Discharge Negative Capacitor On The Positive Side?

Thread Starter

russwr

Joined Aug 29, 2017
123
Help wanted designing automatic circuit possibly with a separate switch, using directing diodes, blocking diodes, as zener or regular, for discharging negative charged capacitor OR Inductor coil, to resistor load with positive volts? Current passes through minimum initial 12v zener to charge coil/capacitor negative to positive ground. Other circuit is in positive sense to negative ground, and waiting for the extra volts charge.

There is a U.S.Patent for discharging left over energy on capacitor from small power supply to improve engine combustion. (that only uses CDI unit) The 300v discharges down, leaving 50v on cap. That left over energy is carried through diode to spark plug cable. That was called "front end" capacitor circuit. "Back end" circuit used PF capacitor across the spark plug.

My question has to do with wasted energy only, not from Power supply. Induced waste magnet energy generates 130 negative volts on the terminal, that must be converted to positive volts. There used to be a small circuit board advertised about changing polarity.
The problem I am trying to solve is to utilize existing minus 130 volts from magnet induced voltage into it's wire coil inductor to positive ground, and to change THAT, into positive volts for a second circuit. Discharge is a voltage pulse, not AC. Bridge rectifier is for use with AC only.
Maybe there should be a small capacitor, directing diodes, zener or another millihenry inductor to get coil back EMF that is positive? A small boost voltage converter utilizes reverse charging of capacitor, but that is an added on power supply. I already have -130volts.

The old style millihenry Primary ignition coils had associated distributor contacts gap with parallel condenser capacitor rated for 600v. The input was only 12v DC, and Resonance of C + L increased the back EMF out to 250 volts .

(2) 9v batteries can make a plus + minus power supply with common terminal . I can still use 1/2 the negative voltage, if divided up and positive.
There is no schematic diagram ,- asking for circuit options?
 
Last edited:

crutschow

Joined Mar 14, 2008
38,316
Have little idea what you have from your rambling post.
Post a neat and complete schematic of what you have or are proposing.
 

BobTPH

Joined Jun 5, 2013
11,463
It sound like you are trying to recover left over energy from the capacitor in a capacitive discharge ignition system. You say that there is 50V left on the capacitor after it is used to generate the spark, and you want to recover that energy.

Well, that energy is not lost. In the next cycle, the capacitor starts charging from 50V, instead of 0, so that energy is used.
 

Thread Starter

russwr

Joined Aug 29, 2017
123
It sound like you are trying to recover left over energy from the capacitor in a capacitive discharge ignition system. You say that there is 50V left on the capacitor after it is used to generate the spark, and you want to recover that energy.

Well, that energy is not lost. In the next cycle, the capacitor starts charging from 50V, instead of 0, so that energy is used.
I am not using a CDI unit. Not reusing cap from CDI unit. The Patent reference was only about that. Maybe an inductor coil in series charging negative, will discharge as positive Back EMF for a final output if rated properly. Please reread the question. I have no schematic to show, - asking electronics question.
 

BobTPH

Joined Jun 5, 2013
11,463
I read the message three times. It is not at all clear what you are trying to do. All you have given is is some disconnected thoughts.

Please try again to explain what you are trying to do. Start with what problem you are trying to solve.
 

Thread Starter

russwr

Joined Aug 29, 2017
123
I read the message three times. It is not at all clear what you are trying to do. All you have given is is some disconnected thoughts.

Please try again to explain what you are trying to do. Start with what problem you are trying to solve.
The problem I am trying to solve is to utilize existing minus 130 volts from magnet induced voltage into it's wire coil inductor to positive ground, and to change THAT, into positive volts for a second circuit. Maybe there should be a small capacitor, directing diodes, zener or another inductor to get back EMF that is positive? A small boost voltage converter utilizes reverse charging of capacitor, but that is an added on power supply. I already have -130volts.
 
Last edited:

schmitt trigger

Joined Jul 12, 2010
2,027
Bridge rectifier? Just saying.
But don’t become upset if my answer doesn’t satisfy you.
I have also read and re-read your original post and I also find it confusing what exactly you are attempting to achieve.
 

Futurist

Joined Apr 8, 2025
720
You begin by saying you're designing a circuit. Well every circuit ever designed was also drawn, what prevents you from drawing this legibly on paper and taking a photograph? if you cannot yet depict this as a circuit diagram then you're not designing at all.

Furthermore terms like "negative capacitor" are not electronics terms they are pseudo electronic terms, you'll not design much until you start using actual engineering terminology.
 
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