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Hello

Attached is the simplified circuit of a power supply I'm building.
TRANSHI and TRANSLO are the high and low voltages of a transformer,
VAC is the mains supply.

The purpose of this circuit is to control an electromagnet, the low
voltage feeding a circuit containing a dsPIC reading sensor data, the
high side supplying up to 1A, 200V to the magnet coils, controlled via
a MOSFET which in turn receives PWM from the PIC and its excitation
circuit.

The problem is that when I connect the two grounds of the high voltage
and low voltage supplies smoke happens. The low voltage ground is held
steadily at half the high voltage and even if I put a resistor in
there an uncomfortable amount of juice flows and there=B4s no
significant difference in voltage levels.

I think I'm missing something obvious here. My transformer is
isolated, the ohmmeter doesn't even show a resistance reading
resistance between the coils. Shouldn't the low level supply, when the
grounds are connected, float to meet the high voltage ground
potential?

I know I could use a 1:1 transformer on the high side but it would be
heavy and big and lossy and I'd rather not. As much as I think about
my supply design I can't see anything wrong with it.

I could use an optocoupler but I'm very worried about adding delays in
a 100 kHz PWM line which may operate down to as little as 0,1% (10 ns)
duty cicle. That would also require a transformerless supply for the
MOSFET excitation circuit so I'd really like to make this circuit
work.

Or at least find out why this doesn't work. Anyone know?

Thanks.

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