Author Topic: "Slayer exciter" variations  (Read 784 times)

Offline acmq

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"Slayer exciter" variations
« on: July 17, 2020, 02:47:17 AM »
The Slayer exciter circuit admits several variations. Two are shown below, where the LED is replaced by another primary circuit, more than doubling the output power at the cost of almost no extra stress in the transistors. L1 and L3 are assembled as a bifilar coil. Two power supplies are needed, but it's also possible to split in two a single supply with adequate circuitry.

The normal circuit modified:


Alternative version modified:


The second circuit, with TIP41/TIP42 transistors at 15 V, showing "one-wire energy transfer". This version appears to work slightly better than the first, with less heating.

Offline T3sl4co1l

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Re: "Slayer exciter" variations
« Reply #1 on: July 17, 2020, 06:04:02 PM »
Yup, that'll do. :) The bifilar winding should be the kicker here.  Reactive energy in the primary can be recirculated, rather than wasted at turn-off.

Tim

Offline acmq

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Re: "Slayer exciter" variations
« Reply #2 on: July 21, 2020, 08:12:09 PM »
There is no significant recycling, because the transistors conduct without overlap,  but more energy is transferred to the output. Less heating may be obtained because the maximum vce of the transistors is clamped, but delays in the switching may cause extra power loss.

Offline T3sl4co1l

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Re: "Slayer exciter" variations
« Reply #3 on: July 22, 2020, 05:53:32 AM »
Oh actually it's even worse than that; one side dropping below saturation causes B-C forward bias, which causes E-B forward bias on the opposite side (say the PNP turns off suddenly, so the NPN collector sees flyback below GND; or the opposite of all this for the NPN turning off).  Which opposes the flyback voltage; effectively, the one transistor acts as a diode into the other and feedback becomes negative, enforcing saturation anyway (heh, well, unless the bifilar winding is resonant within the transistor's bandwidth, in which case it probably squegs).  But it's not the low dissipation saturation of the NPN clamping to ground, it's wasting double the supply through the PNP to do it.  Same situation when an audio amplifier is handling reactive current: the energy returned to the amplifier is burnt doubly in its linear output stage.

But the simple inclusion of clamp diodes (or using BJTs with E-C diodes built in) addresses all this!

Tim

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Re: "Slayer exciter" variations
« Reply #4 on: July 23, 2020, 03:01:27 AM »
What I see from simulations is that, in the first circuit, whern the NPN transistor cuts off the transformer L1-L3 forces the voltage at the top of L3 up, making the BC junction of the PNP transistor and the BE junction of the NPN transistor conduct and clamp the voltage. The same occurs with opposite polarities when the PNP transistor cuts off. In both cases the collector current is suddenly interrupted, wasting some power. Something similar happens in the second version. Really, EC diodes in both transistor appear to reduce the power wasted. I will try soon.

Offline T3sl4co1l

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Re: "Slayer exciter" variations
« Reply #5 on: July 23, 2020, 05:31:43 AM »
Should be the same result as the diode-clamped bifilar single transistor circuit, with the difference that, because of the natural clamping behavior of this circuit, you can't get any additional flyback voltage regardless.  So the clamp diodes should have power savings with basically no downside.

Tim

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Re: "Slayer exciter" variations
« Reply #5 on: July 23, 2020, 05:31:43 AM »

 


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