Off-line switching mode power supply

Details Off-line switching mode power supply Off-line switching mode power supply

H - Electricity

02

M

321/29

H02M 3/337 (2006.01) H02M 3/335 (2006.01) H04M 19/04 (2006.01)

Patent

CA 1234598

L.J Sutton-l Abstract of the Invention An off-power line switching mode power supply which employs current and voltage feedback and sensing converts primary rectified, unregulated high voltage to a number of regulated d.c. secondary voltages and a low frequency, high voltage output suitable for enabling ringing of standard telephones. Two high voltage field effect transistors connected in the . half-bridge configuration power multiple output circuits via a capacitively coupled transformer. A pulse width modulator controls the high frequency switching times of the field effect transistors via a transformer-coupled drive circuit.

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