Resonant converter with phase delay control
First Claim
Patent Images
1. A power converter controller for controlling a resonant power converter, comprising:
- phase detection circuitry for detecting a zero crossing phase angle of a power converter output signal and providing a related zero crossing phase angle signal;
a phase locked loop circuit for controlling a switching frequency of the power converter, the zero crossing 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 zero crossing phase angle and the zero crossing phase angle signal; and
a variable frequency oscillator in the phase locked loop for adjusting a switching frequency of the resonant power converter, the phase angle error signal being operable to influence the variable frequency oscillator to adjust the frequency of the variable frequency oscillator and influence the zero crossing chase angle, whereby the phase angle error signal is urged toward zero.
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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.
75 Citations
20 Claims
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1. A power converter controller for controlling a resonant power converter, comprising:
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phase detection circuitry for detecting a zero crossing phase angle of a power converter output signal and providing a related zero crossing phase angle signal;
a phase locked loop circuit for controlling a switching frequency of the power converter, the zero crossing 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 zero crossing phase angle and the zero crossing phase angle signal; and
a variable frequency oscillator in the phase locked loop for adjusting a switching frequency of the resonant power converter, the phase angle error signal being operable to influence the variable frequency oscillator to adjust the frequency of the variable frequency oscillator and influence the zero crossing chase angle, whereby the phase angle error signal is urged toward zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An integrated circuit for driving first and second MOS gated power transistors connected in a half bridge arrangement for supplying power to a resonant load, the half bridge arrangement of the first and second MOS gated power transistors supplying an oscillating input voltage to the resonant load, the input voltage having a phase, the resonant load having a current flowing therethrough, the current flowing through said resonant circuit having a phase, the integrated circuit comprising:
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means for determining the phase of the current flowing through the resonant load; and
means for maintaining a substantially constant relationship between the phase of the input voltage and the phase of the resonant load current, thereby regulating the resonant load power.
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15. A power converter, comprising:
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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 phase angle detection circuit in the controller for providing a zero crossing phase angle signal based on the current sense signal; and
a phase locked loop in the controller operable to accept the zero crossing 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 to drive a difference between the zero crossing phase angle signal and a reference zero crossing signal to zero. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification