Patent ID: 9612020
Date: 2017-04-04
CPC Classifications: F24C,H01L,H05B

Claim:
1. A thermal process chamber that processes a wafer, comprising: a plurality of halogen lamps; a power source comprising an AC power source with a first switch and a second switch, the power source connected to the plurality of halogen lamps to supply power to the plurality of halogen lamps; a temperature sensor that measures a temperature of the wafer; and a temperature controller connected to the temperature sensor and to the first switch and the second switch in the power source, the temperature controller providing a first control signal to the first switch and a second control sign to the second switch, the first control signal and the second control signal being a function of the wafer temperature and a desired temperature; wherein the first control signal turns the first switch on and off a plurality of times per half cycle of the AC power and the second control signal turns the second switch on and off a plurality of times per half cycle of the AC power.