kesmez1
Newbie level 6
I have just finished the power supply project.
Circuit supply can be done with 48 volt dc 150 watts smps or transformer. The circuit requires a 5 volt additional supply with 48 volts.
Mje3055 can be used instead of 2n3055. This transistor should be cooled with a 5 watt cooler. The 3055 transistor heats up to 5 watts maximum at each voltage in a 4 amp load current.
Voltage setting is done with 50k potentiometer and current setting is done with 1k potentiometer.
I have not yet implemented the circuit practically. I will do it. There may be a problem. Those who want to do can make the circuit. The circuit is working in a simulated environment.
The characteristic of the circuit is that it does not need a very large cooler and different supply voltages.
C3, C6 and C10 must be low esr (low impedance) type.
Extract the rar file to a folder.
You can run the ASC file with the free ltspice simulator.
The circuit is working in the high side step down topology. Pre-regulation. The goal is to produce 1.2 volts of the required 3055 emitter voltage. The 48 volt input voltage can be reduced to 40 - 45 volts. I chose it because it has a 48 volt standard smps output.
For minimum heating of the 3055, the Vce voltage had to be at a minimum. I think the best voltage is 1.2 volts. The collector power consumption of this transistor is 1.28 = 4.8 watts at 4 amps.
To make the output ampere 8 amps, we need to parallel the pair of bc 327 mje3055. I need to use 3 pairs for 12 amps. But in this case you need to increase your power in the step down section.
Circuit supply can be done with 48 volt dc 150 watts smps or transformer. The circuit requires a 5 volt additional supply with 48 volts.
Mje3055 can be used instead of 2n3055. This transistor should be cooled with a 5 watt cooler. The 3055 transistor heats up to 5 watts maximum at each voltage in a 4 amp load current.
Voltage setting is done with 50k potentiometer and current setting is done with 1k potentiometer.
I have not yet implemented the circuit practically. I will do it. There may be a problem. Those who want to do can make the circuit. The circuit is working in a simulated environment.
The characteristic of the circuit is that it does not need a very large cooler and different supply voltages.
C3, C6 and C10 must be low esr (low impedance) type.
Extract the rar file to a folder.
You can run the ASC file with the free ltspice simulator.
The circuit is working in the high side step down topology. Pre-regulation. The goal is to produce 1.2 volts of the required 3055 emitter voltage. The 48 volt input voltage can be reduced to 40 - 45 volts. I chose it because it has a 48 volt standard smps output.
For minimum heating of the 3055, the Vce voltage had to be at a minimum. I think the best voltage is 1.2 volts. The collector power consumption of this transistor is 1.28 = 4.8 watts at 4 amps.
To make the output ampere 8 amps, we need to parallel the pair of bc 327 mje3055. I need to use 3 pairs for 12 amps. But in this case you need to increase your power in the step down section.
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