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Registered Member #3267
Joined: Sun Oct 03 2010, 07:39AM
Location:
Posts: 3
Hi. Marko
I am trying to built the oscillator circut as you designed. berfore that, I built it with bread board and I used 12V 1A adaptor as power supply. When i check the circuit, Vpp was 70V, Frequesncy was 1.5MHz and i couldn`t check the current. now I am trying to make it with board.
the question is the current of power supply(Adaptor) someone told me I need to use 12V at least 8A power source. But I don`t understand why... How much current do i need to operate this circuit?
Registered Member #3267
Joined: Sun Oct 03 2010, 07:39AM
Location:
Posts: 3
If It is correct (12V at least 8A). I am going to use 12V 7A OR 12V 10A Adaptor. Is it OK?? And i used 1mm copper wire for wiring of my circuit borad (Universal PCB)
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi guys,
The purpose of the relay is to act as a primitive undervoltage lockout circuit - basically it won't turn the circuit on until the voltage has risen to the safe level. I intended to use an electronic circuit for it at first, but it turned out more complex than the royer oscillator itself and I thought everyone would just be easier to use a relay.
I never got any simulation software to simulate this circuit successfully either, they simply fail miserably in it.
The transmitter shouldn't need 8A unless it's driving a really heavy load. Most the circuit in my pictures drew was about 1.7A, and 2 to 3 amp supply should be sufficient.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi guys,
If you make the coil bigger it will result in more inductance, higher characteristic impedance and hence lower power draw (and throughput) than with smaller coil, unless you increase your capacitance proportionally too.
I encourage you to play as much as you can with the coil diameters and capacitances - I now think that Mhz range frequency is unnecessary for this application and that 100-200kHz might be more efficient for the capacitors and skin effect wise.
If both of your mosfets are heating, the circuit is either working or something is wired very wrong (normally only one mosfet should short if the oscillation ceases). Best way to check your connections is to follow mspaint schematic on first page. You don't need the relay for the beginning, a switch on the power supply is enough.
Unloaded the circuit should draw no more than an amp in any case.
Registered Member #3354
Joined: Sun Oct 24 2010, 09:48AM
Location: Tulkarm-Palestine
Posts: 10
hanys wrote ...
Elecric eng check out the lauout that you posted, i think that the raley is wrong conected.
Is it possible, that a large current is flowing in the transmiter, when there is no load?
i made the circuit on a bread board, but i think it's shorting, but both MOSFETS are heating...
hi hanys!! I checked the lauout .. but i didn't know what is wrong!! common pin shorted with the +ive power supply .. the NC connected to the Chockes and NO is connected to the Rs and individual Caps .. isn't that what should be?!!
What make me crazy that neither the first mosfet nor the second one was heated up when i used the bread board!! .. I knew that the bread bord can not handle the large current .. eventhough i risked to burn the board up just to prove the idea which i couldn't ..
PS. I used 50 cm long loop with 8mm thickness .. other components are all the same as suggisted
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
What make me crazy that neither the first mosfet nor the second one was heated up when i used the bread board!!
That's not surprising at all considering your relay actually disconnects power from the mosfets when it goes on, I leave it up to you to figure out why. Circuits like this are really great way to learn about components in first place!
Registered Member #3354
Joined: Sun Oct 24 2010, 09:48AM
Location: Tulkarm-Palestine
Posts: 10
Marko wrote ...
What make me crazy that neither the first mosfet nor the second one was heated up when i used the bread board!!
That's not surprising at all considering your relay actually disconnects power from the mosfets when it goes on, I leave it up to you to figure out why. Circuits like this are really great way to learn about components in first place!
Marko
I know what do you mean ... I think that I should short +ive power supply ( or common pin of the relay ) with the NC pin of the relay .. isn't it? I tried this when i used the bread board but it dosn't work also .. the relay never become on (the led do not light ) and the relay has a noise sound !!
I'm in step that I just need to build it as everybody does .. when it's work i'm going to analyse it and improve it ( as H hope )
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Miniature wireless power demonstrator
just to prove the idea which i couldn't ..
)