LM324: LINE EGULATION

SRINIVASAN E

Part Number: LM324

I am designing a electronic pressure regulator by using the concept of linear voltage regulator. here the pass element is the proportional valve and feedback voltage from the output pressure sensor. set point from the microcontroller as Vref (reference voltage ). i have designed error amplifier for controlling pressure without respect to reference voltage. the output pressure is well regulated. but while changing input pressure the output pressure is changed (i.e like line regulation in voltage regulator ).

i need help to compensate the line regulation to overcome this error.

over 7 years ago

0 Ron Michallick over 7 years ago

TI__Guru**** 151696 points

Srinivasan,

It sounds like the amplifier is regulating the "resistance" of value to a fix level instead of the output pressure.
Is there is load on the output pressure? This means gas flows away from the output of the regulator.
The value can control flow but can't necessarily purge excess pressure.

The feedback should look at output pressure and an external fixed standard.
Then change valve to keep balance of inputs

0 SRINIVASAN E over 7 years ago in reply to Ron Michallick

Prodigy 30 points

thank you ,

the output is the closed loop. it contain champers. the champers pressure is need to regulate as user required level.

I have found the problems in this error amplifier is poor line regulation (like linear regulator line regulation ). can you suggest the how to compensate

line regulation in linear amplifiers.

0 Ron Michallick over 7 years ago in reply to SRINIVASAN E

TI__Guru**** 151696 points

Srinivasan,

Is line regulation only a problem when the line pressure changes quickly, or is it also a problem when the input pressure changes slowly?

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LM324: LINE EGULATION