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US5111373A Expired / Lapsed US ⏱️ 0.0 years remaining

Pwm-controlled power supply including choke coil with 3-windings

Assignee: Toshiba Mitsubishi Electric Industrial Systems Corp
•
Filing: 1991-01-29
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Granted: 1992-05-05
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Expires: 2011-01-29
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Abstract

Abstract In a PWM control type power supply apparatus, a modulation (high frequency) signal component is eliminated not only from AC input, but also AC output. The PWM control type power supply apparatus includes: an AC-to-DC converting unit capable of supplying a first AC voltage having a source frequency from a pair of output terminals, for converting the first AC voltage to obtain a positive DC (direct current) voltage from a positive half cycle and a negative DC voltage from a negative half cycle of the first AC voltage appearing at one output terminal with a common voltage appearing at another output terminal; a DC-to-AC inverter unit including a pair of first and second switching elements, and a PWM (pulse width modulation) controller for controlling switching operations of the first and second switching elements in a PWM control mode so as to invert the positive and negative DC voltage into a second AC voltage having a modulation frequency higher than the source frequency the second AC voltage being applied to a load; and a choke coil having a single core and first, second and third coil windings wound on the single core for magnetically coupling the coil windings with each other, the first and second coil windings being interposed between the AC power source and the AC-to-DC converting means, and also the third coil winding being interposed between the DC-to-AC inverter unit and the load.

Inventors

  • 👤 Shigetoshi Higaki

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 14:43
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/453; H02M5/458; H02M1/00; H02M1/12

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 233 words
A power supply apparatus comprising: AC-to-DC converting means coupled to an AC (alternating current) power source capable of supplying a first AC voltage having a source frequency from a pair of output terminals, for converting said first AC voltage to obtain a positive DC (direct current) voltage from a positive half cycle of said first AC voltage appearing at one output terminal of said output terminals and also a negative DC voltage from a negative half cycle of said first AC voltage appearing at said one output terminal with a common voltage appearing at another output terminal of said output terminals; DC-to-AC inverter means including a pair of first and second switching elements and also a PWM (pulse width modulation) controller for controlling switching operations of said first and second switching elements in a PWM control mode so as to invert said positive and negative DC voltages into a second AC voltage having a modulation frequency higher than said source frequency, said second AC voltage being applied to a load; and, choke coil means having a single core and first, second and third coil windings wound on said single core for magnetically coupling said coil windings with each other, said first and second coil windings being interposed between said AC power source and said AC-to-DC converting means, and also said third coil winding being interposed between said DC-to-AC inverter means and said load.
Claim 2
Dependent Claim 233 words
A power supply apparatus comprising: AC-to-DC converting means coupled to an AC (alternating current) power source capable of supplying a first AC voltage having a source frequency from a pair of output terminals, for converting said first AC voltage to obtain a positive DC (direct current) voltage from a positive half cycle of said first AC voltage appearing at one output terminal of said output terminals and also a negative DC voltage from a negative half cycle of said first AC voltage appearing at said one output terminal with a common voltage appearing at another output terminal of said output terminals; DC-to-AC inverter means including a pair of first and second switching elements and also a PWM (pulse width modulation) controller for controlling switching operations of said first and second switching elements in a PWM control mode so as to invert said positive and negative DC voltages into a second AC voltage having a modulation frequency higher than said source frequency, said second AC voltage being applied to a load; and, choke coil means having a single core and first, second and third coil windings wound on said single core for magnetically coupling said coil windings with each other, said first and second coil windings being interposed between said AC power source and said AC-to-DC converting means, and also said third coil winding being interposed between said DC-to-AC inverter means and said load.
Claim 3
Dependent Claim 51 words
A power supply apparatus as claimed in claim 1, further comprising: boosting chopper means interposed between said first and second coil windings and said AC-to-DC converter means, for boosting said first AC voltage derived from said AC power source to obtain a third AC voltage higher than said first AC voltage.
Claim 4
Dependent Claim 46 words
A power supply apparatus as claimed in claim 2, wherein said boosting chopper means includes a pair of third and fourth switching elements, and also a boosting chopper PWM controller for controlling chopping operations of said third and fourth switching elements in the PWM control mode.
Claim 5
Dependent Claim 47 words
A power supply apparatus as claimed in claim 1, wherein said choke coil means includes a ferrite core and three coil windings wound on said ferrite core in such a manner that an ampere turn of each of said three coil windings is equal to each other.

References Cited (Backward Citations)

US4849950A Cited
US4750102A Cited
US5017800A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-05-05 1995-11-04 1996-05-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-05-05 1999-11-04 2000-05-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-05-05 2003-11-04 2004-05-05 $7700.00 Window Closed / Lapsed

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