RESONANT CONVERTER WITH SWITCHING FREQUENCY AUTOMATIC PHASE TUNING WIDTH-PULSE ADJUSTMENT METHOD

摘要

FIELD: electrical equipment.;SUBSTANCE: invention relates to the field of electrical equipment and can be used in one level direct current into the different level direct current conversion devices, in particular in power supply sources. Method of pulse-width adjustment of the output voltage of a resonant converter is that a predetermined voltage level is maintained on the load of the resonant converter, for which purpose the voltage value is measured on the load of the resonant converter and a constant voltage signal proportional to the load value is formed. Setting the setpoint voltage proportional to the supported voltage level on the load, and generating the difference signal (DS) using the proportional-integral-differentiating controller. AC signal proportional to the loop current is formed, it is converted into an AC voltage signal (ACVS) and the instant of the AC voltage signal transition through zero is monitored. Depending on the DS size, setting the PWM controller generation frequency, clocked by the voltage controlled oscillator (VCO), using which generating the certain width pulses. Pulses are supplied to the inverter key elements control electrodes, at that, providing the pulse width phase self-tuning, setting the filling factor so, at which the signal front VCO formation instant coincides in time with the instant of transition through the ACVS zero.;EFFECT: technical result consists in the pulse width phase auto-tuning by the loop current feedback introduction to provide the zero phase offset between the circulating in the loop current and control signals.;1 cl, 6 dwg