Dual stage AC to DC switching power supply with high voltage, lo

Details Dual stage AC to DC switching power supply with high voltage, lo Dual stage AC to DC switching power supply with high voltage, lo

1996-07-03

1999-01-26

Sterrett, Jeffrey L.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 97, H02M 3335

Patent

active

058644733

ABSTRACT:
AC power is converted to a low-voltage, high-current DC output by a power supply which contains two stages. The first stage is an AC to DC converter using a full wave bridge rectifier to convert the voltage from the AC source to an intermediate raw DC voltage. The second stage is a DC to DC forward converter using a transformer with its primary winding connected to the intermediate raw DC voltage through a switch which is cycled "on" and "off" at a predetermined frequency. During the switch "on" portions of the cycle a current flows in the primary winding powering the output and charging an inductor which is connected to the secondary winding. When the switch is turned "off", no current flows through the transformer and the load is powered by the energy stored in the inductor. A secondary coil is magnetically coupled to the inductor and has a induced voltage proportional to the output voltage. A controller is used to control the duty cycle of the switch based on the voltage in the secondary coil which determines the power supply output. The duty cycle of the switch is varied in response to variations in the load.

REFERENCES:
patent: 4706176 (1987-11-01), Kettschau
patent: 4885674 (1989-12-01), Varga et al.
patent: 5012401 (1991-04-01), Barlage
patent: 5408401 (1995-04-01), Miyazaki
patent: 5408402 (1995-04-01), Nonnenmacher
patent: 5459652 (1995-10-01), Faulk

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