A power supply system includes multiple power supply devices including a first power supply device and a second power supply device that are connected in common to a load. The first power supply device calculates control information for controlling voltage or current to be output to the load and source information for obtaining the control information, and controls the output to the load based on the calculated control information while transmitting the source information to the second power supply device. The second power supply device receives the source information transmitted from the first power supply device, calculates control information based on the received source information, and controls the output to the load while detecting current to be output from itself to the load and transmitting current information to the first power supply device.

Power transmission system (1) for power transmission of electric power (P) from a power source (2A) to a power sink (4A) which is connected to the power source (2A) via a power transfer cable (3), wherein the power source (2A) has a first pole with a first electric potential, which is connected via parallel current lines of a first conducting pair of the power transfer cable (3) to a first pole of the power sink (4A), and a second pole with a second electric potential, which is connected via further parallel current lines of a second conducting pair of the power transfer cable (3) to a second pole of the power sink (4A), wherein, during the power transmission via the current lines, a user data signal can be transmitted between the power source (2A) and the power sink (4A) via at least one conducting pair with current lines of the same electric potential, uninfluenced by the power transmission.

A method and apparatus for providing welding type power includes receiving input power and pulse width modulating a first forward converter and a second forward converter so that they operate as a pulse width modulated double forward converter to provide a welding type output. A phase relationship between the first forward converter and a second forward converter is selected from at least two available phase relationships using a controller. The controller includes a pwm module, and the pwm module includes a phase relationship module. The at least two available phase relationships are at least two of variable phase shifting, fixed phase staggering and locked in phase. The selected phase relationship is maintained over a predetermined range of outputs.

A welding-type power system that includes an engine and an electric generator driven by the engine. A power bus configured to connect a power output of the electric generator to one or more of a welding-type output, a power storage device, and a switched mode power supply. A plurality of sensors are configured to monitor a plurality of parameters associated with power demand to and from the power bus and generate a signal indicative of the power demand to and from the power bus based on the monitored plurality of parameters. A controller is configured to receive the signal from the plurality of sensors, the controller to control the engine speed in response to the signal or the power demand.

A welding system includes an engine-driven welder generator that produces welding power. A welding torch receives the welding power and applies it to a stick electrode to initiate and maintain a welding arc. A parameter of the welding power, such as voltage, is monitored, such as to determine whether spikes occur during a short time after arc initiation. Based upon the monitored parameter, the engine speed is controlled. The engine speed may be increased or maintained at an elevated level if the monitored parameter indicates that particular types of electrode are being used, such as XX10 or cellulose electrodes.

A welding-type system with a programmed controller and alert devices for alerting a user as to the impending thermal shutdown of the welding-type system.

Systems and methods are disclosed for automatically activating or deactivating a gouging torch. In particular, the disclosed systems and methods activate and/or deactivate a gouging torch based on a valve operation selection. For example, for welding power supplies and/or welding wire feeders configured to operate both wire welding processes as well as gouging, a valve can be integrated with a gouging torch, which can be adjusted to allow or arrest the flow of compressed air to the gouging torch. In response, the welding power source and/or welding wire feeder automatically changes one or more output characteristics, to switch between a wire welding process and a gouging process without requiring the operator to interact with either the welding power source or welding wire feeder.

The invention provides a double-power-supply switching control system for a welding machine and method. The welding machine double-power-supply switching control method comprises the steps of: continuously detecting and modifying an input voltage signal by a signal modification unit; under the control of a control unit, judging, by a judgment unit, whether to perform voltage doubling, controlling to execute voltage doubling switching action, and locking an actual input voltage mode of a welding machine by a locking unit; and finally outputting matched output current by a power supply output unit.

A TIG-type method for tack welding two metal sheets or parts, such as tubes. The method includes, for each zone/point of tack welding of the metal sheets or of the tubes, a tack welding cycle including successively applying at least one smooth or pulsed direct current DC, and then at least one smooth or pulsed alternating current AC.

Methods and apparatus to synergically control a welding-type output during a welding-type operation are disclosed. An example welding-type power supply includes a power conversion circuit configured to convert input power to welding-type power and to output the welding-type power to a welding-type torch; a communication circuit configured to receive a control signal from a remote-control device during a welding-type operation; and a control circuit configured to synergically control at least two of a voltage of the welding-type power output by the power conversion circuitry, a current of the welding-type power, or a wire feed speed.