AC-DC SHORT CIRCUIT WELDING INDICATOR
First Claim
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1. A circuit for indicating and detecting the making of electrical contact between an electrode and work-piece in series circuit relationship with a welding power supply comprising:
- an oscillator having an AC output signal of a frequency above about 1 K Hz;
a transformer having a primary and at least a first and second secondary winding, the primary of which is connected in circuit with the output of said oscillator;
said first secondary winding being connected in parallel relationship with said electrode and workpiece;
detector means connected across said second secondary winding and responsive to a predetermined output signal level; and
indicator means responsive to the output of said detector means.
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Accused Products
Abstract
A circuit for indicating the occurrence of a short circuit between an electrode and a workpiece including an oscillator; a transformer having tertiary windings, the primary winding being connected across the oscillator output, a first secondary winding connected across the electrode and workpiece, a second secondary winding connected to a signal level detector; and a lamp which is caused to light where the signal level across the second secondary winding drops below a predetermined level representing the shorted condition.
5 Citations
4 Claims
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1. A circuit for indicating and detecting the making of electrical contact between an electrode and work-piece in series circuit relationship with a welding power supply comprising:
- an oscillator having an AC output signal of a frequency above about 1 K Hz;
a transformer having a primary and at least a first and second secondary winding, the primary of which is connected in circuit with the output of said oscillator;
said first secondary winding being connected in parallel relationship with said electrode and workpiece;
detector means connected across said second secondary winding and responsive to a predetermined output signal level; and
indicator means responsive to the output of said detector means.
- an oscillator having an AC output signal of a frequency above about 1 K Hz;
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2. A circuit as defined in claim 1 wherein the frequency of the output signal of said oscillator lies in a range of above about 1 K Hz to below about 30 K Hz.
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3. A circuit as defined in claim 2 further comprising a capacitor connected in series with said first secondary winding.
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4. A circuit as defined in claim 2 further comprising a switch connected in series with said first secondary winding.
Specification
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Current AssigneeL-Tec Company (Lam Research Corporation)
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Original AssigneeTibor Endre Toth
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InventorsToth, Tibor Endre
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Primary Examiner(s)Truhe, J. V.
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Assistant Examiner(s)Peterson, Gale R.
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Application NumberUS05/224,468Time in Patent Office420 DaysField of Search219/131R,137,109,110,69G 13/12 331/65 324/51US Class Current219/130.01CPC Class CodesB23K 9/10 Other electric circuits the...
