Resonant converter with auxiliary resonant components and holdup time control circuitry
First Claim
1. A resonant power converter comprising:
- an input power conversion switching circuit comprising a plurality of power conversion switches coupled to a line voltage input to the power converter;
a series resonant circuit coupled to an output side of the power conversion switching circuit and comprising a resonant inductance circuit, a resonant capacitance circuit, and a magnetizing inductance circuit;
wherein at least one of the resonant inductance circuit, the resonant capacitance circuit, and the magnetizing inductance circuit in the series resonant circuit further comprise at least first and second circuit branches and a switch controllable to regulate an inductance or capacitance value corresponding to the respective circuit; and
a control circuit effective todetect a holdup time condition associated with a line voltage failure, andgenerate control signals to adjust a switch state for the switch in the series resonant circuit in accordance with determining a first operating mode associated with the holdup time condition or a second operating mode associated with normal operation of the converter.
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Accused Products
Abstract
A resonant power converter is provided with auxiliary circuit branches and control circuitry for switchably coupling the auxiliary branches to resonant circuit components during holdup times. Auxiliary branches are coupled in parallel with any one or more of a resonant inductor, a resonant capacitor, and a magnetizing inductive winding via respective switches. When a holdup time condition is detected in accordance with, for example, a drop in the mains line voltage, the switches are controlled to adjust the corresponding inductance or capacitance for the duration of the holdup time condition or otherwise for a predetermined duration. The power converter in normal operation is configured for high efficiency and in a holdup time operation is configured to produce sufficient holdup time.
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Citations
20 Claims
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1. A resonant power converter comprising:
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an input power conversion switching circuit comprising a plurality of power conversion switches coupled to a line voltage input to the power converter; a series resonant circuit coupled to an output side of the power conversion switching circuit and comprising a resonant inductance circuit, a resonant capacitance circuit, and a magnetizing inductance circuit; wherein at least one of the resonant inductance circuit, the resonant capacitance circuit, and the magnetizing inductance circuit in the series resonant circuit further comprise at least first and second circuit branches and a switch controllable to regulate an inductance or capacitance value corresponding to the respective circuit; and a control circuit effective to detect a holdup time condition associated with a line voltage failure, and generate control signals to adjust a switch state for the switch in the series resonant circuit in accordance with determining a first operating mode associated with the holdup time condition or a second operating mode associated with normal operation of the converter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A resonant power converter comprising:
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a pair of input terminals effective to receive input power from a power source; an input power conversion switching circuit comprising a plurality of power conversion switches coupled to the input terminals and an output side; a series resonant circuit coupled to the output side of the input power conversion switching circuit and comprising a resonant inductance, a resonant capacitance, a magnetizing inductance and at least one switch having first and second switch states associated with first and second values for a corresponding one or more of said resonant inductance, resonant capacitance and magnetizing inductance; a feedback circuit coupled to the pair of input terminals and effective to generate output signals representative of the input power; a control circuit effective to receive the output signals from the feedback circuit, compare an amplitude of the output signals from the feedback circuit to a predetermined threshold, determine a holdup time condition or a normal condition wherein the amplitude of the output signals from the feedback circuit is below or above the threshold, and generate control signals to turn on and off the least one switch based on the determination. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of gain enhancement in a resonant power converter having a resonant inductance, a resonant capacitance and a magnetizing inductance, the method comprising:
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monitoring signals representative of a line voltage input to the resonant power converter; comparing an amplitude of the representative signals to a predetermined reference voltage; determining a holdup time condition in accordance with a line voltage input falling below the predetermined reference voltage; and adjusting one or more of the resonant inductance, the resonant capacitance and the magnetizing inductance from a first value to a second value upon determining the holdup time condition. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification