Ron Brandt battery-switching circuit

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  • Last Post 07 March 2019
Prometheus posted this 04 March 2019

Here's a mock-up of Ron Brandt's dual-battery circuit (he got it from his friend Nikola Tesla) that he put into a small car, reporting that it greatly extended the range of the vehicle. You'll note it looks (and operates) a lot like the Dickson charge pump I detailed in a prior post.

My mock-up is set initially so the bulb (representing the load, whether it be an actual bulb or a motor) is set to take ~1 HP worth of power, but the slider allows it to go up to 270 KW, or approximately what a Tesla automobile would take at full throttle. The total battery voltage delivered to the load is approximately that which a Tesla uses, as well.

I've created a separate circuit beside the first, with the same resistance and load, to show the power draw from the batteries for a direct-connected circuit, versus the battery-switching circuit. The resistance in the second circuit is an approximation of the resistance in the first circuit. Once the light bulbs representing the load level out, you can see that they're both drawing identical power.

The direct-connected circuit draws 192.7 watts from each battery. The battery-switching circuit draws an average of 77.08 watts from each battery. Part of this is due to the fact that the battery-switching circuit has twice the number of batteries than the direct connected circuit, and accounting for this gives 154.16 watts if the battery switching circuit had the same number of batteries as the direct-connected circuit.

This leaves 38.54 watts per cell which is recharging the cells. This means that with double the number of batteries, the battery-switching circuit is sending half the power (38.54/77.08) back to the batteries, without impairing the resultant voltage at the load.

Here's a screenshot of the circuit:

And here's the falstad.com circuit emulator code:

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38 136 0 745.7 270000 Nominal\sPower

 

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Prometheus posted this 06 March 2019

Here's a much-simplified iteration of the Tesla / Brandt / Bedini battery switching circuit. I included a charge pump (a derivation of a voltage doubler) to boost the output voltage, since the circuit has to operate against the diode voltage drop and the reverse voltage of the batteries being charged. The charge pump uses the inertia of the inductors to pull electrons in from ground, allowing more current flow into the load without it coming from the batteries.

Without the charge pump (with just a full-wave rectifier and no inductors), the circuit can only attain ~10.8 volts due to the various voltage drops throughout the circuit. With the charge pump, it maxes out at ~21.25 volts.

You'll note the transformers used as inductors (the charge pump part of the circuit) are much higher inductance than would normally be used for 900 Hz frequency and 50 uF capacitors (for a regular inductor, it'd be 0.62544 mH, whereas the transformers are 20.0144 mH). This is a weird artifact of the transformer's mutual inductance, but the charge pump resonates at 900 Hz. The inductance value was first obtained mathematically, but when I got that value, I couldn't believe it, so I empirically obtained the same value.

A possible application for this, rather than powering a load, would be to recharge a battery (replace the load with a larger battery that then powers a larger load).

According to this PDF file, you don't want to go over ~900 Hz on these types of circuits or the current flow damages components. That's the reason for the 900 Hz frequency.

Here's a screenshot of the circuit in the falstad.com simulator, nearing its peak output voltage:

And here's the falstad.com circuit emulator code:

$ 1 7.500000000000001e-8 3.9121283998153213 27 5 50
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o 38 64 0 28930 0.0001 0.0001 2 2 38 3
38 9 0 48 7457 Nominal\sPower

 

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Prometheus posted this 07 March 2019

Hmmm... seems I've built the charge pump in the last circuit a little too well. Heh.

It slows way down at ~21.25 volts, but then it keeps pumping voltage into the storage capacitor, and it accelerates as the voltage builds!

I ran it until the storage capacitor was up to 5000 volts, here's a screenshot:

Disregard the switch and diodes, I was testing whether I could directly pump the current back into the batteries from the storage capacitor.

And a screenshot of it when it reaches 10,000 volts:

You'll note the power spikes going into the storage capacitor have increased (303.37 W at 5kV, 592.35 W at 10kV), whereas the average power out of the batteries hasn't significantly increased (152.03 mW at 5kV, 158.57 mW at 10kV).

This might be due to the charge pump (center-tapped transformer secondary) acting as bucking coils for part of each cycle.

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Ere many generations pass, our machinery will be driven by a power obtainable at any point of the universe. This idea is not novel. Men have been led to it long ago go by instinct or reason. It has been expressed in many ways, and in many places, in the history of old and new. We find it in the delightful myth of Antheus, who drives power from the earth; we find it among the subtle speculations of one of your splendid mathematicians, and in many hints and statements of thinkers of the present time. Throughout space there is energy. Is this energy static or kinetic? If static, our hopes are in vain; if kinetic - and this we know it is for certain - then it is a mere question of time when men will succeed in attaching their machinery to the very wheelwork of nature.

Experiments With Alternate Currents Of High Potential And High Frequency (February 1892).

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