Are Tommey Reed´s pulse motor circuits overunity ?

[gyulasun]

@tommyreed

This graphic I composed is what I understand from the information that you provided. I do expect that the members of the forum start replicating your work.

Jesus

Hi Jesus,

I would like to suggest a modification in the schematics you composed.
Now the TC4429 is fed from the 5V voltage stabilizer.  This means that the 4 MOSFETs receive a maximum of 5V driving pulse as the gate-source control voltage,  and this value is near to the threshold voltage (which is anywhere between 2-4V, see data sheet http://www.fairchildsemi.com/ds/RF/RFP40N10.pdf ). While the MOSFETs are surely open for the 5V, no doubt,  their gate-source ON resistance, r_DSonwill surely be higher than what would be achieveable by running the TC4429 from the 12V voltage stabilizer. 
If you see the r_DSon value from the data sheet, it is specified as 0.04 Ohm at 10V gate-source voltage input, V_GS,  normally such power MOSFETs need at least 8-10V gate source control voltage to obtain the specified ON resistance. 
This modification would make the 5V stabilizer redundant, while the power loss on the 4 parallel MOSFETs will be less, hence switching efficiency can increase.
If you agree with this, than the supply pins of the TC4429 (that are tied to the 5V stabilizer)  would connect to the output of the 12V stabilizer, that is all.

rgds,  Gyula

[Tommey Reed]

These diode are needed!, in fact it works great.
I found that if you don't have them, you will blow the mosfets.
I had to replace many before adding those.
Also, forgot to add the capacitor onthe input battery.
I fixed the schematic on the web page: OverUnityNow.com.
One other thing, the flyback effect you talked about did not use mosfet technology or low ohms coils.

Tom....

[Tommey Reed]

You can use a 7812 to power both, but caution is needed.
I have used 7812 on both circut, but when using different mosfet, the 4429 works good at 5v.
So its a basic driver for most mosfets.....
Tom

[Tommey Reed]

Electrical Specifications TC = 25oC, Unless Otherwise Specified
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
Drain to Source Breakdown Voltage BVDSS ID = 250mA, VGS = 0V (Figure 9) 100 - - V
Gate Threshold Voltage VGS(TH) VGS = VDS, ID = 250mA (Figure 2 - 4 V
Zero Gate Voltage Drain Current IDSS VDS = 80V,
VGS = 0V
TC = 25oC - - 1 mA
TC = 150oC - - 50 mA
Gate to Source Leakage Current IGSS VGS = ±20V - - ±100 nA
Drain to Source On Resistance rDS(ON) ID = 40A, VGS = 10V (Figure 7) - - 0.040 W
Turn-On Time tON VDD = 50V, ID = 20A,
RL = 2.5W, VGS = 10V, RGS = 4.2 W
(Figure 11)
- - 80 ns
Turn-On Delay Time td(ON) - 17 - ns
Rise Time tr - 30 - ns
Turn-Off Delay Time td(OFF) - 42 - ns
Fall Time tf - 20 - ns
Turn-Off Time tOFF - - 100 ns
Total Gate Charge Qg(TOT) VGS = 0V to 20V VDD = 80V,
ID = 40A,
RL = 2.0W
(Figures 11)
- - 300 nC
Gate Charge at 10V Qg(10) VGS = 0V to 10V - - 150 nC
Threshold Gate Charge Qg(TH) VGS = 0V to 2V - - 7.5 nC
Thermal Resistance Junction to Case RqJC - - 0.94 oC/W
Thermal Resistance Junction to Ambient RqJA TO-247 - - 30 oC/W
TO-220AB and TO-263AB - - 62 oC/W
Source to Drain Diode Specifications
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
Source to Drain Diode Voltage VSD ISD = 40A - - 1.5 V
Reverse Recovery Time trr ISD = 40A, dISD/dt = 100A/ms - - 200 ns

[gyulasun]

You can use a 7812 to power both, but caution is needed.
I have used 7812 on both circut, but when using different mosfet, the 4429 works good at 5v.
So its a basic driver for most mosfets.....
Tom

Hi Tom,

Yes, ok.  Maybe the current peaks exceed the 1 Amper limit of the 7812 when the 4429 has to charge up the 8-10nF gate-source capacitance of the combined MOSFETs and in case of a 7805 this limit is not exceeded?
I think this question should be examined and use a heftier 12V stabilizer.

rgds,  Gyula