Hi all
I've spent many hours trying to design a circuit that fits my need but still didn't reach a good design..
The circuit will have a voltage source as input with voltage 24V DC, the voltage could reach 30V and maybe 32V. The input voltage decreases down to 12V and even less.
Now, the circuit have an output voltage that doesn't exceed 24~26V and disconnects when the input voltage becomes less then 12V. The output voltage could be fixed at any voltage between 24 and 12 or can change according to the input voltage and the circuit... The main point is to have the output voltage not exceed 24~26V and of course not less than 12V or say >15V. The output current should be about 2A, better to be more than 2A.
I thought about looking for an smps dc-dc converter than does what I need, but didn't found such thing in the market.
I tried to make a circuit with several diodes that drops about 6V when the voltage is >24V, and using a comparator circuit with relay... it was an unstuck one.
I also thought about using a linear regulator as 78XX with power PNP transistor for current boosting... but this way will dissipate a lot of power especially when the input voltage is high.
SMPS converter along with a low voltage cutoff circuit is the best way.. but designing smps is a not easy.
Regards,
Hazim
I've spent many hours trying to design a circuit that fits my need but still didn't reach a good design..
The circuit will have a voltage source as input with voltage 24V DC, the voltage could reach 30V and maybe 32V. The input voltage decreases down to 12V and even less.
Now, the circuit have an output voltage that doesn't exceed 24~26V and disconnects when the input voltage becomes less then 12V. The output voltage could be fixed at any voltage between 24 and 12 or can change according to the input voltage and the circuit... The main point is to have the output voltage not exceed 24~26V and of course not less than 12V or say >15V. The output current should be about 2A, better to be more than 2A.
I thought about looking for an smps dc-dc converter than does what I need, but didn't found such thing in the market.
I tried to make a circuit with several diodes that drops about 6V when the voltage is >24V, and using a comparator circuit with relay... it was an unstuck one.
I also thought about using a linear regulator as 78XX with power PNP transistor for current boosting... but this way will dissipate a lot of power especially when the input voltage is high.
SMPS converter along with a low voltage cutoff circuit is the best way.. but designing smps is a not easy.
Regards,
Hazim