Welding Power Supply With Half Bridge
1 Assignment
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Accused Products
Abstract
A method and apparatus for providing welding-type power is disclosed. It includes an input circuit, a dc bus, an output circuit, and a control module. The input circuit receives power and provides an intermediate signal to the bus. The output circuit receives the dc bus and provides an ac welding-type output. The output circuit includes a half-bridge output inverter with at least first and second switches. The output inverter further includes an output control circuit. The output control circuit provides freewheeling paths that includes control switches, the output, antiparallel diodes. The control module has a four quadrant control module that provides control signals to the half bridge output inverter and provides modulating control signals to the first and second output control switches. The modulating signals cause the output control switches to be turned on and off multiple times to control a rate of change of output current.
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Citations
44 Claims
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1-10. -10. (canceled)
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11. A welding-type power supply, comprising:
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an input rectifier, disposed to receive input power, and to provide a rectified signal; a dc bus disposed to receive the rectified signal; an output circuit, disposed to receive the dc bus, wherein the output circuit provides an ac welding-type output across an electrode output and a work output, and includes a half-bridge inverter having at least a first switch and a second switch, wherein the half bridge inverter is connected to receive power from the dc bus and provide power to the output, and further wherein the output circuit includes a boost circuit that includes an inverter dc bus, a boost inductor, and a boost switch; and a control module including an inverter control module that provides control signals to the half bridge inverter, and further including a boost control module that provides modulating control signals to the boost switch, wherein the modulating control signals cause the boost switch and the boost inductor to operate as a boost circuit to boost a voltage on the inverter dc bus to a desired magnitude when the first switch is on and not commutating - View Dependent Claims (12)
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14. A welding-type power supply, comprising:
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an input circuit, disposed to receive input power, and to provide an intermediate signal; a dc bus disposed to receive the intermediate signal; an output circuit, disposed to receive the dc bus, wherein the output circuit provides a welding-type output across an electrode output and a work output, and includes a half-bridge inverter having at least a first switch and a second switch, wherein the half bridge inverter is connected to receive power from the dc bus and provide power to the output, and further wherein the output circuit includes an output control circuit connected to provide a first freewheeling path that includes a first control switch, the electrode output, the work output and a diode antiparallel to the first switch, and wherein the output control circuit includes a second output control switch that provides a second freewheeling path that includes the second output control switch, the electrode output, the work output and a diode antiparallel to the second switch; and a control module including an inverter control module that provides control signals to the halfbridge inverter, and further including a ramp module that provides modulating control signals to the first and second output control switches, wherein the modulating control signals cause at least one of the first and second output control switches to be turned on and off multiple times to control a rate of change of a current in the output. - View Dependent Claims (15, 16, 17, 18, 32)
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19. A welding-type power supply, comprising:
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an input circuit, disposed to receive input power, and to provide an intermediate signal; a dc bus disposed to receive the intermediate signal; an output circuit, disposed to receive the dc bus, wherein the output circuit provides a welding-type output across an electrode output and a work output, and includes and a half-bridge inverter having at least a first switch and a second switch, wherein the half bridge inverter is connected to receive power from the dc bus and to provide power to the output, and further wherein the output circuit includes an output control circuit connected to provide a first freewheeling path that includes a first output control switch, the electrode output, the work output and a diode antiparallel to the first switch, and wherein the output control circuit includes a second output control switch that provides a second freewheeling path that includes the second output control switch, the electrode output, the work output and a diode antiparallel to the second switch; and a control module including an inverter four quadrant control module that provides control signals to the halfbridge and provides modulating control signals to the first and second output control switches, wherein the modulating control signals cause at least one of the first and second output control switches to be turned on and off multiple times to control a rate of change of a current in the output.
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20. A method of providing welding-type power, comprising:
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receiving input power and providing an intermediate signal; inverting the intermediate signal by controlling a first switch and a second switch in a half bridge inverter to provide an output; and commutating current to the first switch and controlling a first rate of change of a current in the output by turning a first commutation switch on and off multiple times during commutation of the current to the first switch. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A method of providing welding-type power, comprising:
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receiving input power and providing an intermediate signal; inverting the intermediate signal by controlling a first switch and a second switch in a half bridge inverter to provide an output; controlling a first boost switch such that the first boost switch and a boost inductor operate as a boost circuit to boost a voltage of the intermediate signal to a desired magnitude when the first switch is on and not commutating. - View Dependent Claims (28)
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29. A method of providing welding-type power, comprising:
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receiving input power and providing an intermediate signal; converting the intermediate signal to an output signal by controlling at least one of a first switch and a second switch in a half bridge inverter to provide an output; controlling a rate of change of an output current by modulating a first output control switch, wherein turning the first output control switch on creates a first freewheeling path that includes the first output control switch, the output, and a diode antiparallel to the first switch; and controlling the rate of change of the output current by modulating a second output control switch, wherein turning the second output control switch on creates a second freewheeling path that includes the second output control switch, the output, and a diode antiparallel to the second switch. - View Dependent Claims (30, 31)
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33. A method of providing welding-type power, comprising:
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receiving input power and providing an intermediate signal converting the intermediate signal to an output signal by controlling at least one of a first switch and a second switch in a half bridge inverter to provide an output; modulating a first output control switch, wherein turning the first commutation switch on creates a first freewheeling path that includes the first output control switch, the output, and a diode antiparallel to the first switch; and modulating a second output control switch, wherein turning the second output control switch on creates a second freewheeling path that includes the second output control switch, the output, and a diode antiparallel to the second switch; controlling the output signal in four quadrants by controlling the turning on and off of the first switch, the second switch, the first output control switch, and the second output control switch.
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34-38. -38. (canceled)
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39. A system for providing welding-type power, comprising:
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means for receiving input power and providing an intermediate signal; means for inverting the intermediate signal by controlling a first switch and a second switch in a half bridge inverter to provide an output, wherein the means for inverting is connected to the means for receiving; means for controlling a first boost switch such that the first boost switch and a boost inductor operate as a boost circuit to boost a voltage of the intermediate signal to a desired magnitude when the first switch is on and not commutating. - View Dependent Claims (40)
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41. A system for providing welding-type power, comprising:
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means for receiving input power and for providing an intermediate signal; means for converting the intermediate signal to an output signal by controlling at least one of a first switch and a second switch in a half bridge inverter to provide an output; means for controlling a rate of change of an output current by modulating a first output control switch, wherein turning the first output control switch on creates a first freewheeling path that includes the first output control switch, the output, and a diode antiparallel to the first switch; and wherein the means for controlling is further for controlling the rate of change of the output current by modulating a second output control switch, wherein turning the second output control switch on creates a second freewheeling path that includes the second output control switch, the output, and a diode antiparallel to the second switch. - View Dependent Claims (42, 43)
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44. A system for providing welding-type power, comprising:
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means for receiving input power and for providing an intermediate signal; means for converting the intermediate signal to an output signal by controlling at least one of a first switch and a second switch in a half bridge inverter to provide an output; means for modulating a first freewheeling path that includes a first output control switch, the output, and a diode antiparallel to the first switch; and means for modulating a second freewheeling path that includes a second output control switch, the output, and a diode antiparallel to the second switch; means for controlling the output signal in four quadrants by controlling the turning on and off of the first switch, the second switch, the first output control switch, and the second output control switch.
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Specification