US 9,812,342 B2
Reduced wire count heater array block
Cal T. Swanson, St. Louis, MO (US); and Louis P. Steinhauser, St. Louis, MO (US)
Filed by Watlow Electric Manufacturing Company, St. Louis, MO (US)
Filed on Dec. 8, 2015, as Appl. No. 14/962,733.
Prior Publication US 2017/0162407 A1, Jun. 8, 2017
Int. Cl. H05B 1/02 (2006.01); H01L 21/67 (2006.01)
CPC H01L 21/67103 (2013.01) [H01L 21/67109 (2013.01); H01L 21/67248 (2013.01); H05B 1/0233 (2013.01)] 22 Claims
OG exemplary drawing
1. A thermal system comprising:
a plurality of thermal elements, each of the thermal elements defining a resistor and a current limiting device, the plurality of thermal elements comprising at least a first subset of parallel thermal elements and at least a second subset of parallel thermal elements, wherein the current limiting devices in a given subset of parallel thermal elements have opposite polarity from each other; and
a plurality of power lines connected to the plurality of thermal elements, the power lines configured in pairs for providing power to the first subset and the second subset of parallel thermal elements,
wherein each of the pairs of power lines share a common power line such that the first and second subsets of parallel thermal elements share the common power line.