Switching scheme for power supply having a voltage-fed inverter
AssigneePhilips Electronics North America Corporation
InventorsChin Chang, Joseph En-Cheng Chang
Life of this patent
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Abstract
A power supply is disclosed which includes a resonant circuit, and a voltage-fed inverter producing an applied voltage at an output coupled to the resonant circuit, the inverter responsive to a driving signal. A driving circuit has an input representing the sensed current flowing through the resonant circuit and includes phase-shifting circuitry. The driving circuit produces the driving signal based on phase-shift of the sensed current by the phase-shifting circuitry.
Claims19
A power supply, which comprises:
- a) a resonant circuit;
- b) a voltage-fed inverter producing a voltage at an output coupled to the resonant circuit, the inverter responsive to a driving signal;
- and
- c) a driving circuit having an input representing a sensed current flowing through the resonant circuit and including phase-shifting circuitry, the driving circuit producing the driving signal based on a phase-shift of the sensed current by the phase-shifting circuitry.
A power supply, which comprises:
- a) a resonant circuit;
- b) a voltage-fed half-bridge inverter producing a voltage at an output coupled to the resonant circuit, the inverter responsive to a driving signal;
- and
- c) a driving circuit having an input representing a sensed current oscillating through the resonant circuit and including phase-shifting circuitry, the driving circuit producing the driving signal based on a phase-shift of the sensed current by the phase-shifting circuitry.
A method for switching a power supply, which comprises:
- providing a resonant circuit having a current oscillating therethrough;
- providing an inverter responsive to a driving signal and producing a voltage at an output coupled to the resonant circuit;
- applying a phase-angle shift to the current oscillating through the resonant circuit and producing a phase-shifted current signal;
- driving the inverter based upon the phase-shifted current signal.
A method for switching a power supply, which comprises:
- providing a resonant circuit having a current oscillating therethrough;
- providing an inverter responsive to a driving signal and producing a voltage at an output coupled to the resonant circuit;
- sensing the current oscillating through the resonant circuit and producing a sensed current signal proportional to the current;
- applying a phase-angle shift to the sensed current signal and producing a phase-shifted signal;
- and
- applying a driving signal to the inverter based upon zero-crossing points of the phase-shifted signal.
Dependencies are inferred from the claim text.