Resonant switching power converter with burst mode transition shaping
First Claim
1. A resonant switching power circuit, comprising:
- a resonant circuit including at least one inductance and at least one capacitance for transferring energy to an output of the resonant switching power circuit;
a switching circuit coupled to the resonant circuit for transferring energy from an input voltage source to the resonant circuit; and
a control circuit for controlling the switching circuit, wherein the control circuit has a burst mode of operation in which a number of pulses are generated in bursts to provide the energy to the output of the resonant switching power circuit intermittently when energy demand at the output of the resonant switching power circuit is low, wherein the pulses within the bursts have a non-uniform pattern such that at least one transient at the start or end of the burst is reduced in amplitude, and wherein at least one ending pulse or at least one beginning pulse of the bursts has a predetermined duration that differs from another predetermined duration of pulses in a middle of the bursts.
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Accused Products
Abstract
A resonant switching power converter having burst mode transitioning operates during low or zero load conditions with reduced audible noise and component stresses, while improving efficiency. Pulse bursts are generated with a beginning and/or ending pulse duration that differs from mid-burst pulse durations, in order to reduce an amplitude of transients otherwise generated at the beginning and/or end of the bursts. Alternatively, the spacing between the pulses at the beginning and/or end of the bursts may differ from the spacing between the pulses in the middle of the bursts to reduce the transient(s). A number of pulses at the beginning and/or end of the burst can also be set with gradually varying durations, to further reduce component stress and audible vibration in a transformer that couples the resonant tank to the output of the converter.
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Citations
26 Claims
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1. A resonant switching power circuit, comprising:
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a resonant circuit including at least one inductance and at least one capacitance for transferring energy to an output of the resonant switching power circuit; a switching circuit coupled to the resonant circuit for transferring energy from an input voltage source to the resonant circuit; and a control circuit for controlling the switching circuit, wherein the control circuit has a burst mode of operation in which a number of pulses are generated in bursts to provide the energy to the output of the resonant switching power circuit intermittently when energy demand at the output of the resonant switching power circuit is low, wherein the pulses within the bursts have a non-uniform pattern such that at least one transient at the start or end of the burst is reduced in amplitude, and wherein at least one ending pulse or at least one beginning pulse of the bursts has a predetermined duration that differs from another predetermined duration of pulses in a middle of the bursts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of reducing transient amplitude during low power burst mode operation in a resonant switching power circuit, the method comprising:
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transferring energy to an output of the resonant switching power circuit from a resonant tank circuit; transferring energy from an input voltage source to the resonant circuit by operating a switching circuit; and operating the switching circuit in the burst mode, in which a number of pulses are generated in bursts to provide the energy to the output of the resonant switching power circuit intermittently when energy demand at the output of the resonant switching power circuit is low, wherein the pulses within the bursts have a non-uniform pattern such that at least one transient at the start or end of the burst is reduced in amplitude, and wherein at least one ending pulse or at least one beginning pulse of the bursts has a predetermined duration that differs from another predetermined duration of pulses in a middle of the bursts. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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- 21. An integrated circuit controller, integrated on a single die, for a controlling a resonant switching power converter, wherein the integrated circuit controller provides control signals to a switching circuit having a low-power burst mode, in which a number of pulses are generated in bursts when energy demand at an output of the resonant switching power converter is low, wherein the pulses within the bursts have a non-uniform pattern such that at least one transient at the start or end of the burst is reduced in amplitude, and wherein at least one ending pulse or at least one beginning pulse of the bursts has a predetermined duration that differs from another predetermined duration of pulses in a middle of the bursts.
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23. A resonant switching power circuit, comprising:
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a resonant circuit including at least one inductance and at least one capacitance for transferring energy to an output of the resonant switching power circuit; a switching circuit coupled to the resonant circuit for transferring energy from an input voltage source to the resonant circuit; and a control circuit for controlling the switching circuit, wherein the control circuit has a burst mode of operation in which a number of pulses are generated in bursts to provide the energy to the output of the resonant switching power circuit intermittently when energy demand at the output of the resonant switching power circuit is low, wherein the pulses within the bursts have a non-uniform pattern such that a transient at the end of the burst is reduced in amplitude, and wherein at least one ending pulse of the bursts has a predetermined duration that differs from another predetermined duration of pulses in a middle of the bursts.
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24. A resonant switching power circuit, comprising:
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a resonant circuit including at least one inductance and at least one capacitance for transferring energy to an output of the resonant switching power circuit; a switching circuit coupled to the resonant circuit for transferring energy from an input voltage source to the resonant circuit; and a control circuit for controlling the switching circuit, wherein the control circuit has a burst mode of operation in which a number of pulses are generated in bursts to provide the energy to the output of the resonant switching power circuit intermittently when energy demand at the output of the resonant switching power circuit is low, wherein the pulses within the bursts have a non-uniform pattern such that a transient at the start of the burst is reduced in amplitude, and wherein at least one beginning pulse of the bursts has a predetermined duration that differs from another predetermined duration of pulses in a middle of the bursts.
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25. A method of reducing transient amplitude during low power burst mode operation in a resonant switching power circuit, the method comprising:
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transferring energy to an output of the resonant switching power circuit from a resonant tank circuit; transferring energy from an input voltage source to the resonant circuit by operating a switching circuit; and operating the switching circuit in the burst mode, in which a number of pulses are generated in bursts to provide the energy to the output of the resonant switching power circuit intermittently when energy demand at the output of the resonant switching power circuit is low, wherein the pulses within the bursts have a non-uniform pattern such that a transient at the end of the burst is reduced in amplitude, and wherein at least one ending pulse of the bursts has a predetermined duration that differs from another predetermined duration of pulses in a middle of the bursts.
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26. A method of reducing transient amplitude during low power burst mode operation in a resonant switching power circuit, the method comprising:
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transferring energy to an output of the resonant switching power circuit from a resonant tank circuit; transferring energy from an input voltage source to the resonant circuit by operating a switching circuit; and operating the switching circuit in the burst mode, in which a number of pulses are generated in bursts to provide the energy to the output of the resonant switching power circuit intermittently when energy demand at the output of the resonant switching power circuit is low, wherein the pulses within the bursts have a non-uniform pattern such that a transient at the start of the burst is reduced in amplitude, and wherein at least one beginning pulse of the bursts has a predetermined duration that differs from another predetermined duration of pulses in a middle of the bursts.
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Specification