Title: Heat sink mounting for controlled rectifiers

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Abstract: One layer of three heat sinks for conducting alternating current and a second layer of two heat sinks for conducting direct current sandwich twelve controlled rectifiers which are electrically arranged to provide a pair of gated rectifier bridge networks for changing from a current of one frequency to a current of another frequency. Six rod-like bolts are removably secured within threaded openings of certain heat sinks and pass through openings within other heat sinks and assist together with locking nuts in compressing the sandwiched assembly. Three of the bolts are electrically insulated from the direct current heat sinks for supplying alternating current to the rectifying devices through the alternating current heat sinks while two of the bolts are electrically insulated from the alternating current heat sinks for conducting direct current to the rectifying devices through the direct current heat sinks. An alternative embodiment employs two layers each comprising one heat sink for conducting direct current and a third layer of three heat sinks for conducting alternating current for sandwiching two layers of controlled rectifiers each including six rectifying devices. Three rod-like bolts are removably secured within threaded openings of one D. C. heat sink and pass through openings within the opposite D. C. heat sink and the A. C. heat sinks and assist together with locking nuts in compressing the sandwiched assembly. Two of the bolts conduct direct current to the rectifiers through the two D. C. heat sinks and are electrically insulated from the A. C. heat sinks. Alternating current is connected directly to the A. C. heat sinks. The bolts utilized in the invention further secure inductance cores, provide an electrical connection to an input-output circuit, provide an electrical connection to a printed circuit board, provide a connection to a cabinet, and provide a primary circuit for current sensing transformers. The plurality of heat sinks are oriented so that the cooling fins of all layers are in parallel alignment.


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