Resonant converter with phase delay control
AssigneeInternational Rectifier Corporation
InventorThomas J. Ribarich
Life of this patent
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Abstract
A phase delay control for a power converter operates with a phase locked loop and current sense feedback to provide improved control stability and dynamic output range. The phase lock loop includes a voltage controlled oscillator that is controlled based on an error signal derived from a phase of the power converter output. The error signal applied to the voltage controlled oscillator produces a shift in switching frequency for the converter to drive the error to zero. The power converter includes an LCC resonant circuit to manipulate resonant electrical energy to improve switching speed and power density.
Claims20
A power converter controller for controlling a resonant power converter, comprising:
- current sense circuitry for detecting a phase of a power converter feedback signal and providing a related phase angle signal;
- a phase locked loop circuit for controlling a switching frequency of the power converter, the phase angle signal being applied to an input of the phase locked loop;
- a phase angle error signal generated in the phase locked loop in relation to a reference phase angle and the phase angle signal;
- a voltage controlled oscillator in the phase locked loop for adjusting a switching frequency of the resonant power converter, the phase angle error signal being applied to an input of the voltage controlled oscillator;
- switch output circuitry coupled to the phase lock loop for controlling switching of power switches in the resonant power converter;
- and
- the power converter feedback signal being influenced by switching the power switches in the resonant converter, such that a power output of the resonant power converter is controllable through phase adjustment provided by the phase locked loop.
A power converter, comprising:
- a resonant circuit for storing electrical energy;
- a half bridge switching arrangement coupled to the resonant circuit for controlling transfer of the electrical energy into and out of the resonant circuit;
- a controller coupled to the half bridge circuit for controlling switching of switches in the half bridge circuit;
- a current sensing device coupled to the half bridge circuit and to the controller for providing a current sense signal to the controller;
- a current sense signal circuit in the controller for providing a phase angle signal based on the current sense signal;
- and
- a phase locked loop in the controller operable to accept the phase angle signal and provide a switching control for switching the switches in the half bridge circuit such that a phase of the electrical energy in the resonant circuit is adjusted towards a reference phase.
Dependencies are inferred from the claim text.