Method and apparatus for controlling power to a heater...

Details Method and apparatus for controlling power to a heater... Method and apparatus for controlling power to a heater...

2005-08-09

2005-08-09

Paschall, Mark (Department: 3742)

Electric heating

Heating devices

With power supply and voltage or current regulation or...

C219S501000, C219S505000, C219S216000, C323S901000, C399S070000

Reexamination Certificate

active

06927368

ABSTRACT:
A method for controlling power to an electrical load using dual pulse width modulation (PWM) to minimize in-rush current to the electrical load, such as a heater element. An output from a power source, supplying an alternating current, is modulated by a first PWM control signal to provide a first modulated power level to the electrical load. The first modulated power level is modulated by a second PWM control signal to control power supplied to the electrical load at the first modulated power level. The first PWM control signal operates to control the number of half cycles of current in order to provide one-third, two-thirds or full cycle power. The second PWM control signal operates to define a duty cycle and period for providing the power defined by the first PWM control signal to the electrical load.

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