Patent ID: 8705257
Filing Date: 2014-04-22
Classification: H01L,H02M,H05K

Abstract:
1. A switching module, comprising: a series-connected unit of a low-potential-side flowing restriction element and a high-potential-side flowing restriction element, the low-potential-side flowing restriction element having an opening and closing function of opening and closing a flowing path of current, and the high-potential-side flowing restriction element having at least one of a rectifying function of restricting the direction in which current flows and the opening and closing function; and a snubber circuit connected to the series-connected unit in parallel, wherein a low-potential-side wiring line connecting between the low-potential-side flowing restriction element and the snubber circuit, a high-potential-side wiring line connecting between the high-potential-side flowing restriction element and the snubber circuit, an intermediate wiring line connecting between the low-potential-side flowing restriction element and the high-potential-side flowing restriction element, the low-potential-side flowing restriction element, the high-potential-side flowing restriction element, and the snubber circuit are formed substantially integrally with each other by using a multilayer board, a low-potential-side semiconductor chip configuring the low-potential-side flowing restriction element and a high-potential-side semiconductor chip configuring the high-potential-side flowing restriction element are arranged so as to be opposed to each other, the low-potential-side wiring line is formed on a side of one of a pair of opposed surfaces of the low-potential-side semiconductor chip, the surfaces being adjacent to another surface of the low-potential-side semiconductor chip, the high potential-side wiring line is formed on a side of one of a pair of opposed surfaces of the high-potential-side semiconductor chip, the surfaces being adjacent to another surface of the high-potential-side semiconductor chip, the another surface of the low-potential-side semiconductor chip and the another surface of the high-potential-side semiconductor chip being opposed to each other, the intermediate wiring line is formed on a side of the other of the pair of the surfaces of the low-potential-side semiconductor chip and on a side of the other of the pair of the surfaces of the high-potential-side semiconductor chip, the low-potential-side semiconductor chip configuring the low-potential-side flowing restriction element and the high-potential-side semiconductor chip configuring the high-potential-side flowing restriction element are formed in the same layer of the multilayer board, a first current path between the snubber circuit and the high-potential-side semiconductor chip is opposed to a second current path between the high-potential-side semiconductor chip and the intermediate wiring line, and the directions in which currents flow in the first and second current paths are opposite to each other, and a third current path between the snubber circuit and the low-potential-side semiconductor chip is opposed to a fourth current path between the low-potential-side semiconductor chip and the intermediate wiring line, and the directions in which currents flow the third and fourth current paths are opposite to each other.