Using a dual-inductor line filter as a DC-DC transformer?

Started by P E Schoen in sci.electronics.design6 years ago 12 replies

I have seen a design for a high-power (200kW) AC motor controller that uses dual-inductor AC line chokes for a DC-DC converter for IGBT gate...

I have seen a design for a high-power (200kW) AC motor controller that uses dual-inductor AC line chokes for a DC-DC converter for IGBT gate drive power supplies. http://enginuitysystems.com/pix/electronics/200kW_AC_Controller_p3.png I have found some chokes rated 500 uH and 1 amp, with 250 VAC rated isolation, for less than a dollar each: http://www.mouser.com/ds/2/212/KEM_LF0016_SU9V-...


~60V shunt regulator... or not?

Started by Anonymous in sci.electronics.design3 years ago 7 replies

I recently bought one of these: https://www.aliexpress.com/item/4000282551930.html which requires up to 70V input. I've made this circuit from an...

I recently bought one of these: https://www.aliexpress.com/item/4000282551930.html which requires up to 70V input. I've made this circuit from an old UPS transformer and junk box parts: https://www.falstad.com/circuit/circuitjs.html?cct=$+1+0.000005+19.867427341514983+50+5+43%0Av+16+208+16+336+0+1+50+44+0+0+0.5%0Ad+128+208+192+144+2+default%0Ac+400+208+400+304+0+0.008+41.723648663


Old school Push pull audio amplifier transformer flux managment

Started by mike daniels in sci.electronics.design12 months ago 13 replies

I have a switched mode power supply background and an looking at something like this for an old school audio amp...

I have a switched mode power supply background and an looking at something like this for an old school audio amp design. https://www.circuitstoday.com/push-pull-amplifier For SMPS pushpull we always used current mode control to assure the flux in the core does not walk all the way into saturation. Looking at these designs, none monitor or measure the current to assure the flux


Fail to amplify 27mhz rf using mosfet IRF843

Started by Anonymous in sci.electronics.design6 years ago 20 replies

I found old mosfet transistor IRF843, using 20k and 70k resistor, i manage to set the voltage at transistor gate to 3.9 volt and using 1uF to...

I found old mosfet transistor IRF843, using 20k and 70k resistor, i manage to set the voltage at transistor gate to 3.9 volt and using 1uF to channel the 27mhz rf signal to the transistor gate, i manage to get an audio from 8ohm speaker connected to the transistor drain. I'm using about 5.3 volt power supply from transformer. The audio is loud and clear. The mosfet gate can received


Antenna Simulation in LTspice

Started by rickman in sci.electronics.design10 years ago 41 replies

I am working on a simulation for a loop antenna in LTspice and I can't figure out why the signal strength features are what they are. The...

I am working on a simulation for a loop antenna in LTspice and I can't figure out why the signal strength features are what they are. The model uses a pair of loosely coupled inductors to model the transmitter and antenna loop with a separate pair of tightly coupled inductors to model the coupling transformer. A cap on the primary circuit is the tuning cap and a cap on the secondary is...


Ethernet magnetics polarity?

Started by Anonymous in sci.electronics.design15 years ago 2 replies

When using a gigabit ethernet PHY. Does it matter if one wires the magnetics with the "wrong" polarity like below ..? (reason being pcb routing,...

When using a gigabit ethernet PHY. Does it matter if one wires the magnetics with the "wrong" polarity like below ..? (reason being pcb routing, and the ethernet transformer isn't straightforward) From this: To this: RJ45 pin1 --- MX1+ ** TD1+ --- MDIA_P RJ45 pin1 --- MX1- ** TD1- --- MDIA_P RJ45 pin2 --- MX1- ** TD1- --- MDIA_N RJ45 pin2 --- MX1+ ** ...


transformer coupled logic isolator

Started by Anonymous in sci.electronics.design11 months ago 61 replies

Version 4 SHEET 1 880 680 WIRE 480 -32 384 -32 WIRE 608 -32 560 -32 WIRE 608 80 608 -32 WIRE 608 80 544 80 WIRE 656 80 608 80 WIRE 688 80...

Version 4 SHEET 1 880 680 WIRE 480 -32 384 -32 WIRE 608 -32 560 -32 WIRE 608 80 608 -32 WIRE 608 80 544 80 WIRE 656 80 608 80 WIRE 688 80 656 80 WIRE -112 96 -160 96 WIRE -64 96 -112 96 WIRE 48 96 16 96 WIRE 80 96 48 96 WIRE 240 96 192 96 WIRE 272 96 240 96 WIRE 384 96 384 -32 WIRE 384 96 336 96 WIRE 432 96 384 96 WIRE 480 96 432 96 WIRE -160 144 -160 96 WIRE 80 144 80 96 WIRE ...