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  #11  
Old 1 Week Ago
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aswracing aswracing is offline
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Originally Posted by bustert View Post
in normal mode of operation, the stock regulator does not shut anything to ground. there is a protection circuit that will bleed off excess current but in normal mode of running, the system load usually keeps things in check, this over load is usually triggered by high rpm and the battery is charged and the system cannot dissipate the current, the machine runs off the regulator and battery only provides short fall.
the newer switched mode regulators are more effiecent and produce less heat.the reason why tv's lost weight.
The stock regulator is a shunt style. All power produced by the stator in excess of what's needed to charge the battery and meet other electrical demands (ignition, lights, etc) is shunted, rather than blocked. The stator is always putting out everything it can.

It's very similar to how oil bypass style oil pressure regulators work. The pump always pumps everything it can, and pressure (voltage) is regulated by throwing away the excess via a bypass.

The CE and some other aftermarket regulators are resistive instead. Power from the stator in excess of demand isn't shunted, it's blocked. This reduces the load on the stator. Some of these companies even claim a horsepower gain. But if you do the math on it, it's tiny. One horsepower is 746 watts. At 12 volts, 746 watts works out to 62 amps. That's far more than our alternators are capable of putting out. So the max power gain, even if there was no load on the alternator, is something much less than 1 horsepower.

A switching regulator works by varying the duty cycle of the voltage before any filtering or regulation, and sometimes before even rectifying it. Since it's effectively flipping a switch many times a second, there's no resistive load, and therefore essentially no power is lost to heat.
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  #12  
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this subject is up on the forum already
this assumption is applied to the mechanical regulator as well, but it is not what it seems.
there are several types used over the years be it scr or transistor or triac.
they all operate like a light switch on the wall, does power flow when off,?, naw. the same for the regulators.
if i can find the thread, i'll repost.
there are 3 sections
1. rectification
2. regulation
3. protection
both # 2 & 3 usually have zener control and are clamped.
also of interest is that the ac is bled off, not the dc which reduces amp load.
switch mode is a tad more complicated but the explanation close enough. power is controlled by varying where in the wave form the semi-conductor is turned on so there is a timing circuit and oscillator for turn on/off.
just like scr motor control on drilling rigs.
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  #13  
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bustert bustert is offline
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cannot find it so in pieces
the below is the calculated dissipation of the stator. while there is a shunt, it is not what one would expect, not massive amounts of current and only when the zener clamp value is exceeded.

some interesting things about the hd system. i did not factor in effiency rating and all things are considered maximum values with data take from hd documentation.
1. system max amps = 22
2. @ 2000 rpm volt x amps = 323.4 watts
3. @ 2000 rpm current level @ 13.0vdc = 19>23 amps

we now have maximum watts available dc. using zener value range

1. 323.4/ 38vac = 8.5 amps
2. 323.4/ 52vac = 6.2 amps

these are the amp draw required from the stator. NOTICE as the voltage climbs, the amperage goes down, product of OHM's law.

electrical loading

1. headlight = 5.0 amps
2. position = .32
3. tail = .59
4. stop = 2.25
5. running/signal = 2.25 front and 2.25 rear = 4.5 amp
6 ignition = 3.0 > 5.0 amps

total draw = 17.6 amps (times 14.7vdc = 258.72 watts) (using max zener cut off)

take 258.7 from available = 64.7 watts reserve

1. 64.7 watts/ 44vac = 1.47 amps
2. 64.7 watts/ 50vac = 1.29 amps

this would be the zener cut in amps ac to be shunted, notice as vac goes up, the amperage goes down, once again a product of OHM's law.

also, one has to consider: what is the average value of an ac sine wave??? of coarse that would be ZERO volts and with out volts, can there be amps? that is why one has to use the RMS values to calculate dc equivalent. point being, there isn't a massive amount of current being shunted to ground. by the way, the hd regulator is a series unit WITH shunt over voltage control. the only way to tell if the circuit is active is by monitoring ac wave while going down the road at speed and recording ac wave value and knowing zener cut in value. as long as the value is below it, the system is taking care of the load by keeping voltage in check.
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Quote:
Originally Posted by bustert View Post
in normal mode of operation, the stock regulator does not shut anything to ground. there is a protection circuit that will bleed off excess current but in normal mode of running, the system load usually keeps things in check, this over load is usually triggered by high rpm and the battery is charged and the system cannot dissipate the current, the machine runs off the regulator and battery only provides short fall.
the newer switched mode regulators are more effiecent and produce less heat.the reason why tv's lost weight.
Installed C.E. unit over chargeing issue is gone ..Thankyou very much.
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