METHOD FOR PUSH-PULL SYMMETRIC DC VOLTAGE PULSE CONVERSION Russian patent published in 2004 - IPC

FIELD: electrical engineering; dc-to-dc voltage converters and voltage regulators; power supply, charging, and driving systems.

SUBSTANCE: proposed method includes first stage of input reactor energy increase from input energy during periodic process with closed condition of first switch as well as transfer of part of first capacitor energy through cross-inductance transformer and first rectifier diode to first storage capacitor and output; and second stage with first switch held open, when input energy and reactor input energy increase that of first capacitor, and this energy is transferred through cross-inductance transformer and second rectifier diode to second storage capacitor and to output whereto part of second-capacitor energy supplied to this capacitor during initial period of this stage from input energy and input capacitor energy is also transferred through second switch held closed. In the process certain control switching delays are introduced for alternate change-over of semiconductor device of switches to reduce loss and to shape path in changing over these semiconductor devices for energy exchange between transformer cross inductance and inherent capacitances of semiconductor devices of switches and capacitors additionally connected to them. Power supply energy is continuously consumed during both different-time stages of period, energies of first and second capacitors vary relative to their mean values, symmetrical polarity reversal-process takes place at transformer without dc component of magnetizing current, and its maximal utilization ratio complies with push-pull bridge conversion; voltage across first and second switches in open position are of trapezoidal waveform with flat spike-free top. Capacitive kind of rectifier output provides for generating a number of well coordinated output channels.

EFFECT: reduced loss, enhanced reliability of switches and diodes.

1 cl, 2 dwg