The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 17, 1991
Filed:
Feb. 16, 1990
Malcolm T Gilliland, Marietta, GA (US);
Other;
Abstract
A pulsed welding power supply with short circuit and overcurrent protection. A switching device (55) provides output voltage and output current to the output (17, 18, 19) of a pulse welding power supply. A welding parameter selection means (30, 32, 34, 37) provides a control signal to the switching device (55) which turns the switching device (55) on or off. A short circuit detector (72) monitors the output voltage and inhibits the control signal to the switching device (55) if the output voltage drops below a predetermined value. in order to allow the pulsed welding power supply to start operation, or restart after the short is removed, a resistor (45), connected in parallel with the switching device (55), access a limited current source means which provides a limited output current to the output when the switching device (55) is disabled. If a short circuit is not present at the output then the limited current provided by the resistor (45) will be sufficient to raise the output voltage above the predetermined voltage. The short circuit detector (72 ) will then allow the control signal to enable the switching device (55). An overcurrent detector (73), in conjunction with a resistor (64), monitors the output current and disables the control signal if the output current should exceed a predetermined value. The pulsed welding power supply is therefore protected against a short circuit condition at starting, a short circuit condition during operation, and an overcurrent condition during operation.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile