Boost technology in a regulated mod; who can explain how it works?
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Pulse width modulation is comparable to turning a light on and off. If you switch it on and off faster the room gets brighter. If you slow down, the room gets dimmer.
That's done in pulse modulation by converting straight DC voltage to a pulsed DC voltage. The on/off cycles produce a square wave (think on as the peak and off as the valley).
The farther apart the peaks are, the lower the average voltage applied to the coil (it's on less time with each pulse). To up the wattage you just increase the duration of pulses so that the on-time of the coil increases.
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Uhm, no. The switching speed (frequency) is generally fixed. What changes is the duty cycle (how long the it's ON vs. how long it's OFF).
^This is probably the simplest way to think of it, if you don't work in electricity or electronics.
I've always explained it like neon lights or cell phone chargers. They use a lower voltage in, the transformer increases the voltage but at lower amps (compared to voltage increase). So 110V AC becomes 1000V DC (made up number of course, transformers are different sizes) or like a charger 110V AC to 12V DC.
A square wave pulse oscillator controls the frequency. Change the time base and the pulse rate (duty cycle) can be varied.
It's called pulse width modulation. The width of the pulse is modulated, the time the "peak" lasts.
I think I kind of understand the cycle thing. By reducing the amount of time the power is getting through you could reduce the average level of power coming out at the end of the chain. Power being a non-technical word for what's happening since I don't know whether I'm talking about amps or volts or watts, or something I don't even know the name of. But the original question was about increasing the power.
Like intermittently pinching off a garden hose would reduce the average amount of water coming out the end. Maybe it's more like reducing the size of the nozzle would reduce the total amount of water coming out but increase its speed.
Someone back there was talking about sacrificing amps to get more volts or something along those lines. That may be where the answer is. I never thought about how it worked. And I guess we don't need to know the answer in order to use it, but interesting anyway.
Search for "Faraday - Lenz Law" .
It is the magic you are looking for...
It is the magic you are looking for...
PWM is not boosting. You can't get a higher voltage than the maximum voltage of your battery/pack with PWM.
A boost converter works differently.
A boost converter works differently.
Agreed, I can start a car, I can even drive a car, I can get a car worked upon, I cannot build or repair a car. But I can get by in this computerized age.
But I though the way Earlier VV/VW Boards made wattage above what the Battery Voltage could create was for the Board to first Increase the Input Voltage from the battery to a Fixed amount, say 6.0 Voltage. Then to take this 6.0 Volts and to make "Average" Wattage via PWM.
Or is that not how Earlier VV/VW Boards worked?
Not Disagreeing.
But wouldn't "Smoothness" depend on How Close the Output Voltage is to the Battery Input Voltage? And How Fast the Cycles of On/Off are?
Those boards may have used a boost converter that produced a fixed voltage like 6V, and then used a simple PWM after that to give the user the ability to control the effective voltage after that.
No. A good boost or buck converter is capable of producing whatever DC voltage you want with very minimal AC components.
Frequency is probably what increased as mods become more advanced. Higher frequency synthesization produces smoother waveforms that are closed to actual DC voltage.
Yeah... The more I think about it, if a Board is Increasing the Battery Input Voltage to a Higher Fixed amount, say 6.0 Volts, and then using PWM to give the User what they want average Voltage/Wattage wise, the time the DC would be "Smooth" would Only occur at 6.0 Output Volts.
Some people could post nap inducing three page explanations that include gobbledygook like the tendency of an inductor to resist changes in current by creating and destroying a magnetic field.... But in truth, you're right, it -is- just magic.
Some people could post nap inducing three page explanations that include gobbledygook like the tendency of an inductor to resist changes in current by creating and destroying a magnetic field.... But in truth, you're right, it -is- just magic.
Wikipedia and other web sites do a good job at explaining how it works. Those who are interested can find what they need.
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