Resonant converter for achieving low common-mode noise, along with isolated power supply and method employing the same
First Claim
1. An isolated resonant converter for achieving reduced common mode noise, comprising:
- an input signal source for generating at least one square wave signal;
a resonant circuit driven by said at least one square wave signal for generating a primary alternating current (AC) voltage signal; and
a transformer having a primary winding coupled to said resonant circuit, said transformer driven by the primary AC voltage signal to generate at least one secondary AC voltage at a secondary winding, and an exit on a primary side of said transformer tied to ground and aligned with an adjacent exit on a secondary side of said transformer to minimize voltage differential across an interwinding capacitance of the transformer.
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Accused Products
Abstract
Embodiments are described for reducing common-mode current in electronic devices. In the various embodiments, a resonant converter is employed, for example in a power supply, and the resonant converter is driven by a DC input to generate an AC primary voltage on the primary windings of a power transformer. The DC input may be derived from an AC line voltage or a DC-to-DC converter. The AC primary voltage drives the primary winding of the transformer to generate an AC secondary voltage on at least one secondary winding of the transformer. The AC secondary voltage may then drive a rectifier, which in turn drives a low-pass filter to produce a DC output voltage. Phase-shift modulation is employed which, in conjunction with the resonant converter, applies a sinusoidal waveform to the primary of the transformer resulting in a reduced amount of common-mode current injected onto the secondary.
20 Citations
13 Claims
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1. An isolated resonant converter for achieving reduced common mode noise, comprising:
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an input signal source for generating at least one square wave signal; a resonant circuit driven by said at least one square wave signal for generating a primary alternating current (AC) voltage signal; and a transformer having a primary winding coupled to said resonant circuit, said transformer driven by the primary AC voltage signal to generate at least one secondary AC voltage at a secondary winding, and an exit on a primary side of said transformer tied to ground and aligned with an adjacent exit on a secondary side of said transformer to minimize voltage differential across an interwinding capacitance of the transformer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for reducing common mode noise in an electronic circuit, comprising:
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generating a plurality of square wave signals; passing said square wave signals into a resonant circuit that is operative to remove harmonics and high frequency content therefrom and convert said square wave signals into a primary alternating current (AC) voltage signal; applying said primary AC voltage to the primary winding of a transformer to yield a secondary AC voltage on at least one secondary winding of the transformer; and tying an exit on a primary side of said transformer to ground and aligning the exit with an adjacent exit on a secondary side of said transformer to minimize voltage differential across an interwinding capacitance of the transformer.
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Specification