Inrush current control during starting of resonant converters
AssigneeMurata Manufacturing Co., Ltd.
InventorsBing GONG, Jahangir AFSHARIAN
Life of this patent
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Abstract
A converter with soft start includes a transformer; first and second switches connected to the transformer to supply power to the transformer; a controller connected to the first and second transistors and arranged to, during startup of the converter, switch the first switch with a variable duty cycle and switch the second switch with either a fixed duty cycle or a variable duty cycle with pulses larger than pulses of the variable duty cycle of the first switch; and a bleed device arranged to set initial conditions of the converter before startup of the converter by discharging a capacitor in the converter before startup.
Claims20
A converter with soft start comprising:
- a transformer;
- first and second switches connected to the transformer to supply power to the transformer;
- a controller connected to the first and second transistors and arranged to, during startup of the converter, switch the first switch with a variable duty cycle and switch the second switch with either a fixed duty cycle or a variable duty cycle with pulses larger than pulses of the variable duty cycle of the first switch;
- and
- a bleed device arranged to set initial conditions of the converter before startup of the converter by discharging a capacitor in the converter before startup.
A soft-start method for a converter comprising the steps of:
- providing a converter that includes:
- a transformer;
- and
- first and second switches connected to the transformer to supply power to the transformer;
- before startup of the converter, setting initial conditions of the converter by discharging a capacitor in the converter before startup;
- and
- during startup of the converter, switching the first switch with a variable duty cycle and switching the second switch with either a fixed duty cycle or a variable duty cycle with pulses larger than pulses of the variable duty cycle of the first switch.
Dependencies are inferred from the claim text.