Hello,
Which device best protects the rectifier and electronics inside an older style car battery charger? I have seen some manufacturers use an ATC blade fuse but I'm not sure if that will act fast enough to protect the circuits. I came across another device too, it's a Bussmann Circuit Breaker BP-UCB-10-RP. One advantage is that I don't need to open up the charger to replace the fuse if I go with the breaker. But one concern I have is which acts faster. Also, is there any other technique that you guys can recommend of these two are not really sufficient? I don't want to build a very complicated circuit either. Something simple that gets the job done.
The transformer inside is a Bosch 130VA 14/9VAC connected to a KBPC3510A full bridge rectifier (the original charger case was changed with a Schumacher charger since the orange plastic body had a burned section where the selenium rectifier originally was). But since the charger originally had a selenium rectifier which got damaged and was replaced with a silicon rectifier. But since selenium rectifiers have a higher voltage drop you can see the transformer output is 14VAC for the 12V setting & 9VAC for the 6V setting (had around 14.5VDC & 7.3VDC with selenium rectifiers) compared to silicon rectifier chargers where the transformer output is around 10-11VAC. Since the bridge rectifier had only a 1.1V the rectified output was too high and I ended up using a 35V 4700uF capacitor and then used two 300W DC-DC buck converters to step down the voltage to 14.4/7.2VDC and the current limited each unit to 5A since the specs say above 8A a fan is needed. So, it's now rated to the original max current setting. So, I want to protect the unit in case of accidental short circuits and the transformer mainly.
Cheers!
Which device best protects the rectifier and electronics inside an older style car battery charger? I have seen some manufacturers use an ATC blade fuse but I'm not sure if that will act fast enough to protect the circuits. I came across another device too, it's a Bussmann Circuit Breaker BP-UCB-10-RP. One advantage is that I don't need to open up the charger to replace the fuse if I go with the breaker. But one concern I have is which acts faster. Also, is there any other technique that you guys can recommend of these two are not really sufficient? I don't want to build a very complicated circuit either. Something simple that gets the job done.
The transformer inside is a Bosch 130VA 14/9VAC connected to a KBPC3510A full bridge rectifier (the original charger case was changed with a Schumacher charger since the orange plastic body had a burned section where the selenium rectifier originally was). But since the charger originally had a selenium rectifier which got damaged and was replaced with a silicon rectifier. But since selenium rectifiers have a higher voltage drop you can see the transformer output is 14VAC for the 12V setting & 9VAC for the 6V setting (had around 14.5VDC & 7.3VDC with selenium rectifiers) compared to silicon rectifier chargers where the transformer output is around 10-11VAC. Since the bridge rectifier had only a 1.1V the rectified output was too high and I ended up using a 35V 4700uF capacitor and then used two 300W DC-DC buck converters to step down the voltage to 14.4/7.2VDC and the current limited each unit to 5A since the specs say above 8A a fan is needed. So, it's now rated to the original max current setting. So, I want to protect the unit in case of accidental short circuits and the transformer mainly.
Cheers!
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