..At the initial stage started with LT1084 and LM338. Both went to break down condition ...
.... my MJ4502 got hot and burned and also used TIP142/147,2N3055 etc. but all these circuit failed
....... shops in chennai ....
I want to design lab power supply with the transformer rating of 30V , 5 ampere using LM317 or LM723. Because after rectification it would give around 42V Pulsating DC, So both these IC could Handle voltage around 40V.
Please find attachment.I can't understand the function of opamp which is acting as comparator with many passive devices. It would give insight ,if explained with some assumptions at circuit nodes.
Hi to all..
I want to design lab power supply with the transformer rating of 30V , 5 ampere using LM317 or LM723. Because after rectification it would give around 42V Pulsating DC, So both these IC could Handle voltage around 40V. Hence this is the reason for adapting to these ICs.
At the initial stage started with LT1084 and LM338. Both went to break down condition and they are much costly then LM317 and LM723. I went outboard transistor for current boosting(for LM317) but my MJ4502 got hot and burned and also used TIP142/147,2N3055 etc. but all these circuit failed and I have used old 1ohm/25watt resistor for loading. I have taken output of secondary of transformer and connected 6A bridge and connected my regulator ICs(317 or723) but every thing failed.
I want design power supply which should have control over voltage and current ,should be reliable in delivering power to load.Please help me in this regard.
I have seen Video of Dave jones for constructing power supply. The problem is LT3080 is a current reference based regulator which is costly and not available in shops in chennai.Thanks Jones.
In order to achieve the best qualities of the linear power supply and the switched mode power supply, one could use a tracking switched mode pre-regulator which can be bypassed on light loads. In that way one can get a decent high current performance with reduced switching noise and good low current performance without switching noise, while minimizing the thermal problems.
In order to achieve the best qualities of the linear power supply and the switched mode power supply, one could use a tracking switched mode pre-regulator which can be bypassed on light loads. In that way one can get a decent high current performance with reduced switching noise and good low current performance without switching noise, while minimizing the thermal problems.I personally would like a mains-direct approach instead, using adjustable isolated mains switching regulator chained to the linear regulator. This allows the mains-side optimizations like power factor correction to be used.
In order to achieve the best qualities of the linear power supply and the switched mode power supply, one could use a tracking switched mode pre-regulator which can be bypassed on light loads. In that way one can get a decent high current performance with reduced switching noise and good low current performance without switching noise, while minimizing the thermal problems.I personally would like a mains-direct approach instead, using adjustable isolated mains switching regulator chained to the linear regulator. This allows the mains-side optimizations like power factor correction to be used.Typically the mains switching power supplies have a Y-capacitor between the mains and the secondary causing sufficient leakage current which can damage sensitive electronics. The mains transformer can have multiple, isolated secondaries with adjustable regulators so one can get multiple isolated and independent outputs in addition to the better mains insulation. Also, using the mains smps one cannot achieve the low noise benefits of the linear power supply on lighter loads.
In order to achieve the best qualities of the linear power supply and the switched mode power supply, one could use a tracking switched mode pre-regulator which can be bypassed on light loads. In that way one can get a decent high current performance with reduced switching noise and good low current performance without switching noise, while minimizing the thermal problems.I personally would like a mains-direct approach instead, using adjustable isolated mains switching regulator chained to the linear regulator. This allows the mains-side optimizations like power factor correction to be used.Typically the mains switching power supplies have a Y-capacitor between the mains and the secondary causing sufficient leakage current which can damage sensitive electronics. The mains transformer can have multiple, isolated secondaries with adjustable regulators so one can get multiple isolated and independent outputs in addition to the better mains insulation. Also, using the mains smps one cannot achieve the low noise benefits of the linear power supply on lighter loads.That Y capacitor isn't necessarily required. I am designing not aiming at minimum ripple, but a compromise between ripple and efficiency. Maybe I cannot guarantee the 20uV ripple, but I can shoot for a 80 Plus Gold rating.
Dear all,
please give me some reference to study the Study of Regulated power Supply and Various Pre regulator circuit using SMPS Techniques.