DC-to-DC Converter having reduced ripple without need for adjustments
First Claim
1. In a switching dc-to-dc converter having:
- inductance in series with a voltage source to form an input circuit and in series with a load to form an output circuit, energy transfer capacitance coupling one terminal of said input circuit to a corresponding terminal of said output circuit;
switching means for alternately connecting said capacitance to said input circuit in series to close a current path from the source back to the source and to said output circuit in series to close a current path from the load back to the load; and
means for achieving unbalanced current ripple reduction in said input and output circuits without any adjustments required in circuit components after assembly.
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Accused Products
Abstract
A switching dc-to-dc converter employs inductance in series with the source to form an input circuit, and in series with the load to form an output circuit. Suitable switching means alternately connects an energy transfer capacitance in series in the input circuit and in the output circuit. The inductance may be provided by separate windings coupled to form a transformer. To reduce switching ripple in the input circuit, or output circuit, the transformer may be provided with an imbalance of leakage inductance in the primary winding and the secondary winding. The imbalance may be inherent in the design of the transformer, or in the design of the transformer core. In the case of tightly coupled inductances in the transformer, an equivalent imbalance may be achieved by a separate, external inductor connected in series in the input circuit, or the output circuit. In the case of using a separate inductor in series with the source in the input circuit, or the load in the output circuit, the transformer may be replaced with a single inductance. Such a single inductance may be used alone, or with other inductance in series with the load circuit or the input circuit to provide a converter also with an imbalance in the switching current ripple.
67 Citations
13 Claims
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1. In a switching dc-to-dc converter having:
- inductance in series with a voltage source to form an input circuit and in series with a load to form an output circuit, energy transfer capacitance coupling one terminal of said input circuit to a corresponding terminal of said output circuit;
switching means for alternately connecting said capacitance to said input circuit in series to close a current path from the source back to the source and to said output circuit in series to close a current path from the load back to the load; and
means for achieving unbalanced current ripple reduction in said input and output circuits without any adjustments required in circuit components after assembly. - View Dependent Claims (2, 3, 4, 5, 6)
- inductance in series with a voltage source to form an input circuit and in series with a load to form an output circuit, energy transfer capacitance coupling one terminal of said input circuit to a corresponding terminal of said output circuit;
- 7. A switching dc-to-dc converter having a closed series circuit comprised of a first inductance, a source, a second inductance, a load and energy transfer capacitance, said converter further having a core coupling said first and second inductances, means for alternately placing said storage capacitance in a closed series circuit with said source and said load, and means for providing unbalanced current ripple reduction in said first and second inductances without any adjustments required in circuit components after assembly.
Specification