In the preface of his book Switching Power Converters, Wood introduces the concept of a unified converter theory. There he states: “Most traditional views of the field have seemed somewhat disjointed; converters were largely regarded as related only because they all use semiconductor switches and have certain topological similarities. . . . the view expounded herein (is that) switching power converters are related by function and behavior; their basic characteristics do not in any way depend on the types of switches used, nor on the applications to which they are put, nor on the topologies in which they are realized.”. According to this unified theory, any power electronic converter can be viewed as a matrix of switches which connects its input nodes to its output nodes. These nodes may be either DC or AC, and either inductive or capacitive; and the power flow may be in either direction. Two obvious restrictions are enforced by some basic laws of electricity.
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