free
Active Member
 Offline
Posts: 115
Thank You
-Given: 71
-Receive: 13
|
 |
« on: December 04, 2007, 01:40:21 01:40 » |
|
I want to convert variable AC square wave voltage to DC.
The max square wave voltage is 24Vpp.
Can you give me some advices, the link, the good way to convert it?
Thanks
|
|
|
|
« Last Edit: December 04, 2007, 01:44:00 01:44 by free »
|
Logged
|
Some dream to escape reality, some to change it forever.
- Soichiro Honda -
|
|
|
user112
Junior Member
Offline
Posts: 85
Thank You
-Given: 6
-Receive: 139
Salut tuturor(hello to all)
|
|
« Reply #1 on: December 04, 2007, 05:21:33 05:21 » |
|
what is the frequency? if is under 100-200Hz you can use normal rectifier bridge if is bigger you must use switching diode like those from switching power supply
|
|
|
|
|
Logged
|
|
|
|
free
Active Member
Offline
Posts: 115
Thank You
-Given: 71
-Receive: 13
|
|
« Reply #2 on: December 04, 2007, 09:10:14 21:10 » |
|
The frequency is 75Hz.
If I use normal rectifier bridge, what about with breakdown voltage of diode.
The square wave sometime produces 1 volt or less.
Does the AC to DC converter with opamp work fine for square wave input?
|
|
|
|
« Last Edit: December 04, 2007, 09:28:37 21:28 by free »
|
Logged
|
Some dream to escape reality, some to change it forever.
- Soichiro Honda -
|
|
|
|
aniltandon007
Guest
|
|
« Reply #3 on: December 05, 2007, 06:46:18 06:46 » |
|
how to use smps ic tl494 to generate pwm for motor driver
|
|
|
|
|
Logged
|
|
|
|
user112
Junior Member
Offline
Posts: 85
Thank You
-Given: 6
-Receive: 139
Salut tuturor(hello to all)
|
|
« Reply #4 on: December 05, 2007, 06:37:27 18:37 » |
|
if you have need of accuracy you must use precision rectifier circuits made with operational amplifiers this d'ont have breakdown voltage see this link http://sound.westhost.com/appnotes/an001.htm |
|
|
|
|
Logged
|
|
|
|
Kabron
Active Member
Offline
Posts: 196
Thank You
-Given: 63
-Receive: 139
|
|
« Reply #5 on: December 06, 2007, 08:13:04 08:13 » |
|
Analog Devices AD736 Low Cost, Low Power,
True RMS-to-DC Converter free samples.
|
|
|
|
|
Logged
|
|
|
|
belinao
Newbie
Offline
Posts: 16
Thank You
-Given: 1
-Receive: 12
|
|
« Reply #6 on: December 09, 2007, 07:19:42 07:19 » |
|
precision rectifiers with op amps might be the answer... what is the output current that u need?
|
|
|
|
|
Logged
|
|
|
|
neelandan
Newbie
Offline
Posts: 15
Thank You
-Given: 6
-Receive: 3
|
|
« Reply #7 on: December 10, 2007, 11:14:11 11:14 » |
|
Depends ...
If you need to transfer power, you need diode bridge
If you need to measure the amplitude, you need precision rectifier circuits with opamps.
|
|
|
|
|
Logged
|
Deep inside the carcass of a dead (short) circuit.
|
|
|
free
Active Member
Offline
Posts: 115
Thank You
-Given: 71
-Receive: 13
|
|
« Reply #8 on: December 10, 2007, 02:06:21 14:06 » |
|
Thanks for your suggestions.
I will build rectifier with single supply opamps.
what type of opamp is ideal for it (precision) ?
|
|
|
|
|
Logged
|
Some dream to escape reality, some to change it forever.
- Soichiro Honda -
|
|
|
|
