In a converter-controller the controller includes a primary power device
coupled to a primary coil and a resonant reset capacitor in parallel with
the primary power device. The controller can switch the primary power
device with a variable frequency. The resonant capacitor and the primary
coil have a primary resonant cycle. The controller can turn on/off the
primary power device for half of the primary resonant cycle. The
controller includes a first secondary power device, having a first
voltage and a second secondary power device, having a second voltage,
each voltages having a rising threshold-point and a falling
threshold-point. The first and second secondary power devices are coupled
to the control logic and to corresponding terminals of the secondary
coil. The controller can synchronize the rising threshold-point of the
first voltage with the falling threshold-point of the second voltage or
vice versa.