Series resonant DC-DC converter
First Claim
1. A series resonant DC-DC converter, comprising:
- a switching stage operable to control a switch to turn on and off according to a predetermined switching cycle, where the switching cycle comprises a first interval that turns on the switch and a second interval that turns off the switch prior to a next switching cycle of another switch;
a series resonant stage coupled to the switching stage and comprising a capacitor and an inductor connected in series, where the inductor comprises a first inductor and a second inductor that are magnetically coupled to each other;
a transformer stage comprising a primary winding and a secondary winding, the primary winding connected in series with the series resonant stage;
a clamping stage coupled to the inductor and placed between the series resonant stage and the transformer stage, the clamping stage operable to clamp an excess voltage, where the excess voltage is a predetermined voltage drop produced by the second inductor; and
,an output stage coupled to the secondary winding of the transformer stage and configured to power a load.
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Accused Products
Abstract
A series resonant Dc-DC converter powers an audio amplifier as a load. The series resonant DC-DC converter may include a power input stage, a switching stage, a series resonant stage, a transformer stage and a power output stage. The series resonant DC-DC converter further may include a clamping stage and a leakage inductance canceling stage. The clamping stage may operate to clamp an excess voltage generated at least by a leakage inductance and a parasitic capacitance. The leakage inductance canceling stage may operate to generate a voltage drop corresponding to a voltage drop generated by the leakage inductance. The generated voltage drop may be subject to clamping. The clamping stage may operate under all load conditions without any influence of the leakage inductance. As a result, the series resonant converter may achieve improved load regulation.
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Citations
33 Claims
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1. A series resonant DC-DC converter, comprising:
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a switching stage operable to control a switch to turn on and off according to a predetermined switching cycle, where the switching cycle comprises a first interval that turns on the switch and a second interval that turns off the switch prior to a next switching cycle of another switch; a series resonant stage coupled to the switching stage and comprising a capacitor and an inductor connected in series, where the inductor comprises a first inductor and a second inductor that are magnetically coupled to each other; a transformer stage comprising a primary winding and a secondary winding, the primary winding connected in series with the series resonant stage; a clamping stage coupled to the inductor and placed between the series resonant stage and the transformer stage, the clamping stage operable to clamp an excess voltage, where the excess voltage is a predetermined voltage drop produced by the second inductor; and
,an output stage coupled to the secondary winding of the transformer stage and configured to power a load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A series resonant DC-DC converter, comprising:
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a switching stage operable to control a switch to turn on and off according to a predetermined switching cycle, where the switching cycle comprises a first interval that turns on the switch and a second interval that turns off the switch prior to a next switching cycle of another switch; a series resonant stage coupled to the switching stage and comprising a capacitor and an inductor connected in series; a transformer stage comprising a primary winding and a secondary winding, the primary winding connected in series with the series resonant stage; a clamping stage placed between the switching stage and the transformer stage, the clamping stage operable to clamp an excess voltage; an output stage coupled to the secondary winding of the transformer stage and configured to power a load; and a leakage inductance cancellation block operable to produce a predetermined voltage for clamping by the clamping stage, the voltage corresponding to a voltage drop of a leakage inductance of the transformer stage. - View Dependent Claims (13, 14, 15)
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16. A series resonant DC-DC converter for powering an audio amplifier, comprising:
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a transformer comprising a primary winding and a secondary winding, where a leakage inductance and a parasitic capacitance develop in the transformer; a series resonant circuit comprising a capacitor and an inductor, the inductor comprising a winding operable with a voltage drop that corresponds to a voltage drop of the leakage inductance; and a diode circuit coupled to the inductor and disposed between the series resonant circuit and the transformer, the diode circuit operable to clamp an excess voltage generated at least in response to the leakage inductance and the parasitic capacitance, where the voltage drop of the inductor is clamped by the diode circuit. - View Dependent Claims (17, 18, 19, 24, 25, 26, 27, 28, 29)
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20. A series resonant DC-DC converter for powering an audio amplifier, comprising:
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a transformer comprising a primary winding and a secondary winding, where a leakage inductance and a parasitic capacitance develop in the transformer; a series resonant circuit comprising a capacitor and a first inductor, the first inductor comprising a winding operable with a voltage drop that corresponds to a voltage drop of the leakage inductance, where the winding comprises a first winding and a second winding, and the second winding is disposed between the first winding and a second inductor representing the leakage inductance; and a diode circuit disposed between a switching device and the transformer, the diode circuit operable to clamp an excess voltage generated at least in response to the leakage inductance and the parasitic capacitance, where the voltage drop of the first inductor is clamped by the diode circuit. - View Dependent Claims (21, 22, 23)
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30. A method for powering an audio amplifier, comprising:
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supplying a driving voltage to turn on a switching device during a switching cycle where the driving voltage becomes zero value at the end of the switching cycle and prior to a start of a next switching cycle; turning off the switching device at a zero current and turning on the switching device at a zero voltage; transferring power from a primary side to a secondary side of a transformer; generating with an inductor positioned on the primary side of the transformer a voltage drop that corresponds to a voltage drop of a leakage inductance of the transformer; clamping the generated voltage drop; and supplying the transferred power with the clamped voltage drop to an audio amplifier. - View Dependent Claims (31, 32, 33)
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Specification