×

Process monitor for a weld controller

  • US 6,087,613 A
  • Filed: 02/23/1998
  • Issued: 07/11/2000
  • Est. Priority Date: 02/23/1998
  • Status: Expired due to Fees
First Claim
Patent Images

1. A digital weld control system for a resistance welder supplied from an AC line voltage source comprising:

  • A. a phase reference clock for establishing a fundamental time base;

    B. a voltmeter synchronized with the fundamental time base for measuring selected parameters of the AC line voltage source;

    C. a current meter for measuring various parameters of weld load current;

    D. a firing, control synchronized with the fundamental time base;

    E. a weld sequence controller for implementing a weld program by generating weld pulse commands; and

    F. a weld process controller using the generated weld pulse commands to generate a sequence of firing commands sent to the firing control for generating firing pulses to control load current and for maintaining an internal dynamic model of load impedance calculated from the measured selected parameters of the AC line voltage source and weld load current and further including means to generate weld range events when a difference is detected between a measured load impedance and the internal dynamic model of load impedance by a prescribed amount.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×