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A compact stacked power module including a positive direct-current-bus-voltage plate having a positive-plate surface and a negative direct-current-bus-voltage plate having a negative-plate surface. The compact stacked power module also includes an alternating-current output plate having opposing fir

A compact stacked power module including a positive direct-current-bus-voltage plate having a positive-plate surface and a negative direct-current-bus-voltage plate having a negative-plate surface. The compact stacked power module also includes an alternating-current output plate having opposing first and second output-plate surfaces, a first semiconductor switch contacting the negative-plate surface and the first output-plate surface, and a second semiconductor switch contacting the positive-plate surface and the second output-plate surface. The compact stacked power module further includes a capacitor contacting the negative-plate surface and the positive-plate surface, wherein the capacitor is electrically in parallel with the first and second semiconductor switches.

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1. A compact stacked power module including positive and negative direct-current-bus-voltage plates having respective positive and negative plate surfaces, the module comprising: an alternating-current output plate having a first output-plate surface opposite a second output-plate surface;a first se

1. A compact stacked power module including positive and negative direct-current-bus-voltage plates having respective positive and negative plate surfaces, the module comprising: an alternating-current output plate having a first output-plate surface opposite a second output-plate surface;a first semiconductor switch contacting the negative-plate surface and the first output-plate surface;a second semiconductor switch contacting the positive-plate surface and the second output-plate surface; anda capacitor (i) contacting the negative and positive plate surfaces and (ii) connected in parallel with the first and second semiconductor switches. 2. The compact stacked power module of claim 1, wherein at least one of the plates comprises a groove adjacent the capacitor to relieve forces in the module before the forces reach the capacitor in operation of the compact stacked power module. 3. The compact stacked power module of claim 1, wherein the positive direct-current-bus-voltage plate comprises a first material, primarily, and adjacent the capacitor, a second material softer than the first material to relieve forces developing in the module before the forces reach the capacitor in operation of the compact stacked power module. 4. The compact stacked power module of claim 3, wherein the first material is copper and the second material is a copper alloy. 5. The compact stacked power module of claim 3, wherein the second material is selected from a group consisting of gold, mercury, and a copper alloy. 6. The compact stacked power module of claim 1, wherein the capacitor is a leaded capacitor, connected by lead to the positive direct-current-bus-voltage plate to relieve forces developing in the module before the forces reach the capacitor in operation of the compact stacked power module. 7. The compact stacked power module of claim 1, wherein the capacitor is a first capacitor and the compact stacked power module comprises a second capacitor contacting the second negative-plate surface and the positive-plate surface and being electrically in parallel with the first and second semiconductor switches. 8. The compact stacked power module of claim 1, wherein the positive direct-current-bus-voltage plate, the negative direct-current-bus-voltage plate, and the alternating-current output plate are copper bus plates. 9. The compact stacked power module of claim 1, wherein each of the first and second semiconductor switches comprises an insulated-gate bipolar transistor or a metal-oxide-semiconductor field-effect transistor. 10. The compact stacked power module of claim 1, wherein each of said surfaces is substantially planar. 11. The compact stacked power module of claim 1, wherein: the alternating-current output plate is a first alternating-current output plate;the capacitor is a first capacitor; andthe compact stacked power module further comprises:a second alternating-current output plate comprising a third output-plate surface opposite a fourth output-plate surface;a second capacitor extending between the negative-plate surface and the positive-plate surface;a third semiconductor switch contacting the negative-plate surface and the third output-plate surface; anda fourth semiconductor switch contacting the positive-plate surface and the fourth output-plate surface. 12. The compact stacked power module of claim 1, wherein the first semiconductor switch comprises a built-in body diode. 13. The compact stacked power module of claim 1, further comprising a diode connected in parallel with the first semiconductor switch between the positive-plate surface and the first output-plate surface. 14. The compact stacked power module of claim 1, wherein each of said plates has a width that is substantially greater than a thickness of the plate and a length that is substantially greater than the thickness of the plate. 15. The compact stacked power module of claim 14, wherein the width of each plate is at least ten times the width of the plate and the length is at least ten times the width of the plate. 16. The compact stacked power module of claim 1, wherein the capacitor is a first capacitor and the compact stacked power module comprises a second capacitor contacting the second negative-plate surface and the positive-plate surface electrically in parallel with the first and second semiconductor switches. 17. A method, for making a compact stacked power module, comprising: arranging a capacitor, a positive direct-current-bus-voltage plate, and a negative direct-current-bus-voltage plate, wherein the capacitor is positioned between the positive direct-current-bus-voltage and the negative direct-current-bus-voltage plates, in contact with a positive-plate surface of the positive direct-current-bus-voltage plate and a negative-plate surface of the negative direct-current-bus-voltage plate; andarranging an alternating-current output plate, a first semiconductor switch, and a second semiconductor switch between the positive and negative direct-current-bus-voltage plates, wherein:the first semiconductor switch contacts the negative-plate surface and a first output-plate surface of the alternating-current output plate; andthe second semiconductor switch contacts the positive-plate surface and a second output-plate surface of the alternating-current output plate. 18. The method of claim 17, wherein each of said plates has a width that is substantially greater than a thickness of the plate and a length that is substantially greater than the thickness of the plate. 19. A compact stacked power module comprising: a positive direct-current-bus-voltage plate;a negative direct-current-bus-voltage plate;a capacitor extending between and in contact with the positive and negative direct-current-bus-voltage plates;two semiconductor switches arranged electrically in parallel with the capacitor; anda strain-relief feature selected from a group consisting of:one of the direct-current-bus-voltage plates comprising a groove adjacent the capacitor;one of the direct-current-bus-voltage plates comprising a first material primarily and a second material, softer than the first material, adjacent the capacitor; andthe capacitor being a leaded capacitor, connected to at least one of the direct-current-bus-voltage plates by one or more leads. 20. The compact stacked power module of claim 19, wherein each of said plates has a width that is substantially greater than a thickness of the plate and a length that is substantially greater than the thickness of the plate.