US4353113A — Switch mode converters

Claim 1

Independent Claim 166 words

A magnetic amplifier having a main winding and at least one secondary reset winding, and a core composed of amorphous magnetic material, the amplifier being arranged to operate at a frequency greater than 20 KH z , wherein the amorphous magnetic material has the following characteristics measured at a frequency of 35 KH z : (i) a remanence ratio B R /B S greater than 0.7, where B R is the remanence and B S the magnetic flux at notional saturation; (ii) a post-saturation permeability ΔB/ΔH of less than 1000, when measured at a magnetic field strength of H=1 ampere turn per cm., where the flux B is measured in Tesla; (iii) a permeability ΔB/ΔH of greater than 50,000 when measured at magnetic flux B=0, using units of Tesla and ampere turns per cm.; and (iv) a coercivity such that the high frequency power loses of the core are less than 100 watts per kg of core material measured at a maximum flux of 0.4 Tesla.

Claim 2

Dependent Claim 166 words

A magnetic amplifier having a main winding and at least one secondary reset winding, and a core composed of amorphous magnetic material, the amplifier being arranged to operate at a frequency greater than 20 KH z , wherein the amorphous magnetic material has the following characteristics measured at a frequency of 35 KH z : (i) a remanence ratio B R /B S greater than 0.7, where B R is the remanence and B S the magnetic flux at notional saturation; (ii) a post-saturation permeability ΔB/ΔH of less than 1000, when measured at a magnetic field strength of H=1 ampere turn per cm., where the flux B is measured in Tesla; (iii) a permeability ΔB/ΔH of greater than 50,000 when measured at magnetic flux B=0, using units of Tesla and ampere turns per cm.; and (iv) a coercivity such that the high frequency power loses of the core are less than 100 watts per kg of core material measured at a maximum flux of 0.4 Tesla.

Claim 3

Dependent Claim 17 words

A magnetic amplifier as claimed in claim 1, wherein B R /B S is greater than 0.9.

Claim 4

Dependent Claim 20 words

A magnetic amplifier as claimed in claim 1, where ΔB/ΔH is less than 700 at H=1 ampere turns per cm.

Claim 5

Dependent Claim 16 words

A magnetic amplifier as claimed in claim 1, wherein ΔB/ΔH is greater than 100,000 at B=0.

Claim 6

Dependent Claim 16 words

A magnetic amplifier as claimed in claim 1, wherein ΔB/ΔH is greater than 500,000 at B=0.

Claim 7

Dependent Claim 106 words

A switch mode converter which includes a high frequency transformer having a primary winding in a primary circuit arranged to be energized by direct current and having means for switching the direct current at a frequency greater than 20 KH z , and at least one secondary winding included in a secondary winding circuit having means for smoothing and integrating the output of the secondary winding to provide a relatively smooth d.c. voltage and current at output terminals, wherein the primary circuit includes a magnetic amplifier arranged to regulate the output of the secondary circuit by pulse width modulation of the current in the primary circuit.

Claim 8

Dependent Claim 106 words

A switch mode converter which includes a high frequency transformer having a primary winding in a primary circuit arranged to be energized by direct current and having means for switching the direct current at a frequency greater than 20 KH z , and at least one secondary winding included in a secondary winding circuit having means for smoothing and integrating the output of the secondary winding to provide a relatively smooth d.c. voltage and current at output terminals, wherein the primary circuit includes a magnetic amplifier arranged to regulate the output of the secondary circuit by pulse width modulation of the current in the primary circuit.

Claim 9

Dependent Claim 106 words

A switch mode converter which includes a high frequency transformer having a primary winding in a primary circuit arranged to be energized by direct current and having means for switching the direct current at a frequency greater than 20 KH z , and at least one secondary winding included in a secondary winding circuit having means for smoothing and integrating the output of the secondary winding to provide a relatively smooth d.c. voltage and current at output terminals, wherein the secondary circuit includes a magnetic amplifier arranged to regulate the output of the secondary circuit by pulse width modulation of the output of the secondary winding.

Claim 10

Dependent Claim 106 words

A switch mode converter which includes a high frequency transformer having a primary winding in a primary circuit arranged to be energized by direct current and having means for switching the direct current at a frequency greater than 20 KH z , and at least one secondary winding included in a secondary winding circuit having means for smoothing and integrating the output of the secondary winding to provide a relatively smooth d.c. voltage and current at output terminals, wherein the secondary circuit includes a magnetic amplifier arranged to regulate the output of the secondary circuit by pulse width modulation of the output of the secondary winding.

Claim 11

Dependent Claim 39 words

A switch mode converter as claimed in claims 6 or 7, wherein under normal operating conditions the converter is arranged to operate at maximum pulse width with saturation of the core of the magnetic amplifier during each "on" period.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1985-10-04	1986-04-05	1986-10-05	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1989-10-04	1990-04-05	1990-10-05	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1993-10-04	1994-04-05	1994-10-05	$7700.00	Window Closed / Lapsed

Switch mode converters

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