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### Author Topic: bedini, the daftman SS charger & MHOP  (Read 23794 times)

#### MarkE

• Hero Member
• Posts: 6830
##### Re: bedini, the daftman SS charger & MHOP
« Reply #30 on: November 11, 2014, 03:56:38 AM »
Yes and if you played the animation you see it in action.  The screen cap is attached.

There is one mistake on that page that you repeated.  It's really the "L/R" time constant and not the "LR" time constant.  You don't want to confuse it with the RC time constant.  The first is division, the second multiplication.  Since the L/R time constant and the RC time constant have the same exponential waveform, you see it everywhere on scope traces.  If you randomly watched 10 clips that have a lot of scope shots done by typical experimenters around here, chances are you will observe the exponential waveform in at leas a few, if not most, of the clips.

The time constant can be a microsecond, a millisecond, a second, or a day in length, but they still have the same waveform.
Most chopping circuits try to operate at a frequency much greater than the inverse of the L/R time constant.  The idea is to dissipate as little energy as possible in the resistance.

#### qtrhack

• Newbie
• Posts: 21
##### Re: bedini, the daftman SS charger & MHOP
« Reply #31 on: November 11, 2014, 04:32:35 AM »
Most chopping circuits try to operate at a frequency much greater than the inverse of the L/R time constant.  The idea is to dissipate as little energy as possible in the resistance.

i am sure i will understand this better as i learn more ... but ... do you care to explain to a neophyte??

#### qtrhack

• Newbie
• Posts: 21
##### Re: bedini, the daftman SS charger & MHOP
« Reply #32 on: November 11, 2014, 04:40:03 AM »
The time constant can be a microsecond, a millisecond, a second, or a day in length, but they still have the same waveform.

am i correct that 1 time constant is equal to (roughly) inverse phi?  is this the case for all time constants??

#### MileHigh

• Hero Member
• Posts: 7600
##### Re: bedini, the daftman SS charger & MHOP
« Reply #33 on: November 11, 2014, 05:44:08 AM »
Quote
do you care to explain to a neophyte??

Look at the circuit in the demo.  You know the battery is supplying power, and how much power it's supplying is a function of time.  Look at where the power is going and compare what's happening at the beginning of the waveform to the end of waveform.

Quote
am i correct that 1 time constant is equal to (roughly) inverse phi?

No, the time constant tells you how long it takes for a circuit to react when you throw the switch.

• Jr. Member
• Posts: 71
##### Re: bedini, the daftman SS charger & MHOP
« Reply #34 on: November 11, 2014, 06:04:18 AM »
Just out of curiosity,  what are you trying to achieve with this project ??

Bare in mind that BEMF (or spikes) are only 50% of the energy you spent to energize to coil and that's with a fast diode and a good switch.

#### qtrhack

• Newbie
• Posts: 21
##### Re: bedini, the daftman SS charger & MHOP
« Reply #35 on: November 11, 2014, 06:22:03 AM »
Just out of curiosity,  what are you trying to achieve with this project ??

is that question for me?  if so, then i can't say anything more than a learning experience right now.  i don't know enough to know what i don't know - you know?