Isolated DC-to-DC converter
First Claim
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1. An isolated direct-current-to-direct-current (DC-to-DC) converter, comprising:
- a class-D amplifier configured to be driven by an alternating current (AC) input voltage and a DC input voltage, the class-D amplifier thus configured to generate an AC primary voltage;
a transformer having a primary winding configured to be driven by the AC primary voltage, the transformer thus configured to generate an AC secondary voltage at a secondary winding;
a rectifier configured to be driven by the AC secondary voltage, the rectifier thus configured to generate a rectified voltage; and
a low-pass filter configured to be driven by the rectified voltage, the low-pass filter thus configured to produce a DC output voltage.
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Abstract
An isolated direct-current to direct-current (DC-to-DC) converter and associated method are provided which employ a class-D amplifier. An alternating current (AC) input voltage and a DC input voltage drive the class-D amplifier to produce an AC primary voltage. The AC primary voltage then drives a primary winding of a transformer, thereby generating an AC secondary voltage at a secondary winding of the transformer. The AC secondary voltage then drives a rectifier, yielding a rectified voltage. A low-pass filter is then accepts the rectified voltage to produce a DC output voltage.
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Citations
34 Claims
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1. An isolated direct-current-to-direct-current (DC-to-DC) converter, comprising:
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a class-D amplifier configured to be driven by an alternating current (AC) input voltage and a DC input voltage, the class-D amplifier thus configured to generate an AC primary voltage;
a transformer having a primary winding configured to be driven by the AC primary voltage, the transformer thus configured to generate an AC secondary voltage at a secondary winding;
a rectifier configured to be driven by the AC secondary voltage, the rectifier thus configured to generate a rectified voltage; and
a low-pass filter configured to be driven by the rectified voltage, the low-pass filter thus configured to produce a DC output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An electronic circuit for converting a first direct-current (DC) voltage to a second DC voltage, comprising:
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means for generating a pulse-width-modulated voltage whose pulse width varies with an alternating current (AC) input voltage;
means for switching the first DC voltage based on the state of the pulse-width-modulated voltage to yield a switched DC voltage;
means for low-pass-filtering the switched DC voltage to yield a primary AC voltage;
means for applying the primary AC voltage to the primary winding of a transformer to yield a secondary AC voltage at a secondary winding of the transformer;
means for rectifying the secondary AC voltage to yield a rectified voltage; and
means for low-pass-filtering the rectified voltage to yield the second DC voltage. - View Dependent Claims (19, 20, 21)
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22. A method for converting a first direct-current (DC) voltage to a second DC voltage, comprising:
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generating a pulse-width-modulated voltage whose pulse width varies with an alternating current (AC) input voltage;
switching the first DC voltage based on the state of the pulse-width-modulated voltage to yield a switched DC voltage;
low-pass-filtering the switched DC voltage to yield a primary AC voltage;
applying the primary AC voltage to the primary winding of a transformer to yield a secondary AC voltage at a secondary winding of the transformer;
rectifying the secondary AC voltage to yield a rectified voltage; and
low-pass-filtering the rectified voltage to yield the second DC voltage. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification