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Circuit for providing electrical energy to a heatable means

  • US 4,845,342 A
  • Filed: 01/06/1988
  • Issued: 07/04/1989
  • Est. Priority Date: 01/06/1988
  • Status: Expired due to Term
First Claim
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1. A control circuit for variably applying time-wise A.C. power to a heating element comprising in combination:

  • first and second input lines respectively connected to first and second terminals of an electrical power source and arranged with respect to said electrical power source such that when said first input line has a positive electrical potential, said second input line has a relatively negative electrical potential and alternatively when said first input line is a relatively negative electrical potential, second input line has a positive electrical potential;

    first circuit means and second circuit means serially connected across said first and second input lines and having a first intermediate terminal located between said first circuit means and said second circuit means;

    third circuit means and heating circuit means serially connected across said first and second input lines and having a second intermediate terminal located in between said third circuit means and said heating circuit means;

    first switchable bidirectional electric current conducting means having first and second power lead means respectively connected to said first input line and to said second intermediate terminal, said first bidirectional electrical conducting means having gate means which respond to signals applied thereto to cause said first switchable bidirectional electrical current conducting means to conduct current from said second input line through said heating circuit means and therefrom in a first direction to said first input line through said first power lead means and alternatively in a second direction, through said second power lead means, to said second intermediate terminal and therefrom through said heating circuit means to said second input line;

    storage circuitry means to develop a control voltage signal, including means to vary current transmitted for storage at said storage circuitry means, said storage circuitry means connected to said gate means and connected between said second intermediate terminal and said first input line to cause different amounts of current to flow through said first switchable bidirectional electrical current conducting means in said first direction and in said second direction in response to different voltage signals being developed at said signal storage means.

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