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Large incandescent live image display system

  • US 5,712,650 A
  • Filed: 08/18/1995
  • Issued: 01/27/1998
  • Est. Priority Date: 06/22/1995
  • Status: Expired due to Fees
First Claim
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1. A high-speed control for delivering phase-delayed power to an incandescent bulb at one of a predetermined number of levels, said high speed control comprising:

  • an AC power source for providing AC power,an AC phase switch connected to said incandescent bulb and to said AC power source,a counter connected to said AC phase switch,a register connected to said counter,means for inputting into said register a delayed phase power level, said delayed phase power level corresponding to said one predetermined level,a phase signal in synchronism with the zero-crossings of said AC power for gating said delayed phase power level from said register into said counter each half cycle of said AC power, andclock pulses in synchronism with said phase signal for incrementally changing the delayed phase power level during each said half cycle in said counter until a pre-selected value is reached wherein said clock pulses in said half cycle equal said predetermined number, said counter upon reaching said pre-selected value issuing a signal to activate said AC phase switch so as to provide said phase-delayed power at said one predetermined level to said incandescent bulb during each said half cycle.

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