DC converter circuit with overshoot protection
First Claim
1. A DC-DC converter comprising:
- an input circuit that stores inductive energy and that includes a maximum of two switches configured to alternately release at least some of said stored inductive energy;
a transformer including a primary winding that communicates with said input circuit and a secondary winding; and
an output circuit that communicates with said secondary winding and that includes;
first and second output conductors;
a first diode that communicates with one end of said secondary winding and said first output conductor;
a second diode that communicates with said one end of said secondary winding and said second output conductor;
a third diode that communicates with an opposite end of said secondary winding and said first output conductor;
a fourth diode that communicates with said opposite end of said secondary winding and said second output conductor;
a first capacitor connected in parallel to said third diode; and
a second capacitor connected in parallel to said fourth diode;
wherein said switches and capacitors control a rate of buildup of voltage across at least one of said switches upon a release of at least some of said stored inductive energy when one of said switches is switched off.
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Accused Products
Abstract
A DC-DC converter comprises an input circuit that stores inductive energy that includes a first switch that releases the stored inductive energy. A transformer includes a primary winding that communicates with the input circuit and a secondary winding. An output circuit communicates with the secondary winding and that includes first and second output conductors and a first diode that communicates with one end of the secondary winding and the first output conductor. A second diode communicates with one end of the secondary winding and the second output conductor. A third diode communicates with an opposite end of the secondary winding and the first output conductor. A fourth diode communicates with an opposite end of the secondary winding and the second output conductor. A first capacitor is connected in parallel to the third diode. A second capacitor is connected in parallel to the fourth diode.
16 Citations
14 Claims
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1. A DC-DC converter comprising:
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an input circuit that stores inductive energy and that includes a maximum of two switches configured to alternately release at least some of said stored inductive energy; a transformer including a primary winding that communicates with said input circuit and a secondary winding; and an output circuit that communicates with said secondary winding and that includes; first and second output conductors; a first diode that communicates with one end of said secondary winding and said first output conductor; a second diode that communicates with said one end of said secondary winding and said second output conductor; a third diode that communicates with an opposite end of said secondary winding and said first output conductor; a fourth diode that communicates with said opposite end of said secondary winding and said second output conductor; a first capacitor connected in parallel to said third diode; and a second capacitor connected in parallel to said fourth diode; wherein said switches and capacitors control a rate of buildup of voltage across at least one of said switches upon a release of at least some of said stored inductive energy when one of said switches is switched off. - View Dependent Claims (2, 3, 4, 5, 6, 12)
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7. A DC-DC converter comprising:
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an input circuit that stores inductive energy and has switches consisting of a first switch that releases at least some of said stored inductive energy during an “
off”
period of said first switch, and a second switch that allows at least some of said inductive energy to be stored during a period beginning before and ending after the “
off”
period of the first switch;a transformer including a primary winding that communicates with said input circuit and a secondary winding; and an output circuit communicates with said secondary winding and that includes; first and second output conductors; a first diode that communicates with one end of said secondary winding and said first output conductor; a second diode that communicates with one end of said secondary winding and said second output conductor; a third diode that communicates with an opposite end of said secondary winding and said first output conductor; a fourth diode that communicates with an opposite end of said secondary winding and said second output conductor; a first capacitor connected in parallel to said fourth diode; and a second capacitor connected in parallel said third diode; wherein, when said first switch releases at some of said stored inductive energy, at least one of said first and second capacitors controls build-up of voltage across said first switch. - View Dependent Claims (8, 9, 10, 11)
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13. A DC-DC converter including an input circuit, a transformer, and an output circuit, the input circuit comprising:
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a pair of inductors, each having a first end connected with the other inductor and a first input conductor, a primary winding of said transformer connected between second ends of the inductors; and a pair of switches, each connected between a second input conductor and the second end of a corresponding one of the inductors; the output circuit comprising; first and second diodes connected with each other and between first and second output conductors, a first end of a secondary winding of the transformer connected between the first and second diodes, the first diode having an anode connected with a cathode of the second diode and a cathode connected with the first output conductor; third and fourth diodes connected with each other and between the output conductors, a second end of the secondary winding connected between the third and fourth diodes, the third diode having an anode connected with a cathode of the fourth diode and a cathode connected with the first output conductor; and first and second capacitors, each connected in parallel with a corresponding one of the third and fourth diodes; wherein the switches and capacitors are configured to control a rate of buildup of voltage across at least one of the switches upon a release of energy from the inductors when one of the switches is switched off. - View Dependent Claims (14)
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Specification