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公开(公告)号：DE69315391D1
公开(公告)日：1998-01-08
申请号：DE69315391
申请日：1993-06-22
Applicant: IBM
Inventor： NEWTON STEPHEN FRANCIS
Abstract: A regulator circuit is provided that allows recovery in a controlled manner in the shortest possible time from occasional power line disturbances such as momentary line dropouts or under voltage. The voltage used to control switching of the switch mode regulator follows the decrease in the output voltage during dropout, when switching of the switchmode regulator ceases. When the line returns, the voltage used to control the switching is allowed to ramp up to the desired value providing a controlled recovery.
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公开(公告)号：DE3780380D1
公开(公告)日：1992-08-20
申请号：DE3780380
申请日：1987-08-06
Applicant: IBM
Inventor： HULJAK ROBERT JOHN , NEWTON STEPHEN FRANCIS , WALLACE KENNETH ANDREW
Abstract: A DC to DC power converter having reduced switching loss for operation at high frequencies. As disclosed, a buck, or forward, converter includes a first FET (31) as the switching device in series with an inductor (33) and a second FET (32) as the flywheel device. At the common node to which the two FET's and the inductor are connected, there is sufficient capacitance that the FET's may be turned off without appreciable voltage change across the FET's. The value of the inductor (33) is chosen, with respect to the input and output voltages and frequencies of operation involved, to insure that the inductor current polarity reverses each cycle, raising the node voltage to the level of the input voltage, substantially eliminating turn-on losses of the first FET. Control circuitry (40) is provided for regulation of the power converter to control the peak-to-peak current in the inductor and to insure that at least a selected minimum value of the inductor current is present for each cycle of operation of the converter. An over-voltage protection circuit for the output of the converter is also provided.
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Patent Agency Ranking
公开(公告)号：DE69009285D1
公开(公告)日：1994-07-07
申请号：DE69009285
申请日：1990-03-07
Applicant: IBM
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公开(公告)号：DE69009285T2
公开(公告)日：1994-12-08
申请号：DE69009285
申请日：1990-03-07
Applicant: IBM
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公开(公告)号：DE3783684T2
公开(公告)日：1993-07-08
申请号：DE3783684
申请日：1987-08-06
Applicant: IBM
Inventor： NEWTON STEPHEN FRANCIS
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公开(公告)号：DE3783684D1
公开(公告)日：1993-03-04
申请号：DE3783684
申请日：1987-08-06
Applicant: IBM
Inventor： NEWTON STEPHEN FRANCIS
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公开(公告)号：DE3780380T2
公开(公告)日：1993-03-04
申请号：DE3780380
申请日：1987-08-06
Applicant: IBM
Inventor： HULJAK ROBERT JOHN , NEWTON STEPHEN FRANCIS , WALLACE KENNETH ANDREW
Abstract: A DC to DC power converter having reduced switching loss for operation at high frequencies. As disclosed, a buck, or forward, converter includes a first FET (31) as the switching device in series with an inductor (33) and a second FET (32) as the flywheel device. At the common node to which the two FET's and the inductor are connected, there is sufficient capacitance that the FET's may be turned off without appreciable voltage change across the FET's. The value of the inductor (33) is chosen, with respect to the input and output voltages and frequencies of operation involved, to insure that the inductor current polarity reverses each cycle, raising the node voltage to the level of the input voltage, substantially eliminating turn-on losses of the first FET. Control circuitry (40) is provided for regulation of the power converter to control the peak-to-peak current in the inductor and to insure that at least a selected minimum value of the inductor current is present for each cycle of operation of the converter. An over-voltage protection circuit for the output of the converter is also provided.
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