EDIT: Forum doesn't like ascii diagrams
I am relatively new to power electronics, I have a 24VAC line from a 120-24 isolation transformer. I need to convert it to 12V and 5V DC. (I assume this is somewhat common). I initially tried to rectify the 24VAC line to 18V by using a capacitor, resistor transistor, diode, zener diode circuit. From there I was going to use two small buck regulators to get 12V and 5V. Unfortunately the transistor runs too hot. I assume there is a much better way of doing this (maybe a package you can purchase) that everyone knows except me, so thought I'd throw it out here for suggestions.
24VAC feeds into a diode, rectifying circuit, then into collector of transistor
transistor base connected to 18V Zener, which is connected to ground (transistor closes when zener breaksdown)
10KOhm resistor connected between collector and base
Capacitors on both collector and emitter to hold charge.
Sorry for the crappy circuit. Thanks.
I am relatively new to power electronics, I have a 24VAC line from a 120-24 isolation transformer. I need to convert it to 12V and 5V DC. (I assume this is somewhat common). I initially tried to rectify the 24VAC line to 18V by using a capacitor, resistor transistor, diode, zener diode circuit. From there I was going to use two small buck regulators to get 12V and 5V. Unfortunately the transistor runs too hot. I assume there is a much better way of doing this (maybe a package you can purchase) that everyone knows except me, so thought I'd throw it out here for suggestions.
24VAC feeds into a diode, rectifying circuit, then into collector of transistor
transistor base connected to 18V Zener, which is connected to ground (transistor closes when zener breaksdown)
10KOhm resistor connected between collector and base
Capacitors on both collector and emitter to hold charge.
Sorry for the crappy circuit. Thanks.
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