Redirected sequential flyback synchronous rectifier
First Claim
1. A computer system comprising:
- a memory having a set of program instructions stored therein;
a plurality of electrically-operated components including a first component coupled to receive power from a first power source and a second component coupled to receive power from a second power source;
a regulator circuit operable to provide the first power source and the second power source, the regulator circuit including;
a first inductive element coupled in series with a first switch to turn current flow through the first inductive element ON and OFF;
a second inductive element having a first end coupled to produce the first power source, and magnetically coupled with the first inductive element;
a third inductive element magnetically coupled with the first inductive element, the third inductive element having greater inductive capacity than the second inductive element, a first end coupled to produce the second power source, and a second switch to turn current flow through the third inductive element ON and OFF;
a saturable reactor coupled to control current flow from the third inductive element to the second switch; and
a control circuit coupled to control the ON and OFF duty cycle of the second switch such that when the current is allowed to discharge through the first inductive element, current flows through the third inductive element subsequent to current flow in the second inductive element.
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Accused Products
Abstract
A switching flyback regulator circuit for providing a plurality of regulated DC voltage supplies, wherein one of the regulator circuits includes a saturable reactor for regulating one of the output voltages. The flyback regulator circuit includes a primary inductive element coupled to a first switch to turn charging current flow through the primary inductive element ON and OFF, a first secondary inductive element having a first end coupled to supply a first power source and magnetically coupled with the primary inductive element, and a second secondary inductive element magnetically coupled with the primary inductive element. The second secondary inductive element has a first end coupled to produce the second power source and a second end coupled in series with the saturable reactor and a second switch to control current flow through the second secondary inductive element. A control circuit is coupled to control the ON and OFF duty cycle of the second switch such that when the first switch is operated to allow the primary inductive element to discharge, current flows through the first secondary inductive element before current flows in the second secondary inductive element. A reset current signal controls current flow through the saturable reactor.
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Citations
21 Claims
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1. A computer system comprising:
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a memory having a set of program instructions stored therein; a plurality of electrically-operated components including a first component coupled to receive power from a first power source and a second component coupled to receive power from a second power source; a regulator circuit operable to provide the first power source and the second power source, the regulator circuit including; a first inductive element coupled in series with a first switch to turn current flow through the first inductive element ON and OFF; a second inductive element having a first end coupled to produce the first power source, and magnetically coupled with the first inductive element; a third inductive element magnetically coupled with the first inductive element, the third inductive element having greater inductive capacity than the second inductive element, a first end coupled to produce the second power source, and a second switch to turn current flow through the third inductive element ON and OFF; a saturable reactor coupled to control current flow from the third inductive element to the second switch; and a control circuit coupled to control the ON and OFF duty cycle of the second switch such that when the current is allowed to discharge through the first inductive element, current flows through the third inductive element subsequent to current flow in the second inductive element. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A regulator circuit for providing a plurality of regulated DC voltage power supplies, the regulator circuit comprising:
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a first inductive element coupled in series with a first switch to turn charging current flow through the first inductive element ON and OFF; a second inductive element having a first end coupled to produce the first power source, and magnetically coupled with the first inductive element; a third inductive element magnetically coupled with the first inductive element, the third inductive element having greater inductive capacity than the second inductive element, a first end coupled to produce the second power source, and a second switch to turn current flow through the third inductive element ON and OFF; a saturable reactor coupled to control current flow from the third inductive element to the second switch; and a control circuit coupled to control the ON and OFF duty cycle of the second switch such that when the first switch is operated to allow the first inductive element to discharge, current flows through the second inductive element before current flows in the third inductive element. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for generating a plurality of regulated voltage supplies utilizing a flyback regulator, the flyback regulator including a primary inductive element magnetically coupled to a plurality of secondary inductive elements wherein a first secondary inductive element is coupled to a first switch and a saturable reactor, the first secondary inductive element having a greater inductive capacity than the other secondary inductive elements, the method comprising:
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opening the first switch coupled with the first secondary inductive element; charging the primary inductive element with a charge current over a controlled time period; opening a second switch coupled to the primary inductive element, thereby reversing polarity of the inductive elements and causing magnetizing current to flow through a second secondary inductive element; determining when to close the first switch subsequent to opening the second switch to allow current to flow through the first secondary inductive element; and supplying a controlled amount of reset current to the saturable reactor to regulate one of the voltage supplies. - View Dependent Claims (15, 16, 17, 18)
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19. A method for changing the output sequence of a regulator circuit utilizing a flyback regulator to generate a plurality of DC voltage supplies, the flyback regulator including a primary inductive element magnetically coupled to at least two secondary inductive elements wherein a first secondary inductive element is coupled to a first switch and a saturable reactor, the method comprising:
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opening the first switch coupled to the first secondary inductive element; charging the primary inductive element with a charge current over a controlled time period; discharging the current stored in the primary inductive element by opening a second switch coupled to the primary inductive element; generating a ramped voltage signal having a negative slope; generating an error signal indicative of a first voltage output by a DC voltage supply circuit including the first secondary inductive element; generating a driver signal based on the error signal and the ramped voltage signal, the driver signal being set to close the first switch when the ramped voltage is less than or equal to the error signal and to open the first switch when the primary inductor begins charging; and supplying a controlled amount of reset current to the saturable reactor to regulate the first voltage output. - View Dependent Claims (20, 21)
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Specification