Alt-BEAM Archive
Message #04347
To: beam@sgiblab.sgi.com
From: Evaristo Westplate evaristo@qctechnology.nl
Date: Tue, 08 Jun 1999 11:39:40 +0200
Subject: [alt-beam] Re: Bicore wasting energy; Power-smart head
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Hi,
I looked at your schematic and I'm wandering about the low-pass filter. In
theory it will take R3*C3 to charge the capacitor up to 60% of its complete
charge which is about the trigger level of the HC240 (@5V Vih=3.15 volts).
If the duty-cycle time of 50% is equal to the RC time then you can detect
the difference between more or less then 50%. This will only work if the
50% duty-cycle time is equal to the RC time. But unfortunate the cycle time
isn't constant but rather dynamic. I'm afraid that your schematic will only
work under certain light conditions.
Next. Suppose that the pulses coming from U1 are to short to charge C3. The
output of U3 will remain high. As a result, U4 will be active all the time.
The PWM output will show the inverted signal from U2. Now the pulses from
U1 are becoming longer and C3 can be charged enough to trigger U3. U4 will
be deactivated and PWM shows the signal from U2. When U1 is active, U2 is
non-active (output low). PWM will be low. When U1 becomes inactive (low
output) then the output of U3 will become high shortly after C3 has
discharged itself enough. As a result U4 becomes active and PWM shows the
inverted output of U2. Result: once the pulses coming from U1 pass through
the low-pass filter, PWM will remain low permanent not effected by U2.
Now this could be handy because no PWM can function as a turn/stop output.
You won't need the op-amp anymore. Unfortunate we still have the first
problem. Still more brainstorming needed.
Alternative comparator (not tested yet):
Look at the attached picture. This circuit can work as a voltage comparator
using the trigger levels of the inverters. The "out" output will only be
high when the input voltage floats around the trigger levels of the
inverters. This schematics works due to the fact that no inverter input has
the same threshold level. The output will probably oscillate a bit once the
input voltage reaches the trigger point because the input voltage to the
inverters are floating around the trigger points.
>Have to have a better look at Wilf's 'power smart head' because I have the
>feeling that his circuit makes use of some concepts which could be used to
>improve my circuit.
Wilf has the photo diodes in series making a voltage divider. Comparing a
voltage is easier then comparing the duty cycle of a dynamic pulse
generator. Yeah a bicore is a simple but yet tough circuit.
That's all for now. See'ya
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Evaristo
Gizmo homepage: http://www.crosswinds.net/~evaristo
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--=====================_7410367==_--
4348 Tue, 8 Jun 1999 03:41:09 -0700 (PDT) [alt-beam] Re: BEAM Swap Shop??? beam@sgiblab.sgi.com Evan Dudzik
> Where? URL??
http://members.xoom.com/Star_BEAM
sorry i forgot to add it in!
> Buzz
>
> > i have a swap shop, but nobody has added anything
> yet. be the first!
> >
> _________________________________________________________
> > Do You Yahoo!?
> > Get your free @yahoo.com address at
> http://mail.yahoo.com
> >
>
>
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