| 摘要 |
PROBLEM TO BE SOLVED: To provide a temperature control system for an electrical resistance heater which satisfies a new flicker requirement. SOLUTION: The control system for reducing flicker in an electric resistance heater is provided with a source of alternating current for supplying alternating current to electrical resistance heaters 36, 38 and 40, a bidirectional solid state switching device connected between the source of alternating current and the electrical resistance heater, and a control circuit for controlling the bidirectional solid state switching device to supply a varying, phase controlled duty cycle of current to the electrical resistance heater which effectively performs power up and down in response to a binary control signal which randomly turns on the bidirectional solid state switching device.
|
