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Magneto Repulsion Punch Drive Circuit Disclosure Number: IPCOM000058816D
Original Publication Date: 1988-Dec-01
Included in the Prior Art Database: 2005-Feb-15

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Long, DC Pakes, D Peters, RS [+details]


This article proposes modifying the circuitry used in disk-punch assemblies to avoid excessive current heat build up on the disk, which otherwise may lead to high failure rates of the punch head and shank. The modification avoids operating at a fixed voltage which was the contributing cause to heat build up as the punch rate was varied. In the operation of the flexible punch, which allows for variations of via patterns to be punched, a high-power-drive circuit energizes a coil each time a via is punched in a ceramic green sheet. Since the punch has to operate at the higher rate required for dense via regions, the supply voltage is normally adjusted to the highest level necessary to accommodate the higher rate.