Programmable SCR Firing System
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsHans Lillevold, Kevin Keller, Joshua Masters, Charles Singer, Michael Goodnow
Life of this patent
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Abstract
A programmable SCR Firing system that includes modules that work together to manipulate the SCR firing circuitry so that it mimics supply load power signatures. The programmable high speed SCR firing system includes a timing module, a delay module, a zero crossing module, a single phase delay module, a firing pulse delay module, a control interface, and an user interface.
Claims9
A programmable high speed silicon controlled rectifier (SCR) firing system comprising:
- a timing module for storing a firing delay signal entered by a user, and for converting the firing delay signal such that the firing delay signal is compatible with delay circuitry;
- a delay module for transmitting and instructing firing system modules to fire after the firing delay signal is entered by the user, the delay module in communication with the timing module;
- a zero crossing module for receiving a zero crossing phased signal, the zero crossing phased signal having a positive phase with a rising edge and a negative phase with a falling edge, and for outputting indicator signals indicating when the phased signal is positive or negative and when the rising edge and the falling edge have occurred, the zero crossing module in communication with the delay module;
- a single phase delay module comprising a first delay module wired as delay circuity for the rising edge and a second delay module wired as delay circuitry for the falling edge, the single phase delay module in communication with the zero crossing module;
- a firing pulse delay module to control fired pulses from the firing system modules, the firing pulse delay module in communication with the zero crossing module;
- a control interface for receiving and routing the firing delay signal, the zero crossing signal, and the indicator signals, the control interface in communication with the delay module;
- and,
- a user interface for setting firing delay time, and for enabling and disabling the firing system modules.
A silicon controlled rectifier (SCR) firing system method comprising:
- checking SCR polarity;
- loading a timer delay when the SCR polarity changes;
- starting a SCR firing system timer when the SCR polarity changes;
- setting an output condition when a timer reaches the loaded timer delay;
- waiting a specified number of clock cycles;
- clearing the output condition when the timer reaches the timer delay within the specified number of clock cycles;
- and,
- firing the SCR when the timer does not reach the timer delay with the specified number of clock cycles.
A silicon controlled rectifier (SCR) firing method comprising:
- inputting a specified zero crossing SCR firing delay time;
- storing the specified zero crossing SCR firing delay time;
- converting the specified firing delay time to be compatible with delay circuitry;
- transmitting an instruction to fire pulses after the specified zero crossing delay time;
- receiving a zero crossing signal with a positive phase having a rising edge and negative phase having a falling edge;
- transmitting a signal indicating when the zero crossing signal is in the positive phase;
- transmitting a signal indicating when the zero crossing signal is in the negative phase;
- transmitting a signal indicating when the rising edge of the zero crossing signal has occurred;
- transmitting a signal indicating when the falling edge of the zero crossing has occurred;
- sending a signal to the SCR to fire after the specified zero crossing firing delay time is reached and after the falling edge of the zero crossing has occurred.
A method for manipulating a silicon controlled rectifier (SCR) firing system so that it mimics supply load power signatures, the method comprising:
- storing a firing delay signal entered by a user;
- converting the firing delay signal such that the firing delay signal is compatible with delay circuitry;
- transmitting and instructing firing system modules to fire after the firing delay signal is entered by the user;
- receiving a zero crossing phased signal, the zero crossing phased signal having a positive phase with a rising edge and a negative phase with a falling edge,
- outputting indicator signals indicating when the phased signal is positive or negative and when the rising edge and the falling edge have occurred;
- setting firing delay time causing firing modules to fire so that a load power signature is emitted.
Dependencies are inferred from the claim text.