Dear Readers,
I am designing phase loss detection circuitry for the input 3-phase supply for an electric drive.
This circuitry must simply do the following….
1. Detect when all three input phases are present
2. Detect when one input phase has been lost
3. Detect when two input phases...
Dear Engineers,
I am currently making an offline flyback SMPS. It uses two MOSFETs in the primary circuit and so I need an isolated gate drive.
Here is my investigative attempt thus far. Unfortunately, the output is only 0 to 7V instead of the required 0 to 16V.
I would be very grateful...
I have thick film planar resistors dissipating 2KW.
They are mounted on a heatsink with thermal resistance = 0.144 degree C/watt.
The resistor datasheet says that if the heatsink gets above 210 degrees C then the resistors can handle zero percent of their rated power. (Each resistor can handle...
I would be very grateful for help on the test procedure for a video amplifier that my company makes.
I am sure my company will not be harmed by me anonymously posting a link to a brief-ish form of the schematic here, as its only simple inverting stages and an analog multiplier IC...
Dear Readers,
I have recently been testing a push-pull SMPS with isolated secondary...except the secondary has only half-wave (as oppose to full-wave) rectification. (That is, it just uses one diode.) The feedback coil also has only half-wave rectification.
This SMPS uses TL598 PWM controller...
Hi,
I am driving an N-Type MOSFET in an offline flyback SMPS. At the moment , the drive circuit is as follows...
However, I believe that the gate capacitance must have a discharge path to ground to make the MOSFET switch quicker...therefore, i have dreamed up the following circuit....
I...
Hello,
My offline flyback auxiliary coil voltage wanders too much with changes in load. So i am going to try and power the PWM controller from isolated "off-the-shelf" DCDC converters connected to the 24V isolated secondary of the flyback.
I've never seen this circuit in a book or...
