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How can you convert 12 Volt DC into 150 Volt DC?

  • I just bought a power inverter, which converts a 12 Volt DC input (car battery) to 120 Volt AC. One of the steps to do this was to first convert the 12 Volt DC to something like 150 Volt DC- it may have been slightly less, but that was the gist of the number. Now I know the basic equation V = IR, so is it as simple as increasing the resistance? And at the expense of what, the current? Or just more dissipated energy in the form of heat transfer? In other words, how is this done? I have an engineering (not electrical though) background, so I can understand and would prefer a technical explanation. Any additional related information would be greatly appreciated as well. Thanks

  • Answer:

    No. You need a step up transformer. The step up tranformer works by having two coils one inside the other. you pass a current through the outside coil and it induces a current in the inside one. The voltage depends on the difference in the number of loops in the coils. It can be worked out using the Neumann formula for coupled inductance.

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Simply increasing the resistance of the circuit will not result in increased output voltage. The only way to increase DC output voltage from lower source voltage, is to "chop it"(switch it off and on) and pass the resulting pulses or oscillations through a transformer, then through rectification, and then voltage control it. If you are wanting to increase the output voltage of you inverter, you could change the balancing resistors in the voltage regulation portion of the inverter.

Dusty B

On the output of the 12vdc-150cac inverter, connect a full-wave bridge rectifier. You can use diodes or transformers for this type of rectifier. That will provide you with a single polarity, sinusodial output with ripples. Then add a large value capacitor across the output (or load connections) to smooth out the ripples between the peaks of the sine waves. This will give you nearly a smooth dc voltage output. If the dc voltage output is lower than you expected and you used transformers for the rectification, ensure the secondary turns are higher in number than the primary turns. This will act as as a step-up transformer as well as rectifying the a.c. and make up for any voltage losses. Click on the source link I posted below for some illustrations and formulas.

Horatio

The 12Vdc powers an oscillator. The oscillator drives a step-up transformer, the output of which is rectified and smoothed. That's all.

dmb06851

A fairly good, not-TOO-technical explanation is found at the reference.

jgoulden

" I don't even really care how the inverter itself works, I'm just asking how it is possible to convert 12 Volt DC to 150 Volt DC" A contradiction! Can't explain it without explaining how an inverter works. Try to state what you want in clear terms, without contradictions. And you are wrong in your first paragraph. An inverter converts 12 volts DC directly to 24 volts P-P Ac, which is applied to a transformer to step it up to 120 volts AC. If you want 150 volts DC, then the 120 volts AC is piped into a bridge rectifier and a capacitor which converts it to the 150 volts AC. .

billrussell42

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