Comments for Teravolt.org http://www.teravolt.org High voltage, research and stuff Fri, 17 Feb 2012 13:45:15 +0000 hourly 1 http://wordpress.org/?v=3.3.1 Comment on ZVS Driver by grenadier http://www.teravolt.org/zvs-driver/#comment-182 grenadier Fri, 17 Feb 2012 13:45:15 +0000 http://teravolt.org/?page_id=58#comment-182 Unfortunately no. You can't PWM a resonant circuit. Unfortunately no. You can’t PWM a resonant circuit.

]]> Comment on ZVS Driver by Andrew http://www.teravolt.org/zvs-driver/#comment-180 Andrew Fri, 17 Feb 2012 12:37:58 +0000 http://teravolt.org/?page_id=58#comment-180 Hi is it possible to build a PWM to change frequency on this ZVS driver? Any schematics please? Thanks Hi is it possible to build a PWM to change frequency on this ZVS driver? Any schematics please?
Thanks

]]> Comment on DIY Capacitors by grenadier http://www.teravolt.org/diy-capacitors/#comment-170 grenadier Wed, 15 Feb 2012 03:24:42 +0000 http://teravolt.org/?page_id=98#comment-170 That would actually make for a much better capacitor since there'd be much, much less inductance. That would actually make for a much better capacitor since there’d be much, much less inductance.

]]> Comment on ZVS Driver by grenadier http://www.teravolt.org/zvs-driver/#comment-166 grenadier Tue, 14 Feb 2012 04:23:17 +0000 http://teravolt.org/?page_id=58#comment-166 About 75kHz About 75kHz

]]> Comment on ZVS Driver by grenadier http://www.teravolt.org/zvs-driver/#comment-165 grenadier Tue, 14 Feb 2012 04:13:11 +0000 http://teravolt.org/?page_id=58#comment-165 I've tried that before, unfortunately it didn't work :-/ I’ve tried that before, unfortunately it didn’t work :-/

]]> Comment on ZVS Driver by some one http://www.teravolt.org/zvs-driver/#comment-164 some one Tue, 14 Feb 2012 02:51:47 +0000 http://teravolt.org/?page_id=58#comment-164 what is the yoscillator’s frequency that one of secondary circuit what is the yoscillator’s frequency that one of secondary circuit

]]> Comment on ZVS Driver by some one http://www.teravolt.org/zvs-driver/#comment-163 some one Tue, 14 Feb 2012 02:36:34 +0000 http://teravolt.org/?page_id=58#comment-163 what is the yoscillator's frequency that one of second circuit what is the yoscillator’s frequency that one of second circuit

]]> Comment on ZVS Driver by Craig http://www.teravolt.org/zvs-driver/#comment-145 Craig Fri, 10 Feb 2012 05:09:32 +0000 http://teravolt.org/?page_id=58#comment-145 It might help to make the inductor at least 4 times larger than the primary inductance of the transformer and use a freewheeling diode. Connect the diode's cathode to the V+ side of the inductor and connect the diode's anode to ground. The diode should be rated to carry the input current. A large bypass capacitor in parallel with the diode is a good idea too. It might help to make the inductor at least 4 times larger than the primary inductance of the transformer and use a freewheeling diode. Connect the diode’s cathode to the V+ side of the inductor and connect the diode’s anode to ground. The diode should be rated to carry the input current. A large bypass capacitor in parallel with the diode is a good idea too.

]]> Comment on ZVS Driver by Craig http://www.teravolt.org/zvs-driver/#comment-144 Craig Fri, 10 Feb 2012 04:47:51 +0000 http://teravolt.org/?page_id=58#comment-144 You might fix this Mazzelli converter by adding two small signal transistors and three resistors to each mosfet's drive circuit. Connect an npn transistor with its collector to the gate of the mosfet and its emitter to the source. Then connect a pnp transistor with it's emitter to the gate of the mosfet and its collector connected to the base of the npn though a resistor. Connect a resistor from the gate of the mosfet to the base of the pnp and another resistor from the base of the pnp to the anode of the diode. What happens... the cathode of the diode goes low and it pulls the base of the pnp down causing it to conduct which turns the npn on clamping the mosfet gate to source. The problem is the combined forward drop of the diode plus the voltage drop across the mosfet's Rdson on isn't low enough to reliably keep opposite mosfet off. The npn transistor clamps the mosfet off effectively. Also connect the two 470 Ohm resistors to a regulated voltage. The zener current climbing as V+ is cranked up isn't helping. You might fix this Mazzelli converter by adding two small signal transistors and three resistors to each mosfet’s drive circuit.

Connect an npn transistor with its collector to the gate of the mosfet and its emitter to the source. Then connect a pnp transistor with it’s emitter to the gate of the mosfet and its collector connected to the base of the npn though a resistor. Connect a resistor from the gate of the mosfet to the base of the pnp and another resistor from the base of the pnp to the anode of the diode.

What happens… the cathode of the diode goes low and it pulls the base of the pnp down causing it to conduct which turns the npn on clamping the mosfet gate to source.

The problem is the combined forward drop of the diode plus the voltage drop across the mosfet’s Rdson on isn’t low enough to reliably keep opposite mosfet off. The npn transistor clamps the mosfet off effectively.

Also connect the two 470 Ohm resistors to a regulated voltage. The zener current climbing as V+ is cranked up isn’t helping.

]]> Comment on ZVS Driver by Warren Smith http://www.teravolt.org/zvs-driver/#comment-98 Warren Smith Wed, 01 Feb 2012 10:23:41 +0000 http://teravolt.org/?page_id=58#comment-98 Have you measured what frequency this was oscillating? Thanks Warren Have you measured what frequency this was oscillating?
Thanks
Warren

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