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Three phase sine wave amplitude control

P

PK

Jan 1, 1970
0
Hi all, I want to control the amplitude of 3 phase sine wave via
following option:

1. With help of PGA(programmable gain amplifiers) with good resolution
2.with analog switch & resistor network

I know in both ways it is possible, bt i wanna know in which way it
will be less costly n provide best resolution of gain.(PGA & analog
switches both r costly)

I m generation three phase sine wave by analog Quad DAC...
kindely suggest any new idea to solve this issue..
regards,
pravin
 
D

Deefoo

Jan 1, 1970
0
PK said:
Hi all, I want to control the amplitude of 3 phase sine wave via
following option:

1. With help of PGA(programmable gain amplifiers) with good resolution
2.with analog switch & resistor network

I know in both ways it is possible, bt i wanna know in which way it
will be less costly n provide best resolution of gain.(PGA & analog
switches both r costly)

I m generation three phase sine wave by analog Quad DAC...
kindely suggest any new idea to solve this issue..
regards,
pravin

I have done a similar thing, but I simply implemented the amplitude control
in the processor because I already had a numeric angle control signal. If
you have an external angle control signal maybe you can digitize it and feed
it into your processor (assuming you use some kind of controller).

--DF
 
T

Tim Wescott

Jan 1, 1970
0
PK said:
Hi all, I want to control the amplitude of 3 phase sine wave via
following option:

1. With help of PGA(programmable gain amplifiers) with good resolution
2.with analog switch & resistor network

I know in both ways it is possible, bt i wanna know in which way it
will be less costly n provide best resolution of gain.(PGA & analog
switches both r costly)

I m generation three phase sine wave by analog Quad DAC...
kindely suggest any new idea to solve this issue..
regards,
pravin

As Deefoo pointed out, if you're generating your sine wave by a
processor, why not do the multiply internally?

Multiplying DACs can be quite inexpensive. With a bit of thinking you
can make them two-quadrant devices, and have your 'analog switch &
resistor network' in a package for less than two bucks from Digi-Key.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Posting from Google? See http://cfaj.freeshell.org/google/

"Applied Control Theory for Embedded Systems" came out in April.
See details at http://www.wescottdesign.com/actfes/actfes.html
 
D

Don Lancaster

Jan 1, 1970
0
PK said:
Hi all, I want to control the amplitude of 3 phase sine wave via
following option:

1. With help of PGA(programmable gain amplifiers) with good resolution
2.with analog switch & resistor network

I know in both ways it is possible, bt i wanna know in which way it
will be less costly n provide best resolution of gain.(PGA & analog
switches both r costly)

I m generation three phase sine wave by analog Quad DAC...
kindely suggest any new idea to solve this issue..
regards,
pravin
http://www.tinaja.com/magsn01.asp


--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email: [email protected]

Please visit my GURU's LAIR web site at http://www.tinaja.com
 
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