Patent ID: 8548312
Filing Date: 2013-10-01
Classification: F24C,H01L,H05B

Abstract:
1. A rapid thermal process chamber that processes a wafer, the rapid thermal process chamber being supplied with AC power, comprising: a plurality of halogen lamps; a lamp driver comprising a parallel connection of a first diode and a first transistor with a second diode and a second transistor, the lamp driver being connected to a source of AC power and to the plurality of halogen lamps to supply power to the plurality of halogen lamps; a temperature sensor that measures a wafer temperature; and a temperature controller connected to the temperature sensor and to the lamp driver, the temperature controller providing a first control signal as a function of the wafer temperature and a desired temperature to the first transistor and a second control signal as a function of the wafer temperature and the desired temperature to the second transistor; and wherein the first transistor is turned on at different times than the second transistor.