0
\$\begingroup\$

I found this converter-circuit on the Internet. I will use it to power an IR2153, which contains a 15,6V zener. I chose to use it because of the large losses of a resistive dropper. The unmarked voltages are unknown. Diodes- high speed (BA159, UF4007 etc.)

Circuit

\$\endgroup\$
  • 4
    \$\begingroup\$ very dangerously \$\endgroup\$ – Trevor_G May 17 '17 at 16:54
2
\$\begingroup\$

Very inefficiently: The 0.22uF cap and 100 ohm resistor create an RC oscillator, periodically turning on BUX85. The 4.7mH inductor smoothes out the voltage somewhat, and the zener tries to make it a regulated 15ish volts. Altogether it's an inefficient and dangerous design. Good luck getting it to pass UL.

\$\endgroup\$
  • \$\begingroup\$ This isn't a production design.. also, it's on the mains side anyway. For me, as long as it doesn't go BANG it's ok! \$\endgroup\$ – cccp3 May 17 '17 at 19:13
  • \$\begingroup\$ Besides, max. output current is ~20mA. \$\endgroup\$ – cccp3 May 17 '17 at 19:17
  • \$\begingroup\$ to me I see resonance of 4.7mH and 100uF near 250Hz and 100 ohm as a current limiter for 0.7V/100 for 7mA, not an oscillator besides UL does not care if it is used outside US with 50Hz, 230V \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 May 17 '17 at 19:40

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.