Device to control power source
First Claim
1. A device to control operation of a power source for an electric arc welder, said power source having a first output terminal connectable to a first welding cable and a second output terminal connectable to a second welding cable, where said cables are to be in a series circuit including a welding gap defined by an electrode and a workpiece, said device comprising:
- an oscillator driving a first winding for inducing a high frequency voltage into said series circuit, a detector tuned to said high frequency for sensing the level of current in said series circuit at said high frequency and an output circuit to create a start signal when said level exceeds a given value representing a resistance in said gap below a given amount, wherein said first winding is the primary winding of an input transformer and one of said cables is the secondary winding of said input transformer.
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Accused Products
Abstract
A device to control operation of a power source for an electric arc welder comprising an oscillator for inducing a high frequency voltage into a series circuit including the welding gap, a detector tuned to the high frequency for sensing the level of current in the series circuit at the high frequency and an output circuit to create a start signal when the received signal level exceeds a given value representing a resistance in said gap below a given amount.
11 Citations
105 Claims
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1. A device to control operation of a power source for an electric arc welder, said power source having a first output terminal connectable to a first welding cable and a second output terminal connectable to a second welding cable, where said cables are to be in a series circuit including a welding gap defined by an electrode and a workpiece, said device comprising:
- an oscillator driving a first winding for inducing a high frequency voltage into said series circuit, a detector tuned to said high frequency for sensing the level of current in said series circuit at said high frequency and an output circuit to create a start signal when said level exceeds a given value representing a resistance in said gap below a given amount, wherein said first winding is the primary winding of an input transformer and one of said cables is the secondary winding of said input transformer.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A device to control operation of a power source for an electric arc welder, said power source having a first output terminal connectable to a first welding cable and a second output terminal connectable to a second welding cable, where said cables are to be in a series circuit including a welding gap defined by an electrode and a workpiece, said device comprising:
- an oscillator driving a first winding for inducing a high frequency voltage into said series circuit, a detector tuned to said high frequency for sensing the level of current in said series circuit at said high frequency and an output circuit to create a start signal when said level exceeds a given value representing a resistance in said gap below a given amount, wherein said detector is an output transformer with a primary winding comprising one of said cables and secondary winding in a circuit tuned to said high frequency.
- View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A device to prevent operation of a power source for an electric arc welder, said power source having a first output terminal connectable to a first welding cable and a second terminal connectable to a second welding cable, where said cables are to be in a series circuit including a welding gap defined by an electrode and a workpiece, said device comprising:
- an oscillator to apply a high frequency voltage at a low current to said series circuit and a detector tuned to said high frequency to create a start signal when said high frequency voltage reaches a value indicative of a resistance across said gap being below a given amount, wherein said welder has a trigger switch closed to create a trigger signal and including an anding circuit to and said trigger signal and said start signal to output a power source enabling signal.
- View Dependent Claims (33, 34, 35, 36, 37, 38, 39)
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40. A method of enabling the starting of the power source of an electric arc welder used to weld across the gap between an electrode and a workpiece, said method comprising:
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(a) applying a high frequency voltage in a series circuit including said gap; (b) measuring the magnitude of said high frequency voltage in said series circuit; (c) receiving a trigger signal indicating closure of a trigger switch of said welder; and
,(d) enabling said power supply when said magnitude is greater than a level indicative of a resistance in said gap below a given amount and when said trigger signal indicates the trigger switch is closed. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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- 52. In an inverter type power source the improvement including a device to prevent operation of said power source when used for an electric arc welder, said power source having a first output terminal connectable to a first welding cable and a second terminal connectable to a second welding cable, where said cables are to be in a series circuit including a welding gap defined by an electrode and a workpiece, said device having an oscillator to apply a high frequency voltage to said series circuit and a detector tuned to said high frequency to create a start signal when said high frequency voltage reaches a value indicative of a resistance across said gap being below a given amount, wherein said welder has a trigger switch closed to create a trigger signal and including an anding circuit to and said trigger signal and said start signal to output a power source enabling signal.
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62. A device to control operation of a power source, said device comprising:
- an oscillator driving a primary winding of a first transformer for inducing a high frequency voltage into a secondary winding of the first transformer connected in a series circuit associated with said power source, a detector connected to a secondary winding of a second transformer and tuned to said high frequency for sensing the level of current in a primary winding of said second transformer connected in said series circuit at said high frequency and an output circuit to create a start signal when said level exceeds a given value representing an impedance in said series circuit below a given amount.
- View Dependent Claims (63, 64, 65, 66, 67, 68, 69, 70, 71)
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72. A device to control operation of a power source for an electric arc welder, said device comprising:
- an oscillator for inducing a high frequency voltage into a series circuit including the welding gap, a detector tuned to said high frequency for sensing the level of current in said series circuit at said high frequency and an output circuit to create a start signal when the received signal level exceeds a given value representing a resistance in said gap below a given amount, wherein said welder has a trigger switch closed to create a trigger signal and including an anding circuit to and said trigger signal and said start signal to output a power source enabling signal.
- View Dependent Claims (73, 74, 75, 76, 77)
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78. A device to control operation of a power source for an electric arc welder, said device comprising:
- a first transformer with a secondary winding, a second transformer with a primary winding, said windings being connected in a series circuit with the output of said welder, an oscillator for exciting said secondary winding at a fixed frequency and a detector circuit tuned to said fixed frequency and driven by the signal in said primary winding to create a start signal when the resistance of said welder output is below a given amount.
- View Dependent Claims (79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105)
Specification