Resonant power converter
First Claim
1. A resonant power converter having a primary side and a secondary side, comprising:
- an input power source provided in the primary side;
switching means connected to the input power source;
a resonant transformer having a primary coil and a second coil; and
a resonance capacitor which is provided in the secondary side and is connected in parallel to the secondary coil of the resonant transformer so that series resonance occurs in a current flowing through the secondary side of the power converter throughout a switching period.
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Accused Products
Abstract
A resonant power converter includes a DC power source 1, a pair of MOS-PETs 1 and 2 which are connected in series to the DC power source, a transformer Tr1 which is arranged at the subsequent stage of the MOS-FETs 1 and 2 and includes a primary coil and a secondary coil, a capacitor C4 is arranged in parallel with the secondary coil of the transformer Tr1 so that series resonance occurs between the leakage inductance of the transformer Tr1 and the capacitor C4. A current doubler rectifier circuit may be arranged in the subsequent stage of the capacitor C4. Further, a pair of switching elements for synchronous rectification may be provided in the subsequent stage of the capacitor C4 so that these switching elements are driven by drive signals responsive to a voltage generated across the resonance capacitor C4.
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Citations
16 Claims
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1. A resonant power converter having a primary side and a secondary side, comprising:
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an input power source provided in the primary side;
switching means connected to the input power source;
a resonant transformer having a primary coil and a second coil; and
a resonance capacitor which is provided in the secondary side and is connected in parallel to the secondary coil of the resonant transformer so that series resonance occurs in a current flowing through the secondary side of the power converter throughout a switching period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A resonant power converter having a primary side and a secondary side, comprising:
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an input power source provided in the primary side;
switching means connected to the input power source;
a resonant transformer having a primary coil and a second coil;
a resonance capacitor which is provided in the secondary side and is connected in parallel to the secondary coil of the resonant transformer so that series resonance occurs in a current flowing through the secondary side of tie power converter; and
a current doubler circuit for making the current flowing through the secondary side double, said current doubler circuit being provided in the secondary side and coupled to the both ends of the resonance capacitor;
the current doubler circuit including a pair of circuits each having a rectifying means and an inductance, in which these circuits are connected in parallel with each other so that a junction between the rectifying means and inductance of one circuit and a junction between the rectifying means and inductance of the other circuit are respectively connected to the both ends of the secondary coil.
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15. A resonant power converter having a primary side and a secondary side, comprising:
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an input power source provided in the primary side;
switching means connected to the input power source;
a resonant transformer having a primary coil and a second coil; and
a resonance capacitor which is provided in the secondary side and is connected in parallel to the secondary coil of the resonant transformer so that series resonance occurs in a current flowing through the secondary side of the power converter;
said switching means including a pair of switching elements for synchronous rectification, the switching elements being driven by drive signals responsive to the voltage generated across the resonance capacitor and having a sinusoidal waveform; and
a pair of auxiliary coils connected to both ends of the secondary coil, respectively, the drive signals being obtained from the opposite ends of the respective auxiliary coils which are not connected to the secondary coil.
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16. A resonant power converter having a primary side and a secondary side, comprising:
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an input power source provided in the side;
switching means connected to the input power source;
a resonant transformer having a primary coil and a second coil; and
a resonance capacitor which is provided in the secondary side and is connected in parallel to the secondary coil of the resonant transformer so that series resonance occurs in a current flowing through the secondary side of the power converter;
said switching means including a pair of switching elements for synchronous rectification, the switching elements are driven by drive signals;
waveform processing means for producing pulse waves by processing and shaping the voltage drive signals to be supplied to the switching elements;
the waveform processing means comparing the voltage drive signals in the form of sinusoidal wave with a predetermined reference value to produce plus signals.
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Specification