Guest
i was unable to understand what these harmonics are?
plz help me regarding this
plz help me regarding this
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E
Eeyore
Guest
dileepkumarladi@gmail.com wrote:
that's equivalent to a resistive load, the current flow is
non-sinusoidal.
Non-sinusoidal waveforms may be considered as a series of harmonics of
the fundamental frequency (see Fourier).
That's where these harmonics come from.
Graham
When an electrical circuit does not draw a current from the supplyi was unable to understand what these harmonics are?
that's equivalent to a resistive load, the current flow is
non-sinusoidal.
Non-sinusoidal waveforms may be considered as a series of harmonics of
the fundamental frequency (see Fourier).
That's where these harmonics come from.
Graham
I
Ian Macmillan
Guest
"Eeyore" <rabbitsfriendsandrelations@hotmail.com> wrote in message
news:47EB84F4.D6EE485A@hotmail.com...
As any waveform can be synthesised by adding harmonics of various amplitudes
and phases, it follows that anything that causes a waveform to depart from a
perfect sinewave will create harmonics, that is multiples of the fundamental
frequency - 50 or 60 Hz.
A common example is the rectifier with a capacitive input filter, which
draws a pulse from the supply at each voltage peak. If you put a scope on
the mains you can see the blip caused by thousands of TV sets and computers
all charging their filter capacitors together.
All the best
Ian Macmillan
news:47EB84F4.D6EE485A@hotmail.com...
harmonics.dileepkumarladi@gmail.com wrote:
i was unable to understand what these harmonics are?
When an electrical circuit does not draw a current from the supply
that's equivalent to a resistive load, the current flow is
non-sinusoidal.
Non-sinusoidal waveforms may be considered as a series of harmonics of
the fundamental frequency (see Fourier).
That's where these harmonics come from.
Graham
Non-resistive loads such as capacitors by themselves do not create
As any waveform can be synthesised by adding harmonics of various amplitudes
and phases, it follows that anything that causes a waveform to depart from a
perfect sinewave will create harmonics, that is multiples of the fundamental
frequency - 50 or 60 Hz.
A common example is the rectifier with a capacitive input filter, which
draws a pulse from the supply at each voltage peak. If you put a scope on
the mains you can see the blip caused by thousands of TV sets and computers
all charging their filter capacitors together.
All the best
Ian Macmillan
J
John Fields
Guest
On Thu, 27 Mar 2008 11:28:52 +0000, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:
That's not true, since if the load is linear, but reactive, and the
voltage across it is sinusoidal, the current waveform through the load
will also be sinusoidal. Voltage and current will be out of phase
with each other, but no harmonics will be generated.
---
But, if the load is linear, the current and voltage waveforms will be
sinusoidal.
---
Yup.
<rabbitsfriendsandrelations@hotmail.com> wrote:
---dileepkumarladi@gmail.com wrote:
i was unable to understand what these harmonics are?
When an electrical circuit does not draw a current from the supply
that's equivalent to a resistive load, the current flow is
non-sinusoidal.
That's not true, since if the load is linear, but reactive, and the
voltage across it is sinusoidal, the current waveform through the load
will also be sinusoidal. Voltage and current will be out of phase
with each other, but no harmonics will be generated.
---
---Non-sinusoidal waveforms may be considered as a series of harmonics of
the fundamental frequency (see Fourier).
But, if the load is linear, the current and voltage waveforms will be
sinusoidal.
---
---That's where these harmonics come from.
Yup.
Guest
On Mar 27, 6:08 am, John Fields <jfie...@austininstruments.com> wrote:
Same story with subharmonics?
Michael
On Thu, 27 Mar 2008 11:28:52 +0000, Eeyore
rabbitsfriendsandrelati...@hotmail.com> wrote:
dileepkumarl...@gmail.com wrote:
i was unable to understand what these harmonics are?
When an electrical circuit does not draw a current from the supply
that's equivalent to a resistive load, the current flow is
non-sinusoidal.
---
That's not true, since if the load is linear, but reactive, and the
voltage across it is sinusoidal, the current waveform through the load
will also be sinusoidal. Voltage and current will be out of phase
with each other, but no harmonics will be generated.
---
Non-sinusoidal waveforms may be considered as a series of harmonics of
the fundamental frequency (see Fourier).
---
But, if the load is linear, the current and voltage waveforms will be
sinusoidal.
---
That's where these harmonics come from.
---
Yup.
Same story with subharmonics?
Michael
E
Eeyore
Guest
mrdarrett@gmail.com wrote:
Graham
I'm not familiar with any in this context.John Fields <jfie...@austininstruments.com> wrote:
Eeyore wrote:
dileepkumarl...@gmail.com wrote:
i was unable to understand what these harmonics are?
When an electrical circuit does not draw a current from the supply
that's equivalent to a resistive load, the current flow is
non-sinusoidal.
---
That's not true, since if the load is linear, but reactive, and the
voltage across it is sinusoidal, the current waveform through the load
will also be sinusoidal. Voltage and current will be out of phase
with each other, but no harmonics will be generated.
---
Non-sinusoidal waveforms may be considered as a series of harmonics of
the fundamental frequency (see Fourier).
---
But, if the load is linear, the current and voltage waveforms will be
sinusoidal.
---
That's where these harmonics come from.
---
Yup.
Same story with subharmonics?
Graham
Guest
On Mar 27, 5:30 pm, Eeyore <rabbitsfriendsandrelati...@hotmail.com>
wrote:
So if I've got a 50 kHz switcher, I don't have to worry about anything
at 25 kHz, or 12.5 kHz?
MD
wrote:
mrdarr...@gmail.com wrote:
John Fields <jfie...@austininstruments.com> wrote:
Eeyore wrote:
dileepkumarl...@gmail.com wrote:
i was unable to understand what these harmonics are?
When an electrical circuit does not draw a current from the supply
that's equivalent to a resistive load, the current flow is
non-sinusoidal.
---
That's not true, since if the load is linear, but reactive, and the
voltage across it is sinusoidal, the current waveform through the load
will also be sinusoidal. Voltage and current will be out of phase
with each other, but no harmonics will be generated.
---
Non-sinusoidal waveforms may be considered as a series of harmonics of
the fundamental frequency (see Fourier).
---
But, if the load is linear, the current and voltage waveforms will be
sinusoidal.
---
That's where these harmonics come from.
---
Yup.
Same story with subharmonics?
I'm not familiar with any in this context.
Graham
So if I've got a 50 kHz switcher, I don't have to worry about anything
at 25 kHz, or 12.5 kHz?
MD
W
whit3rd
Guest
On Mar 28, 8:18 am, mrdarr...@gmail.com wrote:
50 kHz switch, you have a SWITCHING POWER SUPPLY WITH LOAD AND
FEEDBACK. Either modulation of the load, or modulation in
the feedback control, can cause subharmonics.
Most good switching supplies will not generate subharmonics
in the absence of load requirement, but that's because the
switching frequency was chosen to be easy to filter (and lower
frequencies aren't as easy). If your load can be modulated
by an applied signal, the switching supply will cheerfully sing the
aria from Rigoletto...
Worry is definitely called for, because instead of a simpleSo if I've got a 50 kHz switcher, I don't have to worry about anything
at 25 kHz, or 12.5 kHz?
50 kHz switch, you have a SWITCHING POWER SUPPLY WITH LOAD AND
FEEDBACK. Either modulation of the load, or modulation in
the feedback control, can cause subharmonics.
Most good switching supplies will not generate subharmonics
in the absence of load requirement, but that's because the
switching frequency was chosen to be easy to filter (and lower
frequencies aren't as easy). If your load can be modulated
by an applied signal, the switching supply will cheerfully sing the
aria from Rigoletto...