the MOSFET you’re using, and follow what it says on there.

For those following it to the book, the IRFP250′s pin out goes like this, from left to right; Gate, Drain, and then Source.

If you mess this up, your MOSFETs will almost certainly go boom!

For the diodes, the black band on it, or the white band on the UF4007′s indicates the cathode. The other end is the anode.

Mind you, this is just for the transmitter!

The higher the input voltage, the more distance you should get out of your transmitter. Remember, though, at this comes a cost; the mosfets will get warmer, and your current draw will increase!

Step 3:    Receiving section of wireless charger.

The receiving section of wireless charger is same as like bridge rectifier (in which four diodes are connected to the transformer)

The receiving section is less complex. Make sure you use the same capacitor value! Make sure you follow the USB pin out as I have written in the schematic.

Note: suppose the receiver coil is secondary coil (same as like in the transformer)

The performance of wireless charger is depends on the coil’s no. of turns of primary coil andsecondary coil.

If the distance between two coils is more, then current draws more, another way of possibly increasing distance is to increase the resonant frequency a bit.

You can try and experiment with different turns ratios of the coils and see what kind of performances you get! This has to do with resonance, and step-up / step-down ratios.

Try adding more voltage in the transmitter section of the wireless charger for more distance, increasing the frequency should give you more distance, with additional current draw.

Remember that this idea is not only for USB. You can do a lot with 5 volts output voltage of this wireless charger!

You can use this output voltage anywhere you want like for LED, CFL, mobile charger etc.

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